JPWO2019008848A1 - Rotating electric machine and direct acting motor - Google Patents

Abstract

A rotating electrical machine capable of reducing torque ripple is obtained. The number of turns of the coil attached to the first tooth is different from the number of turns of the plurality of phase coils attached to the second tooth, and is different from the number of turns of the plurality of phase coils attached to the third tooth. The number of turns of the coil attached to the teeth is the largest for each of the number of turns of the coil attached to each of the other teeth, and at least of the number of turns of the coil attached to the second tooth and the third tooth. One is the minimum for each number of turns of the coil attached to each other tooth.

Description

  The present invention relates to a rotating electric machine and a direct acting motor in which coils are attached to teeth.

  Conventionally, when the number of poles of the rotor is P, the number of slots of the stator is N, and the natural number is n, P = 2n, N = 2n ± 1, or P = 2n, N = 2 (n ± 1), and further, by setting N so as not to be an integral multiple of the number of phases m, a rotating electrical machine is known that reduces the cogging torque generated by increasing the least common multiple of P and N. (For example, refer to Patent Document 1).

Japanese Patent Laid-Open No. 04-208039

  However, since the inductance of each phase is different from each other, there is a problem that a difference occurs in the armature reaction and torque ripple occurs.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a rotating electrical machine and a direct acting motor that can reduce torque ripple.

  A rotating electrical machine according to the present invention includes a stator and a rotor that is rotatably provided to face the stator, and the rotor is a natural number multiple of 2 arranged in a circumferential direction that is a rotation direction. And the stator is attached to the teeth, including a core back and a stator core including N teeth that are integers arranged in the circumferential direction extending radially from the core back. N / C = P / C ± 1, where N / C is 3, where C is the greatest common divisor of P and N. There is a non-multiple relationship, and N teeth include a tooth to which a coil of only one phase is attached and a tooth to which a coil of a plurality of phases is attached, and a tooth to which a coil of only one phase is attached. And the adjacent teeth are in phase The first tooth is a tooth with a plurality of coils including a coil, and the second tooth is a tooth adjacent to one side in the circumferential direction of the first tooth and having a plurality of coils attached. In the case where the teeth adjacent to the other side in the circumferential direction and attached with the coils of a plurality of phases are the third teeth, the number of turns of the coils attached to the first teeth is the plurality of coils attached to the second teeth. Unlike the total number of turns of the coil and the total number of turns of the plurality of coils attached to the third tooth, the number of turns of the coil attached to the first tooth is the number of turns of the coil attached to each of the other teeth. At least out of the total number of turns of the coils attached to the second tooth and the third tooth, with respect to each of the totals. One is the minimum for each of the total number of turns of the coil attached to each of the other teeth, or the number of turns of the coil attached to the first tooth is the number of turns of the coil attached to each of the other teeth. And the total number of turns of the coils attached to the second and third teeth is at least one of the total number of turns of the coils attached to the other teeth. Maximum for each.

  According to the rotating electrical machine according to the present invention, the difference in inductance between the phases can be reduced, so that torque ripple can be reduced.

It is sectional drawing which shows the rotary electric machine which concerns on Embodiment 1 of this invention. It is a figure which shows the number of turns of the coil attached to each tooth | gear of FIG. It is a figure which shows the deviation | shift amount from the average value about the square sum of the number of turns of each phase of the coil attached to each tooth | gear of FIG. It is a graph which shows the relationship between the deviation | shift amount from the average value about the square sum of the number of turns, and an inductance. It is sectional drawing which shows the stator for comparing with the stator of FIG. It is a graph which shows the torque waveform which generate | occur | produces in the rotary electric machine of FIG. It is sectional drawing which shows the modification of the rotary electric machine of FIG. It is a figure which shows the number of turns of the coil attached to each teeth of FIG. It is a figure which shows the deviation | shift amount from the average value about the square sum of the number of turns of each phase of the coil attached to each tooth | gear of FIG. It is a figure which shows arrangement | positioning of the coil of the stator of the rotary electric machine which concerns on Embodiment 2 of this invention. It is a figure which shows the number of turns of the coil attached to each teeth of FIG. It is a figure which shows the deviation | shift amount from the average value about the square sum of the number of turns of each phase of the coil attached to each tooth | gear of FIG. It is a graph which shows the relationship between the deviation | shift amount from the average value about the square sum of the number of turns, and an inductance. It is a graph which shows the torque waveform which generate | occur | produces in the rotary electric machine of FIG. It is sectional drawing which shows the stator of the rotary electric machine which concerns on Embodiment 3 of this invention. FIG. 16 is a cross-sectional view illustrating a modification of the stator in FIG. 15. It is sectional drawing which shows the stator of the rotary electric machine which concerns on Embodiment 4 of this invention. It is sectional drawing which shows the modification of the stator of FIG. FIG. 10 is a cross-sectional view showing a modification of the stator of the rotating electrical machine according to the fourth embodiment. FIG. 20 is a cross-sectional view showing a modification of the stator in FIG. 19. It is a figure which shows the principal part of the stator of the rotary electric machine which concerns on Embodiment 5 of this invention. It is a figure which shows the other principal part of the stator of FIG. It is a perspective view which shows the modification of the stator of FIG. It is a figure explaining the connection of the coil in the stator of the rotary electric machine which concerns on Embodiment 6 of this invention. It is a figure explaining the modification of the connection of the coil of the stator of FIG. It is sectional drawing which shows the direct acting motor which concerns on Embodiment 7 of this invention. It is sectional drawing which shows the modification of the linear motion motor of FIG. It is sectional drawing which shows the direct acting motor which concerns on Embodiment 8 of this invention.

  Hereinafter, a rotating electrical machine according to each embodiment of the present invention will be described with reference to the drawings. In each embodiment, the same or equivalent members and parts will be described with the same reference numerals. In addition, this invention is not limited to the following description, In the range which does not deviate from the summary of this invention, it can deform | transform suitably.

Embodiment 1 FIG.
1 is a cross-sectional view showing a rotary electric machine according to Embodiment 1 of the present invention. A rotating electrical machine according to Embodiment 1 of the present invention includes a stator 1 and a rotor 2 that is provided to face the stator 1 in a radial direction and is rotatable. In this example, the rotor 2 is disposed radially inward with respect to the stator 1.

  The rotor 2 includes a shaft 21, a rotor core 22 fixed to the shaft 21, and six permanent magnets 23 fixed to the rotor core 22 and arranged in the circumferential direction that is the rotation direction. ing. The rotor core 22 is configured by laminating a plurality of magnetic core sheets such as electromagnetic steel sheets. The rotor core 22 is formed in a cylindrical shape. The permanent magnet 23 is disposed on the outer peripheral surface of the rotor core 22. The six permanent magnets 23 are arranged side by side in the circumferential direction.

