JP2012060788A - Stator of rotary electric machine and rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator of a rotary electric machine and a rotary electric machine provided with the stator which are capable of securing an insulation performance between the same phases, and accommodating high-voltage needs, and accommodating high power needs by a small size.SOLUTION: In a stator of an rotary electric machine of the present embodiment, a stator coil which has two or more phases and is comprised of a plurality of unit coils connected is wound and attached on a stator core. The stator coils of each phase are constituted by that a plurality of coil arrays comprised of a plurality of coils connected in series are connected to power input terminals of each phase. Each turn number of the coil arrays of plural lines is configured so as to be equal. A plurality of unit coils of each phase are constituted by a combination of coils of the coil arrays not less than 2 among said plurality of coil arrays, and are configured so that the turn number may be equal.

Description

  Embodiments described herein relate generally to a stator of a rotating electrical machine and a rotating electrical machine including the stator.

  2. Description of the Related Art Conventionally, in a rotating electrical machine for a vehicle mounted as a drive motor in an electric vehicle or a hybrid vehicle, a plurality of unit coils are connected in series as a stator coil of each phase of a plurality of stator coils constituting a stator. For example, two coil arrays connected in parallel may be provided. The plurality of unit coils are wound around the stator core so that each forms a magnetic pole.

As a winding method of each unit coil of such a stator coil, there is a method called adjacent pole connection. For example, in the case where one phase is composed of eight unit coils, the eight unit coils are divided into a first coil row and a second coil row. The unit coils of the first and second coil arrays are connected in series so as to have opposite polarities alternately. A series circuit of the first and second coil arrays is connected in parallel. In the parallel circuit including the first and second coil arrays, one common connection point is connected to the power input terminal, and the other common connection point is connected to the neutral point terminal.
In such a configuration, the insulation between the in-phase unit coils (insulation between the in-phases) is performed by the enamel coating of the conductors constituting each unit coil.

  By the way, in a motor for a vehicle such as an electric vehicle or a hybrid vehicle, an applied voltage (use voltage) is increased in order to reduce the size and obtain a high output. There is a possibility that the potential difference between the unit coils becomes large and insulation performance cannot be secured.

JP 2008-107996 A (FIGS. 7 and 8)

  Accordingly, there are provided a stator for a rotating electrical machine that can ensure in-phase insulation performance, can cope with a high voltage, can be reduced in size, and can achieve a high output, and a rotating electrical machine including the stator.

In the stator of the rotating electrical machine according to the present embodiment, a plurality of phase stator coils formed by connecting a plurality of unit coils are wound around a stator core. The stator coil of each phase is configured by connecting a plurality of coil arrays formed by connecting a plurality of coils in series to a power input terminal of each phase. The number of turns of the plurality of coil rows is set to be equal. The plurality of unit coils of each phase are configured by combining coils of two or more coil arrays out of the plurality of coil arrays, and are set to have the same number of turns.
The rotating electrical machine according to the present embodiment includes the above-described stator and a rotor disposed in the field space of the stator.

The figure which shows typically the connection structure of the U-phase stator coil of 1st Embodiment. The figure which shows simply arrangement and connection composition of a U-phase stator coil Schematic showing the configuration of a permanent magnet motor Diagram showing equivalent circuit of U-phase stator coil Diagram showing the equivalent circuit of a three-phase stator coil FIG. 1 equivalent diagram showing a comparative example with the first embodiment FIG. 1 equivalent diagram showing the second embodiment 2 equivalent diagram FIG. 1 equivalent diagram showing a comparative example with the second embodiment FIG. 1 equivalent view showing the third embodiment 2 equivalent diagram FIG. 1 equivalent diagram showing a comparative example with the third embodiment FIG. 1 equivalent view showing the fourth embodiment 2 equivalent diagram FIG. 1 equivalent diagram showing a comparative example with the fourth embodiment

[First embodiment]
Hereinafter, a first embodiment in which the present invention is applied to an inverter-driven permanent magnet motor used in an electric vehicle, a hybrid vehicle, or the like will be described with reference to FIGS.
As shown in FIG. 3, the permanent magnet motor 1 (rotating electric machine) includes a stator 2 and a rotor 3. In the stator 2, a plurality of phases, for example, three-phase (U-phase, V-phase, W-phase) stator coils 5 (U-phase coil 5 u, V-phase coil 5 v, W-phase coil 5 w) are wound around the stator core 4. It is a mounted configuration. The stator core 4 is formed by laminating a plurality of annular cores made of electromagnetic steel plates and integrally bonding them, and has a cylindrical shape.

