Drive device

Abstract

The invention provides a driving device. The drive device is provided with: an electricity storage device; a motor having a three-phase coil; a first inverter which is connected to a power line to which an electrical storage device is connected, is connected to one end side of the three-phase coil, and has a plurality of first switching elements; a second inverter which is connected to the power line, is connected to the other end side of the three-phase coil, and has a plurality of second switching elements; a cooling device that uses a cooling medium to cool the electrical storage device, the motor, and the first and second inverters; and a control device that controls the first and second inverters on the basis of a torque command of the motor, in which the control device controls the first and second inverters.

Description

Technical Field

[0001] This disclosure relates to drive devices. Background Technology

[0002] Conventionally, such drive devices have been proposed that include a motor, an inverter, and a hydraulic mechanism (see, for example, Japanese Patent Application Laid-Open No. 2009-44805). The motor has two rotors. The hydraulic mechanism supplies working oil to a phase-changing mechanism installed on the motor rotors. In this device, when the temperature of the working oil is lower than a predetermined temperature, the stator coils of the motor are energized to heat the working oil. This improves the responsiveness of phase changes at low temperatures. Summary of the Invention

[0003] However, a drive unit has also been proposed, which includes: an energy storage device; a motor having three-phase coils; and first and second inverters connected to the power line to which the energy storage device is connected and connected to one end and the other end of the three-phase coils, and having multiple first and second switching elements. Thus, in a drive unit where the first and second inverters and the motor are connected via H-connections, further increasing the heat generation based on the motor and the first and second inverters is recognized as an important issue in order to heat the energy storage device.

[0004] The main purpose of the drive device disclosed herein is to further increase the heat of the wound.

[0005] The drive device disclosed herein employs the following means to achieve the aforementioned main objectives.

[0006] The drive device disclosed herein includes:

[0007] Energy storage devices;

[0008] The motor has three-phase coils;

[0009] The first inverter is connected to the power line to which the energy storage device is connected and to one end of the three-phase coil and has a plurality of first switching elements;

[0010] The second inverter is connected to the power line and to the other end of the three-phase coil and has a plurality of second switching elements;

[0011] A cooling device is used to cool the energy storage device, the motor, and the first and second inverters using a cooling medium; and

[0012] The control device controls the first and second inverters according to the torque command of the motor.

[0013] The control device controls the first and second inverters such that the direction of the phase current of two phases in the three-phase coils of the motor is from one inverter of the first and second inverters toward the other, and the direction of the phase current of one phase in the three-phase coils of the motor other than the two phases is opposite to the direction of the phase current of the two phases.

[0014] In the drive device disclosed herein, the first and second inverters are controlled such that the direction of the phase current of two phases in the three-phase coils of the motor is from one inverter of the first and second inverters toward the other inverter. Furthermore, in the drive device disclosed herein, the first and second inverters are controlled such that the direction of the phase current of one phase (excluding the two phases) in the three-phase coils of the motor is opposite to the direction of the phase current of the two phases. Through this control, a circulating current is generated from two phases in the three-phase coils of the motor, through one inverter of the first and second inverters, the power line, the other phase in the three-phase coils of the motor, and the other inverter of the first and second inverters, circulating back to the two phases in the three-phase coils of the motor. This allows more current to flow through the motor and the first and second inverters. As a result, the heat generation of the motor and the first and second inverters can be further increased.

[0015] In this disclosed drive device, a load device can also be included, which is mounted on at least one of the positive and negative poles of the power line. Since the current flowing through the load device generates heat, the heat generation can be further increased. Furthermore, by making the direction of the phase current of one phase (excluding two phases) in the motor's three-phase coils opposite to the direction of the phase currents of the other two phases, the current flowing through the power line is reduced compared to making all phase currents in the motor's three-phase coils in the same direction. Therefore, in a structure with a load device mounted on at least one of the positive and negative poles of the power line, the load device can be protected compared to making all phase currents in the motor's three-phase coils in the same direction. Thus, the heat generation can be further increased, and protection of the load device can be achieved.

