Winding excitation rotor

Abstract

In a winding excitation-type rotating electrical machine, a winding excitation rotor (60) has: a rotor core (61) having main pole sections (62) which are provided to each of magnetic poles arranged in the circumferential direction and which protrude in the radial direction; and a field winding (70) wound around the main pole section. The field winding has coil bodies (90) formed by winding a wire material in multiple layers in the radial direction for each of the main pole sections, and the coil bodies are connected in series in the circumferential direction. Each coil body has an inner end section (93), which is one end of the wire material, at a position inside the coil body in the radial direction, and an outer end section (94), which is the other end of the wire material, at a position outside the coil body in the radial direction. In the coil bodies, the inner end portion is connected to the inner end portion of another coil body adjacent to one side in the circumferential direction, and the outer end portion is connected to the outer end portion of another coil body adjacent to the other side in the circumferential direction.

Description

[0001] Cross-reference to related applications

[0002] This application is based on Japanese application No. 2022-165072 filed on October 13, 2022, and the contents thereof are incorporated herein by reference. Technical Field

[0003] The disclosure in this specification relates to a winding-field rotor. Background Art

[0004] In a winding excitation type rotating electric machine, an excitation winding is wound around each main pole portion of the rotor core, and an excitation magnetic field is generated by energizing the excitation winding. In this case, the excitation winding is wound in opposite directions to alternately arrange the N poles and the S poles in each circumferentially adjacent magnetic pole.

[0005] In addition, as a technology for winding the excitation winding on each main pole portion, the following structure is known: after the winding number required for each main pole portion is performed on each magnetic pole, that is, after the winding is completed for each magnetic pole, the winding is made continuous with the adjacent magnetic poles adjacent in the circumferential direction. For example, Patent Document 1 discloses the following structure: for each magnetic pole, multiple layers of winding are completed in the radial direction on each main pole portion, and between each circumferentially adjacent magnetic pole, the radially innermost position in one magnetic pole and the radially outermost position in the other magnetic pole are connected, so that the excitation winding is continuous with each circumferentially adjacent magnetic pole.

[0006] Prior art literature

[0007] Patent Literature

[0008] Patent Document 1: Japanese Patent Application Publication No. 2012-222941

[0009] However, as described above, in a structure that continuously winds along the circumferential direction while completing the winding for each magnetic pole, when connecting the windings between the magnetic poles adjacent in the circumferential direction, a large twist is applied to the conductor material in order to connect the radial innermost side and the radial outermost side. In this case, there is a concern that a large load is applied to the conductor material and the insulation coating of the conductor material is damaged. In addition, in order to avoid excessive twisting of the conductor material, it is considered to use separate relay wires to connect the excitation windings of each magnetic pole, but in this case, there is a concern that the structure will be complicated and the number of operating steps will increase. Summary of the invention

[0010] The present disclosure has been made in view of the above-mentioned problems, and an object of the present disclosure is to provide a winding field rotor in which a field winding can be simply and appropriately wound.

[0011] The winding excitation rotor of the present disclosure,

[0012] The invention is applied to a winding excitation type rotating electric machine, wherein the winding excitation rotor comprises: a rotor core having a main pole portion provided at each magnetic pole arranged in the circumferential direction and protruding in the radial direction; and an excitation winding wound around the main pole portion.

[0013] The field winding has a coil body formed by winding a conductive wire material in multiple layers in the radial direction for each main pole portion, and the coil bodies are connected in series in the circumferential direction.

[0014] Each of the coil bodies has an inner end portion as one end of the conductive wire material at a position radially inside the coil body, and an outer end portion as the other end of the conductive wire material at a position radially outside the coil body.

[0015] In the coil body, the inner end portion is connected to the inner end portion of another coil body adjacent to one side in the circumferential direction, and the outer end portion is connected to the outer end portion of another coil body adjacent to the other side in the circumferential direction.

[0016] According to the above structure, in the field winding of the winding excitation rotor, the coil bodies arranged in each main pole portion adjacent in the circumferential direction are connected to each other through the inner end portion on the radial inner side (i.e., the inner layer side), and are connected to each other through the outer end portion on the radial outer side (i.e., the outer layer side), thereby being connected in series in the circumferential direction. In this case, the coil bodies are connected in series in the circumferential direction by connecting the inner end portions to each other and the outer end portions to each other, so that excessive radial twisting of the conductor material does not occur. Therefore, it is possible to suppress a large load on the conductor material or damage to the insulating coating of the conductor material. As a result, the field winding can be simply and appropriately wound. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and other objects, features and advantages of the present disclosure will become more apparent from the following detailed description with reference to the attached drawings. These drawings are as follows:

[0018] Figure 1 It is the overall structure diagram of the control system of the rotating motor.

[0019] Figure 2 A diagram showing an inverter and its peripheral structure.

[0020] Figure 3 is a cross-sectional view of the rotor.

[0021] Figure 4 This is a diagram showing a circuit included in the rotor.

[0022] Figure 5 It is a perspective view showing the structure of a coil body.

[0023] Figure 6It is a diagram schematically showing the connection of each coil body.

[0024] Figure 7 It is a diagram schematically showing the connection of each coil body.

[0025] Figure 8 This is a schematic diagram showing a state where a coil body is wound and mounted on each main pole portion of a rotor core.

[0026] Fig. 9 It is a perspective view showing a structural example of a coil body.

[0027] Fig.10 It is a plan view showing a state where a plurality of coil bodies are arranged in a circumferential direction and a radial direction.

[0028] Fig.11 It is a diagram showing the connection state of each winding part, a diode, and a capacitor.

[0029] Fig.12 This is a schematic diagram showing a state in which a coil body is wound around each main pole portion of a rotor core in another example. DETAILED DESCRIPTION

[0030] Hereinafter, one embodiment of a rotary electric machine according to the present invention will be described with reference to the drawings. A control system including a rotary electric machine is mounted on a vehicle. The rotary electric machine is a driving power source of the vehicle.