  On the inner periphery of the stator core 4, 72 slots 6 for accommodating the stator coils 5 u to 5 w of each phase are formed at equal angles. Slot insulating paper (not shown) is arranged inside each slot 6, so that a space between the stator core 4 and the stator coils 5 u to 5 w of each phase disposed in the slot 6 is provided. Insulated.

  The rotor 3 includes a rotor core 7 and a rotating shaft 8 provided on the inner peripheral side of the rotor core 7. The rotor core 7 is formed by laminating a plurality of annular cores made of electromagnetic steel plates and integrally bonding them, and has a cylindrical shape. The rotor 3 is arranged in the field space of the stator 2 with a slight gap (air gap) between its outer peripheral surface and the inner peripheral surface of the stator 2, and can rotate with respect to the stator 2. It has become. The rotating shaft 8 passes through the rotor core 7 in the stacking direction of the iron core material, and is fixed to the rotor core 7.

  A plurality of pairs, for example, 12 pairs (12 poles) of a pair of magnetic material slots 9 whose opposing distances are sequentially increased toward the outer periphery are provided on the outer peripheral portion of the rotor core 7 with a certain interval in the circumferential direction. These have penetrated the rotor core 7 in the lamination direction of the iron core material. A permanent magnet 10 is inserted into each magnetic material slot 9. The pair of permanent magnets 10 are arranged on the outer peripheral side of the rotor core 7 so that the polarities (N pole and S pole) are alternately reversed, and form a magnetic pole of the permanent magnet electric motor 1.

  FIG. 4 shows an equivalent circuit of the U-phase stator coil 5u. The U-phase coil 5u is configured by connecting two coil arrays 5u1 and 5u2 in parallel. The coil array 5u1 is formed by connecting twelve coils U1 to U12 in series. The coil row 5u2 is formed by connecting twelve coils U1 ′ to U12 ′ in series. One terminal of each of the coil arrays 5u1 and 5u2 is connected to the power input terminal Pu, and the other terminal is connected to the neutral point terminal N. The V-phase coil 5v and the W-phase coil 5w have the same configuration as the U-phase coil 5u.

  FIG. 5 shows a schematic diagram of the winding structure of the three-phase stator coils 5u, 5v, 5w. The U-phase coil 5u, the V-phase coil 5v, and the W-phase coil 5w are star-connected via a neutral point terminal N. One terminal of each of the U-phase coil 5u, V-phase coil 5v, and W-phase coil 5w that is star-connected is connected to the three-phase power input terminals Pu, Pv, and Pw.

  FIG. 1 is a diagram schematically showing the connection configuration of each coil in the U-phase coil 5u. As shown in FIG. 1, each coil is connected via a jumper. The winding of the U-phase coil 5u is started with the neutral point terminal N as the winding start end, and the coils U12, U11, U10, U9, U8, U7, U6, U5, U4, U3, U2, U1 are alternately arranged in this order. Is wound in the reverse direction. Next, the coils U1 ′, U2 ′, U3 ′, U4 ′, U5 ′, U6 ′, U7 ′, U8 ′, U9 ′, U10 ′, U11 ′, U12 ′ are alternately reversed in this order. Winding is completed with the neutral point terminal N as the end of winding.

The connecting wire between the coil U1 and the coil U1 ′ is cut and becomes the starting ends of the coil arrays 5u1 and 5u2, and is connected to the power input terminal Pu to which the U-phase power is supplied. On the other hand, the winding start end of the coil U12 and the winding end end of the coil U12 ′, which are the other ends of the coil arrays 5u1 and 5u2, are connected to the neutral point terminal N.
Here, the number of turns (number of turns) of the coils U1 to U12 is “4”, “3”, “4”, “3”, “4”, “3”, “4” in order, as shown in FIG. ”,“ 3 ”,“ 4 ”,“ 3 ”,“ 4 ”,“ 3 ”. Further, the numbers of turns of the coils U1 ′ to U12 ′ are “3”, “4”, “3”, “4”, “3”, “4”, “3”, “4”, “3” in this order. , “4”, “3”, “4”.

