Vehicle drive device and control device

Abstract

To efficiently control coil eddy current loss.SOLUTION: A vehicle drive device includes a stator having a coil wire wound in multiple groups, a rotor that rotates when a current is passed through the coil wire, and multiple inverters, at least one for each group, that supply power to the coil wire of the corresponding group, and the coil wires of the multiple groups are arranged in each slot of the stator such that the coil wires of the same group have the same radial positional relationship with the coil wires of other groups.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a vehicle drive device and a control device. [Background technology]

[0002] A known technique has nine windings corresponding to nine phases, with three windings grouped together so that the total sum of the currents supplied to each winding is zero. A control unit selects two winding groups as stopped winding groups based on the motor rotation speed and torque command (load), and stops the supply of current to these stopped winding groups for a predetermined period. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-233392 Summary of the Invention [Problem to be solved by the invention]

[0004] In winter and other times, it is important to secure a heat source for battery temperature control. In other words, there are cases where a function to increase motor loss when necessary is required. In such cases, the above-mentioned conventional technology cannot efficiently control motor loss (especially coil eddy current loss).

[0005] Therefore, in one aspect, an object of the present disclosure is to enable efficient control of coil eddy current loss. [Means for solving the problem]

[0006] In one aspect, a rotor includes a stator having a coil wire wound in a plurality of groups; a rotor that is rotated by energizing the coil wire; a plurality of inverters, at least one for each of the groups, for supplying power to the coil wires of the corresponding group; A vehicle drive device is provided in which the coil wires of the multiple groups are arranged in each slot of the stator so that the coil wires of the same group have the same radial positional relationship with the coil wires of other groups. [Effects of the Invention]

[0007] In one aspect, the present disclosure makes it possible to efficiently control coil eddy current loss. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a schematic diagram of an example of an electric circuit including a rotating electric machine according to an embodiment of the present invention; [Figure 2] 1 is a schematic explanatory diagram of a method for controlling a rotating electric machine via an inverter by a control device; [Figure 3] FIG. 2 is a diagram schematically illustrating a parallel configuration of stator coils in a rotating electric machine. [Figure 4] 1 is a cross-sectional view of a rotating electric machine taken along a plane perpendicular to the axial direction. [Figure 5] FIG. 2 is an explanatory diagram of the winding arrangement in the slots of the stator core. [Figure 6] FIG. 10 is a cross-sectional view showing the radial arrangement positions of the coil wires of each group in one slot. [Figure 7] 4 is a graph showing the relationship between a current supply method for a stator coil and coil eddy current loss according to the present embodiment. [Figure 8] FIG. 1 is a diagram illustrating an example of a warming system that uses cooling water. [Figure 9] FIG. 2 is a schematic diagram illustrating an example of a hardware configuration of a control device. [Figure 10] 3 is a schematic flowchart showing an example of control executed by the control device of the present embodiment. [Figure 11] 10A and 10B are diagrams illustrating an example of the relationship between the rotation speed and torque of a rotating electric machine that can be achieved by each current supply method. [Figure 12]10 is a flowchart showing an example of a group selection energization process (step S706). [Figure 13] 4 is a graph showing the relationship between a current supply method for a stator coil and coil eddy current loss according to the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Each embodiment will be described in detail below with reference to the accompanying drawings. Note that the dimensional ratios in the drawings are merely examples and are not limiting. Furthermore, shapes and the like in the drawings may be partially exaggerated for the sake of explanation. Furthermore, in the drawings, for ease of viewing, reference symbols may be assigned only to some of the parts that exist with the same attribute.

[0010] FIG. 1 is a schematic diagram of an example of an electric circuit 200 including a rotating electric machine 1 of this embodiment. FIG. 1 also shows a control device 500. In FIG. 1, dotted arrows associated with the control device 500 indicate the exchange of information (signals and data). The rotating electric machine 1 and the control device 500, together with the electric circuit 200, form an example of a vehicle drive device.

