WO2017072944A1

WO2017072944A1 - Dynamo-electric machine

Info

Publication number: WO2017072944A1
Application number: PCT/JP2015/080691
Authority: WO
Inventors: 隆司梅田
Original assignee: 三菱電機株式会社
Priority date: 2015-10-30
Filing date: 2015-10-30
Publication date: 2017-05-04
Also published as: CN108352749B; JPWO2017072944A1; JP6407448B2; CN108352749A

Abstract

Given, in a dynamo-electric machine, a virtual base coil mounted state in which a virtual coil pair comprising two virtual specific coils and a virtual adjustment coil sandwiched between two virtual specific coils appear at fixed intervals, the base coils are arranged around the respective positions of all virtual specific coils and all virtual adjustment coils. The respective coil sides of each upper layer coil and each lower layer coil are arranged at the positions of the respective coil sides of each virtual specific coil. Slots sandwiched between one coil side and the other coil side of each upper layer coil, and slots sandwiched between one coil side and the other coil side of each lower layer coil are deep-groove slots for which, in addition to an upper aperture and a lower aperture, a lowest aperture also exists. One coil side and the other coil side of a plurality of the lowest layer coils are arranged at the lowest aperture of the deep-groove slot.

Description

Rotating electric machine

This invention relates to a rotating electrical machine having an armature and a rotor that rotates relative to the armature.

Conventionally, a rotating electric machine is known in which an armature is configured by winding a plurality of armature coils on a plurality of magnetic teeth of an armature core in two layers. Also, conventionally, by providing an additional coil in the armature core with the coil end tilted in the opposite direction to the coil end of the base coil provided in the armature core, rotation that maintains good operating characteristics of the rotating electric machine. An electric machine has been proposed (see, for example, Patent Document 1).

International Publication WO2015 / 121960

However, in the conventional rotating electric machine shown in Patent Document 1, when the additional coil is provided in the armature core, the armature core is avoided while avoiding the coil ends of other coils such as the base coil provided in the armature core. Since it is necessary to insert an additional coil into the slot, it is assumed that it takes time and labor to attach the additional coil to the armature core.

The present invention has been made to solve the above-described problems, and an object of the present invention is to obtain a rotating electrical machine that has good operating characteristics and can be easily manufactured.

A rotating electrical machine according to the present invention has a plurality of magnetic pole teeth spaced apart from each other in the circumferential direction, an armature core in which slots are formed between the magnetic pole teeth, and a pair of slots disposed in different slots. A plurality of armature coils each including a coil side and a coil end connecting between a pair of coil sides, each armature coil being wound on the magnetic pole teeth by lap winding, and a three-phase current flowing through each armature coil An armature coil group and a rotor having a plurality of magnetic poles arranged in the circumferential direction and rotating with respect to the armature core and the armature coil group, the armature coil group having one coil side at the top of the slot And a plurality of base coils in which the other coil side is arranged at the lower opening of the slot, and a plurality of upper layer coils in which one and the other coil sides are both arranged at the upper opening of the slot, Each of the one and the other coil sides has a plurality of lower layer coils arranged at the lower opening of the slot as an armature coil, and when N is a natural number of 2 or more, it is the number of slots per magnetic pole. The number of pole slots q ′ satisfies the relationship N <q ′ <N + 1, and the coil ends of each base coil straddle the N + 1 number of magnetic pole teeth in the same direction with respect to the circumferential direction of the armature core. Each coil end of each upper layer coil and each lower layer coil straddles the N magnetic pole teeth, and each coil side of a plurality of virtual base coils having the same configuration as the base coil is connected to the upper opening of each slot and The two temporary connections have the relationship that the currents flowing in the two coil sides respectively arranged in the upper openings of the two slots arranged at all of the lower openings and sandwiching the N magnetic pole teeth are in the opposite directions. A base coil is a virtual specific coil, a virtual base coil sandwiched between two virtual specific coils is a virtual adjustment coil, and a virtual coil pair and a virtual adjustment coil configured by two virtual specific coils are included in the armature core. Assuming a virtual base coil mounting state that appears at regular intervals in the circumferential direction, each base coil is arranged avoiding the respective positions of all virtual specific coils and all virtual adjustment coils, and each upper coil and each Each coil side of the lower layer coil is arranged at the position of each coil side of each virtual specific coil, and among each slot, a slot sandwiched between one and the other coil sides of each upper layer coil, and each lower layer coil The slot sandwiched between one and the other coil side is a deep groove type slot that has a lowermost opening in addition to an upper opening and a lower opening. The armature coil group further includes a plurality of lowermost coils, one of the other coil sides being arranged at the lowermost opening of the deep groove type slot, and the coil end of the lowermost coil is The upper layer coil, the lower layer coil, and the base coil are arranged so as to avoid the magnetic pole teeth that do not straddle, and the number of the magnetic pole teeth that the coil end of the lowermost layer coil straddles is the same in each lower layer coil.

According to the rotating electrical machine of the present invention, the operating characteristics are good and the manufacturing can be facilitated.

It is a block diagram which shows the rotary electric machine by Embodiment 1 of this invention. It is an expanded view which shows the armature of FIG. 5 is a configuration diagram showing a rotating electrical machine according to Comparative Example 1. FIG. It is an expanded view which shows the armature of the rotary electric machine of FIG. It is a principal part enlarged view of the armature of the rotary electric machine of FIG. 10 is a table showing a winding coefficient Kd of a rotating electrical machine according to Comparative Example 1. It is a table | surface which shows the winding coefficient Kd of the rotary electric machine of FIG. 10 is a configuration diagram showing a rotating electrical machine according to Comparative Example 2. FIG. It is an expanded view which shows the armature of FIG. 10 is a table showing a winding coefficient Kd of a rotating electrical machine according to Comparative Example 2. It is a block diagram which shows the rotary electric machine by Embodiment 2 of this invention. It is an expanded view which shows the armature of FIG. 12 is a table showing a winding coefficient Kd of the rotating electrical machine of FIG.

Preferred embodiments of the present invention will be described below with reference to the drawings.
Embodiment 1 FIG.
1 is a block diagram showing a rotating electrical machine according to Embodiment 1 of the present invention. In the figure, a rotating electrical machine 1 includes an armature 2 that is a cylindrical stator, a rotating shaft 3 disposed on an axis of the armature 2, an armature that is fixed to the rotating shaft 3 and is integrally formed with the rotating shaft 3. And a rotor 4 that is rotated with respect to 2.

The rotor 4 is disposed inside the armature 2. Further, the rotor 4 is provided on a cylindrical rotor core 5 made of a magnetic material (for example, iron) and an outer peripheral surface of the rotor core 5 (that is, a surface facing the inner peripheral surface of the armature 2). And a plurality of magnets 6 provided. The magnets 6 are arranged at intervals from each other in the circumferential direction of the rotor core 5. In the rotor 4, a plurality of magnetic poles arranged in the circumferential direction of the rotor core 5 are formed by the magnets 6. In this example, 14 magnets 6 are provided on the outer peripheral surface of the rotor core 5, and the number of magnetic poles P of the rotor 4 is 14.

The armature 2 has an armature core 7 made of a magnetic material (for example, iron) and an armature coil group 8 provided on the armature core 7.