  The coil arrays 5u1 and 5u2 are both supplied with power from their starting ends, and the coils U1 to U12 and U1 ′ to U12 ′ are alternately wound in the reverse direction. Thus, the upper and lower coils shown in FIG. 1 have the same polarity. By superimposing the coil arrays 5u1 and 5u2 having such a configuration, one unit coil is formed by coils corresponding to the upper and lower sides, and one magnetic pole is formed. Thereby, 12 unit coils A1-A6 and B1-B6 (refer FIG. 2) are comprised, and 12 magnetic poles are formed. The number of turns of each unit coil is “7” by adding the number of turns of the two coils.

FIG. 2 is a diagram simply showing the arrangement and connection configuration of the U-phase coil 5u. As shown in FIG. 2, twelve unit coils A1 to A6 and B1 to B6 formed by superimposing the coil arrays 5u1 and 5u2 are arranged over the entire circumference of the stator core 4 adjacent to each other in the circumferential direction. Configured. The polarities of the twelve unit coils A1 to A6 and B1 to B6 are alternately different.
Specifically, one unit coil A1 is formed by the coils U1 and U1 ′, and similarly, coils U2 and U2 ′, coils U3 and U3 ′,..., Coils U11 and U11 ′, coils U12 and At U12 ′, unit coils B1, A2,..., A6, B6 are formed, and these are arranged in order clockwise.

  As shown in FIG. 3, the V-phase coil 5v is shifted to the slot 6 of the stator core 4 by 4 slots clockwise with respect to the U-phase coil 5u, and each unit is similar to the U-phase coil 5u. The coils are connected and connected by a crossover. Also, the W-phase coil 5w is also shifted by 4 slots clockwise to the slot 6 of the stator core 4 with respect to the V-phase coil 5v, and each unit coil is connected by a jumper as with the U-phase coil 5u described above. Has been stored.

  In the stator coils 5u to 5w of each phase, the different phases (between the coil end portions of the U phase and the V phase and between the coil end portions of the V phase and the W phase) are insulated by interphase insulating paper (not shown). It has become. On the other hand, between unit coils of the same phase (for example, in the case of U phase, between adjacent coil end portions of the coils U1 to U12 of the coil array 5u1 and adjacent coil ends of the coils U1 ′ to U12 ′ of the coil array 5u2 Are insulated by the enamel coating of the conductors constituting each coil.

  In this case, in the U-phase coil 5u, a part of the interphase insulating paper between the coil end portions of the U-phase coil 5u and the V-phase coil 5v is bent, and this bent portion is unit coil A1 (coils U1, U1 ′). And the unit coil B6 (coils U12, U12 ′) may be inserted as in-phase insulating paper. The same applies to the other V-phase coil 5v and W-phase coil 5w.

  FIG. 6 is a comparative example showing the winding structure of the stator coil with respect to the first embodiment, and has the same output characteristics as the stator 2 of the first embodiment. In this configuration, a coil array in which six unit coils A1 ′ to A3 ′ and B1 ′ to B3 ′ are connected in series, and six unit coils A4 ′ to A6 ′ and B4 ′ to B6 ′ are connected in series. The two coil arrays are connected in parallel with the coil array connected to. The number of turns of each unit coil is “7” turns. Assuming that the current per phase is I [ampere], the ampere turn of each unit coil is I [ampere] ÷ (number of parallel circuits) × (number of turns) = I ÷ 2 × 7 = 7 I / 2. Similarly, the ampere turn of each unit coil of the first embodiment is also I [ampere] / (number of parallel circuits) × (number of turns) = I ÷ 2 × (4 + 3) = 7 I / 2.

According to the stator 2 configured as described above, each unit coil is composed of two coils, so that the maximum potential difference in each unit coil is larger than that of the stator having the winding structure of the comparative example shown in FIG. Can be small. Thereby, insulation performance can be improved and it can respond to high voltage.
That is, in this embodiment, as shown in FIG. 1, the number of turns of the two coils constituting each unit coil is “3” or “4”, so the maximum number of turns per unit coil is “4”, and the ratio of the voltage shared by the unit coils is 4 ÷ {(4 + 3) × 6} = 2/21. On the other hand, in the comparative example, the number of turns per unit coil is “7”, and the ratio of the voltage shared by the unit coils is 7 ÷ (7 × 6) = 1/6. Since the potential difference per unit coil is smaller as the number of turns is smaller, the stator 2 of this embodiment can reduce the maximum potential difference per unit coil to 4/7 as compared with the comparative example. .
And since the shared voltage of a unit coil can be made small, it is not necessary to reinforce an insulator between each coil of an in-phase, and can fully secure the in-phase insulation performance.