[0011] The rotating electric machine 1 is driven through the control of the inverter INV by the control device 500. In the electric circuit 200 shown in FIG. 1, the rotating electric machine 1 is electrically connected to the power source Va via the inverter INV. The inverter INV includes, for example, power switching elements (e.g., MOSFETs: Metal-Oxide-Semiconductor Field Effect Transistors, IGBTs: Insulated Gate Bipolar Transistors, etc.) on the high-potential side and low-potential side of the power source Va for each phase, and the power switching elements on the high-potential side and the power switching elements on the low-potential side form upper and lower arms. The inverter INV may include multiple pairs of upper and lower arms for each phase. Each power switching element may be PWM (Pulse Width Modulation) driven under the control of the control device 500 so as to generate a desired rotational torque. The power source Va may be, for example, a battery with a relatively high rated voltage, such as a lithium-ion battery or a fuel cell.

[0012] In this embodiment, as in the electric circuit 200 shown in Fig. 1, a smoothing capacitor C is electrically connected in parallel with the inverter INV between the high potential side and the low potential side of the power supply Va. Note that multiple sets of smoothing capacitors C may be electrically connected in parallel with each other between the high potential side and the low potential side of the power supply Va. Also, a DC / DC converter may be provided between the power supply Va and the inverter INV.

[0013] FIG. 2 is a schematic explanatory diagram of a method for controlling the rotating electrical machine 1 via the inverter INV by the control device 500.

[0014] 2, the inverter INV includes four inverters INV1 to INV4. The inverters INV1 to INV4 are electrically connected in a one-to-one correspondence to the groups WG1 to WG4 of the stator coils 322, respectively. That is, the inverter INV1 is electrically connected to the group WG1 of the stator coils 322, the inverter INV2 is electrically connected to the group WG2 of the stator coils 322, the inverter INV3 is electrically connected to the group WG3 of the stator coils 322, and the inverter INV4 is electrically connected to the group WG4 of the stator coils 322.

[0015] According to this configuration, the control device 500 can individually control the groups WG1 to WG4 of the stator coils 322 by individually controlling the inverters INV1 to INV4. For example, the control device 500 can energize any one of the groups WG1 to WG4 of the stator coils 322, energize any combination of two groups, energize any combination of three groups, or energize all four groups.

[0016] Fig. 3 is a diagram schematically illustrating a parallel configuration of the stator coils 322 in the rotating electric machine 1. In Fig. 3, reference numeral 90 indicates a terminal of each phase (indicated by "U", "V", and "W" in the drawing). Each terminal 90 is electrically connected to an inverter of a corresponding group (one of the inverters INV1 to INV4).

[0017] The stator coil 322 is formed by winding a coil wire 3224 around the stator core 320 (see FIG. 4).

[0018] In this embodiment, the stator coils 322 are connected in parallel for each phase as shown in Fig. 3. In addition, in this embodiment, the stator coils 322 are divided into groups (WG1 to WG4 in this embodiment) according to the number of parallel coils, and each group is electrically connected individually to an inverter INV (one of the inverters INV1 to INV4).

[0019] When the stator coils 322 are connected in parallel for each phase, the current required to generate the same output can be reduced compared to when they are connected in series. For example, when four stator coils are connected in parallel as shown in Fig. 3, the same output as when a current of 400 A is passed in series can be achieved by passing a current of 100 A. In this embodiment, the number of parallel connections (number of groups) is four, but other numbers of parallel connections are also possible.

[0020] 4 to 6 are explanatory diagrams of the winding pattern of the stator coil 322 according to this embodiment. FIG. 4 is a cross-sectional view of the rotating electric machine 1 taken along a plane perpendicular to the axial direction. FIG. 4 also shows the rotor 34 disposed radially inside the stator 32. In FIG. 4, numbers assigned to some of the slots 3204 represent slot numbers, and arrows R4 indicate the numbering order of the slot numbers (counterclockwise). FIG. 5 is an explanatory diagram of the winding arrangement within the slots of the stator core 320. In FIG. 5, for convenience of explanation, 48 slots 3204 are arranged in a non-circular (C-shaped) configuration. In FIG. 5, the numbers in the cross section of the coil wire of the stator coil 322 represent the winding order, and the numbers on the radially outer side represent the slot number. Furthermore, the symbols on the radially outer side of the slot number indicate different current flow directions. FIG. 6 is a cross-sectional view showing the radial arrangement positions of the coil wires 3224 of each group within any one slot 3204.

[0021] In this embodiment, the coil wire 3224 is wound by wave winding in such a manner that stator coils 322 of the same phase are arranged in each slot 3204 of the stator core 320. The coil wire 3224 is also wound in such a manner that stator coils 322 of the same phase are arranged in two circumferentially adjacent slots 3204, and the U, V, and W phases periodically change between every two circumferentially adjacent slots 3204. In FIG. 4 , the phases "U," "V," and "W" of the coil wire 3224 are distinguished in parentheses following the reference numeral 3224.

