Motor

Abstract

A motor (100) is provided with a stator (10) and a rotor (20). The stator has a plurality of first teeth (11b) arranged at intervals in the circumferential direction, and an armature winding (12) wound around each of the plurality of first teeth. And the armature winding is an annular junction wire (13). A DC power supply (50) is connected to one end and the other end of the loop-shaped junction wire. On each of the plurality of first teeth, magnetic poles of the same polarity are formed by a direct current flowing through the armature winding. The rotor has a rotor core (21) and a plurality of permanent magnets (22). The rotor core has an outer diameter surface (21a) facing the outside in the radial direction, and an inner diameter surface (21b) which is a surface opposite to the outer diameter surface in the radial direction. The outer diameter surface of the rotor core is provided with a plurality of salient poles (21e) forming first magnetic poles. The plurality of salient poles are arranged at intervals in the circumferential direction.

Description

Technical Field

[0001] The present disclosure relates to an electric machine. Background Art

[0002] For example, a motor is described in Japanese Patent Publication No. 2012-110213 (Patent Document 1). The motor described in Patent Document 1 is an alternating pole motor. The alternating pole motor has a rotor, in which a first pole consisting of a permanent magnet and a second pole consisting of a part of a rotor core are alternately arranged along the circumferential direction. The motor described in Patent Document 1 can reduce the number of permanent magnets by half, so it is advantageous from the perspective of cost reduction and avoiding resource risks. However, in the motor described in Patent Document 1, due to the characteristics of the permanent magnet, the excitation flux remains almost constant, so it is disadvantageous in the case of constant output operation.

[0003] For example, Japanese Patent Application Publication No. 2007-252071 (Patent Document 2) describes a motor. The motor described in Patent Document 2 is also an alternating pole motor. In the motor described in Patent Document 2, the rotor has an excitation winding. Therefore, in the motor described in Patent Document 2, unlike the motor described in Patent Document 1, the excitation amount can be appropriately adjusted according to the operating point of the operation.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2012-110213

[0007] Patent Document 2: Japanese Patent Application Publication No. 2007-252071 Summary of the invention

[0008] Problem that the invention aims to solve

[0009] However, the motor described in Patent Document 2 requires an excitation winding, so the structure becomes complicated and the productivity is reduced. The present disclosure is made in view of the above-mentioned problems of the prior art. More specifically, the present disclosure provides a motor that can expand the operating range by adjusting the excitation flux without using an excitation winding.

[0010] Means used to solve problems

[0011] The motor disclosed in the present invention comprises a stator and a rotor. The stator has a plurality of first teeth arranged at intervals in the circumferential direction, and an armature winding wound around each of the plurality of first teeth. The armature winding is a ring-shaped wire. A DC power supply is connected to one end and the other end of the ring-shaped wire. At each of the plurality of first teeth, a magnetic pole of the same polarity is formed by a DC current flowing through the armature winding. The rotor has a rotor core and a plurality of permanent magnets. The rotor core has an outer diameter surface facing outward in the radial direction, and an inner diameter surface, which is the opposite surface of the outer diameter surface in the radial direction. The rotor core has a plurality of salient poles forming a first magnetic pole on the outer diameter surface. The plurality of salient poles are arranged at intervals in the circumferential direction. The plurality of permanent magnets are respectively mounted on the outer diameter surface in a manner of being located between two adjacent salient poles among the plurality of salient poles in the circumferential direction, and form a second magnetic pole. The plurality of salient poles and the plurality of permanent magnets are opposite to the stator in the radial direction with a gap therebetween.

[0012] Effects of the Invention

[0013] According to the motor of the present disclosure, the operable range can be expanded by adjusting the field flux without using a field winding. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a cross-sectional view of the motor 100 .

[0015] Figure 2 yes Figure 1 Cross-sectional view at II-II in FIG.

[0016] Figure 3 is a schematic circuit diagram of the electric machine 100 .

[0017] Figure 4 It is a cross-sectional view of the motor 100A.

[0018] Figure 5 is a schematic circuit diagram of the motor 100B.

[0019] Figure 6 It is a cross-sectional view showing an example of the rotor 20 in the motor 100C.

[0020] Figure 7 It is a cross-sectional view showing another example of the rotor 20 in the motor 100C.

