Winding excitation type rotating electric machine

Abstract

The invention provides a winding excitation type rotating electric machine which can ensure insulation between connecting wires, thin a coil film and improve the duty factor of a conductor in a slot. The winding excitation type rotating electric machine (100) is provided with a stator (101) and a rotor (102) arranged to face the stator (101) in the radial direction. A rotor (102) is provided with: a rotor core (2) having a plurality of teeth (20 (20a-20h)) and a plurality of grooves (21 (21a-21h)) arranged in the circumferential direction; and a coil (3) wound around each tooth (20) as a field winding. The coil (3) is provided with: a one-side connecting wire (32) which is disposed along one end surface (2a) in the axial direction of the rotor core (2) and which connects two winding sections (34) wound in a concentrated manner on each of the two teeth (20); and a connecting wire (33) on the other side, which is disposed along the other end surface (2b) of the rotor core (2) in the axial direction, and which connects two winding parts (34) wound in a concentrated manner on each of the two teeth (20).

Description

Technical Field

[0001] The present invention relates to a winding-excitation type rotating electric machine. Background Art

[0002] Conventionally, there is known a winding-excitation type rotating electric machine having a coil concentratedly wound around each tooth of a rotor core (for example, refer to Patent Document 1).

[0003] Patent Document 1 discloses a winding field type rotating electric machine including a stator and a rotor in which coils serving as field windings are concentratedly wound around respective pole cores (teeth).

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Laid-Open No. 11-18337

[0007] Among them, although it is not clearly described in the above-mentioned patent document 1, in the field of winding excitation type rotating electric machines, the winding parts of the coils wound around the teeth are connected to each other by connecting wires arranged along one end face of the axial direction of the rotor core. In the case where the rotor has a plurality of such connecting wires located on one end face of the axial direction of the rotor core, the connecting wires will contact each other at one end face of the axial direction of the rotor core. In this case, it is necessary to thicken the coil coating to ensure the insulation of the connecting wires. In the case of thickening the coil coating, the space factor of the conductor in the slot is reduced, so it is expected to be improved. Summary of the invention

[0008] The present invention has been made to solve the above-mentioned problems, and one object of the present invention is to provide a winding-excitation type rotating electric machine capable of ensuring insulation between connecting wires, making the coil coating thinner, and improving the space factor of the conductor in the slot.

[0009] In order to achieve the above-mentioned purpose, a winding excitation type rotating electric machine in one aspect of the present invention has: a stator; and a rotor, which is arranged in a manner opposite to the stator in the radial direction. The rotor includes: a rotor core, which has a plurality of teeth and a plurality of slots arranged in the circumferential direction; and a coil, which is wound around each tooth as an excitation winding. The coil includes: a connecting wire on one side, which is arranged along an axial end face of the rotor core and connects two first winding parts that are concentratedly wound on each tooth of two teeth that are not adjacent to each other; and a connecting wire on the other side, which is arranged along the other axial end face of the rotor core and connects two second winding parts that are concentratedly wound on each tooth of two teeth that are not adjacent to each other and are different from the first winding parts.

[0010] In a winding excitation type rotating electric machine according to one aspect of the present invention, as described above, a one-side connecting wire and a other-side connecting wire are provided on the coil, the one-side connecting wire is arranged along one end face of the axial direction of the rotor core, and connects two first winding parts that are concentratedly wound on each tooth of two teeth that are not adjacent to each other, and the other-side connecting wire is arranged along the other end face of the axial direction of the rotor core, and connects two second winding parts that are concentratedly wound on each tooth of two teeth that are not adjacent to each other. Thus, by configuring the one-side connecting wire on one side of the axial direction of the rotor core and the other-side connecting wire on the other side of the axial direction of the rotor core, the connecting wires that were previously only arranged on one side of the axial direction of the rotor core can be dispersed and arranged on both sides of the axial direction, so that the connecting wires can be prevented from contacting each other. Therefore, it is not necessary to consider ensuring the insulation at the position where the connecting wires contact each other, so the insulation of the connecting wires (one-side connecting wire, other-side connecting wire) can be ensured, and the coil coating can be made thinner, so that the space factor of the conductor in the slot is improved. Furthermore, as the space factor of the conductor in the slot increases, the axial size of the motor (rotor) can be reduced and miniaturized while still achieving the same function. That is, the total thickness of the plurality of electromagnetic steel sheets stacked to form the rotor core can be reduced.

[0011] In the winding excitation type rotating electric machine of one aspect mentioned above, it is preferred that the coil has a plurality of one-side connecting wires and a plurality of other-side connecting wires, and the coil is a structure of a continuous one wound around a plurality of teeth, and the first winding portion and the one-side connecting wire of the coil are alternately and continuously formed between the one-end lead portion of the coil introduced into the tooth where the winding starts and a specified midway position of the coil, and the second winding portion and the other-side connecting wire of the coil are alternately and continuously formed between the other-end lead portion of the coil led out from the tooth where the winding ends and a specified midway position of the coil.