The armature core 7 has a cylindrical back yoke 9 and a plurality of magnetic pole teeth 10 projecting radially inward from the inner peripheral portion of the back yoke 9 (that is, toward the rotor 4). The magnetic pole teeth 10 are provided at intervals in the circumferential direction of the armature core 7. Thereby, between each magnetic pole tooth 10, the slot 11 opened to the radial inside of the armature core 7 (that is, toward the rotor 4) is formed. In the armature core 7, the number of magnetic pole teeth 10 and the number of slots 11 (number of slots) Q are the same. In this example, the number of magnetic pole teeth 10 and the number of slots Q are both 36.

Here, for convenience of explanation, the slot 11 located directly above the center of the rotating shaft 3 in FIG. 1 is assumed. In addition, the reference slot number of FIG. The number of each slot 11 is set to No. 1 in the counterclockwise order. 2, No. 3,. 36. Further, No. 1 in FIG. 1 and no. No. 2 of the magnetic pole teeth 10 located between the two slots 11. 1 and no. No. 1 magnetic teeth 10 are numbered in the order of the counterclockwise order. 2, No. 3,. 36.

Further, the number of slots per pole (that is, the number of slots 11 per magnetic pole of the rotor 4) q ′, which is a coefficient indicating the relationship between the number of slots Q and the number of magnetic poles P, is expressed by the following equation (1). Is done.

Q '= Q / P (1)

Therefore, in this example, the value of the number of slots per pole q ′ is 36/14 = 18 / 7≈2.57.

FIG. 2 is a development view showing the armature 2 of FIG. The armature coil group 8 includes a plurality of base coils 12, a plurality of upper layer coils 13, a plurality of lower layer coils 14, and a plurality of lowermost layer coils 15 as armature coils.

Each of the base coil 12, the upper layer coil 13, the lower layer coil 14, and the lowermost layer coil 15 is composed of a wire bundle wound around a plurality of magnetic pole teeth 10. That is, each of the base coil 12, the upper layer coil 13, the lower layer coil 14, and the lowermost layer coil 15 is wound around the magnetic pole teeth 10 by lap winding. Further, the wire type and the number of turns of the conductor bundles constituting the base coil 12, the upper layer coil 13, the lower layer coil 14, and the lowermost layer coil 15 are all the same.

Each of the base coil 12, the upper layer coil 13, the lower layer coil 14, and the lowermost layer coil 15 includes a pair of coil sides 21 arranged in different slots 11 and a pair of coil sides 21 across the plurality of magnetic pole teeth 10. It has a pair of coil ends 22 to be connected. Each coil side 21 is a substantially straight portion along the slot 11. Each coil end 22 connects between the ends of the coil sides 21 outside the armature core 7 in the axial direction.

Among the plurality of slots 11 provided in the armature core 7, some of the slots 11 existing at regular intervals in the circumferential direction of the armature core 7 are deep groove-type slots 111, and other slots than the deep groove-type slots 111 are provided. The slot 11 is a normal slot 112.

The depth dimensions of each normal slot 112 are all the same. Each normal slot 112 has an upper opening (that is, an upper layer) and a lower opening (that is, a lower layer) that are spaces for arranging the coil sides 21. The upper opening of the normal slot 112 is located on the radially inner side of the armature core 7 (that is, the opening side of the normal slot 112) than the lower opening of the normal slot 112.

The depth dimensions of each deep groove type slot 111 are all the same. Further, each deep groove type slot 111 is deeper than each normal slot 112. Each deep groove type slot 111 has an upper opening (that is, an upper layer), a lower opening (that is, a lower layer), and a lowermost opening (that is, a lowermost layer) that are spaces for arranging the coil sides 21. The upper opening of the deep groove type slot 111 is located on the inner side in the radial direction of the armature core 7 (that is, the opening side of the deep groove type slot 111) than the lower opening of the deep groove type slot 111, and the lower opening of the deep groove type slot 111 is the deep groove type. It is located on the radially inner side of the armature core 7 (that is, the opening side of the deep groove type slot 111) from the lowermost opening of the slot 111.

The upper opening of each deep groove type slot 111 and each normal slot 112 exists at the same position in the radial direction of the armature core 7, and the lower opening of each deep groove type slot 111 and each normal slot 112 is the armature core 7. It exists in the same position about the radial direction. Therefore, the lowermost opening of each deep groove type slot 111 exists at a position radially outside the lower opening of the normal slot 112.

Each base coil 12 is provided on the armature core 7 in a state where one coil side 21 is disposed at the upper opening of the slot 11 and the other coil side 21 is disposed at the lower opening of the slot 11. Further, the coil end 22 of each base coil 12 straddles the plurality of magnetic pole teeth 10 while being inclined in the same direction with respect to the circumferential direction of the armature core 7.

If the coil pitch is the number of magnetic teeth 10 that the coil ends 22 straddle (that is, the number of magnetic teeth 10 sandwiched between one and the other coil sides 21 in a common coil), the coil pitch of each base coil 12 is all It is the same. Each base coil 12 is a long-pitch coil having a coil pitch larger than the number of slots per pole q ′.

The upper coil 13 is provided on the armature core 7 with one and the other coil sides 21 arranged at the upper opening of the slot 11. The lower layer coil 14 is provided on the armature core 7 with one and the other coil sides 21 arranged at the lower opening of the slot 11. The lowermost layer coil 15 is provided on the armature core 7 with one and the other coil sides 21 arranged at the lowermost opening of the deep groove type slot 111.

In FIG. 2, the phases of currents flowing through the base coils 12, the upper layer coils 13, the lower layer coils 14, and the lowermost layer coils 15 are indicated by U, V, and W, respectively. In FIG. 2, the direction of the current flowing through each coil side 21 is indicated by upper and lower case letters U, V, and W, and a black circle mark and an X mark in a white circle mark indicating the coil side 21. It shows with. Therefore, the winding direction of each

coil

12, 13, 14, 15 can be understood from the current direction of each coil side 21.

Here, in order to specify the respective positions of the base coils 12, the upper layer coils 13, the lower layer coils 14, and the lowermost layer coils 15 in the rotating electrical machine 1 according to the present embodiment, the upper layer coils 13 and the lower layer coils 14 are specified. And the rotary electric machine by the comparative example 1 which does not contain the lowermost layer coil 15 is assumed.

FIG. 3 is a configuration diagram illustrating the rotating electrical machine 1A according to the first comparative example. 4 is a development view showing the armature 2 of the rotating electrical machine 1A of FIG. Further, FIG. 5 is an enlarged view of a main part of the armature 2 of the rotating electrical machine 1A of FIG. 4 and 5, the current phase flowing through each coil and the direction of the current flowing through each coil side are shown in the same manner as in FIG.

The configuration of the rotating electrical machine 1A according to Comparative Example 1 is the same as the configuration of the rotating electrical machine 1 according to the first embodiment except for the configuration of the armature coil group 8 and the configuration of the slot 11 of the armature core 7. In Comparative Example 1, a normal slot 112 is provided in the armature core 7 instead of each deep groove type slot 111 according to the first embodiment. That is, in Comparative Example 1, all the slots 11 provided in the armature core 7 have the same configuration as the normal slots 112.