[0021] Figure 8 1 is a cross-sectional view of the rotor 20 in the motor 100D.

[0022] Fig. 9 is a perspective view of the rotor 20 in the motor 200 . DETAILED DESCRIPTION

[0023] The details of the embodiments of the present disclosure will be described with reference to the drawings. In the following drawings, the same or corresponding parts are given the same reference numerals, and repeated description will not be repeated.

[0024] Implementation method 1.

[0025] The motor according to Embodiment 1 will be described. The motor according to Embodiment 1 is referred to as motor 100 .

[0026] (Structure of Motor 100)

[0027] Next, the structure of the motor 100 will be described.

[0028] Figure 1 is a cross-sectional view of the motor 100 . Figure 1 FIG. 1 shows a cross section of the motor 100 that is perpendicular to the axial direction. Figure 1 In the figure, the housing 40 is omitted. Figure 2 yes Figure 1 The cross-sectional view at II-II in FIG. Figure 1 and Figure 2 As shown, the motor 100 has a stator 10, a rotor 20, a shaft 30, and a housing 40. In addition, the axial direction is the direction of the central axis of the shaft 30, and the radial direction is the direction passing through the central axis of the shaft 30 and orthogonal to the axial direction. In addition, the circumferential direction is the direction of the circumference of the center axis of the shaft 30.

[0029] The stator 10 has a stator core 11 and an armature winding 12. The stator core 11 is formed of a magnetic body. The stator core 11 has a core back 11a and a plurality of teeth 11b. The core back 11a is annular and extends in the circumferential direction. The teeth 11b protrude radially inward from the inner diameter surface of the core back 11a. The plurality of teeth 11b are arranged at intervals in the circumferential direction. The teeth 11b forming the U pole are set as teeth 11ba. The teeth 11b forming the V pole are set as teeth 11bb. The teeth 11b forming the W pole are set as teeth 11bc. Figure 1 and Figure 2 In the example shown, the number of teeth 11b is six.

[0030] The number of teeth 11ba, the number of teeth 11bb, and the number of teeth 11bc are equal to each other. Figure 1 and Figure 2 In the example shown, the number of teeth 11ba, the number of teeth 11bb, and the number of teeth 11bc are each 2. The teeth 11ba, the teeth 11bb, and the teeth 11bc are arranged in this order, for example, in the counterclockwise direction.

[0031] The armature winding 12 is formed of a conductive material. The armature winding 12 is formed of, for example, copper or a copper alloy. The armature winding 12 is wound around each of the plurality of teeth 11b. The portion of the armature winding 12 wound around the tooth 11ba is set as a winding portion 12a. The portion of the armature winding 12 wound around the tooth 11bb is set as a winding portion 12b. The portion of the armature winding 12 wound around the tooth 11bc is set as a winding portion 12c. The winding direction of the winding portion 12a, the winding direction of the winding portion 12b, and the winding direction of the winding portion 12c are the same as each other.

[0032] Figure 3 is a schematic circuit diagram of the motor 100. Figure 3 As shown, the winding portion 12a, the winding portion 12b and the winding portion 12c constitute a ring-shaped knot 13. A DC power supply 50 is connected to one end and the other end of the ring-shaped knot 13. Through the DC power supply 50, a DC current flows in the ring-shaped knot 13. The DC current flowing through the ring-shaped knot 13 can be adjusted by the DC power supply 50. As described above, the winding direction of the winding portion 12a, the winding direction of the winding portion 12b, and the winding direction of the winding portion 12c are the same as each other. Therefore, by this DC current, the tooth 11ba, the tooth 11bb, and the tooth 11bc become magnetic poles of the same polarity as each other.

[0033] The connecting wire 14a is connected between the winding part 12a and the winding part 12b. The connecting wire 14b is connected between the winding part 12a and the winding part 12c. The connecting wire 14c is connected between the winding part 12b and the DC power supply 50. The three-phase AC power supply (not shown) is electrically connected to the ring connection 13 through the connecting wires 14a, 14b, and 14c.