[0012] According to such a structure, the number of parts can be reduced and the device structure can be simplified compared to the case where there are multiple coils. In addition, on the lead side at one end, the coil winding operation can be performed only by alternately and repeatedly forming the first winding portion and the one side connecting wire, and on the lead side at the other end, the coil winding operation can be performed only by alternately and repeatedly forming the second winding portion and the other side connecting wire. That is, since the operation stage of forming the one side connecting wire and the operation stage of forming the other side connecting wire can be separated, the workability can be improved compared to the case of repeatedly forming the winding portion, the one side connecting wire, and the other side connecting wire.

[0013] In this case, it is preferable that the teeth around which the one end lead portion is wound and the teeth around which the other end lead portion is wound are arranged separately with at least one tooth interposed therebetween in the circumferential direction.

[0014] According to such a structure, in the coil, the lead wires at one end and the lead wires at the other end have a long coil length, resulting in a particularly large voltage difference due to the internal resistance of the coil, and the lead wires at one end and the lead wires at the other end are separated by sandwiching at least one tooth, thereby ensuring insulation.

[0015] In the structure as a continuous coil wound around the plurality of teeth, it is preferred that the tooth has a first tooth and a second tooth adjacent to each other, and the slot has a middle slot disposed between the first tooth and the second tooth. The coil is wound around the first tooth in such a manner that the number of turns on the middle slot side in the circumferential direction of the first tooth is only one turn more than the number of turns on the side opposite to the middle slot side in the circumferential direction of the first tooth, and is wound around the second tooth in such a manner that the number of turns on the middle slot side in the circumferential direction of the second tooth is only one turn less than the number of turns on the side opposite to the middle slot side in the circumferential direction of the second tooth, and the number of turns on the side opposite to the middle slot side in the circumferential direction of the first tooth and the number of turns on the side opposite to the middle slot side in the circumferential direction of the second tooth are the same number.

[0016] According to such a structure, when the coil is led out from one side to the other side in the axial direction in order to form a one-side connecting wire and another-side connecting wire, in the winding portion of the first tooth, the number of turns is different on one side (middle slot side) and the other side in the circumferential direction, but in the winding portion of the second tooth, the number of turns is also different on one side and the other side (middle slot side) in the circumferential direction, so that the total number of turns in the middle slot can be made consistent with the total number of turns in other slots. In short, the deviation of the number of turns in the middle slot at the winding portion of the second tooth can be corrected by the deviation of the number of turns in the middle slot at the winding portion of the first tooth. As a result, it is possible to suppress the balance from being destroyed when the rotor rotates.

[0017] Regarding the above-mentioned winding-field type rotating electrical machine, the following structure is also conceivable.

[0018] (Appendix 1)

[0019] In the above-mentioned winding excitation type rotating electric machine, it is preferred that, on the winding portion of the first tooth, a connecting wire on one side is connected on an axial end face side and from the middle slot side in the circumferential direction, and a connecting wire on the other side is connected on the other axial end face side and from the middle slot side in the circumferential direction, and that, on the winding portion of the second tooth, an end lead portion or the other end lead portion is connected on an axial end face side and from the side opposite to the middle slot side in the circumferential direction, and a connecting wire on the other axial end face side and from the side opposite to the middle slot side in the circumferential direction.

[0020] According to such a configuration, the deviation in the number of turns in the middle slot in the winding portion of the first tooth can be corrected in the winding portion of the second tooth to which the one end lead portion or the other end lead portion is connected, thereby suppressing the loss of balance during the rotation of the rotor.

[0021] (Supplementary Item 2)

[0022] In the structure of a continuous coil wound around the above-mentioned multiple teeth, it is preferred that the multiple one-side connecting wires are arranged separately from each other without contacting each other on one end face side in the axial direction, and the multiple other-side connecting wires are arranged separately from each other without contacting each other on the other end face side in the axial direction.

[0023] According to such a configuration, the insulation between the plurality of one-side connecting wires and the plurality of other-side connecting wires can be ensured, so that the insulation between the connecting wires can be ensured and the coil coating can be made thinner, thereby further improving the space factor of the conductor in the slot. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a diagram showing a rotor and a stator of a winding field type rotating electrical machine according to an embodiment from a radial direction.

[0025] Figure 2 This is a partially enlarged view showing a cross section of slots and coils of a rotor of a winding-field type rotating electrical machine according to an embodiment, as viewed from one side in the axial direction.

[0026] Figure 3 This is a diagram showing a portion (a portion on the winding start side) having a connecting wire on one side of a coil of a winding-excitation type rotating electrical machine according to an embodiment, as viewed from one side in the axial direction.

[0027] Figure 4 This is a diagram showing a portion (a portion on the winding end side) having a connecting wire on the other side of the coil of the winding field type rotating electrical machine according to the embodiment, as viewed from one side in the axial direction.