[0016] Furthermore, in the drive device disclosed herein, the control device can also perform feedback control on the first and second inverters in such a way that the phase current of the motor becomes the current required for the heat generated based on the heating requirement of the energy storage device. This allows for more appropriate use of the motor and the first and second inverters to generate heat.

[0017] Furthermore, in the drive device disclosed herein, the control device can also set d-axis and q-axis current commands in such a way that the required heat from the energy storage device flows through the d-axis current in the motor, and the zero-phase current, which is the sum of the currents of each phase of the motor, becomes the current based on the required heat. The voltage commands for each phase are then set based on the d-axis and q-axis current commands, and the voltage commands for each phase are used to control the first and second inverters. This allows for more appropriate use of the motor and the first and second inverters to generate heat. Attached Figure Description

[0018] The features, advantages, and technical and industrial significance of exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, in which the same reference numerals denote the same elements, and wherein:

[0019] Figure 1 This is a schematic structural diagram of a battery-electric vehicle equipped with a drive device according to an embodiment of the present disclosure.

[0020] Figure 2 This is a block diagram illustrating an example of the functional blocks of the first and second inverters controlled by the ECU at low temperatures.

[0021] Figure 3 This is an illustrative diagram illustrating an example of current flow in a battery-electric vehicle according to an embodiment.

[0022] Figure 4 This is an explanatory diagram illustrating the relationship between the phase currents of each embodiment and the zero-phase current, which is the sum of the phase currents.

[0023] Figure 5 This is an explanatory diagram used to illustrate the relationship between the phase currents of the comparative example and the zero-phase current, which is the sum of the phase currents.

[0024] Figure 6 This is a block diagram illustrating an example of the functional blocks of the first and second inverters controlled by the ECU at low temperatures in other embodiments. Detailed Implementation

[0025] Referring to the accompanying drawings, a method (implementation method) for carrying out this disclosure is described. Figure 1 This is a schematic structural diagram of a battery electric vehicle 10 equipped with a drive device according to an embodiment of the present disclosure. As shown in the figure, the battery electric vehicle 10 of the embodiment includes a motor 20, first and second inverters 22 and 24, a battery 26 as an energy storage device, a switching device 32 as a load device, a cooling device 40, and an electronic control unit (hereinafter referred to as "ECU") 50 as a control device.

[0026] Motor 20 is configured, for example, as a three-phase AC motor having a rotor with permanent magnets embedded in its rotor core and a stator with three-phase (U-phase, V-phase, W-phase) coils wound on its stator core. The rotor is connected to a drive shaft via a differential gear to a drive wheel.

[0027] The first and second inverters 22 and 24 are respectively connected to the power lines 28 (positive line 28p and negative line 28n) to which the battery 26 is connected, and to one end and the other end of the three-phase coil of the motor 20. The first inverter 22 includes six transistors (first switching elements) T11 to T16 as switching elements and six diodes D11 to D16 connected in parallel with the six transistors T11 to T16. The transistors T11 to T16 are arranged in pairs of two, with the positive line 28p and the negative line 28n as the source side and the drain side, respectively. The connection points of the pairs of transistors T11 to T16 are respectively connected to one end of the three-phase coil of the motor 20. The second inverter 24, like the first inverter 22, includes six transistors (second switching elements) T21 to T26 as switching elements and six diodes D21 to D26. Transistors T21 to T26 are arranged in pairs, with two transistors each serving as the source side and drain side relative to the positive line 28p and negative line 28n. The connection points of each pair of transistors T21 to T26 are respectively connected to the other end of the three-phase coil of the motor 20. The battery 26, for example, is configured as a lithium-ion secondary battery or a nickel-metal hydride secondary battery, and is connected to the power lines 28 (positive line 28p and negative line 28n). A smoothing capacitor 30 is connected to the power lines 28. In this embodiment, the power lines 28 are connected in the following order: battery 26, capacitor 30, first inverter 22, and second inverter 24.

