JP7283265B2 - Rotating electric machine - Google Patents

Description

The present invention relates to rotating electric machines.

2. Description of the Related Art As a countermeasure against heat generated by a stator when a rotating electric machine is driven, for example, a fin-shaped heat radiating portion is provided on the outer peripheral surface of a housing in which the stator is inscribed (see, for example, Patent Document 1).

JP 2019-22250 A

Functional parts such as a mounting part are often provided on the outer peripheral surface of the housing in addition to the heat radiating part. That is, the portion where the functional portion is located, such as the mounting portion having the mounting hole, tends to have higher thermal resistance and lower heat dissipation performance than other portions without the functional portion. In other words, since the heat resistance is not uniform in the circumferential direction of the housing, there is a problem that the cooling of the stator may differ depending on the setting of the circumferential position of the stator with respect to the housing.

SUMMARY OF THE INVENTION An object of the present invention is to provide a rotating electric machine capable of efficiently cooling a stator.

A rotary electric machine that solves the above problems includes a three-phase coil (22) in which a conductor (22x) is wound around teeth (21b) of a stator core (21), and a three-phase drive current to the three-phase coil and a housing (30) in which the stator is inscribed and fixed, wherein the stator is is configured such that the amount of heat generated by the conducting wire is not uniform in the circumferential direction, and the housing has a configuration in which the thermal resistance is not uniform in the circumferential direction. The relative positions of the stator and the housing in the circumferential direction are set such that the large areas (B1, B2) are the low heat resistance areas (A0) of the housing.

According to the above configuration, in a rotary electric machine in which a stator whose heat generation amount is not uniform in the circumferential direction and a housing whose thermal resistance is not uniform in the circumferential direction are combined, a region of the stator where the heat generation amount is large is the heat resistance of the housing. The relative circumferential positions of the stator and the housing are set so as to provide a low area. As a result, heat is efficiently conducted from the stator to the housing, enabling efficient cooling of the stator.

1 is a schematic configuration diagram of a rotary electric machine in one embodiment; FIG. (a) is an explanatory diagram of a winding mode of the coil of the stator, and (b) is a wiring diagram of the coil. Explanatory drawing of the winding aspect of the U-phase coil of a stator. FIG. 4 is an explanatory diagram of a winding mode of a V-phase coil of a stator; FIG. 4 is an explanatory diagram of a winding mode of a W-phase coil of a stator; FIG. 4 is a schematic diagram for explaining how the stator and the housing are assembled; The schematic diagram for demonstrating the assembly|attachment aspect of the stator and housing in a modification.

An embodiment of a rotating electrical machine will be described below.
As shown in FIG. 1, the rotary electric machine 10 of this embodiment is configured by a brushless motor that is driven to rotate based on the supply of a three-phase drive current. The rotary electric machine 10 accommodates various components including a stator 11 and a rotor 12 in an internal space of a housing 30 . The stator 11 has an annular shape and is fixed in contact with the cylindrical portion of the housing 30 , and the rotor 12 is rotatably disposed radially inside the stator 11 . In the rotary electric machine 10 of this embodiment, the stator 11 is set to have 96 magnetic poles, and the rotor 12 is set to have 32 magnetic poles.

The stator 11 includes a magnetic metal stator core 21 and a coil 22 wound around the stator core 21 . The stator core 21 has an annular portion 21a and a plurality of teeth 21b extending radially inward from the inner peripheral edge of the annular portion 21a. Ninety-six teeth 21b are provided at regular intervals in the circumferential direction. A space between the adjacent teeth 21b functions as a slot 21c for accommodating the conductor 22x of the coil 22 wound around the teeth 21b. Ninety-six slots 21c are provided, like the teeth 21b. A rectangular wire having a rectangular cross section is used for the conducting wire 22x of the present embodiment. The slot 21c has a width of one lead wire 22x made of a rectangular wire.