[0028] Figure 5 This is a schematic diagram for explaining a method of winding a coil around each tooth of the winding field type rotating electrical machine according to the embodiment.

[0029] Description of Reference Numerals

[0030] 2 rotor core

[0031] 2a One end surface (of the rotor core)

[0032] 2b (Other end surface of the rotor core)

[0033] 3 coils

[0034] 20, 20a~20h (rotor core) teeth

[0035] 21, 21a~21h (rotor core) slots

[0036] 30 Lead wire at one end

[0037] 31 Other end lead

[0038] 32 One side connection line

[0039] 33 Other side connection line

[0040] 34 Winding section

[0041] 100 Winding-excited rotating electrical machine

[0042] 101 Stator

[0043] 102 Rotor

[0044] M (specified) midway position of the coil

[0045] S Middle groove

[0046] T1 First tooth

[0047] T2 Second tooth DETAILED DESCRIPTION

[0048] Hereinafter, embodiments will be described based on the drawings.

[0049] [Implementation Method]

[0050] Reference Figure 1 to Figure 5 A winding field type rotating electrical machine 100 according to the embodiment will be described.

[0051] In each figure, the axial direction of the rotor shaft 1 is represented by the Z direction. The Z direction is a direction along the rotation center axis C of the rotor shaft 1. One direction of the Z direction is represented by the Z1 direction, and the other direction is represented by the Z2 direction. In addition, one axial end face 2a of the rotor core 2 is located on the Z1 direction side of the rotor 102. In addition, the other axial end face 2b of the rotor core 2 is located on the Z2 direction side of the rotor 102.

[0052] In each figure, the radial direction of the rotor shaft 1 is indicated by the R direction. The R direction is also the radial direction of the rotor 102. Of course, the R direction is the same as the diameter direction of the rotor 102.

[0053] In each figure, the circumferential direction of the rotor shaft 1 is represented by the r direction. One of the r directions is represented by the r1 direction, and the other direction is represented by the r2 direction. The r1 direction is the counterclockwise direction when the rotor 102 is viewed from the Z1 direction side, and the r2 direction is the clockwise direction. In addition, the coil 3 of the rotor 102 is wound around the plurality of teeth 20a to 20f in sequence in a manner moving along the r1 direction from the tooth 20a as the winding start position toward the tooth 20f as the winding end position. Details of the order of winding the coil 3 will be described later.

[0054] like Figure 1 As shown, the winding field type rotating electrical machine 100 has a stator 101 and a rotor 102 .

[0055] The rotor 102 is arranged to face the stator 101 in the radial direction. Specifically, the rotor 102 is arranged to face the stator 101 at a predetermined gap inwardly in the radial direction. That is, the winding field type rotating electric machine 100 is a radial gap type rotating electric machine. In addition, the winding field type rotating electric machine 100 is an inner rotor type rotating electric machine.

[0056] The winding excitation type rotating electric machine 100 is an electrically excited synchronous motor (EESM) having a winding (coil)-shaped rotor 102. The excitation winding of the rotor 102, i.e., the coil 3 (winding), is configured to generate a magnetic field by supplying current via brushes and slip rings. In addition, the rotor 102 is a structure that functions as an electromagnet without a permanent magnet.

[0057] (Structure of stator)

[0058] The stator 101 includes an annular stator core 101 a and a coil 101 b disposed on the stator core 101 a .

[0059] The stator core 101a is configured by stacking a plurality of electromagnetic steel sheets in the axial direction (Z direction) and allowing magnetic flux to pass through. The coil 101b of the stator 101 is configured to be connected to an external power supply unit and supplied with current (for example, three-phase AC current). Furthermore, the coil 101b of the stator 101 is configured to generate a magnetic field by being supplied with current.

[0060] (Rotor Structure)

[0061] like Figure 1 As shown, the rotor 102 includes a rotor shaft 1, a rotor core 2, and teeth 20a to 20h wound around the rotor core 2 (see Figure 3 , Figure 4 ) as the coil 3 of the excitation winding.

[0062] (Structure of rotor shaft of rotor)

[0063] The rotor shaft 1 is a shaft portion that serves as the rotation center of the winding field type rotating electrical machine 100. The rotor shaft 1 is formed in a round rod shape having a circular outer peripheral surface. The rotor shaft 1 is inserted into the shaft insertion hole 22a (see Figure 4 ).

[0064] (Structure of rotor core of rotor)

[0065] The rotor core 2 is formed by laminating a plurality of electromagnetic steel sheets in the axial direction (Z direction) and is configured to allow magnetic flux to pass therethrough.

[0066] like Figure 3 and Figure 4As shown, the rotor core 2 has a plurality of (eight) teeth 20 ( 20 a to 20 h ) arranged in the circumferential direction (r direction), a plurality of (eight) slots 21 ( 21 a to 21 h ) arranged in the circumferential direction, and an annular portion 22 .