  The stator 1 includes a stator core 11 and a plurality of coils 12 attached to the stator core 11. The stator core 11 is configured by laminating a plurality of magnetic core sheets such as electromagnetic steel sheets. The stator core 11 has an annular core back 111 and seven teeth 112 extending radially inward from the core back 111. The seven teeth 112 are arranged side by side in the circumferential direction. Slots 113 are formed between teeth 112 adjacent in the circumferential direction. The coil 12 is disposed in the slot 113. The coil 12 is configured by winding a conductive wire around the tooth 112 in a concentrated manner.

  A voltage is applied to the stator 1 from a three-phase AC power source (not shown). Assuming that the number of poles, which is the number of magnetic poles of the rotor 2, is P, which is a natural number multiple of 2, the number of poles P is 6, the number of slots N of the stator 1 is 7, and the number of poles P and the number of slots The greatest common divisor C of N is 1. In this case, the number of slots N / the greatest common divisor C = the number of poles P / the greatest common divisor C ± 1, and N / C is not a multiple of the number of phases 3. With such a configuration, an effect that the cogging torque can be reduced can be obtained.

  In such a rotating electric machine, when the number of turns of each coil 12 is designed to be equal, as in the rotating electric machine in which the number of slots N / the greatest common divisor C is a multiple of the phase number 3, an unbalance occurs in the armature reaction. Torque ripple occurs.

  In FIG. 1, a tooth number is assigned to each tooth 112 for convenience. Specifically, in FIG. 1, tooth numbers 1 to 7 are assigned to each tooth 112 in the clockwise direction. Each of the seven teeth 112 includes a + U-phase coil 12, a -U-phase and + V-phase coil 12, a -V-phase coil 12, and a + V-phase coil clockwise from the first tooth 112. 12, a + W-phase coil 12, a -W-phase coil 12, and a -U-phase and + W-phase coil 12 are attached in this order. Here, the symbols “+” and “−” in each phase of the coil 12 attached to each tooth 112 indicate the direction of magnetic flux generated when a current flows through the coil 12.

  The first tooth 112 is provided with the coil 12 having only one phase, and the second tooth 112 and the seventh tooth 112 adjacent to the first tooth 112 are provided in the first tooth 112. A plurality of phase coils 12 including the same phase coil 12 as the coil 12 are attached. A tooth 112 to which a coil 12 of only one phase is attached, and a tooth 112 to which a plurality of phase coils 12 including a coil 12 of the same phase are attached to a tooth 112 adjacent to the tooth 112 is referred to as a first tooth 112a. To do. Further, the tooth 112 adjacent to one side in the circumferential direction of the first tooth 112a and to which the coils 12 of a plurality of phases are attached is defined as a second tooth 112b, adjacent to the other side in the circumferential direction of the first tooth 112a, and a plurality of phases The tooth 112 to which the coil 12 is attached is referred to as a third tooth 112c. In FIG. 1, the first tooth 112 is the first tooth 112a, the second tooth 112 is the second tooth 112b, and the seventh tooth 112 is the third tooth 112c. In Embodiment 1 of the present invention, a plurality of phase coils 12 are attached only to the second teeth 112b and the third teeth 112c.

  FIG. 2 is a diagram showing the number of turns of the coil 12 attached to each tooth 112 in FIG. In FIG. 2, the number of turns of the coil 12 attached to each tooth 112 is standardized based on the number of turns of the coil 12 attached to the first tooth 112a. As shown in FIG. 2, the number of turns of the coil 12 attached to the first tooth 112a is different from the total number of turns of the coils 12 of the plurality of phases attached to the second tooth 112b, and attached to the third tooth 112c. It differs from the total number of turns of each coil 12 of the plurality of phases.

  Further, the number of turns of the coil 12 attached to the first tooth 112a is the maximum with respect to the total number of turns of the coil 12 attached to each of the six teeth 112 other than the first tooth 112a. The number of turns of the coil 12 attached to the second tooth 112b and the third tooth 112c is the number of turns of the coil 12 attached to each of the five teeth 112 other than the second tooth 112b and the third tooth 112c. Is the minimum with respect to the sum of

  By making the number of turns as shown in FIG. 2, the difference in inductance of each phase can be reduced, and torque ripple, in particular, a period of electrical angle of 180 °, that is, a secondary pulsation component of electrical angle can be reduced. Further, since the winding coefficient can be increased, the induced voltage is increased, and an effect that high torque can be obtained is obtained.

  Moreover, since the difference in the total number of turns of the coil 12 between the phases can be reduced, the difference in phase resistance between the phases can be reduced. Moreover, since the difference in the number of turns of the coil 12 attached to each tooth 112 can be reduced, local heat generation in the stator core 11 can be suppressed.

  In Embodiment 1 of this invention, all the coils 12 are comprised from the conducting wire of the same wire diameter. For this reason, the time required for manufacturing the stator 1 can be shortened, and the manufacturability of the stator 1 can be improved.

i is a natural number from 1 to 7, the number of turns of the U-phase coil 12 attached to the i-th tooth 112 is N _ui , the number of turns of the V-phase coil 12 attached to the i-th tooth 112 is N _vi , The number of turns of the W-phase coil 12 attached to the i-th tooth 112 is N _wi . The average value of the sum of squares ΣN _ui ² of the number of turns of the U-phase coil 12, the sum of squares ΣN _vi ² of the number of turns of the V-phase coil 12 and the sum of squares ΣN _wi ² of the number of turns of the W-phase coil 12 .

  FIG. 3 is a diagram showing a deviation amount from the average value of the square sum of the number of turns of each phase of the coil 12 attached to each tooth 112 of FIG. 1, and FIG. 4 is a deviation amount from the average value of the square sum of the number of turns. It is a graph which shows the relationship with an inductance. In FIG. 4, the horizontal axis indicates the maximum absolute value of the deviation from the average value for the sum of squares of the number of turns, and the vertical axis indicates the deviation from 1 in the ratio between the maximum value and the minimum value of the three-phase inductance. Indicates the amount.

  Usually, for example, in a rotating electrical machine having 10 poles P, 12 slots N, and 3 phases, and the greatest common divisor C of the pole number P and the slot number N is 2, the slot number N / the greatest common divisor C is 6, which is a multiple of 3 phases. For this reason, the number of teeth of each phase is four and equal to each other. Therefore, the coils 12 having the same number of turns can be attached to each tooth 112, and the inductance of each phase becomes equal. As a result, the ratio between the maximum value and the minimum value of the inductance is 1, and the deviation amount from 1 regarding the ratio between the maximum value and the minimum value of the inductance is 0.

