JP5972154B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a rotating electrical machine.

  In order to increase the space factor of the coil in the motor, segment conductors made of rectangular conductors (linear conductors with a rectangular cross section) are placed in each slot of the stator core, and the tips of different segment conductors are joined together Techniques for forming coils are known. In addition, a technique for forming a distributed winding type coil by winding a conducting wire is known.

  For example, in Patent Document 1, a plurality of U-shaped segment conductors are arranged along the circumferential direction of the stator core, and the tip portions of two segment conductors adjacent in the circumferential direction are joined to each other to form a wave winding shape. Distributed winding coils are disclosed.

JP 2011-193600 A

  By the way, when a coil is formed by winding a single conducting wire, it is not easy to insert and arrange the wave-wound coil in the slot of the stator core, and it takes time to arrange the coil. Similarly, when using U-shaped segment conductors, it is necessary to insert each segment conductor into a slot and bend the tip portions to join the tip portions to each other. It is not easy to form a coil and place it in the slot. On the other hand, in consideration of the workability of coil arrangement, when the coil is inserted into the slot with an allowance in the length of the coil, the coil end may swell excessively and the motor may be increased in size. Moreover, since the resistance of the coil increases by the extra length, the loss due to the resistance increases.

  In addition, when a wave-like coil is formed by joining a plurality of segment conductors, depending on the joining method of the segment conductors, the current that circulates between the joining locations (locations joined by welding) (circulating current) May occur and a loss due to circulating current (circulating current loss) may occur. In addition, loss due to eddy current (eddy current loss) may occur. Therefore, it is necessary to reduce losses due to leakage magnetic flux (eddy current loss and circulating current loss).

  An object of the present invention is to provide a rotating device capable of easily disposing a stator coil on a stator core while suppressing an increase in the length of the stator coil and reducing losses such as eddy current loss and circulating current loss. It is to provide an electric machine.

  The present invention comprises a plurality of teeth extending radially inward, an annular stator core provided with a slot between adjacent teeth, and a plurality of conductor strands integrated into an L-shape, One straight portion of the L-shaped shape is inserted into the slot of the stator core, and the other straight portion of the L-shaped shape is arranged to extend in the circumferential direction of the stator core. A plurality of collective conductors are arranged along the circumferential direction of the stator core, and in different collective conductors, the tip part of the one straight line part in one collective conductor and the tip part of the other straight part in the other collective conductor are joined. A rotating electric machine comprising a stator coil constituted by the operation.

  Moreover, the said assembly conducting wire may be comprised by laminating | stacking the several conductor board which has an L-shaped shape.

  Moreover, the specific resistance of the conductor plate arranged outside the plurality of conductor plates may be larger than the specific resistance of the conductor plate arranged inside.

  The stator coil may constitute a wave-winding distributed winding coil.

  According to the present invention, it is possible to easily dispose the stator coil on the stator core while suppressing an increase in the length of the stator coil by joining the L-shaped collective conducting wires together. Moreover, an eddy current loss is reduced by comprising a collective conducting wire with a some conductor wire. Moreover, since the path | route which suppresses circulating current is ensured by the L-shaped collective conducting wire, it becomes possible to reduce circulating current loss.

It is sectional drawing which shows an example of the rotary electric machine which concerns on embodiment of this invention. It is a perspective view which shows an example of the stator core which concerns on embodiment of this invention. It is a figure which shows an example of the stator coil which concerns on embodiment of this invention. It is a perspective view which shows an example of the assembly conducting wire which concerns on embodiment of this invention. It is AA sectional drawing of FIG. It is sectional drawing which shows another example of an assembly conducting wire. 6 is a view showing a stator coil according to Comparative Example 1. FIG. 6 is a view showing a stator coil according to Comparative Example 2. FIG. 10 is a view showing a stator coil according to Comparative Example 3. FIG. It is a figure for demonstrating the effect by the assembly conducting wire which concerns on this embodiment. It is a figure for demonstrating the effect by the assembly conducting wire which concerns on this embodiment.

