JP2013085381A - Synchronous motor drive system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a synchronous motor drive system capable of suppressing increase in torque pulsation which is caused by variation in current phase control among a plurality of three-phase inverters.SOLUTION: The synchronous motor drive system includes a synchronous motor that contains a rotor which has a plurality of magnetic poles arranged at constant intervals in circumferential direction and a stator containing a plurality of stator teeth 113 arranged at constant intervals in circumferential direction, and a plurality of three-phase inverters which supply a plurality of three-phase alternate currents with phases deviated from each other to the synchronous motor. One or more kinds of sub windings 114Ua and 114Ub or the like are wound in concentrated winding on the stator teeth 113. Each of the sub windings is connected to any one phase of the three-phase inverter. In a pair of stator teeth 113, adjoining each other, two or more kinds of sub windings are wound on at least one stator tooth 113. The sub windings are connected to the three-phase inverters different from each other.

Description

  The present invention relates to a synchronous motor drive system including a synchronous motor and a plurality of three-phase inverters that supply a plurality of three-phase alternating currents that are out of phase with each other to the synchronous motor.

A synchronous motor drive system is incorporated in various devices such as a compressor, an electric vehicle, a hybrid vehicle, and a fuel cell vehicle. As such a synchronous motor drive system, there is a system including a synchronous motor and a plurality of three-phase inverters that supply a plurality of three-phase AC powers that are out of phase with each other to the synchronous motor (for example, Patent Document 1).
FIG. 19 is a diagram showing a basic configuration of a synchronous motor 900 according to Patent Document 1. As shown in FIG. Synchronous motor 900 includes a rotor 901 and a stator 902. The rotor 901 has eight magnetic poles (permanent magnets) 905 arranged at equal intervals in the circumferential direction, and the stator 902 has nine stator teeth 903 arranged at equal intervals in the circumferential direction. Stator windings 904U ₁ , 904V ₁ , 904W ₁ , 904U ₁ ', 904V ₁ ', 904W ₁ ', 904U ₂ , 904V ₂ , 904W ₂ are wound around the stator teeth 903 in a concentrated manner. Yes.

Among the above nine types of stator windings, the six windings of the stator windings 904U ₁ , 904V ₁ , 904W ₁ , 904U ₁ ′, 904V ₁ ′, 904W ₁ ′ are supplied from the first three-phase inverter. Received supply. On the other hand, the three windings of the stator windings 904U ₂ , 904V ₂ , and 904W ₂ are supplied with electric power from a second three-phase inverter different from the first three-phase inverter (see FIG. 1). 13). The first three-phase inverter and the second three-phase inverter output a plurality of three-phase alternating currents that are out of phase with each other.

JP 2010-1105068 A

Such a synchronous motor system is required to have low torque pulsation due to demands for low vibration and low noise. However, as in Patent Document 1, when the windings wound around the adjacent stator teeth are connected to different three-phase inverters, there is a problem that torque pulsation increases.
Several three-phase inverters need to be current-phase controlled so as to maintain a predetermined phase difference between them, and current phase control in the three-phase inverter due to the effects of manufacturing errors and external noise Variations may occur in Then, the influence of this current phase variation appears as a variation in torque acting on each stator tooth. Torque pulsation increases due to this torque variation.

  The present invention has been made in view of the above problems, and an object thereof is to provide a synchronous motor drive system capable of suppressing an increase in torque pulsation due to variations in current phase control between a plurality of three-phase inverters. And

  In order to achieve the above object, a synchronous motor drive system according to the present invention includes a rotor having a plurality of magnetic poles arranged at equal intervals in the circumferential direction and a plurality of stator teeth arranged at equal intervals in the circumferential direction. A synchronous motor drive system comprising: a synchronous motor including a stator; and a plurality of three-phase inverters that supply a plurality of three-phase alternating currents that are out of phase with each other to the synchronous motor. 1 or two or more types of windings are wound in a concentrated winding, and each winding wound around each stator tooth is connected to one of the phases of the plurality of three-phase inverters. In each of the pair of stator teeth that are adjacent to each other, two or more types of windings are wound around at least one stator tooth, and these windings are connected to different three-phase inverters. .

  According to the synchronous motor drive system of the present invention, each stator tooth has one or more types of windings, and the electrical angle phase difference between adjacent stator teeth is equal between the stator teeth. So that it is wound in a concentrated volume. At this time, in the present invention, when viewed with a pair of adjacent stator teeth, at least one of the stator teeth is wound with two or more types of windings, and these windings are mutually connected. They are connected to different three-phase inverters. By adopting such a configuration, even when the current phase in one of the plurality of three-phase inverters deviates by α from the ideal phase, two or more types of windings are fixed. The influence on the phase of the magnetic field generated in the child teeth is not α itself, but is somewhat reduced from α depending on the turn ratio of two or more types of windings. Therefore, since there is no portion where the influence of the variation in the current phase control appears, the torque pulsation can be reduced as compared with the conventional case.

  As described above, according to the present invention, it is possible to provide a synchronous motor drive system capable of suppressing an increase in torque pulsation due to variations in current phase control between a plurality of three-phase inverters. .

It is a figure showing the whole synchronous motor drive system 1000 composition concerning a 1st embodiment. It is a figure showing the whole synchronous motor 100 composition concerning a 1st embodiment. 1 is a detailed view of a synchronous motor 100 according to a first embodiment. It is a figure which shows arrangement | positioning in the stator 106 of each stator coil | winding 114 which concerns on 1st Embodiment. (A) The figure which shows the result of having simulated the torque change which concerns on the synchronous motor 100 of 1st Embodiment, (b) The figure which shows the result of having simulated the torque change which concerns on the synchronous motor 900 of patent document 1. It is a figure which shows the whole structure of the synchronous motor drive system 2000 which concerns on 2nd Embodiment. It is a figure which shows the whole structure of the synchronous motor 200 which concerns on 2nd Embodiment. It is detail drawing of the synchronous motor 200 which concerns on 2nd Embodiment. It is a figure which shows arrangement | positioning in the stator 206 of each stator coil | winding 214 which concerns on 2nd Embodiment. It is a figure which shows the whole structure of the synchronous motor drive system 3000 which concerns on 3rd Embodiment. It is a figure which shows arrangement | positioning in the stator 106 of each stator winding | winding which concerns on 3rd Embodiment. It is a figure which shows the whole structure of the synchronous motor drive system 4000 which concerns on 4th Embodiment. It is a figure which shows arrangement | positioning in the stator 206 of each stator coil | winding which concerns on 4th Embodiment. It is a table | surface which shows each stator teeth and the stator winding currently wound around it in the case of K = 6 and L = 2. It is a table | surface which shows each stator teeth and the stator winding currently wound around it in the case of K = 6 and L = 3. It is a table | surface which shows each stator teeth and the stator winding currently wound around it in the case of K = 6 and L = 3. It is a table | surface which shows each stator teeth and the stator winding currently wound around it in the case of K = 7 and L = 2. 1 is a diagram illustrating an overall configuration of an inner rotor type synchronous motor 700. FIG. It is a figure which shows the basic composition of the synchronous motor 900 which concerns on patent document 1. FIG.