According to the rotating electrical machine 1 configured as described above, since the in-phase insulation performance can be ensured, there is no need to reinforce the insulator, and the stator 2 corresponding to high voltage is provided. Can be planned.
In this embodiment, each unit coil has a number of turns of “7” and is composed of two coils with a number of turns of “3” or “4”. , May be changed as appropriate. For example, each unit coil may be composed of two coils, the number of turns of each unit coil may be “8”, and the number of turns of each coil may be “4”.

  Next, 2nd, 3rd, 4th embodiment is described with reference to FIGS. 7 to 15, the same parts as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only different parts are described.

[Second Embodiment]
In the second embodiment shown in FIGS. 7 and 8, the U-phase coil 5u is configured by connecting four coil arrays 5u1 ′, 5u2 ′, 5u3 ′, and 5u4 ′ in parallel. The coil array 5u1 ′ is configured by winding coils U1, U2, U3, U4, U5, and U6 alternately in the reverse direction and connected in series. Similarly, the coil array 5u2 ′ is composed of coils U1 ′ to U6 ′, the coil array 5u3 ′ is composed of coils U1 ″ to U6 ″, and the coil array 5u4 ′ is composed of coils U1 ′ ″ to It consists of U6 '''.
One end of each starting coil U1, U1 ′, U1 ″, U1 ′ ″ of each coil row 5u1 ′, 5u2 ′, 5u3 ′, 5u4 ′ is connected to the power input terminal Pu, and each terminating coil U6, U6 ′, One end of U6 ″, U6 ′ ″ is connected to the neutral point terminal N.

  The coil arrays 5u1 ′, 5u2 ′, 5u3 ′, and 5u4 ′ are supplied with power from one end of each starting coil, and the coils U1 to U6, U1 ′ to U6 ′, U1 ″ to U6 ″, U1. Since "" to U6 "" are alternately wound in the reverse direction, they have alternately different polarities, and the coils corresponding to the upper and lower shown in FIG. 7 have the same polarity. The coil arrays 5u1 ′ and 5u3 ′ and the coil arrays 5u2 ′ and 5u4 ′ having such a configuration are overlapped to form one unit coil between the upper and lower coils, and one magnetic pole is formed. Is done. Thereby, 12 unit coils A1-A6 and B1-B6 (refer FIG. 8) are comprised, and 12 magnetic poles are formed. The number of turns of each unit coil is all “7”.

As shown in FIG. 8, twelve unit coils A1 to A6 and B1 to B6 formed by superimposing the coil arrays 5u1 ′ and 5u3 ′ and the coil arrays 5u2 ′ and 5u4 ′ are adjacent to each other in the circumferential direction. The stator core 4 is arranged over the entire circumference. The polarities of the 12 unit coils are alternately different.
Specifically, a unit coil A1 is composed of coils U1 and U1 ″, and similarly, unit coils B1,..., And coils U6 and U6 ″ are unit coils B1,. , B3 are configured and are arranged in order clockwise. In addition, the coils U1 ′ and U1 ′ ″, the coils U2 ′ and U2 ′ ″,..., The coils U6 ′ and U6 ″ ′ form unit coils B4, A4,. These are arranged in order counterclockwise.
The V-phase coil 5v and the W-phase coil 5w are configured in the same manner as the U-phase coil 5u.

  FIG. 9 is a comparative example showing the winding structure of the stator coil for the second embodiment, and has the same output characteristics as the stator 2 of the second embodiment. In this configuration, three coils A1 ', B1', A2 ', B2', A3 ', B3', A4 ', B4', A5 ', B5', A6 ', B6', respectively Are connected in parallel. The number of turns of each unit coil is “7” turns. If the current per phase is I [ampere], the ampere turn of each unit coil is I [ampere] / (number of parallel circuits) × (number of turns) = I ÷ 4 × 7 = 7I / 4. Similarly, the ampere turn of each unit coil of the second embodiment is also I [ampere] ÷ (number of parallel circuits) × (number of turns) = I ÷ 4 × (4 + 3) = 7I / 4.