[0067] In the description of the present embodiment, the tooth 20 is used when referring to a general term for a plurality of teeth or an unspecified one of the plurality of teeth. The teeth 20a to 20h are used when referring to a specific one of the plurality of teeth.

[0068] Similarly, in the description of this embodiment, when referring to a general term of a plurality of grooves or an unspecified one of the plurality of grooves, groove 21 is used. When referring to a specific one of the plurality of grooves, grooves 21a to 21h are used.

[0069] The annular portion 22 is provided with a shaft insertion hole 22 a and extends along the outer peripheral surface of the rotor shaft 1 .

[0070] The teeth 20a to 20h protrude radially outward from the annular portion 22. The teeth 20a to 20h are arranged at equal angular intervals in the circumferential direction. When viewed from one side in the axial direction, the teeth 20a to 20h are arranged adjacent to each other in the r1 direction in the order of teeth 20a, 20b, 20c, 20d, 20e, 20f, 20g, and 20h. The tooth 20h is adjacent to the tooth 20a on the r2 direction side.

[0071] The teeth 20 include a first tooth T1 and a second tooth T2 adjacent to each other. The first tooth T1 and the second tooth T2 correspond to the tooth 20g and the tooth 20f, respectively. The first tooth T1 and the second tooth T2 will be described in detail later.

[0072] The slot 21 is a space portion sandwiched between two teeth 20 adjacent in the circumferential direction, and is a space for passing the coil 3 extending in the axial direction relative to the rotor core 2. When viewed from one side in the axial direction, the slots 21a to 21h are arranged adjacent to each other in the r1 direction in the order of slots 21a, 21b, 21c, 21d, 21e, 21f, 21g, and 21h. The slots 21a to 21h are arranged adjacent to the r1 direction sides of the teeth 20a to 20h, respectively.

[0073] The slot 21 includes an intermediate slot S disposed between the first tooth T1 (tooth 20g) and the second tooth T2 (tooth 20f). The intermediate slot S is a structure equivalent to the above-mentioned slot 21f. The details of the intermediate slot S will be described later.

[0074] (Structure of rotor coil)

[0075] The coil 3 is a continuous structure wound around a plurality of teeth 20a to 20h. Therefore, in the winding excitation type rotating electric machine 100, only two lead portions (one end lead portion 30 and the other end lead portion 31) are provided. As an example, the coil 3 is a so-called round wire whose cross section perpendicular to the longitudinal direction is circular. The coil 3 is composed of a conductor formed by a conductive member and a coil coating formed by an insulating material and covering the conductor. In addition, the thinner the coil coating, the higher the space factor of the conductor in the slot 21.

[0076] The coil 3 passes through the slot paper 23 in the slot 21 (see Figure 2 ) ensures insulation from the rotor core 2. In addition, in one slot 21 disposed between two teeth 20, the coil 3 ensures a predetermined insulation distance D (creepage distance or space distance) (see Figure 2 ). In addition, the coil may include a predetermined insulating member disposed between a winding portion wound around the one tooth and a winding portion wound around the other tooth.

[0077] The coil 3 is sequentially wound around each tooth 20 by so-called concentrated winding. Therefore, the coil 3 forms a winding portion 34 wound intensively around each tooth 20. The winding portion 34 is a portion where the coil 3 is wound in a ring shape around each tooth 20 by concentrated winding.

[0078] The coil 3 includes a one-side connection line 32 and a second-side connection line 33. The coil 3 has a plurality of one-side connection lines 32 and a plurality of second-side connection lines 33.

[0079] The one-side connecting wire 32 is arranged along one axial end face 2a (end face in the Z1 direction) of the rotor core 2, and connects two winding portions 34 wound intensively on each of the two teeth 20. The other-side connecting wire 33 is arranged along the other axial end face 2b (end face in the Z2 direction) of the rotor core 2, and connects two winding portions 34 wound intensively on each of the two teeth 20.

[0080] The plurality of one-side connecting wires 32 are arranged to be separated from each other without contacting each other on the one end face 2a side in the axial direction (Z1 direction side). The plurality of one-side connecting wires 32 are arranged to be separated from each other in the circumferential direction. In short, the plurality of one-side connecting wires 32 are not in contact with each other, and insulation is ensured.

[0081] In addition, the plurality of other side connection wires 33 are arranged separately from each other without contacting each other on the other end face 2b side (Z2 direction side) in the axial direction. The plurality of other side connection wires 33 are arranged separately in the circumferential direction. In short, the plurality of other side connection wires 33 do not contact each other, and insulation is ensured.

[0082] Between the lead wire portion 30 at one end of the coil 3 introduced into the tooth 20a where the winding starts and the predetermined midway position M of the coil 3, the winding portion 34 of the coil 3 and the one side connecting wire 32 are formed alternately and continuously. In addition, between the lead wire portion 31 at the other end of the coil 3 led out from the tooth 20f where the winding ends and the predetermined midway position M of the coil 3, the winding portion 34 of the coil 3 and the other side connecting wire 33 are formed alternately and continuously. The above-mentioned "predetermined midway position M of the coil 3" refers to the winding portion 34 wound on the tooth 20g.