<< First Embodiment >>
<Configuration>
FIG. 1 is a diagram showing an overall configuration of a synchronous motor drive system 1000 according to the first embodiment.
The synchronous motor drive system 1000 includes a synchronous motor 100, a first three-phase inverter 101 that supplies power to the synchronous motor 100, and a second three-phase inverter 102.

The DC power supply BA is a DC power supply obtained by rectifying a power supply system, or a DC power supply of a battery type (typically a secondary battery such as nickel metal hydride or lithium ion).
The first three-phase inverter 101 and the second three-phase inverter 102 are U-phases in which the DC power supplied from the DC power supply BA is shifted by 120 [°] (2π / 3 [rad] in electrical angle). , V phase, and W phase are converted into three-phase alternating current, and the three-phase alternating current is supplied to the synchronous motor 100. The U-phase output currents U1 and U2 are respectively output from the U-phase arms 103u and 104u, the V-phase output currents V1 and V2 are respectively output from the V-phase arms 103v and 104v, and the W-phase output currents W1 and W2 are respectively Output from the W-phase arms 103w and 104w.

FIG. 2 is a diagram illustrating an overall configuration of the synchronous motor 100 according to the first embodiment, and FIG. 3 is a detailed diagram of the synchronous motor 100.
The synchronous motor 100 includes a rotor 105 and a stator 106.
The rotor 105 includes a rotor core 107 and a plurality of permanent magnets 108. The permanent magnets 108 are arranged on the rotor core 107 at equal intervals in the circumferential direction of the rotor. The magnetic pole 109 constituted by the permanent magnet 108 constitutes a magnetic pole pair in which N poles and S poles are alternately arranged with respect to the stator 106. The magnetic pole pair N pole and S pole have an electrical angle of 2π [rad], and the interval between adjacent magnetic poles is an electrical angle of π [rad]. In the present embodiment, since the rotor 105 has 22 magnetic poles, the electrical angle is 11 times the mechanical angle.

  The distances 110 and 111 between the magnetic poles of the rotor 105 mean the position of the magnetic neutral point between the magnetic pole N and the magnetic pole S which are composed of permanent magnets arranged on the rotor 105. Here, it is mechanically located between the magnets. The inter-magnetic pole 110 is between the magnetic poles that change from the N pole to the S pole in the counterclockwise direction, and the inter-magnetic pole 111 is between the magnetic poles that change from the S pole to the N pole in the counterclockwise direction. The inter-magnetic pole 111 ′ is at the same electrical angle as the inter-magnetic pole 11 but at a different mechanical angle.

The stator 106 has an annular stator yoke 112 and a plurality of stator teeth 113 arranged at equal intervals in the circumferential direction on the stator yoke 112. A stator winding 114 is wound around each stator tooth 113 in a concentrated manner.
Twenty-two magnetic poles 109 of the rotor 105 are arranged at equal intervals in the circumferential direction, and the mechanical angle is 360/22 = 16.4 [°]. On the other hand, 24 stator teeth 113 are arranged at equal intervals in the circumferential direction, and the mechanical angle is 360/24 = 15 [°]. As described above, the stator teeth 113 are arranged at an arrangement interval different from the arrangement interval of the magnetic poles 109, and the magnetic poles 109 and the stator teeth 113 are arranged so as to be shifted by 11/12 per half circumference. The interval between the stator teeth 113 is 11π / 12 [rad], and the electrical angle is 165 [°].

  In the present embodiment, when the number of stator teeth 113 is 6K, the number of magnetic poles 109 is represented by 6K ± 2. Since the synchronous motor 100 has 24 stator teeth 113 and 22 magnetic poles 109, the case of K = 4 is described. By making the number of magnetic poles 109 as described above with respect to the number of stator teeth 113, the magnetic flux of the permanent magnet 108 can be used effectively.

When the stator winding 114 is distinguished by its connection destination, 114U ₁ , 114U ₁ ′, 114V ₁ , 114V ₁ ′, 114W ₁ , 114W ₁ ′, 114U ₂ , 114U ₂ ′, 114V ₂ , 114V _{2 in FIG.} There are 12 types as shown by ', 114W ₂ , 114W ₂ '. Hereinafter, when the stator windings are not distinguished, they are simply referred to as the stator windings 114.
The stator windings 114U ₁ and 114U ₁ ′ are on the U-phase arm 103u of the first three-phase inverter 101, and the stator windings 114V ₁ and 114V ₁ ′ are on the V-phase arm 103v of the first three-phase inverter 101, Stator windings 114W ₁ and 114W ₁ ′ are connected to the W-phase arm 103w of the first three-phase inverter 101, respectively. Similarly, the stator windings 114U ₂ and 114U ₂ ′ are on the U-phase arm 104u of the second three-phase inverter 102, and the stator windings 114V ₂ and 114V ₂ ′ are on the V-phase arm of the second three-phase inverter 102. 104v, the stator windings 114W ₂ and 114W ₂ ′ are connected to the W-phase arm 104w of the second three-phase inverter 102, respectively. Thus, each stator winding is connected to one of the first and second three-phase inverters 101 and 102, respectively.

The phase difference between the output current U1 and the output current U2 shown in FIG. 1 is expressed as L / K × (π using the above K when the number of three-phase inverters included in the synchronous motor drive system 1000 is L. / 3 [rad]). In this embodiment, since K = 4 and L = 2, the phase difference between the output current U1 and the output current U2 is π / 6 [rad]. Accordingly, the stator windings 114U ₁ and 114U ₂ are supplied with electric power whose phases are shifted from each other by π / 6 [rad]. The same is true between the output current V1 and the output current V2 and between the output current W1 and the output current W2.

