Rotating electrical machine device, compressor, refrigeration device, vehicle

Abstract

To reduce the variation of the magnetization state between first field magnets.SOLUTION: An armature winding (40) generates a rotary magnetic field that rotates a rotor (10) when an armature current (i40) is supplied. A field winding (50) generates a field magnetic flux (M50) when a field current (i50) is supplied. A first field magnet (70) can change a magnetic force of the same by the field magnetic flux (M50). A control unit (3) controls the field current (i50) so that the magnetic force of the first field magnet (70) is changed by the field magnetic flux (M50) during rotation of the rotor (10) in controlling the magnetic force to change the magnetic force of the first field magnet (70) by the field magnetic flux (M50).SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a rotating electrical machine device, a compressor, a refrigeration device, and a vehicle.

Background Art

[0002] Among electric motors, which are a type of rotating electrical machine, there is an electric motor called a hybrid excitation flux switching motor (HEFSM). For example, the HEFSM disclosed in Patent Document 1 includes a stator core in which a field slot and an armature slot are formed, a rotor core facing the stator core with a predetermined air gap, a field winding accommodated in the field slot, an armature winding accommodated in the armature slot, and a permanent magnet accommodated in the field slot.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in Patent Document 1, how to magnetize the permanent magnet is not discussed.

Means for Solving the Problems

[0005] A first aspect of the present disclosure relates to a rotating electrical machine device, the rotating electrical machine device comprising a rotating electrical machine (2) having a rotor (10) and a stator (20) facing the rotor (10) with a predetermined gap (G) therebetween, and a control unit (3). The stator (20) includes a stator core (30) provided with armature slots (35a) and field slots (35b) arranged alternately in the circumferential direction, an armature winding (40) accommodated in the armature slots (35a), and a field winding (50) and a first field magnet (70) accommodated in the field slots (35b). The armature winding (40) generates a rotating magnetic field that rotates the rotor (10) when an alternating armature current (i40) is supplied. The field winding (50) generates a field magnetic flux (M50) when a direct current field current (i50) is supplied. The first field magnet (70) can change its magnetic force by the field magnetic flux (M50). The control unit (3) controls the field current (i50) so that the magnetic force of the first field magnet (70) is changed by the field magnetic flux (M50) during rotation of the rotor (10) in magnetic force control for changing the magnetic force of the first field magnet (70) by the field magnetic flux (M50).

[0006] In the first aspect, variations in the magnetization state between the first field magnets (70) can be reduced.

[0007] A second aspect of the present disclosure is the rotating electrical machine device according to the first aspect, wherein the control unit (3) controls the field current (i50) so that the magnetic force of the first field magnet (70) is changed by the field magnetic flux (M50) during a period in which the electrical angle of the rotor (10) changes by 180° or more in the magnetic force control.

[0008] In the second aspect, due to the magnetic symmetry between the rotor (10) and the stator (20), in principle, variations in the magnetization state between the first field magnets (70) can be reduced.

[0009] A third aspect of the present disclosure is a rotating electrical machine device according to the second aspect, wherein, in the magnetic force control, the control unit (3) controls the field current (i50) so that the magnetic force of the first field magnet (70) is changed by the field magnetic flux (M50) during a period in which the electrical angle of the rotor (10) changes by 360° or more.

[0010] In the third aspect, even when the magnetic symmetry between the rotor (10) and the stator (20) is broken by the rotating magnetic field, variations in the magnetization state among the first field magnets (70) can be reduced.

[0011] A fourth aspect of the present disclosure is a rotating electrical machine device according to any one of the first to third aspects, wherein, in the magnetic force control, the control unit (3) controls the armature current (i40) and the field current (i50) so that the magnetic force of the first field magnet (70) is changed by the field magnetic flux (M50) during a period in which the armature current (i40) is supplied to the armature winding (40).

[0012] In the fourth aspect, by supplying the armature current (i40) to the armature winding (40) in the magnetic force control, the rotation of the rotor (10) can be maintained (continued) in the magnetic force control.

[0013] A fifth aspect of the present disclosure is a rotating electrical machine device according to any one of the first to fourth aspects, wherein, in the magnetic force control, the control unit (3) controls the field current (i50) so that the magnitude of the magnetic force of the first field magnet (70) is changed while the direction of the magnetic force of the first field magnet (70) is maintained.

[0014] In the fifth aspect, the field current (i50) required to change the magnetic force of the first field magnet (70) can be reduced as compared with the case where the field current (i50) is controlled so that the direction of the magnetic force of the first field magnet (70) is changed.

[0015] A sixth aspect of the present disclosure is a rotating electrical machine device according to any one of the first to fifth aspects, wherein the control unit (3) changes the armature current (i40) in a direction to suppress torque fluctuations caused by the field magnetic flux (M50) in the field control.

[0016] In the sixth aspect, torque fluctuations caused by the field magnetic flux (M50) can be suppressed in the field control.

[0017] A seventh aspect of the present disclosure is a rotating electrical machine device according to any one of the first to sixth aspects, wherein the first field magnet (70) is disposed on a side farther from the rotor (10) than the field winding (50) within the field slot (35b).

[0018] In the seventh aspect, changes in the magnetic force of the first field magnet (70) due to the field magnetic flux (M50) can be facilitated more than when the first field magnet (70) is disposed closer to the rotor (10) than the field winding (50).

[0019] An eighth aspect of the present disclosure is a rotating electrical machine device according to any one of the first to seventh aspects, wherein the stator (20) has a second field magnet (60) housed in the field slot (35b).

[0020] In the eighth aspect, even when the magnetic force of the first field magnet (70) is substantially zero, a magnet magnetic flux (M60) in a certain direction can be provided by the second field magnet (60).

[0021] A ninth aspect of the present disclosure is a rotary electric machine device according to the seventh aspect, wherein in the magnetic force control, the control unit (3) causes a pulsed field current (i50) to flow during rotation of the rotor (10) in a first period in which the electrical angle of the rotor (10) is within a first range including 0°, a second period in which the electrical angle is within a second range including 120°, and a third period in which the electrical angle is within a third range including 240°, so as to change the magnetic force of the first field magnet (70) by the field magnetic flux (M50), and controls the field current (i50).

[0022] In the ninth aspect, the magnetic force of the first field magnet (70) can be efficiently changed.

[0023] A tenth aspect of the present disclosure is a rotary electric machine device according to the ninth aspect, wherein when the rotation speed of the rotor (10) is lower than a threshold value, the control unit (3) causes a pulsed field current (i50) to flow during rotation of the rotor (10) in the first period, the second period, and the third period in the magnetic force control, so as to change the magnetic force of the first field magnet (70) by the field magnetic flux (M50), and controls the field current (i50), and when the rotation speed of the rotor (10) is not lower than the threshold value, in the magnetic force control, the field current (i50) is controlled so that the magnetic force of the first field magnet (70) is changed by the field magnetic flux (M50) during rotation of the rotor (10).

[0024] In the tenth aspect, the magnetic force control can be appropriately performed according to the rotation speed of the rotor (10).

[0025] An eleventh aspect of the present disclosure relates to a compressor, and this compressor includes any one of the rotary electric machine devices according to the first to tenth aspects.

[0026] A twelfth aspect of the present disclosure relates to a refrigeration device, and this refrigeration device includes the compressor according to the eleventh aspect.

[0027] The 13th aspect of the present disclosure relates to a vehicle, which includes a rotary electric machine device according to any one of the 1st to 10th aspects.

Brief Description of the Drawings

[0028]

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DETAILED DESCRIPTION OF THE INVENTION

[0029] Hereinafter, embodiments will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and their description will not be repeated.

[0030] (Embodiment 1) FIG. 1 illustrates the configuration of the rotary electric machine device (1) according to Embodiment 1. This rotary electric machine device (1) includes a rotary electric machine (2), a control unit (3), and a shaft (4). In this example, the rotary electric machine (2) constitutes an inner rotor type electric motor. Specifically, the rotary electric machine (2) constitutes a hybrid excitation flux switching motor (HEFSM). For example, the rotary electric machine (2) that constitutes the electric motor can be used in an automobile, an air conditioner, etc., and drives a transmission of an automobile, a compressor of an air conditioner, etc. by a shaft (4) connected to a rotor (10) described later.

[0031] In the following description, the "axial direction" refers to the direction of the rotation center axis (P) of the rotor (10), specifically, the direction of the axis of the shaft (4) described later. The "radial direction" refers to the direction orthogonal to the axial direction, and the "circumferential direction" refers to the direction along the rotation direction of the rotor (10). The "radial outside" refers to the side farther from the rotation center axis (P), and the "radial inside" refers to the side closer to the rotation center axis (P). The "cross section" refers to a cross section orthogonal to the axial direction.

[0032] 〔Rotary Electric Machine〕 The rotary electric machine (2) includes a rotor (10) and a stator (20), and is housed in a casing (not shown). The stator (20) faces the rotor (10) with a predetermined gap (G) therebetween.

[0033] 〔Rotor〕 The rotor (10) has a rotor core (11). The rotor core (11) is made of a soft magnetic material. For example, the rotor core (11) is composed of a laminated core in which a large number of core members punched out by press working an electromagnetic steel sheet are laminated in the axial direction.

[0034] In this example, the rotor core (11) is formed in a gear shape when viewed from the axial direction. Specifically, the rotor core (11) has a rotor yoke (12) and a plurality of protrusions (13). In the example of FIG. 1, ten protrusions (13) are provided on the rotor core (11). The rotor yoke (12) is formed in a cylindrical shape. The plurality of protrusions (13) protrude radially outward from the rotor yoke (12). Further, the plurality of protrusions (13) are arranged at equal pitches in the circumferential direction and face the stator (20) with a slight gap (G) therebetween. A through hole (15) is provided at the center of the rotor yoke (12). A shaft (4) is inserted into and fixed to the through hole (15).

[0035] Note that the plurality of protrusions (13) are provided to vary the magnetoresistance according to the relative position of the rotor (10) with respect to the stator (20). Therefore, the plurality of protrusions (13) do not necessarily have to be arranged at exactly equal pitches. Also, the shape of the rotor (10) when viewed from the axial direction may be other shapes than the gear shape. For example, by providing a thin rotor core (not shown) in the recess formed between the protrusions (13) of the rotor core (11), the shape of the rotor (10) may be made circular.

[0036] 〔Stator〕 The stator (20) has a stator core (30), a plurality of armature windings (40), a plurality of field windings (50), a plurality of first field magnets (70), and a plurality of second field magnets (60). In the example of FIG. 1, twelve armature windings (40), twelve field windings (50), twelve first field magnets (70), and twelve second field magnets (60) are provided on the stator core (30).

[0037] 〈Stator Core〉 The stator core (30) is made of a soft magnetic material and is formed in a substantially annular shape. For example, the stator core (30) is composed of a laminated core in which a large number of core members punched out from an electromagnetic steel sheet by press working are laminated in the axial direction.

[0038] The stator core (30) has a stator yoke (31) and a plurality of teeth (32). In the example of FIG. 1, 24 teeth (32) are provided on the stator core (30). The stator yoke (31) is formed in an annular shape and constitutes the outer peripheral portion of the stator core (30). The plurality of teeth (32) project radially inward from the inner peripheral surface of the stator yoke (31). Further, the plurality of teeth (32) are arranged at equal pitches in the circumferential direction around the rotation center axis (P). As a result, a plurality of slots (35) are formed between the plurality of teeth (32).

[0039] The plurality of slots (35) respectively formed between the plurality of teeth (32) are roughly classified into armature slots (35a) and field slots (35b). Specifically, the armature slots (35a) are the slots (35) that are adjacent to each other with one slot skipped in the circumferential direction among the plurality of slots (35), and the field slots (35b) are the slots (35) excluding the field slots (35b) among the plurality of slots (35). In other words, in the stator core (30), the armature slots (35a) and the field slots (35b) are arranged alternately in the circumferential direction.

[0040] In the example of FIG. 1, 24 slots (35) are provided on the stator core (30). Among the 24 slots (35), 12 slots (35) that are adjacent to each other with one slot skipped in the circumferential direction constitute 12 armature slots (35a), and the remaining 12 slots (35) constitute 12 field slots (35b).

[0041] In the following description, when paying attention to a specific component among a plurality of components such as the teeth (32), the armature slots (35a), and the field slots (35b), a branch number is attached to the reference numeral of that component. For example, the reference numeral of a certain specific tooth (32) is denoted as "32-1".

[0042] 〈Armature winding〉 The plurality of armature windings (40) have the same configuration as each other. The armature winding (40) is accommodated in the armature slot (35a). Then, the armature winding (40) is supplied with an alternating armature current (i40) to generate a rotating magnetic field for rotating the rotor (10). For example, the armature winding (40) is a three-phase armature winding, and the armature current (i40) supplied to the armature winding (40) is a three-phase alternating current.

[0043] In this example, the plurality of armature windings (40) are accommodated in a plurality of armature slots (35a) and wound around a plurality of teeth (32). Specifically, one armature winding (40) is wound around a pair of teeth (32) (hereinafter referred to as "a pair of armature teeth (32a)") sandwiched between a pair of adjacent armature slots (35a) in the circumferential direction. In other words, a pair of armature teeth (32a) is regarded as one tooth, and one armature winding (40) is wound around it in a concentrated winding manner. Specifically, the armature winding (40) is wound around a pair of armature teeth (32a) with an axis along the radial direction as the winding axis.

[0044] Specifically explaining with reference to FIG. 1, the armature winding (40-1) is wound around a pair of armature teeth (32a) constituted by two teeth (32-1, 32-2) sandwiched between two adjacent armature slots (35a-1, 35a-2) in the circumferential direction.

[0045] 〈Field winding〉 The plurality of field windings (50) have the same configuration as each other. The field winding (50) is accommodated in the field slot (35b). Then, the field winding (50) is supplied with a direct current field current (i50) to generate a field magnetic flux (M50).

[0046] In this example, the plurality of field windings (50) are accommodated in the plurality of field slots (35b) and wound around the plurality of teeth (32). Specifically, one field winding (50) is wound around a pair of teeth (32) (hereinafter referred to as "a pair of field teeth (32b)") sandwiched between a pair of adjacent field slots (35b) in the circumferential direction. In other words, a pair of field teeth (32b) is regarded as one tooth, and one field winding (50) is wound around this tooth in a concentrated winding manner. Specifically, the field winding (50) is wound around a pair of field teeth (32b) with an axis along the radial direction as the winding axis.

[0047] Specifically, with reference to FIG. 1, the field winding (50-1) is wound around a pair of field teeth (32b) formed by two teeth (32-2, 32-3) sandwiched between two adjacent field slots (35b-1, 35b-2) in the circumferential direction.

[0048] In this example, the plurality of field windings (50) are connected in series or in parallel so that a common field current (i50) flows through the plurality of field windings (50). And the plurality of field windings (50) are wound around a plurality of pairs of field teeth (32b) such that the winding directions of two adjacent field windings (50) in the circumferential direction are opposite to each other.

[0049] 〈Magnetic Flux of Field Winding: Field Magnetic Flux〉 Note that the field magnetic flux (M50) generated around the field winding (50) accommodated in the field slot (35b) includes a magnetic flux circulating in the stator core (30) and a magnetic flux linking with the rotor core (11). In the following description, the magnetic flux circulating in the stator core (30) among the field magnetic fluxes (M50) is referred to as "short-circuit magnetic flux (M51)", and the magnetic flux linking with the rotor core (11) among the field magnetic fluxes (M50) is referred to as "linking magnetic flux (M52)". The short-circuit magnetic flux (M51) passes through the first field magnet (70). The linking magnetic flux (M52) passes through the rotor core (11). The short-circuit magnetic flux (M51) is used for magnetizing the first field magnet (70). The linking magnetic flux (M52) contributes to improving the rotational torque of the rotor (10).

[0050] <First-stage magnet> The plurality of first-stage magnets (70) have the same configuration as each other. The first-stage magnet (70) is accommodated in the field slot (35b). In this example, the first-stage magnet (70) has a rectangular cross-section and a constant circumferential length from the radially inner side to the radially outer side. The axial length of the first-stage magnet (70) is substantially the same as the axial length of the stator core (30).

[0051] The first-stage magnet (70) is magnetically arranged in parallel with the second-stage magnet (60) corresponding to the first-stage magnet (70). With such a configuration, the flow direction of the magnetic flux of the first-stage magnet (70) can be made the same as or opposite to the flow direction of the magnetic flux of the second-stage magnet (60).

[0052] Also, the first-stage magnet (70) can have its magnetic force changed by the field magnetic flux (M50) of the field winding (50) corresponding to the first-stage magnet (70). Specifically, the first-stage magnet (70) has its magnetization amount and direction changed by the field magnetic flux (M50) of the field winding (50), and the magnetic force can be changed by this change. In this example, the short-circuit magnetic flux (M51) of the field winding (50) in the field slot (35b) passes through the first-stage magnet (70) in that field slot (35b). And the first-stage magnet (70) can change the magnitude and direction of the magnetic force by the short-circuit magnetic flux (M51) passing through the first-stage magnet (70). In other words, the first-stage magnet (70) can change the magnetization state, that is, the magnitude and direction of magnetization, after removing the short-circuit magnetic flux (M51) by the short-circuit magnetic flux (M51) passing through the first-stage magnet (70). Generally, increasing or maximizing the magnitude of magnetization is called "magnetization", and decreasing the magnitude of magnetization or making the magnetization almost zero is called "demagnetization".