  According to the stator 2 configured as described above, the maximum number of turns of each unit coil can be reduced as compared with the stator having the winding structure of the comparative example shown in FIG. It can be made small, and the same effect as in the first embodiment can be obtained.

[Third embodiment]
In the third embodiment shown in FIGS. 10 and 11, the U-phase coil 5u is configured by connecting four coil arrays 5u1 ″, 5u2 ″, 5u3 ″, 5u4 ″ in parallel. The coil array 5u1 '' is configured by winding coils U1 to U6 in the same direction and connecting them in series. Similarly, the coil array 5u2 ″ is composed of coils U1 ′ to U6 ′, the coil array 5u3 ″ is composed of coils U1 ″ to U6 ″, and the coil array 5u4 ″ is composed of the coil U1 ′. It is comprised from '' -U6 '''.
One end of each starting coil U1, U1 ′, U1 ″, U1 ′ ″ of each coil row 5u1 ″, 5u2 ″, 5u3 ″, 5u4 ″ is connected to the power input terminal Pu, and each terminating coil U6 , U6 ′, U6 ″, U6 ′ ″ are connected to a neutral point terminal N at one end.

  The coil arrays 5u1 ″, 5u2 ″, 5u3 ″, and 5u4 ″ are all supplied with power from one end of each starting end coil. The coils U1 to U6 of the coil array 5u1 ″ and the coils U1 ′ to U6 ′ of the coil array 5u2 ″ all have the same polarity. Further, the coils U1 ″ to U6 ″ of the coil array 5u3 ″ and the coils U1 ′ ″ to U6 ′ ″ of the coil array 5u4 ″ all have the same polarity. The coils of the coil arrays 5u1 ″ and 5u2 ″ and the coils of the coil arrays 5u3 ″ and 5u4 ″ have opposite polarities.

  The coil arrays 5u1 ″ and 5u2 ″ and the coil arrays 5u3 ″ and 5u4 ″ having such a configuration are overlapped to constitute one unit coil between the upper and lower coils, and one unit coil. Are formed. Then, the coil arrays 5u1 ″ and 5u2 ″ and the coil arrays 5u3 ″ and 5u4 ″ are overlapped with each other in the vertical direction. Thereby, 12 unit coils A1-A6 and B1-B6 (refer FIG. 11) are comprised, and 12 magnetic poles are formed. The number of turns of each unit coil is all “7”.

  As shown in FIG. 11, 6 unit coils A1 to A6 configured by superimposing coil arrays 5u1 ″ and 5u2 ″, and 6 configured by superimposing coil arrays 5u3 ″ and 5u4 ″. The unit coils B <b> 1 to B <b> 6 are alternately arranged over the entire circumference of the stator core 4 so as to be alternately arranged without being adjacent in the circumferential direction. The polarities of the twelve unit coils A1 to A6 and B1 to B6 are alternately different.

Specifically, a unit coil A1 is composed of coils U1 and U1 ′, and similarly, unit coils A2,..., A6 are respectively composed of coils U2 and U2 ′,. These are arranged alternately every other clockwise. In addition, coils U1 ″ and U1 ′ ″, coils U2 ″ and U2 ′ ″,..., Coils U6 ″ and U6 ″ ′ are unit coils B1, B2,. These are formed and arranged alternately every other counterclockwise.
The V-phase coil 5v and the W-phase coil 5w are configured in the same manner as the U-phase coil 5u.

  FIG. 12 is a comparative example showing the winding structure of the stator coil for the third embodiment, and has the same output characteristics as the stator 2 of the third embodiment. In this configuration, four unit coils A1 ′ to A3 ′, B1 ′ to B3 ′, A4 ′ to A6 ′, and B4 ′ to B6 ′ are connected in series. It is connected to the. The unit coils of each coil row are alternately arranged so that they are not adjacent to each other, and the polarities of the unit coils are alternately different. The number of turns of each unit coil is “7” turns. If the current per phase is I [ampere], the ampere turn of each unit coil is I [ampere] / (number of parallel circuits) × (number of turns) = I ÷ 4 × 7 = 7I / 4. Similarly, the ampere turn of each unit coil of the third embodiment is also I [ampere] ÷ (number of parallel circuits) × (number of turns) = I ÷ 4 × (4 + 3) = 7I / 4.

  According to the stator 2 configured as described above, the maximum number of turns of each unit coil can be reduced as compared with the stator having the winding structure of the comparative example shown in FIG. It can be made small, and the same effect as in the first embodiment can be obtained.