Further, as shown in FIG. 1, the winding directions of the stator windings 114U ₁ and 114U ₁ ′ are opposite to each other. While the stator winding 114U _2, 114U ₂ output current U1 Both the 'is supplied, for the windings winding directions to each other are opposite, the stator windings 114U ₂ and stator windings 114U ₂ The phase difference of the magnetic field generated by 'is π [rad]. Stator winding 114V ₁ and 114V ₁ have a similar relationship also in ', the stator winding 114W ₁ and 114W _1'. This relationship is the same for the stator winding that receives power supply from the second three-phase inverter 102. Here, although the case where the winding directions of the stator windings 114U ₁ and 114U ₁ ′ are opposite to each other has been shown, instead of this, the winding direction of the stator windings 114U ₁ and 114U ₁ ′ or the like is changed. The connection between the input terminal and the neutral point terminal may be reversed.

If the value obtained by dividing the number of magnetic poles by 2 (that is, the number of pole pairs) is an odd number as in this embodiment, in other words, if K is an even number, the stator teeth at a mechanical angle of 180 [°] are symmetrical. The winding directions of the stator windings wound around are reversed.
Figure 3 is an enlarged view of the stator teeth _{113 1,} 113 2, 113 ₃ around the stator windings 114U ₁ is wound. As in the case of the stator winding 114, when the stator teeth are not distinguished from each other, they are simply described as the stator teeth 113.

The stator tooth 113 ₁ is arranged at a mechanical angle of −15 [°] with respect to the stator tooth 113 ₂ (in electrical angle, a position shifted by −π / 12 [rad] from π [rad]). ing. Furthermore, the stator teeth 113 _3, the position of +15 [°] in mechanical angle with respect to the stator teeth 113 ₂ (in electrical angle, [pi [rad] from further + π / 12 [[rad] ] shifted position) Has been placed.

The present embodiment is characterized in how to wind each stator winding 114. Hereinafter, how to wind each stator winding 114 will be described, including the structure of each stator winding 114.
First, as shown in FIG. 3, the stator windings 114U ₁ is the stator teeth 113 ₁ wound and a sub winding 114U ₁ a which is wound, the sub winding 114U ₁ which is wound stator teeth 113 ₂ wound and b, consist of a sub winding 114U ₁ c which is wound stator teeth 113 ₃ wound. That is, the sub winding 114U _{1 a,} 114U 1 b, 114U ₁ c is, the stator teeth _{113 1,} 113 2, 113 connect to the same _{by 3} to over and are connected in series stator windings 114U ₁ is configured. The other stator windings not shown in FIG. 3 have the same configuration. Each sub-winding constituting each stator winding corresponds to the winding of the present invention.

Further, as shown in FIG. 3, the stator teeth 113 _2, only the stator windings 114U ₁ is wound. On the other hand, the stator teeth 113 _1, the stator winding 114U ₁ and two stator coils of the stator coil 114W ₂ 'are wound, the stator teeth 113 _3, the stator winding Two stator windings 114U ₁ and a stator winding 114U ₂ are wound. Thus, the stator winding 114U ₁ is wound over a plurality of stator teeth 113.

FIG. 4 is a diagram illustrating an arrangement of the stator windings 114 in the stator 106 according to the first embodiment. Each of the plurality of elongated squares in FIG. 4 indicates each stator winding 114. In this embodiment, similarly to the stator windings 114U _1, includes three sub-windings to each stator winding 114. Further, as shown in FIG. 4, the stator winding 114U ₁ except stator winding 114 is also wound over a plurality of stator teeth 113 similarly to the stator windings 114U _1.

Looking at the stator 106 as a whole, there are a plurality of stator teeth 113 around which only one type of sub-winding is wound, such as stator teeth 113 ₂ , 113 ₄ , 113 ₆ ,..., 113 ₂₂ , 113 _24. It is arranged for each. In the example shown in FIG. 4, there are two stator teeth 113 around which only one type of sub-winding is wound. In this way, the stator teeth 113 in which only one type of sub-winding is wound are included, so that the stator teeth in which only one type of sub-winding is wound can be obtained. Compared with the case where it is not included, the number of turns of the sub-windings wound around each stator tooth can be reduced.

The stator teeth existing between the pair of stator teeth around which only one type of sub-winding is wound are connected to the sub-windings wound around one of the pair of stator teeth. A sub-winding having the same tip, a sub-winding wound around the other, and a sub-winding having the same connection destination are wound. Specifically, it will be described with reference to FIG. 3 by way of the stator teeth ₁₁₃ 2, 113 ₄ as an example. The stator teeth 113 ₃ only sub winding 114U ₁ b only wound in which the stator teeth 113 ₂ and the sub winding 114U ₂ b exists between the stator teeth 113 ₄ are spirally wound, The sub-winding 114U ₁ b and the connection destination (the connection destination here is the U-phase arm 103u of the first three-phase inverter 101), the sub-winding 114U ₁ c, the sub-winding 114U ₂ b, A sub winding 114U ₂ a having the same connection destination (the connection destination here is the U-phase arm 104u of the second three-phase inverter 102) is wound.

  Such winding is performed for each stator winding 114, so that when viewed with a pair of adjacent stator teeth 113, two or more sub-windings are wound around at least one stator tooth 113. These sub-windings are connected to different three-phase inverters. That is, the stator teeth 113 around which only one sub winding having a different connection destination is wound are not adjacent to each other.

The turn ratio of one or more sub-windings wound around the stator teeth 113 is adjusted so that the electrical angle phase difference between the adjacent stator teeth 113 is equal between the stator teeth. . Specifically, referring to FIG. 3, when the number of turns of the sub-windings 114U ₁ b is N1, and the number of turns of the sub-windings 114U ₁ a and 114U ₁ c is N2, the following relationship is satisfied.
N2 = N1 / 2 (cos (π / 3 / K))
In this embodiment, since K = 4,
N2 = N1 / 2 (cos (π / 12))
The relationship is satisfied. For example, when N1 = 50, N2 = 25.8≈26.

3, 1 stator tooth ₁₁₃ to the stator windings 114U ₁ are _wound, 113 2, 113 in ₃ stator teeth groups of the sub-winding which is wound around the stator teeth in adjacency The winding directions of the lines are opposite to each other. Specifically, the sub-winding 114U ₁ a wound around the stator teeth 113 ₁ and the sub-winding 114U ₁ b wound around the stator teeth 113 ₂ are opposite in winding direction. . Further, the sub winding 114U ₁ b which are wound stator teeth 113 ₂ wound, sub winding 114U ₁ c which are wound stator teeth 113 ₃ wound in the winding direction to each other are opposite.