[0031] like Figure 1 As shown, the control system includes a DC power supply 10, an inverter 20, a control device 30, and a rotating electric machine 40. The rotating electric machine 40 is a synchronous machine of a winding excitation type. For example, the rotating electric machine 40, the inverter 20, and the control device 30 are provided to form a mechatronic drive device, or the rotating electric machine 40, the inverter 20, and the control device 30 are respectively composed of individual components.

[0032] The rotating electrical machine 40 includes a housing 41, and a stator 50 and a rotor 60 housed in the housing 41. The rotating electrical machine 40 of the present embodiment is an inner rotor type rotating electrical machine in which the rotor 60 is arranged radially inside the stator 50. The rotor 60 corresponds to a "winding field rotor".

[0033] The stator 50 includes a stator core 51 and a stator winding 52. The stator core 51 is made of laminated steel plates made of a soft magnetic body, and includes an annular back yoke and a plurality of teeth protruding radially inward from the back yoke. The stator winding 52 is made of, for example, copper wire, and includes U, V, and W phase windings 52U, 52V, and 52W arranged in a state where the electrical angle is staggered by 120° from each other.

[0034] The rotor 60 includes a rotor core 61 and an excitation winding 70. The rotor core 61 is made of a soft magnetic material, such as a laminated steel plate. The excitation winding 70 is made of, for example, aluminum wire. Aluminum wire has a small specific gravity and can reduce the centrifugal force when the rotor 60 rotates. In addition, the excitation winding 70 is not limited to aluminum wire, and can also be, for example, copper wire or CNT (carbon nanotube).

[0035] The rotating shaft 32 is inserted through the center hole of the rotor core 61. The rotating shaft 32 is rotatably supported by the bearing 42 in the housing 41. The stator 50 and the rotor 60 are both arranged coaxially with the rotating shaft 32. In the following description, the direction in which the rotating shaft 32 extends is referred to as the axial direction, the direction radially extending from the center of the rotating shaft 32 is referred to as the radial direction, and the direction extending in a circumferential shape with the rotating shaft 32 as the center is referred to as the circumferential direction.

[0036] like Figure 2 As shown, the inverter 20 has a series connection body of U, V, W phase upper arm switches SUP, SVp, SWp and U, V, W phase lower arm switches SUn, SVn, SWn. The first ends of the U, V, W phase windings 52U, 52V, 52W are connected to the connection points of the U, V, W phase upper arm switches SUP, SVp, SWp and the U, V, W phase lower arm switches SUn, SVn, SWn. The second ends of the U, V, W phase windings 52U, 52V, 52W are connected to the neutral point. That is, in the present embodiment, the U, V, W phase windings 52U, 52V, 52W are star-connected. In addition, in the present embodiment, each switch SUP~SWn is an IGBT. A freewheeling diode is connected in anti-parallel to each switch SUP~SWn.

[0037] The collectors of the U, V, W phase upper arm switches Sup, SVp, SWp are connected to the positive terminal of the DC power supply 10. The emitters of the U, V, W phase lower arm switches SUn, SVn, SWn are connected to the negative terminal of the DC power supply 10. In addition, a smoothing capacitor 11 is connected in parallel to the DC power supply 10.

[0038] Next, use Figure 3 The rotor 60 will be described.

[0039] The rotor core 61 has a cylindrical portion 61a and a plurality of main pole portions 62 protruding radially outward from the cylindrical portion 61a. The cylindrical portion 61a is equivalent to a yoke portion. In the present embodiment, eight main pole portions 62 are arranged at equal intervals in the circumferential direction. A winding holder 63 is provided at the radial top end portion of the main pole portion 62, which extends in a flange shape in the circumferential direction and holds the excitation winding 70 from the radial outside.

[0040] The excitation winding 70 has a first winding portion 71a and a second winding portion 71b arranged in the radial direction. In each main pole portion 62, the first winding portion 71a is wound on the radially outer side, and the second winding portion 71b is wound on the radially inner side of the first winding portion 71a. In each main pole portion 62, the direction (current direction) in which the current flows through the first winding portion 71a and the second winding portion 71b is the same as each other. In addition, the current direction of each winding portion 71a, 71b wound on one of the main pole portions 62 adjacent in the circumferential direction is opposite to the current direction of each winding portion 71a, 71b wound on the other main pole portion 62. Therefore, the magnetization directions of the main pole portions 62 adjacent in the circumferential direction are opposite to each other. In the rotor 60, a plurality of magnetic poles (excitation poles) arranged in the circumferential direction are formed by each main pole portion 62 in the rotor core 61 and the excitation winding 70 wound on each main pole portion 62. In the present embodiment, the number of magnetic poles of the rotor 60 is set to 8, but the number of poles can be changed.

[0041] Figure 4 The diagram shows a circuit on the rotor 60 side having winding portions 71a and 71b. The first winding portion 71a and the second winding portion 71b are connected in series, and a diode 81 serving as a rectifying element is connected between both ends of the series connection body formed by these winding portions 71a and 71b. That is, the cathode of the diode 81 is connected to the first end of the first winding portion 71a, and the second end of the first winding portion 71a is connected to the first end of the second winding portion 71b. The anode of the diode 81 is connected to the second end of the second winding portion 71b. A capacitor 82 is connected in parallel to the second winding portion 71b. Figure 4 , L1 represents the inductance of the first winding portion 71 a , L2 represents the inductance of the second winding portion 71 b , and C represents the electrostatic capacity of the capacitor 82 .

[0042] In this embodiment, a series resonant circuit is formed by the first winding portion 71a, the capacitor 82 and the diode 81, and a parallel resonant circuit is formed by the second winding portion 71b and the capacitor 82. The first resonant frequency, which is the resonant frequency of the series resonant circuit, is set to f1, and the second resonant frequency, which is the resonant frequency of the parallel resonant circuit, is set to f2. The resonant frequencies f1 and f2 are expressed by the following equations (eq1) and (eq2).