[0028] The switching device 32 is mounted on the positive terminal 28p of the power line 28. The switching device 32 includes two transistors T31 and T32 and two diodes D31 and D32. Transistors T31 and T32 are mounted in series on the positive terminal 28p. Diode D31 is connected in parallel with transistor T31 in a manner that makes the direction from the first inverter 22 toward the second inverter 24 positive. Diode D32 is connected in parallel with transistor T32 in a manner that makes the direction from the second inverter 24 toward the first inverter 22 positive.

[0029] The cooling device 40 includes a circulation path 42, a radiator 44, and an electric pump 46. The circulation path 42 is configured to circulate a cooling medium, such as cooling water, sequentially through the battery 26, the first inverter 22, the motor 20, the second inverter 24, and the radiator 44. The electric pump 46 circulates the cooling medium in the circulation path 42. Alternatively, the circulation path 42 may be configured to circulate the cooling medium sequentially through the second inverter 24, the motor 20, the first inverter 22, the battery 26, and the radiator 44.

[0030] The ECU 50 is equipped with a microcomputer containing a CPU, ROM, RAM, flash memory, input / output ports, and communication ports, as well as various drive circuits and logic ICs. Signals from various sensors are input to the ECU 50. Examples of input signals include, for instance, the rotational position θm from the rotational position sensor 20a (detecting the rotational position of the rotor of motor 20), and the phase currents Iu, Iv, and Iw from the current sensors 22u, 22v, and 22w (detecting the phase currents of each phase of motor 20). Other input signals include, for instance, the voltage Vb of the battery 26 from the voltage sensor 26v, the current Ib of the battery 26 from the current sensor 26i, and the temperature Tb of the battery 26 from the temperature sensor 26t. Additionally, examples of input signals include, for instance, the voltage VH of the capacitor 30 (power line 28) from the voltage sensor 30v, the on / off signal from the power switch 60, and the operating position (gear shift SP) of the gear shift lever 61 from the gear shift sensor 62. Additionally, input signals include, for example, the amount of accelerator pedal 63 depressed (acceleration opening Acc) from accelerator pedal position sensor 64, the amount of brake pedal depressed (brake pedal position BP) from brake pedal position sensor 66, and the vehicle speed V from vehicle speed sensor 67. Switching control signals are output from ECU 50 to transistors T11 to T16 and T21 to T26 of the first and second inverters 22 and 24, and to transistors T31 and T32 of the switching device 32. ECU 50 calculates the electrical angle θe and rotational speed Nm of motor 20 based on the rotor rotational position θm of motor 20, or calculates the state of charge (SOC) of battery 26 based on the accumulated current Ib of battery 26.

[0031] In the battery electric vehicle 10 of the embodiment, the ECU 50 sets the required torque Td* for driving based on the accelerator pedal opening Acc and the vehicle speed V. Furthermore, it sets the torque command Tm* of the motor 20 to drive according to the set required torque Td*, and controls the switching of transistors T11 to T16 and T21 to T26 of the first and second inverters 22 and 24 according to the set torque command Tm*.

[0032] Next, the operation of the battery electric vehicle 10 will be explained, especially the control of the first and second inverters 22 and 24 at low temperatures. Figure 2 This is a block diagram illustrating an example of the functional blocks of the first and second inverters 22 and 24 controlled by ECU 50 at low temperatures. In ECU 50, as... Figure 2 The functional block includes a current command setting unit 500, a feedback (FB) correction setting unit 510, and a PWM signal generation unit 520. Here, "low temperature" can refer to situations where the external temperature is below a predetermined temperature (e.g., 1°C, 3°C, 5°C, etc.) or when the battery 26 is at a low temperature where it cannot function. Furthermore, when transistors T31 and T32, which are configured as switching devices 32, are turned on, the battery-electric vehicle 10 stops.

