Rotating electrical machine

Abstract

A rotary electric machine is provided. The rotary electric machine (1) includes a winding switching device (10) that can miniaturize a wire. The rotary electric machine (1) includes a stator including a stator core and a plurality of winding groups, a first wiring member group (71) and a second wiring member group (72) arranged along a circumferential direction of the stator core, and a winding switching device (10) that switches connections of the plurality of winding groups. The second wiring member group (72) is arranged at a position opposite to the first wiring member group (71). The plurality of winding groups include a first winding group and a second winding group each formed by a U-phase winding (221, 231), a V-phase winding (222, 232), and a W-phase winding (223, 233). The first wiring member group (71) connected to the first winding group includes six wiring members, and the second wiring member group (72) connected to the second winding group includes four wiring members. The U-phase winding (231), the V-phase winding (232), and the W-phase winding (233) of the second winding group are connected to a common wiring member (72d).

Description

Technical Field

[0001] This disclosure relates to a rotary electric motor equipped with a winding switching device. Background Technology

[0002] Conventional rotary motors that switch winding connections have two winding switching devices for switching winding connections. The connection of the terminals is changed by the winding switching devices, thereby switching the series connection and parallel connection of the windings (see, for example, Patent Document 1).

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2015-104191 Summary of the Invention

[0006] The problem the invention aims to solve

[0007] Typically, conductive wiring components are used to connect the windings to the winding switching device. In the aforementioned conventional rotary electric machines, wiring components are connected to both ends of each winding and then to the winding switching device, thus requiring a large number of wiring components. Therefore, in rotary electric machines equipped with winding switching devices, there is a problem of increased wiring size.

[0008] This disclosure was made to solve the above-mentioned problems, and its purpose is to provide a rotary motor with a winding switching device that enables miniaturization of wiring.

[0009] means for solving problems

[0010] The rotary electric machine disclosed herein comprises: a stator having an annular stator core and a plurality of opposing winding groups; a first winding member group arranged circumferentially along the stator core; a second winding member group disposed opposite to the first winding member group and arranged circumferentially along the stator core; and a winding switching device for switching the connection of the plurality of winding groups, wherein the plurality of winding groups includes a first winding group and a second winding group, the first winding group being formed by a first U-phase winding, a first V-phase winding, and a first W-phase winding arranged circumferentially, the first... The second winding group is formed by a second U-phase winding, a second V-phase winding, and a second W-phase winding arranged circumferentially, and is positioned opposite the first winding group. The first wiring member group includes a first wiring member connected to one end of the first U-phase winding, a second wiring member connected to the other end of the first U-phase winding, a third wiring member connected to one end of the first V-phase winding, a fourth wiring member connected to the other end of the first V-phase winding, a fifth wiring member connected to one end of the first W-phase winding, and a sixth wiring member connected to the other end of the first W-phase winding. The wiring components, namely the first, third, and fifth wiring components, are electrically connected to the power supply. The second group of wiring components includes a seventh wiring component connected to one end of the 2U phase winding, an eighth wiring component connected to one end of the 2V phase winding, a ninth wiring component connected to one end of the 2W phase winding, and a common wiring component connected to the other ends of the 2U phase winding, the 2V phase winding, and the 2W phase winding. The winding switching device connects the first wiring component to the seventh wiring component and connects the third wiring component to the eighth wiring component. The components are connected by connecting the 5th and 9th connecting components, and connecting the 2nd, 4th, and 6th connecting components to the common connecting component, thereby connecting the 1st winding group and the 2nd winding group in parallel. The winding switching device connects the 2nd connecting component to the 7th connecting component, connects the 4th connecting component to the 8th connecting component, connects the 6th connecting component to the 9th connecting component, and sets the 2nd, 4th, and 6th connecting components to the common connecting component as non-connected, thereby connecting the 1st winding group and the 2nd winding group in series.

[0011] The effects of the invention

[0012] The rotary motor with winding switching device disclosed herein enables miniaturization of wiring. Attached Figure Description

[0013] Figure 1 This is an end view of the rotary motor in Embodiment 1.

[0014] Figure 2 This is the AA′ cross-sectional view in Implementation Method 1.

[0015] Figure 3 This is a cross-sectional view of BB′ in Implementation Method 1.

[0016] Figure 4 This is a diagram showing the connection between the wiring components and each phase winding in Embodiment 1.

[0017] Figure 5 This is the wiring diagram of the winding switching device in Implementation Method 1.

[0018] Figure 6 This is a circuit diagram of the first winding group and the second winding group in Implementation Method 1.