[0043] [Mathematical formula 1]

[0044]

[0045] [Mathematical formula 2]

[0046]

[0047] Back to Figure 2As described above, the control device 30 generates a drive signal for turning on and off each switch SUP to SWn constituting the inverter 20. Specifically, the control device 30 generates a drive signal for turning on and off each arm switch SUP to SWn in order to convert the DC power output from the DC power supply 10 into AC power and supply it to the U, V, W phase windings 52U, 52V, 52W, and supplies the generated drive signal to the gate of each arm switch SUP to SWn.

[0048] The control device 30 turns on and off each switch SUP to SWn in such a manner that a composite current of a fundamental current and a harmonic current flows through each phase winding 52U, 52V, 52W. The fundamental current is a current that mainly generates torque in the rotating electrical machine 40. The harmonic current is a current that mainly excites the field winding 70 and causes the field current to flow through the field winding 70. That is, the control device 30 controls the energization of the stator winding 52 by superimposing a current signal of a harmonic current on the fundamental current. The electrical angles of the phase currents flowing through each phase winding 52U, 52V, 52W are each staggered by 120°.

[0049] In the present embodiment, as described above, the field winding 70 is wound around the main pole portion 62 with the first winding portion 71a being the radially outer side and the second winding portion 71b being the radially inner side. Thus, the harmonic magnetic flux generated by the harmonic current in the stator winding 52 is easily received by the first winding portion 71a as the field coil, and the field current is efficiently generated in the rotor 60.

[0050] In addition, part or all of the functions of the control device 30 may be configured in hardware, such as one or more integrated circuits, etc. In addition, the functions of the control device 30 may be configured by software recorded on a non-transitory physical recording medium and a computer that executes the software.

[0051] Next, the specific structure of the field winding 70 will be described.

[0052] like Figure 3 As shown, the field winding 70 uses a rectangular wire with a substantially rectangular cross-section (specifically, a substantially rectangular shape) as a conductor material, and the rectangular wire is wound multiple times in a manner arranged in radial and circumferential directions. The rectangular wire is composed of a conductor portion and an insulating layer covering the conductor portion. Figure 3 In the example shown, the first winding portion 71a constituting the excitation winding 70 is arranged in two layers in the radial direction, and the second winding portion 71b is arranged in two layers in the radial direction. However, the number of layers in the radial direction of each winding portion 71a, 71b may be other than two layers, and the number of layers of each winding portion 71a, 71b may be different.

[0053] In addition, the number of windings of each layer arranged in the radial direction (in other words, the number of arrangement of the rectangular lines in the circumferential direction) is different between the radial inner side and the radial outer side. Specifically, when the first layer, the second layer, the third layer, and the fourth layer are arranged in order from the radial outer side, the number of windings of the first layer is 5, the number of windings of the second layer is 4, the number of windings of the third layer is 3, and the number of windings of the fourth layer is 2. For the first winding portion 71a and the second winding portion 71b, in the first winding portion 71a, the number of windings of the two radial layers is 5 and 4, respectively, and in the second winding portion 71b, the number of windings of the two radial layers is 3 and 2, respectively.

[0054] As described above, by making the number of windings of each layer arranged in the radial direction different, the occupancy rate can be improved. In addition, the number of windings of each winding portion 71a, 71b can also be different. If the occupancy rate is not important, the number of windings of each layer arranged in the radial direction can also be the same.

[0055] In the present embodiment, the field winding 70 has a plurality of coil bodies 90 formed by winding rectangular wires in multiple layers in the radial direction for each magnetic pole (each main pole portion 62 ), and the coil bodies 90 for each magnetic pole are connected in series in the circumferential direction.

[0056] Figure 5 (a) is a perspective view showing the basic structure of a coil body 90 using rectangular wires. Figure 5 In (a), direction A is radial, direction B is axial, and direction C is circumferential. Figure 5 In the structure of (a), the number of windings of each layer inside and outside the radial direction is the same, but the number of windings of each layer inside and outside the radial direction can also be different.

[0057] The coil body 90 is an air-core coil constructed as an α-winding coil, and the two layers of windings arranged in the radial direction are formed integrally. That is, the coil body 90 has an inner coil portion 91 and an outer coil portion 92, which are respectively radially inward (inner layer side) and radially outward (outer layer side) when installed to the main pole portion 62, and in each of these coil portions 91 and 92, the rectangular wires are connected to each other on the inner circumference of the coil. The coil body 90 can also be said to be a unit coil that takes the two radial layers as one unit. In addition, the inner coil portion 91 has a coil end 93 extending axially from the surrounding portion, and the outer coil portion 92 has a coil end 94 extending axially from the surrounding portion. The coil end 93 is equivalent to the "inner end", and the coil end 94 is equivalent to the "outer end". The coil body 90 is installed on the main pole portion 62 by inserting the main pole portion 62 through the hollow portion.

[0058] In the field winding 70, the coil bodies 90 of the magnetic poles adjacent in the circumferential direction are connected in series by joining the coil ends 93 and 94 of the coil bodies 90 to each other. Figure 5 (b) and (c) illustrate its structure. Figure 5 (b) shows two kinds of coil bodies 90 with different forms of coil ends 93 and 94. In addition, in the following description, one of the two coil bodies 90 is also recorded as "first coil body 90A", and the other is recorded as "second coil body 90B". In addition, the coil ends 93 and 94 in the first coil body 90A are set as "coil ends 93a and 94a", and the coil ends 93 and 94 in the second coil body 90B are set as "coil ends 93b and 94b".

[0059] like Figure 5 As shown in (b), in the first coil body 90A, the shape of the coil end 94a of the outer coil part 92 among the coil ends 93a and 94a of the inner coil part 91 and the outer coil part 92 is the same as Figure 5 Specifically, the coil end 94a of the outer coil portion 92 is not Figure 5 The end position shown in (a) does not extend directly in the axial direction, but extends circumferentially along the upper surface of the surrounding part of the first coil body 90A, and bends axially at a position that is circumferentially offset by a pole spacing, that is, a position that is roughly horizontally arranged with the coil end 93a of the inner coil portion 91.