[0022] In this embodiment, the coil wires 3224 are wound such that the stator coils 322 for each group are at the same radial position. That is, the coil wires 3224 for the four groups WG1 to WG4 are arranged in each slot 3204 such that the coil wires 3224 for the same group have the same radial positional relationship with the coil wires 3224 for the other groups. Specifically, in this embodiment, as shown in FIG. 6 , in each slot 3204, the coil wires 3224 for group WG1 for each phase are located at the radially outermost position, the coil wires 3224 for group WG2 are located at the second radially outermost position, the coil wires 3224 for group WG3 are located at the third radially outermost position, and the coil wires 3224 for group WG4 are located at the fourth radially outermost position (the radially innermost position).

[0023] Next, a preferred method for utilizing heat generated due to coil eddy current loss will be described with reference to FIG. 7 and subsequent figures.

[0024] Fig. 7 is a graph showing the relationship between the current supply method for the stator coil 322 and the coil eddy current loss according to this embodiment. Fig. 7 shows four current supply methods for the stator coil 322. The four current supply methods are: a method of supplying current to all of the coil wires 3224 of the four groups WG1 to WG4 (represented as "all groups supplying current"), a method of supplying current to only the coil wires 3224 of the groups WG1 to WG3 (represented as "only groups WG1, WG2, and WG3 supplying current"), a method of supplying current to only the coil wires 3224 of the groups WG1 and WG2 (represented as "only groups WG1 and WG2 supplying current"), and a method of supplying current to only the coil wires 3224 of the group WG1 (represented as "only group WG1 supplying current").

[0025] 7 compares coil eddy current loss under the condition that the total amount of current flowing through the multiple groups is constant, i.e., the total amount of current flowing through the entire stator coil 322 is the same for all four current-flowing methods.

[0026] As can be seen from Figure 7, the coil eddy current loss differs for each of the four current-carrying methods. Specifically, the fewer the number of groups to which current is passed, the greater the coil eddy current loss. This is because the magnitude of the current flowing per coil wire 3224 increases as the number of groups to which current is passed decreases.

[0027] In this embodiment, the difference in coil eddy current loss for each current application method is utilized to efficiently raise the temperature of the object to be heated. Here, the larger the coil eddy current loss, the greater the temperature rise of the object to be heated. By changing the current application method according to the target value of the temperature rise of the object to be heated (e.g., the target temperature rise amount), the object to be heated can be efficiently raised in temperature. For example, if the target value of the temperature rise of the object to be heated is relatively small, a current application method with relatively small coil eddy current loss is used, and if the target value of the temperature rise of the object to be heated is relatively large, a current application method with relatively large coil eddy current loss is used. Below, the characteristic configuration of this embodiment will be further described.

[0028] FIG. 8 is a diagram that schematically shows an example of a warming system 8 that uses cooling water.

[0029] 8, the stator coil 322 is cooled by the oil in the oil passage 61. That is, the stator coil 322 increases the temperature of the oil in the oil passage 61. The oil in the oil passage 61 may be circulated by the oil pump 51.

[0030] 8, oil passage portion 619, which is a part of oil passage 61, may have an annular shape that contacts the coil end (not shown) of stator coil 322. In this case, heat can be efficiently extracted from the coil end that generates a relatively large amount of heat.

[0031] Cooling water is supplied to the oil cooler 69 by a water pump 71 via a cooling water passage 70, and the oil is cooled (the cooling water is heated) by heat exchange between the cooling water in the cooling water passage 70 and the oil in the oil passage 61.

[0032] The warming system 8 provides the heat extracted from the stator coil 322 in this manner to the system 77 to be warmed via the cooling water in the cooling water passage 70. In a modified example, the warming system 8 may extract the heat from the stator coil 322 via oil and provide the heat from the oil to the system 77 to be warmed (or may provide the heat without using the cooling water).

[0033] The system 77 to be warmed up is any vehicle-mounted system that requires or is useful for warming up, such as an air conditioning system or a battery system. The battery system may include a high-voltage battery that functions as a power source for the rotating electrical machine 1.