  A rotating electrical machine according to an embodiment of the present invention will be described with reference to FIGS. A rotating electrical machine 1 according to this embodiment is a three-phase AC synchronous motor as an example, and includes a stator 2 and a rotor 4 as shown in FIG. As shown in FIG. 2, the stator 2 includes an annular stator core 21 that is a laminate of a plurality of electromagnetic steel plates, and a plurality of teeth 22 that protrude radially inward from the stator core 21. A slot 23 is provided between adjacent teeth 22. A stator coil 3 is wound around the stator 2. The rotor 4 is connected to the shaft 5 and disposed inside the stator 2. The rotor 4 includes a rotor core 41 and a permanent magnet 42 that are a laminate of a plurality of electromagnetic steel plates. A three-phase cable (not shown) consisting of a U-phase cable, a V-phase cable and a W-phase cable is connected to the stator coil 3, and a motor control current for outputting the torque specified by the torque command value is transmitted via the three-phase cable to the stator. It is supplied to the coil 3.

  The stator 2 according to the present embodiment employs an SC (Segment Conductor) winding structure. That is, by inserting a segment conductor called a segment conductor into the slot 23 of the stator core 21 and winding it around the teeth 22, the stator coil 3 is configured.

  Here, with reference to FIG.3 and FIG.4, the stator coil 3 which concerns on this embodiment is demonstrated. FIG. 3 is a view of the stator core 21 and the stator coil 3 as viewed from the inside in the radial direction, and FIG. 4 is a perspective view showing the collective conducting wire constituting the stator coil 3. In this embodiment, as shown in FIGS. 3 and 4, L-shaped collective conducting wires 6 are used as segment conductors. For example, the stator coil 3 is configured by inserting L-shaped collective conducting wires 6 into the respective slots 23 and joining the tips of different collective conducting wires 6 together. More specifically, the collective conducting wire 6 has an L-shape, and the first straight portion 61 that is one straight portion of the L-shape and the other straight portion of the L-shape. And the second straight part 62. The first straight part 61 is inserted into the slot 23, and the tip of the first straight part 61 protrudes from the slot 23. The second linear portion 62 is arranged at the coil end so as to extend over a predetermined number of slots 23 in the circumferential direction of the stator core 21. Then, by joining a plurality of collective conducting wires 6, the stator coil 3 is arranged in a wave winding shape so as to be alternately passed from one side to the other side in the axial direction of the stator core 21 (vertical direction in FIG. 3). To do. For example, when focusing on two collective conducting wires 6 that are adjacent to each other in the circumferential direction, one collective conducting wire 6 is arranged so that the second straight portion 62 is arranged on one side of the stator core 21 in the axial direction, and the axial direction of the stator core 21 is arranged. The other assembly conducting wire 6 is arranged so that the second straight part 62 is arranged on the other side. In this way, the plurality of collective conductors 6 are arranged so that the second straight portions 62 are alternately arranged on one side and the other side. In the two collective conducting wires 6 adjacent to each other in the circumferential direction, the tip end portion (protruding tip portion) of the first straight portion 61 inserted into the slot 23 in one collective lead wire 6 and the circumferential direction in the other collective lead wire 6 Are joined to each other by welding (two joining conductors 6 are joined to each other at the joining portion 65). Thereby, the distributed winding type stator coil 3 formed in a wave winding shape is formed.

  The collective conducting wire 6 is formed by integrating a plurality of conductor strands. As shown in FIG. 5, which is a cross-sectional view taken along the line AA of FIG. 4, the collective conducting wire 6 is configured by stacking, for example, two conductor strands 63. The conductor wire 63 is a conductor plate having an L shape, for example. The two conductor plates (two conductor strands 63) are coupled to each other via an insulating coating layer 64 and a binding layer (not shown), whereby the assembly conductor 6 is formed.