[0060] In the second coil body 90B, the coil end portions 93b and 94b of the inner coil portion 91 and the outer coil portion 92 are configured so that the coil end portion 93b of the inner coil portion 91 is similar to the coil end portion 94b of the outer coil portion 92. Figure 5 Specifically, the coil end 93b of the inner coil portion 91 is not formed from Figure 5 The end position shown in (a) does not extend directly in the axial direction, but extends circumferentially to the side opposite to the surrounding portion of the second coil body 90B, and bends in the axial direction at a position offset by one magnetic pole pitch in the circumferential direction.

[0061] In summary, the first coil body 90A and the second coil body 90B are formed into a coil body 90 ( Figure 5 Based on the coil body 90 shown in (a) of FIG. 1 , two types of coil bodies 90 are formed in which the coil end portions 93 and 94 have different shapes.

[0062] Figure 5 (c) is a diagram showing a state where coil bodies 90A and 90B arranged in the circumferential direction are connected in series. Figure 5In (c), for convenience, the coil bodies 90A and 90B are arranged in a straight line rather than an arc. In this case, the coil ends 93a and 93b of the coil bodies 90A and 90B are joined to each other on the radial inner side of the radial inner and outer sides, and the coil ends 94a and 94b of the coil bodies 90A and 90B are joined to each other on the radial outer side. The coil ends 93 and 94 can be joined by welding.

[0063] In addition, as an actual structure, when each coil body 90A, 90B is arranged in an arc shape, each coil body 90A, 90B is not arranged in a straight line when viewed from above, but is arranged in a state of crossing each other. Therefore, at least any one of the mutually engaged coil ends 93a, 93b can rise axially on a line that crosses obliquely relative to the extension direction. Thus, the coil ends 93 can be appropriately surface-joined with each other. For example, the direction of the surface joining of the coil ends 93 with each other can be the direction along the straight line extending from the rotation center point of the rotor 60. The same is true for the coil ends 94a, 94b.

[0064] Figure 6 This is a schematic representation of the above Figure 5 The figure (c) shows the connection of each coil body 90A, 90B, and the same figure shows the connection state of each coil body 90A, 90B arranged in the circumferential direction. Figure 6 In the diagram, the left-right direction is the circumferential direction, and the up-down direction is the axial direction.

[0065] exist Figure 6 In the embodiment, the first coil body 90A and the second coil body 90B are alternately arranged in the circumferential direction, and the radial inner and outer coil ends 93 and 94 of each coil body 90A and 90B are respectively connected at intervals of two magnetic pole pitches. In this case, the connection position of each coil end 93 and 94 is between each magnetic pole, near the boundary portion (q axis) of the magnetic poles adjacent to each other in the circumferential direction. In the first coil body 90A and the second coil body 90B, the current directions of the rectangular lines are opposite to each other.

[0066] The configuration of each coil body 90A, 90B may also be changed. Figure 7 (a) Figure 7 (b) The structure of Figure 7 In the structures of (a) and (b), relative to Figure 6 The coil ends 93 and 94 of the coil bodies 90A and 90B have different structures.

[0067] exist Figure 7 In (a), the first coil body 90A is Figure 5The structure is the same as the coil body 90 (basic structure of the α-winding coil) of (a). In contrast, in the second coil body 90B, each coil end 93b, 94b of the inner coil portion 91 and the outer coil portion 92 extends circumferentially to the side opposite to the encircling portion of the second coil body 90B, and is bent axially at a position offset by a magnetic pole pitch in the circumferential direction. In addition, the radially inner coil ends 93 of each coil body 90A, 90B are joined to each other, and the radially outer coil ends 94 are joined to each other. In this case, the connection position of each coil end 93, 94 is an interval of a magnetic pole pitch, near the boundary portion (q axis) of the circumferentially adjacent magnetic poles.

[0068] In addition, Figure 7 In (b), in the first coil body 90A and the second coil body 90B, the coil ends 93 and 94 of the inner coil portion 91 and the outer coil portion 92 extend circumferentially as shown in the figure. In addition, the radially inner coil ends 93 of each coil body 90A and 90B are mutually joined, and the radially outer coil ends 94 are mutually joined. In this case, the connection position of each coil end 93 and 94 is an interval of a magnetic pole pitch, near the center portion (d axis) of each magnetic pole.

[0069] In the above Figure 6 , Figure 7 In the structures of (a) and (b), in the first coil body 90A, the coil end 93 as one end of the rectangular wire (conducting wire material) is connected to the coil end 93 of the second coil body 90B adjacent to one side in the circumferential direction, and the coil end 94 as the other end of the rectangular wire is connected to the coil end 94 of the second coil body 90B adjacent to the other side in the circumferential direction. The second coil body 90B also has the same structure. In this case, at least any one of the coil ends 93 and 94 of each coil body 90 arranged in the circumferential direction has an extension portion extending in the circumferential direction toward one side of the coil body 90 serving as the connection object.

[0070] In addition, as described above, the field winding 70 includes a first winding portion 71a and a second winding portion 71b, and each of these winding portions 71a and 71b is wound and installed on each main pole portion 62 with the first winding portion 71a as the radial outer side and the second winding portion 71b as the radial inner side. In this case, the first winding portion 71a is formed by connecting the coil bodies 90 installed in each main pole portion 62 in series in the circumferential direction. In addition, similarly, the second winding portion 71b is formed by connecting the coil bodies 90 installed in each main pole portion 62 in series in the circumferential direction.