[0019] Figure 7 This is the wiring diagram of the winding switching device in Implementation Method 1.

[0020] Figure 8 This is a circuit diagram of the first winding group and the second winding group in Implementation Method 1.

[0021] Figure 9 This is an end view of the rotary motor in Embodiment 1.

[0022] Figure 10 This is a BB' cross-sectional view showing a variation of embodiment 1.

[0023] Figure 11 This is a cross-sectional view of BB′ in Implementation Method 2.

[0024] Figure 12 This is a diagram showing the connection between the wiring components and each phase winding in Embodiment 2.

[0025] Figure 13 This is the wiring diagram of the winding switching device in Implementation Method 2.

[0026] Figure 14 This is a circuit diagram of the first winding group and the second winding group in Embodiment 2.

[0027] Figure 15 This is the wiring diagram of the winding switching device in Implementation Method 2.

[0028] Figure 16 This is a circuit diagram of the first winding group and the second winding group in Embodiment 2.

[0029] Explanation of reference numerals in the attached figures

[0030] 1 Rotary motor; 2 Stator; 21 Stator core; 22 First winding group; 221 First U-phase winding; 222 First V-phase winding; 223 First W-phase winding; 23 Second winding group; 231 Second U-phase winding; 232 Second V-phase winding; 233 Second W-phase winding; 71 First connecting component group; 71a First connecting component; 71b Second connecting component; 71c Third connecting component; 71d Fourth connecting component; 71e Fifth connecting component; 71f Sixth connecting component; 72 Second connecting component group; 72a Seventh connecting component; 72b Eighth connecting component; 72c Ninth connecting component; 72d Common connecting component; 10 Winding switching device. Detailed Implementation

[0031] Implementation method 1.

[0032] The rotary motor 1 of Embodiment 1 will now be described in detail. Furthermore, the same reference numerals in each figure indicate the same or equivalent structures. Figure 1 An end view of the rotary motor 1 is shown. (As shown) Figure 1 As shown, the rotary electric motor 1 has a housing 4 and a rotating shaft 6 rotatably supported on the housing 4 via a pair of bearings 5. A rotor 3 is fixed to the rotating shaft 6. The rotor 3 has a cylindrical rotor core 31 as a magnetic body and permanent magnets 32 disposed around the rotor core 31. A stator 2 is disposed around the rotor 3. The stator 2 has an annular stator core 21 (described later) and multiple winding groups. A first wiring member group 71 and a second wiring member group 72 are disposed at a different height from the stator 2 along the rotation shaft 6. Circumferential direction refers to the direction along the annulus of the stator core 21.

[0033] Figure 2 A cross-sectional view of the rotary electric motor, AA′, is shown. Figure 2 As shown, the stator 2 has an annular stator core 21 and multiple winding groups. The multiple winding groups include a first winding group 22 and a second winding group 23, as described below. Multiple teeth 21a extending toward the rotation axis 6 are provided on the inner circumference of the stator core 21. Coils 11a-1 are wound centrally on each tooth 21a.

[0034] The first winding group 22 is formed by the first U-phase winding 221, the first V-phase winding 222, and the first W-phase winding 223 arranged circumferentially. The first U-phase winding 221 is composed of coils 11a and 11b connected in parallel. The first V-phase winding 222 is composed of coils 11c and 11d connected in parallel. The first W-phase winding 223 is composed of coils 11e and 11f connected in parallel.

[0035] The second winding group 23 is formed by the second U-phase winding 231, the second V-phase winding 232, and the second W-phase winding 233 arranged circumferentially, and is positioned opposite the first winding group 22. The second U-phase winding 231 consists of coils 11g and 11h connected in parallel. The second V-phase winding 232 consists of coils 11i and 11j connected in parallel. The second W-phase winding 233 consists of coils 11k and 11l connected in parallel.

[0036] Figure 3 A BB′ cross-sectional view of a rotary electric motor is shown. (See figure) Figure 3 As shown, the first wiring member group 71 is arranged on the arc on which the first winding group 22 is arranged and along the circumference of the stator core 21. The second wiring member group 72 is arranged on the arc on which the second winding group 23 is arranged and along the circumference of the stator core 21. The first wiring member group 71 and the second wiring member group 72 are supported by a plurality of support members 12 and are arranged at a different height from the stator 2 in the direction of the rotation axis 6.