  As the insulating covering layer 64, for example, an oxide film formed by oxidizing the surface of the conductor wire 63, an oxide insulating film attached to the surface of the conductor wire 63, or the like is used. The conductor wires 63 covered by the covering layer 64 are coupled to each other via a binding layer (not shown). As the binding layer, for example, a resin as a fusing material, a resin as an adhesive, or the like is used. As the fusing material, for example, a resin having heat fusibility such as polyvinyl butyral, polyamide, or epoxy, or a resin having alcohol fusibility such as polyamide that is knitted to be soluble in alcohol is used. As the adhesive, for example, EVA, acrylic, urethane, or silicone resin is used. Note that the covering layer 64 and the binder layer are not limited to the above example, and other materials may be used.

  The cross-sectional shape of the conductor wire 63 may be a rectangular shape (rectangle or square), or a substantially rectangular shape with rounded corners. Moreover, the conductor strand 63 is comprised with the material which has electroconductivity, such as copper, aluminum, silver, iron, gold | metal | money, or those alloys, for example.

  In the example shown in FIG. 5, the collective conducting wire 6 is composed of two conductor strands 63, but the collective conducting wire 6 may be composed of three or more conductor strands 63. Here, FIG. 6 shows another example of the collective conducting wire. 6A and 6B are cross-sectional views taken along line AA in FIG. As shown in FIG. 6A, for example, the collective conducting wire 6 may be configured by five conductor strands 63. Each of the five conductor strands 63 is a conductor plate having an L-shape, and the collective conductor 6 is formed by laminating these five conductor strands 63. Further, among the five conductor wires 63, the specific resistance (electrical resistivity) of the two conductor strands 63 arranged on the outside is higher than the specific resistance of the other three conductor strands 63 arranged on the inside. Larger is preferred. Since a circulating current is likely to be generated in the conductor wire 63 arranged outside among the plurality of conductor wires 63, the specific resistance of the conductor wire 63 arranged outside is set to the conductor wire 63 arranged inside. By making it larger than the specific resistance, it is possible to effectively suppress the generation of the circulating current and to effectively reduce the loss due to the circulating current.

  Further, as shown in FIG. 6B, four conductor strands 63 having an L-shape are formed in the width direction (left-right direction in FIG. 6) and the thickness direction (up-down direction in FIG. 6) ( The collective conducting wire 6 may be configured by being arranged in a state of (2 rows × 2 columns).

  As described above, the L-shaped collective conducting wire 6 is inserted into the slot 23 and joined to the other collective conducting wire 6 at the tip, so that the wave-like stator coil 3 is formed and disposed on the stator core 21. The Thus, by using the L-shaped collective conducting wire 6, the wave-wrapped stator coil 3 can be easily arranged on the stator core 21. For example, when a single conducting wire is wave-wound and inserted into the slot 23, a wave-shaped stator coil is manufactured by bending the tip of a U-shaped segment conductor and joining it to another segment conductor. As compared with the case where the stator coil 21 is arranged, the wave-shaped stator coil 3 can be easily arranged on the stator core 21 by using the L-shaped collective conducting wire 6 according to the present embodiment. For example, the wave-like stator coil 3 is formed by joining the other collective conducting wire 6 at the tip without bending the tip of the L-shaped collective conducting wire 6, so that the U-shaped segment conductor is formed. It is possible to manufacture the stator coil 3 and arrange it on the stator core 21 more easily than using.

  Further, by using the L-shaped collective conducting wire 6, the wave-wrapped stator coil 3 can be disposed on the stator core 21 without excessively increasing the length of the stator coil 3. It is possible to suppress an increase in length. That is, the length of the conductive wire used for the stator coil 3 can be reduced to the minimum necessary length, and thereby an increase in the resistance of the stator coil 3 can be suppressed. Can be suppressed.

  In addition, the eddy current loss can be reduced by configuring the collective conducting wire 6 with the plurality of conductor wires 63.

  Further, even when the wave-like stator coil 3 is formed using the segment conductor, a path for suppressing the circulating current is secured by using the L-shaped collective conducting wire 6, so that the circulating current loss is reduced. It becomes possible to reduce. In other words, the circulating current circulates between both end portions of the collective conducting wire 6 (joint portions 65 at both end portions), but the collective conducting wire 6 has an L-shape, and accordingly, the circulating current is correspondingly increased. The path through which the current flows becomes longer, which makes it possible to suppress the circulating current and reduce the circulating current loss.