[0071] Figure 8 2 is a schematic diagram showing a state in which the coil bodies 90 in which the winding portions 71a and 71b are wound and mounted on the main pole portions 62 of the rotor core 61. Figure 8In the figure, the two layers (two layers of conductors) on the radially outer side are the first winding portion 71a, and the four layers (four layers of conductors) on the radially inner side are the second winding portion 71b. If the coil of the eight coil bodies 90 that goes around the rotor once is set as an annular coil, the first winding portion 71a is composed of one annular coil, and the second winding portion 71b is composed of two annular coils. These annular coils are equivalent to a series coil portion formed by connecting the coil bodies 90 that go around the rotor once in series. Here, the coil bodies 90 that constitute the first winding portion 71a are C11, C12, C13, ... C18 in the clockwise direction. In addition, the coil bodies 90 that constitute the first week of annular coils in the second winding portion 71b are set to C21, C22, C23, ... C28 in sequence, and the coil bodies 90 that constitute the second week of annular coils are set to C31, C32, C33, ... C38 in sequence.

[0072] In the first winding portion 71a, one end of the first coil body C11 (the starting point of the first winding portion 71a) is connected to the cathode of the diode 81, and the other end is connected to the second coil body C12 adjacent in the circumferential direction. The second and subsequent coil bodies C12 to C18 are connected in series with the coil bodies adjacent in the circumferential direction. In addition, the eighth coil body C18 (the end coil of the first winding portion 71a) is connected to the capacitor 82 and the coil body C21 which is the starting coil of the second winding portion 71b.

[0073] In the second winding portion 71b, coil bodies C21 to C28 are connected in series in the circumferential direction on the radially inner side of the first winding portion 71a (coil bodies C11 to C18), and coil bodies C31 to C38 are connected in series in the circumferential direction on the radially inner side of the coil bodies C21 to C28. In addition, coil body C38, which is the end coil of the second winding portion 71b, is connected to the anode of the capacitor 82 and the diode 81.

[0074] Next, a configuration related to connection between the respective winding portions 71 a and 71 b of the field winding 70 , and the diode 81 and capacitor 82 constituting the resonance circuit will be described.

[0075] Fig. 9 (a) and (b) are perspective views showing a structural example of the coil body 90. Fig.10 90 is a top view showing a state where a plurality of coil bodies 90 are arranged in the circumferential direction and the radial direction. The coil connection structure described here is equivalent to Figure 7 The structure shown in (b). Fig.10 In the embodiment, the first winding portion 71a is composed of one row of annular coils on the outermost side in the radial direction, and the second winding portion 71b is composed of three rows of annular coils in the radial direction on the radial inner side of the first winding portion 71a.

[0076] like Fig. 9As shown in (a), the first coil body 90A has coil ends 93a, 94a on the radially inner side and the outer side, respectively, and the second coil body 90B has coil ends 93b, 94b on the radially inner side and the outer side, respectively. These coil ends 93, 94 extend circumferentially as shown in the figure, and the radially inner coil ends 93 of each coil body 90A, 90B and the radially outer coil ends 94 are mutually engaged, thereby being connected in series along the circumferential direction.

[0077] exist Fig. 9 In (b), X1 to X7 are joints between coil ends, and each of these joints X1 to X7 is arranged circumferentially at a magnetic pole pitch, and the joints at the radial inside and the radial outside are alternated. The positions of each joint X1 to X7 are near the d-axis of each magnetic pole. X0 is a terminal portion connected to the coil body 90 of other columns or the diode 81 and capacitor 82 that constitute the resonant circuit. In addition, one of the coil ends 93 on the radial inside of the coil body 90 (the coil end 93 that becomes the terminal after one circle around the rotor) is a transition portion 95 that extends toward the adjacent magnetic pole in the circumferential direction and is connected to the coil body 90 of other radial inside columns, and the top end of the transition portion 95 becomes a terminal portion connected to the other coil bodies 90. The transition portion 95 extends in a radially biased state, and is a radial switching line that switches the radial columns of the coil body 90.

[0078] like Fig.10 As shown, the first winding portion 71a and the second winding portion 71b are connected by a transition portion 95 of a coil body 90 of the first winding portion 71a. In addition, in the second winding portion 71b, the annular coils in the outer first column and the annular coils in the outer second column of the three radially arranged annular coils are connected by a transition portion 95 extending from the annular coils in the outer first column, and the annular coils in the outer second column and the annular coils in the outer third column are connected by a transition portion 95 extending from the annular coils in the outer second column.

[0079] exist Fig.10In the embodiment, as a structure for connecting the first winding portion 71a and the second winding portion 71b, a transition portion 95 is provided at the coil end 93 on the radial inner side of the first winding portion 71a, but this may be changed so that in the second winding portion 71b, a transition portion 95 is provided at the coil end 93 on the radial inner side of the annular coil that is the first row on the outer side among the three rows of annular coils in the radial direction (the annular coil that is closest to the first winding portion 71a). In this case, the transition portion 95 may be formed by offsetting the top end of the coil end 93 of the coil body 90 in the second winding portion 71b radially outward. Alternatively, the transition portion 95 may be provided at both the coil end 93 on the radial inner side of the first winding portion 71a and the coil end 93 on the radial inner side of the annular coil that is the first row on the outer side among the three rows of annular coils in the radial direction in the second winding portion 71b. Alternatively, a transition portion 95 may be provided at least at one of the radially outer coil end 94 of the first winding portion 71a and the radially outer coil end 94 of the outer first row of the radially three rows of annular coils in the second winding portion 71b.

[0080] In addition, the coil body 90 of the first winding part 71a and the coil body 90 of the second winding part 71b are separated from each other, and an annular gap can be formed between these two winding parts 71a and 71b. Alternatively, a plate-shaped partition member extending in the circumferential direction can be provided between each winding part 71a and 71b. The partition member can be a magnetic body, and more specifically, can be a laminated steel plate laminated in the radial direction.

[0081] Fig.11 The diagram shows the connection state between each winding portion 71 a and 71 b and the diode 81 and the capacitor 82 .