[0034] like Figure 1 and Figure 2 As shown, the rotor 20 has a rotor core 21 and a plurality of permanent magnets 22. The rotor core 21 is formed of a magnetic body. The rotor core 21 has an outer diameter surface 21a and an inner diameter surface 21b. The outer diameter surface 21a and the inner diameter surface 21b extend in the circumferential direction. The outer diameter surface 21a faces radially outward. The outer diameter surface 21a is opposite to the stator 10 (tooth 11b) with a gap in the radial direction. The inner diameter surface 21b is the opposite surface of the outer diameter surface 21a in the radial direction. That is, the inner diameter surface 21b faces radially inward. A plurality of grooves 21c are formed on the outer diameter surface 21a. The plurality of grooves 21c are arranged at intervals in the circumferential direction. The outer diameter surface 21a is recessed inwardly in the groove 21c toward the radial direction.

[0035] The rotor core 21 has a plurality of salient poles 21d on the outer diameter surface 21a. The portion of the rotor core 21 located between two adjacent slots 21c becomes the salient pole 21d. Therefore, the plurality of salient poles 21d are arranged at intervals along the circumferential direction. Figure 1 and Figure 2In the example shown, since the number of slots 21c is 2, the number of salient poles 21d is also 2. The permanent magnet 22 is mounted on the outer diameter surface 21a. More specifically, the permanent magnet 22 is mounted on the slot 21c. Therefore, the permanent magnet 22 is located between two adjacent salient poles 21d in the circumferential direction. The salient pole 21d forms a first magnetic pole by the permanent magnet 22. The permanent magnet 22 forms a second magnetic pole. The first magnetic pole and the second magnetic pole are alternately arranged in the circumferential direction. The first magnetic pole and the second magnetic pole are, for example, an S pole and an N pole, respectively. The salient pole 21d and the permanent magnet 22 are opposite to the stator 10 (tooth 11b) in the radial direction via a gap.

[0036] The shaft 30 is formed of a magnetic body. The shaft 30 extends in the axial direction. The shaft 30 is mounted on the inner diameter surface 21b. The housing 40 is formed of a magnetic body. The housing 40 covers the stator 10 and the rotor 20. The shaft 30 is supported by a rolling bearing 60 mounted on the housing 40 so as to be rotatable around the central axis of the shaft 30.

[0037] exist Figure 3 In , the magnetic flux is represented by solid arrows. Figure 3 In the example shown, a magnetic flux is generated from the tooth 11b toward the radial inside. The magnetic flux generated at the tooth 11b interlinks with the rotor 20 through the gap between the tooth 11b and the outer diameter surface 21a, and is directed toward the shaft 30. The magnetic flux is divided into a magnetic flux toward one side in the axial direction and a magnetic flux toward the other side in the axial direction at the shaft 30. The magnetic flux divided into one side and the other side in the axial direction passes through the housing 40 and the core back 11a and returns to the tooth 11b. In addition, when the direction of the direct current flowing through the armature winding 12 is reversed, the magnetic flux will pass through the above path in the reverse direction.

[0038] (Effect of Motor 100)

[0039] Next, the effects of the motor 100 will be described.

[0040] When the tooth 11b generates magnetic flux toward the radially outer side, the magnetic flux becomes a magnetic flux in the direction of forming the S pole at the salient pole 21d. As a result, the magnetic flux of the S pole of the salient pole 21d formed by the permanent magnet 22 is enhanced, and as a result, the magnetic flux density of the rotating magnetic field in the gap between the stator 10 and the outer diameter surface 21a increases. When the magnetic flux density of the rotating magnetic field in the gap between the stator 10 and the outer diameter surface 21a increases, the torque of the motor 100 increases.

[0041] On the other hand, when the tooth 11b generates a magnetic flux toward the radial inside, the magnetic flux becomes a magnetic flux in the direction of forming the N pole at the salient pole 21d. As a result, the magnetic flux of the S pole of the salient pole 21d formed by the permanent magnet 22 is weakened, and as a result, the magnetic flux density of the rotating magnetic field in the gap between the stator 10 and the outer diameter surface 21a is reduced. When the magnetic flux density of the rotating magnetic field in the gap between the stator 10 and the outer diameter surface 21a increases, the voltage saturation during high-speed rotation can be suppressed, and thus the constant output operating range of the motor 100 is expanded. In addition, when the magnetic flux density of the rotating magnetic field in the gap between the stator 10 and the outer diameter surface 21a increases, the iron loss during high-speed rotation and the copper loss caused by the weak excitation current can be reduced.