[0033] The current command setting unit 500 sets the current commands Iu*, Iv*, and Iw* of the motor 20 based on the required heat Qreq of the battery 26, and outputs the set current commands Iu*, Iv*, and Iw*. The ECU 50 pre-determines the relationship between the difference between the current temperature Tb of the battery 26 (from the temperature sensor 26t) and the lower limit of the temperature range in which the battery 26 can perform, and the required heat Qreq, through experiments, analysis, and machine learning, and stores this relationship in the ROM. Based on this relationship and the difference between the temperature Tb of the battery 26 (from the temperature sensor 26t) and the lower limit of the temperature range in which the battery 26 can perform, the required heat Qreq is set. In the current command setting unit 500, the current values ​​of current commands Iu*, Iv*, and Iw* are set to be the same. Regarding current commands Iv* and Iw*, the direction of the current is set to be from the second inverter 24 towards the first inverter 22. Regarding current command Iu*, the direction of the current is set to be from the first inverter 22 towards the second inverter 24. The current values ​​of current commands Iu*, Iv*, and Iw* are set to be larger when the required heat Qreq is large, compared to when the required heat Qreq is small, within the range not exceeding the maximum allowable current Immax of the motor 20 and the maximum allowable current Invmax of the first and second inverters 22 and 24.

[0034] The FB correction setting unit 510 inputs the differences between the current commands Iu*, Iv*, Iw* and the phase currents Iu, Iv, Iw of each phase of the motor 20 from the current sensors 22u, 22v, 22w. Furthermore, the FB correction setting unit 510 sets feedback correction terms Dfbu, Dfbv, Dfbw for the duty cycle command D* used to offset the differences between the current commands Iu*, Iv*, Iw* and the phase currents Iu, Iv, Iw, and outputs the set feedback correction terms Dfbu, Dfbv, Dfbw. Here, the duty cycle command D* is the proportion of the on-time of each transistor in one cycle (the sum of the on-time and off-time of each transistor).

[0035] The PWM signal generation unit 520 receives the duty cycle commands Du1*, Dv1*, and Dw1* of the first inverter 22, which are obtained by adding feedback correction terms Dfbu, Dfbv, and Dfbw to the base value Db of the predetermined duty cycle command, and the duty cycle commands Du2*, Dv2*, and Dw2* of the second inverter 24, which are obtained by adding the feedback correction terms Dfbu, Dfbv, and Dfbw to the base value Db (e.g., 50%) by a value multiplied by -1. Furthermore, the PWM signal generation unit 520 generates PWM signals for switching transistors T11 to T16 and T21 to T26 of the first and second inverters 22 and 24 by comparing the duty cycle commands Du1*, Dv1*, Dw1*, Du2*, Dv2*, and Dw2* with a triangular wave (carrier wave). Furthermore, the PWM signal generation unit 520 outputs the generated PWM signal to the first and second inverters 22 and 24, and performs switching control on transistors T11 to T16 and T21 to T26 of the first and second inverters 22 and 24. Through such control, feedback control is performed on the first and second inverters 22 and 24 in a manner that makes the current values ​​of phase currents Iu, Iv, and Iw the same, and makes the direction of phase current Iu different from that of phase currents Iv and Iw.

[0036] Figure 3 This is an explanatory diagram illustrating an example of the flow of current in the battery-electric vehicle 10 of the embodiment. Figure 4 This is an explanatory diagram illustrating the relationship between the phase currents Iu, Iv, and Iw in the implementation method and the zero phase current I0 (=Iu+Iv+Iw), which is the sum of the phase currents Iu, Iv, and Iw. Figure 5 This is an explanatory diagram illustrating the relationship between the phase currents Iu, Iv, and Iw in the comparative example and the zero-phase current I0 (=Iu+Iv+Iw), which is the sum of the phase currents Iu, Iv, and Iw. In the comparative example, the directions and values ​​of the phase currents Iu, Iv, and Iw are the same. Figure 3 , Figure 4 , Figure 5 In the diagram, the thick arrow indicates the direction of the current.