  For example, the L-shaped collective conducting wire 6 is compared with a case where a wave-like stator coil is formed by using a segment conductor having an I-shape (bar-shaped shape) or a segment conductor having a U-shape. In, the ratio of the length of the path through which the circulating current flows (the length of the single assembly conducting wire 6) to the magnitude of the circulating current generated between both tip portions (both joint portions) increases. Therefore, by using the L-shaped collective conducting wire 6, the circulating current loss can be reduced as compared with other segment conductors.

  Here, with reference to FIG. 7 to FIG. 11, the circulating currents flowing through the L-shaped collective conductor 6, the I-shaped segment conductor, and the U-shaped segment conductor will be described. First, a stator coil according to Comparative Example 1 will be described with reference to FIG. The stator coil 100 according to the comparative example 1 is a wave winding coil configured by I-shaped (rod-shaped) segment conductors 110 and 120. Specifically, the stator coil 100 includes an I-shaped (rod-shaped) segment conductor 110 inserted into the slot 23 of the stator core 21 and projecting from the slot 23 at both ends, and a segment extending in the circumferential direction at the coil end. The segment conductor 120 connects the conductors 110 to each other. For example, an I-shaped segment conductor 110 is inserted into the slot 23 every predetermined number of slots 23, and alternately on one side and the other side in the axial direction (vertical direction in FIG. 7) of the stator core 21 by the segment conductor 120. The I-shaped segment conductors 110 are connected to each other (the end portions of the segment conductors 110 and 120 are joined at the joining portion 130). Thereby, the distributed winding type stator coil 100 formed in a wave winding shape is formed.

  Next, a stator coil according to Comparative Example 2 will be described with reference to FIG. The stator coil 200 according to the comparative example 2 is a wave winding coil configured by a combination of a U-shaped segment conductor 210 and an I-shaped segment conductor 240. The U-shaped segment coil 210 includes two straight portions 220 and a connecting portion 230 that connects the two straight portions 220. Then, the two straight portions 220 are inserted into the slots 23 of the stator core 21, and the protruding tip portions of the different segment conductors 210 are joined to each other by the I-shaped segment conductor 240 extending in the circumferential direction (to the joining portion 250). The U-shaped segment conductor 210 and the I-shaped segment conductor 240 are joined together). Thereby, the distributed winding type stator coil 200 formed in a wave winding shape is formed.

  Next, a stator coil according to Comparative Example 3 will be described with reference to FIG. The stator coil 300 according to the comparative example 3 is a wave winding coil configured by a U-shaped segment conductor 310. The U-shaped segment conductor 310 includes two straight portions 320 and a connection portion 330 that connects the two straight portions 320. Then, the two straight portions 320 are inserted into the slots 23 of the stator core 21, the tip portions protruding from the slots 23 are bent in the circumferential direction, and the tip portions of the segment conductors 310 are joined (different segment conductors 310 at the joint portion 340). Join the tip of each other). For example, the tip portions of different segment conductors 310 are joined at the upper coil end (upper side in FIG. 9). Thereby, the distributed winding type stator coil 300 formed in a wave winding shape is formed.

  Next, with reference to FIG. 10, the circulating current which generate | occur | produces in each of the assembly conductor 6 which concerns on this embodiment, and the segment conductor which concerns on Comparative Examples 1-3 and the path | route through which circulating current flows are demonstrated. 10 (a) shows the assembly conductor 6, FIG. 10 (b) shows the segment conductor 110 according to Comparative Example 1, FIG. 10 (c) shows the segment conductor 210 according to Comparative Example 2, and FIG. ) Shows a segment conductor 310 according to Comparative Example 3. The magnitude of the circulating current depends on the magnitude of the magnetic flux interlinking with the conducting wire inserted in the slot 23. In addition, the circulating current flows between the two end portions of each of the L-shaped collective conductor 6, the I-shaped segment conductor 110, the U-shaped segment conductor 210, and the U-shaped segment conductor 310 (two joint portions). In between).