The coil 22 is wound across the three teeth 21b by wave winding, which is one of distributed winding. The coil 22 is composed of three-phase coils of U-phase, V-phase and W-phase corresponding to the supply of the three-phase drive current. Further, the coils 22 are connected in parallel in two phases of U-phase, V-phase and W-phase. It includes a second coil 22v2, a W-phase first coil 22w1, and a W-phase second coil 22w2. The stator 11 of this embodiment has 32 poles in one phase, which is the same as the number of magnetic poles of the rotor 12, which is a so-called single slot structure. The stator 11 adopting the single slot structure is advantageous in reducing the weight of the coil 22 portion. A specific winding mode of the coil 22 of the present embodiment is as follows.

2(a), the 96 slots 21c of the stator 11 are assigned slot numbers "1" to "96", and The winding start position of the second coils 22u1 and 22u2 is assumed to be slot number "1".

[U-phase first and second coils 22u1 and 22u2]
As shown in FIGS. 2(a) and 3, in the U-phase first coil 22u1, the slot number "1" at the winding start position is "1", "4", "7", . While the lead wire 22x is inserted into the slot 21c in this order, the wave winding on the forward side is performed, and the slot number "49" is set to the folded portion 22ua, and "49" . . . Wave winding on the return path is performed every three slots in the reverse order of the forward path. Again, as the second reciprocating wave winding, slot number "1" is used as the folded portion 22ub, and wave winding on the forward side is performed as "1", "4", "7", ..., "49", and slot number "49" is performed. As the folded portion 22ua, wave winding on the return path side is performed as "49" . . . "7""4""1". Furthermore, as the third reciprocation of wave winding, one reciprocation of wave winding similar to the second reciprocation is performed. By performing wave winding three times, six conductor wires 22x are arranged in a line in the radial direction in each slot 21c. In the U-phase first coil 22u1, slot number "4" is the winding end position. The conductor wire 22x that has returned to the slot number “4” does not go to the slot number “1” and is led out with the slot number “4” as the winding end position, and is connected to the neutral point member 23 .

In the U-phase second coil 22u2, as in the U-phase first coil 22u1, the winding start position of the conductor wire 22x is from the slot number "1" as described above. Further, when the wave winding forward side of the U-phase first coil 22u1 is the counterclockwise direction of the stator 11, the wave winding forward side of the U-phase second coil 22u2 is opposite to the wave winding direction of the U-phase first coil 22u1. clockwise direction.

That is, in the U-phase second coil 22u2, the lead wires 22x are inserted into the slots 21c in the order of "1", "94", "91", . Winding is performed, with the slot number "49" being the turn-back portion 22ua, "49" . done. Again, as the second reciprocating wave winding, slot number "1" is used as the folded portion 22ub, and forward wave winding is performed as "1", "94", "91", ..., "49". As the folded portion 22ua, wave winding on the return path side is performed as "49" . . . "91" "94" "1". Furthermore, as the third reciprocation of wave winding, one reciprocation of wave winding similar to the second reciprocation is performed. In the U-phase second coil 22u2, slot number "94" is the winding end position. The conductor wire 22x that has returned to the slot number “94” is led out and connected to the neutral point member 23 with the slot number “94” as the winding end position without going to the slot number “1”.

That is, in the present embodiment, the U-phase first and second coils 22u1 and 22u2 that are in-phase and parallel-connected are connected to a straight line passing through the slot numbers "1" and "49" located opposite each other by 180°, in this case the stator 11. The first coil 22u1 is provided in a counterclockwise half circumference winding range, and the second coil 22u2 is provided in a clockwise half circumference winding range with respect to a straight line L1 that also passes through the center point O1. . The U-phase first and second coils 22u1 and 22u2 are arranged in a symmetrical winding manner with a straight line L1 passing through the slot numbers "1" and "49" as an axis of symmetry.

Further, the slot numbers "1" and "49" located on the straight line L1, which is the axis of symmetry, are the wave-wound folded portions 22ub and 22ua of the U-phase first and second coils 22u1 and 22u2. Three conductors 22x of the second coils 22u1 and 22u2 are mixed in the slots 21c with the slot numbers "1" and "49", respectively. The conductor wire 22x in the slot 21c is arranged from the radially outer side to the inner side in the slot 21c during the winding process. Then, the conductors 22x on the side of the second coil 22u2 are arranged alternately, and the conductors 22x on the side of the second coil 22u2 are positioned radially inward. On the other hand, in the slot number "49", the conductor 22x on the side of the second coil 22u2 is positioned radially outermost, followed by the conductor 22x on the side of the first coil 22u1. A conductor 22x on the side of the first coil 22u1 is located. For the folded portions 22ub and 22ua with slot numbers "1" and "49", the arrangement of the conductors 22x of the first and second coils 22u1 and 22u2 is reversed.