[0034] However, in vehicles without an engine, it is not possible to configure a system that utilizes the exhaust heat of the engine, which increases the possibility that rapid warm-up cannot be achieved in low-temperature environments, for example. Therefore, the warm-up system 8 shown in Figure 8 is preferably implemented in vehicles without an engine.

[0035] 9 is a schematic diagram showing an example of the hardware configuration of the control device 500. In FIG. 9, other in-vehicle electronic devices 130 are schematically shown in association with the hardware configuration of the control device 500.

[0036] The other on-vehicle electronic devices 130 include the rotating electric machine 1, an electric oil pump 51, a water pump 71, a host ECU (Electronic Control Unit) 74, and the like.

[0037] The control device 500 includes a CPU (Central Processing Unit) 111, a RAM (Random Access Memory) 112, a ROM (Read Only Memory) 113, an auxiliary storage device 114, a drive device 115, and a communication interface 117, all connected by a bus 119, as well as a wired transceiver unit 125 and a wireless transceiver unit 126 connected to the communication interface 117.

[0038] The auxiliary storage device 114 is, for example, a hard disk drive (HDD) or a solid state drive (SSD), and is a storage device that stores data related to application software and the like.

[0039] The wired transceiver 125 includes a transceiver capable of communicating using a wired network 128 based on a protocol such as CAN (Controller Area Network) or LIN (Local Interconnect Network). Other in-vehicle electronic devices 130 are connected to the wired transceiver 125. However, some or all of the other in-vehicle electronic devices 130 may be connected to the bus 119 or may be connected to the wireless transceiver 126.

[0040] Wireless transceiver 126 is a transceiver capable of communicating using a wireless network. The wireless network may include a wireless communication network for mobile phones, the Internet, a Virtual Private Network (VPN), a Wide Area Network (WAN), etc. Wireless transceiver 126 may also include a Near Field Communication (NFC) unit, a Bluetooth (registered trademark) communication unit, a Wireless Fidelity (Wi-Fi) transceiver, an infrared transceiver, etc.

[0041] The control device 500 may be connectable to a recording medium 116. The recording medium 116 stores a predetermined program. The program stored in the recording medium 116 is installed in the auxiliary storage device 114 of the control device 500 via the drive device 115. The installed predetermined program can be executed by the CPU 111 of the control device 500. For example, the recording medium 116 may be a recording medium that records information optically, electrically, or magnetically, such as a CD (Compact Disc)-ROM, a flexible disk, or a magneto-optical disk, or a semiconductor memory that records information electrically, such as a ROM or a flash memory.

[0042] Fig. 10 is a schematic flowchart showing an example of control executed by the control device 500 of this embodiment. Fig. 11 is a diagram showing an example of the relationship between the rotation speed and torque of the rotating electrical machine 1 that can be achieved by each current supply method.

[0043] In step S700, the control device 500 acquires values of various temperature parameters that directly or indirectly represent the state of the system 77 to be warmed up. The various temperature parameters may be the outside air temperature, the inside air temperature, the oil temperature, the water temperature (the water temperature in the cooling water passage 70), the temperature inside the system 77, etc. Some or all of the values of the various temperature parameters may be acquired via the host ECU 74.

[0044] In step S701, the control device 500 determines whether the system 77 to be heated is in a low-temperature state where warming is necessary or useful, based on the values of the various temperature parameters obtained in step S700. That is, the control device 500 determines whether the values of the various temperature parameters obtained in step S700 indicate a low-temperature state of the system 77 to be heated. For example, the control device 500 may determine that the values of the various temperature parameters indicate a low-temperature state of the system 77 to be heated when some or all of the values of the various temperature parameters are less than the corresponding threshold values. If the determination result is "YES," the process proceeds to step S702; otherwise, the process proceeds to step S708.

[0045] In step S702, the control device 500 acquires the control target values (for example, target acceleration, target torque, etc.) of the rotary electric machine 1 from the host ECU 74.