[0053] In this example, the first field magnet (70) is arranged radially outside the second field magnet (60). And the first field magnet (70) is magnetized so that the magnetic pole faces face in the circumferential direction. In other words, the first field magnet (70) can be magnetized in the circumferential direction, and the magnetization direction can be along the circumferential direction. Also, in this example, the plurality of first field magnets (70) are magnetized so that the magnetic pole faces with the same polarity face each other in the circumferential direction. In other words, the plurality of first field magnets (70) are magnetized such that their respective magnetization directions are along the circumferential direction, and the magnetic pole faces with different polarities face alternately toward one side in the circumferential direction.

[0054] 〈Magnetic Flux of the First Field Magnet: First Magnet Magnetic Flux〉 Note that the magnetic flux of the first field magnet (70) includes the magnetic flux circulating in the stator core (30) and the magnetic flux linking with the rotor core (11). In the following description, the magnetic flux of the first field magnet (70) is described as the "first magnet magnetic flux (M70)", the magnetic flux circulating in the stator core (30) among the first magnet magnetic flux (M70) is described as the "first short-circuit magnetic flux (M71)", and the magnetic flux linking with the rotor core (11) among the first magnet magnetic flux (M70) is described as the "first linking magnetic flux (M72)".

[0055] 〈Second Field Magnet〉 The plurality of second field magnets (60) have the same configuration as each other. The second field magnet (60) is accommodated in the field slot (35b). In this example, the second field magnet (60) has a trapezoidal cross-section, and the circumferential length gradually increases from the radially inner side to the radially outer side. The axial length of the second field magnet (60) is substantially the same as the axial length of the stator core (30). Note that the shape of the cross-section of the second field magnet (60) is not limited to a trapezoid.

[0056] Further, the second field magnet (60) has a magnetic pole face facing the circumferential direction. In other words, the second field magnet (60) is magnetized in the circumferential direction, and the magnetization direction is along the circumferential direction. In this example, a plurality of second field magnets (60) are respectively arranged in a plurality of field slots (35b) such that magnetic pole faces of the same polarity face each other in the circumferential direction. In other words, the plurality of second field magnets (60) are magnetized such that their respective magnetization directions are along the circumferential direction, and are arranged with magnetic pole faces of different polarities facing alternately toward one side in the circumferential direction.

[0057] 〈Magnetic Flux of Second Field Magnet: Second Magnet Magnetic Flux〉 Note that the magnetic flux of the second field magnet (60) includes the magnetic flux circulating in the stator core (30) and the magnetic flux linking with the rotor core (11). In the following description, the magnetic flux of the second field magnet (60) is described as "second magnet magnetic flux (M60)", the magnetic flux circulating in the stator core (30) among the second magnet magnetic flux (M60) is described as "second short-circuit magnetic flux (M61)", and the magnetic flux linking with the rotor core (11) among the second magnet magnetic flux (M60) is described as "second linking magnetic flux (M62)".

[0058] 〈Forward Direction and Reverse Direction〉 In the following description, the magnetization direction of the first field magnet (70) when the flow direction of the first linking magnetic flux (M72) of the first field magnet (70) is the same as the flow direction of the second linking magnetic flux (M62) of the second field magnet (60) corresponding to the first field magnet (70) is described as the "forward direction". Also, the magnetization direction of the first field magnet (70) when the flow direction of the first linking magnetic flux (M72) of the first field magnet (70) is the reverse direction of the flow direction of the second linking magnetic flux (M62) of the second field magnet (60) corresponding to the first field magnet (70) is described as the "reverse direction". Note that the "second field magnet (60) corresponding to the first field magnet (70)" refers to the second field magnet (60) accommodated in the common field slot (35b) together with the first field magnet (70).

[0059] 〈Magnetized State and Demagnetized State〉 In addition, the first field magnet (70) can be switched between a magnetized state and a demagnetized state by changing the magnetic force with the field magnetic flux (M50). The magnetized state is a state having an effective magnetic force. The demagnetized state is a state where the magnetic force is substantially zero. For example, in the magnetized state, the first interlinkage magnetic flux (M72) of the first field magnet (70) interlinks with the rotor core (11), and in the demagnetized state, the first interlinkage magnetic flux (M72) of the first field magnet (70) does not interlink with the rotor core (11). Note that the magnetized state includes a first magnetized state in which the direction (magnetization direction) of the magnetic force of the first field magnet (70) is in the forward direction and a second magnetized state in which the direction (magnetization direction) of the magnetic force of the first field magnet (70) is in the reverse direction.

[0060] 〔Magnetic Characteristics of Field Magnet〕 The second field magnet (60) is configured so that a change in the magnetic force due to the field magnetic flux (M50) of the field winding (50) does not occur as much as possible. The first field magnet (70) is configured so that the magnetic force changes due to the field magnetic flux (M50) of the field winding (50).

[0061] In this example, within the operating temperature range of the rotary electric machine (2), the maximum value of the coercive force of the first field magnet (70) is smaller than the minimum value of the coercive force of the second field magnet (60). For example, the upper limit of the operating temperature range of the rotary electric machine (2) is any one of 100°C, 150°C, and 200°C, and the lower limit of the operating temperature range of the rotary electric machine (2) is any one of 0°C and -50°C.

[0062] Also, the product of the "residual magnetic flux density of the second field magnet (60)" and the "magnetic pole area of the second field magnet (60)" may be larger than the product of the "residual magnetic flux density of the first field magnet (70)" and the "magnetic pole area of the first field magnet (70)".

[0063] Note that the second field magnet (60) is a magnet in which substantially no irreversible magnetic force change occurs when a field current (i50) flows through the field winding (50). The second field magnet (60) includes those in which a slight irreversible magnetic force change occurs unintentionally during operation. In other words, the second field magnet (60) is a magnet in which an irreversible magnetic force change is relatively unlikely to occur when a field current (i50) flows through the field winding (50). Specifically, the second field magnet (60) is a magnet in which an irreversible magnetic force change is less likely to occur than the first field magnet (70) when a field current (i50) flows through the field winding (50). Further, the second field magnet (60) is a magnet used with a constant magnetization direction. For example, it is desirable that the second field magnet (60) be a magnet used with a change in magnetization rate of 5% or less.

[0064] Also, the first field magnet (70) is a magnet in which an irreversible magnetic force change occurs when a field current (i50) flows through the field winding (50). In other words, the first field magnet (70) is a magnet in which an irreversible magnetic force change is relatively likely to occur when a field current (i50) flows through the field winding (50). Further, the first field magnet (70) may be a magnet used with a change in magnetization direction. Also, the first field magnet (70) may be a magnet having a coercive force at room temperature (e.g., 25°C) of 1 / 2 or less of that of the second field magnet (60). For example, the first field magnet (70) is a magnet used with a change in magnetization rate of generally 30% or more (desirably 50% or more).

[0065] 〔Configuration within Field Slot〕 FIG. 2 illustrates the configuration within the field slot (35b) in Embodiment 1. The field slot (35b) includes a winding accommodating portion (350) that accommodates the field winding (50), a second magnet accommodating portion (351) that accommodates the second field magnet (60), and a first magnet accommodating portion (352) that accommodates the first field magnet (70).

[0066] In Embodiment 1, the first magnet accommodating portion (352) is arranged radially outside the second magnet accommodating portion (351), and the winding accommodating portion (350) is arranged radially outside the second magnet accommodating portion (351). With such a configuration, in Embodiment 1, the first field magnet (70) is arranged radially outside the second field magnet (60) within the field slot (35b), and the field winding (50) is arranged radially outside the first field magnet (70) within the field slot (35b).

[0067] Also, in Embodiment 1, the circumferential length (LC70) of the first field magnet (70) is equal to or less than the circumferential length (LC60) of the radially outer portion of the second field magnet (60), and is equal to or less than the circumferential length (LC350) of the radially inner portion of the winding accommodating portion (350) of the field slot (35b).

[0068] In the example of FIG. 2, the first magnet accommodating portion (352) communicates with the second magnet accommodating portion (351), and the winding accommodating portion (350) communicates with the second magnet accommodating portion (351). The first field magnet (70) is adjacent to the radially outer side of the second field magnet (60), and the field winding (50) is adjacent to the radially outer side of the first field magnet (70). The circumferential length (LC70) of the first field magnet (70) is the same as the circumferential length (LC60) of the radially outer portion of the second field magnet (60), and is shorter than the circumferential length (LC350) of the radially inner portion of the winding accommodating portion (350). The radial length (LR70) of the first field magnet (70) is shorter than the circumferential length (LC70) of the first field magnet (70). Further, the radial length (LR70) of the first field magnet (70) is shorter than each of the radial length (LR60) of the second field magnet (60) and the radial length (LR350) of the winding accommodating portion (350). Thereby, in particular, since the first field magnet (70) has no corner protruding from the stator core (30), it is possible to avoid the application of a strong demagnetizing field due to fringing magnetic flux or the like, and demagnetization can be prevented when operating without changing the magnetic force.

[0069] Also, in the example of FIG. 2, the second boundary magnet (60) faces the rotor core (11) with a predetermined gap (G) therebetween. Therefore, a strong demagnetizing field is likely to be applied to the second boundary magnet (60) due to fringing magnetic flux or the like. Thus, it is desirable to increase the coercivity of the second boundary magnet (60). For example, the second boundary magnet (60) may be a magnet using a rare earth element (so-called rare earth magnet). Specifically, the second boundary magnet (60) is preferably a rare earth magnet mainly composed of neodymium, iron, and boron (neodymium-iron-boron-based magnet). Also, the second boundary magnet (60) is preferably a sintered magnet. Note that the second boundary magnet (60) may be a bonded magnet. The first boundary magnet (70) may be a neodymium-iron-boron-based magnet, similar to the second boundary magnet (60). Also, the first boundary magnet (70) may be an alnico magnet, a samarium cobalt magnet, or a ferrite-based magnet.

[0070] 〔Control Unit〕 As shown in FIG. 1, the control unit (3) supplies an armature current (i40) to the armature winding (40) and a field current (i50) to the field winding (50). Then, the control unit (3) controls the operation of the rotating electrical machine (2) by controlling the armature current (i40) and the field current (i50). In this example, the control unit (3) includes a power source (81) and a control circuit (82).

[0071] 〈Power Source〉 The power source (81) includes an armature power source unit (81a) and a field power source unit (81b).

[0072] The armature power source unit (81a) is electrically connected to a plurality of armature windings (40). Then, the armature power source unit (81a) supplies an alternating armature current (i40) to the plurality of armature windings (40) in response to control by the control circuit (82). A well-known power source configuration can be adopted for the configuration of the armature power source unit (81a). For example, the armature power source unit (81a) may be configured by an inverter.

[0073] The field power supply unit (81b) is electrically connected to a plurality of field windings (50). Then, the field power supply unit (81b) supplies a direct current field current (i50) to the plurality of field windings (50) in response to the control by the control circuit (82). For the configuration of the field power supply unit (81b), a well-known power supply configuration can be adopted. For example, the field power supply unit (81b) may be configured by an inverter. Note that the field current (i50) supplied during magnetization / demagnetization of the first field magnet (70) may be a pulsed direct current with an extremely short flowing time.

[0074] 〈Control Circuit〉 The control circuit (82) controls the operation of the rotating electrical machine (2) by controlling the power supply (81). Specifically, the control circuit (82) controls the power supply (81) based on the outputs of various sensors (not shown) that detect various parameters of the rotating electrical machine (2) so that the rotating electrical machine (2) performs a desired operation. For example, the control circuit (82) is composed of a processor and a memory that is electrically connected to the processor and stores programs and information for operating the processor.

[0075] 〔Operation of the Control Unit〕 The control unit (3) of Embodiment 1 selectively performs first magnetic force control, second magnetic force control, first rotation control, second rotation control, third rotation control, fourth rotation control, fifth rotation control, and sixth rotation control.

[0076] In the following description, three armature slots (35a) arranged in the circumferential direction are described as "armature slot (35a-1)", "armature slot (35a-2)", and "armature slot (35a-3)". The first field slot (35b) arranged between the first and second armature slots (35a-1, 35a-2) is described as "field slot (35b-1)". The second field slot (35b) arranged between the second and third armature slots (35a-2, 35a-3) is described as "field slot (35b-2)".

[0077] Also, the first tooth (32) sandwiched between the first armature slot (35a-1) and the first field slot (35b-1) is described as "tooth (32-1)". The second tooth (32) sandwiched between the first field slot (35b-1) and the second armature slot (35a-2) is described as "tooth (32-2)". The third tooth (32) sandwiched between the second armature slot (35a-2) and the second field slot (35b-2) is described as "tooth (32-3)". The fourth tooth (32) sandwiched between the second field slot (35b-2) and the third armature slot (35a-3) is described as "tooth (32-4)".

[0078] Also, the first field magnet (70) and the second field magnet (60) accommodated in the first field slot (35b-1) are described as "first field magnet (70-1)" and "second field magnet (60-1)". The first field magnet (70) and the second field magnet (60) accommodated in the second field slot (35b-2) are described as "first field magnet (70-2)" and "second field magnet (60-2)".

[0079] [First Magnetic Force Control] FIG. 3 illustrates the flow of magnetic flux in the first magnetic force control of Embodiment 1.

[0080] In the first magnetic force control, the control unit (3) supplies a field current (i50) to a plurality of field windings (50). Then, in each of the plurality of field slots (35b), the control unit (3) controls the field current (i50) supplied to the plurality of field windings (50) so that the short-circuit magnetic flux (M51) of the field winding (50) in that field slot (35b) passes through the first field magnet (70) in that field slot (35b) in the forward direction. As a result, in each of the plurality of field slots (35b), the first field magnet (70) is magnetized in the forward direction.

[0081] Note that in this example, the field current (i50) supplied to the field winding (50) in the first magnetic force control is a quasi-impulse current with an extremely short flowing time (for example, less than 10 msec). Also, the absolute value of the field current (i50) supplied to the field winding (50) in the first magnetic force control is larger than the absolute value of the field current (i50) supplied to the field winding (50) in the rotation control described later (specifically, the second, fourth, and sixth rotation controls). For example, the absolute value of the field current (i50) in the first magnetic force control is about 1.5 to 10 times the maximum value of the field current (i50) in the rotation control.

[0082] Also, in the first magnetic force control, the control unit (3) supplies the armature current (i40) to the plurality of armature windings (40) as necessary.

[0083] The details of the magnetic flux in the first magnetic force control are as follows.

[0084] 〈Magnetic Flux of Field Winding: Short-Circuit Magnetic Flux〉 In the first magnetic force control, the short-circuit magnetic flux (M51) of the field winding (50) in the field slot (35b-1) passes through the stator yoke (31), the teeth (32-2), the first field magnet (70-1), and the teeth (32-1) in this order, and returns to the stator yoke (31). In this way, the short-circuit magnetic flux (M51) of the field winding (50) in the field slot (35b-1) circulates in the clockwise direction around the field winding (50) in the field slot (35b-1). Note that the flowing direction of the short-circuit magnetic flux (M51) of the field winding (50) in the field slot (35b-2) is the reverse direction of the flowing direction of the short-circuit magnetic flux (M51) of the field winding (50) in the field slot (35b-1).

[0085] 〈Magnetic Flux of Field Winding: Linked Magnetic Flux〉 In the first magnetic force control, the magnetic flux linkage (M52) of the field winding (50) in the field slot (35b-1) passes through the stator yoke (31), the tooth (32-3), the rotor core (11), and the tooth (32-1) in sequence, and returns to the stator yoke (31). In this way, the magnetic flux linkage (M52) of the field winding (50) in the field slot (35b-1) circulates clockwise around the stator core (30) and the rotor core (11). Note that the flow direction of the magnetic flux linkage (M52) of the field winding (50) in the field slot (35b-2) is opposite to the flow direction of the magnetic flux linkage (M52) of the field winding (50) in the field slot (35b-1).

[0086] 〈Magnetic Flux of the Second Field Magnet: Second Short-Circuit Magnetic Flux〉 In the first magnetic force control, the second short-circuit magnetic flux (M61) of the second field magnet (60-1) passes through the tooth (32-1), the first field magnet (70-1), and the tooth (32-2) in sequence from the second field magnet (60-1), and returns to the second field magnet (60-1). In this way, the second short-circuit magnetic flux (M61) of the second field magnet (60-1) circulates clockwise around the second field magnet (60-1) and the first field magnet (70-1). Note that the flow direction of the second short-circuit magnetic flux (M61) of the second field magnet (60-2) is opposite to the flow direction of the second short-circuit magnetic flux (M61) of the second field magnet (60-1).