[0083] In summary, in one coil 3 , the portion on the lead wire 30 side at one end in the longitudinal direction is used to form the winding portion 34 and one side connection wire 32 , and the portion on the lead wire 31 side at the other end in the longitudinal direction is used to form the winding portion 34 and the other side connection wire 33 .

[0084] The tooth 20a around which the one-end lead portion 30 is wound and the tooth 20f around which the other-end lead portion 31 is wound are arranged separately in the circumferential direction (r direction) with at least one tooth 20 sandwiched therebetween. In addition, the one-end lead portion 30 and the other-end lead portion 31 are arranged on opposite sides of each other in the diameter direction (radial direction (R direction)) of the rotor 102.

[0085] Specifically, the tooth 20 a around which the one-end lead portion 30 is wound and the tooth 20 f around which the other-end lead portion 31 is wound are arranged to be separated from each other with the teeth 20 g and 20 h interposed therebetween in the circumferential direction.

[0086] In short, since the winding portion 34 of the tooth 20a where winding starts and the winding portion 34 of the tooth 20f where winding ends are far apart in the length direction of the coil 3, the potential difference between them becomes particularly large due to the influence of the internal resistance of the coil 3. Therefore, the coil 3 is configured so that the winding portion 34 of the tooth 20a where winding starts and the winding portion 34 of the tooth 20f where winding ends are not arranged close to each other in the circumferential direction (r direction), but are arranged far apart.

[0087] (Regarding the method of winding the coil around each tooth of the rotor)

[0088] Next, refer to Figure 2 , Figure 3 and Figure 5 , a method of winding the coil 3 around each of the teeth 20 a to 20 h of the rotor 102 will be described.

[0089] The number of turns of the winding portion 34 is set to N for explanation. The number of turns N refers to the number of coil portions (slot accommodating portions) on one side of the tooth 20. The total number of turns in each slot 21a to 21h is 2×N. In addition, if the number of turns of only one slot is slightly different from the number of turns of all other slots, the magnetic balance and mechanical balance of the rotor in the circumferential direction are destroyed. Therefore, when the rotor rotates, it becomes a cause of abnormal noise, vibration, etc., which is not preferable.

[0090] In addition, Figure 3 and Figure 4 In order to simplify the drawings and facilitate understanding, the number of turns N of the coil 3 is set to 2 for illustration. Figure 2 As shown, the number of turns of coil 3 is greater than Figure 3 and Figure 4 The number of turns N is shown.

[0091] In addition, the figure shows the rotor 102 from the axial direction. Figure 3 and Figure 4 Although it can be represented by one figure, in order to reduce the overlap of the coil 3 and make it easier to understand, it is divided into two figures for illustration. Figure 3 The A1 section shown and Figure 2 In the shown portion A2, the coil 3 is continuous.

[0092] The order of the teeth 20 of the wound coil 3 is tooth 20a at the start of winding, tooth 20c, tooth 20e, tooth 20g (first tooth T1), tooth 20h, tooth 20b, tooth 20d, and tooth 20f (second tooth T2) at the end of winding.

[0093] In addition, the coil 3 is wound around the teeth 20 so that the winding direction of the coil 3 in one slot 21 is consistent. In short, when the rotor 102 is viewed from the radially outer side, the winding direction of the winding portion 34 of the teeth 20a, 20c, 20e, and 20g is the counterclockwise direction, and the winding direction of the winding portion 34 of the teeth 20b, 20d, 20f, and 20h is the clockwise direction. As a result, the coil portions (slot accommodating portions) in the adjacent slots 21 form magnetic fields that are alternately reversed in the circumferential direction.

[0094] Hereinafter, the steps from the start to the end of winding the coil 3 will be described in order.

[0095] First, the one-end lead portion 30 is introduced into the tooth 20 a from the Z1 direction side and is concentratedly wound, thereby forming the wound portion 34 on the tooth 20 a.

[0096] Next, a connecting line 32 on one side connecting the teeth 20 a and 20 c is formed along one end surface 2 a (Z1 direction) of the rotor core 2 .

[0097] Next, the coil 3 from one side of the jumper wire 32 is introduced into the tooth 20 c from the Z1 direction side and is concentratedly wound, thereby forming the winding portion 34 on the tooth 20 c.

[0098] Next, a one-side connecting line 32 connecting the teeth 20 c and the teeth 20 e is formed along one end surface 2 a of the rotor core 2 .

[0099] Next, the coil 3 from one side of the jumper wire 32 is introduced into the tooth 20 e from the Z1 direction side and is concentratedly wound, thereby forming the winding portion 34 on the tooth 20 e.

[0100] Next, a one-side connecting line 32 connecting the tooth 20 e and the tooth 20 g (the first tooth T1 ) is formed along one end surface 2 a of the rotor core 2 .