In addition, in each of the folded portions 22ub and 22ua with the slot numbers "1" and "49", the conductors 22x of the U-phase first and second coils 22u1 and 22u2 are alternately arranged one by one, and the slot numbers "1" and "49" are arranged. In order to reverse the arrangement in , for example, the conductor 22x of the first and second coils 22u1 and 22u2 is wound as follows.

In the slot number "1", first, the conductor 22x on the side of the first coil 22u1 is inserted, and the conductor 22x on the side of the first coil 22u1 is arranged radially outward in the slot 21c. Next, the first coil 22u1 goes through the first round trip of the wave winding, and the winding of the first coil 22u1 is waited just before the slot number "49". Next, in slot number "1", the conductor 22x on the side of the second coil 22u2 is inserted, and the conductor 22x on the side of the second coil 22u2 is arranged second from the radially outer side in the slot 21c. Next, the forward winding of the first round trip of the wave winding on the side of the second coil 22u2 is performed as it is, and it is turned back at the slot number "49". At this time, in the slot number "49", the conducting wire 22x on the side of the second coil 22u2 becomes the radially outermost arrangement in the slot 21c. In addition, the second coil 22u2 continues the first round trip of the wave winding, and waits for the winding of the second coil 22u2 immediately before the slot number "1".

Next, the winding of the first coil 22u1 that was on standby immediately before the slot number "49" is restarted and turned back at the slot number "49". At this time, in the slot number "49", the conductor 22x on the side of the first coil 22u1 is arranged second from the radially outer side in the slot 21c. Further, the first coil 22u1 side wave-winding inward winding is performed as it is, and is turned back at the slot number "1". At this time, in the slot number "1", the conductor 22x on the side of the first coil 22u1 is arranged third from the radially outer side in the slot 21c. Further, the first coil 22u1 continues to perform the second forward winding of the wave winding, and waits for the winding of the first coil 22u1 immediately before the slot number "49".

Next, the winding of the second coil 22u2 that was on standby just before the slot number "1" is restarted and turned back at the slot number "1". At this time, in the slot number "1", the conductor 22x on the side of the second coil 22u2 is arranged fourth from the radially outer side in the slot 21c. Further, the forward winding of the second round trip of the wave winding on the side of the second coil 22u2 is performed as it is, and it is turned back at the slot number "49". At this time, in the slot number "49", the conductor 22x on the side of the second coil 22u2 is arranged third from the radially outer side in the slot 21c. In addition, the second coil 22u2 side of the wave winding returns to the second reciprocation, and waits for the winding of the second coil 22u2 immediately before the slot number "1".

By repeating such winding, the conductor wires 22x of the U-phase first and second coils 22u1 and 22u2 are alternately arranged one by one in each of the folded portions 22ub and 22ua of the slot numbers "1" and "49". , and slot numbers "1" and "49" are configured to be reversed.

[Regarding V-phase first and second coils 22v1 and 22v2]
As shown in FIGS. 2A and 4, the V-phase first and second coils 22v1 and 22v2 are wound in the same manner as the U-phase first and second coils 22u1 and 22u2 except that the slot numbers are different. It is the same as the winding mode. Description will be omitted as appropriate below.

In the V-phase first coil 22v1, the conductor 22x is inserted from the slot number "3" at the winding start position, and is rotated counterclockwise in the order of "3", "6", "9", ..., "51" every three slots. Forward side wave winding is performed toward the slot number "51", and return side wave winding is performed in the reverse order of the forward path as "51" . . . "9" "6" "3". Similarly, the wave winding of the V-phase first coil 22v1 is repeated three times between the forward side folded portion 22va and the homeward side folded portion 22vb, and the lead wire 22x is led out with the slot number "6" as the winding end position. , is connected to the neutral point member 23 .