[0037] The first wiring component group 71 comprises six wiring components 71a, 71b, 71c, 71d, 71e, and 71f. The second wiring component group 72 comprises four wiring components 72a, 72b, 72c, and 72d. Wiring components 71a, 71b, 71c, 71d, 71e, and 71f, and wiring components 72a, 72b, 72c, and 72d are strip conductors, formed in a generally semi-circular shape. For example, they are formed by integrally coating the busbar with resin.

[0038] The arrangement width of the four wiring members 72a, 72b, 72c, and 72d in the second wiring member group 72, i.e., the distance from the inner periphery of the ninth wiring member 72c to the outer periphery of the common wiring member 72d, is shorter than the arrangement width of the six wiring members 71a, 71b, 71c, 71d, 71e, and 71f in the first wiring member group 71, i.e., the distance from the inner periphery of the first wiring member 71a to the outer periphery of the sixth wiring member 71f. Furthermore, the spacing between the wiring members 72a, 72b, 72c, and 72d in the second wiring member group 72 and their adjacent wiring members is wider than the spacing between the wiring members 71a, 71b, 71c, 71d, 71e, and 71f in the first wiring member group 71 and their adjacent wiring members. Specifically, for example, the spacing between the 7th wiring member 72a of the second wiring member group 72 and the adjacent 8th wiring member 72b is wider than the spacing between the 1st wiring member 71a of the first wiring member group 71 and the adjacent 3rd wiring member 71c.

[0039] The first wiring member 71a has a terminal U1. The second wiring member 71b has a terminal UN. The third wiring member 71c has a terminal V1. The fourth wiring member 71d has a terminal VN. The fifth wiring member 71e has a terminal W1. The sixth wiring member 71f has a terminal WN. The seventh wiring member 72a has a terminal U2. The eighth wiring member 72b has a terminal V2. The ninth wiring member 72c has a terminal W2. The common wiring member 72d has a terminal N. Hereinafter, without distinguishing between terminals U1, V1, W1, UN, VN, WN, U2, V2, W2, and N, they will be referred to as terminal 8. Terminal 8 is connected to the winding switching device 10 described later.

[0040] use Figure 4 The connections between the first wiring component group 71 and the first winding group 22, and between the second wiring component group 72 and the second winding group 23, will be explained. First, the connection between the first wiring component group 71 and the first winding group 22 will be explained. A first wiring component 71a is connected to one end of the first U-phase winding 221, and a second wiring component 71b is connected to the other end. A third wiring component 71c is connected to one end of the first V-phase winding 222, and a fourth wiring component 71d is connected to the other end. A fifth wiring component 71e is connected to one end of the first W-phase winding 223, and a sixth wiring component 71f is connected to the other end.

[0041] Next, the connection between the second wiring member group 72 and the second winding group 23 will be described. A seventh wiring member 72a is connected to one end of the 2U phase winding 231. An eighth wiring member 72b is connected to one end of the 2V phase winding 232. A ninth wiring member 72c is connected to one end of the 2W phase winding 233. The other ends of the 2U phase winding 231, the 2V phase winding 232, and the 2W phase winding 233 are connected to a common wiring member 72d.

[0042] The winding switching device 10 is a device for switching the parallel connection and series connection of the first winding group 22 and the second winding group 23. For example, it is a junction box or switch with a terminal block, arranged adjacent to the housing 4.

[0043] use Figure 5 , 6 The case where the winding switching device 10 connects the first winding group 22 and the second winding group 23 in parallel will be explained. For example... Figure 5 As shown, terminal U1 of the first wiring member 71a, terminal V1 of the third wiring member 71c, and terminal W1 of the fifth wiring member 71e are electrically connected to a power supply. For example, terminals U1, V1, and W1 are connected to power lines U, V, and W, which supply three-phase AC current from an external inverter (not shown). Furthermore, the electrical connection method is not limited to the examples described above, as long as the electrical connection can be ensured.

[0044] In the winding switching device 10, terminals U1 and U2, V1 and V2, and W1 and W2 are connected by switching wires or switches. Terminals UN, VN, and WN are connected to terminal N by switching wires or switches, thereby short-circuiting the three phases. When terminal 8 is connected in this way, as... Figure 6 As shown, they become a parallel connection.

[0045] use Figure 7 , 8 The case where the first winding group 22 and the second winding group 23 are connected in series in the winding switching device 10 will be explained. For example... Figure 7 As shown, similar to the parallel connection, terminals U1, V1, and W1 are connected to power lines U, V, and W. Terminal UN is connected to terminal U2, terminal VN to terminal V2, and terminal WN to terminal W2 by switching via wires or switches. At this time, terminals UN, VN, and WN are not connected to terminal N. When terminal 8 is connected in this way, as... Figure 8 As shown, they become a series connection.