[0087] 〈Magnetic Flux of the Second Field Magnet: Second Magnetic Flux Linkage〉 In the first magnetic force control, the second magnetic flux linkage (M62) of the second field magnet (60-1) passes through the tooth (32-1), the rotor core (11), the tooth (32-3), the stator yoke (31), and the tooth (32-2) in sequence from the second field magnet (60-1), and returns to the second field magnet (60-1). In this way, the second magnetic flux linkage (M62) of the second field magnet (60-1) circulates counterclockwise around the stator core (30) and the rotor core (11). Note that the flow direction of the second magnetic flux linkage (M62) of the second field magnet (60-2) is opposite to the flow direction of the second magnetic flux linkage (M62) of the second field magnet (60-1).

[0088] 〈Effect of the First Magnetic Force Control〉 As described above, by performing the first magnetic force control, the magnitude and direction of the magnetic force of the first field magnet (70) can be changed so that the magnetic force of the first field magnet (70) becomes stronger in the forward direction. Specifically, when the state of the first field magnet (70) is the "first magnetized state in which the magnetization direction of the first field magnet (70) is in the forward direction", the magnetic force acting on the first field magnet (70) in the forward direction can be strengthened. Further, when the state of the first field magnet (70) is the "second magnetized state in which the magnetization direction of the first field magnet (70) is in the reverse direction", the magnetic force acting on the first field magnet (70) in the reverse direction can be weakened. Also, the state of the first field magnet (70) can be switched from the second magnetized state to the demagnetized state, and further, it can be switched from the demagnetized state to the first magnetized state.

[0089] 〔Second Magnetic Force Control〕 FIG. 4 illustrates the flow of magnetic flux in the second magnetic force control of Embodiment 1.

[0090] In the second magnetic force control, the control unit (3) supplies a field current (i50) to the plurality of field windings (50). Then, in each of the plurality of field slots (35b), the control unit (3) controls the field current (i50) supplied to the plurality of field windings (50) so that the short-circuit magnetic flux (M51) of the field winding (50) in the field slot (35b) passes through the first field magnet (70) in the field slot (35b) in the reverse direction. Thereby, in each of the plurality of field slots (35b), the first field magnet (70) is magnetized in the reverse direction.

[0091] Note that, in this example, similar to the first magnetic force control, the field current (i50) supplied to the field winding (50) in the second magnetic force control is a quasi-impulse current with an extremely short flowing time. Also, the absolute value of the field current (i50) supplied to the field winding (50) in the second magnetic force control is larger than the absolute value of the field current (i50) supplied to the field winding (50) in the rotation control described later (specifically, the second, fourth, and sixth rotation controls). For example, the absolute value of the field current (i50) in the second magnetic force control is about 1.5 to 10 times the maximum value of the field current (i50) in the rotation control.

[0092] Also, similar to the first magnetic force control, in the second magnetic force control, the control unit (3) supplies armature current (i40) to a plurality of armature windings (40) as necessary.

[0093] Details of the magnetic flux in the second magnetic force control are as follows.

[0094] 〈Magnetic Flux of Field Winding: Short-Circuit Magnetic Flux〉 The flow direction of the short-circuit magnetic flux (M51) in the second magnetic force control is the opposite direction of the flow direction of the short-circuit magnetic flux (M51) in the first magnetic force control. Specifically, in the second magnetic force control, the short-circuit magnetic flux (M51) of the field winding (50) in the field slot (35b-1) passes through the stator yoke (31), the tooth (32-1), the first field magnet (70-1), and the tooth (32-2) in sequence, and returns to the stator yoke (31). In this way, the short-circuit magnetic flux (M51) of the field winding (50) in the field slot (35b-1) circulates counterclockwise around the field winding (50) in the field slot (35b-1). Note that the flow direction of the short-circuit magnetic flux (M51) of the field winding (50) in the field slot (35b-2) is the opposite direction of the flow direction of the short-circuit magnetic flux (M51) of the field winding (50) in the field slot (35b-1).

[0095] 〈Magnetic Flux of Field Winding: Linked Magnetic Flux〉 The flow direction of the linked magnetic flux (M52) in the second magnetic force control is the opposite direction of the flow direction of the linked magnetic flux (M52) in the first magnetic force control. Specifically, in the second magnetic force control, the linked magnetic flux (M52) of the field winding (50) in the field slot (35b-1) passes through the stator yoke (31), the tooth (32-1), the rotor core (11), and the tooth (32-3) in sequence, and returns to the stator yoke (31). In this way, the linked magnetic flux (M52) of the field winding (50) in the field slot (35b-1) circulates counterclockwise through the stator core (30) and the rotor core (11). Note that the flow direction of the linked magnetic flux (M52) of the field winding (50) in the field slot (35b-2) is the opposite direction of the flow direction of the linked magnetic flux (M52) of the field winding (50) in the field slot (35b-1).

[0096] 〈Magnetic Flux of the Second Field Magnet〉 The second magnet flux (M60) in the second magnetic force control (specifically, the second short-circuit flux (M61) and the second linked flux (M62)) is the same as the second magnet flux (M60) in the first magnetic force control.

[0097] 〈Effect of the second magnetic force control〉 As described above, by performing the second magnetic force control, it is possible to change the magnitude and direction of the magnetic force of the first field magnet (70) so that the magnetic force of the first field magnet (70) becomes stronger in the reverse direction. Specifically, when the state of the first field magnet (70) is "the first magnetized state in which the magnetization direction of the first field magnet (70) is in the forward direction", the magnetic force acting in the forward direction of the first field magnet (70) can be weakened. Further, when the state of the first field magnet (70) is "the second magnetized state in which the magnetization direction of the first field magnet (70) is in the reverse direction", the magnetic force acting in the reverse direction of the first field magnet (70) can be strengthened. Also, the state of the first field magnet (70) can be switched from the first magnetized state to the demagnetized state, and further, it can be switched from the demagnetized state to the second magnetized state.

[0098] In the second magnetic force control, the direction in which the second short-circuit flux (M61) of the second field magnet (60) passes through the first field magnet (70) is the reverse direction (specifically, the reverse direction of the forward direction of the magnetization direction of the first field magnet (70)). Thereby, in the second magnetic force control, the reverse magnetization of the first field magnet (70) by the short-circuit flux (M51) of the field winding (50) can be promoted. Therefore, the absolute value of the field current (i50) in the second magnetic force control can be made smaller than the absolute value of the field current (i50) in the first magnetic force control, and the copper loss of the rotating electrical machine (2) can be reduced. For example, the absolute value of the field current (i50) in the second magnetic force control can be set to 1 / 2 of the absolute value of the field current (i50) in the first magnetic force control.

[0099] 〔First rotation control〕 FIG. 5 illustrates the flow of magnetic flux in the first rotation control of Embodiment 1.

[0100] In the first rotation control, in each of the plurality of field slots (35b), the magnetization direction of the first field magnet (70) is set in the forward direction. As a result, the flow direction of the first cross-linking magnetic flux (M72) of the first field magnet (70) in the field slot (35b) is the same as the flow direction of the second cross-linking magnetic flux (M62) of the second field magnet (60) in that field slot (35b).

[0101] Also, in the first rotation control, the control unit (3) supplies armature current (i40) to the plurality of armature windings (40). Thereby, the rotor (10) rotates. Note that the control unit (3) does not supply field current (i50) to the plurality of field windings (50).

[0102] The details of the magnetic flux in the first rotation control are as follows.

[0103] 〈Magnetic Flux of the First Field Magnet: First Short-Circuit Magnetic Flux〉 In the first rotation control, the first short-circuit magnetic flux (M71) of the first field magnet (70-1) passes through the tooth (32-1), the stator yoke (31), and the tooth (32-2) in order from the first field magnet (70-1) and returns to the first field magnet (70-1). Thus, the first short-circuit magnetic flux (M71) of the first field magnet (70-1) circulates clockwise around the field winding (50) in the field slot (35b-1). Note that the flow direction of the first short-circuit magnetic flux (M71) of the first field magnet (70-2) is the opposite of the flow direction of the first short-circuit magnetic flux (M71) of the first field magnet (70-1).

[0104] 〈Magnetic Flux of the First Field Magnet: First Cross-Linking Magnetic Flux〉 In the first rotation control, the first interlinkage magnetic flux (M72) of the first field magnet (70-1) and the first interlinkage magnetic flux (M72) of the first field magnet (70-2) are combined. Then, the first interlinkage magnetic flux (M72) of the first field magnets (70-1, 70-2) passes through the teeth (32-1), the rotor core (11), the teeth (32-3), the first field magnet (70-2), the teeth (32-4), the stator yoke (31), and the teeth (32-2) in sequence from the first field magnet (70-1) and returns to the first field magnet (70-1). Thus, the first interlinkage magnetic flux (M72) of the first field magnets (70-1, 70-2) circulates counterclockwise through the stator core (30) and the rotor core (11).

[0105] 〈Magnetic Flux of the Second Field Magnet: Second Short-Circuit Magnetic Flux〉 In the first rotation control, the second short-circuit magnetic flux (M61) of the second field magnet (60-1) passes through the teeth (32-1), the stator yoke (31), and the teeth (32-2) in sequence from the second field magnet (60-1) and returns to the second field magnet (60-1). Thus, the second short-circuit magnetic flux (M61) of the second field magnet (60-1) circulates clockwise around the field winding (50) of the field slot (35b-1) and the first field magnet (70-1). Note that the flowing direction of the second short-circuit magnetic flux (M61) of the second field magnet (60-2) is opposite to the flowing direction of the second short-circuit magnetic flux (M61) of the second field magnet (60-1).

[0106] 〈Magnetic Flux of the Second Field Magnet: Second Interlinkage Magnetic Flux〉 In the first rotation control, the second interlinkage magnetic flux (M62) of the second field magnet (60-1) and the second interlinkage magnetic flux (M62) of the second field magnet (60-2) are combined. Then, the second interlinkage magnetic flux (M62) of the second field magnets (60-1, 60-2) passes through the teeth (32-1), the rotor core (11), the teeth (32-3), the second field magnet (60-2), the teeth (32-4), the stator yoke (31), and the teeth (32-2) in sequence from the second field magnet (60-1) and returns to the second field magnet (60-1). Thus, the second interlinkage magnetic flux (M62) of the second field magnets (60-1, 60-2) circulates counterclockwise through the stator core (30) and the rotor core (11).

[0107] <Effect of First Rotation Control> As described above, in the first rotation control, the field current (i50) is not supplied to the field winding (50). Thereby, the copper loss of the rotating electrical machine (2) can be reduced.

[0108] Also, in the first rotation control, the first magnetic flux linkage (M72) of the first field magnet (70) and the second magnetic flux linkage (M62) of the second field magnet (60) interlink with the rotor core (11). The flowing direction of the first magnetic flux linkage (M72) is the same as the flowing direction of the second magnetic flux linkage (M62). Therefore, torque corresponding to the sum of the second magnetic flux linkage (M62) and the first magnetic flux linkage (M72) can be generated in the rotor (10).

[0109] For example, the first rotation control is suitable for low-speed / low-torque operation. In low-speed / low-torque operation, the rotating electrical machine (2) is controlled such that the rotational speed of the rotor (10) is relatively low and the rotational torque of the rotor (10) is relatively low. For example, taking the case where the rotating electrical machine (2) is used as a power source of an automobile as an example, the low-speed / low-torque operation is performed in scenes such as urban driving.

[0110] [Second Rotation Control] FIG. 6 illustrates the flow of magnetic flux in the second rotation control of Embodiment 1. In the example of FIG. 6, due to the magnetic field generated by the supply of the field current (i50) to the field winding (50), the short-circuit magnetic flux (M51), the first short-circuit magnetic flux (M71), and the second short-circuit magnetic flux (M61) disappear.

[0111] In the second rotation control, in each of the plurality of field slots (35b), the magnetization direction of the first field magnet (70) is set in the forward direction. Thereby, the flowing direction of the first magnetic flux linkage (M72) of the first field magnet (70) in the field slot (35b) becomes the same as the flowing direction of the second magnetic flux linkage (M62) of the second field magnet (60) in the field slot (35b).

[0112] In the second rotation control, the control unit (3) supplies armature currents (i40) to a plurality of armature windings (40). Thereby, the rotor (10) rotates. Further, the control unit (3) supplies field currents (i50) to a plurality of field windings (50). Then, in each of the plurality of field slots (35b), the control unit (3) controls the field current (i50) supplied to the plurality of field windings (50) so that the flowing direction of the linked magnetic flux (M52) of the field winding (50) in the field slot (35b) is the same as the flowing direction of the second linked magnetic flux (M62) of the second field magnet (60) in the field slot (35b).

[0113] Details of the magnetic flux in the second rotation control are as follows.

[0114] 〈Magnetic Flux of Field Winding: Linked Magnetic Flux〉 In the second rotation control, the linked magnetic flux (M52) of the field winding (50) in the field slot (35b-1) passes through the stator yoke (31), the tooth (32-1), the rotor core (11), and the tooth (32-3) in this order, and returns to the stator yoke (31). Thus, the linked magnetic flux (M52) of the field winding (50) in the field slot (35b-1) circulates in the counterclockwise direction through the stator core (30) and the rotor core (11). Note that the flowing direction of the linked magnetic flux (M52) of the field winding (50) in the field slot (35b-2) is the reverse of the flowing direction of the linked magnetic flux (M52) of the field winding (50) in the field slot (35b-1).

[0115] 〈Magnetic Flux of the First Field Magnet: First Linked Magnetic Flux〉 In the second rotation control, the first linked magnetic flux (M72) of the first field magnet (70-1) passes through the tooth (32-1), the rotor core (11), the tooth (32-3), the stator yoke (31), and the tooth (32-2) in this order from the first field magnet (70-1), and returns to the first field magnet (70-1). Thus, the first linked magnetic flux (M72) of the first field magnet (70-1) circulates in the counterclockwise direction through the stator core (30) and the rotor core (11). Note that the flowing direction of the first linked magnetic flux (M72) of the first field magnet (70-2) is the reverse of the flowing direction of the first linked magnetic flux (M72) of the first field magnet (70-1).

[0116] <Magnetic Flux of the Second Field Magnet: Second Interlinked Magnetic Flux> In the second rotation control, the second interlinked magnetic flux (M62) of the second field magnet (60-1) passes through the teeth (32-1), the rotor core (11), the teeth (32-3), the stator yoke (31), and the teeth (32-2) in sequence from the second field magnet (60-1), and returns to the second field magnet (60-1). In this way, the second interlinked magnetic flux (M62) of the second field magnet (60-1) circulates in the counterclockwise direction between the stator core (30) and the rotor core (11). Note that the flow direction of the second interlinked magnetic flux (M62) of the second field magnet (60-2) is opposite to the flow direction of the second interlinked magnetic flux (M62) of the second field magnet (60-1).

[0117] <Effect of the Second Rotation Control> As described above, in the second rotation control, the interlinked magnetic flux (M52) of the field winding (50), the first interlinked magnetic flux (M72) of the first field magnet (70), and the second interlinked magnetic flux (M62) of the second field magnet (60) are interlinked with the rotor core (11). The flow direction of the interlinked magnetic flux (M52) is the same as the flow direction of the second interlinked magnetic flux (M62). The flow direction of the first interlinked magnetic flux (M72) is the same as the flow direction of the second interlinked magnetic flux (M62). Therefore, torque corresponding to the sum of the interlinked magnetic flux (M52), the first interlinked magnetic flux (M72), and the second interlinked magnetic flux (M62) can be generated on the rotor (10).

[0118] Also, in the second rotation control, by controlling the field current (i50), the interlinked magnetic flux (M52) of the field winding (50) can be controlled, and as a result, the torque generated on the rotor (10) can be controlled.

[0119] For example, the second rotation control is suitable for low-speed / high-torque operation. In low-speed / high-torque operation, the rotary electric machine (2) is controlled so that the rotational speed of the rotor (10) is relatively low and the rotational torque of the rotor (10) is relatively high. For example, taking the case where the rotary electric machine (2) is used as a power source of an automobile as an example, the low-speed / high-torque operation is performed in scenes such as driving on a steep slope, climbing a step, and starting.

[0120] 〔Third Rotation Control〕 FIG. 7 illustrates the flux flow in the third rotation control of Embodiment 1.

[0121] In the third rotation control, in each of the plurality of field slots (35b), the first field magnet (70) is set to a demagnetized state. As a result, in each of the plurality of field slots (35b), the magnetic force of the first field magnet (70) becomes substantially zero.

[0122] Also, in the third rotation control, the control unit (3) supplies armature current (i40) to the plurality of armature windings (40). Thereby, the rotor (10) rotates. Note that the control unit (3) does not supply field current (i50) to the plurality of field windings (50).

[0123] The details of the magnetic flux in the third rotation control are as follows.