The armature coil group 8 according to Comparative Example 1 has only a plurality of virtual base coils 12 a having the same configuration as the base coil 12. Each virtual base coil 12 a has a pair of coil sides 21 a having the same configuration as the coil side 21 of the base coil 12 and a pair of coil ends 22 a having the same configuration as the coil end 22 of the base coil 12.

Each virtual base coil 12 a is regularly arranged on the armature core 7 with one coil side 21 a arranged at the upper opening of the slot 11 and the other coil side 21 a arranged at the lower opening of the slot 11. Each coil side 21a of each virtual base coil 12a is disposed in all the upper and lower openings of each slot 11. Thereby, the state of the armature 2 of the rotating electrical machine 1 A according to the comparative example 1 is a virtual base coil mounting state in which each virtual base coil 12 a is regularly arranged on the armature core 7 by two-layer lap winding.

The ideal state of a rotating electrical machine is that the magnitudes of the resultant vectors of the induced voltages produced by the U-phase, V-phase, and W-phase armature coils are the same, and the resultant vectors of the induced voltages of the phases are phase differences in terms of electrical angles. It is in a state of being distributed every 120 °. Therefore, in the rotating electrical machine 1A according to the comparative example 1, selection of the current phase (U phase, V phase, W phase) connected to each virtual base coil 12a and each virtual base coil so that the ideal state of the rotating electrical machine is obtained. Selection of the winding direction of 12a is performed. In the rotating electrical machine 1A, by adjusting the arrangement order of the virtual base coils 12a of each phase and the winding direction of the virtual base coils 12a, an induced voltage of approximately sinusoidal shape corresponding to the magnetic flux generated by the magnetic poles of the rotor 4 is obtained. It is supposed to occur.

In FIG. 1-No. 18 slot 11, 19-No. When divided into 36 slots 11, it can be seen that the arrangement of the virtual base coils 12 a of the respective phases is the same except that the direction of the current flowing through the coil side 21 a is reversed. This is because the value of the number of slots per pole q ′ of the rotating electrical machine 1A according to Comparative Example 1 is 18/7. That is, in the armature 2 in the comparative example 1, the seven magnetic poles correspond to one set corresponding to the eighteen slots 11, so that the arrangement of the virtual base coils 12a of each phase is eighteen. It is configured to be repeated in a group of slots 11.

In a virtual base coil mounting state in which each virtual base coil 12a is regularly stacked on the armature core 7 in a two-layer lap winding, if N is a natural number of 2 or more, the number of slots per pole q ′ is expressed by the following formula (2 ), The two virtual base coils 12a having a specific relationship with respect to the current phase and current direction are adjusted by adjusting the current phase and winding direction of the U phase, V phase, and W phase of each virtual base coil 12a. The virtual coil pairs 23 configured by the above can appear at regular intervals. Assuming that the two virtual base coils 12a constituting the virtual coil pair 23 are respectively the virtual specific coils 12A, the relationship between the two virtual specific coils 12A included in the common virtual coil pair 23 is 2 across the N magnetic pole teeth 10. The currents flowing in the two coil sides 21a arranged at the upper openings (or the lower openings) of the two slots 11 are in the same phase and opposite directions.

N <q '<N + 1 ... (2)

This is because the magnitudes of the synthesized vectors of the induced voltages generated by the U-phase, V-phase, and W-phase virtual base coils 12a are the same in each phase, and the phase difference of each synthesized vector is distributed every 120 °. This is because the arrangement of the virtual base coils 12a is determined so as to be in an ideal state.

Since the value of the number of slots per pole q ′ is about 2.57 as described above, it is a value larger than 2 and smaller than 3 (2 <q ′ <3). Therefore, it can be seen from the formula (2) that the configuration of the armature 2 of the rotating electrical machine 1A according to the comparative example 1 is the configuration of the armature 2 when N = 2. Each virtual base coil 12a in Comparative Example 1 is a coil in which the coil end 22a straddles the N + 1 magnetic pole teeth 10. From this, in the comparative example 1, the coil pitch of each virtual base coil 12a is 3.

Between the two virtual specific coils 12A included in the common virtual coil pair 23, N−1 virtual base coils 12a exist as virtual adjustment coils 12B. Similarly to the virtual coil pair 23, N−1 virtual adjustment coils 12B are also present at regular intervals in the circumferential direction of the armature core 7. In the armature 2 according to the comparative example 1, as illustrated in FIG. 4, the current phase of the virtual adjustment coil 12B and the current phase of the virtual coil pair 23 including the two virtual specific coils 12A sandwiching the virtual adjustment coil 12B are obtained. Are different from each other. In the armature 2 according to the comparative example 1, the current phase of the virtual adjustment coil 12B sandwiched between the virtual specific coil 12A of the V phase virtual coil pair 23 is sandwiched between the virtual specific coil 12A of the W phase and U phase virtual coil pair 23. The current phase of the virtual adjustment coil 12B sandwiched between the virtual specific coil 12A of the virtual coil pair 23 of the V phase and W phase virtual coil pair 23 is the U phase.

FIG. 6 is a table showing the winding coefficient Kd of the rotating electrical machine 1A according to Comparative Example 1. The winding coefficient Kd is an index indicating the characteristics of the rotating electrical machine. The torque characteristic is better as the numerical value of the fundamental wave component is closer to 1, and the higher frequency vibration is as the numerical value of higher order components such as fifth order, seventh order,. Indicates that the operating characteristics of the rotating electrical machine are good. In the rotating electrical machine 1A according to Comparative Example 1, it can be seen that the numerical value of the winding coefficient Kd shows a good tendency for both the fundamental wave component and the higher-order component.

In the rotating electrical machine 1 according to the first embodiment, when FIG. 2 is compared with FIG. 4, the positions of all the virtual specific coils 12A constituting each virtual coil pair 23 and the positions of all the virtual adjustment coils 12B are avoided. Each base coil 12 is arranged at the position of the virtual base coil 12a.

The coil end 22 of the base coil 12 straddles the N + 1 magnetic teeth 10. That is, the coil pitch of the base coil 12 is N + 1. In this example, since N = 2, the coil pitch of the base coil 12 is 3.

The coil sides 21 of the upper layer coil 13 and the lower layer coil 14 are arranged at the positions of the coil sides 21a of the virtual specific coil 12A where the arrangement of the base coil 12 is avoided. Thereby, the upper layer coil 13 and the lower layer coil 14 are arranged one by one for the common virtual coil pair 23 in which the arrangement of the base coil 12 is avoided. Therefore, the number of the upper layer coils 13 and the number of the lower layer coils 14 included in the armature coil group 8 are the same. The coil ends 22 of the upper layer coil 13 and the lower layer coil 14 straddle the N magnetic pole teeth 10. That is, the coil pitch of each of the upper layer coil 13 and the lower layer coil 14 is N (N = 2 in this example).

The current phase of the upper layer coil 13 is the same as the current phase of the virtual coil pair 23 having the coil side 21 a corresponding to the coil side 21 of the upper layer coil 13. Further, the winding direction of the upper layer coil 13 is determined so that the direction of the current flowing through the coil side 21 of the upper layer coil 13 is the same as the direction of the current flowing through the coil side 21a of the virtual specific coil 12A.