[0101] Next, the coil 3 from one side of the jumper wire 32 is introduced into the tooth 20g (first tooth T1) from the Z1 direction side and is concentratedly wound thereon, thereby forming a winding portion 34 on the tooth 20g.

[0102] At this time, the coil 3 is wound around the first tooth T1 in such a manner that the number of turns on the middle slot S (slot 21f) side of the first tooth T1 in the circumferential direction is only one turn more than the number of turns on the side of the first tooth T1 in the circumferential direction opposite to the middle slot S side. Specifically, the number of turns on the side of the middle slot S in the circumferential direction of the first tooth T1 is set to N+1, and the number of turns on the side of the first tooth T1 in the circumferential direction opposite to the middle slot S side is set to N.

[0103] Therefore, the coil 3 is led out from the winding portion 34 of the tooth 20g (first tooth T1) toward the Z2 direction. In short, the winding portion 34 of the first tooth T1 is connected to the connecting wire 32 on one end face 2a in the axial direction and from the middle slot S in the circumferential direction, and is connected to the connecting wire 33 on the other end face 2b in the axial direction and from the middle slot S in the circumferential direction. In this way, the coil 3 is connected to the winding portion 34 of the first tooth T1 (the predetermined midway position M of the coil 3) from both sides in the axial direction.

[0104] Next, the other side connection line 33 connecting the tooth 20 g (first tooth T1 ) and the tooth 20 h is formed along the other end surface 2 b of the rotor core 2 .

[0105] Next, the coil 3 from the other-side jumper wire 33 is introduced into the tooth 20 h from the Z2 direction side and concentratedly wound thereon, thereby forming the winding portion 34 on the tooth 20 h.

[0106] Next, the other side connection line 33 connecting the teeth 20 h and 20 b is formed along the other end surface 2 b of the rotor core 2 .

[0107] Next, the coil 3 from the other-side jumper wire 33 is introduced into the tooth 20 b from the Z2 direction side and is concentratedly wound, thereby forming a winding portion 34 on the tooth 20 b.

[0108] Next, the other side connection line 33 connecting the teeth 20 b and 20 d is formed along the other end surface 2 b of the rotor core 2 .

[0109] Next, the coil 3 from the other-side jumper wire 33 is introduced into the tooth 20 d from the Z2 direction side and is concentratedly wound, thereby forming the winding portion 34 on the tooth 20 d.

[0110] Next, the other side connection line 33 connecting the teeth 20 d and 20 f is formed along the other end surface 2 b of the rotor core 2 .

[0111] Next, the coil 3 from the other-side jumper wire 33 is introduced into the tooth 20 f (second tooth T2 ) from the Z2 direction side and is wound intensively, thereby forming the winding portion 34 on the tooth 20 f.

[0112] At this time, the coil 3 is wound around the second tooth T2 in such a manner that the number of turns on the middle slot S (slot 21f) side in the circumferential direction of the second tooth T2 is only one turn less than the number of turns on the side opposite to the middle slot S side in the circumferential direction of the second tooth T2. Specifically, the number of turns on the middle slot S side in the circumferential direction of the second tooth T2 is set to N-1, and the number of turns on the side opposite to the middle slot S side in the circumferential direction of the second tooth T2 is set to N.

[0113] Therefore, the coil 3 is led out from the winding portion 34 of the tooth 20f (second tooth T2) toward the Z1 direction. In short, the other end lead portion 31 is connected to the winding portion 34 of the second tooth T2 on the one end face 2a side in the axial direction and from the side opposite to the middle slot S side in the circumferential direction, and the other side connection wire 33 is connected to the other end face 2b side in the axial direction and from the side opposite to the middle slot S side in the circumferential direction. In this way, the coil 3 is connected to the winding portion 34 of the second tooth T2 at both ends in the axial direction.

[0114] The winding is completed by leading out the other end lead portion 31 from the second tooth T2.

[0115] Here, the total number of turns of the coil 3 in the middle slot S (slot 21f) is considered. As described above, the number of turns of the first tooth T1 on the middle slot S side in the circumferential direction is N+1. In addition, as described above, the number of turns of the second tooth T2 on the middle slot S side in the circumferential direction is N-1. Therefore, the total number of turns of the coil 3 in the middle slot S is (N+1)+(N-1)=2×N. The total number of turns of the coil 3 in all other slots 21 except the middle slot S is also 2×N.

[0116] Furthermore, the number of turns of the first tooth T1 on the side opposite to the middle slot S in the circumferential direction and the number of turns of the second tooth T2 on the side opposite to the middle slot S in the circumferential direction are the same (both are N).

[0117] (Effects of Embodiments)

[0118] In this embodiment, the following effects can be obtained.