[0037] In the battery electric vehicle 10 of this embodiment, the phase currents Iu, Iv, and Iw of each phase of the motor 20 are all the same value. Furthermore, in the battery electric vehicle 10 of this embodiment, the first and second inverters 22 and 24 are controlled such that the phase currents Iv and Iw flow from the second inverter 24 towards the first inverter 22, and the phase current Iu flows from the first inverter 22 towards the second inverter 24. Through this control, the current... Figure 3 As shown, the power supply circulates from the V and W phases of motor 20 through the first inverter 22, the positive line 28p and negative line 28n of power line 28, the U phase, and the second inverter 24 back to the V and W phases. Therefore, as... Figure 4 As shown, with phase currents Iu, Iv, and Iw each at 200A, the zero-phase current I0 becomes 200A. Regarding phase currents Iu, Iv, and Iw, as long as they do not exceed the maximum allowable current Immax of motor 20 and the maximum allowable current Invmax of the first and second inverters 22 and 24, the required heat Qreq can be increased. Therefore, the heat generated by motor 20, the first and second inverters 22 and 24, and the switching device 32 can be further increased. This promotes the heating of the cooling medium in the cooling device 40, thereby promoting the heating of the battery 26. As a result, the degradation of the battery 26 at low temperatures can be more appropriately suppressed.

[0038] However, in the comparative example, the first and second inverters 22 and 24 are controlled such that the phase currents Iu, Iv, and Iw of each phase of the motor 20 flow in the direction from the first inverter 22 toward the second inverter 24 and become the same current value. Through this control, current flows from each phase of the motor 20, via the second inverter 24, to the positive line 28p and negative line 28n of the power line 28, and circulates to each phase via the first inverter 22. Therefore, as... Figure 5 As shown, when the phase currents Iu, Iv, and Iw are all 200A, the zero-phase current I0 becomes 600A. In this embodiment, by making one of the phase currents Iu, Iv, and Iw of each phase of the motor 20 face the opposite direction to the other phases, the zero-phase current I0 can be reduced, and the heating of the switching device 32 can be suppressed. Thus, the switching device 32 can be protected.

[0039] In the battery electric vehicle 10 equipped with the drive device described above, the first and second inverters 22 and 24 are controlled such that the phase currents Iv and Iw of the V-phase and W-phase in the three-phase coils of the motor 20 are directed from the second inverter 24 toward the first inverter 22, and the phase current Iu of the U-phase is directed in the opposite direction to the V-phase and W-phase. This further increases the heat generation capacity.

[0040] In addition, the positive line 28p of the power line 28 is equipped with a switching device 32, which can further increase the heat generation and protect the switching device 32.

[0041] Furthermore, by making the phase current of motor 20 a current based on the required heat Qreq, feedback control is performed on the first and second inverters 22 and 24, so that the motor and the first and second inverters 22 and 24 can be used more appropriately to generate heat.

[0042] In the above embodiment, the first and second inverters 22 and 24 are feedback controlled such that the phase currents Iu, Iv, and Iw of each phase of the motor 20 are currents based on the required heat Qreq. However, in other embodiments as described below, the d-axis and q-axis current commands Id* and Iq* are set such that the d-axis current flows through the motor 20 according to the required heat Qreq and the zero-phase current I0 is a current based on the required heat Qreq. Furthermore, the voltage commands Vu*, Vv*, and Vw of each phase can be set according to the current commands Id* and Iq*, and the first and second inverters 22 and 24 can be controlled using the voltage commands Vu*, Vv*, and Vw of each phase. Figure 6 This is a block diagram illustrating an example of the functional blocks of the first and second inverters 22 and 24 controlled by ECU 50 at low temperatures in other embodiments. In ECU 50, as... Figure 6 The functional block includes a dq current command setting unit 600, a zero-phase current command setting unit 610, a transformation calculation unit 620, a dq voltage command setting unit 630, a coordinate transformation unit 640, and a PWM signal generation unit 650. Here, "low temperature" can be exemplified by conditions such as an external air temperature below a predetermined temperature (e.g., 1°C, 3°C, 5°C, etc.) or a low temperature condition where the battery 26 cannot function. Furthermore, when transistors T31 and T32, which are configured as switching devices 32, are turned on, the battery-electric vehicle 10 stops.