[0046] Next, the rotational speed and torque of the rotary electric machine 1 configured in this way will be explained. Hereinafter, each phase winding refers to the U-phase winding, V-phase winding, and W-phase winding. That is, the phase windings of the first winding group 22 refer to the first U-phase winding 221, the first V-phase winding 222, and the first W-phase winding 223, and the phase windings of the second winding group 23 refer to the second U-phase winding 231, the second V-phase winding 232, and the second W-phase winding 233.

[0047] First, the rotational speed and torque when the first winding group 22 and the second winding group 23 are connected in parallel will be explained. Each phase winding of the first winding group 22 and each phase winding of the second winding group 23 consists of two coils 11a-l connected in parallel. Therefore, as Figure 6As shown, when the first U-phase winding 221 and the second U-phase winding 231 are connected in parallel, the circuit consists of two coils 11a and 11b of the first U-phase winding 221 and two coils 11g and 11h of the second U-phase winding 231 connected in parallel. Therefore, one-quarter of the current supplied from the power line flows in each coil 11a, 11b, 11g, and 11h. Furthermore, a total voltage is applied to each coil 11a, 11b, 11g, and 11h. Similarly, for the first V-phase winding 222 and the second V-phase winding 232, and for the first W-phase winding 223 and the second W-phase winding 233, one-quarter of the current supplied from the power line flows in each coil 11c, 11d, 11e, 11f, 11i, 11j, 11k, and 11l, and a total voltage is applied. When the voltage applied to coils 11a-l increases, the rotational speed of the rotary motor 1 increases. Therefore, when the total voltage applied to coils 11a-l is increased, the rotational speed of the rotary motor 1 reaches its maximum. Thus, when the first winding group 22 and the second winding group 23 are connected in parallel, the rotary motor 1 can rotate at high speed. However, when the current flowing in coils 11a-l decreases, the torque of the rotary motor 1 decreases, and therefore, the torque is smaller compared to the series connection described later.

[0048] Next, the rotational speed and torque when the first winding group 22 and the second winding group 23 are connected in series will be explained. Figure 8 When the first U-phase winding 221 and the second U-phase winding 231 are connected in series, it becomes a circuit formed by connecting two coils 11a and 11b connected in parallel and two coils 11g and 11h connected in parallel in series. Therefore, half of the current supplied from the power line flows in each coil 11a, 11b, 11g, and 11h. In addition, half of the total voltage is applied to each coil 11a, 11b, 11g, and 11h. Similarly, for the first V-phase winding 222 and the second V-phase winding 232, as well as the first W-phase winding 223 and the second W-phase winding 233, half of the current supplied from the power line flows in each coil 11c, 11d, 11e, 11f, 11i, 11j, 11k, and 11l, and half of the total voltage is applied. When the current flowing in coils 11a-l increases, the torque of the rotary motor 1 increases, thus generating a larger torque compared to the parallel connection. That is, without considering the effect of torque saturation, it can generate approximately twice the torque of the parallel connection. However, the voltage is lower compared to the parallel connection, therefore, the rotational speed of the rotary motor 1 becomes lower.

[0049] The connection between the first winding group 22 and the second winding group 23 in the winding switching device 10 can also be changed manually by altering the wire connection at the connection terminal 8. For example, when the rotary motor 1 of this embodiment is used as the traction machine of an elevator system, during an emergency stop test conducted at the completion of a building to verify safety, the first winding group 22 and the second winding group 23 are connected in series, and in subsequent operation, they are connected in parallel. In this case, since the connection is switched only once, the switching method described above can be used. Alternatively, a manual switch can be provided at the terminal 8 to switch the connection. Furthermore, when an electromagnetic contactor is used as the winding switching device 10, the connection can be switched more easily by providing a control device to control the electromagnetic contactor. In this case, a resistance meter is provided to measure the resistance values ​​of the first winding group 22 and the second winding group 23, and the control device determines the connection status based on the resistance meter value. For example, by outputting the determined connection status to the display screen, the operator can easily identify the connection status.

[0050] As described above, the circuit in which the first winding group 22 and the second winding group 23 are connected in parallel or in series is Y-connected. Therefore, if the impedances of coils 11a-l are equal and in a balanced state, the current flowing in the common connection member 72d with terminal N is 0A. Furthermore, even if it is not a completely balanced state and current flows in the common connection member 72d, this current is smaller than the current flowing in other connection members. Therefore, the common connection member 72d can be a thinner component than the other connection members. In other words, the cross-sectional area of ​​the common connection member 72d can be smaller than the cross-sectional area of ​​the other connection members. The other connection members referred to here are connection members 71a, 71b, 71c, 71d, 71e, 71f and connection members 72a, 72b, 72c, which will be referred to as other connection members below.