[0124] 〈Magnetic Flux of the Second Field Magnet〉 The second magnet magnetic flux (M60) (specifically, the second short-circuit magnetic flux (M61) and the second interlinking magnetic flux (M62)) in the third rotation control is the same as the second magnet magnetic flux (M60) in the first rotation control.

[0125] 〈Effect of the Third Rotation Control〉 As described above, in the third rotation control, the supply of field current (i50) to the field winding (50) is not performed. Thereby, the copper loss of the rotary electric machine (2) can be reduced.

[0126] Also, in the third rotation control, the second interlinking magnetic flux (M62) of the second field magnet (60) interlinks with the rotor core (11). Thereby, torque corresponding to the second interlinking magnetic flux (M62) can be generated in the rotor (10).

[0127] For example, the third rotation control is suitable for high-speed / low-torque operation. In high-speed / low-torque operation, the rotary electric machine (2) is controlled such that the rotational speed of the rotor (10) is relatively high and the rotational torque of the rotor (10) is relatively low. For example, when the rotary electric machine (2) is used as a power source of an automobile, the high-speed / low-torque operation is performed in a scene such as highway cruising.

[0128] 〔Fourth Rotation Control〕 FIG. 8 illustrates the flow of magnetic flux in the fourth rotation control of Embodiment 1. In the example of FIG. 8, the short-circuit magnetic flux (M51) and the second short-circuit magnetic flux (M61) disappear due to the magnetic field generated by the supply of the field current (i50) to the field winding (50).

[0129] In the fourth rotation control, in each of the plurality of field slots (35b), the first field magnet (70) is set in a demagnetized state. Thereby, in each of the plurality of field slots (35b), the magnetic force of the first field magnet (70) becomes substantially zero.

[0130] Also, in the fourth rotation control, the control unit (3) supplies the armature current (i40) to the plurality of armature windings (40). Thereby, the rotor (10) rotates. Further, the control unit (3) supplies the field current (i50) to the plurality of field windings (50). Then, in each of the plurality of field slots (35b), the control unit (3) controls the field current (i50) supplied to the plurality of field windings (50) such that the flow direction of the linked magnetic flux (M52) of the field winding (50) in the field slot (35b) is the same as the flow direction of the second linked magnetic flux (M62) of the second field magnet (60) in the field slot (35b).

[0131] The details of the magnetic flux in the fourth rotation control are as follows.

[0132] 〈Magnetic Flux of Field Winding〉 The field magnetic flux (M50) (specifically, the linked magnetic flux (M52)) in the fourth rotation control is the same as the field magnetic flux (M50) in the second rotation control.

[0133] <Magnetic Flux of the Second Field Magnet> The second magnet flux (M60) (specifically, the second linked flux (M62)) in the fourth rotation control is the same as the second magnet flux (M60) in the third rotation control.

[0134] <Effect of the Fourth Rotation Control> As described above, in the fourth rotation control, the linked flux (M52) of the field winding (50) and the second linked flux (M62) of the second field magnet (60) are linked with the rotor core (11). The flowing direction of the linked flux (M52) is the same as that of the second linked flux (M62). Therefore, torque corresponding to the sum of the linked flux (M52) and the second linked flux (M62) can be generated in the rotor (10).

[0135] Also, in the fourth rotation control, by controlling the field current (i50), the linked flux (M52) of the field winding (50) can be controlled, and as a result, the torque generated in the rotor (10) can be controlled.

[0136] For example, the fourth rotation control is suitable for low-speed / high-torque operation.

[0137] 〔Fifth Rotation Control〕 FIG. 9 illustrates the flow of magnetic flux in the fifth rotation control of Embodiment 1.

[0138] In the fifth rotation control, in each of the plurality of field slots (35b), the magnetization direction of the first field magnet (70) is set in the reverse direction. Thereby, the flowing direction of the first linked flux (M72) of the first field magnet (70) in the field slot (35b) becomes the reverse direction of the flowing direction of the second linked flux (M62) of the second field magnet (60) in that field slot (35b).

[0139] Also, in the fifth rotation control, the control unit (3) supplies the armature current (i40) to the plurality of armature windings (40). Thereby, the rotor (10) rotates. Note that the control unit (3) does not supply the field current (i50) to the plurality of field windings (50).

[0140] Details of the magnetic flux in the fifth rotation control are as follows.

[0141] 〈Magnetic Flux of the First Field Magnet: First Short-Circuit Magnetic Flux〉 The flow direction of the first short-circuit magnetic flux (M71) in the fifth rotation control is the reverse of the flow direction of the first short-circuit magnetic flux (M71) in the first rotation control. Specifically, in the fifth rotation control, the first short-circuit magnetic flux (M71) of the first field magnet (70-1) passes through the teeth (32-2), the stator yoke (31), and the teeth (32-1) in sequence from the first field magnet (70-1) and returns to the first field magnet (70-1). In this way, the first short-circuit magnetic flux (M71) of the first field magnet (70-1) circulates counterclockwise around the field winding (50) of the field slot (35b-1). Note that the flow direction of the first short-circuit magnetic flux (M71) of the first field magnet (70-2) is the reverse of the flow direction of the first short-circuit magnetic flux (M71) of the first field magnet (70-1).

[0142] 〈Magnetic Flux of the First Field Magnet: First Linked Magnetic Flux〉 The flow direction of the first linked magnetic flux (M72) in the fifth rotation control is the reverse of the flow direction of the first linked magnetic flux (M72) in the first rotation control. Specifically, in the fifth rotation control, the first linked magnetic flux (M72) of the first field magnet (70-1) and the first linked magnetic flux (M72) of the first field magnet (70-2) are combined. Then, the first linked magnetic flux (M72) of the first field magnets (70-1, 70-2) passes through the teeth (32-2), the stator yoke (31), the teeth (32-4), the first field magnet (70-2), the teeth (32-3), the rotor core (11), and the teeth (32-1) in sequence from the first field magnet (70-1) and returns to the first field magnet (70-1). In this way, the first linked magnetic flux (M72) of the first field magnets (70-1, 70-2) circulates clockwise around the stator core (30) and the rotor core (11).

[0143] 〈Magnetic Flux of the Second Field Magnet〉 The second magnet magnetic flux (M60) (specifically, the second short-circuit magnetic flux (M61) and the second linked magnetic flux (M62)) in the fifth rotation control is the same as the second magnet magnetic flux (M60) in the first rotation control.

[0144] <Effect of Fifth Rotation Control> As described above, in the fifth rotation control, the field current (i50) is not supplied to the field winding (50). Thereby, the copper loss of the rotating electrical machine (2) can be reduced.

[0145] Also, in the fifth rotation control, the first magnetic flux linkage (M72) of the first field magnet (70) and the second magnetic flux linkage (M62) of the second field magnet (60) interlink with the rotor core (11). The flowing direction of the first magnetic flux linkage (M72) is the reverse direction of the flowing direction of the second magnetic flux linkage (M62). Therefore, torque corresponding to the difference between the first magnetic flux linkage (M72) and the second magnetic flux linkage (M62) can be generated in the rotor (10).

[0146] For example, the fifth rotation control is suitable for high-speed / low-torque operation.

[0147] [Sixth Rotation Control] FIG. 10 illustrates the flow of magnetic flux in the sixth rotation control of Embodiment 1. In the example of FIG. 10, due to the magnetic field generated by the supply of the field current (i50) to the field winding (50), the short-circuit magnetic flux (M51), the first short-circuit magnetic flux (M71), and the second short-circuit magnetic flux (M61) disappear.

[0148] In the sixth rotation control, in each of the plurality of field slots (35b), the magnetization direction of the first field magnet (70) is set in the reverse direction. Thereby, the flowing direction of the first magnetic flux linkage (M72) of the first field magnet (70) in the field slot (35b) becomes the reverse direction of the flowing direction of the second magnetic flux linkage (M62) of the second field magnet (60) in that field slot (35b).

[0149] In the sixth rotation control, the control unit (3) supplies armature current (i40) to a plurality of armature windings (40). As a result, the rotor (10) rotates. The control unit (3) also supplies field current (i50) to a plurality of field windings (50). Then, in each of the plurality of field slots (35b), the control unit (3) controls the field current (i50) supplied to the plurality of field windings (50) so that the flowing direction of the linked magnetic flux (M52) of the field winding (50) in the field slot (35b) is the same as the flowing direction of the second linked magnetic flux (M62) of the second field magnet (60) in the field slot (35b).

[0150] Details of the magnetic flux in the sixth rotation control are as follows.

[0151] 〈Magnetic Flux of Field Winding〉 The field magnetic flux (M50) (specifically, the linked magnetic flux (M52)) in the sixth rotation control is the same as the field magnetic flux (M50) in the second rotation control.

[0152] 〈Magnetic Flux of the First Field Magnet: First Linked Magnetic Flux〉 The flowing direction of the first linked magnetic flux (M72) in the sixth rotation control is the reverse of the flowing direction of the first linked magnetic flux (M72) in the second rotation control. Specifically, in the sixth rotation control, the first linked magnetic flux (M72) of the first field magnet (70-1) passes through the teeth (32-2), the stator yoke (31), the teeth (32-3), the rotor core (11), and the teeth (32-1) in order from the first field magnet (70-1) and returns to the first field magnet (70-1). In this way, the first linked magnetic flux (M72) of the first field magnet (70-1) circulates in the clockwise direction through the stator core (30) and the rotor core (11). Note that the flowing direction of the first linked magnetic flux (M72) of the first field magnet (70-2) is the reverse of the flowing direction of the first linked magnetic flux (M72) of the first field magnet (70-1).

[0153] 〈Magnetic Flux of the Second Field Magnet〉 The second magnet magnetic flux (M60) (specifically, the second linked magnetic flux (M62)) in the sixth rotation control is the same as the second magnet magnetic flux (M60) in the fifth rotation control.

[0154] <Effect of the Sixth Rotation Control> As described above, in the sixth rotation control, the magnetic flux linkage (M52) of the field winding (50), the first magnetic flux linkage (M72) of the first field magnet (70), and the second magnetic flux linkage (M62) of the second field magnet (60) interlink with the rotor core (11). The flowing direction of the magnetic flux linkage (M52) is the same as that of the second magnetic flux linkage (M62). The flowing direction of the first magnetic flux linkage (M72) is opposite to that of the second magnetic flux linkage (M62). Therefore, torque corresponding to the difference between "the sum of the magnetic flux linkage (M52) and the second magnetic flux linkage (M62)" and "the first magnetic flux linkage (M72)" can be generated in the rotor (10).

[0155] Also, in the sixth rotation control, by controlling the field current (i50), the magnetic flux linkage (M52) of the field winding (50) can be controlled, and as a result, the torque generated in the rotor (10) can be controlled.

[0156] For example, the sixth rotation control is suitable for low-speed / high-torque operation. Note that the sixth rotation control may be omitted. The same applies to other controls.

[0157] <Effect of Embodiment 1> As described above, in the rotary electric machine device (1) of Embodiment 1, the rotary electric machine (2) includes a rotor (10) and a stator (20). The stator (20) has a stator core (30), an armature winding (40), a field winding (50), a first field magnet (70), and a second field magnet (60). The stator core (30) is provided with armature slots (35a) and field slots (35b) that are alternately arranged in the circumferential direction. The armature winding (40) is accommodated in the armature slots (35a). The field winding (50), the first field magnet (70), and the second field magnet (60) are accommodated in the field slots (35b). The armature winding (40) generates a rotating magnetic field that rotates the rotor (10) when an alternating armature current (i40) is supplied. The field winding (50) generates a field magnetic flux (M50) when a direct current field current (i50) is supplied. The second field magnet (60) has a magnetic pole surface facing the circumferential direction. The first field magnet (70) is arranged magnetically in parallel with the second field magnet (60), and the magnetic force thereof can be changed by the field magnetic flux (M50).

[0158] In the above configuration, the magnitude and direction of the magnetic force of the first field magnet (70) can be changed by the field magnetic flux (M50). Thereby, for example, it is possible to switch between a first magnetized state in which the direction of the magnetic force of the first field magnet (70) is in the forward direction, a demagnetized state in which the magnetic force of the first field magnet (70) is substantially zero, and a second magnetized state in which the direction of the magnetic force of the first field magnet (70) is in the reverse direction. Also, it is possible to switch between a energized state in which the field current (i50) is supplied to the field winding (50) and a non-energized state in which the field current (i50) is not supplied to the field winding (50). Thereby, since six operation modes can be realized, the control of the rotary electric machine (2) can be diversified.

[0159] Also, in the rotary electric machine device (1) of Embodiment 1, the stator (20) has a second field magnet (60) accommodated in the field slot (35b).

[0160] In the above configuration, even when the magnetic force of the first field magnet (70) is substantially zero, the second field magnet (60) can provide a magnetic flux (M60) in a certain direction.

[0161] Also, in the rotating electrical machine device (1) of Embodiment 1, within the operating temperature range of the rotating electrical machine (2), the maximum value of the coercive force of the first field magnet (70) is smaller than the minimum value of the coercive force of the second field magnet (60).

[0162] In the above configuration, the second field magnet (60) can be configured so that the change in the magnetic force of the second field magnet (60) due to the field magnetic flux (M50) of the field winding (50) hardly occurs. Thereby, the switching between the first magnetized state, the demagnetized state, and the second magnetized state can be appropriately performed, and the control of the rotating electrical machine (2) can be appropriately performed.

[0163] Also, in the rotating electrical machine device (1) of Embodiment 1, the first field magnet (70) is arranged radially outside the second field magnet (60) within the field slot (35b).

[0164] In the above configuration, the second field magnet (60) can be brought closer to the rotor (10) than when the second field magnet (60) is arranged radially outside the first field magnet (70) within the field slot (35b). Thereby, since the magnetic flux of the second field magnet (60) easily intersects with the rotor (10), the magnetic flux of the second field magnet (60) can be effectively utilized.

[0165] Also, in the rotating electrical machine device (1) of Embodiment 1, the field winding (50) is arranged radially outside the first field magnet (70) within the field slot (35b).

[0166] In the above configuration, the first field magnet (70) can be brought closer to the field winding (50) than in the case where the second field magnet (60) is interposed between the field winding (50) and the first field magnet (70) within the field slot (35b). Thereby, the field magnetic flux (M50) of the field winding (50) can be efficiently passed through the first field magnet (70), so that the change in the magnetic force of the first field magnet (70) due to the field magnetic flux (M50) can be facilitated. Further, since the first field magnet (70) is located on the inner peripheral side of the second field magnet (60) when viewed from the field winding (50), when the first field magnet (70) is magnetized / demagnetized, the field magnetic flux (M50) of the field winding (50) preferentially passes through the first field magnet (70) rather than the second field magnet (60). Thereby, the magnetization / demagnetization of the first field magnet (70) can be facilitated. Also, positioning of the rotor (10) is not required.

[0167] Further, in the rotating electrical machine device (1) of Embodiment 1, the circumferential length (LC70) of the first field magnet (70) is equal to or less than the circumferential length (LC60) of the radially outer portion of the second field magnet (60), and is equal to or less than the circumferential length (LC350) of the radially inner portion of the winding accommodating portion (350) of the field slot (35b).

[0168] In the above configuration, when the first field magnet (70) is viewed from the rotation center axis (P) of the rotor (10), the circumferential end portion of the first field magnet (70) can be prevented from protruding from the second field magnet (60). Thereby, generation of fringing magnetic flux at the circumferential end portion of the first field magnet (70) can be suppressed, so that demagnetization of the first field magnet (70) due to the fringing magnetic flux can be reduced. Thus, when operating with a certain magnetic force, the magnetic flux of the first field magnet (70) can be effectively utilized.

[0169] (Embodiment 2) FIG. 11 illustrates the configuration of the rotating electrical machine device (1) according to Embodiment 2. In the rotating electrical machine device (1) of Embodiment 2, the configuration within the field slot (35b) of the stator (20) of the rotating electrical machine (2) is different from that of the rotating electrical machine device (1) of Embodiment 1. Other configurations of the rotating electrical machine device (1) according to Embodiment 2 are the same as those of the rotating electrical machine device (1) according to Embodiment 1.

[0170] 〔Configuration within the field slot〕 FIG. 12 illustrates the configuration within the field slot (35b) in Embodiment 2. The configuration within the field slot (35b) of Embodiment 2 is different from the configuration within the field slot (35b) of Embodiment 1 in the arrangement of the field winding (50) and the first field magnet (70). Other configurations within the field slot (35b) of Embodiment 2 are the same as those within the field slot (35b) of Embodiment 1.

[0171] In Embodiment 2, the winding accommodating portion (350) is arranged radially outside the second magnet accommodating portion (351), and the first magnet accommodating portion (352) is arranged radially outside the winding accommodating portion (350). With such a configuration, in Embodiment 2, the field winding (50) is arranged radially outside the second field magnet (60) within the field slot (35b), and the first field magnet (70) is arranged radially outside the field winding (50) within the field slot (35b).

[0172] Also, in Embodiment 2, the circumferential length (LC70) of the first field magnet (70) is equal to or less than the circumferential length (LC350) of the radially outer portion of the winding accommodating portion (350) of the field slot (35b).