Here, the length of the path of the circulating current flows to the length L _A in L-shaped assembly conducting wire 6, and the length of the path which the circulating current flows to the length L _B in the I-shaped conductor segment 110, U the length of the path of the circulating current flows to the length L _C in-shaped conductor segment 210, when the length of the path which the circulating current flows to the length L _D in U-shaped conductor segment 310, the length L _a , L _B , L _C , and L _D are L _A : L _B : L _C : L _D = 2: 1: 3: 4. This point will be described in detail. In the L-shaped collective conducting wire 6, the circulating current circulates between the tip portion (joint portion 65) of the first straight portion 61 and the tip portion (joint portion 65) of the second straight portion 62. That is, in the L-shaped collective conducting wire 6, since the circulating current flows through the first straight portion 61 and the second straight portion 62, the length L _{A of the} path through which the circulating current flows is equal to two conducting wires (first straight line). This corresponds to the length of the part 61 and the second straight part 62). On the other hand, in the I-shaped segment conductor 110, the circulating current circulates between both end portions (both joint portions 130) of the segment conductor 110. That is, in the I-shaped conductor segment 110, because the circulating current flowing through the I-shaped conductor segment 110, the length L _B of the path for circulating current flows, one roll of wire (I-shaped conductor segments 110). In addition, in the U-shaped segment conductor 210, the circulating current flows through the connecting portion 230 between the tip portion (joint portion 250) of one straight portion 220 and the tip portion (joint portion 250) of the other straight portion 220. Through. That is, in the U-shaped conductor segments 210, since the two linear portions 220 and the connecting portion 230 flows circulating current, the length L _C of the paths circulating current flows, 3 duty conductors (two straight portions 220 And the length of the connecting portion 230). Further, in the U-shaped segment conductor 310, the circulating current is generated between the bent tip portion (joint portion 340) of one straight portion 320 and the bent tip portion (joint portion 340) of the other straight portion 320. Reflux via connection 330. That is, in the U-shaped segment conductor 310, a portion inserted into the slot 23 of the two straight portions 320, a bent portion of the two straight portions 320 (corresponding to the length of one conductor), Since the circulating current flows through the connection portion 330, the length L _{D of the} path through which the circulating current flows corresponds to the length of the four conductors. Accordingly, the ratios of the lengths L _A , L _B , L _C , and L _D through which the circulating current flows are L _A : L _B : L _C : L _D = 2: 1: 3: 4. Accordingly, when the resistance of one conductor is R, the ratio of the path lengths L _A , L _B , L _C , and L _D is L _A : L _B : L _C : L _D = 2: 1: 3. : 4, so the resistance of the L-shaped assembly conductor 6: resistance of the I-shaped segment conductor 110: resistance of the U-shaped segment conductor 210: resistance of the U-shaped segment conductor 310 = 2R: R: 3R: 4R.