[0042] Thus, according to the motor 100, by controlling the DC current flowing in the armature winding 12, the magnetic flux density of the rotating magnetic field can be made variable, so that the operating range can be expanded without using the excitation winding. In addition, in the motor 100, since the excitation winding is not required, the duty factor of the armature winding 12 is increased, and the winding resistance can be reduced. In addition, in the motor 100, since the winding process can be simplified, the manufacturability can also be improved.

[0043] Implementation method 2.

[0044] The motor of the second embodiment will be described. The motor of the second embodiment is assumed to be a motor 100A. Here, points different from the motor 100 will be mainly described, and duplicate descriptions will not be repeated.

[0045] (Structure of Motor 100A)

[0046] Next, the structure of the motor 100A will be described.

[0047] Figure 4 It is a cross-sectional view of the motor 100A. Figure 4 FIG. 2 shows a cross section of the motor 100A perpendicular to the axial direction. Figure 4 As shown, the motor 100A includes a stator 10, a rotor 20, a shaft 30, and a housing 40 (not shown). In this regard, the structure of the motor 100A is the same as that of the motor 100.

[0048] In the motor 100A, the stator core 11 has a plurality of teeth 11c. The teeth 11c protrude from the inner diameter surface of the core back 11a toward the circumferential inner side. They are arranged between two adjacent teeth 11b. The armature winding 12 is not wound around the teeth 11c. From another point of view, the teeth wound around the armature winding 12 and the teeth not wound around the armature winding 12 are alternately arranged in the circumferential direction. Regarding these points, the structure of the motor 100A is different from that of the motor 100.

[0049] (Effect of motor 100A)

[0050] Next, the effects of the motor 100A will be described.

[0051] In the motor 100A, a direct current flows through the armature winding 12, thereby generating a magnetic flux in the tooth 11b. The magnetic flux interlinks with the rotor 20 through the gap between the stator 10 and the outer diameter surface 21a. In addition, the magnetic flux interlinks with the tooth 11c through the gap between the stator 10 and the outer diameter surface 21a, passes through the core back 11a, and returns to the tooth 11b. Figure 4 In the example shown, the number of teeth 11b and the number of teeth 11b are each 6. Therefore, in the motor 100A, a fixed magnetic field of 12 poles (6 pole pairs) exists in the gap between the stator 10 and the outer diameter surface 21a.

[0052] In addition, in the motor 100A, the number of salient poles 21d and the number of permanent magnets 22 are 8, respectively. Therefore, in the motor 100A, the fixed magnetic field of 6 pole pairs formed by the DC magnetic flux is modulated by the 8 salient poles 21d by the rotation of the rotor 20, and a rotating magnetic field of 4 poles (2 pole pairs) is generated in the gap between the stator 10 and the outer diameter surface 21a. In the motor 100A, the rotating magnetic field in the gap between the stator 10 and the outer diameter surface 21a is synchronized with the rotating magnetic field generated by the three-phase AC current flowing through the armature winding 12, thereby generating torque.

[0053] In the motor 100A, when a magnetic flux toward the radial inside is generated in the tooth 11b by a DC current flowing through the armature winding 12, the torque generated by the DC magnetic flux can be increased in addition to the torque generated by the permanent magnet 22. In addition, in the motor 100A, when a magnetic flux toward the radial outside is generated in the tooth 11b by a DC current flowing through the armature winding 12, the voltage saturation during high-speed rotation can be alleviated by suppressing the back electromotive force.

[0054] In the motor 100A, the armature magnetic flux circulates a DC current in a plane perpendicular to the axial direction without passing through the shaft 30 or the housing 40. Therefore, in the motor 100A, the shaft 30 or the housing 40 does not need to be used as a magnetic path, and the motor 100A can be made lighter and more compact.

[0055] Implementation method 3.

[0056] The motor of the third embodiment will be described. The motor of the third embodiment is referred to as motor 100B. Here, points different from motor 100 will be mainly described, and duplicate descriptions will not be repeated.

[0057] (Structure of Motor 100B)

[0058] Next, the structure of the motor 100B will be described.