[0173] In the example of FIG. 12, the winding accommodating portion (350) communicates with the second magnet accommodating portion (351), and the first magnet accommodating portion (352) communicates with the winding accommodating portion (350). The field winding (50) is adjacent to the radially outer side of the second field magnet (60), and the first field magnet (70) is adjacent to the radially outer side of the field winding (50). The circumferential length (LC70) of the first field magnet (70) is the same as the circumferential length (LC60) of the portion on the radially outer side of the second field magnet (60), and is shorter than the circumferential length (LC350) of the portion on the radially inner side of the winding accommodating portion (350). The radial length (LR70) of the first field magnet (70) is shorter than the circumferential length (LC70) of the first field magnet (70). Further, the radial length (LR70) of the first field magnet (70) is shorter than each of the radial length (LR60) of the second field magnet (60) and the radial length (LR350) of the winding accommodating portion (350).

[0174] 〔Operation of Control Unit〕 Similar to the control unit (3) of Embodiment 1, the control unit (3) of Embodiment 2 selectively performs first magnetic force control, second magnetic force control, first rotation control, second rotation control, third rotation control, fourth rotation control, fifth rotation control, and sixth rotation control.

[0175] 〔First Magnetic Force Control〕 FIG. 13 illustrates the flow of magnetic flux in the first magnetic force control of Embodiment 2.

[0176] The operation of the control unit (3) in the first magnetic force control of Embodiment 2 is the same as the operation of the control unit (3) in the first magnetic force control of Embodiment 1. The details of the magnetic flux in the first magnetic force control of Embodiment 2 are as follows.

[0177] 〈Magnetic Flux of Field Winding: Short-Circuit Magnetic Flux〉 In the first magnetic force control, the short-circuit magnetic flux (M51) of the field winding (50) in the field slot (35b-1) passes through the teeth (32-2), the first field magnet (70-1), and the teeth (32-1) in sequence from the second field magnet (60-1), and returns to the second field magnet (60-1). In this way, the short-circuit magnetic flux (M51) of the field winding (50) in the field slot (35b-1) circulates counterclockwise around the field winding (50) in the field slot (35b-1). Note that the flow direction of the short-circuit magnetic flux (M51) of the field winding (50) in the field slot (35b-2) is opposite to the flow direction of the short-circuit magnetic flux (M51) of the field winding (50) in the field slot (35b-1).

[0178] 〈Magnetic Flux of Field Winding: Linked Magnetic Flux〉 In the first magnetic force control, the linked magnetic flux (M52) of the field winding (50) in the field slot (35b-1) passes through the teeth (32-1), the rotor core (11), and the teeth (32-3) in sequence from the stator yoke (31), and returns to the stator yoke (31). In this way, the linked magnetic flux (M52) of the field winding (50) in the field slot (35b-1) circulates counterclockwise through the stator core (30) and the rotor core (11). Note that the flow direction of the linked magnetic flux (M52) of the field winding (50) in the field slot (35b-2) is opposite to the flow direction of the linked magnetic flux (M52) of the field winding (50) in the field slot (35b-1).

[0179] 《Magnetic Flux of the Second Field Magnet: Second Short-Circuit Magnetic Flux》 In the first magnetic force control, the second short-circuit magnetic flux (M61) of the second field magnet (60-1) passes through the teeth (32-1), the first field magnet (70-1), and the teeth (32-2) in sequence from the second field magnet (60-1), and returns to the second field magnet (60-1). In this way, the second short-circuit magnetic flux (M61) of the second field magnet (60-1) circulates clockwise around the field winding (50) in the field slot (35b-1). Note that the flow direction of the second short-circuit magnetic flux (M61) of the second field magnet (60-2) is opposite to the flow direction of the second short-circuit magnetic flux (M61) of the second field magnet (60-1).

[0180] 《Magnetic Flux of the Second Field Magnet: Second Linked Magnetic Flux》 In the first magnetic force control, the second interlinkage magnetic flux (M62) of the second field magnet (60-1) passes from the second field magnet (60-1) through the tooth (32-1), the rotor core (11), the tooth (32-3), the stator yoke (31), and the tooth (32-2) in sequence, and then returns to the second field magnet (60-1). In this way, the second interlinkage magnetic flux (M62) of the second field magnet (60-1) circulates in the counterclockwise direction between the stator core (30) and the rotor core (11). Note that the flowing direction of the second interlinkage magnetic flux (M62) of the second field magnet (60-2) is opposite to that of the second interlinkage magnetic flux (M62) of the second field magnet (60-1).

[0181] 〈Effect of the first magnetic force control〉 In the first magnetic force control of Embodiment 2, the same effect as that of the first magnetic force control of Embodiment 1 can be obtained.

[0182] 〔Second magnetic force control〕 FIG. 14 illustrates the flow of magnetic flux in the second magnetic force control of Embodiment 2.

[0183] The operation of the control unit (3) in the second magnetic force control of Embodiment 2 is the same as that of the control unit (3) in the second magnetic force control of Embodiment 1. The details of the magnetic flux in the second magnetic force control of Embodiment 2 are as follows.

[0184] 〈Magnetic flux of the field winding: Short-circuit magnetic flux〉 In the second magnetic force control, the flow direction of the short-circuit magnetic flux (M51) is opposite to that in the first magnetic force control. Specifically, in the second magnetic force control, the short-circuit magnetic flux (M51) of the field winding (50) in the field slot (35b-1) passes through the teeth (32-1), the first field magnet (70-1), and the teeth (32-2) in sequence from the second field magnet (60-1), and returns to the second field magnet (60-1). In this way, the short-circuit magnetic flux (M51) of the field winding (50) in the field slot (35b-1) circulates in the clockwise direction around the field winding (50) in the field slot (35b-1). Note that the flow direction of the short-circuit magnetic flux (M51) of the field winding (50) in the field slot (35b-2) is opposite to that of the short-circuit magnetic flux (M51) of the field winding (50) in the field slot (35b-1).

[0185] 〈Magnetic Flux of Field Winding: Linked Magnetic Flux〉 In the second magnetic force control, the flow direction of the linked magnetic flux (M52) is opposite to that in the first magnetic force control. Specifically, in the second magnetic force control, the linked magnetic flux (M52) of the field winding (50) in the field slot (35b-1) passes through the teeth (32-3), the rotor core (11), and the teeth (32-1) in sequence from the stator yoke (31), and returns to the stator yoke (31). In this way, the linked magnetic flux (M52) of the field winding (50) in the field slot (35b-1) circulates in the clockwise direction through the stator core (30) and the rotor core (11). Note that the flow direction of the linked magnetic flux (M52) of the field winding (50) in the field slot (35b-2) is opposite to that of the linked magnetic flux (M52) of the field winding (50) in the field slot (35b-1).

[0186] 〈Magnetic Flux of the Second Field Magnet〉 The second magnet magnetic flux (M60) (specifically, the second short-circuit magnetic flux (M61) and the second linked magnetic flux (M62)) in the second magnetic force control is the same as that in the first magnetic force control.

[0187] 〈Effect of the Second Magnetic Force Control〉 In the second magnetic force control of Embodiment 2, the same effects as those of the second magnetic force control of Embodiment 1 can be obtained.

[0188] 〔First Rotation Control〕 FIG. 15 illustrates the flow of magnetic flux in the first rotation control of Embodiment 2.

[0189] In the first rotation control, the magnetization direction of the first field magnet (70) is set in the forward direction. The operation of the control unit (3) in the first rotation control of Embodiment 2 is the same as the operation of the control unit (3) in the first rotation control of Embodiment 1. The details of the magnetic flux in the first rotation control of Embodiment 2 are as follows.

[0190] 〈Magnetic Flux of the First Field Magnet: First Short-Circuit Magnetic Flux〉 In the first rotation control, the first short-circuit magnetic flux (M71) of the first field magnet (70-1) passes through the tooth (32-1), the stator yoke (31), and the tooth (32-2) in order from the first field magnet (70-1) and returns to the first field magnet (70-1). In this way, the first short-circuit magnetic flux (M71) of the first field magnet (70-1) circulates in the clockwise direction between the first field magnet (70-1) and the stator yoke (31). Note that the flow direction of the first short-circuit magnetic flux (M71) of the first field magnet (70-2) is opposite to the flow direction of the first short-circuit magnetic flux (M71) of the first field magnet (70-1).

[0191] 〈Magnetic Flux of the First Field Magnet: First Linked Magnetic Flux〉 In the first rotation control, the first linked magnetic flux (M72) of the first field magnet (70-1) and the first linked magnetic flux (M72) of the first field magnet (70-2) are combined. Then, the first linked magnetic flux (M72) of the first field magnets (70-1, 70-2) passes through the tooth (32-1), the rotor core (11), the tooth (32-3), the second field magnet (60-2), the tooth (32-4), the stator yoke (31), and the tooth (32-2) in order from the first field magnet (70-1) and returns to the first field magnet (70-1). In this way, the first linked magnetic flux (M72) of the first field magnets (70-1, 70-2) circulates in the counterclockwise direction between the stator core (30) and the rotor core (11).

[0192] 〈Magnetic Flux of the Second Field Magnet: Second Short-Circuit Magnetic Flux〉 In the first rotation control, the second short-circuit magnetic flux (M61) of the second field magnet (60-1) passes through the teeth (32-1), the first field magnet (70-1), and the teeth (32-2) in order from the second field magnet (60-1), and returns to the second field magnet (60-1). In this way, the second short-circuit magnetic flux (M61) of the second field magnet (60-1) circulates clockwise around the field winding (50) of the field slot (35b-1). Note that the flow direction of the second short-circuit magnetic flux (M61) of the second field magnet (60-2) is opposite to the flow direction of the second short-circuit magnetic flux (M61) of the second field magnet (60-1).

[0193] 〈Magnetic Flux of Second Field Magnet: Second Linked Magnetic Flux〉 In the first rotation control, the second linked magnetic flux (M62) of the second field magnet (60-1) and the second linked magnetic flux (M62) of the second field magnet (60-2) are combined. Then, the second linked magnetic flux (M62) of the second field magnets (60-1, 60-2) passes through the teeth (32-1), the rotor core (11), the teeth (32-3), the second field magnet (60-2), the teeth (32-4), the stator yoke (31), and the teeth (32-2) in order from the second field magnet (60-1), and returns to the second field magnet (60-1). In this way, the second linked magnetic flux (M62) of the second field magnets (60-1, 60-2) circulates counterclockwise through the stator core (30) and the rotor core (11).

[0194] 〈Effect of First Rotation Control〉 In the first rotation control of Embodiment 2, the same effect as the effect of the first rotation control of Embodiment 1 can be obtained.

[0195] 〔Second Rotation Control〕 FIG. 16 illustrates the flow of magnetic flux in the second rotation control of Embodiment 2. In the example of FIG. 16, due to the magnetic field generated by the supply of the field current (i50) to the field winding (50), the short-circuit magnetic flux (M51), the first short-circuit magnetic flux (M71), and the second short-circuit magnetic flux (M61) disappear.

[0196] In the second rotation control, the magnetization direction of the first field magnet (70) is set in the forward direction. The operation of the control unit (3) in the second rotation control of Embodiment 2 is the same as the operation of the control unit (3) in the second rotation control of Embodiment 1. The details of the magnetic flux in the second rotation control of Embodiment 2 are as follows.

[0197] 〈Magnetic Flux of Field Winding: Linked Magnetic Flux〉 In the second rotation control, the linked magnetic flux (M52) of the field winding (50) in the field slot (35b-1) passes through the stator yoke (31), the tooth (32-1), the rotor core (11), the tooth (32-3) in order, and returns to the stator yoke (31). In this way, the linked magnetic flux (M52) of the field winding (50) in the field slot (35b-1) circulates counterclockwise through the stator core (30) and the rotor core (11). Note that the flow direction of the linked magnetic flux (M52) of the field winding (50) in the field slot (35b-2) is the reverse of the flow direction of the linked magnetic flux (M52) of the field winding (50) in the field slot (35b-1).

[0198] 〈Magnetic Flux of the First Field Magnet: First Linked Magnetic Flux〉 In the second rotation control, the first linked magnetic flux (M72) of the first field magnet (70-1) passes through the tooth (32-1), the rotor core (11), the tooth (32-3), the stator yoke (31), the tooth (32-2) in order from the first field magnet (70-1), and returns to the first field magnet (70-1). In this way, the first linked magnetic flux (M72) of the first field magnet (70-1) circulates counterclockwise through the stator core (30) and the rotor core (11). Note that the flow direction of the first linked magnetic flux (M72) of the first field magnet (70-2) is the reverse of the flow direction of the first linked magnetic flux (M72) of the first field magnet (70-1).

[0199] 〈Magnetic Flux of the Second Field Magnet: Second Linked Magnetic Flux〉 In the second rotation control, the second interlinkage magnetic flux (M62) of the second field magnet (60-1) passes from the second field magnet (60-1) through the tooth (32-1), the rotor core (11), the tooth (32-3), the stator yoke (31), and the tooth (32-2) in sequence and returns to the second field magnet (60-1). In this way, the second interlinkage magnetic flux (M62) of the second field magnet (60-1) circulates between the stator core (30) and the rotor core (11) in the counterclockwise direction. Note that the flow direction of the second interlinkage magnetic flux (M62) of the second field magnet (60-2) is opposite to the flow direction of the second interlinkage magnetic flux (M62) of the second field magnet (60-1).

[0200] 〈Effect of the second rotation control〉 In the second rotation control of Embodiment 2, the same effect as that of the second rotation control of Embodiment 1 can be obtained.

[0201] Also, in the second rotation control of Embodiment 2, the short-circuit magnetic flux (M51) of the field winding (50) passes through the first field magnet (70) in the forward direction. Since the direction in which the short-circuit magnetic flux (M51) passes through the first field magnet (70) is the same as the magnetization direction of the first field magnet (70), demagnetization of the first field magnet (70) due to the short-circuit magnetic flux (M51) is less likely to occur. In this way, since the first field magnet (70) is less likely to be demagnetized during the operation of the rotary electric machine (2), the operation efficiency of the rotary electric machine (2) can be improved.

[0202] 〔Third rotation control〕 FIG. 17 illustrates the flow of magnetic flux in the third rotation control of Embodiment 2.

[0203] In the third rotation control, the first field magnet (70) is set to a demagnetized state. The operation of the control unit (3) in the third rotation control of Embodiment 2 is the same as the operation of the control unit (3) in the third rotation control of Embodiment 1. The details of the magnetic flux in the third rotation control of Embodiment 2 are as follows.

[0204] 〈Magnetic flux of the second field magnet〉 The second magnet flux (M60) in the third rotation control (specifically, the second short-circuit flux (M61) and the second linked flux (M62)) is the same as the second magnet flux (M60) in the first rotation control.

[0205] 〈Effect of the third rotation control〉 In the third rotation control of Embodiment 2, the same effect as the effect of the third rotation control of Embodiment 1 can be obtained.

[0206] 〔Fourth rotation control〕 FIG. 18 illustrates the flow of magnetic flux in the fourth rotation control of Embodiment 2. In the example of FIG. 18, the short-circuit flux (M51) and the second short-circuit flux (M61) disappear due to the magnetic field generated by the supply of the field current (i50) to the field winding (50).

[0207] In the fourth rotation control, the first field magnet (70) is set in a demagnetized state. The operation of the control unit (3) in the fourth rotation control of Embodiment 2 is the same as the operation of the control unit (3) in the fourth rotation control of Embodiment 1. The details of the magnetic flux in the fourth rotation control of Embodiment 2 are as follows.

[0208] 〈Magnetic flux of the field winding〉 The field magnetic flux (M50) (specifically, the linked flux (M52)) in the fourth rotation control is the same as the field magnetic flux (M50) in the second rotation control.

[0209] 〈Magnetic flux of the second field magnet〉 The second magnet flux (M60) (specifically, the second linked flux (M62)) in the fourth rotation control is the same as the second magnet flux (M60) in the third rotation control.

[0210] 〈Effect of the fourth rotation control〉 In the fourth rotation control of Embodiment 2, the same effect as the effect of the fourth rotation control of Embodiment 1 can be obtained.

[0211] 〔Fifth rotation control〕 FIG. 19 illustrates the flow of magnetic flux in the fifth rotation control of Embodiment 2.

[0212] In the fifth rotation control, the magnetization direction of the first field magnet (70) is set in the reverse direction. The operation of the control unit (3) in the fifth rotation control of Embodiment 2 is the same as the operation of the control unit (3) in the fifth rotation control of Embodiment 1. The details of the magnetic flux in the fifth rotation control of Embodiment 2 are as follows.