Further, the circulating current generated in the L-shaped assembly conducting wire 6 and the circulating current I _A, the circulating current generated in the I-shaped conductor segments 110 and the circulating current I _B, which occurs in the U-shaped conductor segments 210 the circulating current and the circulating current _{I C,} when the circulating current generated in the U-shaped conductor segments 310 and the circulating current _{I D,} the circulating current _{I a, I B, I C} , the ratio of the magnitude of _{I D} is, I _A : I _B : I _C : I _D = 3: 6: 4: 3. This point will be described in detail. In the L-shaped collective conducting wire 6, the first straight portion 61 is inserted into the slot 23, and in the stator coil 100 according to Comparative Example 1, the I-shaped segment conductor 110 is inserted into the slot 23. In the U-shaped segment conductor 210 according to Example 2, two straight portions 220 are inserted into the slots 23, and in the U-shaped segment conductor 310 according to Comparative Example 3, two straight portions 320 are inserted into the slots 23. Has been inserted. Thus, in the L-shaped collective conducting wire 6, one conducting wire (first linear portion 61) is inserted into the slot 23, and in the stator coil 100 according to the comparative example 1, one conducting wire ( The I-shaped segment conductor 110) is inserted into the slot 23. In the U-shaped segment conductor 210 according to the comparative example 2, two conductors (two straight portions 220) are inserted into the slot 23. In the U-shaped segment conductor 310 according to the comparative example 3, two conductors (two straight portions 320) are inserted into the slot 23. The magnitude of the circulating current depends on the magnitude of the magnetic flux B interlinked with the conducting wire inserted in the slot 23, and the magnetic flux interlinked with the segment conductor having a larger number of conducting wires inserted in the slot 23 becomes larger. Here, when the induced voltage by the magnetic flux B is a voltage E, in the L-shaped collective conductor 6 and the I-shaped segment conductor 110, one conductor is inserted in the slot 23, and the U-shaped segment conductor In 210 and 310, two conductors are inserted into the slot 23, so that an induced voltage generated in the L-shaped collective conductor 6: an induced voltage generated in the I-shaped segment conductor 110: a U-shaped segment conductor 210 Induced voltage: induced voltage generated in the U-shaped segment conductor 310 = E: E: 2E: 2E. Further, as described above, the resistance of the L-shaped collective conducting wire 6: the resistance of the I-shaped segment conductor 110: the resistance of the U-shaped segment conductor 210: the resistance of the U-shaped segment conductor 310 = 2R: R : 3R: 4R, the ratio of the magnitudes of the circulating currents I _A , I _B , I _C , I _D is as follows: I _A : I _B : I _C : I _D = (E / 2R) :( E / R ) :( 2E / 3R) :( 2E / 4R) = 3: 6: 4: 3.

  Next, with reference to FIG. 11, the loss by the circulating current in each of the assembly conductor 6 according to the present embodiment and the segment conductors according to Comparative Examples 1 to 3 will be described. FIG. 11 schematically shows the assembly conductor 6 and the segment conductors according to Comparative Examples 1 to 3. FIG. 11A shows a combination of L-shaped collective conductors 6, FIG. 11B shows a combination of I-shaped segment conductors 110 and 120 according to Comparative Example 1, and a comparison with FIG. 11C. A combination of a U-shaped segment conductor 210 and an I-shaped segment conductor 240 according to Example 2 is shown, and a U-shaped segment conductor 310 according to Comparative Example 3 is shown in FIG. Here, considering the collective conductor 6 and the conductors having the same length for each of the segment conductors according to Comparative Examples 1 to 3, the length of the combination of the two L-shaped collective conductors 6 and the four I-shaped segments Length of combination of conductors 110 and 120 (length of combination of two vertical segment conductors 110 and two horizontal segment conductors 120), one U-shaped segment conductor 210 and one I-shape The length of the combination with the segment conductor 240 and the length of one U-shaped segment conductor 310 are equal. And the loss by the circulating current in each conducting wire with equal length is as follows.

(Gathering conductor 6 according to this embodiment)
In the combination of two L-shaped collective conductors 6, a circulating current flows through each collective conductor 6, so the loss in the combination of the two L-shaped collective conductors 6 is 2 × 2R × (E / 2R) ^2. = the ^E 2 / R.

(I-shaped segment conductors 110 and 120 according to Comparative Example 1)
In the combination of the four I-shaped segment conductors 110 and 120, a circulating current flows through the two vertical segment conductors 110. Therefore, the loss in the combination of the four I-shaped segment conductors 110 and 120 is 2 ×. R × (E / R) ² = 2E ² / R.

(U-shaped segment conductor 210 and I-shaped segment conductor 240 according to Comparative Example 2)
In the combination of the U-shaped segment conductor 210 and the I-shaped segment conductor 240, since a circulating current flows through the U-shaped segment conductor 210, the loss in the combination of the segment conductors 210 and 240 is 3R × (2E / 3R) ² = 4E ² / 3R.