[0082] exist Fig.11 In (a), the cylindrical portion 61a of the rotor core 61 is represented by an imaginary line, and a diode 81 and a capacitor 82 are fixed to the axial end surface of the cylindrical portion 61a. That is, the axial end surface of the cylindrical portion 61a becomes a setting surface 65 for arranging the diode 81 and the capacitor 82. These diodes 81 and capacitors 82 are arranged on concentric circles concentric with the rotation center of the rotor 60. The capacitor 82 can be configured as a capacitor assembly in which a plurality of capacitor elements are connected in the circumferential direction. In addition, Fig.11 The points P1, P2, and P3 in (a) are Fig.11 In the resonant circuit shown in (b), they correspond to P1 to P3 respectively.

[0083] exist Fig.11In (a), the cathode of the diode 81 is connected to point P1, and one end of the capacitor 82 (capacitor assembly) is connected to point P2, which is the midpoint of each winding portion 71a, 71b. In addition, the other end of the capacitor 82 (capacitor assembly) and the anode of the diode 81 are connected to point P3. In this case, the connection end portions of each winding portion 71a, 71b corresponding to points P1 to P3 protrude in the axial direction to the same side as the installation surface 65, and are connected to the diode 81 and the capacitor 82 through the protruding portion.

[0084] According to the present embodiment described in detail above, the following excellent effects can be obtained.

[0085] In the field winding 70 of the rotor 60, the coil bodies 90 provided in each main pole portion 62 adjacent in the circumferential direction are connected to each other through the coil ends 93 on the radial inner side, and are connected to each other through the coil ends 94 on the radial outer side, thereby being connected in series in the circumferential direction. In this case, by connecting the coil ends 93 to each other and the coil ends 94 to each other, the coil bodies 90 are connected in series in the circumferential direction, so that excessive radial twisting of the rectangular wire is not generated. Therefore, it is possible to suppress the generation of a large load on the rectangular wire or damage to the insulating coating of the rectangular wire. As a result, the field winding 70 can be simply and appropriately wound.

[0086] Each coil body 90 arranged in the circumferential direction is a structure in which at least one of the coil ends 93, 94 has an extension portion extending circumferentially toward one side of the coil body 90 to be connected. In this case, by adding a simple structure in which the coil ends 93, 94 are extended circumferentially in each coil body 90, each coil body 90 can be appropriately connected to each other.

[0087] In this embodiment, each coil body 90 is set as an α-winding coil using a rectangular wire, so the coil occupancy rate in the rotor 60 can be increased, and the connection between the coil bodies 90 can be simply implemented. In this case, by pulling out the coil ends 93 and 94 in the axial direction in each coil body 90, the space between the coil bodies 90 adjacent to each other in the circumferential direction is not used as a wire pulling space, thereby increasing the occupancy rate. As a result, the production efficiency of the coil body 90 and the connection between the coil bodies 90 can be improved, and the productivity can be improved.

[0088] For example, in Figure 7 In the structures of (a) and (b), in each coil body 90 adjacent in the circumferential direction, the joints of the radially inner coil end 93 and the radially outer coil end 94 are alternately arranged in the circumferential direction and are arranged at intervals corresponding to a magnetic pole pitch. In this case, by separating the radially inner and outer joints from each other, when these joints are joined by welding or the like, the operation can be easily and appropriately performed.

[0089] The field winding 70 is configured to have a series winding section structure formed by connecting a plurality of coil bodies 90 in series around the rotor (i.e., a structure having winding sections 71a and 71b each being an annular coil), and the series winding sections arranged in the radial direction are connected in series. Furthermore, the top end portion of at least one of the coil end 93 on the inner layer side of the coil body 90 in the radially outer series winding section (first winding section 71a) and the coil end 93 on the inner layer side of the coil body 90 in the radially inner series winding section (second winding section 71b) is offset in the radial direction, and the series winding sections are connected to each other at the offset portion. Alternatively, instead of connecting the coil end 93 on the inner layer side of each series winding section arranged in the radial direction as described above, a structure is used in which the coil end 94 on the outer layer side is connected to each other. In this case, in each series winding portion (first winding portion 71a, second winding portion 71b), by radially shifting the coil ends 93, 94 of the coil body 90 by the minimum necessary limit, the series winding portions arranged in the radial direction can be appropriately connected to each other.

[0090] In a structure in which a first winding portion 71a and a second winding portion 71b are provided as an excitation winding 70, and a diode 81 and a capacitor 82 are connected to the excitation winding 70 as a resonant circuit, the first winding portion 71a and the second winding portion 71b are respectively a series winding portion formed by connecting in series the coil bodies 90 that wind at least one turn around the rotor, and these winding portions 71a and 71b are connected in series. In addition, in this structure, the first winding portion 71a is arranged on the radially outer side (stator 50 side), and the second winding portion 71b is arranged on the radially inner side (opposite side to the stator). As a result, the first winding portion 71a can easily absorb the high-order harmonic magnetic flux from the stator 50, and the excitation current can be efficiently generated in the rotor 60.

[0091] In addition, in the annular coils in the first outer row of the three radially arranged annular coils of the first winding portion 71a and the second winding portion 71b, at least one of the coil ends 93 and 94 on the inner layer side and the outer layer side is offset in the radial direction, and the winding portions 71a and 71b are connected to each other at the offset portion. In other words, at least one of the inner and outer ends of the first winding portion 71a (specifically, the coil ends 93 and 94 on the inner and outer layers) and the ends on the same side as the first winding portion 71a (specifically, the coil ends 93 and 94 on the inner and outer layers of the annular coil closest to the first winding portion 71a) are offset in the radial direction, and the winding portions 71a and 71b are connected to each other at the offset portion. Thus, as described above, the efficiency of the excitation of the rotor 60 can be improved, and the winding portions 71 a and 71 b arranged in the radial direction can be appropriately connected to each other.