[0051] In addition, such as Figure 3 As shown, the first wiring component group 71 has six wiring components 71a, 71b, 71c, 71d, 71e, and 71f, while the second wiring component group 72 has four wiring components 72a, 72b, 72c, and 72d. The second wiring component group 72 has fewer wiring components than the first wiring component group 71, which increases the spacing between wiring components 72a, 72b, 72c, and 72d and adjacent wiring components. With this structure, when both the first wiring component group 71 and the second wiring component group 72 generate heat in the same way, the second wiring component group 72 dissipates heat more easily.

[0052] For example, if a temperature bias occurs in the rotary motor 1 due to the shape of the housing 4, by arranging the second wiring member group 72 on the side of the rotary motor 1 where the heat generation is greater and the first wiring member group 71 on the side of the rotary motor 1 where the heat generation is less, the overall temperature of the rotary motor 1 can be made to be nearly uniform.

[0053] For example, such as Figure 9 As shown, when a rotary motor 1, with a first wiring component group 71 positioned below and a second wiring component group 72 positioned above, is mounted on a mounting platform 13 made of a thermally conductive material, heat generated by the first wiring component group 71 and the second wiring component group 72 tends to remain at the top. That is, when current flows through the first wiring component group 71 and the second wiring component group 72, the temperature above the rotary motor 1 increases. However, as described above, the second wiring component group 72 has a structure that facilitates heat dissipation, thus allowing the heat remaining above the rotary motor 1 to dissipate. Furthermore, the heat generated by the first wiring component group 71 is dissipated to the outside of the rotary motor 1 via the mounting platform 13 made of a thermally conductive material. Therefore, the overall temperature of the rotary motor 1 can be made nearly uniform. Thus, localized heat dissipation of the rotary motor 1 is suppressed, and the rotary motor 1 is less prone to malfunction.

[0054] In the rotary motor 1 of this embodiment 1, the other ends of the second U-phase winding 231, the second V-phase winding 232, and the second W-phase winding 233 are connected to a common connection member 72d. The current flowing in the common connection member 72d is smaller than the current flowing in the other connection members; therefore, only one common connection member 72d can be used. By configuring it in this way, the number of connection members in the second connection member group 72 can be reduced. Therefore, the arrangement width of the four connection members 72a, 72b, 72c, and 72d of the second connection member group 72 can be smaller than the arrangement width of the six connection members 71a, 71b, 71c, 71d, 71e, and 71f of the first connection member group 71. Therefore, the space for accommodating the second connection member group 72 within the rotary motor 1 can be reduced, and the wiring of the rotary motor 1 equipped with the winding switching device 10 can be miniaturized.

[0055] Furthermore, in the rotary motor 1 of Embodiment 1, the first wiring member group 71 is arranged on the arc on which the first winding group 22 is arranged, that is, arranged circumferentially, and the second wiring member group 72 is arranged on the arc on which the second winding group 23 is arranged, that is, arranged circumferentially. By arranging them in this way, the distance from the first winding group 22 to the first wiring member group 71 and the distance from the second winding group 23 to the second wiring member group 72 are shortened, and the length of the wires connecting them can be shortened. Therefore, the wiring can be miniaturized.

[0056] Furthermore, in the rotary motor 1 of Embodiment 1, the cross-sectional area of ​​the common wiring member 72d can be made smaller than that of the other wiring members. Therefore, the space occupied by the common wiring member 72d is reduced, allowing for more compact wiring in the second wiring member group 72. Moreover, by making the cross-sectional area of ​​the common wiring member 72d smaller, the spacing between wiring members 72a, 72b, 72c, and 72d and adjacent wiring members can be increased. Therefore, the heat dissipation effect of the second wiring member group 72 can be further improved.

[0057] Furthermore, in the rotary motor 1 of Embodiment 1, the second wiring member group 72 is disposed at a location where the temperature is higher than that of the location where the first wiring member group 71 is disposed. The second wiring member group 72 has fewer wiring members than the first wiring member group 71. Therefore, the second wiring member group 72 dissipates heat more easily. Thus, by distributing the second wiring member group 72 at a higher temperature, even if temperature deviations occur in the rotary motor 1, the overall temperature of the rotary motor 1 can be made nearly uniform. Therefore, localized overheating of the rotary motor 1 is suppressed, and the rotary motor 1 is less prone to failure.