  FIG. 5 is a cross-sectional view showing the stator 1 for comparison with the stator 1 of FIG. In FIG. 5, only one phase coil 12 is attached to each of the seven teeth 112, and the number of turns of all the coils 12 is equal. The broken line in FIG. 4 indicates 1 for the ratio between the maximum value and the minimum value of the inductance when only one phase coil 12 is attached to each of the seven teeth 112 and the number of turns of all the coils 12 is equal. The amount of deviation from is shown. 4 is a ratio between the maximum value and the minimum value of the inductance when only one phase coil 12 is attached to each of the seven teeth 112 and the number of turns of all the coils 12 is equal. The amount of deviation from 1 with respect to 1 is halved.

  When the deviation amount from the average value a of the square sum of the number of turns of the coil 12 of each phase is 24% or less, the deviation amount from 1 with respect to the ratio between the maximum value and the minimum value of the inductance is different for each tooth 112. When the only one-phase coil 12 is attached, the amount of deviation from 1 is not more than the ratio of the maximum value and the minimum value of the inductance. Furthermore, when the deviation from the average value a of the square sum of the number of turns of the coil 12 of each phase is 12% or less, the torque ripple is compared with the case where only the one-phase coil 12 is attached to each tooth 112. And less than half. When the number of turns of the coil 12 attached to each tooth 112 is as shown in FIG. 2, the amount of deviation from 1 regarding the maximum value, the minimum value, and the ratio of the inductance is equal to the number of turns of all the coils 12. The ratio of the maximum value to the minimum value of the inductance in the case of

  FIG. 6 is a graph showing a torque waveform generated in the rotating electrical machine of FIG. The solid line in FIG. 6 shows the torque waveform when the number of turns of the coil 12 attached to each tooth 112 is as shown in FIG. The broken line in FIG. 6 shows the torque waveform when the number of turns of all the coils 12 is equal. In FIG. 6, the vertical axis indicates the torque normalized by the average torque. As shown in FIG. 6, since the ratio of the maximum value and the minimum value of the inductance approaches 1 by setting the number of turns of the coil 12 as shown in FIG. 2, torque ripple during driving, particularly an electrical angle of 180 The period, that is, the pulsating component of the electrical angle secondary can be reduced.

  In the first embodiment, the configuration in which the number of turns of the coil 12 attached to each tooth 112 is as shown in FIG. 2 has been described. However, the number of turns of the coil 12 attached to the first tooth 112a is different from that of other teeth. The maximum number of turns in each of the coils 12 attached to the coil 112, and the number of turns of each of the coils 12 attached to the second tooth 112b and the third tooth 112c corresponds to each of the coils 12 attached to the other teeth 112. The configuration that is the minimum with respect to the total number of turns, or the number of turns of the coil 12 attached to the first tooth 112a is the minimum with respect to the total number of turns in the coil 12 attached to the other teeth 112, and the second tooth 112b and third teeth 112c If configuration respective number of turns of the coil 12 to be kicked is maximized for the total of each of the turns of the coil 12 attached to the other teeth 112, the same effect can be a combination of different number of turns is obtained.

  In the first embodiment, the configuration in which the permanent magnet 23 is attached to the surface of the rotor core 22 has been described. However, the permanent magnet 23 may be embedded in the rotor core 22.

  In the first embodiment, the configuration is described in which the number of poles P is 6, the number of slots N is 7, and the number of phases is 3. However, the configuration is not limited to this, and the number of poles P and the number of slots N are other numbers. It may be. 7 is a cross-sectional view showing a modification of the rotating electrical machine of FIG. 1, FIG. 8 is a diagram showing the number of turns of the coil 12 attached to each tooth 112 in FIG. 7, and FIG. 9 is a coil 12 attached to each tooth 112 in FIG. It is a figure which shows the deviation | shift amount from the average value about the square sum of the winding number of each phase. In FIG. 8, the number of turns of the coil 12 attached to each tooth 112 is standardized based on the number of turns of the coil 12 attached to the first tooth 112a. Thus, the same effect can be obtained even when the number of slots is N. Although the number of turns of the coil 12 attached to each tooth 112 is shown in FIG. 8, the number of turns of the coil 12 attached to the first tooth 112 a is the maximum with respect to the total number of turns of each coil 12 attached to the other teeth 112. In addition, a configuration in which the total number of turns of the coil 12 attached to the second tooth 112b and the third tooth 112c is the minimum with respect to each of the turns of the coil 12 attached to the other teeth 112, or the first tooth 112a. The number of turns of the coil 12 attached to the second tooth 112b is the minimum with respect to the total number of turns of the coil 12 attached to the other teeth 112, and the total number of turns of the coil 12 attached to the second tooth 112b and the third tooth 112c. Attached to other teeth 112 If a configuration which is the maximum for each of the total number of turns of the coil 12 that, similar effects can be a combination of different number of turns is obtained.

  As described above, according to the rotating electrical machine according to the first embodiment of the present invention, torque ripple, in particular, an electrical angle 180 ° period, that is, a secondary pulsation component of an electrical angle can be reduced.

  In addition, according to this rotating electrical machine, the difference in inductance for each phase can be reduced, so that torque ripple, in particular, an electrical angle period of 180 °, that is, a secondary pulsation component of an electrical angle can be reduced.

  Moreover, since the wire diameter of the conducting wire of all the coils 12 is the same, the time concerning manufacture can be shortened and manufacturability can be improved.

  In the first embodiment, the rotating electrical machine has been described in which the number of poles P is 6, the number of slots N is 7, the number of poles P, and the greatest common divisor C of the number of slots N is 1. However, based on this unit, Even if the greatest common divisor C is a natural number other than 1, such as 2, 3, the same effect can be obtained. When the greatest common divisor C is 2, for example, P = 12, N = 14, and when the greatest common divisor C is 3, for example, P = 18, N = 21.

  In the first embodiment, the rotating electrical machine having the number of poles P of 6 has been described. However, the present invention is not limited to this, and the number of poles P is an even number such as 2, 4, 6, 8, or in other words, a natural number of 2. It may be a double number. Similarly, the number of slots N may be a natural number such as 4, 5, 7, 8, 10, and the like so long as the number of slots N / the greatest common divisor C is not a multiple of the number of phases 3. Even in this case, the same effect can be obtained.