[Fourth Embodiment]
In the fourth embodiment shown in FIGS. 13 and 14, the U-phase coil 5u includes four coil arrays 5u1 ′ ″, 5u2 ′ ″, 5u3 ′ ″, and 5u4 ′ ″ connected in parallel. Composed. The coil array 5u1 ′ ″ is configured by connecting coils U1 to U9 in series. Similarly, the coil array 5u2 ′ ″ is composed of coils U1 ′ to U9 ′, the coil array 5u3 ′ ″ is composed of coils U1 ″ to U9 ″, and the coil array 5u4 ′ ″ is The coils U1 ′ ″ to U9 ′ ″ are configured.

  The coils U1 to U3, U4 to U6, U7 to U9 of the coil array 5u1 '' ', the coils U3' to U5 ', U6' to U8 'of the coil array 5u2' '', and the coils of the coil array 5u3 '' ' U2 ″ to U4 ″, U5 ″ to U7 ″, coils U1 ′ ″ to U3 ′ ″, U4 ′ ″ to U6 ′ ″, U7 ′ ″ to U9 in the coil row 5u4 ′ ″ '' 'Is wound so as to be reversed.

One end of each starting coil U1, U1 ′, U1 ″, U1 ′ ″ of each coil row 5u1 ′ ″, 5u2 ′ ″, 5u3 ′ ″, 5u4 ′ ″ is connected to the power input terminal Pu, One end of each terminal coil U9, U9 ′, U9 ″, U9 ′ ″ is connected to the neutral point terminal N.
The coil arrays 5u1 ″ ′, 5u2 ′ ″, 5u3 ′ ″, and 5u4 ′ ″ are supplied with power from one end of each starting coil, and the coils U1 to U9, U1 ′ to U9 ′, U1. '' ˜U9 ″ and U1 ′ ″ ˜U9 ′ ″ have the same polarity between the upper and lower coils shown in FIG.

  The four coil arrays 5u1 ′ ″, 5u2 ′ ″, 5u3 ′ ″, and 5u4 ′ ″ having such a configuration are all overlapped so that one unit coil is configured by the coils corresponding to the upper and lower sides. At the same time, one magnetic pole is formed. Thereby, 12 unit coils C1-C6 and D1-D6 (refer FIG. 14) are comprised, and 12 magnetic poles are formed. Each unit coil is composed of three coils, and the number of turns of each unit coil is all “3”.

  As shown in FIG. 14, twelve unit coils C1 to C6 and D1 to D6 configured by superimposing coil arrays 5u1 ′ ″, 5u2 ′ ″, 5u3 ′ ″, and 5u4 ′ ″ Adjacent to the direction, the stator core 4 is arranged over the entire circumference. The polarities of the twelve unit coils C1 to C6 and D1 to D6 are alternately different.

Specifically, the unit coil C1 is formed by the coils U1, U1 ′, U1 ″, and similarly the coils U2, U2 ′, U1 ′ ″, the coils U3, U2 ″, U2 ′ ″, the coil U3 ′, U3 ″, U3 ′ ″, coils U4, U4 ′, U4 ″, coils U5, U5 ′, U4 ′ ″, coils U6, U5 ″, U5 ′ ″, coils U6 ′, U6 '', U6 ′ ″, coils U7, U7 ′, U7 ″, coils U8, U8 ′, U7 ″ ′, coils U9, U8 ″, U8 ′ ″, coils U9 ′, U9 ″, U9 '''Forms unit coils D1, C2, D2, C3, D3, C4, D4, C5, D5, C6, and D6, which are sequentially arranged in the clockwise direction.
The V-phase coil 5v and the W-phase coil 5w are configured in the same manner as the U-phase coil 5u.

  FIG. 15 is a comparative example showing the winding structure of the stator coil for the fourth embodiment, and has the same output characteristics as the stator 2 of the fourth embodiment. In this configuration, twelve unit coils C1 ′ to C6 ′ and D1 ′ to D6 ′ are connected in parallel. One end of each of the twelve unit coils C1 ′ to C6 ′ and D1 ′ to D6 ′ is connected to the power input terminal Pu, and the other end is connected to the neutral point terminal N. The number of turns of each unit coil is all “9”. Assuming that the current per phase is I [ampere], the ampere turn of each unit coil is I [ampere] ÷ (number of parallel circuits) × (number of turns) = I ÷ 12 × 9 = 9I / 12 = 3I / 4 It becomes. Similarly, the ampere turn of each unit coil of the fourth embodiment is I [ampere] ÷ (number of parallel circuits) × (number of turns) = I ÷ 4 × (1 + 1 + 1) = 3I / 4.