(U-shaped segment conductor 310 according to Comparative Example 3)
In the U-shaped segment conductor 310, since a circulating current flows through the segment conductor 310, the loss is 4R × (2E / 4R) ² = E ² / R.

Therefore, loss in the combination of the L-shaped collective conductor 6: loss in the combination of the I-shaped segment conductors 110 and 120: loss in the combination of the U-shaped segment conductor 210 and the I-shaped segment conductor 240: U Loss in the letter-shaped segment conductor 310 = E ² / R: 2E ² / R: 4E ² / 3R: E ² / R = 3: 6: 4: 3.

  As described above, compared to Comparative Examples 1 and 2, the L-shaped collective conductor 6 has a smaller loss due to the circulating current. Therefore, by using the L-shaped collective conducting wire 6, the circulating current is further suppressed and the loss due to the circulating current is reduced as compared with the case where the I-shaped segment conductors 110 and 120 and the U-shaped segment conductor 210 are used. This can be further reduced.

  The loss of Comparative Example 3 using the U-shaped segment conductor 310 is the same as the loss of the present embodiment using the L-shaped collective conducting wire 6, but the stator coil 300 according to Comparative Example 3 has the same loss. There are the following problems. In Comparative Example 3, since the straight portion 320 of the U-shaped segment conductor 310 is inserted into the slot 23 and then the tip portion needs to be bent and connected, the laminated steel plate is processed as in this embodiment. Cannot be configured. Moreover, in the comparative example 3, since a coil swells in a connection part, there exists a problem that a lead wire becomes long and resistance increases. On the other hand, according to the collective conducting wire 6 according to the present embodiment, it is possible to suppress an increase in the length of the stator coil 3 and to reduce eddy current loss by constituting the laminated steel plate. .

  The effects of the collective conducting wire 6 according to the present embodiment are summarized as follows. By joining the L-shaped collective conducting wires 6 to each other, it is possible to easily dispose the stator coil 3 on the stator core 21 while suppressing an increase in the length of the stator coil 3. Moreover, since the assembly conducting wire 6 is composed of a plurality of conductor strands 63, it is possible to reduce eddy current loss as compared with a stator coil in which the conducting wires are not divided. Further, according to the L-shaped collective conducting wire 6, the circulating current can be further suppressed and the circulating current loss can be further reduced as compared with the case where the I-shaped or U-shaped segment conductor is used.

  DESCRIPTION OF SYMBOLS 1 Rotating electric machine, 2 Stator, 3 Stator coil, 4 Rotor, 5 Shaft, 6 Collecting conducting wire, 21 Stator core, 22 Teeth, 23 Slot, 41 Rotor core, 42 Permanent magnet, 61 1st linear part, 62 2nd linear part, 63 Conductor strands, 64 coating layers, 65 joints.

Claims (2)

An annular stator core having a plurality of teeth extending radially inward and having slots provided between adjacent teeth;
A stator coil ing of a plurality of sets conductors plurality of conductors wires are arranged along the circumferential direction of the stator core has an L-shape integrally,
I have a,
In the collective conducting wire, one straight portion of the L-shaped shape is disposed in a state of being inserted into a slot of the stator core, and the other straight portion of the L-shaped shape is the stator core. It is arranged to extend in the circumferential direction of
In a different collective conducting wire, the tip of the one straight portion of one collective conducting wire and the tip of the other straight portion of the other collective conducting wire are joined,
The collective conducting wire is a laminated body in which a plurality of conductor plates having an L-shape are laminated, and as the laminated conductor plates, two outer conductor plates and one or a plurality of inner conductor plates Including
The two outer conductor plates and the one or more inner conductor plates are laminated,
The one or more inner conductor plates are arranged between one outer conductor plate and the other outer conductor plate of the two outer conductor plates in the stacking direction,
The specific resistance of the two outer conductor plates is greater than the specific resistance of the one or more inner conductor plates.
Rotating electric machine characterized by that. The rotating electrical machine according to claim 1 ,
The stator coil constitutes a wave-like distributed winding coil,
Rotating electric machine characterized by that.

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