[0092] In the cylindrical portion 61a of the rotor core 61, one end surface in the axial direction is used as the installation surface 65 for arranging the diode 81 and the capacitor 82. In addition, in the first winding portion 71a and the second winding portion 71b, the connection end portions connected to the diode 81 and the capacitor 82 are protruded in the axial direction to the same side as the installation surface 65, and the diode 81 and the capacitor 82 are connected to the protruding portions. As a result, in the rotor 60, the connection between each winding portion 71a, 71b and the diode 81 and the capacitor 82 becomes easy, and the resonance circuit composed of these components can be appropriately formed.

[0093] (Other embodiments)

[0094] The above-described embodiment may be modified, for example, as follows.

[0095] You can also Fig.12 Change like this Figure 8 The winding construction described in . Fig.12 In the figure, the two layers (two layers of conductors) on the radially outer side are the first winding portion 71a, and the four layers (four layers of conductors) on the radially inner side are the second winding portion 71b. Here, in the first winding portion 71a, eight coil bodies 90 form a ring-shaped coil (serial winding portion) in the circumferential direction, and similarly in the second winding portion 71b, eight coil bodies 90 form a ring-shaped coil (serial winding portion) in the circumferential direction. However, in the first winding portion 71a and the second winding portion 71b, the number of layers in the radial direction of each coil body 90 is different. The number of layers of the coil body 90 of the first winding portion 71a is 2, and the number of layers of the coil body 90 of the second winding portion 71b is 4. Fig.12In the embodiment, the coil bodies 90 constituting the first winding portion 71a are C11, C12, C13, ..., C18 in the clockwise direction. In addition, the coil bodies 90 constituting the second winding portion 71b are C21, C22, C23, ..., C28 in the clockwise direction.

[0096] In this way, the number of radial layers of each coil body 90 may be other than two, or may be a multiple of two.

[0097] As a structure for connecting the first winding portion 71a and the second winding portion 71b, instead of connecting the winding portions 71a and 71b through a transition portion 95 provided at the coil ends 93 and 94 of each winding portion 71a and 71b, a structure for connecting the winding portions 71a and 71b using a relay line may be used.

[0098] The coil body 90 may be configured to use a round wire as a conductor material instead of a rectangular wire. The coil body 90 may be a coil other than an α-winding coil. For example, an edgewise-wound coil may be used as the coil body 90 .

[0099] The rotating electric machine is not limited to an inner rotor type rotating electric machine, and may be an outer rotor type rotating electric machine. In this case, the main pole portion 62 protrudes radially inward from the annular yoke portion of the rotor core. In the field winding 70, the first winding portion 71a is arranged radially inward (stator 50 side), and the second winding portion 71b is arranged radially outward (opposite to the stator side).

[0100] The rotating electric machine is not limited to a star-connected rotating electric machine, and may be a Δ-connected rotating electric machine.

[0101] The stator core may be a stator core not provided with teeth.

[0102] The structure for passing the excitation current through the excitation winding is not limited to Figure 4 The circuit shown may also be a structure including, for example, a brush electrically connected to the field winding and a power source electrically connected to the brush. In this case, the control device 30 controls the field current flowing through the field winding by increasing the output voltage of the power source electrically connected to the brush when the rotor 60 is in a high rotation state. In addition, when the brush is used, it is not necessary to flow the high-order harmonic current for inducing the field current through the stator winding.

[0103] The rotating electric machine is not limited to one used as an on-vehicle main machine, and may be, for example, an ISG (Intergrated Starter Generator) used as a motor and generator.

[0104] The mobile body equipped with the rotating electric machine 40 is not limited to a vehicle, and may be, for example, an airplane or a ship. In addition, the system including the rotating electric machine 40 is not limited to a system mounted on a mobile body, and may be a stationary system.

[0105] The following describes technical ideas extracted from the above-mentioned embodiments.

[0106] [Structure 1]

[0107] A winding excitation rotor (60) is applied to a winding excitation type rotating electric machine (40), the winding excitation rotor comprising: a rotor core (61) having a main pole portion (62) provided at each magnetic pole arranged in the circumferential direction and protruding in the radial direction; and an excitation winding (70) wound around the main pole portion.

[0108] The field winding has a coil body (90) formed by winding a conductive wire material in multiple layers in the radial direction around each main pole portion, and the coil bodies are connected in series in the circumferential direction.

[0109] Each coil body has an inner end portion (93) which is one end of the conductive wire material at a position radially inside the coil body, and an outer end portion (94) which is the other end of the conductive wire material at a position radially outside the coil body.

[0110] In the coil body, the inner end portion is connected to the inner end portion of another coil body adjacent to one side in the circumferential direction, and the outer end portion is connected to the outer end portion of another coil body adjacent to the other side in the circumferential direction.

[0111] [Structure 2]

[0112] According to the winding excitation rotor of structure 1,

[0113] At least one of the inner end portion and the outer end portion of each of the coil bodies adjacent to each other in the circumferential direction has an extending portion extending in the circumferential direction toward one side of the coil body to be connected.

[0114] [Structure 3]

[0115] According to the winding excitation rotor of structure 1,

[0116] The coil body is an α-winding coil using a rectangular wire as the conductor material and having an inner coil portion (91) as the radial inner side and an outer coil portion (92) as the radial outer side.

[0117] The inner coil portion is provided with the inner end portion, and the outer coil portion is provided with the outer end portion,

[0118] At least one of the inner end portion and the outer end portion of each of the coil bodies adjacent to each other in the circumferential direction has an extending portion extending in the circumferential direction toward one side of the coil body to be connected.

[0119] [Structure 4]

[0120] The winding excitation rotor according to structure 2 or 3,

[0121] In the coil bodies adjacent to each other in the circumferential direction, the joints at the inner end and the outer end are arranged alternately in the circumferential direction at intervals of one magnetic pole pitch.

[0122] [Structure 5]

[0123] A winding excitation rotor according to any one of structures 1 to 4,

[0124] The field winding includes a plurality of series winding portions formed by connecting in series the coil bodies wound around the main pole portions arranged in the circumferential direction and circling the rotor. The field winding is formed by connecting in series the series winding portions arranged in the radial direction.