  According to the stator 2 having the above-described configuration, the maximum number of turns of each unit coil can be reduced as compared with the stator having the winding structure of the comparative example shown in FIG. It can be made small, and the same effect as in the first embodiment can be obtained.

Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention.
In the above embodiment, the case of 12 poles has been described, but the number of magnetic poles such as 8 poles and 16 poles may be changed as appropriate. Further, as described above, the number of turns of each unit coil may be changed as appropriate.
Further, the number of turns of the coils constituting each coil row may be appropriately changed. For example, each coil row may be constituted by coils having different numbers of turns.
These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

The stator coil of the above embodiment is configured based on the relational expression shown below. First, it is assumed that m coil arrays are connected in parallel, and each coil array is composed of k coils connected in series.
The number of turns of the k coils in the first coil array among the m coil arrays is n _1,1 , n _1,2 ,..., N _{1, k−1} , n _{1, k.} The number of turns of the k coils of the second coil array is n _2,1 , n _2,2 ,..., N _{2, k−1} , n _{2, k} ,. The number of turns of the k coils in the coil array is n _m−1,1 , n _1,2 ,..., N _{m−1, k−1} , n _{m−1, k} , and the m th coil array. It is assumed that the number of turns of the k coils can be expressed as _{nm, 1} , _{nm, 2} ,..., _{Nm, k-1} , _{nm, k} .
At this time, the number of turns of each coil is in the relationship shown in the following equation. However, m ≧ 2.

Equation (1) represents that in the m coil arrays, the sum of the number of turns of the k coils constituting each coil array is equal.
Equation (2) represents that the sum of the number of turns of the k-th coils in each of the m coil arrays is equal. That is, the number of turns of each unit coil described above is equal.

According to the stator of the present embodiment configured based on such a conditional expression, each unit coil is composed of two or more coils, so each unit coil of the comparative example is composed of one coil. The maximum potential difference in each unit coil can be reduced as compared with the winding structure stator. As a result, the in-phase insulation performance can be ensured and high voltage can be accommodated.
According to the rotating electrical machine having the stator configured based on the above conditional expression, since the in-phase insulation performance can be secured, there is no need to reinforce the insulator, and the stator corresponding to high voltage is provided. Therefore, it is possible to reduce the size and increase the output.

  In the drawings, 1 is a permanent magnet motor (rotary electric machine), 2 is a stator, 3 is a rotor, 4 is a stator core, 5 is a stator coil, 5u is a U phase coil, 5v is a V phase coil, and 5w is W. Phase coils, 5u1, 5u2, 5u1 ′ to 5u4 ′, 5u1 ″ to 5u4 ″, 5u1 ′ ″ to 5u4 ′ ″ are coil arrays, U1 to U12, U1 ′ to U12 ′, U1 ″ to U9 ′. ', U1' '' to U9 '' 'are coils, A1 to A6, A1' to A6 ', B1 to B6, B1' to B6 ', C1 to C6, C1' to C6 ', D1 to D6, D1' D6 'is a unit coil, Pu, Pv, and Pw are power input terminals, and N is a neutral point terminal.

Claims (4)

In a stator of a rotating electrical machine in which a plurality of stator coils formed by connecting a plurality of unit coils are wound around a stator core,
The stator coils of each phase are configured by connecting a plurality of coil arrays formed by connecting a plurality of coils in series to the power input terminals of the respective phases, and the number of turns of the plurality of coil arrays is equal. Is set to
The plurality of unit coils of each phase are configured by combining coils of two or more coil arrays out of the plurality of coil arrays, and are set so that the number of turns is equal. Stator.   2. The rotating electric machine according to claim 1, wherein when the number of turns of the unit coil is an odd number, the number of turns of at least some of the plurality of coils of each coil row is set to be different. Child.   2. The stator of a rotating electrical machine according to claim 1, wherein when the number of turns of the unit coil is an even number, the number of turns of the plurality of coils in each coil row is set to be equal. The stator according to any one of claims 1 to 3,
A rotating electrical machine comprising: a rotor disposed in a field space of the stator.

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