[0046] In step S704, the control device 500 determines whether the control target value acquired in step S702 can be achieved with three or fewer groups (three or fewer of groups WG1 to WG4). This determination may be made using a characteristic map such as that shown in FIG. 11. In FIG. 11, characteristic L111 represents the maximum characteristic that can be achieved by energizing only the coil wire 3224 of group WG1, and region R111 represents the characteristic region that can be achieved by energizing only the coil wire 3224 of group WG1. Characteristic L112 and region R112 represent the same characteristic and region for a method in which only the coil wire 3224 of groups WG1 and WG2 are energized. Characteristic L113 and region R113 represent the same characteristic and region for a method in which only the coil wire 3224 of groups WG1 to WG3 are energized. Characteristic L114 and region R114 represent the same characteristic and region for a method in which all four coil wires 3224 of groups WG1 to WG4 are energized. Region R114 is a region that can only be realized by energizing all of the coil wires 3224 in the four groups WG1 to WG4. On the other hand, region R111 is a region that can be realized by any of the four energization methods. Region R112 is a region that cannot be realized by energizing only the coil wires 3224 in group WG1. Region R113 is a region that cannot be realized by only energizing the coil wires 3224 in group WG1 or only energizing the coil wires 3224 in groups WG1 and WG2.

[0047] In step S704, if the determination result is "YES", the process proceeds to step S706, otherwise the process proceeds to step S708.

[0048] In step S706, the control device 500 energizes the stator coils 322 of three or less groups so as to achieve the control target value of the rotating electric machine 1. A specific example of the processing of step S706 (hereinafter also referred to as "group selection energization processing") will be described later with reference to FIG.

[0049] In step S708, the control device 500 energizes the four groups of stator coils 322 so as to realize the control target value of the rotating electric machine 1. However, even in this case, there may be cases where three or fewer groups of stator coils 322 are energized for purposes other than warm-up (for example, to improve the output efficiency of the rotating electric machine 1).

[0050] FIG. 12 is a flowchart showing an example of the group selection energization process (step S706).

[0051] In step S1200, the control device 500 determines the degree of necessity (urgency) of warming up the system 77 to be warmed up, based on the values of the various temperature parameters obtained in step S700. In this embodiment, the degree of necessity of warming up the system 77 to be warmed up is determined in three stages. The degree of necessity of warming up the system 77 to be warmed up is determined to be higher the lower the temperature of the system 77. For example, if the temperature of the system 77 is equal to or lower than a first threshold, it may be determined to be "high," if the temperature of the system 77 is equal to or lower than a second threshold that is higher than the first threshold, it may be determined to be "medium," and in all other cases it may be determined to be "low."

[0052] In step S1202, the control device 500 determines whether the degree of necessity determined in step S1200 is “high.” If the determination result is “YES,” the process proceeds to step S1204; otherwise, the process proceeds to step S1212.

[0053] In step S1204, control device 500 determines whether the control target value acquired in step S702 can be achieved by only one group (only group WG1). If the determination result is "YES", the process proceeds to step S1206, and otherwise the process proceeds to step S1208.

[0054] In step S1206, control device 500 energizes stator coils 322 of only one group (only group WG1) so that the control target value of rotating electric machine 1 is realized.

[0055] In step S1208, control device 500 determines whether the control target value acquired in step S702 can be achieved by only two groups (only groups WG1 and WG2). If the determination result is "YES", the process proceeds to step S1210; otherwise, the process proceeds to step S1214.

[0056] In step S1210, the control device 500 energizes the stator coils 322 of only two groups (only groups WG1 and WG2) so that the control target value of the rotary electric machine 1 is realized.

[0057] In step S1212, the control device 500 determines whether the degree of necessity determined in step S1200 is “medium.” If the determination result is “YES,” the process proceeds to step S1208; otherwise, the process proceeds to step S1214.

[0058] In step S1214, the control device 500 energizes the stator coils 322 of only three groups (only groups WG1 to WG3) so that the control target value of the rotary electric machine 1 is realized.

[0059] 12, the power supply method is changed depending on the degree of need for warm air for the system 77 to be heated, thereby making it possible to efficiently raise the temperature of the system 77 to be heated. For example, it is possible to reduce the possibility of supplying excessive heat to the system 77 to be heated, or of supplying insufficient heat to the system 77 to be heated. 11 and 12, energizing the stator coils 322 in only one group refers to energizing only the group WG1, but alternatively or additionally, other groups such as energizing only the group WG2 may be used. Similarly, energizing the stator coils 322 in only two groups refers to energizing only the groups WG1 and WG2, but alternatively or additionally, other two groups such as energizing only the groups WG2 and WG3 may be used. Similarly, energizing the stator coils 322 in only three groups refers to energizing only the groups WG1, WG2, and WG3, but alternatively or additionally, other three groups such as energizing only the groups WG2, WG3, and WG4 may be used.