[0043] The dq current command setting unit 600 sets the d-axis and q-axis current commands Id* and Iq* in a manner that the heat Qreq required to flow through the d-axis current in the motor 20 as described above, and outputs the set current commands Id* and Iq* to the dq voltage command setting unit 630.

[0044] The zero-phase current command setting unit 610 sets the current command I0* for the zero-phase current I0 based on the required heat Qreq, and outputs the set current command I0* to the dq voltage command setting unit 630. The zero-phase current command setting unit 610 sets the current command I0* to be larger when the required heat Qreq is large compared to when the required heat Qreq is small.

[0045] The transformation calculation unit 620 uses the electrical angle θe of the motor 20 to transform the coordinates of the phase currents Iu, Iv, and Iw of each phase of the motor 20 into the currents Id and Iq of the d-axis and q-axis (3-phase to 2-phase transformation). At the same time, the transformation calculation unit 620 calculates the zero-phase current I0 (=Iu+Iv+Iw) which is the sum of the phase currents Iu, Iv, and Iw, and outputs the currents Id, Iq, and the zero-phase current I0 to the dq voltage command setting unit 630.

[0046] The dq voltage command setting unit 630 calculates the d-axis and q-axis voltage commands Vd* and Vq* through current feedback control, in a manner that cancels the difference between the d-axis and q-axis current commands Id* and Iq* and the difference between the current command I0* and the zero-phase current I0. Furthermore, the dq voltage command setting unit 630 outputs the calculated voltage commands Vd* and Vq* to the coordinate transformation unit 640.

[0047] The coordinate transformation unit 640 uses the electrical angle θe of the motor 20 to transform the coordinates of the voltage commands Vd* and Vq* of the d-axis and q-axis into voltage commands Vu*, Vv*, and Vw* for each phase (2-phase to 3-phase transformation). Furthermore, the coordinate transformation unit 640 outputs the obtained voltage commands Vu*, Vv*, and Vw* for each phase to the PWM signal generation unit 650.

[0048] The PWM signal generation unit 650 compares the voltage commands Vu*, Vv*, Vw** of each phase with the carrier voltage (triangular wave voltage) to generate PWM signals for transistors T11 to T16 and T21 to T26 of the first and second inverters 22 and 24, and performs switching control of transistors T11 to T16 and T21 to T26.

[0049] Through such control, the current of motor 20 can be made to match... Figure 3 The example current is the same, which can further increase the heat generation. Therefore, the degradation of the battery 26 at low temperatures can be more effectively suppressed.

[0050] In the above embodiment, the first and second inverters 22 and 24 are fed back controlled by making the phase currents Iu, Iv, and Iw of the motor 20 the currents required by the heat demand Qreq based on the heating requirement of the battery 26. However, the duty cycle commands Du1*, Dv1*, Dw1*, Du2*, Dv2*, and Dw2* of the first and second inverters 22 and 24 can also be set according to the required heat demand Qreq. By comparing the set duty cycle commands Du1*, Dv1*, Dw1*, Du2*, Dv2*, and Dw2* with the triangular wave (carrier), PWM signals are generated to switch the transistors T11 to T16 and T21 to T26 of the first and second inverters 22 and 24. The generated PWM signals are then used to perform feedforward control on the first and second inverters 22 and 24.