[0058] Furthermore, in the rotary motor 1 of Embodiment 1, the spacing between the wiring members 72a, 72b, 72c, and 72d of the second wiring member group 72 and their adjacent wiring members is wider than the spacing between the wiring members 71a, 71b, 71c, 71d, 71e, and 71f of the first wiring member group 71 and their adjacent wiring members. With this structure, the second wiring member group 72 dissipates heat more easily. Therefore, even if temperature deviations occur in the rotary motor 1, the overall temperature of the rotary motor 1 can be made nearly uniform. Thus, localized overheating of the rotary motor 1 is suppressed, and the rotary motor 1 is less prone to failure.

[0059] Furthermore, while an example of coils 11a-l being concentrated and wound in the tooth section 21a has been described, they can also be wound in a distributed manner. In addition, the coils 11a-l constituting each phase winding of the first winding group 22 and each phase winding of the second winding group 23 can be one or more.

[0060] Furthermore, examples of wiring components 71a, 71b, 71c, 71d, 71e, 71f and wiring components 72a, 72b, 72c, 72d being strip conductors have been described, but they could also be linear conductors such as wires. Moreover, the shape of these wiring components is not limited to a generally semi-circular shape. For example, they could also be as follows: Figure 10 The lengths of these wiring components are adjusted by considering the connection to each phase winding as shown.

[0061] In addition, an example of a single strip conductor being formed for the common wiring component 72d has been described, but multiple strip conductors can also be connected to form a single strip conductor.

[0062] In addition, an example in which the winding switching device 10 is arranged adjacent to the housing 4 has been described, but the winding switching device 10 can also be arranged in a position separate from the housing 4, and the terminal 8 can be connected to the winding switching device 10 by wire.

[0063] In the rotary motor 1 configured in this way, the other ends of the second U-phase winding 231, the second V-phase winding 232, and the second W-phase winding 233 are also connected to the common connection member 72d. The current flowing in the common connection member 72d is smaller than the current flowing in the other connection members; therefore, only one common connection member 72d can be used. This reduces the number of connection members in the second connection member group 72. Consequently, the arrangement width of the four connection members 72a, 72b, 72c, and 72d of the second connection member group 72 can be shorter than the arrangement width of the six connection members 71a, 71b, 71c, 71d, 71e, and 71f of the first connection member group 71. Therefore, the space for housing the second connection member group 72 within the rotary motor 1 can be reduced, and the wiring of the rotary motor 1 equipped with the winding switching device 10 can be miniaturized.

[0064] Implementation method 2.

[0065] In Embodiment 1, an example with one winding switching device 10 was described, but in Embodiment 2, an example with two winding switching devices 10 is described. Specifically, the number of terminals in the second wiring member group 72 and the switching between parallel and series connections in the winding switching device 10 are different from those in Embodiment 1. Therefore, the differences will be explained below.

[0066] The first wiring component group 71 has the same terminals as in Embodiment 1. (Usage) Figure 11 The terminals of the second wiring member group 72 will be described. The seventh wiring member 72a has terminals U2a and U2b. The eighth wiring member 72b has terminals V2a and V2b. The ninth wiring member 72c has terminals W2a and W2b. The common wiring member 72d has terminal N in the same manner as in Embodiment 1. Hereinafter, terminals U1, V1, W1, U2a, V2a, and W2a will be referred to as terminal 8 without distinction, and terminals UN, VN, WN, U2b, V2b, W2b, and N will be referred to as terminal 9 without distinction. Terminal 8 is connected to the first winding switching device 10a described later, and terminal 9 is connected to the second winding switching device 10b described later.

[0067] like Figure 12 As shown, the connection between the first wiring component group 71 and the first winding group 22, and the connection between the second wiring component group 72 and the second winding group 23 are the same as in Embodiment 1.

[0068] The first winding switching device 10a and the second winding switching device 10b are structures equivalent to the winding switching device 10 in Embodiment 1, and are devices for switching the parallel connection and series connection of the first winding group 22 and the second winding group 23. For example, the first winding switching device 10a and the second winding switching device 10b are junction boxes or switches with terminal plates, arranged adjacent to the housing 4. The first winding switching device 10a is provided in a position opposite to the second winding switching device 10b. That is, when the rotation shaft 6 is set as the center and the position of the first winding switching device 10a is set to 0 degrees, the second winding switching device 10b is provided at a position of 180 degrees.