[0059] The motor 100B has a stator 10, a rotor 20, a shaft 30, and a housing 40. In this regard, the structure of the motor 100B is common to the structure of the motor 100.

[0060] Figure 5 1 is a schematic circuit diagram of the motor 100B. Figure 5 As shown, the motor 100B also has an inverter 70 and a DC bus 71. The inverter 70 is driven by the DC bus 71 and outputs a three-phase AC current to the armature winding 12 (annular connection 13) via the connecting wires 14a, 14b, and 14c. The voltage of the DC bus 71 is set to a first voltage. The voltage of the DC power supply 50 is set to a second voltage. The first voltage is set to be greater than the second voltage. With respect to these points, the structure of the motor 100B is different from the structure of the motor 100.

[0061] (Effect of motor 100B)

[0062] Next, the effects of the motor 100B will be described.

[0063] When the first voltage is lower than the second voltage, the inverter 70 is energized by the DC power supply 50 via the diode included in the inverter 70. As a result, in this case, the three-phase AC current cannot be supplied from the inverter 70 to the armature winding 12 (ring connection 13) via the connecting wires 14a, 14b, and 14c. On the other hand, in the motor 100B, since the first voltage is greater than the second voltage, the inverter 70 can be prevented from being energized by the DC power supply 50, and the three-phase AC current can be supplied from the inverter 70 to the armature winding 12 (ring connection 13) via the connecting wires 14a, 14b, and 14c.

[0064] Implementation method 4.

[0065] The motor according to the fourth embodiment will be described. The motor according to the fourth embodiment is referred to as a motor 100C. Here, points different from the motor 100 will be mainly described, and duplicate descriptions will not be repeated.

[0066] (Structure of Motor 100C)

[0067] Next, the structure of the motor 100C will be described.

[0068] The motor 100C includes a stator 10, a rotor 20, a shaft 30, and a housing 40. In this regard, the structure of the motor 100C is common to the structure of the motor 100.

[0069] Figure 6 1 is a cross-sectional view showing an example of the rotor 20 in the motor 100C. Figure 6As shown, a virtual straight line passing through one end of the salient pole 21d in the circumferential direction and the center of the rotor core 21 is set as a straight line L1, and a virtual straight line passing through the other end of the salient pole 21d in the circumferential direction and the center of the rotor core 21 is set as a straight line L2. A virtual straight line passing through one end of the permanent magnet 22 in the circumferential direction and the center of the rotor core 21 is set as a straight line L3, and a virtual straight line passing through the other end of the permanent magnet 22 in the circumferential direction and the center of the rotor core 21 is set as a straight line L4.

[0070] The angle between the straight line L1 and the straight line L2 is defined as angle θ1, and the angle between the straight line L3 and the straight line L4 is defined as angle θ2. In the motor 100C, the angle θ1 is equal to the angle θ2. Figure 7 FIG. 2 is a cross-sectional view showing another example of the rotor 20 in the motor 100C. Figure 7 As shown, in the motor 100C, the angle θ1 may be different from the angle θ2. In the motor 100C, the angle θ1 may be greater than the angle θ2, or the angle θ1 may be smaller than the angle θ2. The structure of the motor 100C is different from that of the motor 100 in these points.

[0071] (Effect of motor 100C)

[0072] Next, the effects of the motor 100C will be described.

[0073] In the motor 100C, the operating range can be adjusted by changing the ratio of the angle θ1 and the angle θ2. For example, by making the angle θ1 larger than the angle θ2, the magnetic flux generated by the permanent magnet 22 can be suppressed, and by making the angle θ1 smaller than the angle θ2, the magnetic flux generated by the permanent magnet 22 can be increased. In addition, as the magnitude relationship between the angle θ1 and the angle θ2 changes, the magnitude of the modulation wave also changes. In this way, by changing the ratio of the angle θ1 and the angle θ2, the magnitude of the magnetic flux generated by the permanent magnet 22 and the modulation wave changes, and the operating range of the motor 100C is adjusted.

[0074] Implementation method 5.

[0075] The motor of the fifth embodiment will be described. The motor of the fifth embodiment is referred to as a motor 100D. Here, points different from the motor 100 will be mainly described, and duplicate descriptions will not be repeated.