In the V-phase second coil 22v2, the conducting wire 22x is inserted from the slot number "3" in the same way as the V-phase first coil 22v1, and V is arranged in the order of "3", "96", "93", ..., "51" every three slots. Wave winding on the forward side is performed in the clockwise direction opposite to that of the first phase coil 22v1, and the slot number "51" is set to the folded portion 22va to form "51" . . . "93" "96" "3". Wave winding is performed on the return path in the reverse order of the forward path. Similarly, the wave winding of the V-phase second coil 22v2 is carried out three times between the outward-side folded portion 22va and the return-side folded portion 22vb, and the lead wire 22x is led out with the slot number "96" as the winding end position. , is connected to the neutral point member 23 .

That is, for the V-phase first and second coils 22v1 and 22v2 as well, the straight line L2 passing through the slot numbers "3" and "51" located opposite each other by 180° and also passing through the center point O1 of the stator 11 is The coil 22v1 is provided in a counterclockwise half-circle winding range, and the second coil 22v2 is provided in a clockwise half-circle winding range. The V-phase first and second coils 22v1 and 22v2 are arranged in a symmetrical winding manner with a straight line L2 passing through slot numbers "3" and "51" as an axis of symmetry.

In each of the wave-wound folded portions 22vb and 22va with slot numbers "3" and "51", the conductors 22x of the V-phase first and second coils 22v1 and 22v2 are alternately arranged one by one and slot number "3" is arranged. It is configured in the same manner as the U phase so that the arrangement is reversed at "51".

[Regarding W-phase first and second coils 22w1 and 22w2]
As shown in FIGS. 2A and 5, the winding modes of the W-phase first and second coils 22w1 and 22w2 are also different from the U-phase first and second coils 22u1 and 22u2 and the V-phase first and second coils 22u1 and 22u2. This is approximately the same as the winding mode of the coils 22v1 and 22v2. However, the W-phase first and second coils 22w1 and 22w2 have some differences other than the slot numbers. The winding start positions of the U-phase first and second coils 22u1 and 22u2 are both slot number "1", and the winding start positions of the V-phase first and second coils 22v1 and 22v2 are both slot number "3". The winding start positions of the W-phase first and second coils 22w1 and 22w2 are different from slot numbers "5" and "95", respectively. On the other hand, the winding end positions of the U-phase first and second coils 22u1 and 22u2 are respectively slot numbers "4" and "94", and the winding end positions of the V-phase first and second coils 22v1 and 22v2 are respectively slot number "6". ' and '96', the winding end positions of the W-phase first and second coils 22w1 and 22w2 are both slot number '2'. In addition to these, the description will be omitted as appropriate below.

In the W-phase first coil 22w1, the conductor 22x is inserted from the slot number "5" at the winding start position, and is rotated counterclockwise in the order of "5", "8", "11", ..., "50" every three slots. Forward side wave winding is performed toward slot number "50" as the folded portion 22wa, "50" . is done. Similarly, the wave winding of the W-phase first coil 22w1 is repeated three times between the outward-side folded portion 22wa and the return-side folded portion 22wb, and the lead wire 22x is led out with the slot number "2" as the winding end position. , is connected to the neutral point member 23 .

In the W-phase second coil 22w2, the lead wire 22x is inserted from the slot number "95" whose winding start position is different from that of the W-phase first coil 22w1. , in the clockwise direction opposite to that of the W-phase first coil 22w1. , and further wave winding is performed on the backward side in the reverse order of the outward path up to slot number "2". Similarly, the wave winding of the W-phase second coil 22w2 is also performed three times between the outward-side folded portion 22wa and the return-side folded portion 22wb, and the lead wire 22x has the same slot number as the W-phase first coil 22w1. is derived as the winding end position and connected to the neutral point member 23 .

That is, for the W-phase first and second coils 22w1 and 22w2 as well, the straight line L3 passing through the slot numbers "2" and "50" located opposite each other by 180° and passing through the center point O1 of the stator 11 is The coil 22w1 is provided in a counterclockwise half-circle winding range, and the second coil 22w2 is provided in a clockwise half-circle winding range. The W-phase first and second coils 22w1 and 22w2 are wound symmetrically with respect to a line L3 passing through the slot numbers "2" and "50".