[0069] use Figure 13 , 14 The case where the first winding switching device 10a and the second winding switching device 10b are configured to connect the first winding group 22 and the second winding group 23 in parallel will be explained. For example... Figure 13 As shown, terminals U1 of the first wiring member 71a, V1 of the third wiring member 71c, and W1 of the fifth wiring member 71e, which are connected to the first winding switching device 10a, are electrically connected to a power supply. For example, terminals U1, V1, and W1 are connected to power lines U, V, and W, which supply three-phase alternating current from an external inverter (not shown).

[0070] In the first winding switching device 10a, terminals U1 and U2a, V1 and V2a, and W1 and W2a are connected by switching via wires or switches. In the second winding switching device 10b, terminals UN, VN, WN, and terminal N are connected via wires, thereby short-circuiting the three phases. When terminals 8 and 9 are connected in this way, as... Figure 14 As shown, they become a parallel connection.

[0071] use Figure 15 , 16 The cases where the first winding switching device 10a and the second winding switching device 10b are configured with the first winding group 22 and the second winding group 23 connected in series will be explained. For example... Figure 15As shown, similar to the parallel connection case, terminals U1, V1, and W1 connected to the first winding switching device 10a are connected to power lines U, V, and W. At this time, terminals U1 and U2a, V1 and V2a, and W1 and W2a of the first winding switching device 10a are not connected. In the second winding switching device 10b, terminals UN and U2b, VN and V2b, and WN and W2b are connected by switching wires or switches, etc. At this time, terminals UN, VN, and WN are not connected to terminal N. When terminals 8 and 9 are connected in this way, as... Figure 16 As shown, they become a series connection.

[0072] In the rotary motor 1 configured as shown in Embodiment 2, the other ends of the second U-phase winding 231, the second V-phase winding 232, and the second W-phase winding 233 are also connected to the common connection member 72d. The current flowing in the common connection member 72d is smaller than the current flowing in the other connection members; therefore, only one common connection member 72d can be used. This reduces the number of connection members in the second connection member group 72. Consequently, the arrangement width of the four connection members 72a, 72b, 72c, and 72d of the second connection member group 72 can be shorter than the arrangement width of the six connection members 71a, 71b, 71c, 71d, 71e, and 71f of the first connection member group 71. Therefore, the space for housing the second connection member group 72 within the rotary motor 1 can be reduced, and the wiring of the rotary motor 1 equipped with the winding switching device 10 can be miniaturized.

[0073] Furthermore, in the rotary motor 1 of Embodiment 2, the number of terminals connected to the first winding switching device 10a and the second winding switching device 10b is less than that of the winding switching device 10 in Embodiment 1. Therefore, small junction boxes or switches can be used for the first winding switching device 10a and the second winding switching device 10b.

[0074] Furthermore, while an example has been described where the first winding switching device 10a is positioned opposite the second winding switching device 10b, the configuration of the first winding switching device 10a and the second winding switching device 10b can also be determined based on the shape of the housing 4 or the surrounding environment where the rotary motor 1 is installed. Additionally, it is also possible to follow... Figure 9 The rotary motor 1 of Embodiment 2 is mounted on the mounting platform 13 in that orientation. In this case, the second wiring component group 72 can also be positioned in a relatively low-temperature area, so that the temperature of the rotary motor 1 as a whole is nearly uniform.