[0213] 〈Magnetic Flux of the First Field Magnet: First Short-Circuit Magnetic Flux〉 The flow direction of the first short-circuit magnetic flux (M71) in the fifth rotation control is the reverse direction of the flow direction of the first short-circuit magnetic flux (M71) in the first rotation control. Specifically, in the fifth rotation control, the first short-circuit magnetic flux (M71) of the first field magnet (70-1) passes through the teeth (32-2), the stator yoke (31), and the teeth (32-2) in sequence from the first field magnet (70-1), and returns to the first field magnet (70-1). In this way, the first short-circuit magnetic flux (M71) of the first field magnet (70-1) circulates counterclockwise between the first field magnet (70-1) and the stator yoke (31). Note that the flow direction of the first short-circuit magnetic flux (M71) of the first field magnet (70-2) is the reverse direction of the flow direction of the first short-circuit magnetic flux (M71) of the first field magnet (70-1).

[0214] 〈Magnetic Flux of the First Field Magnet: First Linked Magnetic Flux〉 The flow direction of the first linked magnetic flux (M72) in the fifth rotation control is the reverse direction of the flow direction of the first linked magnetic flux (M72) in the first rotation control. Specifically, in the fifth rotation control, the first linked magnetic flux (M72) of the first field magnet (70-1) and the first linked magnetic flux (M72) of the first field magnet (70-2) are combined. Then, the first linked magnetic flux (M72) of the first field magnets (70-1, 70-2) passes through the teeth (32-2), the stator yoke (31), the teeth (32-4), the second field magnet (60-2), the teeth (32-3), the rotor core (11), and the teeth (32-1) in sequence from the first field magnet (70-1), and returns to the first field magnet (70-1). In this way, the first linked magnetic flux (M72) of the first field magnets (70-1, 70-2) circulates clockwise between the stator core (30) and the rotor core (11).

[0215] 〈Magnetic Flux of the Second Field Magnet〉 The second magnet flux (M60) in the fifth rotation control (specifically, the second short-circuit flux (M61) and the second linkage flux (M62)) is the same as the second magnet flux (M60) in the first rotation control.

[0216] 〈Effect of the fifth rotation control〉 In the fifth rotation control of the second embodiment, the same effect as the effect of the fifth rotation control of the first embodiment can be obtained.

[0217] 〔Sixth rotation control〕 FIG. 20 illustrates the flow of magnetic flux in the sixth rotation control of the second embodiment. In the example of FIG. 20, due to the magnetic field generated by the supply of the field current (i50) to the field winding (50), the short-circuit flux (M51), the first short-circuit flux (M71), and the second short-circuit flux (M61) disappear.

[0218] In the sixth rotation control, the magnetization direction of the first field magnet (70) is set in the reverse direction. The operation of the control unit (3) in the sixth rotation control of the second embodiment is the same as the operation of the control unit (3) in the sixth rotation control of the first embodiment. The details of the magnetic flux in the sixth rotation control of the second embodiment are as follows.

[0219] 〈Magnetic flux of the field winding〉 The field magnetic flux (M50) in the sixth rotation control (specifically, the linkage flux (M52)) is the same as the field magnetic flux (M50) in the second rotation control.

[0220] 〈Magnetic flux of the first field magnet: First linkage flux〉 In the sixth rotation control, the flow direction of the first cross-linking magnetic flux (M72) is opposite to the flow direction of the first cross-linking magnetic flux (M72) in the second rotation control. Specifically, in the second rotation control, the first cross-linking magnetic flux (M72) of the first field magnet (70-1) passes from the first field magnet (70-1) through the tooth (32-2), the stator yoke (31), the tooth (32-3), the rotor core (11), and the tooth (32-1) in sequence and returns to the first field magnet (70-1). In this way, the first cross-linking magnetic flux (M72) of the first field magnet (70-1) circulates in the clockwise direction through the stator core (30) and the rotor core (11). Note that the flow direction of the first cross-linking magnetic flux (M72) of the first field magnet (70-2) is opposite to the flow direction of the first cross-linking magnetic flux (M72) of the first field magnet (70-1).

[0221] 〈Magnetic Flux of the Second Field Magnet〉 The second magnet magnetic flux (M60) (specifically, the second cross-linking magnetic flux (M62)) in the sixth rotation control is the same as the second magnet magnetic flux (M60) in the fifth rotation control.

[0222] 〈Effect of the Sixth Rotation Control〉 In the sixth rotation control of Embodiment 2, the same effects as those of the sixth rotation control of Embodiment 1 can be obtained. Note that the sixth rotation control may be omitted. The same also applies to other controls.

[0223] 〔Effect of Embodiment 2〕 In the rotary electric machine device (1) of Embodiment 2, the same effects as those of the rotary electric machine device (1) of Embodiment 1 can be obtained. For example, since six operation modes can be realized, the control of the rotary electric machine (2) can be diversified.

[0224] Also, in the rotary electric machine device (1) of Embodiment 2, the field winding (50) is arranged radially outside the second field magnet (60) within the field slot (35b). The first field magnet (70) is arranged radially outside the field winding (50) within the field slot (35b).

[0225] In the above configuration, the first field magnet (70) can be brought closer to the field winding (50) than in the case where the second field magnet (60) is interposed between the field winding (50) and the first field magnet (70) in the field slot (35b). As a result, the field magnetic flux (M50) of the field winding (50) can be efficiently passed through the first field magnet (70), so that the change in the magnetic force of the first field magnet (70) due to the field magnetic flux (M50) can be facilitated.

[0226] Further, in the rotating electrical machine device (1) of Embodiment 2, the circumferential length (LC70) of the first field magnet (70) is equal to or less than the circumferential length (LC350) of the radially outer portion of the winding accommodating portion (350) in the field slot (35b).

[0227] In the above configuration, when the first field magnet (70) is viewed from the rotation center axis (P) of the rotor (10), the circumferential end portion of the first field magnet (70) can be prevented from protruding from the winding accommodating portion (350). As a result, the generation of fringing magnetic flux at the circumferential end portion of the first field magnet (70) can be suppressed, so that the demagnetization of the first field magnet (70) due to the fringing magnetic flux can be reduced. In this way, the magnetic flux of the first field magnet (70) can be effectively utilized.

[0228] (Embodiment 3) The rotating electrical machine device (1) of Embodiment 3 is different from the rotating electrical machine device (1) of Embodiment 1 in the configuration within the field slot (35b) of the stator (20) of the rotating electrical machine (2). Other configurations of the rotating electrical machine device (1) of Embodiment 3 are the same as those of the rotating electrical machine device (1) of Embodiment 1.

[0229] [Configuration within the field slot] FIG. 21 illustrates the configuration within the field slot (35b) in Embodiment 3. The configuration within the field slot (35b) of Embodiment 3 is different from the configuration within the field slot (35b) of Embodiment 1 in the arrangement of the field winding (50) and the first field magnet (70). Other configurations within the field slot (35b) of Embodiment 3 are the same as those within the field slot (35b) of Embodiment 1.

[0230] In Embodiment 3, the winding accommodating portion (350) is disposed radially outside the second magnet accommodating portion (351). The first magnet accommodating portion (352) is disposed on at least one of both circumferential sides of the winding accommodating portion (350) without being sandwiched between the winding accommodating portions (350). With such a configuration, the field winding (50) is disposed radially outside the second field magnet (60) within the field slot (35b). The first field magnet (70) is disposed on at least one of both circumferential sides of the field winding (50) without being sandwiched between the field windings (50) within the field slot (35b). Further, the first field magnet (70) is magnetized in the radial direction.

[0231] In the example of FIG. 21, the first field magnets (70) are disposed on both circumferential sides of the field winding (50) within the field slot (35b). Thus, two first field magnets (70) are accommodated within one field slot (35b). And the first field magnets (70) are magnetized such that the magnetic pole faces face in the radial direction. In other words, the first field magnets (70) can be magnetized in the radial direction, and the magnetization direction can be set along the radial direction. Note that the forward direction of the first field magnet (70) on the right side of FIG. 21 is the direction from the upper side to the lower side of FIG. 21, and the forward direction of the first field magnet (70) on the left side of FIG. 21 is the direction from the lower side to the upper side of FIG. 21.

[0232] [Operation of the control unit] Similar to the control unit (3) of Embodiment 1, the control unit (3) of Embodiment 3 selectively performs first magnetic force control, second magnetic force control, first rotation control, second rotation control, third rotation control, fourth rotation control, fifth rotation control, and sixth rotation control.

[0233] [Effect of Embodiment 3] In the rotating electrical machine device (1) of Embodiment 3, effects similar to those of the rotating electrical machine device (1) of Embodiment 1 can be obtained. For example, since six operation modes can be realized, the control of the rotating electrical machine (2) can be diversified.

[0234] In the rotating electrical machine device (1) according to Embodiment 3, the field winding (50) is disposed radially outside the second field magnet (60) within the field slot (35b). The first field magnet (70) is disposed at least on one of both circumferential sides of the field winding (50) without being sandwiched between the field windings (50) within the field slot (35b). Further, the first field magnet (70) is magnetized in the radial direction.

[0235] In the above configuration, the first field magnet (70) can be brought closer to the field winding (50) than in the case where the second field magnet (60) is interposed between the field winding (50) and the first field magnet (70) within the field slot (35b). Thereby, the field magnetic flux (M50) of the field winding (50) can be efficiently passed through the first field magnet (70), so that the change in the magnetic force of the first field magnet (70) due to the field magnetic flux (M50) can be facilitated.

[0236] (Embodiment 4) FIG. 22 illustrates the configuration of the rotating electrical machine device (1) according to Embodiment 4. The configuration within the field slot (35b) of the stator (20) of the rotating electrical machine (2) in Embodiment 4 is different from that of the rotating electrical machine device (1) in Embodiment 2. Other configurations of the rotating electrical machine device (1) according to Embodiment 4 are the same as those of the rotating electrical machine device (1) according to Embodiment 2.

[0237] 〔Configuration within the field slot〕 In Embodiment 4, the second field magnet (60) is omitted within the field slot (35b). The first field magnet (70) is disposed radially outside the field winding (50) within the field slot (35b).

[0238] 〔Forward direction and reverse direction〕 The "forward direction" of the magnetization direction of the first field magnet (70) in Embodiment 4 is a predetermined magnetization direction. The "reverse direction" of the magnetization direction of the first field magnet (70) in Embodiment 4 is the reverse direction of the predetermined magnetization direction.

[0239] 〔Operation of the control unit〕 Similar to the control unit (3) of Embodiment 2, the control unit (3) of Embodiment 4 selectively performs first magnetic force control, second magnetic force control, first rotation control, second rotation control, third rotation control, fourth rotation control, fifth rotation control, and sixth rotation control.

[0240] 〔Effect of Embodiment 4〕 In the rotary electric machine device (1) of Embodiment 4, the same effects as those of the rotary electric machine device (1) of Embodiment 2 can be obtained. For example, since six operation modes can be realized, the control of the rotary electric machine (2) can be diversified.

[0241] (Details of Magnetic Force Control) Next, the details of the first magnetic force control and the second magnetic force control in each of Embodiments 1 to 4 will be described. Hereinafter, the general term for Embodiments 1 to 4 will be described as "Embodiment", and the general term for the first magnetic force control and the second magnetic force control will be described as "magnetic force control". The magnetic force control is control for changing the magnetic force of the first field magnet (70) by the field magnetic flux (M50).

[0242] 〔Operation of Control Unit〕 In the magnetic force control, the control unit (3) controls the field current (i50) so that the magnetic force of the first field magnet (70) is changed by the field magnetic flux (M50) during the rotation of the rotor (10).

[0243] Preferably, in the magnetic force control, the control unit (3) controls the field current (i50) so that the magnetic force of the first field magnet (70) is changed by the field magnetic flux (M50) during a period in which the electrical angle of the rotor (10) changes by 180° or more. In this example, the number of pole pairs of the rotary electric machine (2) is 10. For example, when controlling the rotation of the rotor (10) based on the mechanical angle of the rotor (10), the control unit (3) controls the field current (i50) so that the magnetic force of the first field magnet (70) is changed by the field magnetic flux (M50) during a period in which the mechanical angle of the rotor (10) changes by 18° (= 180° / 10) or more.

[0244] More preferably, in magnetic force control, the control unit (3) controls the field current (i50) such that the magnetic force of the first field magnet (70) is changed by the field magnetic flux (M50) during a period in which the electrical angle of the rotor (10) changes by 360° or more. For example, when controlling the rotation of the rotor (10) based on the mechanical angle of the rotor (10), the control unit (3) controls the field current (i50) such that the magnetic force of the first field magnet (70) is changed by the field magnetic flux (M50) during a period in which the mechanical angle of the rotor (10) changes by 36° (= 360° / 10) or more.

[0245] Also preferably, in magnetic force control, the control unit (3) controls the armature current (i40) and the field current (i50) such that the magnetic force of the first field magnet (70) is changed by the field magnetic flux (M50) during a period in which the armature current (i40) is supplied to the armature winding (40).

[0246] In this example, in magnetic force control, the control unit (3) controls the armature current (i40) and the field current (i50) such that the magnetic force of the first field magnet (70) is changed by the field magnetic flux (M50) during a period in which the electrical angle of the rotor (10) changes by 360° or more and during a period in which the armature current (i40) is supplied to the armature winding (40).

[0247] Specifically, the control unit (3) controls the armature current (i40) so that the rotation of the rotor (10) is maintained (continued). Also, as shown in FIG. 23, the control unit (3) controls the field current (i50) so that the field current (i50) becomes a quasi-impulse current having a high-level period equal to or longer than a period (P0) corresponding to one cycle of the electrical angle. The period (P0) is a period in which the electrical angle changes by 360°. When the rotational speed of the rotor (10) is high, the period (P0) is an extremely short time (for example, less than 10 msec). In the example of FIG. 23, the field current (i50) is a quasi-impulse current having a high-level period equal to the period (P0).

[0248] Also, in this example, in magnetic force control, the control unit (3) changes the armature current (i40) in a direction to suppress torque fluctuations caused by the field magnetic flux (M50). For example, when the torque increases due to the field magnetic flux (M50) compared to the case where the field magnetic flux (M50) is not generated, the control unit (3) reduces the armature current (i40) compared to the case where the field magnetic flux (M50) is not generated. Conversely, when the torque decreases due to the field magnetic flux (M50) compared to the case where the field magnetic flux (M50) is not generated, the control unit (3) increases the armature current (i40) compared to the case where the field magnetic flux (M50) is not generated. Thereby, even when the inertia of the load of the rotating electrical machine (2) is small, a stable rotation state of the rotor (10) can be maintained.

[0249] 〔Ease of change in magnetic force of the first field magnet〕 In magnetic force control, the ease of change in the magnetic force of each of the plurality of first field magnets (70) changes depending on the rotational position of the rotor (10). Specifically, due to the positional relationship between the teeth (32) adjacent to the field slots (35b), the teeth (32), and the protrusions (13) of the rotor (10), the ease of change in the magnetic force of the first field magnet (70) within the field slot (35b) changes.

[0250] For example, in the rotating electrical machine device (1) of Embodiment 2, when the protrusion (13) of the rotor (10) is located at the tip of the teeth (32) adjacent to the field slot (35b), the field magnetic flux (M50) easily passes through the first field magnet (70) within the field slot (35b), so the magnetic force of the first field magnet (70) easily changes due to the field magnetic flux (M50). Conversely, when the protrusion (13) of the rotor (10) is not located at the tip of the teeth (32) adjacent to the field slot (35b), the field magnetic flux (M50) hardly passes through the first field magnet (70) within the field slot (35b), so the magnetic force of the first field magnet (70) hardly changes due to the field magnetic flux (M50).

[0251] Further, in the rotary electric machine device (1) of Embodiment 1, when the protrusion (13) of the rotor (10) is located at the tip of the tooth (32) adjacent to the field slot (35b), the field magnetic flux (M50) does not pass through the first field magnet (70) in the field slot (35b) but passes through the rotor (10). Therefore, the magnetic force of the first field magnet (70) is less likely to change due to the field magnetic flux (M50). Conversely, when the protrusion (13) of the rotor (10) is not located at the tip of the tooth (32) adjacent to the field slot (35b), the field magnetic flux (M50) easily passes through the first field magnet (70) in the field slot (35b). Therefore, the magnetic force of the first field magnet (70) is likely to change due to the field magnetic flux (M50).

[0252] As described above, in magnetic force control, the ease of change of the magnetic force of each of the plurality of first field magnets (70) varies depending on the rotational position of the rotor (10). Therefore, if magnetic force control is performed without rotating the rotor (10), the variation in the magnetization state among the first field magnets (70) increases.

[0253] [Comparison between Embodiment and Comparative Example] Next, with reference to FIGS. 24 to 27, the comparison between the embodiment and the comparative example will be described. Hereinafter, the rotary electric machine device (1) of Embodiment 2 will be taken as an example. Further, the comparative example of the rotary electric machine device (1) of Embodiment 2 is described as "rotary electric machine device (9)". For the sake of convenience of explanation, among the components of the rotary electric machine device (9), the components similar to those of the rotary electric machine device (1) of Embodiment 2 are denoted by the same reference numerals as the components of the rotary electric machine device (1) of Embodiment 2.