The current phase of the lower coil 14 is the same as the current phase of the virtual coil pair 23 having the coil side 21 a corresponding to the coil side 21 of the lower coil 14. Further, the winding direction of the lower layer coil 14 is determined so that the direction of the current flowing through the coil side 21 of the lower layer coil 14 is the same as the direction of the current flowing through the coil side 21a of the virtual specific coil 12A.

That is, the armature 2 according to the present embodiment is different from the armature 2 according to the comparative example 1 in that the base coil 12 at the position of each virtual specific coil 12A is eliminated when FIG. 2 is compared with FIG. . If the base coil 12 at the position of each virtual specific coil 12A is simply eliminated, the induced voltage produced by the armature 2 will decrease, but in the armature 2 according to the present embodiment, each coil of each virtual specific coil 12A. Either the coil side 21 of the upper layer coil 13 or the coil side 21 of the lower layer coil 14 is disposed at the position of the side 21a. Thereby, the fall of the induced voltage by having eliminated the base coil 12 of the position of each virtual specific coil 12A is prevented.

Here, as shown in FIG. 4, three virtual adjustment coils 12B (for example, No. 2, No. 8, No. 14) that are adjacent to each other in the circumferential direction of the armature core 7 and have different current phases are used. The U-phase, V-phase, and W-phase virtual adjustment coils 12B) having the coil sides 21a arranged at the upper openings of the slots 11 are virtual base coils 12a that generate induced voltages having a phase difference of 120 °. . Thereby, in the armature 2 of the rotating electrical machine 1A, when all the virtual adjustment coils 12B are eliminated, the magnitudes of the respective synthesized vectors of the induced voltages generated by the U-phase, V-phase, and W-phase virtual base coils 12a are In the same manner, it is possible to maintain a state in which the phase difference of the combined vector of the induced voltage of each phase is distributed every 120 ° in electrical angle. Also, the U-phase, V-phase, and W-phase virtual adjustment coils 12B exist in the same number (one in this example) within the range of the electrical angle width α °. The electrical angle width α ° is determined depending on the number of slots Q and the number of magnetic poles P, that is, the number of slots per pole q ′, and is expressed by the following equation (3).

Α ° = 180 ° × P / gcd (Q, P) = 1260 ° (3)

However, gcd (Q, P) is the greatest common divisor of the number of slots Q and the number of magnetic poles P of the rotor 4.

In the present embodiment, as described above, the base coil 12 is arranged avoiding all positions of the virtual adjustment coils 12B. Therefore, in the present embodiment, it is possible to prevent the relationship between the magnitude of the combined vector and the phase difference between the induced voltages generated by the U-phase, V-phase, and W-phase base coils 12 from being lost.

In the armature core 7 according to the present embodiment, when FIG. 2 is compared with FIG. 4, all the slots 11 that accommodate the coil sides 21 a of the virtual adjustment coils 12 B in the virtual base coil mounted state are all deep groove type slots. 111. That is, in the armature core 7 according to the present embodiment, as shown in FIG. 2, each slot 11 sandwiched between one and the other coil sides 21 of each upper coil 13 and one and the other of each lower coil 14. Each slot 11 sandwiched between the coil sides 21 is a deep groove type slot 111.

Therefore, in the present embodiment, each deep groove type slot 111 exists for every three slots 11. That is, in this embodiment, No. 2, No. 5, no. 8, no. 11, no. 14, no. 17, no. 20, no. 23, no. 26, no. 29, no. 32, no. The 35 slots 11 are deep groove type slots 111.

As shown in FIG. 2, the coil ends 22 of the base coil 12, the upper layer coil 13, and the lower layer coil 14 do not straddle between the upper layer coil 13 and the lower layer coil 14 corresponding to the common virtual coil pair 23. The magnetic pole teeth 10 are present. Each coil end 22 of each lowermost layer coil 15 has a magnetic pole tooth 10 (in this example, No. 6, No. 12, No. 18, No. 18) on which none of the base coil 12, the upper layer coil 13 and the lower layer coil 14 straddles. No. 24, No. 30, and No. 36 magnetic pole teeth 10) are arranged so as to be avoided. Further, the number of magnetic pole teeth 10 straddled by the coil ends 22 of the lowermost layer coils 15 is the same in each lowermost layer coil 15. In the present embodiment, each coil end 22 of each lowermost layer coil 15 straddles the three magnetic pole teeth 10. That is, the coil pitch of each lowermost layer coil 15 is 3.

One and the other coil sides 21 of the lowermost layer coil 15 are disposed at the lowermost openings of the two deep groove slots 111 adjacent to each other. Thereby, each coil end 22 of each lowermost layer coil 15 is parallel to the circumferential direction of the armature core 7.

That is, of the two virtual coil pairs 23 adjacent to each other, the lowermost layer of the deep groove type slot 111 sandwiched between the pair of coil sides 21 of the upper layer coil 13 corresponding to the one virtual coil pair 23 is the lowermost layer. One coil side 21 of the coil 15 is disposed, and the lowermost layer coil 15 is disposed at the lowermost opening of the other deep groove type slot 111 sandwiched between the pair of coil sides 21 of the lower layer coil 14 corresponding to the other virtual coil pair 23. The other coil side 21 is arranged.

The current phase of the lowermost layer coil 15 is the current phase of the upper layer coil 13 having a pair of coil sides 21 sandwiching one deep groove type slot 111 and the lower layer coil 14 having a pair of coil sides 21 sandwiching the other deep groove type slot 111. The phase is different from each of the current phases. For example, no. 2 and no. The current phase of the lowermost layer coil 15 having the coil side 21 disposed at the lowermost opening of each of the deep groove type slots 111 of No. 5 is No. 5. V-phase upper layer coil 13 having a pair of coil sides 21 sandwiching two deep groove-type slots 111 (that is, upper layer coil 13 having coil sides 21 arranged at the upper openings of No. 1 and No. 3 slots 11) Current phase, and no. U-phase lower layer coil 14 having a pair of coil sides 21 sandwiching the deep groove type slot 111 of No. 5 (that is, the lower layer coil 14 having the coil side 21 disposed at the lower opening of the No. 4 and No. 6 slots 11) The W phase is different from each of the current phases.

The direction of the current on the coil side 21 of each lowermost layer coil 15 is the deep groove type slot in which the coil side 21 of the lowermost layer coil 15 is arranged among the coil sides 21 of the base coil 12 in the same phase as the lowermost layer coil 15. The direction of the current flowing in the coil side 21 arranged at 111 is the same.

The current phases of the three lowermost coils 15 adjacent to each other in the circumferential direction of the armature core 7 are different from each other as shown in FIG. For example, no. 2, No. 8, no. The current phases of the three lowest-layer coils 15 having the coil sides 21 arranged at the lowermost openings of the 14 deep groove-type slots 111 are different W-phase, V-phase, and U-phase, respectively.

That is, each deep groove type slot 111 in which each one coil side 21 of each phase which is different from each other, that is, each U-phase, V-phase, and W-phase bottom layer coil 15 is arranged, is in the circumferential direction of the armature core 7. It appears for every n slots 11 represented by the following formula (4).