Embodiment 2. FIG.
FIG. 10 is a diagram showing the arrangement of the coils of the stator of the rotating electrical machine according to the second embodiment of the present invention. In FIG. 10, a tooth number is assigned to each tooth 112 for convenience. Specifically, in FIG. 10, tooth numbers 1 to 7 are assigned to each tooth 112 in the clockwise direction. Each of the seven teeth 112 is clockwise from the first tooth 112, the + U phase coil 12, the −U phase and + V phase coil 12, the + U phase and −V phase coil 12, A W-phase and + V-phase coil 12, a -V-phase and a + W-phase coil 12, a + U-phase and a -W-phase coil 12, and a -U-phase and a + W-phase coil 12 are attached in this order. Here, the symbols “+” and “−” in each phase of the coil 12 attached to each tooth 112 indicate the direction of magnetic flux generated when a current flows through the coil 12.

  The first tooth 112 is provided with the coil 12 having only one phase, and the second tooth 112 and the seventh tooth 112 adjacent to the first tooth 112 are provided in the first tooth 112. A plurality of phase coils 12 including the same phase coil 12 as the coil 12 are attached. A tooth 112 to which a coil 12 of only one phase is attached, and a tooth 112 to which a plurality of phase coils 12 including a coil 12 of the same phase are attached to a tooth 112 adjacent to the tooth 112 is referred to as a first tooth 112a. To do. Further, the tooth 112 adjacent to one side in the circumferential direction of the first tooth 112a and to which the plurality of phase coils 12 are attached is referred to as a second tooth 112b, adjacent to the other side in the circumferential direction of the first tooth 112a, and a plurality of phases The tooth 112 to which the coil 12 is attached is referred to as a third tooth 112c. In FIG. 1, the first tooth 112 is the first tooth 112a, the second tooth 112 is the second tooth 112b, and the seventh tooth 112 is the third tooth 112c. In the second embodiment of the present invention, only the first-phase coil 112 is attached to the first tooth 112 a, and the plurality of phases of the coils 12 are attached to the other teeth 112.

  FIG. 11 is a diagram showing the number of turns of the coil 12 attached to each tooth 112 in FIG. In FIG. 11, the number of turns of the coil 12 attached to each tooth 112 is standardized based on the number of turns of the coil 12 attached to the first tooth 112a. As shown in FIG. 11, the number of turns of the coil 12 attached to the first tooth 112a is different from the total number of turns of the plurality of coils 12 attached to the second tooth 112b, and the plurality of coils attached to the third tooth 112c. It differs from the total number of 12 turns.

  Further, the number of turns of the coil 12 attached to the first tooth 112a is the minimum with respect to each of the total number of turns of the coil 12 attached to each of the six teeth 112 other than the first tooth 112a. The total number of turns of the coil 12 attached to the second tooth 112b and the third tooth 112c is the number of turns of the coil 12 attached to each of the five teeth 112 other than the second tooth 112b and the third tooth 112c. Is the maximum for each of the sums.

  By making the number of turns as shown in FIG. 11, the inductance of each phase can be made equal to each other, and the torque ripple, in particular, the period of the electrical angle of 180 °, that is, the secondary pulsation component of the electrical angle can be reduced.

  Moreover, since the difference in the total number of turns of the coil 12 between the phases can be reduced, the difference in phase resistance between the phases can be reduced. Moreover, since the difference in the number of turns of the coil 12 attached to each tooth 112 can be reduced, local heat generation in the stator core 11 can be suppressed.

i is a natural number from 1 to 7, the number of turns of the U-phase coil 12 attached to the i-th tooth 112 is N _ui , the number of turns of the V-phase coil 12 attached to the i-th tooth 112 is N _vi , The number of turns of the W-phase coil 12 attached to the i-th tooth 112 is N _wi . The average value of the sum of squares ΣN _ui ² of the number of turns of the U-phase coil 12, the sum of squares ΣN _vi ² of the number of turns of the V-phase coil 12 and the sum of squares ΣN _wi ² of the number of turns of the W-phase coil 12 .

  FIG. 12 is a diagram showing a deviation amount from the average value for the square sum of the number of turns of each phase of the coil 12 attached to each tooth 112 of FIG. 10, and FIG. 13 is a deviation amount from the average value for the square sum of the number of turns. It is a graph which shows the relationship with an inductance. In FIG. 13, the horizontal axis indicates the maximum absolute value of the deviation from the average value for the sum of squares of the number of turns, and the vertical axis indicates the deviation from 1 in the ratio between the maximum value and the minimum value of the three-phase inductance. Indicates the amount.

  Usually, for example, in a rotating electrical machine having 10 poles P, 12 slots N, 2 poles P and the greatest common divisor C of the slots N, and 3 phases, the slot number N / the greatest common divisor C is 6, which is a multiple of 3 phases. For this reason, the number of teeth of each phase is four and equal to each other. Therefore, the coils 12 having the same number of turns can be attached to each tooth 112, and the inductance of each phase becomes equal. As a result, the ratio between the maximum value and the minimum value of the inductance is 1, and the deviation amount from 1 regarding the ratio between the maximum value and the minimum value of the inductance is 0.

  The broken line in FIG. 13 indicates 1 for the ratio between the maximum value and the minimum value of the inductance when only one phase coil 12 is attached to each of the seven teeth 112 and the number of turns of all the coils 12 is equal. The amount of deviation from is shown. The one-dot chain line in FIG. 13 indicates the ratio between the maximum value and the minimum value of the inductance when only one phase coil 12 is attached to each of the seven teeth 112 and the number of turns of all the coils 12 is equal. The amount of deviation from 1 with respect to 1 is halved.

  When the amount of deviation from the mean value a of the sum of squares of the number of turns of the coil 12 of each phase is 15% or less, the amount of deviation from 1 with respect to the ratio between the maximum value and the minimum value of the inductance is When the only one-phase coil 12 is attached, the amount of deviation from 1 is not more than the ratio of the maximum value and the minimum value of the inductance. Furthermore, when the deviation from the average value a of the square sum of the number of turns of the coil 12 of each phase is 7.5% or less, the torque ripple is the case where only the one-phase coil 12 is attached to each tooth 112. In comparison, it can be made half or less. When the number of turns of the coil 12 attached to each tooth 112 is as shown in FIG. 11, the deviation amount from 1 regarding the ratio between the maximum value and the minimum value of the inductance is the number of turns of all the coils 12. In the case of equality, the ratio of the maximum value to the minimum value of the inductance is less than half of the deviation from 1.

  FIG. 14 is a graph showing a torque waveform generated in the rotating electrical machine of FIG. The solid line in FIG. 14 shows the torque waveform when the number of turns of the coil 12 attached to each tooth 112 is as shown in FIG. The broken line in FIG. 14 shows the torque waveform when the number of turns of all the coils 12 is equal. In FIG. 14, the vertical axis represents the torque normalized by the average torque. As shown in FIG. 14, by setting the number of turns of the coil 12 as shown in FIG. 11, the ratio between the maximum value and the minimum value of the inductance approaches 1, so that the torque ripple during driving, particularly the electrical angle 180 The period, that is, the pulsating component of the electrical angle secondary can be reduced.