[0119] In the present embodiment, as described above, a one-side connecting wire 32 and a second-side connecting wire 33 are provided on the coil 3. The one-side connecting wire 32 is arranged along one axial end face 2a of the rotor core 2 and connects two winding portions 34 (the "first winding portion" in the claims) that are wound intensively on each tooth of two teeth 20 that are not adjacent to each other. The second-side connecting wire 33 is arranged along the other axial end face 2b of the rotor core 2 and connects two winding portions 34 (the "second winding portion" in the claims) that are wound intensively on each tooth of two teeth 20 that are not adjacent to each other. Thus, by configuring the one-side connecting wire 32 on one axial side (Z1 direction) of the rotor core 2 and configuring the second-side connecting wire 33 on the other axial side (Z2 direction) of the rotor core 2, the connecting wires that were previously arranged only on one axial side of the rotor core can be dispersed and arranged on both axial sides, thereby preventing the connecting wires from contacting each other. Therefore, it is not necessary to consider ensuring insulation at the position where the connecting wires contact each other, so the insulation between the connecting wires (one side connecting wire 32, the other side connecting wire 33) can be ensured, and the coil coating can be made thinner, so that the space factor of the conductor in the slot 21 can be improved. In addition, with the improvement of the space factor of the conductor in the slot 21, the axial size of the motor (rotor 102) can be reduced and miniaturized while performing the same function. That is, the total thickness of the plurality of electromagnetic steel sheets stacked to form the rotor core 2 can be reduced.

[0120] In the present embodiment, as described above, the coil 3 has a plurality of one-side connecting wires 32 and a plurality of other-side connecting wires 33, which are a structure that is wound around a plurality of teeth 20 in a continuous manner, and between the one-end lead portion 30 of the coil 3 introduced into the tooth 20 where the winding starts and a predetermined midway position M of the coil 3, the winding portion 34 and the one-side connecting wire 32 are alternately and continuously formed, and between the other-end lead portion 31 of the coil 3 led out from the tooth 20 where the winding ends and a predetermined midway position M of the coil 3, the winding portion 34 and the other-side connecting wire 33 are alternately and continuously formed. Thus, compared with the case where the coil is plural, the number of components can be reduced and the device structure can be simplified. In addition, on the one-end lead portion 30 side, the winding operation of the coil 3 can be performed only by alternately and repeatedly forming the winding portion 34 and the one-side connecting wire 32, and on the other-end lead portion 31 side, the winding operation of the coil 3 can be performed only by alternately and repeatedly forming the winding portion 34 and the other-side connecting wire 33. That is, since the operation stage of forming the one side connection line 32 and the operation stage of forming the other side connection line 33 can be separated, the workability can be improved compared with the case of repeatedly forming the winding portion, the one side connection line, and the other side connection line.

[0121] In the present embodiment, as described above, the tooth 20a around which the one-end lead portion 30 is wound and the tooth 20f around which the other-end lead portion 31 is wound are separated and arranged with at least one tooth (20g, 20h) sandwiched therebetween in the circumferential direction. Thus, in the coil 3, since the one-end lead portion 30 and the other-end lead portion 31 have a long coil length between each other, the voltage difference due to the internal resistance of the coil 3 is particularly large, and the insulation is ensured by separating them with at least one tooth (20g, 20h) sandwiched therebetween.

[0122] In the present embodiment, as described above, the tooth 20 includes the first tooth T1 (tooth 20g) and the second tooth T2 (tooth 20f) adjacent to each other, and the slot 21 includes the middle slot S (slot 21f) disposed between the first tooth T1 and the second tooth T2. The coil 3 is wound around the first tooth T1 so that the number of turns on the middle slot S side in the circumferential direction of the first tooth T1 is only one turn more than the number of turns on the side opposite to the middle slot S side in the circumferential direction of the first tooth T1, and is wound around the second tooth T2 so that the number of turns on the middle slot S side in the circumferential direction of the second tooth T2 is only one turn less than the number of turns on the side opposite to the middle slot S side in the circumferential direction of the second tooth T2, and the number of turns on the side opposite to the middle slot S side in the circumferential direction of the first tooth T1 and the number of turns on the side opposite to the middle slot S side in the circumferential direction of the second tooth T2 are the same number. Thus, when the coil 3 is led out from one side to the other side in the axial direction in order to form the one-side connecting wire 32 and the other-side connecting wire 33, the number of turns is different on one side (middle slot S side) and the other side in the circumferential direction in the winding portion 34 of the first tooth T1, but by making the number of turns different on one side and the other side (middle slot S side) in the circumferential direction in the winding portion 34 of the second tooth T2, the total number of turns in the middle slot S can be made consistent with the total number of turns in the other slots 21. In short, the deviation of the number of turns in the middle slot S at the winding portion 34 of the second tooth T2 can be corrected by the deviation of the number of turns in the middle slot S at the winding portion 34 of the first tooth T1. As a result, it is possible to suppress the balance of the rotor 102 from being destroyed when it rotates.