[0125] [Structure 6]

[0126] According to the winding excitation rotor of structure 5,

[0127] At least one of the inner end portions of the radially outer series winding portions and the inner end portions of the radially inner series winding portions arranged radially is offset radially, or at least one of the outer end portions of the radially outer series winding portions and the outer end portions of the radially inner series winding portions arranged radially is offset radially, and the series winding portions are connected to each other at the offset portions.

[0128] [Structure 7]

[0129] A winding excitation rotor according to any one of structures 1 to 4,

[0130] The field winding has a first winding portion (71a) and a second winding portion (71b) connected in series with each other.

[0131] A rectifier element (81) is connected between both ends of the first winding portion and the second winding portion, and a capacitor (82) is connected in parallel to the second winding portion (71b).

[0132] The first winding portion and the second winding portion are respectively series winding portions formed by connecting in series the coil bodies wound around the main pole portions arranged in the circumferential direction at least once around the rotor, and the first winding portion is wound around the main pole portions on one side of the stator (50) of the rotating electrical machine in the radial direction, and the second winding portion is wound on the stator on the opposite side.

[0133] Any one of the inner end and the outer end of the first winding portion, and at least any one of the inner end and the outer end of the second winding portion on the same side as the first winding portion are radially offset, and the first winding portion and the second winding portion are connected at the offset portion.

[0134] [Structure 8]

[0135] According to the winding excitation rotor of structure 7,

[0136] The rotor core has a yoke portion (61a) extending in the circumferential direction, and the main pole portion protrudes radially from the yoke portion.

[0137] In the yoke part, one axial end surface serves as a setting surface (65) for arranging the rectifying element and the capacitor.

[0138] In the first winding portion and the second winding portion, the connection end portions connected to the rectifying element and the capacitor protrude toward the same side as the installation surface in the axial direction, and are connected to the rectifying element and the capacitor at the protruding portions.

[0139] The present invention has been described based on the embodiments. However, it should be understood that the present invention is not limited to the embodiments and structures. The present invention also includes various modifications and modifications within the equivalent range. In addition, although the present invention discloses various combinations and modes, other combinations and modes including only one element among these, or including the above elements or the following elements are also within the scope and thought of the present invention.

Claims

1. A winding excitation rotor (60) applied to a winding excitation type rotating electric machine (40), the winding excitation rotor comprising: a rotor core (61) having a main pole portion (62) provided at each magnetic pole arranged in the circumferential direction and protruding in the radial direction; and an excitation winding (70) wound around the main pole portion, characterized in that: The field winding has a coil body (90) formed by winding a conductive wire material in multiple layers in the radial direction around each main pole portion, and the coil bodies are connected in series in the circumferential direction. Each coil body has an inner end portion (93) which is one end of the conductive wire material at a position radially inside the coil body, and an outer end portion (94) which is the other end of the conductive wire material at a position radially outside the coil body. In the coil body, the inner end portion is connected to the inner end portion of another coil body adjacent to one side in the circumferential direction, and the outer end portion is connected to the outer end portion of another coil body adjacent to the other side in the circumferential direction.

2. The winding excitation rotor according to claim 1, characterized in that: At least one of the inner end portion and the outer end portion of each of the coil bodies adjacent to each other in the circumferential direction has an extending portion extending in the circumferential direction toward one side of the coil body to be connected.

3. The winding excitation rotor according to claim 1, characterized in that: The coil body is an α-winding coil using a rectangular wire as the conductor material and having an inner coil portion (91) as the radial inner side and an outer coil portion (92) as the radial outer side. The inner coil portion is provided with the inner end portion, and the outer coil portion is provided with the outer end portion, At least one of the inner end portion and the outer end portion of each of the coil bodies adjacent to each other in the circumferential direction has an extending portion extending in the circumferential direction toward one side of the coil body to be connected.

4. The winding excitation rotor according to claim 2 or 3, characterized in that: In the coil bodies adjacent to each other in the circumferential direction, the joints at the inner end and the outer end are arranged alternately in the circumferential direction at intervals of one magnetic pole pitch.

5. The winding excitation rotor according to claim 1, characterized in that: The field winding includes a plurality of series winding portions formed by connecting in series the coil bodies wound around the main pole portions arranged in the circumferential direction and circling the rotor. The field winding is formed by connecting in series the series winding portions arranged in the radial direction.

6. The winding excitation rotor according to claim 5, characterized in that: At least one of the inner end portions of the radially outer series winding portions and the inner end portions of the radially inner series winding portions arranged radially is offset radially, or at least one of the outer end portions of the radially outer series winding portions and the outer end portions of the radially inner series winding portions arranged radially is offset radially, and the series winding portions are connected to each other at the offset portions.

7. The winding excitation rotor according to claim 1, characterized in that: The field winding has a first winding portion (71a) and a second winding portion (71b) connected in series with each other. A rectifier element (81) is connected between both ends of the first winding portion and the second winding portion, and a capacitor (82) is connected in parallel to the second winding portion (71b). The first winding portion and the second winding portion are respectively series winding portions formed by connecting in series the coil bodies wound around the main pole portions arranged in the circumferential direction at least once around the rotor, and the first winding portion is wound around the main pole portions on one side of the stator (50) of the rotating electrical machine in the radial direction, and the second winding portion is wound on the stator on the opposite side. Any one of the inner end and the outer end of the first winding portion, and at least any one of the inner end and the outer end of the second winding portion on the same side as the first winding portion are radially offset, and the first winding portion and the second winding portion are connected at the offset portion.

8. The winding excitation rotor according to claim 7, characterized in that: The rotor core has a yoke portion (61a) extending in the circumferential direction, and the main pole portion protrudes radially from the yoke portion. In the yoke part, one axial end surface serves as a setting surface (65) for arranging the rectifying element and the capacitor. In the first winding portion and the second winding portion, the connection end portions connected to the rectifying element and the capacitor protrude toward the same side as the installation surface in the axial direction, and are connected to the rectifying element and the capacitor at the protruding portions.

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