In each of the wave-wound folded portions 22wb and 22wa with slot numbers "2" and "50", the conductors 22x of the W-phase first and second coils 22w1 and 22w2 are alternately arranged one by one and slot number "2" is arranged. It is configured in the same manner as the above U phase and V phase so that the arrangement is reversed at "50".

Thus, U-phase first and second coils 22u1 and 22u2, V-phase first and second coils 22v1 and 22v2, and W-phase first and second coils 22w1 and 22w2 are wound around the stator core 21 . The lead wire 22x at one end of the U-phase first and second coils 22u1 and 22u2 extending from the U-phase winding start position slot number "1" is connected to the U-phase power supply terminal 24u, and is connected to the V-phase winding start position slot number "1". A conductor 22x at one end of the V-phase first and second coils 22v1 and 22v2 extending from "3" is connected to a V-phase power supply terminal 24v. Lead wires 22x at one ends of W-phase first and second coils 22w1 and 22w2 extending from slot numbers "5" and "95" at W-phase winding start positions are connected together to W-phase power supply terminal 24w. As described above, the conductor 22x at the other end of the U-phase first and second coils 22u1 and 22u2 extending from slot numbers "4" and "94" at the U-phase winding end position is connected to the neutral point member 23, The conductors 22x at the other ends of the V-phase first and second coils 22v1 and 22v2 extending from slot numbers "6" and "96" at the V-phase winding end positions are also connected to the neutral point member 23 in the same manner. The conductors 22x at the other ends of the W-phase first and second coils 22w1 and 22w2 extending from the W-phase winding end position slot number "2" are also connected to the neutral point member 23 in the same manner. In other words, the stator 11 of the present embodiment is configured with the 3-phase Y-connection coils 22 that form two parallel connections in the same phase, as shown in FIG. 2(b).

As shown in FIGS. 1 and 6, the housing 30 of this embodiment has 96 radiation fins 31, which are the same as the teeth 21b of the stator 11, on the outer peripheral surface of its own cylindrical portion. The radiation fins 31 are arranged side by side at intervals in the circumferential direction of the outer peripheral surface of the housing 30 . Each radiation fin 31 protrudes radially outward from the outer peripheral surface and has a plate shape along the axial direction. The housing 30 having such radiating fins 31 also has mounting portions 32 at, for example, four locations on the outer peripheral surface. The mounting portions 32 are arranged side by side at intervals in the circumferential direction of the outer peripheral surface of the housing 30 . Each mounting portion 32 is provided at a coarse pitch with respect to each radiation fin 31 . Each mounting portion 32 protrudes radially outward in, for example, a substantially semicircular shape from the outer peripheral surface, and has a predetermined length in the axial direction. Each mounting portion 32 has a circular mounting hole 32a, and is used when screwing together the parts of the housing 30 made up of a plurality of parts, or when the rotary electric machine 10 is attached to a member (not shown) to which it is attached. It is used in cases such as when screwing to the other side.

Further, each mounting portion 32 is provided at the base end portion of, for example, four heat radiation fins 31 . Here, in order to make the outer shape of the rotating electric machine 10 circular, the radially outer end portions, which are the tip portions of the radiation fins 31, are set to be positioned on the same circumference in the entire circumferential direction. Therefore, the radiation fins 31 having the mounting portions 32 at their base ends have a smaller radial length and a smaller surface area than the radiation fins 31 at other locations without the mounting portions 32 . . In other words, the heat radiation performance of the heat radiation fin 31 having the mounting portion 32 at the base end thereof tends to be lower than that of other portions without the mounting portion 32 . In other words, the housing 30 of this embodiment has uneven heat dissipation performance in the circumferential direction.

That is, as shown in FIG. 6, in the circumferential direction of the housing 30, the region where the heat radiation fins 31 having the mounting portions 32 at the base end exist is the region A1 with high thermal resistance. , that is, the area where the void exists is the area A2 with the higher thermal resistance. A high thermal resistance means that the thermal conductivity of the heat transfer path from the stator 11 to the heat radiating fins 31 is low, and the heat radiation performance is low. On the other hand, the area A0 where only the heat radiating fins 31 are present has a lower thermal resistance than the area A1 where the mounting portion 32 is located, meaning that the heat radiation performance is high.