[0123] In the present embodiment, as described above, the winding portion 34 of the first tooth T1 is connected to the one side connection wire 32 on the one end face 2a side in the axial direction and from the middle slot S side in the circumferential direction, and the other side connection wire 33 is connected to the other end face 2b side in the axial direction and from the middle slot S side in the circumferential direction, and the winding portion 34 of the second tooth T2 is connected to the one end lead portion 30 or the other end lead portion 31 on the one end face 2a side in the axial direction and from the side opposite to the middle slot S side in the circumferential direction, and the other side connection wire 33 is connected to the other end face 2b side in the axial direction and from the side opposite to the middle slot S side in the circumferential direction. Thus, the deviation of the number of turns in the middle slot S in the winding portion 34 of the first tooth T1 can be corrected in the winding portion 34 of the second tooth T2 to which the one end lead portion 30 or the other end lead portion 31 is connected, and the balance of the rotor 102 during rotation can be suppressed from being disturbed.

[0124] In the present embodiment, as described above, the plurality of one-side connecting wires 32 are arranged to be separated from each other without contacting each other on the one end face 2a side in the axial direction, and the plurality of other-side connecting wires 33 are arranged to be separated from each other without contacting each other on the other end face 2b side in the axial direction. Thus, the insulation between the plurality of one-side connecting wires 32 and the plurality of other-side connecting wires 33 can be ensured, so that the insulation between the connecting wires can be ensured, and the coil coating can be made thinner, further improving the space factor of the conductor in the slot 21.

[0125] [Modifications]

[0126] The embodiments disclosed herein are illustrative in all aspects and should not be construed as restrictive. The scope of the present invention is indicated by the claims rather than the description of the embodiments described above, and includes all modifications (variations) within the meaning and scope equivalent to the claims.

[0127] For example, in the above embodiment, an example is shown in which the rotor core 2 has eight slots 21 and eight teeth 20, but the present invention is not limited thereto. In the present invention, the rotor core may have a number of slots and teeth other than eight.

[0128] In the above embodiment, the coil 3 is formed of a round wire, but the present invention is not limited thereto. In the present invention, the coil may be formed of a wire having a shape different from that of a round wire, such as a rectangular wire.

[0129] In addition, in the above embodiment, an example of a structure in which the winding portion 34 wound on the tooth 20 at the winding end position of the coil 3 is connected to the coil from both sides in the axial direction is shown, but the present invention is not limited to this. In the present invention, it is also possible to configure the winding portion wound on the tooth at the start of the winding of the coil instead of the tooth at the end of the winding of the coil, and connect the coil from both sides in the axial direction.

[0130] In addition, in the above-mentioned embodiment, an example in which the rotor has only one coil is shown, but the present invention is not limited to this. In the present invention, the rotor may have a plurality of coils.

Claims

1. A winding-excitation type rotating electrical machine, wherein: have: stator; as well as The rotor is arranged to be opposed to the stator in a radial direction. The rotor includes: a rotor core having a plurality of teeth and a plurality of slots arranged in a circumferential direction; and a coil as an excitation winding wound around each of the teeth. The coil comprises: a one-side connecting wire arranged along one end surface of the rotor core in the axial direction and connecting two first winding portions wound intensively on each of two teeth that are not adjacent to each other; and The other-side connecting wire is arranged along the other end surface of the rotor core in the axial direction, and connects two second winding portions different from the first winding portions and wound intensively around each of two teeth that are not adjacent to each other.

2. The winding-field type rotating electrical machine according to claim 1, wherein: The coil has a plurality of the one-side connecting wires and a plurality of the other-side connecting wires, and the coil is a structure that is wound around a continuous strand of a plurality of the teeth. The first winding portion of the coil and the one-side connecting wire are alternately and continuously formed between the one-end lead portion of the coil introduced into the tooth where winding starts and a predetermined midway position of the coil, and The second winding portion of the coil and the other-side connecting wire are alternately and continuously formed between the other end lead portion of the coil led out from the tooth where the winding ends and the predetermined midway position of the coil.

3. The winding-field type rotating electrical machine according to claim 2, wherein: The teeth around which the one end lead portion is wound and the teeth around which the other end lead portion is wound are arranged to be separated from each other in the circumferential direction with at least one of the teeth interposed therebetween.

4. The winding-field type rotating electrical machine according to claim 2, wherein: The teeth have a first tooth and a second tooth adjacent to each other, The groove has an intermediate groove disposed between the first tooth and the second tooth, The coil is composed of: The first tooth is wound around the first tooth so that the number of turns on the middle slot side in the circumferential direction of the first tooth is only one turn greater than the number of turns on the side opposite to the middle slot side in the circumferential direction of the first tooth. The second tooth is wound around the second tooth in such a manner that the number of turns on the middle slot side in the circumferential direction of the second tooth is less than the number of turns on the side opposite to the middle slot side in the circumferential direction of the second tooth by only one turn, The number of turns of the first tooth on the side opposite to the middle slot in the circumferential direction and the number of turns of the second tooth on the side opposite to the middle slot in the circumferential direction are the same.

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