  In the second embodiment, the configuration in which the number of turns of the coil 12 attached to each tooth 112 is as shown in FIG. 11 is described. However, the number of turns of the coil 12 attached to the first tooth 112a is different from that of other teeth. The maximum number of turns of the coil 12 attached to the 112 and the total number of turns of the coil 12 attached to the second tooth 112b and the third tooth 112c of each of the coils 12 attached to the other teeth 112. A configuration that is the smallest with respect to each of the total number of turns, or the number of turns of the coil 12 attached to the first tooth 112a is the smallest with respect to each of the total number of turns of the coil 12 attached to the other teeth 112, and the first It is attached to 2 teeth 112b and 3rd teeth 112c If each of the total number of turns of yl 12 a is a maximum configuration with respect to each of the turns total coil 12 attached to the other teeth 112, the same effect can be a combination of different number of turns is obtained.

  In the second embodiment, the configuration in which the slot number N is 7 and the number of phases is 3 has been described. However, the present invention is not limited to this, and the slot number N may be other numbers.

  As described above, according to the rotating electrical machine according to the second embodiment of the present invention, torque ripple, in particular, an electrical angle 180 ° period, that is, a secondary pulsation component of an electrical angle can be reduced.

  In addition, according to this rotating electrical machine, the difference in inductance for each phase can be reduced, so that torque ripple, in particular, an electrical angle period of 180 °, that is, a secondary pulsation component of an electrical angle can be reduced.

  In the second embodiment, the rotating electrical machine has been described in which the number of poles P is 6, the number of slots N is 7, the number P of poles and the greatest common divisor C of the number of slots N are 1. However, based on this unit, Even if the greatest common divisor C is a natural number other than 1, such as 2, 3, the same effect can be obtained. When the greatest common divisor C is 2, for example, P = 12, N = 14, and when the greatest common divisor C is 3, for example, P = 18, N = 21.

  In the second embodiment, the rotating electrical machine having the number of poles P of 6 has been described. However, the present invention is not limited to this, and the number of poles P is an even number such as 2, 4, 6, 8, or the like, in other words, a natural number of 2. It may be a double number. Similarly, the number of slots N may be a natural number such as 4, 5, 7, 8, 10, and the like so long as the number of slots N / the greatest common divisor C is not a multiple of the number of phases 3. Even in this case, the same effect can be obtained.

Embodiment 3 FIG.
15 is a cross-sectional view showing a stator of a rotary electric machine according to Embodiment 3 of the present invention, and FIG. 16 is a cross-sectional view showing a modification of the stator of FIG. In FIG. 15, a plurality of phase coils 12 are attached only to the second teeth 112b and the third teeth 112c as in the first embodiment. In FIG. 16, the one-phase coil 12 is attached only to the first tooth 112 a as in the second embodiment.

  In the rotating electrical machine according to Embodiment 3 of the present invention, the wire diameters of the conductive wires constituting coil 12 are different from each other in accordance with the total number of turns per tooth. Specifically, a coil 12 made of a conducting wire having a relatively large wire diameter is attached to the tooth 112 having a relatively small number of turns per tooth. On the other hand, a coil 12 made of a conductive wire having a relatively small wire diameter is attached to a tooth 112 having a relatively large number of turns per tooth. Other configurations are the same as those in the first or second embodiment.

  The electrical resistance of the coil 12 is inversely proportional to the square of the wire diameter. Therefore, the smaller the wire diameter of the conducting wire, the greater the electrical resistance of the coil 12, and the larger the wire diameter of the conducting wire, the smaller the electrical resistance of the coil 12. The electrical resistance of the coil 12 is proportional to the wire length of the coil 12, that is, the number of turns. Accordingly, the electrical resistance of the coil 12 increases as the number of turns increases, and the electrical resistance of the coil 12 decreases as the number of turns decreases. Thus, the difference in the electrical resistance for each tooth 112 can be reduced by selecting the wire diameter of the conducting wire constituting the coil 12 according to the number of turns. Thereby, the difference in the amount of heat generated by the coil can be reduced, and the heat establishment can be improved. Moreover, since the difference in electrical resistance for each phase can be reduced, torque ripple can be further reduced.

  As described above, according to the rotating electric machine according to the third embodiment of the present invention, since the wire diameter of each coil 12 is at least two kinds or more, the electrical resistance of the coil 12 attached to the tooth 112 is reduced. The difference can be reduced, and the difference in the heat generation amount of the coil 12 can be suppressed. As a result, heat establishment can be improved.

Embodiment 4 FIG.
17 is a cross-sectional view showing a stator of a rotating electric machine according to Embodiment 4 of the present invention, and FIG. 18 is a cross-sectional view showing a modification of the stator of FIG. In FIG. 17, a plurality of phase coils 12 are attached only to the second tooth 112b and the third tooth 112c as in the first embodiment. In FIG. 18, the one-phase coil 12 is attached only to the first tooth 112 a as in the second embodiment.

  The plurality of phase coils 12 attached to the same tooth 112 are arranged side by side in the circumferential direction around the teeth 112 to which the plurality of phase coils 12 are attached. Of the plurality of phase coils 12 attached to the same tooth 112, the coil 12 arranged close to the tooth 112 has a large number of turns, and the coil 12 arranged far from the tooth 112 has a small number of turns. It has become. Thereby, in the coil 12 of the several phase attached to the same teeth 112, the wire length of the conducting wire of the coil 12 with a large number of turns can be shortened, and the wire length of the conducting wire of the coil 12 with a small number of turns can be increased. . The electrical resistance of the coil 12 is proportional to the length of the conducting wire of the coil 12. When the center of gravity of the cross section perpendicular to the axial direction of the coil 12 is the center of gravity of the coil cross section, the wire length of the coil 12 depends on the distance between the center of gravity of the coil cross section and the center of the tooth 112. The difference in electrical resistance due to the difference in the total number of turns of the coil 12 for each phase can be reduced. Therefore, when a voltage is applied, the difference in the current value flowing through each phase can be reduced, and the circulating current flowing in the closed circuit can be reduced. As a result, torque ripple can be reduced. Other configurations are the same as those in the first to third embodiments.

  19 is a cross-sectional view showing a modification of the stator of the rotating electrical machine according to the fourth embodiment, and FIG. 20 is a cross-sectional view showing a modification of the stator of FIG. In FIG. 19, the coils 12 of a plurality of phases are attached only to the second tooth 112b and the third tooth 112c as in the first embodiment. In FIG. 20, similarly to the second embodiment, the one-phase coil 12 is attached only to the first tooth 112 a.