N = Q / {gcd (Q, P) × m} (4)

However, m is the number of phases of the armature coil group 8 (in this example, m = 3).

In this example, each deep groove type slot 111 (for example, each No. 2, No. 8, No. 14 deep groove type slot in which one coil side 21 of each lowermost layer coil 15 of a different phase is arranged. 111) appears for each of the six slots 11, and the relationship of Expression (4) is established.

Therefore, the three lowermost coils 15 adjacent to each other in the circumferential direction of the armature core 7 are coils that generate an induced voltage having a phase difference of 120 °. Thereby, in the armature 2 of the rotating electrical machine 1A, even when the lowermost layer coil 15 is added to the armature core 7 and the coil sides 21 of the lowermost layer coil 15 are arranged in all the deep groove type slots 111, the U phase, The magnitudes of the combined vectors of the induced voltages generated by the V-phase and W-phase armature coils 12, 13, 14, and 15 are the same, and the phase difference of the combined vectors of the induced voltages of the phases is 120 ° in electrical angle. Can be maintained.

As with the virtual adjustment coil 12B, the U-phase, V-phase, and W-phase lowermost coils 15 are arranged in the same number (one in this example) within the range of the electrical angle width α °. As a result, in the armature 2 according to the present embodiment, the magnitude of the resultant vector of the induced voltage generated by the base coil 12, the upper layer coil 13, and the lower layer coil 14 is equally large in each phase by the addition of each lowermost layer coil 15. Become.

The armature core 7 is divided into a plurality (two in this example) of divided cores 31 arranged in the circumferential direction of the armature core 7. The divided cores 31 are connected to each other by welding or the like, for example. The position of the boundary 32 of each divided core 31 is such that the magnetic pole teeth 10 (No. 18 in this example) in which none of the coil ends 22 of the base coil 12, the upper layer coil 13, the lower layer coil 14 and the lowermost layer coil 15 straddle. And No. 36 magnetic pole teeth 10). The boundary 32 of each divided core 31 is formed along the radial direction of the armature core 7. The armature 2 is constituted by a plurality (two in this example) of divided armatures 33 each having a base coil 12, an upper layer coil 13, a lower layer coil 14, and a lowermost layer coil 15 provided in a divided core 31.

FIG. 7 is a table showing the winding coefficient Kd of the rotating electrical machine 1 of FIG. It can be seen that the numerical value of the winding coefficient Kd of the rotating electrical machine 1 according to the present embodiment is good for both the fundamental wave component and the higher-order component even when compared with the winding coefficient Kd of the rotating electrical machine 1A of Comparative Example 1.

When the armature 2 is manufactured, the armature 2 is manufactured by manufacturing a plurality of divided armatures 33 in advance, arranging the divided armatures 33 in a ring shape, and fixing the divided cores 31 to each other.

When the split armature 33 is manufactured, the coil sides 21 are inserted into the slots 11 of the split core 31 in the order of the lowermost layer coils 15, the lower layer coils 14, the base coils 12, and the upper layer coils 13. The child coils 12 to 15 are attached to the split core 31. Thereby, the split armature 33 is completed.

In the split armature 33, there are magnetic teeth 10 at regular intervals where none of the coil ends 22 of the armature coils 12 to 15 straddle. Therefore, when the split armature 33 is manufactured, the work of sequentially mounting the lowermost layer coil 15, the lower layer coil 14, the base coil 12, and the upper layer coil 13 to the split core 31 is performed between the magnetic pole teeth 10 where the coil end 22 does not straddle. It may be performed individually for each section.

In such a rotating electric machine 1, the slot 11 that accommodates the coil side 21 a of the virtual adjustment coil 12 B in the virtual base coil mounted state is a deep groove type slot 111 that is deeper than the normal slot 112, and one of the lowermost layer coils 15. Since the other coil side 21 is disposed at the lowermost opening of the deep groove type slot 111, the lowermost layer coil 15 may be disposed away from the base coil 12 in the radial direction of the armature core 7. It is possible to avoid the coil end 22 of the lowermost layer coil 15 from intersecting with the coil end 22 of the base coil 12. Thus, when the base coil 12, the upper layer coil 13, the lower layer coil 14, and the lowermost layer coil 15 are wound around the armature core 7, the coil ends 22 of the coils 12 to 15 are prevented from interfering with each other. The armature 2 can be easily manufactured. Also, each lower layer coil 15 generates an induced voltage that increases the magnitude of the resultant vector of the induced voltage generated by the base coil 12, the upper layer coil 13, and the lower layer coil 14 in each phase (U phase, V phase, W phase). It is possible to prevent a decrease in the induced voltage of each phase while maintaining the balance of the induced voltage of each phase (U phase, V phase, W phase) of the armature coil group 8. Thereby, the operating characteristic of the rotary electric machine 1 can be maintained satisfactorily.

The armature core 7 is divided into a plurality of divided cores 31 arranged in the circumferential direction of the armature core 7, and the position of the boundary 32 of each divided core 31 spans all the armature coils 12 to 15. Therefore, the base coil 12, the upper layer coil 13, the lower layer coil 14, and the lowermost layer coil 15 can be wound around each divided core 31. Accordingly, it is possible to facilitate the mounting operation of the coils 12 to 15 to the split core 31 and to facilitate the manufacture of the armature 2.

Further, since the armature 2 is composed of a plurality of divided armatures 33, each component constituting the armature 2 can be reduced in size and weight. Thereby, even after completion of the rotating electrical machine 1, the armature 2 can be disassembled and reassembled in units of the split armature 33, and workability such as repair and maintenance of the rotating electrical machine 1 can be improved. Further, even when the armature 2 is damaged, it is not necessary to repair and replace the entire armature 2, thereby reducing the cost required for repairing and replacing the rotating electrical machine 1 and shortening the working time. it can.

Embodiment 2. FIG.
Before describing the rotating electrical machine 1 according to Embodiment 2, the configuration of the rotating electrical machine 1B according to Comparative Example 2 will be described.

FIG. 8 is a configuration diagram showing the rotating electrical machine 1B according to the second comparative example. FIG. 9 is a development view showing the armature 2 of FIG. In the rotating electrical machine 1B according to the comparative example 2, as in the comparative example 1, each virtual base coil 12a is in a virtual base coil mounting state in which the virtual base coils 12a are regularly arranged on the armature core 7 by two-layer wrapping. In the rotating electrical machine 1B according to the comparative example 2, the number Q of the slots 11 is 54, and the number of magnetic poles P of the rotor 4 is 14. Therefore, the value of the number of slots per pole q ′ in Comparative Example 2 is 27/7 (≈3.85), which is a value larger than 3 and smaller than 4 (3 <q ′ <4). ing. From this, the configuration of the armature 2 of the rotating electrical machine 1B according to the comparative example 2 is the configuration of the armature 2 when N = 3 from Expression (2). That is, in Comparative Example 2, the coil pitch of each virtual base coil 12a is N + 1 = 4.