[0051] In the above embodiment, the current commands Iv* and Iw* in the current commands Iu*, Iv*, and Iw* are set such that the direction of the current is from the second inverter 24 toward the first inverter 22. Furthermore, the current command Iu* in the current commands Iu*, Iv*, and Iw* is set such that the direction of the current is from the first inverter 22 toward the second inverter 24. However, the current commands Iu*, Iv*, and Iw* can be set such that the current direction of two of the current commands Iu*, Iv*, and Iw is opposite to the current direction of the other current command Iu*, Iv*, and Iw. For example, the current commands Iu* and Iw* in the current commands Iu*, Iv*, and Iw* can also be set such that the direction of the current is from the second inverter 24 toward the first inverter 22. Additionally, the current command Iv* can also be set so that the direction of the current is from the first inverter 22 toward the second inverter 24.

[0052] In the above embodiment, the positive line 28p of the power line 28 is provided with a switching device 32. However, the switching device 32 may also be provided on the negative line 28n of the power line 28, or the switching device 32 may be provided on both the positive line 28p and the negative line 28n of the power line 28, or the switching device 32 may not be provided.

[0053] In the above embodiment, the drive unit is configured to be mounted on a battery electric vehicle 10 equipped with a motor 20, but it is not limited to this. For example, it can also be configured to be mounted on a hybrid electric vehicle equipped with an engine in addition to a motor. Alternatively, it can be configured to be mounted on a fuel cell electric vehicle equipped with a fuel cell in addition to a motor. Furthermore, it can also be configured to be mounted on a drive unit for mobile bodies other than vehicles, stationary construction equipment, etc.

[0054] This section explains the correspondence between the main elements of the implementation method and the main elements of the invention described in the invention description. In the implementation method, the battery 26 corresponds to "energy storage device", the motor 20 corresponds to "motor", the first and second inverters 22 and 24 correspond to "first and second inverters", the cooling device 40 corresponds to "cooling device", and the ECU 50 corresponds to "control device".

[0055] Furthermore, the correspondence between the main elements of the implementation method and the main elements of the invention described in the invention summary is merely an example used to specifically illustrate the manner in which the invention described in the invention summary is implemented in the implementation method, and therefore does not limit the elements of the invention described in the invention summary. That is, the interpretation of the invention described in the invention summary should be based on the description in that section, and the implementation method is merely a specific example of the invention described in the invention summary.

[0056] The above describes a method for implementing this disclosure, but this disclosure is not limited to such implementation methods at all, and can of course be implemented in various ways without departing from the spirit of this disclosure.

[0057] This disclosure can be used in industries such as the manufacturing of drive devices.

Claims

1. A driving device comprising: Energy storage devices; The motor has three-phase coils; The first inverter is connected to the power line to which the energy storage device is connected and to one end of the three-phase coil and has a plurality of first switching elements; The second inverter is connected to the power line and to the other end of the three-phase coil and has a plurality of second switching elements; A cooling device that uses a cooling medium to cool the energy storage device, the motor, the first inverter, and the second inverter; as well as The control device controls the first inverter and the second inverter according to the torque command of the motor. The control device controls the first inverter and the second inverter in such a way that the direction of the phase current of two phases in the three-phase coil of the motor is from one inverter of the first inverter and the second inverter toward the other inverter, and the direction of the phase current of one phase in the three-phase coil of the motor other than the two phases is opposite to the direction of the phase current of the two phases.

2. The driving device according to claim 1, wherein, A load device having at least one of the positive and negative poles of the power line installed.

3. The driving device according to claim 1 or 2, wherein, The control device performs feedback control on the first inverter and the second inverter in such a way that the current of each phase of the motor becomes the current required for the heat generated by the energy storage device.

4. The driving device according to claim 1 or 2, wherein, The control device sets the d-axis and q-axis current commands in such a way that the zero-phase current, which is the sum of the currents of each phase of the motor, flows through the motor according to the required heat demand of the energy storage device, and makes the zero-phase current, which is the sum of the currents of each phase of the motor, the current command for each phase is set according to the current commands for the d-axis and q-axis, and uses the voltage commands for each phase to control the first inverter and the second inverter.

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