<Effect>
By setting each stator winding (each sub-winding) as described above, for example, the first fixed winding in which only the sub-windings connected to the first three-phase inverter 101 are wound. Of the stator teeth adjacent to the child teeth (stator teeth adjacent to the stator teeth on which only one type of sub-winding is wound), at least one second stator tooth has two or more sub teeth. The winding is wound. In other words, both the sub-windings connected to the first three-phase inverter 101 and the sub-windings connected to the second three-phase inverter 102 are necessarily wound around the second stator teeth. Will be. For this reason, even if the current phase control in the first three-phase inverter 101 and the second three-phase inverter 102 varies, the second stator teeth are connected to the second three-phase inverter 102. Compared to the case where only the sub-winding is wound (in the case of Patent Document 1), the influence of the variation is less likely to appear as the variation of the torque acting on each stator tooth.

The reason for this can be explained as follows. First, a conventional stator teeth 903 stator winding 904V ₁ in (FIG. 19) is wound, the stator winding 904W ₂ to note stator tooth 903 wound. The stator tooth 903 stator winding 904W ₂ is wound, only the stator windings 904W ₂ is wound. Therefore, the current phase control in the second three-phase inverter, the ideal case where the phase and shifted by alpha [rad], the magnetic field stator winding 904W ₂ is generated in the stator tooth 903 wound phase The effect on is α [rad] itself.

On the other hand, the stator teeth 113 ₂ stator windings 114U ₁ is wound in this embodiment (FIG. 3), the stator windings 114U ₂ to note stator teeth 113 ₃ wound. As described above, if the number of turns in the stator tooth 113 ₂ is 50, the number of turns in the stator teeth 113 ₃ is 26. Therefore, the current phase control in the second three-phase inverter 102 is the ideal case where the phase shifted alpha [rad] from the effect on the magnetic field of the phase generated in the stator tooth _{113 3 α × 26/50 [} rad ] = Α × 0.52 [rad], which is halved compared to the conventional example. That is, even if the current phase control in the second three-phase inverter is deviated, the influence is halved.

  FIG. 5A is a diagram showing a result of simulating the torque change related to the synchronous motor 100 of the first embodiment, and FIG. 5B is a simulation of the torque change related to the synchronous motor 900 of Patent Document 1. It is a figure which shows the result. In each figure, the horizontal axis represents the rotation angle (electrical angle) [°], and the vertical axis represents the torque [p. u]. The solid line is the result when there is no phase shift in the current phase control in the first and second three-phase inverters, and the broken line is the current phase control in either one of the first and second three-phase inverters. The result is shown when the angle is shifted by 20 [°].

As is clear from a comparison between FIG. 5A and FIG. 5B, according to the configuration of the present embodiment, there is no deviation in the current phase control in the three-phase inverter (solid line), and there is a deviation ( It can be seen that the torque pulsation is reduced in both cases (broken line).
As described above, even when there is a variation in current phase control among a plurality of three-phase inverters, it is possible to reduce the amount of deviation of the electrical angle phase due to this, resulting in torque It is possible to suppress an increase in pulsation.

  Further, according to the winding method of the sub-winding according to the present embodiment, since each stator winding is wound across a plurality of stator teeth, three-phase alternating current is supplied to the synchronous motor. It is possible to reduce the number of three-phase inverters required for the operation. In this embodiment, by winding each stator winding over three stator teeth, it can be driven by two three-phase inverters as shown in FIG. By reducing the number of three-phase inverters, the synchronous motor drive system can be reduced in size and cost. This configuration is particularly effective in the case of a synchronous motor drive system including a so-called multipolar synchronous motor in which the number of magnetic poles and stator teeth is relatively large as in the present embodiment. The present inventor has confirmed that there is no torque reduction by reducing the number of three-phase inverters, and that the same torque characteristics as when driven by two three-phase inverters can be obtained.

<< Second Embodiment >>
<Configuration>
FIG. 6 is a diagram showing an overall configuration of a synchronous motor drive system 2000 according to the second embodiment.
The synchronous motor drive system 2000 is obtained by replacing the synchronous motor 100 in the synchronous motor drive system 1000 according to the first embodiment with a synchronous motor 200.

FIG. 7 is a diagram illustrating an overall configuration of the synchronous motor 200 according to the second embodiment, and FIG. 8 is a detailed view of the synchronous motor 200.
The synchronous motor 200 includes a rotor 205 and a stator 206.
In the present embodiment, the permanent magnet 208 included in the rotor 205 has 28 poles. Therefore, the electrical angle is 14 times the mechanical angle. The stator 206 has 30 stator teeth 213 arranged at equal intervals in the circumferential direction. A stator winding 214 is wound around each stator tooth 213 in a concentrated manner.

  Twenty-eight magnetic poles 209 of the rotor 205 are arranged at equal intervals in the circumferential direction, and the mechanical angle is 360 / 28≈12.9 [°]. On the other hand, 30 stator teeth 213 are arranged at equal intervals in the circumferential direction, and the mechanical angle is 360/30 = 12 [°]. In this way, the stator teeth 213 are provided at an arrangement interval different from the arrangement interval of the magnetic poles 209, and the magnetic poles 209 and the stator teeth 213 are arranged so as to be shifted by 14/15 per half circumference. The interval between the stator teeth 213 is 14π / 15 [rad], and the electrical angle is 168 [°].

  Since the number of stator teeth 213 is 30 and the number of magnetic poles 209 is 28 in the synchronous motor 200, the number of magnetic poles 209 is 6K ± 2 when the number of stator teeth 213 is 6K also in this embodiment. The relationship is satisfied. Therefore, the synchronous motor 200 is also arranged so that the magnetic flux of the permanent magnet 208 can be used effectively. In this embodiment, a case where K = 5 is described.

The stator windings 214, when distinguished by its destination, 214U _1, 214U ₁ of FIG. _{1 ', 214V 1, 214V 1} ', 214W 1, 214W 1 ', 214U 2, 214U 2', 214V 2, 214V 2 There are 12 types as shown by ', 214W ₂ , 214W ₂ '. Each connection destination is the same as 114U ₁ , 114U ₁ ′,... 114W ₂ , 114W ₂ ′ in the first embodiment.

The phase difference between the output current U1 and the output current U2 shown in FIG. 6 is the same as that in the first embodiment when the number of three-phase inverters included in the synchronous motor drive system 2000 is L. L / K × (π / 3 [rad]). In this embodiment, since K = 5 and L = 2, the phase difference between the output current U1 and the output current U2 is 2π / 15 [rad]. Therefore, the stator windings 214U ₁ and 214U ₂ are supplied with electric power whose phases are shifted from each other by 2π / 15 [rad]. The same is true between the output current V1 and the output current V2 and between the output current W1 and the output current W2.