Claims

1. A rotary electric motor comprising: a stator having an annular stator core and a plurality of winding groups; a first group of connecting members arranged circumferentially along the stator core; a second group of connecting members disposed at a position such that the inner periphery of the second group of connecting members is radially opposite to the inner periphery of the first group of connecting members in the stator core, and arranged circumferentially along the stator core; and a winding switching device for switching the connection of the plurality of winding groups, wherein... The plurality of winding groups includes a first winding group and a second winding group. The first winding group is formed by a first U-phase winding, a first V-phase winding, and a first W-phase winding arranged circumferentially. The second winding group is formed by a second U-phase winding, a second V-phase winding, and a second W-phase winding arranged circumferentially. The second U-phase winding is positioned radially opposite to the first U-phase winding. The second V-phase winding is positioned radially opposite to the first V-phase winding. The second W-phase winding is positioned radially opposite to the first W-phase winding. The first wiring component group includes a first wiring component connected to one end of the first U-phase winding, a second wiring component connected to the other end of the first U-phase winding, a third wiring component connected to one end of the first V-phase winding, a fourth wiring component connected to the other end of the first V-phase winding, a fifth wiring component connected to one end of the first W-phase winding, and a sixth wiring component connected to the other end of the first W-phase winding. The first, third, and fifth wiring components are electrically connected to a power supply. The second wiring component group includes a seventh wiring component connected to one end of the second U-phase winding, an eighth wiring component connected to one end of the second V-phase winding, a ninth wiring component connected to one end of the second W-phase winding, and a common wiring component connected to the other ends of the second U-phase winding, the second V-phase winding, and the second W-phase winding. The winding switching device connects the first connecting member to the seventh connecting member, the third connecting member to the eighth connecting member, the fifth connecting member to the ninth connecting member, and the second, fourth, and sixth connecting members to the common connecting member, thereby connecting the first winding group and the second winding group in parallel. The winding switching device connects the second connecting member to the seventh connecting member, the fourth connecting member to the eighth connecting member, and the sixth connecting member to the ninth connecting member, while disconnecting the second, fourth, and sixth connecting members from the common connecting member, thereby connecting the first winding group and the second winding group in series. The parallel connection of the first winding group and the second winding group includes: the first U-phase winding and the second U-phase winding connected in parallel; the first V-phase winding and the second V-phase winding connected in parallel; and the first W-phase winding and the second W-phase winding connected in parallel. The series connection of the first winding group and the second winding group includes: the first U-phase winding and the second U-phase winding are connected in series, the first V-phase winding and the second V-phase winding are connected in series, and the first W-phase winding and the second W-phase winding are connected in series.

2. The rotary motor according to claim 1, wherein, The first wiring component group is arranged opposite the first winding group in an axial direction orthogonal to the radial direction. The second wiring component group is arranged opposite to the second winding group in the axial direction.

3. The rotary motor according to claim 1, wherein, The cross-sectional area of ​​the common wiring component is smaller than the cross-sectional area of ​​the first wiring component, the second wiring component, the third wiring component, the fourth wiring component, the fifth wiring component, the sixth wiring component, the seventh wiring component, the eighth wiring component, and the ninth wiring component.

4. The rotary motor according to claim 2, wherein, The cross-sectional area of ​​the common wiring component is smaller than the cross-sectional area of ​​the first wiring component, the second wiring component, the third wiring component, the fourth wiring component, the fifth wiring component, the sixth wiring component, the seventh wiring component, the eighth wiring component, and the ninth wiring component.

5. The rotary electric motor according to any one of claims 1 to 4, wherein, When current flows through the first wiring component group and the second wiring component group, the second wiring component group is positioned above the first wiring component group in the vertical direction.

6. The rotary electric motor according to claim 5, wherein, The spacing between adjacent wiring components in the second wiring component group is greater than the spacing between adjacent wiring components in the first wiring component group.

7. The rotary electric motor according to any one of claims 1 to 4, 6, wherein, The winding switching device consists of a first winding switching device and a second winding switching device. The first winding switching device connects the first connecting member to the seventh connecting member, the third connecting member to the eighth connecting member, and the fifth connecting member to the ninth connecting member. The second winding switching device connects the second connecting member, the fourth connecting member, and the sixth connecting member to the common connecting member, thereby connecting the first winding group and the second winding group in parallel. The first winding switching device sets the first connecting member and the seventh connecting member to be disconnected, sets the third connecting member and the eighth connecting member to be disconnected, and sets the fifth connecting member and the ninth connecting member to be disconnected. The second winding switching device connects the second connecting member and the seventh connecting member, connects the fourth connecting member and the eighth connecting member, connects the sixth connecting member and the ninth connecting member, and sets the second connecting member, the fourth connecting member, and the sixth connecting member to be disconnected from the common connecting member, thereby connecting the first winding group and the second winding group in series.

8. The rotary electric motor according to claim 5, wherein, The winding switching device consists of a first winding switching device and a second winding switching device. The first winding switching device connects the first connecting member to the seventh connecting member, the third connecting member to the eighth connecting member, and the fifth connecting member to the ninth connecting member. The second winding switching device connects the second connecting member, the fourth connecting member, and the sixth connecting member to the common connecting member, thereby connecting the first winding group and the second winding group in parallel. The first winding switching device sets the first connecting member and the seventh connecting member to be disconnected, sets the third connecting member and the eighth connecting member to be disconnected, and sets the fifth connecting member and the ninth connecting member to be disconnected. The second winding switching device connects the second connecting member and the seventh connecting member, connects the fourth connecting member and the eighth connecting member, connects the sixth connecting member and the ninth connecting member, and sets the second connecting member, the fourth connecting member, and the sixth connecting member to be disconnected from the common connecting member, thereby connecting the first winding group and the second winding group in series.

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