[0060] A further preferred embodiment will now be described with reference to FIG.

[0061] Fig. 13 is a graph showing the relationship between the current supply method for the stator coil 322 and the coil eddy current loss according to this embodiment. Four current supply methods are shown in Fig. 13 as the current supply method for the stator coil 322. The four current supply methods are a method of supplying current only to the coil wire 3224 of group WG4 (represented as "current supply to group WG4 only"), a method of supplying current only to the coil wire 3224 of group WG3 (represented as "current supply to group WG3 only"), a method of supplying current only to the coil wire 3224 of group WG2 (represented as "current supply to group WG2 only"), and a method of supplying current only to the coil wire 3224 of group WG1 (represented as "current supply to group WG1 only").

[0062] 13 compares the coil eddy current loss under the condition that the amount of current flowing through each group is the same. That is, the total current flowing through the entire stator coil 322 is the same for all four current-flowing methods.

[0063] As can be seen from Fig. 13, the coil eddy current loss differs for each of the four current-carrying methods. Specifically, the further radially outward the coil wire 3224 of the current-carrying group is located, the greater the coil eddy current loss. Coil eddy current loss is loss caused by eddy currents generated by magnetic flux passing through the inside of the coil wire 3224. Magnetic flux is more likely to pass through the inside of the coil wire 3224 of the group that is located radially inside the coil wire 3224 of the current-carrying group. Therefore, the coil eddy current loss increases with the coil wire 3224 located radially outward.

[0064] In this way, even when current is applied to the stator coils 322 of the same group, it is possible to efficiently raise the temperature of the object to be heated by utilizing the fact that the coil eddy current loss differs for each group (according to the radial position of the coil wire 3224 of each group). For example, if the target value of the temperature rise of the object to be heated is relatively small, a current application method with relatively small coil eddy current loss (coil wire 3224 of the radially inner group W4) is used, and if the target value of the temperature rise of the object to be heated is relatively large, a current application method with relatively large coil eddy current loss (coil wire 3224 of the radially outer group W1) is used.

[0065] 13 can also be used in combination with the energization methods described above with reference to FIG. 7. In this case, one energization method can be selected from a maximum of seven energization methods. This allows for more precise control of the energization of the stator coil 322 according to the degree of warm-up required for the system 77 to be warmed up.

[0066] Although each embodiment has been described in detail above, it is not limited to the specific embodiment, and various modifications and changes are possible within the scope of the claims. It is also possible to combine all or a plurality of components of the above-described embodiments. [Explanation of symbols]

[0067] 1 Rotating electric machine (vehicle drive device), 32 Stator, 3204 Slot, 3224 Coil wire, 34 Rotor, INV1 to INV4 Inverter, 77 Warm-up target system (heat-up target), 200 Electric circuit (vehicle drive device), 500 Control device (vehicle drive device), 111 CPU (inverter control unit), 117 Communication interface (acquisition unit)

Claims

1. a stator having coil wire wound in a plurality of groups; a rotor that is rotated by energizing the coil wire; a plurality of inverters, at least one for each of the groups, for supplying power to the coil wires of the corresponding group; The coil wires of the plurality of groups are arranged in each slot of the stator so that the coil wires of the same group have the same radial positional relationship with the coil wires of other groups.

2. an object to be heated is thermally connected to the coil wire; a control device for controlling the plurality of inverters; The vehicle drive system according to claim 1 , wherein the control device controls the plurality of inverters based on a temperature state of the object to be heated.

3. 3. The vehicle drive device according to claim 2, wherein the control device reduces the number of groups to which current is applied as the temperature state of the object to be heated decreases, under the condition that the total amount of current applied to the plurality of groups is constant.

4. the stator has an annular yoke radially outward of the slot, 3. The vehicle drive device according to claim 2, wherein the control device is configured to energize a group of the plurality of groups whose coil wire is located radially outward relative to other groups as the temperature state of the object to be heated decreases, under the condition that the number of groups among the plurality of groups to which current is applied is constant.

5. A control device for controlling a rotating electric machine having a stator and a rotor wound with coil wires divided into a plurality of groups, an inverter control unit that controls a plurality of inverters, at least one of which is provided for each of the groups; The inverter control unit controls the plurality of inverters in accordance with a temperature state of an object to be heated that is thermally connected to the coil wire.

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