Further, stator windings 214U ₁ and 214U ₁ 'shown in FIG. 6 winding direction is the same. Stator winding 214V ₁ and 214V ₁ have a similar relationship also in ', the stator winding 214W ₁ and 214W _1'. This relationship is the same for the stator winding that receives power supply from the second three-phase inverter 102. If the value obtained by dividing the number of magnetic poles by 2 (that is, the number of pole pairs) is an even number as in this embodiment, in other words, if K is an odd number, the stator teeth are 180 [°] symmetrical in mechanical angle. The stator windings wound around the same winding direction.

Figure 8 is an enlarged view of the second embodiment the stator teeth ₂₁₃ stator windings 214U ₁ according to the embodiment is wound _1, 213 _2, 213 3, 213 around _4. The stator teeth 213 ₁ are arranged at a mechanical angle of −12 [°] (positions shifted by (π−π / 15) [rad] in electrical angles) with respect to the stator teeth 213 ₂ . Furthermore, the stator teeth 213 ₃ (in the electrical angle, (π-π / 15) [rad] position shifted) position of +12 [°] in mechanical angle with respect to the stator tooth 213 ₂ are disposed .

Next, how to wind each stator winding 214 will be described including the structure of each stator winding 214.
First, as shown in FIG. 8, the stator winding 214U ₁ is the stator teeth 213 ₁ wound and a sub winding 214U ₁ a which is wound, the sub winding 214U ₁ which is wound stator teeth 213 ₂ wound and b, it consists of a sub winding 214U ₁ c which is wound stator teeth 213 ₃ wound, the sub winding 214U ₁ d which is wound stator teeth 213 ₄ wound. Sub-windings 214U ₁ a, 214U ₁ b, 214U ₁ c, 214U ₁ d are connected in series across stator teeth 213 ₁ , 213 ₂ , 213 ₃ , 213 ₄ , so that the connection destination is the same constitute the stator windings 214U _1. The other stator windings not shown in FIG. 8 have the same configuration.

Further, as shown in FIG. 8, the stator teeth 213 _3, only the stator windings 214U ₁ is wound. On the other hand, the stator teeth ₂₁₃ 1, 213 _2, the stator windings 214U ₁ and two stator coils of the stator coil 214W ₂ 'are wound, the stator teeth 213 _4, the fixed two stator coils of the stator coil 214U ₂ is wound around the child windings 214U _1. Thus, the stator winding 214U ₁ is wound over a plurality of stator teeth 213.

FIG. 9 is a diagram illustrating an arrangement of the stator windings 214 in the stator 206 according to the second embodiment. Each of the plurality of elongated squares in FIG. 9 indicates each stator winding 214. In this embodiment, similarly to the stator windings 214U _1, contains four sub-windings to each stator winding 214. Further, as shown in FIG. 9, the stator winding 214 other than the stator windings 214U ₁ is also wound over a plurality of stator teeth 213 similarly to the stator windings 214U _1.

Looking at the stator 206 as a whole, there are a plurality of stator teeth 213 around which only one type of sub-winding is wound, such as stator teeth 213 ₃ , 213 ₅ , 213 ₈ , 213 ₂₈ , 213 _30. It is arranged for each. In the example shown in FIG. 9, there are a place where the stator teeth 213 around which only one type of sub-winding is wound are arranged every two pieces and a place where every three pieces are arranged.

Also in the present embodiment, a stator tooth existing between a pair of stator teeth around which only one type of sub-winding is wound includes a sub coil wound around one of the pair of stator teeth. A sub-winding having the same winding and connection destination, and a sub-winding wound on the other side and a sub-winding having the same connection destination are wound. Specifically explaining with reference to FIG. 8, the sub-windings 214U ₁ c only stator tooth 213 ₃ and the sub winding 214W ₂ which are wound 'b only of the stator teeth _{213 30} are wound There are stator teeth 213 ₁ and 213 ₂ between them. The stator teeth 213 _1, and the sub winding 214U ₁ c and the destination is the same sub-windings 214U ₁ a, sub winding 214W ₂ 'destination and b are identical sub winding 214W _2' and the c It is wound. Furthermore, the stator teeth 213 _2, the destination and the same sub-windings 214U ₁ b and sub winding 214U ₁ c, sub winding 214W ₂ 'b and the destination is the same sub winding 214W _2' d And are wound.

By making such a winding method for each stator winding 214, similarly to the first embodiment, the stator teeth 213 around which only one sub-winding having a different connection destination is wound, Never be next to each other.
When only one stator tooth 213 is disposed between the stator teeth 213 around which only one type of sub-winding is wound, one or more sub-windings wound around the stator teeth 213 It turns ratio, one of the stator teeth 213 only sub winding is wound, for example, N1,2 type the number of turns of the stator teeth 213 ₃ wound on the sub-windings 214U 1 _c sub winding If the line is the stator teeth 213 are wound, for example, the number of turns of the stator teeth 213 ₄ wound on the sub-windings 214U 1 _d and N2, the following relationship is satisfied.

N2 = N1 / 2 (cos (π / 3 / K))
In this embodiment, since K = 5,
N2 = N1 / 2 (cos (π / 15))
The relationship is satisfied. For example, when N1 = 50, N2 = 24.45≈24.

On the other hand, when two stator teeth 213 are arranged between stator teeth 213 around which only one type of sub-winding is wound, one or more sub-windings wound around those stator teeth 213 The turns ratio of the winding is as follows.
Two stator teeth 213 sub winding is wound, for example, among the stator teeth 213 ₂ wound on the sub-windings 214, adjacent only one type of sub-windings are wound The number of turns of the sub-winding 214U ₁ b of the same type as the sub-winding 214U ₁ c wound around the stator tooth 213 ₃ as the stator tooth 213 is N3, and the number of turns of the other sub-winding 214W ₂ ′ d Is N4, the following relationship is satisfied.

N3 = N1 × sin (2x) / sin (3x)
N4 = N1 × sin (x) / sin (3x)
However, x = (π / 3 / K).
In FIG. 8, in the stator teeth group consisting of the stator teeth 213 ₁ , 213 ₂ , 213 ₃ , and 213 ₄ around which the stator winding 214U ₁ is wound, the stator teeth 214U ₁ are wound around the adjacent stator teeth. The sub-windings that are provided have opposite winding directions. Specifically, the sub winding 214U ₁ a and the sub winding 214U ₁ b, the sub winding 214U ₁ b and the sub winding 214U ₁ c, the sub winding 214U ₁ c and the sub winding 214U ₁ d are wound together. The direction is reversed.