  In the coils 12 of a plurality of phases attached to the same tooth 112, the line C connecting the center of gravity A of the coil cross section of one coil 12 and the center B of the stator 1 has the center of gravity D of the coil cross section of the other coil 12. It is divided so as not to pass. Since the wire length of the conducting wire of the coil 12 depends on the distance between the center of gravity of the coil cross section for one phase arranged in the slot 113 and the center of the tooth 112, the center of gravity of the coil cross section is in relation to the tooth 112. The coil 12 arranged in the vicinity has a large number of turns, and the coil 12 arranged with the center of gravity of the coil cross section far from the teeth 112 has a small number of turns. Thereby, in the coil 12 of the several phase attached to the same teeth 112, the wire length of the conducting wire of the coil 12 with a large number of turns can be shortened, and the wire length of the conducting wire of the coil 12 with a small number of turns can be increased. . The electrical resistance of the coil 12 is proportional to the length of the conducting wire of the coil 12. When the center of gravity of the cross section perpendicular to the axial direction of the coil 12 is the center of gravity of the coil cross section, the wire length of the coil 12 depends on the distance between the center of gravity of the coil cross section and the center of the tooth 112. The difference in electrical resistance due to the difference in the total number of turns of the coil 12 for each phase can be reduced. Therefore, when a voltage is applied, the difference in the current value flowing through each phase can be reduced, and the circulating current flowing in the closed circuit can be reduced. As a result, torque ripple can be reduced.

  As described above, according to the rotating electric machine according to the fourth embodiment of the present invention, since the average length of the conducting wire of each coil 12 is at least two or more types, a plurality of phases attached to one tooth 112 are included. The difference in electrical resistance between the coils can be reduced, and the difference in electrical resistance can be suppressed. As a result, torque ripple can be reduced.

Embodiment 5 FIG.
FIG. 21 is a diagram showing a main part of a stator of a rotating electric machine according to Embodiment 5 of the present invention, and FIG. 22 is a diagram showing another main part of the stator of FIG. In FIG. 21, the figure which looked at the principal part of the stator 1 with which the coil 12 with a large total number of turns attached to the teeth 112 was seen toward the radial direction outer side from the center of the stator 1 is shown, and in FIG. The figure which looked at the principal part of the stator 1 with which the small coil 12 is attached to the teeth 112 toward the radial direction outer side from the center of the stator 1 is shown. The stator 1 further includes an insulator 13 attached to the teeth 112. The insulator 13 is made of resin, insulating paper, or the like. The coil 12 is attached to the tooth 112 via the insulator 13. The insulator 13 attached to the tooth 112 to which the coil 12 having a small number of turns is attached has a dimension in the axial direction of the stator 1 with respect to the insulator 13 attached to the tooth 112 to which the coil 12 having a large number of turns is attached. It is getting bigger. The insulator 13 attached to the tooth 112 to which the coil 12 having a small number of turns is attached is configured by attaching a spacer to the same insulator 13 attached to the tooth 112 to which the coil 12 having a large number of turns is attached. ing. The insulator 13 attached to the tooth 112 to which the coil 12 having a small number of turns is attached may be formed by integral molding with a spacer.

  When the insulator 13 attached to the tooth 112 to which the coil 12 having a large total number of turns is attached is attached to the tooth 112 to which the coil 12 having a small total number of turns is attached, Longer than Thereby, the difference in electrical resistance between the coil 12 having a small number of turns and the coil 12 having a large number of turns can be reduced. As a result, the difference in the amount of heat generated for each tooth 112 can be reduced, and the heat establishment can be improved. Other configurations are the same as those in the first to fourth embodiments.

  FIG. 23 is a perspective view showing a modification of the stator of FIG. In FIG. 23, the coil 12 is not shown. FIG. 23 shows a tooth 112 to which a plurality of phase coils 12 are attached. The insulator 13 includes a thin portion 131 provided at a radially inner portion and a thick portion 132 provided at a radially outer portion. The thick portion 132 has a larger axial dimension than the thin portion 131. Thereby, as for the insulator 13, the dimension of an axial direction is larger than the radially inner part of the radially outer part.

  The coil 12 having a small total number of turns is attached to the thick portion 132. A coil 12 having a large total number of turns is attached to the thin portion 131. With such a configuration, the difference in electrical resistance due to the difference in the total number of turns for each phase can be reduced. As a result, torque ripple can be reduced.

  In the above embodiment, the thin portion 131 is provided in the radially inner portion of the insulator and the thick portion 132 is provided in the radially outer portion of the insulator. However, the thin portion 131 is provided in the insulator. The structure provided in the radial direction outer part and the thick part 132 may be provided in the radial direction inner side part in an insulator may be sufficient.

  As described above, according to the rotary electric machine according to the fifth embodiment of the present invention, since the spacer further provided at the end portion in the axial direction of the tooth 112, the difference in the wire length of the conducting wire of the coil 12 is reduced. It can reduce and the difference in the electrical resistance for every phase can be suppressed. As a result, torque ripple can be reduced.

Embodiment 6 FIG.
FIG. 24 is a diagram for explaining the connection of coils in the stator of the rotating electric machine according to the sixth embodiment of the present invention. In FIG. 24, the coils 12 of a plurality of phases are attached only to the second tooth 112b and the third tooth 112c. In FIG. 24, for the convenience of explanation, the plurality of coils 12 of a plurality of phases attached to one tooth 112 are individually arranged in the circumferential direction and assigned the same tooth number.

  As shown in FIG. 24, the U-phase coil 12 is arranged on the seventh tooth 112, the first tooth 112, and the second tooth 112, and the connecting wire provided between the coils 12. 121 are continuously connected in series. The V-phase coil 12 is arranged in the second tooth 112, the third tooth 112, and the fourth tooth 112, and is continuously connected in series by a jumper 121 provided between the coils 12. Has been. The W-phase coil 12 is arranged in the fifth tooth 112, the sixth tooth 112, and the seventh tooth 112, and is continuously connected in series by a jumper 121 provided between the coils 12. Has been. Other configurations are the same as those in the first to fifth embodiments.

  FIG. 25 is a view for explaining a modification of the connection of the stator coil 12 of FIG. In FIG. 25, the one-phase coil 12 is attached only to the first teeth 112a. The U-phase coil 12 is arranged in the sixth tooth 112, the seventh tooth 112, the first tooth 112, the second tooth 112, and the third tooth 112. They are continuously connected in series by a connecting wire 121 provided therebetween. The V-phase coil 12 is arranged on the second tooth 112, the third tooth 112, the fourth tooth 112, and the fifth tooth 112, and a jumper provided between the coils 12. 121 are continuously connected in series. The W-phase coil 12 is arranged on the fourth tooth 112, the fifth tooth 112, the sixth tooth 112, and the seventh tooth 112, and the connecting wire provided between the coils 12. 121 are continuously connected in series.