[0076] (Structure of Motor 100D)

[0077] Next, the structure of the motor 100D will be described.

[0078] The motor 100D includes a stator 10, a rotor 20, a shaft 30, and a housing 40. In this regard, the structure of the motor 100D is common to that of the motor 100.

[0079] Figure 8 is a cross-sectional view of the rotor 20 in the motor 100D. Figure 8 , the top position of the tooth 11b in the radial direction is indicated by a dotted line. The minimum value of the distance between the salient pole 21d and the stator 10 in the radial direction is set to distance DIS1. The minimum value of the distance between the permanent magnet 22 and the stator 10 in the radial direction is set to distance DIS2. In the motor 100D, the distance DIS1 and the distance DIS2 are different from each other. More specifically, in the motor 100D, the distance DIS1 may be greater than the distance DIS2, and the distance DIS1 may be less than the distance DIS2. In addition, Figure 8 An example is shown in the case where the distance DIS1 is smaller than the distance DIS2. The structure of the motor 100D is different from the structure of the motor 100 in terms of these points.

[0080] (Effect of motor 100D)

[0081] Next, the effects of the motor 100D will be described.

[0082] In the motor 100d, for example, by making the distance DIS1 smaller than the distance DIS2, the amount of the magnetic flux generated in the tooth 11b interlinked with the permanent magnet 22 can be reduced, and the eddy current loss generated in the permanent magnet 22 can be reduced. In addition, in this case, the demagnetization tolerance of the permanent magnet 22 can be improved. In addition, in this case, the defect of the permanent magnet 22 caused by the contact between the stator 10 and the permanent magnet 22 during assembly or driving can be prevented. In addition, if the second distance is the same, the magnetic flux caused by the permanent magnet 22 and the excitation magnetic flux caused by the field current are hardly reduced.

[0083] Implementation method 6.

[0084] The motor of the sixth embodiment will be described. The motor of the fifth embodiment is referred to as the motor 200. Here, points different from the motor 100A will be mainly described, and duplicate descriptions will not be repeated.

[0085] (Structure of Motor 200)

[0086] Next, the structure of the motor 200 will be described.

[0087] The motor 200 has a stator 10, a rotor 20, a shaft 30, and a housing 40. In the motor 200, the stator 10 has a stator core 11 including a core back 11a, a plurality of teeth 11b, and a plurality of teeth 11c, and an armature winding 12 wound around each of the plurality of teeth 11b. In these points, the structure of the motor 200 is common to the structure of the motor 100A.

[0088] Fig. 9 2 is a perspective view of the rotor 20 in the motor 200. Fig. 9As shown, in the motor 200, the rotor 20 has a first rotor unit 23 and a second rotor unit 24. The first rotor unit 23 and the second rotor unit 24 are arranged in the axial direction. The first rotor unit 23 is composed of a rotor core 23a. On the outer diameter surface of the rotor core 23a, a plurality of salient poles 23b are formed at intervals along the circumferential direction. The second rotor unit 24 has a rotor core 24a and a plurality of permanent magnets 24b. The plurality of permanent magnets 24b are arranged in the circumferential direction and installed on the outer peripheral surface of the rotor core 24a. Regarding these points, the structure of the motor 200 is common to the structure of the motor 100A. In addition, in this example, the rotor 20 is composed of two rotor units, but the number of rotor units possessed by the rotor 20 may also be more than three.

[0089] (Effect of Motor 200)

[0090] Next, the effects of the motor 200 will be described.

[0091] In the motor 200, the stator 10 has a stator core 11 and an armature winding 12 similarly to the motor 100A. The stator core 11 includes a core back 11a, a plurality of teeth 11b, and a plurality of teeth 11c. The armature winding 12 is wound around each of the plurality of teeth 11b, so that torque can be generated in the second rotor unit 24. In addition, in the motor 200, by controlling the DC current flowing in the armature winding 12 using the DC power supply 50, the torque generated in the first rotor unit 23 can be adjusted.

[0092] The embodiments disclosed herein are illustrative in all points and should not be considered restrictive. The basic scope of the present disclosure is indicated by the claims rather than the embodiments described above, and is intended to include all modifications within the meaning and scope equivalent to the claims.