<Effect>
Also in the present embodiment, two or more sub-windings are wound around at least one stator tooth 213 in each of the pair of stator teeth 213 that are adjacent to each other, and these sub-windings are different from each other. It is designed to be connected to a three-phase inverter. Therefore, also in this embodiment, the same torque pulsation reduction effect as that of the first embodiment can be obtained.

Moreover, as shown in FIG. 6, it can drive by two three-phase inverters by winding each stator winding over four stator teeth like this embodiment. Therefore, also in this embodiment, the synchronous motor drive system can be reduced in size and cost.
<< Third Embodiment >>
In the first and second embodiments, the winding method includes a stator tooth around which only one type of sub-winding is wound. However, the present invention is not limited to this. In the present embodiment, an example will be described in which a stator tooth around which only one type of sub-winding is wound is not included.

FIG. 10 is a diagram illustrating an overall configuration of a synchronous motor drive system 3000 according to the third embodiment.
The synchronous motor drive system 3000 includes a synchronous motor 300, a first three-phase inverter 301 that supplies power to the synchronous motor 300, a second three-phase inverter 302, and a third three-phase inverter 303.

The synchronous motor 300 includes the same rotor 105 and stator 106 as the synchronous motor 100 (FIG. 2) according to the first embodiment. The difference between the synchronous motor 300 and the synchronous motor 100 is the number of stator windings and how to wind each stator winding.
As shown in FIG. 10, the synchronous motor 300 includes 314 U ₁ , 314 U ₁ ′, 314 V ₁ , 314 V ₁ ′, 314 W ₁ , 314 W ₁ ′, 314 U ₂ , 314 U ₂ ′, 314 V ₂ , 314 V ₂ ′, 314 W ₂ , It has 18 kinds of stator windings indicated by 314W ₂ ′, 314 U ₃ , 314 U ₃ ′, 314 V ₃ , 314 V ₃ ′, 314 W ₃ , and 314 W ₃ ′.

The stator windings 314U ₁ and 314U ₁ ′ are connected to the U-phase arm 304u of the first three-phase inverter 301, and the stator windings 314V ₁ and 314V ₁ ′ are connected to the V-phase arm 304v of the first three-phase inverter 301, Stator windings 314W ₁ and 314W ₁ ′ are connected to the W-phase arm 304w of the first three-phase inverter 301, respectively. Although not specifically described, the stator windings 314U ₂ , 314U ₂ ′, 314V ₂ , 314V ₂ ′, 314W ₂ , 314W ₂ ′, 314U ₃ , 314U ₃ ′, 314V ₃ , 314V ₃ ′, 314W ₃ , 314W ₃ ′ A similar connection relationship is established for.

The phase difference between the output current U1 and the output current U2 and the phase difference between the output current U2 and the output current U3 shown in FIG. 10 are expressed by (π / 3 [rad]) / K using the above K. . In this embodiment, since K = 4, the phase difference between the output current U1 and the output current U2 and the phase difference between the output current U2 and the output current U3 are π / 12 [rad]. Therefore, the stator windings 314U ₁ and 314U ₂ are supplied with electric power whose phases are shifted from each other by π / 12 [rad], and the stator windings 314U ₂ and 314U ₃ are mutually phased by π / 12 [rad]. ] The shifted power is supplied. The same applies to the output current V1, the output current V2, the output current V2, the output current V3, the output current W1, the output current W2, and the output current W2, the output current W3.

FIG. 11 is a diagram showing the arrangement of the stator windings in the stator 106 according to the third embodiment.
In this embodiment, each stator winding is wound over three stator teeth 113. Furthermore, a so two or more sub-windings are wound in either of the stator teeth 113, in the stator teeth _{113 3,} 113 _{7, 113} 11, _{113 15,} 113 19, _{113 23} Three sub-windings are wound. As a result of such a winding method, there is no stator tooth 113 around which only one type of sub-winding is wound.

Even in the winding method as in this embodiment, two or more sub-windings are wound around at least one stator tooth 113 in each of the pair of stator teeth 113 that are adjacent to each other. The sub-windings are connected to different three-phase inverters. Therefore, it is possible to suppress the torque pulsation compared to the conventional case.
In the present embodiment, each stator winding is wound over three stator teeth 113. Therefore, according to the present embodiment, as shown in FIG. 10, the number of necessary three-phase inverters can be three. Therefore, also in this embodiment, the synchronous motor drive system can be reduced in size and cost.

<< Fourth Embodiment >>
Also in this embodiment, an example will be described in which a stator tooth around which only one type of sub-winding is wound is not included as in the third embodiment.
FIG. 12 is a diagram showing an overall configuration of a synchronous motor drive system 4000 according to the fourth embodiment.

The synchronous motor drive system 4000 is obtained by replacing the synchronous motor 300 in the synchronous motor drive system 3000 according to the third embodiment with a synchronous motor 400.
The synchronous motor 400 includes the same rotor 205 and stator 206 as the synchronous motor 200 (FIG. 7) according to the second embodiment. The difference between the synchronous motor 400 and the synchronous motor 200 is the number of stator windings and how to wind each stator winding.

As shown in FIG. 12, the synchronous motor 400 includes 414U _{1 to} 414U ₃ , 414U ₁ ′ to 414U ₃ ′, 414V _{1 to} 414V ₃ , 414V ₁ ′ to 414V ₃ ′, 414W _{1 to} 414W ₃ , 414W ₁ ′ to It has 18 types of stator windings of 414W ₃ '. The connection relationship between the stator windings is substantially the same as that in the third embodiment. However, unlike the third embodiment, the stator windings 414U ₁ and 414U ₁ 'is winding directions are the same.

The phase difference between the output current U1 and the output current U2 and the phase difference between the output current U2 and the output current U3 shown in FIG. 12 are obtained by using the above K (π / 3) as in the case of the above embodiment. [Rad]) / K. In this embodiment, since K = 5, the phase difference between the output current U1 and the output current U2 and the phase difference between the output current U2 and the output current U3 are π / 15 [rad]. Therefore, the stator windings 414U ₁ and 414U ₂ are supplied with electric power whose phases are shifted from each other by π / 15 [rad], and the stator windings 414U ₂ and 414U ₃ are mutually phased by π / 15 [rad]. ] The shifted power is supplied. The same applies to the output current V1, the output current V2, the output current V2, the output current V3, the output current W1, the output current W2, and the output current W2, the output current W3.