[0254] The behavior of the rotor (10) in magnetic force control of the rotary electric machine device (9) is different from that of the rotary electric machine device (1) of Embodiment 2. In the rotary electric machine device (9), the rotor (10) does not rotate in magnetic force control. Other configurations of the rotary electric machine device (9) are the same as those of the rotary electric machine device (1) of Embodiment 2.

[0255] FIG. 24 illustrates the magnetization states of a plurality of first field magnets (70) in the rotating electrical machine device (9). In the rotating electrical machine device (9), there is a large variation in the magnetization states among the first field magnets (70). Specifically, the magnetization rate distributions in each of two adjacent first field magnets (70) in the circumferential direction are different from each other. In the rotating electrical machine device (9), the magnetization state within the first field magnet (70) is non-uniform, and the magnetization state among the first field magnets (70) is also non-uniform.

[0256] FIG. 25 illustrates the waveforms of the no-load mutual flux in the rotating electrical machine device (9). In FIG. 25, the solid line indicates the waveform of the mutual flux of the U-phase, the dashed-dotted line indicates the waveform of the mutual flux of the V-phase, and the W-phase indicates the waveform of the mutual flux of the W-phase. In the rotating electrical machine device (9), there is a variation in the peak of the mutual flux of each phase, and the mutual flux is unbalanced.

[0257] FIG. 26 illustrates the magnetization states of a plurality of first field magnets (70) in the rotating electrical machine device (1) of Embodiment 2. In the rotating electrical machine device (1) of Embodiment 2, the variation in the magnetization states among the first field magnets (70) is smaller than the variation in the magnetization states among the first field magnets (70) of the rotating electrical machine device (9). Specifically, the magnetization rate distributions in each of two adjacent first field magnets (70) in the circumferential direction are similar to each other. In the example of FIG. 26, the magnetization rate distributions in each of two adjacent first field magnets (70) in the circumferential direction are line-symmetric about a line extending in the radial direction. In the rotating electrical machine device (1) of Embodiment 2, the magnetization state within the first field magnet (70) is non-uniform, but the magnetization state among the first field magnets (70) can be regarded as uniform.

[0258] Also, the magnetization rate of the first field magnet (70) in the rotating electrical machine device (1) of Embodiment 2 shown in FIG. 26 is about 1.5 times the magnetization rate of the first field magnet (70) in the rotating electrical machine device (9) shown in FIG. 24.

[0259] FIG. 27 illustrates the waveform of the no-load interlinkage magnetic flux in the rotating electrical machine device (1) of Embodiment 2. In FIG. 27, the solid line indicates the waveform of the interlinkage magnetic flux of the U phase, the dashed-dotted line indicates the waveform of the interlinkage magnetic flux of the V phase, and the W phase indicates the waveform of the interlinkage magnetic flux of the W phase. In the rotating electrical machine device (1) of Embodiment 2, the variation in the peak of the interlinkage magnetic flux of each phase is smaller than that of the rotating electrical machine device (9), and the imbalance of the interlinkage magnetic flux is eliminated.

[0260] 〔Effects of Embodiment〕 As described above, in the rotating electrical machine device (1) of the embodiment, in the magnetic force control in which the control unit (3) changes the magnetic force of the first field magnet (70) by the field magnetic flux (M50), during the rotation of the rotor (10), the field current (i50) is controlled so that the magnetic force of the first field magnet (70) is changed by the field magnetic flux (M50). With such a configuration, the variation in the magnetization state between the first field magnets (70) can be reduced. Note that the magnetization state within the first field magnet (70) may be non-uniform.

[0261] Preferably, in the magnetic force control, the control unit (3) controls the field current (i50) so that the magnetic force of the first field magnet (70) is changed by the field magnetic flux (M50) during a period in which the electrical angle of the rotor (10) changes by 180° or more. Due to the magnetic symmetry between the rotor (10) and the stator (20), in principle, the variation in the magnetization state between the first field magnets (70) can be reduced.

[0262] More preferably, in the magnetic force control, the control unit (3) controls the field current (i50) so that the magnetic force of the first field magnet (70) is changed by the field magnetic flux (M50) during a period in which the electrical angle of the rotor (10) changes by 360° or more. With such a configuration, even when the magnetic symmetry between the rotor (10) and the stator (20) is broken by the rotating magnetic field, the variation in the magnetization state between the first field magnets (70) can be reduced. Further, since the electrical angle of the rotor (10) changes by 360° or more, the initial positioning of the rotor (10) at the start of energization of the field current (i50) becomes unnecessary.

[0263] Further, in the rotating electrical machine device (1) of the embodiment, in magnetic force control, during the period when the armature current (i40) is supplied to the armature winding (40), the control unit (3) controls the armature current (i40) and the field current (i50) so that the magnetic force of the first field magnet (70) is changed by the field magnetic flux (M50). With such a configuration, by supplying the armature current (i40) to the armature winding (40) in magnetic force control, the rotation of the rotor (10) can be maintained (continued) in magnetic force control. Thereby, a stable rotation state of the rotor (10) can be maintained in magnetic force control.

[0264] Even if the temperature of the armature winding (40) has risen due to the supply of the armature current (i40) to the armature winding (40), since the field current (i50) is supplied to the field winding (50) instead of the armature winding (40), it does not affect the temperature rise of the armature winding (40).

[0265] Further, in the rotating electrical machine device (1) of the embodiment, in magnetic force control, the control unit (3) changes the armature current (i40) in a direction to suppress torque fluctuations caused by the field magnetic flux (M50). With such a configuration, torque fluctuations caused by the field magnetic flux (M50) can be suppressed in magnetic force control. Thereby, a stable rotation state of the rotor (10) can be maintained in magnetic force control.

[0266] Further, in the rotating electrical machine device (1) of Embodiment 2 and Embodiment 4, the first field magnet (70) is arranged radially outside (the side farther from the rotor (10)) of the field winding (50) within the field slot (35b). With such a configuration, the change in the magnetic force of the first field magnet (70) due to the field magnetic flux (M50) can be facilitated more easily than when the first field magnet (70) is arranged radially inside (the side closer to the rotor (10)) of the field winding (50).

[0267] Also, in the rotating electrical machine device (1) according to Embodiments 1 to 3, the stator (20) has the second field magnet (60) accommodated in the field slot (35b). With such a configuration, even when the magnetic force of the first field magnet (70) is substantially zero, the second field magnet (60) can provide a magnetic flux (M60) in a certain direction.

[0268] (Modification Example 1 of Magnetic Force Control) Note that the control unit (3) may control the field current (i50) so that the magnitude of the magnetic force of the first field magnet (70) is changed while the direction of the magnetic force of the first field magnet (70) is maintained in magnetic force control.

[0269] With the above configuration, the field current (i50) required to change the magnetic force of the first field magnet (70) can be reduced compared to the case where the field current (i50) is controlled so that the direction of the magnetic force of the first field magnet (70) is changed.

[0270] For example, in the rotating electrical machine device (1) according to Embodiment 4, since the second field magnet (60) is omitted, it is desirable that the first field magnet (70) is always magnetized in the same direction. Therefore, it is desirable that only the magnitude of the magnetic force of the first field magnet (70) is changed while the direction of the magnetic force of the first field magnet (70) is maintained. In other words, it can be considered that there are a fixed field portion and a variable field portion inside the first field magnet (70).

[0271] Note that as long as the direction of the magnetic force of the first field magnet (70) is maintained, the direction of the magnetic force may be partially reversed instead of being maintained inside the first field magnet (70).

[0272] (Modification Example 1 of Waveform of Field Current) As shown in FIG. 28, the control unit (3) may control the field current (i50) so that the field current (i50) becomes a plurality of pulses continuous at a predetermined interval in a period (P0) equal to or longer than a period corresponding to one electrical angle cycle in magnetic force control.

[0273] In the example of FIG. 28, the period including a plurality of pulses continuous at a predetermined interval is equivalent to the period (P0) in which the field current (i50) corresponds to one electrical angle cycle.

[0274] (Modification Example 2 of the Waveform of the Field Current) As shown in FIG. 29, in magnetic force control, the control unit (3) may control the field current (i50) such that a plurality of pulses (pulses that become the field current (i50)) are continuous at a predetermined interval for each of a plurality of periods (P1, P2, P3) each corresponding to one electrical angle cycle, and the phases of the plurality of pulses are shifted for each of the plurality of periods (P1, P2, P3).

[0275] In the example of FIG. 28, four pulses are continuous at intervals of time (Δtp) in each of the three periods (P1, P2, P3). The four pulses included in the second period (P2) are delayed by the first time (Δt1) compared to the four pulses included in the first period (P1). The four pulses included in the third period (P3) are delayed by the second time (Δt2) compared to the four pulses included in the first period (P1). The second time (Δt2) is twice the first time (Δt1), and the time (Δtp) is three times the first time (Δt1). By such control, twelve pulses continuous at intervals of the first time (Δt1) in one electrical angle cycle can be distributed to the three periods (P1, P2, P3).

[0276] (Modification Example 2 of Magnetic Force Control) In Embodiments 2 and 4 (specifically, when the first field magnet (70) is arranged radially outside the field winding (50) in the field slot (35b)), the following magnetic force control may be performed.

[0277] As shown in FIG. 30, in magnetic force control, during the rotation of the rotor (10), the control unit (3) may control the field current (i50) such that the magnetic force of the first field magnet (70) is changed by the field magnetic flux (M50) by flowing a pulsed field current (i50) in the first period (PP1), the second period (PP2), and the third period (PP3).

[0278] Note that the first period (PP1) is a period during which the electrical angle of the rotor (10) is within a first range including 0°. For example, the first range is a range obtained by adding an error (e.g., ±5°) to 0°. The second period (PP2) is a period during which the electrical angle of the rotor (10) is within a second range including 120°. For example, the second range is a range obtained by adding an error (e.g., ±5°) to 120°. The third period (PP3) is a period during which the electrical angle of the rotor (10) is within a third range including 240°. For example, the first range is a range obtained by adding an error (e.g., ±5°) to 240°.

[0279] 〔Relationship between Electrical Angle of Rotor and Efficiency of Magnetic Force Control〕 Here, with reference to FIGS. 31, 32, and 33, the case where the electrical angle of the rotor (10) is 0° will be described. Hereinafter, the stator winding (40) of the U phase will be described as the "U-phase winding (U)", the stator winding (40) of the V phase will be described as the "V-phase winding (V)", and the stator winding (40) of the W phase will be described as the "W-phase winding (W)".

[0280] FIG. 31 illustrates the position of the rotor (10) when the electrical angle of the rotor (10) is 0°. FIG. 32 illustrates a linear development of the first region (Ra) of the rotating electrical machine (2) when the electrical angle of the rotor (10) is 0°. FIG. 33 illustrates the magnetic circuit formed in the rotating electrical machine (2) when the electrical angle of the rotor (10) is 0°.

[0281] As shown in FIG. 32, when the electrical angle of the rotor (10) is 0°, the magnetic flux linkage number of the U phase becomes maximum in the forward direction. Also, the protrusion (13) of the rotor (10) completely faces the stator slots (35a) in which the V-phase winding (V) and the W-phase winding (W) are accommodated. Specifically, the center line in the circumferential direction of the stator slot (35a) and the center line in the circumferential direction of the protrusion (13) of the rotor (10) coincide. Note that the circumferential length of the protrusion (13) of the rotor (10) is longer than the circumferential length of the stator slot (35a).

[0282] As shown in FIG. 33, a magnetic circuit is formed around the field winding (50) in the field slot (35b) disposed between two armature slots (35a) that accommodate the W-phase winding (W). When the electrical angle of the rotor (10) is 0°, since the facing area between the rotor (10) and the stator (20) in the magnetic circuit is relatively large, the magnetic resistance (R1) of the gap (G) in the magnetic circuit is relatively small. Therefore, the magnetic field intensity of the first field magnet (70) in the field slot (35b) disposed between two armature slots (35a) that accommodate the W-phase winding (W) becomes maximum.

[0283] Next, with reference to FIGS. 31, 34, and 35, the case where the electrical angle of the rotor (10) is 180° will be described. In this example, the rotation direction of the rotor (10) is the counterclockwise direction in FIG. 31. The position of the rotor (10) when the electrical angle of the rotor (10) is 180° is the position rotated counterclockwise by 18° in mechanical angle from the position shown in FIG. 31.

[0284] FIG. 34 exemplifies a linear development of the second region (Rb) of the rotary electric machine (2) when the electrical angle of the rotor (10) is 180°. FIG. 35 exemplifies the magnetic circuit formed in the rotary electric machine (2) when the electrical angle of the rotor (10) is 180°.

[0285] As shown in FIG. 34, when the electrical angle of the rotor (10) is 180°, the number of magnetic flux linkages of the U-phase becomes maximum in the reverse direction. Also, the protrusion (13) of the rotor (10) completely faces the armature slots (35a) that accommodate the V-phase winding (V) and the W-phase winding (W). Specifically, the center line in the circumferential direction of the armature slot (35a) and the center line in the circumferential direction of the protrusion (13) of the rotor (10) coincide.

[0286] As shown in FIG. 35, a magnetic circuit is formed around the field winding (50) in the field slot (35b) disposed between two armature slots (35a) that accommodate the W-phase winding (W). When the electrical angle of the rotor (10) is 180°, since the facing area between the rotor (10) and the stator (20) in the magnetic circuit is relatively small, the magnetic resistance (R2) of the gap (G) in the magnetic circuit is relatively large. Therefore, the magnetic field intensity of the first field magnet (70) in the field slot (35b) disposed between two armature slots (35a) that accommodate the W-phase winding (W) becomes minimum.

[0287] Also, similar to the above-described field slot (35b), the magnetic field intensity of the first field magnet (70) in the field slot (35b) disposed between two armature slots (35a) that accommodate the U-phase winding (U) becomes maximum when the electrical angle of the rotor (10) is 120°, and becomes minimum when the electrical angle of the rotor (10) is 300°. Further, the magnetic field intensity of the first field magnet (70) in the field slot (35b) disposed between two armature slots (35a) that accommodate the V-phase winding (V) becomes maximum when the electrical angle of the rotor (10) is 240°, and becomes minimum when the electrical angle of the rotor (10) is 60° (= 240° + 180° - 360°).

[0288] As described above, as the electrical angle of the rotor (10) approaches 0°, 120°, and 240°, the magnetic field intensity of the first field magnet (70) gradually increases. Also, as the electrical angle of the rotor (10) approaches 180°, 300°, and 60°, the magnetic field intensity of the first field magnet (70) gradually decreases.

[0289] Therefore, in magnetic force control, by flowing a pulsed field current (i50) during "a first period (PP1) within a first range including an electrical angle of 0° of the rotor (10)", "a second period (PP2) within a second range including an electrical angle of 120° of the rotor (10)", and "a third period (PP3) within a third range including an electrical angle of 240° of the rotor (10)", the magnetic force of the first field magnet (70) can be efficiently changed.

[0290] 〔Comparison between Modification Example 2 of Magnetic Force Control and Comparative Example〕 Next, with reference to FIG. 36, Modification Example 2 of magnetic force control and its comparative example will be described in comparison. In the following, for the sake of convenience of explanation, among the components of the rotating electrical machine device serving as the comparative example, the components similar to those of the rotating electrical machine device (1) of the embodiment (Modification Example 2 of magnetic force control) are denoted by the same reference numerals as those of the components of the rotating electrical machine device (1) of the embodiment.

[0291] In the rotating electrical machine device serving as the comparative example, magnetic force control is performed without rotating the rotor (10). On the other hand, in Modification Example 2 of magnetic force control, magnetic force control is performed during the rotation of the rotor (10).

[0292] In FIG. 36, curve (L1) illustrates the relationship between the magnetization current density and the magnetization rate of the induced voltage in Modification Example 2 of magnetic force control. Polarity (L9) illustrates the relationship between the magnetization current density and the magnetization rate of the induced voltage in the comparative example. The magnetization current density corresponds to the current density of the field current (i50) supplied to the field winding (50). The magnetization rate of the induced voltage corresponds to the average of the magnetization rates of the plurality of first field magnets (70).

[0293] In the comparative example, since magnetic force control is performed without rotating the rotor (10), it is difficult to magnetize the plurality of first field magnets (70) uniformly. Therefore, the magnetization rate of the induced voltage in the comparative example is lower than that in Modification Example 2 of magnetic force control.

[0294] On the other hand, in Modification Example 2 of magnetic force control, magnetic force control is performed during the rotation of the rotor (10). Specifically, in the "first period (PP1) in which the electrical angle of the rotor (10) is within the first range including 0°", the "second period (PP2) in which the electrical angle of the rotor (10) is within the second range including 120°", and the "third period (PP3) in which the electrical angle of the rotor (10) is within the third range including 240°", a pulsed field current (i50) flows. Thereby, the plurality of first field magnets (70) can be magnetized more appropriately than in the comparative example.