In Comparative Example 2, focusing on the U phase, no. 1 and no. 4 of the slot 11 of No. 4, 24 and no. No. 27 of slot 11 of

slot

27, 28 and no. No. 31 of the slot 11 slot No. 51 and no. It can be seen that a set of coil sides 21a through which currents in the opposite phase flow are arranged at the lower openings of the 54 slots 11. In addition, each pair of coil sides 21a through which in-phase and reverse currents flow are respectively located at the upper openings. 1 and no. 4 slot 11 and No. 4 slot. 28 and no. No. 31 has a slot 11 distance of 27 slots, and a pair of coil sides 21a through which currents in the same phase and opposite direction flow are located in the lower opening. 24 and no. 27 slot 11 and no. 51 and no. It can be seen that the distance between the 54 slots 11 is also 27 slots. Furthermore, no. 1 and no. 4 of the slot 11 of No. 4, 51 and no. 54, the coil sides 21a of the lower openings of the slots 11 are the coil sides 21a of two common virtual base coils 12a. 28 and no. No. 31 of the slot 11 slot No. 24 and no. It can be seen that the coil sides 21a of the lower openings of the 27 slots 11 are also the coil sides 21a of the two common virtual base coils 12a. For this reason, in FIG. 9, currents in the same phase and opposite directions are applied to the two coil sides 21 a of the upper slots (or the lower slots) of the two slots 11 sandwiching the three (N = 3) magnetic pole teeth 10. It can be seen that the two virtual base coils 12a having the flowing relationship become the virtual specific coils 12A, respectively, and the virtual coil pairs 23 constituted by the two virtual specific coils 12A are arranged at intervals of 27 slots. For the V phase and the W phase, as with the U phase, the virtual coil pairs 23 are arranged at intervals of 27 slots.

The order of the current phase of each virtual coil pair 23 appearing at a fixed slot interval is such that each phase (U phase, V phase, W phase) is repeated in the same order. In the virtual base coil 12a of FIG. 1 and no. 4 is a U-phase, no. 10 and no. The virtual coil pair 23 having the two coil sides 21a between the upper ends of the top 13 is the W phase, 19 and No. Since the virtual coil pair 23 having the two coil sides 21a between the upper ends of the 22 is the V phase, the set arranged in the order of the U phase, the W phase, and the V phase is repeated.

Also, in the rotating electrical machine 1B according to the comparative example 2, a plurality of virtual base coils 12a exist as virtual adjustment coils 12B between two virtual specific coils 12A included in the common virtual coil pair 23. In Comparative Example 2, since N = 3, there are two (that is, N−1 = 2) virtual adjustment coils 12B between the two virtual specific coils 12A included in the common virtual coil pair 23. ing. Further, the two virtual adjustment coils 12 B existing between the two virtual specific coils 12 A of the common virtual coil pair 23 are present at the same interval as the virtual coil pair 23 in the circumferential direction of the armature core 7. Further, in the armature 2 according to the comparative example 2, similarly to the comparative example 1, the current phase of the two virtual adjustment coils 12B and the virtual coil pair 23 configured by the two virtual specific coils 12A sandwiching the virtual adjustment coil 12B. Current phases are different from each other. Therefore, in the armature 2 according to the comparative example 2, the current phases of the two virtual adjustment coils 12B sandwiched between the virtual specific coils 12A of the U-phase virtual coil pair 23 are V-phase, W-phase, and W-phase virtual coil pairs. The current phases of two virtual adjustment coils 12B sandwiched between 23 virtual specific coils 12A are V-phase, U-phase, and V-phase virtual coil pairs 23 of two virtual adjustment coils 12B sandwiched between virtual specific coils 12A. The current phase is the U phase and the W phase.

Each U-phase, V-phase, and W-phase virtual adjustment coil 12B is a virtual base coil 12a that generates an induced voltage with a phase difference of 120 °. In addition, the U-phase, V-phase, and W-phase virtual adjustment coils 12B have the same number within the range of the electrical angle width α ° (α ° = 1260 °) expressed by Expression (3) (in this example, 2 Exist) one by one. Other configurations of Comparative Example 2 are the same as those of Comparative Example 1.

FIG. 10 is a table showing the winding coefficient Kd of the rotating electrical machine 1B according to Comparative Example 2. In the rotating electrical machine 1B according to Comparative Example 2, it can be seen that the numerical value of the winding coefficient Kd shows a good tendency for both the fundamental wave component and the higher-order component.

FIG. 11 is a block diagram showing a rotating electrical machine 1 according to Embodiment 2 of the present invention. FIG. 12 is a development view showing the armature 2 of FIG. When comparing FIG. 12 with FIG. 9, each base coil 12 avoids the positions of all the virtual specific coils 12A and all the virtual adjustment coils 12B included in the virtual coil pair 23 of each phase, The virtual base coil 12a is disposed at the position. Thereby, each coil end 22 of each base coil 12 straddles four (N + 1 = 4) magnetic pole teeth 10. That is, the coil pitch of each base coil 12 is 4. The coil sides 21 of the upper layer coil 13 and the lower layer coil 14 are arranged at the positions of the coil sides 21a of the virtual specific coils 12A of the respective phases where the arrangement of the base coil 12 is avoided. Each coil end 22 of the upper layer coil 13 and the lower layer coil 14 straddles three (N = 3) magnetic pole teeth 10. That is, the coil pitch of each of the upper layer coil 13 and the lower layer coil 14 is 3.

In the armature core 7 according to the present embodiment, when FIG. 12 is compared with FIG. 9, all the slots 11 that accommodate the respective coil sides 21a of the virtual adjustment coils 12B in the virtual base coil mounted state are deep groove type slots. 111. That is, in the armature core 7 according to the present embodiment, as shown in FIG. 12, each slot 11 sandwiched between one and the other coil sides 21 of each upper layer coil 13 and one and the other of each lower layer coil 14. Each slot 11 sandwiched between the coil sides 21 is a deep groove type slot 111.

In the present embodiment, the number of deep groove type slots 111 sandwiched between the common upper layer coils 13 and the number of deep groove type slots 111 sandwiched between the common lower layer coils 14 are each two (plural). .

Of the two different deep groove slots 111 sandwiched between the common upper layer coils 13, one deep groove slot 111 is the first deep groove slot 111A, and the other deep groove slot 111 is the second deep groove slot 111. 111B. Of the two different deep groove slots 111 sandwiched between the common lower layer coils 14, one deep groove slot 111 is the first deep groove slot 111A, and the other deep groove slot 111 is the second deep groove slot 111. The mold slot 111B is used. The first deep groove type slots 111A exist at regular intervals in the circumferential direction of the armature core 7, and the second deep groove type slots 111B are the same as the first deep groove type slots 111A in the circumferential direction of the armature core 7. It exists at regular intervals.

The depth dimension of the first deep groove type slot 111A and the depth dimension of the second deep groove type slot 111B are different from each other. Accordingly, the position of the lowermost opening of the first deep groove type slot 111A and the position of the lowermost opening of the second deep groove type slot 111B are different from each other in the radial direction of the armature core 7. In the present embodiment, the depth dimension of each first deep groove type slot 111A is smaller than the depth dimension of each second deep groove type slot 111B. Therefore, in the present embodiment, the lowermost opening of each first deep groove type slot 111A is located radially inward from the lowermost opening of each second deep groove type slot 111B.