In contrast to the housing 30 having a structure in which the heat resistance is not uniform in the circumferential direction, the amount of heat generated by the stator 11 when the rotating electric machine 10 is driven is also not uniform in the circumferential direction. Specifically, in the stator 11, for example, the vicinity of the U-phase slot number “1” will be described as a representative. When the conducting wire 22x is wave-wound one reciprocating motion, the potential difference between the radially adjacent conducting wire 22x that has made one reciprocating motion at the folded portion 22ub is large. Therefore, on the first coil 22u1 side, the amount of heat generated in the area B1 corresponding to one magnetic pole in the counterclockwise direction from the folded portion 22ub, specifically, three teeth 21b in the counterclockwise direction from the folded portion 22ub is large. Also, on the second coil 22u2 side, the amount of heat generated is large in the region B2 corresponding to one magnetic pole in the clockwise direction from the folded portion 22ub. This also applies to the side of the folded portion 22ua. That is, in the U-phase, the single magnetic pole regions B1 and B2 of the first and second coils 22u1 and 22u2 including the folded portions 22ua and 22ub generate a large amount of heat compared to the other U-phase magnetic poles. .

This applies to all of the folded portions 22ua to 22wb of the U-phase, V-phase and W-phase first and second coils 22u1 to 22w2 shown in FIG. Therefore, in the present embodiment, the one magnetic pole regions B1 and B2 including the folded portions 22ua to 22wb of the coils 22u1 to 22w2 that generate a large amount of heat of the stator 11 are arranged to be the region A0 of the housing 30 that has a low thermal resistance. In other words, the one magnetic pole regions B1 and B2 including the folded portions 22ua to 22wb of the coils 22u1 to 22w2 and the high heat resistance region A1 of the housing 30 are set in a displaced relationship in the circumferential direction. there is

The operation of this embodiment will be described.
When the rotary electric machine 10 is rotationally driven, a three-phase drive current is supplied from a control circuit (not shown) to the coils 22 of the stator 11 through the U-phase, V-phase and W-phase power supply terminals 24u, 24v and 24w. A rotating magnetic field is generated in the stator 11 based on the three-phase drive current supplied to the coil 22 , and the rotor 12 rotates based on the rotating magnetic field generated in the stator 11 .

When the rotary electric machine 10 is driven, in the stator 11, the conducting wire 22x generates heat based on the energization of the U-phase, V-phase and W-phase first and second coils 22u1 to 22w2. The heat of the conducting wire 22x is transmitted from the stator core 21 to the housing 30 and released to the atmosphere through the radiation fins 31, thereby cooling the stator 11. As shown in FIG. Especially in the present embodiment, the one magnetic pole regions B1 and B2 including the folded portions 22ua to 22wb of the coils 22u1 to 22w2 that generate a large amount of heat of the stator 11 are arranged in the region A0 of the housing 30 that has a low thermal resistance. , heat is efficiently conducted from the stator 11 to the radiation fins 31 of the housing 30, and the stator 11 can be efficiently cooled.

Effects of the present embodiment will be described.
(1) The rotary electric machine 10 of the present embodiment is a combination of the stator 11 whose heat generation amount is not uniform in the circumferential direction and the housing 30 whose thermal resistance is not uniform in the circumferential direction. Then, the region of the stator 11 where the amount of heat generated is large, that is, the regions B1 and B2 of one magnetic pole including the folded portions 22ua to 22wb of the U-phase, V-phase and W-phase first and second coils 22u1 to 22w2 are located in the housing 30. The circumferential positions of the stator 11 and the housing 30 are set so as to form a region A0 having only the heat radiation fins 31 without the mounting portions 32, that is, a region A0 having a low thermal resistance. As a result, heat is efficiently conducted from the stator 11 to the housing 30, and efficient cooling of the stator 11 can be achieved.