FIG. 13 is a diagram illustrating an arrangement of the stator windings in the stator 206 according to the fourth embodiment.
In this embodiment, each stator winding is wound over four stator teeth 213. Further, in each stator tooth 213, two or more sub-windings are wound, and the stator teeth 213 ₂ , 213 ₄ , 213 ₇ , 213 ₉ , 213 ₁₂ , 213 ₁₄ , 213 ₁₇ , In 213 ₁₉ , 213 ₂₂ , 213 ₂₄ , 213 ₂₇ , and 213 ₂₉ , three types of sub-windings are wound. As a result of this way of winding, there is no stator tooth 213 around which only one type of sub-winding is wound, as in the third embodiment. Therefore, it is possible to suppress the torque pulsation compared to the conventional case.

When each stator winding is wound over the four stator teeth 213 as in this embodiment, the required number of three-phase inverters is three as shown in FIG. It is possible to Therefore, also in this embodiment, the synchronous motor drive system can be reduced in size and cost.
≪Modifications ・ Others≫
Although the first to fourth embodiments have been described above, the present invention is not limited to these embodiments. For example, the following modifications can be considered.

(1) In the above embodiment, the case of K = 4 and K = 5 has been described. However, in the present invention, the numerical value of K is not particularly limited. Here, how to wind each stator winding in the case of K = 6 and K = 7 will be briefly described.
FIG. 14 is a table showing the stator teeth and the stator windings wound around the stator teeth when K = 6 and L = 2. The numbers of the stator teeth are shown above each table shown in FIG. Since K = 6 in this example, there are 1 to 36 stator teeth. The types of stator windings are shown on the left side of each table shown in FIG. Since L = 2 in this example, there are 12 types as in the first and second embodiments. For example, “U1” indicates that it is connected to the U-phase arm of the first inverter, and “U2” indicates that it is connected to the U-phase arm of the second inverter. “U1 ′” is connected to the U-phase arm of the first inverter in the same manner as “U1”, but “U1” has a winding direction opposite to that of “U1”. Each stator winding is wound around a stator tooth which is circled in this table. For example, “U1” indicates that it is wound around the first to fifth stator teeth.

  As shown in FIG. 14, each stator winding is wound over five stator teeth. That is, each stator winding is composed of five sub-windings. Stator teeth around which only one sub-winding is wound are No. 3, No. 6, No. 9,... No. 30, No. 33, No. 36, and there is one for every three stator teeth. . Focusing on the 4th and 5th stator teeth between the 3rd and 6th stator teeth, each stator tooth is wound around the 3rd stator teeth. The stator winding (U1) connected to the same sub-winding, and the stator winding (U2) wound around the No. 6 stator tooth and the sub-winding connected to the same winding are wound. It has been turned.

  15 and 16 are tables showing the stator teeth and the stator windings wound around the stator teeth when K = 6 and L = 3. In this example, since K = 6, there are 1 to 36 stator teeth. In this example, since L = 3, there are 18 types of stator windings. As shown in FIGS. 15 and 16, each stator winding is wound over three stator teeth, so each stator winding is composed of three sub-windings. . Stator teeth around which only one sub-winding is wound are No. 2, No. 4, No. 6,..., No. 32, No. 34, No. 36, and there is one for every two stator teeth. . Focusing on the 3rd stator tooth existing between the 2nd and 4th stator teeth, the stator winding (U1) wound around the 2nd stator teeth and the connection destination Are wound around the same sub-winding, the stator winding (U2) wound around the fourth stator tooth, and the sub-winding having the same connection destination.

  FIG. 17 is a table showing the stator teeth and the stator windings wound around the stator teeth when K = 7 and L = 2. Since K = 7 in this example, there are 1 to 42 stator teeth. In this example, since L = 2, there are 12 types of stator windings. As shown in FIG. 17, each stator winding is wound over six stator teeth, so each stator winding is composed of six sub-windings. Stator teeth around which only one sub-winding is wound are No. 4, No. 7, No. 11, No. 14,..., No. 32, No. 35, No. 39, No. 42, and three stator teeth. There are one location for every four and one location for every four. Focusing on the 5th and 6th stator teeth that exist between the 4th and 7th stator teeth, each of the stator teeth is wound around the 4th stator teeth. The stator winding (U1) connected to the same sub-winding, and the stator winding (U2) wound around the No. 7 stator tooth and the sub-winding connected to the same winding are wound. It has been turned.

As described above, in the examples shown in FIGS. 14 to 17, each of the pair of stator teeth that are adjacent to each other has two or more sub-windings wound around at least one of the stator teeth. The sub windings can be connected to different three-phase inverters. Therefore, it is possible to suppress torque pulsation compared to the conventional case.
(2) As in the examples shown in the first and second embodiments and FIGS. 14 to 17, the number of three-phase inverters is set to L of 2 / K or less (where L is an integer of 2 or more). Thus, it is possible to have a stator tooth around which only one type of sub-winding is wound. Therefore, the number of sub-windings wound around each stator tooth can be reduced by setting the number of three-phase inverters to L which is 2 / K or less.

  (3) In the first to fourth embodiments, when the number of stator teeth is 6K, the number of magnetic poles is represented by 6K ± 2, but this is merely an example, and is not necessarily It is not necessary to satisfy this relationship. Even in a synchronous motor drive system including a synchronous motor that does not satisfy this relationship, the present invention can be applied as long as the synchronous motor is supplied with three-phase alternating current from a plurality of three-phase inverters. is there. Note that all synchronous motors having 6K stator teeth and 6K ± 2 magnetic poles can be driven by two three-phase inverters.

(4) As described above, the numerical value of K is not particularly limited, but K is preferably 4-6. When K is 4 to 6 and the relationship “the number of magnetic poles is represented by 6K ± 2 when the number of stator teeth is 6K” is satisfied, the number of magnetic poles is 22, 26, 28 , 32, 34, and 38 are effective for increasing torque.
Furthermore, there are the following advantages by setting K to 4-6. For example, in an in-wheel motor that directly drives a tire of an electric vehicle, the maximum rotational speed is about 1200 to 1500 [r / min]. Here, each of the U-phase arm, the V-phase arm, and the W-phase arm of the three-phase inverter is composed of switching elements connected in series. As the switching element, a power semiconductor element typified by an insulated gate bipolar transistor (IGBT) is used, and the power semiconductor element is driven and controlled based on a pulse width modulation method (PWM method). . The frequency of the drive current waveform of the electric motor generated based on the PWM method using this power semiconductor element is currently about 400 [Hz], which is the practical upper limit. The number of poles of the electric motor that satisfies this condition is about 32 to 40 poles. Therefore, a practical and high-performance electric motor can be configured by setting K to 4-6.