[0295] 〔Effect of Modification Example 2 of Magnetic Force Control〕 As described above, in magnetic force control, during the rotation of the rotor (10), the control unit (3) controls the field current (i50) such that a pulsed field current (i50) flows during a first period in which the electrical angle of the rotor (10) is within a first range including 0°, a second period in which the electrical angle of the rotor (10) is within a second range including 120°, and a third period in which the electrical angle of the rotor (10) is within a third range including 240°, and the magnetic force of the first field magnet (70) is changed by the field magnetic flux (M50). By such control, the change in the magnetic force of the first field magnet (70) can be performed efficiently.

[0296] (Modification Example 3 of Magnetic Force Control) In Embodiments 2 and 4 (specifically, when the first field magnet (70) is arranged radially outside the field winding (50) in the field slot (35b)), the magnetic force control may be switched according to the rotational speed of the rotor (10).

[0297] In this modification example 3, when the rotational speed of the rotor (10) is below the threshold value, as shown in FIG. 30, in magnetic force control, during the rotation of the rotor (10), the control unit (3) controls the field current (i50) such that a pulsed field current (i50) flows during a first period (PP1), a second period (PP2), and a third period (PP3), and the magnetic force of the first field magnet (70) is changed by the field magnetic flux (M50). Also, when the rotational speed of the rotor (10) is not below the threshold value, as shown in FIG. 37, the control unit (3) controls the field current (i50) such that the magnetic force of the first field magnet (70) is changed by the field magnetic flux (M50) during the rotation of the rotor (10).

[0298] Note that the integral value of the field current (i50) at the angle during one cycle of the electrical angle of the rotor (10) in the magnetic force control performed when the rotational speed of the rotor (10) is below the threshold value is smaller than the integral value of the field current (i50) at the angle during one cycle of the electrical angle of the rotor (10) in the magnetic force control performed when the rotational speed of the rotor (10) is not below the threshold value.

[0299] [Relationship between the Rotation Speed of the Rotor and the Energization Time of the Field Winding] When the rotation speed of the rotor (10) is low, if a direct current field current (i50) is continuously supplied to the field winding (50) for magnetic force control, the energization time of the field winding (50) becomes long, and as a result, the temperature of the components of the stator (20) may rise. Examples of magnetic force control performed when the rotation speed of the rotor (10) is low include magnetic force control performed immediately after starting the rotary electric machine (2). For example, when it is unknown what the magnetization state of the first field magnet (70) is before starting the rotary electric machine (2), magnetic force control is performed immediately after starting the rotary electric machine (2) in order to set the magnetization state of the first field magnet (70) to a predetermined initial state.

[0300] On the other hand, when the rotation speed of the rotor (10) is high, even if the field current (i50) is continuously passed through the field winding (50) during a period corresponding to one cycle of the electrical angle of the rotor (10), the energization time of the field winding (50) is short, so the temperature rise of the components of the stator (20) due to the energization of the field winding (50) is not a problem.

[0301] [Effect of Modification Example 3 of Magnetic Force Control] As described above, when the rotation speed of the rotor (10) is below the threshold value, the control unit (3) controls the field current (i50) so that a pulsed field current (i50) flows in the first period (PP1), the second period (PP2), and the third period (PP3) during the rotation of the rotor (10) in magnetic force control, and the magnetic force of the first field magnet (70) is changed by the field magnetic flux (M50). Further, when the rotation speed of the rotor (10) is not below the threshold value, the control unit (3) controls the field current (i50) so that the magnetic force of the first field magnet (70) is changed by the field magnetic flux (M50) during the rotation of the rotor (10) in magnetic force control. By such control, magnetic force control can be appropriately performed according to the rotation speed of the rotor (10).

[0302] (Compressor) FIG. 38 illustrates the configuration of a compressor (CC). The compressor (CC) includes a rotary electric machine device (1), a casing (CC1), and a compression mechanism (CC2).

[0303] The casing (CC1) houses the compression mechanism (CC2) and the rotary electric machine (2). In this example, the casing (CC1) is formed in a cylindrical shape that extends in the vertical direction and has closed ends. The casing (CC1) is provided with a suction pipe (CC11) and a discharge pipe (CC12). The suction pipe (CC11) penetrates the body of the casing (CC1) and is connected to the compression mechanism (CC2). The discharge pipe (CC12) penetrates the upper part of the casing (CC1) and communicates with the internal space of the casing (CC1).

[0304] The compression mechanism (CC2) compresses a fluid. In this example, the compression mechanism (CC2) is disposed below the rotary electric machine (2). The compression mechanism (CC2) compresses the fluid inhaled through the suction pipe (CC11) and discharges the compressed fluid into the internal space of the casing (CC1). The fluid discharged into the internal space of the casing (CC1) is discharged through the discharge pipe (CC12). In this example, the compression mechanism (CC2) is a rotary compression mechanism.

[0305] The shaft (4) connects the rotary electric machine (2) and the compression mechanism (CC2). In this example, the shaft (4) extends in the vertical direction. The rotary electric machine (2) rotationally drives the shaft (4). By the rotational drive of the shaft (4), the compression mechanism (CC2) is driven.

[0306] (Refrigeration device) FIG. 39 illustrates the configuration of a refrigeration device (RR). The refrigeration device (RR) includes a refrigerant circuit (RR1) through which a refrigerant circulates. In this example, the refrigeration device (RR) constitutes an air conditioner. Specifically, the refrigerant circuit (RR1) includes a compressor (CC) having a rotary electric machine device (1), a first heat exchanger (RR5), a second heat exchanger (RR6), an expansion mechanism (RR7), and a four-way switching valve (RR8).

[0307] The compressor (CC) compresses the refrigerant and discharges the compressed refrigerant. The discharge side of the compressor (CC) is connected to the first port of the four-way switching valve (RR8). The suction side of the compressor (CC) is connected to the second port of the four-way switching valve (RR8).

[0308] The first heat exchanger (RR5) exchanges heat between the refrigerant and air. The gas end of the first heat exchanger (RR5) is connected to the third port of the four-way switching valve (RR8). The liquid end of the first heat exchanger (RR5) is connected to the liquid end of the second heat exchanger (RR6) via the expansion mechanism (RR7). For example, the first heat exchanger (RR5) is a heat source heat exchanger and is provided outdoors.

[0309] The second heat exchanger (RR6) exchanges heat between the refrigerant and air. The gas end of the second heat exchanger (RR6) is connected to the fourth port of the four-way switching valve (RR8). For example, the second heat exchanger (RR6) is a utilization heat exchanger and is provided indoors.

[0310] The expansion mechanism (RR7) expands the refrigerant to reduce the pressure. For example, the expansion mechanism (RR7) is an electronic expansion valve.

[0311] The four-way switching valve (RR8) can be switched between a first state (the state shown by the solid line in FIG. 39) in which the first port and the third port communicate with each other and the second port and the fourth port communicate with each other, and a second state (the state shown by the broken line in FIG. 39) in which the first port and the fourth port communicate with each other and the second port and the third port communicate with each other.

[0312] When the four-way switching valve (RR8) is in the first state, the refrigerant discharged from the compressor (CC) dissipates heat in the first heat exchanger (RR5), is depressurized in the expansion mechanism (RR7), and then absorbs heat in the second heat exchanger (RR6). The refrigerant flowing out of the second heat exchanger (RR6) is inhaled by the compressor (CC).

[0313] When the four-way switching valve (RR8) is in the second state, the refrigerant discharged from the compressor (CC) dissipates heat in the second heat exchanger (RR6), is depressurized in the expansion mechanism (RR7), and then absorbs heat in the first heat exchanger (RR5). The refrigerant flowing out of the first heat exchanger (RR5) is inhaled by the compressor (CC).

[0314] (Vehicle) Figure 40 illustrates the configuration of a vehicle (VV). The vehicle (VV) includes a rotary electric machine device (1), a wheel (VV1), and a power transmission mechanism (VV2). The power transmission mechanism (VV2) transmits the rotational force of the rotary electric machine (2) to the wheel (VV1). When the rotary electric machine (2) rotates, the rotational force of the rotary electric machine (2) is transmitted to the wheel (VV1) through the power transmission mechanism (VV2), and the wheel (VV1) rotates.

[0315] (Other embodiments) Note that the various magnetic flux flows shown in FIGS. 3 to 10 and FIGS. 13 to 20 are merely examples, and various magnetic flux paths may differ according to the rotational position of the rotor (10) (for example, the position of the protrusion (13)). However, even if the rotational position of the rotor (10) changes, the various magnetic fluxes flow through the rotor (10) and act on the rotor (10) as the field magnetic flux.

[0316] Also, in the above description, the rotational speed of the rotor (10) in magnetic force control may be constant or may vary. For example, the control unit (3) stops the rotor (10) for a time corresponding to the first period (PP1) at a position where the electrical angle of the rotor (10) is within a first range including 0°, stops the rotor (10) for a time corresponding to the second period (PP2) at a position where the electrical angle of the rotor (10) is within a second range including 120°, and stops the rotor (10) for a time corresponding to the third period (PP3) at a position where the electrical angle of the rotor (10) is within a third range including 240°, and may control the operation of the rotary electric machine (2).

[0317] In the above description, the rotary electric machine (2) constitutes an inner rotor type motor. Therefore, the radially outer side is the side far from the rotor (10), and the radially inner side is the side close to the rotor (10).

[0318] In the above description, the case where the rotary electric machine (2) constitutes an inner rotor type motor has been taken as an example, but it is not limited thereto. For example, the rotary electric machine (2) may constitute an outer rotor type motor.

[0319] In the above description, the case where the control unit (3) controls the rotary electric machine (2) based on the outputs of various sensors (not shown) that detect various parameters of the rotary electric machine (2) has been taken as an example, but it is not limited thereto. For example, the control unit (3) may control the rotary electric machine (2) by sensorless operation.

[0320] In the above description, the case where the rotary electric machine (2) constitutes a motor has been taken as an example, but the rotary electric machine (2) may constitute a generator.

[0321] In the above description, the case where the rotor core (11) and the stator core (30) are constituted by laminated cores has been taken as an example, but it is not limited thereto. For example, the rotor core (11) and the stator core (30) may be constituted by a dust core containing an insulator.

[0322] In the above description, the case where the through hole (15) into which the shaft (4) is inserted is provided at the center of the rotor core (11) has been taken as an example, but it is not limited thereto. For example, the shaft (4) may be attached to end plates (not shown) provided on both axial sides of the rotor core (11). In this case, the through hole (15) is unnecessary.

[0323] In the above description, the case where the first field magnet (70) is arranged radially outside the second field magnet (60) within the field slot (35b) has been taken as an example, but the present invention is not limited thereto. For example, the first field magnet (70) may be arranged radially inside the second field magnet (60) within the field slot (35b).

[0324] In the above description, the case where the winding accommodating portion (350), the first magnet accommodating portion (352), and the second magnet accommodating portion (351) communicate with each other in the field slot (35b) has been taken as an example, but the present invention is not limited thereto. For example, the winding accommodating portion (350), the first magnet accommodating portion (352), and the second magnet accommodating portion (351) may be configured to be adjacent to each other with a thin wall portion (not shown) therebetween. In other words, the winding accommodating portion (350), the first magnet accommodating portion (352), and the second magnet accommodating portion (351) may be independent slots from each other, and the field slot (35b) may be an aggregate of these slots.

[0325] Although the embodiments and modifications have been described, it will be understood that various changes in form and details can be made without departing from the spirit and scope of the claims. Also, the above embodiments and modifications may be combined or replaced as appropriate as long as the functions of the object of the present disclosure are not impaired.

Industrial Applicability

[0326] As described above, the present disclosure is useful as a rotating electrical machine device, a compressor, a refrigeration device, and a vehicle.

Explanation of Reference Numerals

[0327] 1 Rotating electrical machine device 2 Rotating electrical machine 3 Control unit 4 Shaft 10 Rotor 20 Stator 30 Stator core 35 Slot 35a Armature slot 35b Field slot 350 Coil storage part 351 Second magnet storage part 352 First magnet storage part 40 Armature winding 50 Field winding 70 First field magnet 60 Second field magnet

Claims

1. A rotating electrical machine (2) having a rotor (10) and a stator (20) facing the rotor (10) with a predetermined gap (G), and a control unit (3), wherein the stator (20) includes a stator core (30) provided with armature slots (35a) and field slots (35b) arranged alternately in the circumferential direction, an armature winding (40) accommodated in the armature slots (35a), and a field winding (50) and a first field magnet (70) accommodated in the field slots (35b); the armature winding (40) generates a rotating magnetic field that rotates the rotor (10) when an alternating armature current (i40) is supplied; the field winding (50) generates a field magnetic flux (M50) when a direct current field current (i50) is supplied; the first field magnet (70) can change its magnetic force by the field magnetic flux (M50); the control unit (3) controls the field current (i50) so that the magnetic force of the first field magnet (70) is changed by the field magnetic flux (M50) during rotation of the rotor (10) in magnetic force control for changing the magnetic force of the first field magnet (70) by the field magnetic flux (M50); the control unit (3) controls the field current (i50) so that the magnetic force of the first field magnet (70) is changed by the field magnetic flux (M50) during a period in which the electrical angle of the rotor (10) changes by 180° or more in the magnetic force control; A rotating electrical machine device.

2. In the rotating electrical machine device according to Claim 1, the control unit (3) controls the field current (i50) so that the magnetic force of the first field magnet (70) is changed by the field magnetic flux (M50) during a period in which the electrical angle of the rotor (10) changes by 360° or more in the magnetic force control; A rotating electrical machine device.

3. In the rotating electrical machine device according to Claim 1 or 2, the control unit (3) controls the armature current (i40) and the field current (i50) so that the magnetic force of the first field magnet (70) is changed by the field magnetic flux (M50) during a period in which the armature current (i40) is supplied to the armature winding (40) in the magnetic force control; A rotating electrical machine device.

4. In any one of the rotating electrical machine devices according to Claims 1 to 3, In the magnetic force control, the control unit (3) controls the field current (i50) such that the magnitude of the magnetic force of the first field magnet (70) is changed while the direction of the magnetic force of the first field magnet (70) is maintained. Rotating electrical machine device.

5. In the rotating electrical machine device according to any one of Claims 1 to 4, in the magnetic force control, the control unit (3) changes the armature current (i40) in a direction to suppress torque fluctuations caused by the field magnetic flux (M50). Rotating electrical machine device.

6. In the rotating electrical machine device according to any one of Claims 1 to 5, the first field magnet (70) is disposed on a side farther from the rotor (10) than the field winding (50) within the field slot (35b). Rotating electrical machine device.

7. In the rotating electrical machine device according to any one of Claims 1 to 6, the stator (20) has a second field magnet (60) accommodated in the field slot (35b). Rotating electrical machine device.

8. A rotating electrical machine (2) having a rotor (10) and a stator (20) facing the rotor (10) with a predetermined gap (G) therebetween, and a control unit (3), wherein the stator (20) includes a stator core (30) provided with armature slots (35a) and field slots (35b) arranged alternately in the circumferential direction, an armature winding (40) accommodated in the armature slots (35a), and a field winding (50) and a first field magnet (70) accommodated in the field slots (35b), the armature winding (40) generates a rotating magnetic field that rotates the rotor (10) when an alternating armature current (i40) is supplied, the field winding (50) generates a field magnetic flux (M50) when a direct current field current (i50) is supplied, the first field magnet (70) can change its magnetic force by the field magnetic flux (M50), in the magnetic force control for changing the magnetic force of the first field magnet (70) by the field magnetic flux (M50), the control unit (3) controls the field current (i50) such that the magnetic force of the first field magnet (70) is changed by the field magnetic flux (M50) during rotation of the rotor (10), the first field magnet (70) is disposed on a side farther from the rotor (10) than the field winding (50) within the field slot (35b). In the magnetic force control, the control unit (3) controls the field current (i50) such that a pulsed field current (i50) flows during rotation of the rotor (10) in a first period in which the electrical angle of the rotor (10) is within a first range including 0°, a second period in which the electrical angle is within a second range including 120°, and a third period in which the electrical angle is within a third range including 240°, and the magnetic force of the first field magnet (70) is changed by the field magnetic flux (M50). Rotating electrical machine device.

9. In the rotating electrical machine device according to Claim 8, the control unit (3) is when the rotational speed of the rotor (10) is lower than a threshold value, in the magnetic force control, during rotation of the rotor (10), the field current (i50) is controlled such that a pulsed field current (i50) flows in the first period, the second period, and the third period, and the magnetic force of the first field magnet (70) is changed by the field magnetic flux (M50). when the rotational speed of the rotor (10) is not lower than the threshold value, in the magnetic force control, during rotation of the rotor (10), the field current (i50) is controlled such that the magnetic force of the first field magnet (70) is changed by the field magnetic flux (M50). Rotating electrical machine device.

10. A compressor including the rotating electrical machine device according to any one of Claims 1 to 9.

11. A refrigeration device including the compressor according to Claim 10.

12. A vehicle including the rotating electrical machine device according to any one of Claims 1 to 9.

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