(2) In the stator 11 of the present embodiment, the first and second coils 22u1 to 22w2 that are in phase and connected in parallel are separated in the circumferential direction of the stator 11 and are equal to each other and , and the boundaries of each half-circumference winding range are configured as reciprocating folded portions 22ua to 22wb of distributed winding. That is, the first and second coils 22u1 to 22w2 which are in phase and connected in parallel can be arranged with their own conductors 22x tightly packed, and can be wound in a similar manner without being biased toward one side in the radial direction. It is possible to suppress bias of the interlinkage magnetic flux to the side coils 22u1 to 22w2. As a result, it is possible to suppress the circulating current that may occur between the in-phase parallel-connected coils 22u1 to 22w2, and thus suppress the loss of the rotating electrical machine 10 with a simple configuration.

(3) In the folded portions 22ua to 22wb, the conductor wires 22x of the first and second coils 22u1 to 22w2 are arranged in a row in the radial direction, and the conductor wires 22x of the first and second coils 22u1 to 22w2 are arranged in a row. The conductors are arranged alternately one by one. As a result, it is possible to further suppress the deviation of the interlinkage magnetic flux that may be caused by the influence of the folded portions 22ua to 22wb. In other words, it is possible to contribute to further suppression of the circulating current that may occur between the parallel-connected coils 22u1 to 22w2 of the same phase.

Also, in the folded portions 22ua to 22wb, the alternate arrangement of the conductors 22x of the first and second coils 22u1 to 22w2 is reversed at the two locations. As a result, the bias of the interlinkage magnetic flux that can be caused by the influence of the folded portions 22ua to 22wb is canceled between the opposite arrangements, so that the bias of the interlinkage magnetic flux can be further suppressed. In other words, it is possible to contribute to further suppression of the circulating current that may occur between the in-phase parallel-connected coils 22u1 to 22w2.

This embodiment can be implemented with the following modifications. This embodiment and the following modified examples can be implemented in combination with each other within a technically consistent range.
- Although the area A1 (A2) of the housing 30 with high thermal resistance is the attachment portion 32 having the attachment hole 32a, it is not limited to this.

For example, in the embodiment shown in FIG. 7, a rectangular groove 33 is provided on the outer peripheral edge of the stator core 21, and a corresponding rectangular groove 34 is provided on the inner peripheral surface of the housing 30. , 34 to prevent rotation between the stator 11 and the housing 30. As shown in FIG. The grooves 33 and 34, like the mounting holes 32a, are air gaps and are regions A1 where thermal resistance is high. It is preferable to set so as to shift in the direction.

Also, when the stator core 21 is of a laminated type, the grooves 33 are used for welding the core material before and after lamination. It is preferable to set the magnetic pole regions B1 and B2 including the folded portions 22ua to 22wb of 22w2 so as to be displaced in the circumferential direction.

・Although the outer peripheral surface of the housing 30 is provided with the heat radiation fins 31, the heat radiation part is not limited to this, and may be changed to other structures such as those without the heat radiation fins 31 or those using a cooling fluid. may In addition, although 96 radiation fins 31 are provided, the number of fins is not limited to this, and may be changed as appropriate. Alternatively, the heat radiation fins 31 may be provided on the outer peripheral surface of the annular portion 21a of the stator core 21, and the housing 30 may be omitted. In this case, the annular portion 21a of the stator core 21 may also function as a housing.

For each of the folded portions 22ua to 22wb, the conductors 22x of the first and second coils 22u1 to 22w2 of the U-phase, V-phase and W-phase are alternately arranged on one side and on the other side. Although the arrangement is reversed, it may be changed as appropriate. For example, the conductors 22x on one side and the other side may be arranged in the same arrangement instead of being reversed. Also, instead of alternately arranging the conductors 22x one by one, the conductors 22x may be alternately arranged every two or more. Also, the conducting wires 22x may be alternately arranged for each coil unit.

- Although the stator 11 has 96 magnetic poles and the rotor 12 has 32 magnetic poles, the number of magnetic poles may be different. Also, in this case, the conducting wire 22x is wound every three teeth 21b and every three slots 21c, but this may also be changed as appropriate according to the number of magnetic poles.