  The in-phase coils 12 connected to the same series circuit are connected on one side in the axial direction. Thereby, the crossover 121 is not arrange | positioned at the connection side. As a result, the connection work of the coil 12 becomes easy and the workability can be improved. Further, among the coils 12 connected on the same series circuit, the number of turns of the even number of coils 12 can be Nt ± 0.5 (Nt is a natural number). It is possible to improve the degree of freedom of design for reducing the above.

  As described above, according to the rotating electrical machine according to the sixth embodiment of the present invention, the in-phase coils 12 adjacent in the circumferential direction are connected by the jumper wires 121 provided between the coils 12. The work of connecting the coil 12 becomes easy, and the workability can be improved.

  Moreover, since the connecting wire 121 is arrange | positioned at the axial direction one side of the teeth 112, the operation | work which attaches the coil 12 becomes easy, workability can be improved, and the freedom degree of design can be improved. it can.

Embodiment 7 FIG.
FIG. 26 is a sectional view showing a direct acting motor according to Embodiment 7 of the present invention. The direct acting motor according to Embodiment 7 of the present invention is a permanent magnet type linear motor. The linear motor includes a stator 1 and a mover 3 that is provided to face the stator 1 and is movable relative to the stator 1. In this example, the stator 1 is a field and the mover 3 is an armature.

  The stator 1 is disposed so as to extend in the traveling direction of the mover 3. The mover 3 is movable with respect to the stator 1 in the longitudinal direction of the stator 1. The stator 1 includes a stator core 11 and a plurality of permanent magnets 14 provided on the stator core 11. The plurality of permanent magnets 14 are arranged side by side in the longitudinal direction of the stator 1. The mover 3 includes a mover iron core 31 and a plurality of coils 32 attached to the mover iron core 31. In the direct acting motor according to the seventh embodiment, the mover 3 includes the coil 32, and the stator 1 includes the permanent magnet 14. However, the operating principle is the same as that of the rotating electrical machine according to the first embodiment. .

The mover iron core 31 has a core back 311 that extends in the longitudinal direction of the stator 1, and seven teeth 312 that extend from the core back 311 toward the stator 1. The seven teeth 312 are arranged side by side in the longitudinal direction of the stator 1.
It is.

  In FIG. 26, a tooth number is assigned to each tooth 312 for convenience. Specifically, in FIG. 26, teeth numbers 5, 6, 7, 1, 2, 3, 4 are assigned to the teeth 312 from the left end toward the right end. Here, the first tooth 312 is the first tooth 312a, the second tooth 312 is the second tooth 312b, and the seventh tooth 312 is the third tooth 312c. By adopting such a configuration, the mover 3 is magnetically symmetric about the first tooth 312a in the traveling direction, so that an effect that torque ripple can be reduced is obtained. The number of turns of the coil 32 attached to each tooth 312 can reduce the difference in inductance for each phase with reference to FIG. Therefore, it is possible to reduce torque ripple, in particular, electrical angle 180 ° period, that is, electrical angle secondary pulsation. Other configurations are the same as those in the first to sixth embodiments.

  In the seventh embodiment, the configuration in which the number of teeth 312 is seven has been described. However, the present invention is not limited to this, and the number of teeth 312 may be other numbers. FIG. 27 is a cross-sectional view showing a modification of the linear motor shown in FIG. In FIG. 27, the number of teeth 312 is five. In FIG. 27, teeth numbers 4, 5, 1, 2, and 3 are assigned to the teeth 312 from the left end to the right end. Here, the first tooth 312 is the first tooth 312a, the second tooth 312 is the second tooth 312b, and the fifth tooth 312 is the third tooth 312c. With such a configuration, the mover 3 is magnetically symmetric, so that an effect that torque ripple can be reduced can be obtained. The number of turns of the coil 32 attached to each tooth 312 can reduce the difference in inductance for each phase with reference to FIG. Therefore, it is possible to reduce torque ripple, in particular, electrical angle 180 ° period, that is, electrical angle secondary pulsation.

  Further, in the direct acting motor shown in FIGS. 26 and 27, the direct acting motor in which the mover 3 is an armature and the stator 1 is a field has been described. On the other hand, a linear motor may be used in which the mover 3 is a field and the stator 1 is an armature.

Embodiment 8 FIG.
FIG. 28 is a sectional view showing a direct acting motor according to Embodiment 8 of the present invention. The direct acting motor according to the eighth embodiment of the present invention is a permanent magnet type linear motor. The linear motor includes a stator 1 and a mover 3 that is provided facing the stator 1 and is movable with respect to the stator 1. The stator 1 is disposed so as to extend in the traveling direction of the mover 3. The mover 3 is movable relative to the stator 1 in the longitudinal direction of the stator 1. The stator 1 includes a stator core 11 and a plurality of permanent magnets 14 provided on the stator core 11. The plurality of permanent magnets 14 are arranged side by side in the longitudinal direction of the stator 1. The mover 3 includes a mover iron core 31 and a plurality of coils 32 attached to the mover iron core 31. In the direct acting motor according to the seventh embodiment, the mover 3 includes the coil 32, and the stator 1 includes the permanent magnet 14. However, the operating principle is the same as that of the rotating electrical machine according to the first embodiment. .

The mover iron core 31 has a core back 311 that extends in the longitudinal direction of the stator 1, and seven teeth 312 that extend from the core back 311 toward the stator 1. The seven teeth 312 are arranged side by side in the longitudinal direction of the stator 1.
It is.

  In FIG. 28, a tooth number is assigned to each tooth 312 for convenience. Specifically, in FIG. 28, teeth numbers 5, 6, 7, 1, 2, 3, 4 are assigned to the teeth 312 from the left end toward the right end. Here, the first tooth 312 is the first tooth 312a, the second tooth 312 is the second tooth 312b, and the seventh tooth 312 is the third tooth 312c. By adopting such a configuration, the mover 3 is magnetically symmetric about the first tooth 312a in the traveling direction, so that an effect that torque ripple can be reduced is obtained. The number of turns of the coil 32 attached to each tooth 312 can reduce the difference in inductance for each phase with reference to FIG. Therefore, it is possible to reduce torque ripple, in particular, electrical angle 180 ° period, that is, electrical angle secondary pulsation. Other configurations are the same as those in the first to sixth embodiments.

  In the linear motion motor shown in FIG. 28, the linear motion motor in which the mover 3 is an armature and the stator 1 is a field has been described. On the other hand, a linear motor may be used in which the mover 3 is a field and the stator 1 is an armature.