[0093] Description of Reference Numerals

[0094] 100, 100A, 100B, 100C, 100D, 200 motor, 10 stator, 11 stator core, 11a core back, 11b, 11ba, 11bb, 11bc, 11c teeth, 12 armature winding, 12a, 12b, 12c winding part, 13 annular knot, 14a, 14b, 14c connecting wire, 20 rotor, 21 rotor core, 21a outer diameter surface, 21b inner diameter surface, 21c slot, 21d salient pole, 22 permanent magnet, 23 first rotor unit, 23a rotor core, 23b salient pole, 24 second rotor unit, 24a rotor core, 24b permanent magnet, 30 shaft, 40 housing, 50 DC power supply, 60 rolling bearing, 70 inverter, 71 DC bus, DIS1, DIS2 distances, L1, L2, L3, L4 straight lines.

Claims

1. A motor, wherein: have: stator; and Rotor, The stator includes a plurality of first teeth arranged at intervals in a circumferential direction, and an armature winding wound around each of the plurality of first teeth. The armature winding is a ring-shaped winding. A DC power source is connected to one end and the other end of the looped wire. In each of the plurality of first teeth, a magnetic pole of the same polarity is formed by a direct current flowing through the armature winding, The rotor has a rotor core and a plurality of permanent magnets. The rotor core has an outer diameter surface facing outward in the radial direction and an inner diameter surface which is an opposite surface of the outer diameter surface in the radial direction. The rotor core has a plurality of salient poles forming a first magnetic pole on the outer diameter surface. The plurality of salient poles are arranged at intervals along the circumferential direction, The plurality of permanent magnets are mounted on the outer diameter surface so as to be located between two adjacent salient poles among the plurality of salient poles in the circumferential direction, and form a second magnetic pole. The plurality of salient poles and the plurality of permanent magnets are opposed to the stator with a gap therebetween in the radial direction.

2. The motor according to claim 1, wherein: The armature winding has the same winding direction at each of the plurality of first teeth.

3. The motor according to claim 1, wherein: Also available: Axles; and case, The shaft and the housing are formed of a magnetic body. The shaft is mounted on the inner diameter surface. The housing covers the stator and the rotor, A magnetic flux generated in each of the plurality of first teeth by a direct current flowing through the armature winding passes through the gap, each of the plurality of salient poles, the shaft, and the housing, and returns to each of the plurality of first teeth.

4. The motor according to claim 1, wherein: The stator further includes a plurality of second teeth arranged at intervals in the circumferential direction. Each of the plurality of second teeth is disposed between two adjacent first teeth of the plurality of first teeth.

5. The electric machine according to any one of claims 1 to 4, wherein: A minimum value of a distance between each of the plurality of permanent magnets and the stator is different from a minimum value of a distance between each of the plurality of salient poles and the stator.

6. The electric machine according to any one of claims 1 to 4, wherein: Each of the plurality of permanent magnets has a first end and a second end in the circumferential direction, Each of the plurality of salient poles has a third end and a fourth end in the circumferential direction, The first angle is different from the second angle, wherein the first angle is the angle formed by a first virtual straight line passing through the first end and the center of the rotor core and a second virtual straight line passing through the second end and the center, and the second angle is the angle formed by a third virtual straight line passing through the third end and the center and a fourth virtual straight line passing through the fourth end and the center.

7. The electric machine according to any one of claims 1 to 4, wherein: further comprising a power converter electrically connected to the armature winding, The power converter is driven by a DC bus, The voltage of the DC bus is greater than the voltage of the DC power supply.

8. A motor, wherein: have: stator; and The rotor is arranged with a gap between the stator and the rotor in the radial direction. The stator includes a plurality of teeth arranged at intervals in a circumferential direction, and an armature winding wound around each of the plurality of teeth. The armature winding is a ring-shaped winding. A DC power source is connected to one end and the other end of the looped wire. In each of the plurality of teeth, a magnetic pole of the same polarity is formed by a direct current flowing through the armature winding, The rotor comprises a first rotor unit and a second rotor unit. The first rotor unit and the second rotor unit are arranged along the axial direction, The field poles of the first rotor unit are composed only of salient poles, The field poles of the second rotor unit consist only of permanent magnets.

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