- Although two parallel connections were made in the same phase, four or more parallel connections in the same phase may be used.
・The winding manner of the coils 22u1 to 22w2 is also an example, and may be changed as appropriate. Also, although the coils 22u1 to 22w2 are Y-connected, they may be delta-connected.

- You may change the structure of the rotary electric machine 10 suitably other than the above.
Technical ideas that can be grasped from the above embodiment and modifications will be described.
(a) A rotating electric machine in which the three-phase coil is composed of two parallel-connected first and second coils in the same phase.

(b) At the folded portion, the conductor wires of the coils in the adjacent winding range are mixed and arranged in a row in the radial direction, and the conductor wires of the adjacent coils are arranged alternately for each conductor wire or for each coil unit. A rotating electrical machine composed of

(c) A rotating electrical machine in which an even number of folded portions are provided, and the alternate arrangement of adjacent coils is reversed between the set on one side and the set on the other side.

DESCRIPTION OF SYMBOLS 10... Rotating electric machine 11... Stator 21... Stator core 21b... Teeth 21c... Slot 22... Coil (three-phase coil) 22x... Lead wire 22u1, 22v1, 22w1... First coil (coil), 22u2, 22v2, 22w2 second coils (coils), 22ua, 22ub, 22va, 22vb, 22wa, 22wb folding portion 30 housing 31 radiation fin 32 mounting portion 32a mounting hole 33, 34 Grooves A0 Areas of low thermal resistance A1, A2 Areas of high thermal resistance B1, B2 Areas of one magnetic pole including folded portions (areas of large heat generation).

Claims (2)

A three-phase coil (22) is provided in which a conducting wire (22x) is wound around teeth (21b) of a stator core (21), and a rotating magnetic field is generated based on the supply of a three-phase drive current to the three-phase coil. a stator (11) that causes
A rotating electric machine (10) including a housing (30) in which the stator is inscribed and fixed,
The stator has a configuration in which the amount of heat generated by the energization of the conductor wire is not uniform in the circumferential direction, and the housing has a configuration in which the heat resistance is not uniform in the circumferential direction,
Circumferential positions of the stator and the housing are set so that areas (B1, B2) of the stator having a large amount of heat generated become areas (A0) of the housing having a low thermal resistance,
The stator is wound by distributed winding in which the conductor wire straddles the plurality of teeth, and a plurality of coils are connected in parallel within the same phase of the three-phase coil,
The plurality of in-phase and parallel-connected coils (22u1, 22u2, 22v1, 22v2, 22w1, 22w2) are equal for each parallel-connected coil and set separately in the circumferential direction of the stator in each winding range, The slots (21c) assigned to the same phase are respectively wound by the reciprocating distributed winding, and the boundaries of the respective winding ranges are the reciprocating folded portions (22ua, 22ub, 22va, 22vb, 22ua, 22ub, 22va, 22vb, 22wa, 22wb),
The rotary electric machine , wherein the region of the stator where the amount of heat generated is large has at least one magnetic pole region (B1, B2) including the folded portion of each coil. A three-phase coil (22) is provided in which a conducting wire (22x) is wound around teeth (21b) of a stator core (21), and a rotating magnetic field is generated based on the supply of a three-phase drive current to the three-phase coil. a stator (11) that causes
a housing (30) in which the stator is inscribed and fixed;
A rotating electrical machine (10) comprising
The stator has a configuration in which the amount of heat generated by the energization of the conductor wire is not uniform in the circumferential direction, and the housing has a configuration in which the heat resistance is not uniform in the circumferential direction,
Circumferential positions of the stator and the housing are set so that areas (B1, B2) of the stator having a large amount of heat generated become areas (A0) of the housing having a low thermal resistance,
The housing has a plurality of radiating fins (31) on its outer peripheral surface, and the area where only the radiating fins are present is the low thermal resistance area,
The high thermal resistance areas (A1, A2) opposite to the low thermal resistance area include a mounting portion (32) having a mounting hole (32a) and a key member (35) for preventing rotation with the stator. A rotary electric machine comprising at least one of grooves (33, 34) used for insertion and grooves (33) used for welding core materials before and after lamination when the stator core is of a laminated type.

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