  (5) The winding method of each stator winding shown in the first to fourth embodiments and FIGS. 14 to 19 is merely an example of the present invention. One or more windings wound around each stator tooth has a pair of stator teeth adjacent to each other, and two or more sub-windings are wound around at least one stator tooth. As long as these sub-windings are connected to different three-phase inverters, the winding method is not limited to the above.

  (6) As described in the first embodiment, when the value obtained by dividing the number of magnetic poles by 2 (that is, the number of pole pairs) is an odd number as in the first embodiment, in other words, when K is an even number, The winding directions of the stator windings wound around the stator teeth at a mechanical angle of 180 [°] are opposite to each other. This is true not only in the first embodiment, but also in the third embodiment in which K is an even number and FIGS.

  Further, as described in the second embodiment, when the value obtained by dividing the number of magnetic poles by 2 (that is, the number of pole pairs) is an even number as in the second embodiment, in other words, when K is an odd number, The stator windings wound around the stator teeth at 180 [°] symmetrical positions at the corners have the same winding direction. This applies not only to the second embodiment, but also to the fourth embodiment in which K is an odd number and the case of FIG.

  (7) In the third embodiment (K = 4, L = 3), when the current phase in the first three-phase inverter is 0 [rad], the current phase in the second three-phase inverter is π / Although an example in which the current phase in the third three-phase inverter is π / 6 [rad] has been described, the present invention is not limited to this. Among the four current phases of 0 [rad], (π / 3) / K × 1 [rad], (π / 3) / K × 2 [rad], (π / 3) / K × 3 [rad] From these, three current phases can be arbitrarily selected. In the third embodiment, an example in which 0 [rad], (π / 3) / K × 1 [rad], (π / 3) / K × 2 [rad] is selected is shown.

(8) In the first to fourth embodiments, the stator winding is wound around the stator teeth. However, the present invention is not limited to this, and can be applied to a so-called coreless motor without the stator teeth. is there.
(9) Although not specifically mentioned in the first to fourth embodiments, a skew arrangement in which the stator teeth are shifted in the circumferential direction by a maximum in the circumferential direction as the stator teeth proceed in the axial direction of the rotor is applied. It is good.

  (10) In the first to fourth embodiments, the outer rotor type synchronous motor in which the rotor is disposed outside the stator is described, but the inner rotor type in which the rotor is disposed inside the stator. The present invention can also be applied to other synchronous motors. FIG. 18 is a diagram illustrating an overall configuration of an inner rotor type synchronous motor 700. Synchronous motor 700 includes a rotor 705 and a stator 706. Permanent magnets 708 are arranged on the rotor 705 at equal intervals in the circumferential direction. Stator teeth 713 are arranged on the stator 706 at equal intervals in the circumferential direction so as to face the permanent magnet 708. A stator winding 714 is wound around the stator teeth 713.

The present invention further includes not only an inner rotor type synchronous motor, but also a so-called face-facing axial gap synchronous motor in which a rotor and a stator are arranged with a gap in the axial direction, and a combination thereof. The same effect can be obtained with a synchronous motor having a structure.
(11) In the first to fourth embodiments, the magnetic poles of the rotor are constituted by permanent magnets. However, a synchronous motor using reluctance torque constituted by a difference in magnetic resistance, or a synchronous motor combining both of them with a rotor. Applicable.

(12) The present invention can be applied not only to a synchronous rotating machine, but also to a synchronous generator, a linear synchronous motor driven linearly, and a linear synchronous generator.
(13) Each drawing only schematically shows the arrangement relationship to such an extent that the present invention can be understood. Therefore, the present invention is not limited to the illustrated examples. In addition, some parts are omitted for easy understanding of the drawing.

  (14) The above-described embodiments and modifications are merely preferred examples, and the present invention is not limited thereto. Moreover, it is also possible to combine suitably the structure quoted in these embodiment and the modified example suitably.

  INDUSTRIAL APPLICABILITY The present invention can be suitably used for a synchronous motor drive system for a compressor, an electric vehicle, a hybrid vehicle, a fuel cell vehicle, and the like that require low vibration and noise.

100, 200, 300, 400, 700, 900 Synchronous motor 101, 301 First three-phase inverter 102, 302 Second three-phase inverter 103u, 304u U-phase arm 103v, 304v V-phase arm 103w, 304w W-phase arm 104u U-phase arm 104v V-phase arm 104w W-phase arm 105, 205, 705, 901 Rotor 106, 206, 706, 806, 902 Stator 107 Rotor core 108, 208, 708 Permanent magnet 109, 209, 905 Magnetic pole 110, 111 between the rotor magnetic poles 112 stator yoke 113,213,713,813,903 stator teeth _{114,214,314,414,714,904U 1, 904V 1, 904W 1} , 904U 1 ', 904V 1', 904W 1 ', 904U ₂ 904V _2, 904W ₂ stator winding 303 third three-phase inverter 1000,2000,3000,4000 synchronous motor drive system BA Power

Claims (6)

A synchronous motor including a rotor having a plurality of magnetic poles arranged at equal intervals in the circumferential direction and a stator having a plurality of stator teeth arranged at equal intervals in the circumferential direction;
A synchronous motor drive system comprising a plurality of three-phase inverters for supplying a plurality of three-phase alternating currents out of phase with each other to the synchronous motor,
Each stator tooth has one or more types of windings wound around a concentrated winding.
Each winding wound around each stator tooth is connected to one of the plurality of three-phase inverters,
The pair of stator teeth that are adjacent to each other
Two or more types of windings are wound around at least one stator tooth, and these windings are connected to different three-phase inverters.
Synchronous motor drive system. Stator teeth around which only one type of winding is wound are arranged for each of the plurality,
A stator tooth existing between a pair of stator teeth around which only one type of winding is wound has the same connection destination as the winding wound around one of the pair of stator teeth. A winding and a winding wound on the other side and a winding having the same connection destination are wound.
The synchronous motor drive system according to claim 1. The number of the plurality of magnetic poles is 6K ± 2.
The number of the plurality of stator teeth is 6K.
The synchronous motor drive system according to claim 2. The number of the plurality of three-phase inverters is K or less L (where L is an integer of 2 or more).
The synchronous motor drive system according to claim 3. The windings wound around a plurality of adjacent stator teeth are connected in series with each other, so that the connection destination is the same, and the plurality of windings with the same connection destination are wound. In the stator teeth group consisting of the stator teeth,
The windings wound around the adjacent stator teeth have opposite winding directions.
The synchronous motor drive system according to claim 2. The turn ratio of each winding wound around each stator tooth is adjusted so that the electrical angle phase difference between adjacent stator teeth is equal between each stator tooth.
The synchronous motor drive system of any one of Claims 1-5.

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