  DESCRIPTION OF SYMBOLS 1 Stator, 2 Rotor, 3 Movable element, 11 Stator iron core, 12 Coil, 13 Insulator, 14 Permanent magnet, 21 Shaft, 22 Rotor iron core, 23 Permanent magnet, 31 Movable iron core, 32 Coil, 111 Core back , 112 teeth, 112a 1st teeth, 112b 2nd teeth, 112c 3rd teeth, 113 slots, 121 crossover, 131 thin part, 132 thick part, 311 core back, 312 teeth, 312a 1st tooth, 312b 2nd Teeth, 312c Third tooth.

Claims (15)

A stator, and a rotor that is rotatably provided facing the stator,
The rotor has P magnetic poles that are a natural number multiple of 2 and are arranged in a circumferential direction that is a rotation direction,
The stator includes a core core and a stator core including N teeth that are integer numbers and are arranged in a circumferential direction extending in a radial direction from the core back, and a coil attached to the teeth.
The teeth are attached to the three-phase coil,
When the greatest common divisor of P and N is C, N / C = P / C ± 1, N / C is not a multiple of 3,
Among the N teeth, there are the teeth to which the coils of only one phase are attached and the teeth to which the coils of a plurality of phases are attached,
The teeth to which the coils of only one phase are attached, and the teeth to which the coils of a plurality of phases including the coils of the same phase are attached to the adjacent teeth are defined as the first teeth. The teeth adjacent to one side in the circumferential direction of one tooth and having the coils of a plurality of phases attached thereto are defined as second teeth, and adjacent to the other side in the circumferential direction of the first teeth and the coils of a plurality of phases are attached. When the above-mentioned teeth are the third teeth,
The number of turns of the coil attached to the first tooth is different from the total number of turns of the plurality of coils attached to the second tooth, and the number of turns of the plurality of coils attached to the third tooth. Unlike the total,
The number of turns of the coil attached to the first tooth is the maximum for each of the total number of turns of the coil attached to each of the other teeth, and the second tooth and the third tooth At least one of the total number of turns of the attached coil is the minimum with respect to each of the total number of turns of the coil attached to each of the other teeth, or attached to the first tooth. The number of turns of the coil is minimum with respect to the total number of turns of the coil attached to each of the other teeth, and the number of turns of the coil attached to the second tooth and the third tooth. At least one of the total is the maximum for each of the total number of turns of the coil attached to each of the other teeth. The rotary electric machine that.   The rotating electrical machine according to claim 1, wherein the coils of a plurality of phases are attached only to the second teeth and the third teeth.   The rotating electrical machine according to claim 1, wherein the coil of only one phase is attached only to the first tooth. Numbers 1 to N are sequentially assigned to the N teeth in the circumferential direction, and attached to the i-th teeth that are integers. When the number of turns is an integer W _ji , the average value a of the sum of squares for each phase is

And the sum of squares b _j of the number of turns of each phase

3. The rotating electrical machine according to claim 2, wherein a maximum value of an absolute value of a deviation amount of the b _j from the a is 24% or less. Numbers 1 to N are sequentially assigned to the N teeth in the circumferential direction, and attached to the i-th teeth that are integers. When the number of turns is an integer W _ji , the average value a of the sum of squares for each phase is

And the sum of squares b _j of the number of turns of each phase

4. The rotating electrical machine according to claim 3, wherein a maximum value of an absolute value of an amount of deviation of the b _j from the a is 15% or less.   The rotating electrical machine according to any one of claims 1 to 5, wherein wire diameters of all the coils are the same.   The rotating electrical machine according to any one of claims 1 to 5, wherein there are at least two types of wire diameters of the conductive wires of the coils.   The rotating electrical machine according to any one of claims 1 to 7, wherein the average length of the conducting wire of each coil is at least two kinds.   The rotating electrical machine according to claim 8, further comprising a spacer provided at an axial end portion of the teeth.   The rotating electrical machine according to any one of claims 1 to 9, wherein the coils having the same phase adjacent in the circumferential direction are connected by a jumper provided between the coils.   The rotating electrical machine according to claim 10, wherein the crossover is disposed on one side in the axial direction of the teeth. A stator, and a rotor that is rotatably provided facing the stator,
The stator includes a core core and a stator core including a plurality of teeth extending in a radial direction from the core back and arranged in a circumferential direction, and a coil attached to the teeth.
Among the plurality of teeth, there are the teeth to which the coils of only one phase are attached and the teeth to which the coils of a plurality of phases are attached,
The teeth to which the coils of only one phase are attached, and the teeth to which the coils of a plurality of phases including the coils of the same phase are attached to the adjacent teeth are defined as the first teeth. The teeth adjacent to one side in the circumferential direction of one tooth and having the coils of a plurality of phases attached thereto are defined as second teeth, and adjacent to the other side in the circumferential direction of the first teeth and the coils of a plurality of phases are attached. When the above-mentioned teeth are the third teeth,
The number of turns of the coil attached to the first tooth is the maximum for each of the total number of turns of the coil attached to each of the other teeth.
The total number of turns of the coil attached to the second tooth and the total number of turns of the coil attached to the third tooth are respectively the total number of turns of the coil attached to each of the other teeth. Rotating electric machine that is the minimum against.   The rotating electrical machine according to claim 12, wherein the number of turns of the coil attached to the first tooth is different from the total number of turns of the coil attached to the second tooth.   The rotating electrical machine according to claim 12 or 13, wherein the number of turns of the coil attached to the first tooth is different from a total number of turns of the coil attached to the third tooth. An armature and a field provided opposite to the armature and moving in a traveling direction relative to the armature;
The armature has an armature core including a plurality of teeth, and a coil attached to the teeth,
Among the plurality of teeth, there are the teeth to which the coils of only one phase are attached and the teeth to which the coils of a plurality of phases are attached,
The teeth to which the coils of only one phase are attached, and the teeth to which the coils of a plurality of phases including the coils of the same phase are attached to the adjacent teeth are defined as the first teeth. The tooth adjacent to one side in the traveling direction of one tooth and having the coils of a plurality of phases attached thereto is defined as a second tooth, and adjacent to the other side in the traveling direction of the first tooth and the coils of a plurality of phases are attached. When the above-mentioned teeth are the third teeth,
The number of turns of the coil attached to the first tooth is the maximum for each of the total number of turns of the coil attached to each of the other teeth.
The total number of turns of the coil attached to the second tooth and the total number of turns of the coil attached to the third tooth are respectively the total number of turns of the coil attached to each of the other teeth. Direct acting motor that is the minimum against.

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