The depth dimensions of the first deep groove type slots 111A are the same, and the depth dimensions of the second deep groove type slots 111B are also the same. The lower opening of each of the normal slot 112 and the first and second deep

groove type slots

111A and 111B is located radially inward from the lowermost opening of each of the first and second deep

groove type slots

111A and 111B. Yes. The upper opening of each of the normal slot 112 and the first and second deep

groove type slots

111A and 111B is radially inward of the lower opening of each of the normal slot 112 and the first and second deep

groove type slots

111A and 111B. positioned.

Each coil side 21 of each lowermost layer coil 15 is the bottom of each of all the deep groove type slots 111 (that is, all the first and second deep

groove type slots

111A and 111B), as in the first embodiment. Placed in the mouth. In the present embodiment, four U-phase, V-phase, and W-phase lowermost coils 15 are provided on the armature core 7 by four.

One and the other coil sides 21 of the common lowermost layer coil 15 are respectively disposed in two deep groove type slots 111 having the same depth dimension. In the armature 2 according to the present embodiment, the lowermost layer coil 15 having a pair of coil sides 21 arranged at the lowermost openings of the different first deep groove type slots 111A is defined as the first lowermost layer coil 15A. The lowermost layer coil 15 having a pair of coil sides 21 arranged at the lowermost opening of the different second deep groove type slots 111B is defined as the second lowermost layer coil 15B. Therefore, in the present embodiment, the first lowermost layer coil 15A is disposed radially inward from the second lowermost layer coil 15B. Further, the coil ends 22 of the first and second lowermost layer coils 15 A and 15 B are parallel to the circumferential direction of the armature core 7.

The first lowermost layer coil 15 A is a first deep groove type slot sandwiched between a pair of coil sides 21 of the upper layer coil 13 corresponding to one virtual coil pair 23 out of two adjacent virtual coil pairs 23. One coil side 21 is arranged at the lowermost port of 111A, and the lowermost port of the first deep groove type slot 111A sandwiched between the pair of coil sides 21 of the lower layer coil 14 corresponding to the other virtual coil pair 23. The armature core 7 is provided with the other coil side 21 disposed.

The second lowermost layer coil 15B is a second deep groove-type slot sandwiched between a pair of coil sides 21 of the upper layer coil 13 corresponding to one virtual coil pair 23 out of two virtual coil pairs 23 adjacent to each other. One coil side 21 is arranged at the lowermost opening of 111B, and at the lowermost opening of the second deep groove type slot 111B sandwiched between the pair of coil sides 21 of the lower layer coil 14 corresponding to the other virtual coil pair 23. The armature core 7 is provided with the other coil side 21 disposed.

The first and second lowermost layer coils 15A, 15B are magnetic pole teeth 10 (No. 9, No. 18, No. 27, No. 36) in which none of the base coil 12, the upper layer coil 13 and the lower layer coil 14 straddles. , No. 45, No. 54 magnetic pole teeth 10) are disposed. The first deep groove type slots 111A are present at regular intervals in the circumferential direction of the armature core 7, and the second deep groove type slots 111B are also at regular intervals in the circumferential direction of the armature core 7 as with the first deep groove type slots 111A. Exists. Thereby, the number of the magnetic teeth 10 which each coil end 22 of 1st and 2nd

lowest layer coil

15A, 15B straddles is the same in each 1st and 2nd

lowest layer coil

15A, 15B. . That is, the coil pitches of the first and second

lowermost coils

15A and 15B are all the same. In the present embodiment, the number of magnetic pole teeth 10 that the coil ends 22 of the first and second lowermost layer coils 15A and 15B straddle is five.

The first and second lowermost layer coils 15A and 15B are the first sandwiched between the pair of coil sides 21 of the common upper layer coil 13 (or the common lower layer coil 14) when FIG. 12 is compared with FIG. The first and second

lowermost coils

15A, 15B having the coil sides 21 arranged in the second deep

groove type slots

111A, 111B are adjacent to each other in the radial direction of the armature core 7. The coil sides 21 of the first and second bottom layer coils 15A and 15B are accommodated in the coil sides 21 of the first and second bottom layer coils 15A and 15B adjacent to each other in the radial direction of the armature core 7. Other coil sides 21 arranged in the first or second deep

groove type slots

111A and 111B, and coil sides 21 arranged in the two slots 11 adjacent to the deep

groove type slots

111A and 111B, respectively A current in the same direction as any of the above flows.

In the present embodiment, the current phases of the first and second

lowermost coils

15A and 15B adjacent to each other in the radial direction of the armature core 7 are the same as each other. In the present embodiment, the current phases of the first and second

lowermost coils

15A and 15B adjacent to each other in the radial direction of the armature core 7 are the first and second

lowermost coils

15A and 15B. Are different from the current phases of the upper layer coil 13 and the lower layer coil 14 sandwiching the first and second deep

groove type slots

111A and 111B located on both sides of the coil. That is, the current phases of the first and second lowermost layer coils 15 adjacent to each other in the radial direction of the armature core 7 are a pair of coil sides sandwiching the first and second deep groove type slots 111A and 111B. 21 and a current phase of the lower layer coil 14 having a pair of coil sides 21 sandwiching the other first and second deep

groove type slots

111A and 111B.

For example, No. Current phase of the first lowermost layer coil 15A having the coil side 21 arranged at the lowermost opening of the first deep groove type slot 111A, and No. 2 3, the current phase of the second lowermost layer coil 15B having the coil side 21 arranged at the lowermost opening of the second deep groove type slot 111B is No. 3. 2 and no. U-phase upper coil 13 having a pair of coil sides 21 sandwiching three deep

groove type slots

111A and 111B (that is, an upper layer coil having coil sides 21 disposed at the upper openings of No. 1 and No. 4 slots 11) 13), and No. 13). 7 and no. W-phase lower layer coil 14 having a pair of coil sides 21 sandwiching the eight deep

groove type slots

111A and 111B (ie, a lower layer coil having a coil side 21 disposed at the lower opening of the slots 11 of No. 6 and No. 9) 14) The V phase is different from each of the current phases.

Moreover, the direction of the current of the coil side 21 of the first and second lowest layer coils 15A and 15B is the coil side 21 of the base coil 12 in the same phase as the first and second lowest layer coils 15A and 15B. The direction of the current flowing in the coil side 21 arranged in the first and second deep

groove type slots

111A and 111B in which the coil sides 21 of the first and second lowermost layer coils 15A and 15B are arranged is the same. Yes.

Within the range of electrical angle width α ° (α = 1260 °), the same number of U-phase, V-phase, and W-phase first lowermost coils 15A are arranged (one in this example), and the U-phase , V-phase, and W-phase second lowermost layer coils 15B are arranged in the same number (one in this example).

That is, each first deep groove type slot 111A in which each one coil side 21 of each first lowermost layer coil 15A having a different phase is arranged in the circumferential direction of the armature core 7 ( It appears for every n slots 11 represented by 4). In addition, each second deep groove type slot 111B in which each one coil side 21 of each second lowermost layer coil 15B having a different phase is arranged in the circumferential direction of the armature core 7 (the above formula ( It appears for every n slots 11 represented by 4). In this example, each of the first deep groove type slots 111A (for example, No. 2, No. 11, No. 20) in which each one coil side 21 of each first lowermost layer coil 15A is arranged. 1 deep groove type slot 111A), and each second deep groove type slot 111B (for example, No. 3, No. 12, No. 12) in which one coil side 21 of each second lowermost layer coil 15B is arranged. .22 each of the second deep groove type slots 111B) appears for every nine slots 11, and the relationship of equation (4) is established.

As a result, in the armature 2 according to the present embodiment, the magnitude of the resultant vector of the induced voltage generated by the base coil 12, the upper layer coil 13, the lower layer coil 14, and the lowermost layer coils 15A and 15B is evenly increased in each phase.

The armature core 7 is divided into a plurality (two in this example) of divided cores 31 arranged in the circumferential direction of the armature core 7. The divided cores 31 are connected to each other by welding or the like, for example. The positions of the boundaries 32 of the divided cores 31 are the magnetic pole teeth 10 (in this example, No. .27 and No. 54 magnetic pole teeth 10). The boundary 32 of each divided core 31 is formed along the radial direction of the armature core 7. The armature 2 is constituted by a plurality (two in this example) of divided armatures 33 configured by providing the divided core 31 with the base coil 12, the upper layer coil 13, the lower layer coil 14, and the lowermost layer coils 15A and 15B. Yes. Other configurations are the same as those in the first embodiment.

FIG. 13 is a table showing the winding coefficient Kd of the rotating electrical machine 1 of FIG. The numerical value of the winding coefficient Kd of the rotating electrical machine 1 according to the present embodiment is good for both the fundamental wave component and the higher-order component even when compared with the winding coefficient Kd of the rotating electrical machine 1B according to Comparative Example 2 (FIG. 10). I understand that.

As described above, even when the number of slots per pole q ′ is larger than 3 and smaller than 4, the same effect as in the first embodiment can be obtained.

That is, as shown in the first and second embodiments, regardless of the combination of the number Q of slots of the armature 2 of the rotating electrical machine 1 and the number of magnetic poles P of the rotor 4, the number of slots per pole q ′ is expressed by the formula (2 If the condition (1) is satisfied, the upper layer coil 13 and the lower layer coil 14 having a coil pitch N smaller than the coil pitch N + 1 of each base coil 12 can be obtained while maintaining the arrangement of the coil sides 21. Further, by arranging the coil sides 21 of the lowermost layer coils 15 of the respective phases at the lowermost openings of the deep groove type slots 111, the outer sides in the radial direction from the base coil 12, the upper layer coil 13, and the lower layer coil 14, respectively. Each lowermost layer coil 15 can be arranged by removing. Thereby, manufacture of the rotary electric machine 1 can be made easy, maintaining the operating characteristic of the rotary electric machine 1 favorable.

In each of the above embodiments, the armature core 7 is divided into the plurality of divided cores 31, but the armature core 7 may be a single component that is not divided into the plurality of divided cores 31.

Moreover, in each said embodiment, although this invention is applied to the inner rotor type rotary electric machine 1 by which the rotor 4 is arrange | positioned inside the armature 2, it is not limited to this, A cylindrical rotor is used. The present invention may be applied to an outer rotor type rotating electrical machine in which an armature is disposed on the inner side. Furthermore, not only a radial gap type (ie, inner rotor type and outer rotor type) rotating electric machine in which the armature and the rotor face each other in the radial direction, but also an axial gap type in which the armature and the rotor face each other in the axial direction. The present invention may be applied to a rotating electric machine.

Further, the rotating electrical machine 1 according to each of the above embodiments can be applied to any of an electric motor, a generator, and a generator motor, for example. Moreover, the rotary electric machine 1 by each said embodiment can also be applied to induction machines other than a synchronous machine, for example.

Claims

An armature core having a plurality of magnetic pole teeth spaced apart from each other in the circumferential direction and having slots formed between the magnetic pole teeth;
It has a plurality of armature coils each including a pair of coil sides arranged in different slots and a coil end connecting the pair of coil sides, and each armature coil is wound around the magnetic pole teeth by lap winding. Each armature coil includes an armature coil group through which a three-phase current flows, and a plurality of magnetic poles arranged in the circumferential direction, and a rotor that is rotated with respect to the armature core and the armature coil group,
The armature coil group includes a plurality of base coils in which one of the coil sides is disposed at the upper opening of the slot and the other coil side is disposed at the lower opening of the slot; Both have a plurality of upper layer coils arranged at the upper opening of the slot, and a plurality of lower layer coils each of which one and the other coil sides are arranged at the lower opening of the slot, as the armature coil,
When N is a natural number of 2 or more, the number of slots per pole q ′, which is the number of slots per one magnetic pole, satisfies the relationship N <q ′ <N + 1,
The coil ends of the base coils straddle N + 1 magnetic pole teeth in a state of being inclined in the same direction with respect to the circumferential direction of the armature core,
The coil ends of the upper coil and the lower coil straddle the N magnetic teeth,
The coil sides of a plurality of virtual base coils having the same configuration as the base coil are arranged in all the upper and lower openings of the slots, and the upper openings of the two slots sandwiching the N magnetic teeth. The two virtual base coils having a relationship in which the currents flowing in the two coil sides arranged in opposite directions are in phase and opposite directions are set as virtual specific coils, and the virtual base coil sandwiched between the two virtual specific coils is virtual Assuming a virtual base coil mounting state in which the virtual coil pair composed of the two virtual specific coils and the virtual adjustment coil appear at regular intervals in the circumferential direction of the armature core as the adjustment coil,
Each of the base coils is arranged avoiding the respective positions of all the virtual specific coils and all the virtual adjustment coils,
The coil sides of each of the upper layer coils and the lower layer coils are arranged at positions of the coil sides of the virtual specific coils,
Of each of the slots, the slot sandwiched between one and other coil sides of each upper coil and the slot sandwiched between one and other coil sides of each lower coil are In addition to the mouth and lower mouth, it is a deep groove type slot where the bottom mouth exists,
The armature coil group further includes, as the armature coil, a plurality of lowermost coils in which one and the other coil sides are arranged at the lowermost opening of the deep groove type slot,
The coil end of the lowermost layer coil is arranged to avoid the magnetic pole teeth where none of the upper layer coil, the lower layer coil and the base coil straddles,
The rotating electrical machine in which the number of the magnetic teeth that the coil ends of the lowermost layer coils are the same in each lowermost layer coil.
The armature core is divided into a plurality of divided cores arranged in the circumferential direction of the armature core,
2. The rotating electrical machine according to claim 1, wherein a position of a boundary between each of the divided cores is a position of the magnetic pole teeth where none of the armature coils extends.
The number of the deep groove type slots sandwiched between the common upper layer coils and the number of the deep groove type slots sandwiched between the common lower layer coils are plural, respectively.
Among the different deep groove type slots sandwiched between the common upper layer coils, the position of the lowermost opening of one of the deep groove type slots and the position of the lowermost opening of the other deep groove type slot are the armature Different from each other in the radial direction of the core,
Of the different deep groove-type slots sandwiched between the common lower layer coils, the position of the lowermost opening of one of the deep groove-type slots and the position of the lowermost opening of the other deep groove-type slot are the armature The rotating electrical machine according to claim 1 or 2, wherein the radial directions of the core are different from each other.