Motor controller, powertrain and electric vehicle

Abstract

The application provides a motor controller, a power assembly and an electric vehicle. The motor controller comprises a direct-current input port, an alternating-current output port, an inverter circuit and a disconnecting device. The direct-current input port is used for connecting a power battery, and the alternating-current output port is used for connecting a motor. The inverter circuit is used for converting direct-current power output by the power battery into alternating-current power to supply the motor with power. The inverter circuit comprises six bridge arms in parallel. Two ends of the six bridge arms are used for receiving the direct-current power through the direct-current input port. Bridge arm midpoints of the six bridge arms are used for outputting the alternating-current power through the alternating-current output port. The disconnecting device is used for turning on or off the connection between the bridge arm midpoints of each of the six bridge arms and the motor. The motor controller has high safety and reliability.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electric vehicles, in particular to a motor controller, a powertrain and an electric vehicle. BACKGROUND

[0002] The motor controller (MCU) is a component in an electric vehicle for controlling the driving motor. The motor controller can convert the direct current provided by the power battery into alternating current required for the driving motor to work, so that the driving motor outputs torque to drive the electric vehicle. Therefore, how to improve the safety and reliability of the motor controller, thereby improving the driving experience of the electric vehicle, is a problem to be solved at present. SUMMARY

[0003] The motor controller, the powertrain and the electric vehicle provided by the embodiments of the present application can connect the six bridge arms in the motor controller to the motor winding through the disconnecting device, the disconnecting device can turn on or turn off the connection between the bridge arm midpoint of the bridge arm in the motor controller and the motor, and the safety and reliability of the motor controller are high.

[0004] In a first aspect, a motor controller is provided, which includes a direct current input port, an alternating current output port, an inverter circuit and a disconnecting device. The direct current input port is used to connect a power battery, and the alternating current output port is used to connect a motor. The inverter circuit is used to convert the direct current output by the power battery into alternating current to power the motor. The inverter circuit includes six bridge arms in parallel, two ends of the six bridge arms are used to receive the direct current through the direct current input port, and the bridge arm midpoints of the six bridge arms are used to output the alternating current through the alternating current output port. The disconnecting device is used to turn on or turn off the connection between the bridge arm midpoint of each bridge arm of the six bridge arms and the motor.

[0005] It should be understood that the embodiments of the present application do not limit the specific type of the disconnecting device. As an example but not limitation, the disconnecting device can be a circuit breaker, a fuse, a relay, etc., and the specific type thereof can be selected according to actual implementation.

[0006] As an example but not limitation, the disconnecting device can be assembled inside the motor controller, connected between the inverter circuit and the alternating current output port, and has high integration.

[0007] As an example but not limitation, the disconnecting device can be assembled outside the housing of the motor controller, for example, fixed on the housing of the motor controller by welding, bolts, sliding rails, adhesion, etc., or assembled on the high-voltage wire harness between the motor controller and the driving motor, connected between the alternating current output port of the motor controller and the driving motor, and convenient to disassemble and maintain.

[0008] It can be understood that the positions of the DC input port and the AC output port on the surface of the housing of the motor controller can be flexibly set according to specific implementation, and the embodiments of the present application do not limit this.

[0009] Based on the above scheme, the motor controller can turn on or turn off the connection between the bridge arm midpoint of the six bridge arms and the motor through the breaking device, and the safety and reliability of the motor controller are high.

[0010] In combination with the first aspect, in some implementations of the first aspect, the motor includes one driving motor, the one driving motor includes six-phase windings, and each midpoint of the bridge arms is configured to connect one phase winding of the one driving motor through the breaking device.

[0011] Based on the above scheme, the midpoints of the six bridge arms in the motor controller can be connected to one phase winding of the six-phase motor respectively, so as to drive the six-phase motor, and the motor controller has strong practicability.

[0012] In combination with the first aspect, in some implementations of the first aspect, the motor controller further includes a control device, when one or more phase windings of the one driving motor fail, the breaking device is configured to disconnect the connection between the corresponding bridge arm of the one or more phase windings and the one or more phase windings, and the control device is configured to control the corresponding bridge arm of the one or more phase windings to turn off and control the remaining bridge arms to continue to output AC power.

[0013] It should be understood that the control device can perform six-phase control on the switch tubes in the inverter circuit, or the control device can perform double three-phase control on the switch tubes in the inverter circuit, and the embodiments of the present application do not limit this.

[0014] It should be understood that controlling the bridge arm to turn off can be understood as controlling the switch tubes in the bridge arm to continuously turn off.

[0015] Based on the above scheme, the breaking device can disconnect the connection between the failed motor winding and the bridge arm midpoint connected thereto when the driving motor fails, so as to avoid the spread of the failure and protect the power devices in the motor controller. At the same time, the control device can control the corresponding bridge arm of the failed motor winding to turn off and control the remaining bridge arms to continue to output AC power when the driving motor fails, so that the power output by the driving motor is not interrupted, thereby avoiding the lack of power caused by winding failure, and further improving the safety and reliability of the motor controller.

[0016] In some embodiments of the first aspect, when the torque output by the one driving motor is less than or equal to a first preset torque value, the control device is further configured to control three of the six bridge arms to be in operation and the other three bridge arms to be turned off. When the torque output by the one driving motor is greater than the first preset torque value and less than or equal to a second preset torque value, the control device is further configured to control four of the six bridge arms to be in operation and the other two bridge arms to be turned off. When the torque output by the one driving motor is greater than the second preset torque value and less than or equal to a third preset torque value, the control device is further configured to control five of the six bridge arms to be in operation and the other one bridge arm to be turned off. When the torque output by the one driving motor is greater than the third preset torque value, the control device is further configured to control all the six bridge arms to be in operation.

[0017] It should be understood that the embodiments of the present application do not limit the specific values of the first preset torque value, the second preset torque value, and the third preset torque value. For example, the above-mentioned preset torque values can be determined in a calibration process or input by a user during use, and the embodiments of the present application do not limit this.

[0018] It should be understood that the control device can further adjust the control strategy of the inverter circuit according to the effective value of the current in the winding and / or the output power of the driving motor, without limitation.

[0019] Based on the above scheme, the control device can adjust the control strategy of the six bridge arms in the inverter circuit according to the torque required to be output by the driving motor, thereby reducing the energy consumption of the motor controller and improving the efficiency while meeting the torque requirement.

[0020] In some embodiments of the first aspect, when the torque output by the one driving motor is less than or equal to a first preset torque value, the disconnecting device is specifically configured to disconnect the connection between the bridge arm midpoint of the other three bridge arms and the one driving motor. When the torque output by the one driving motor is greater than the first preset torque value and less than or equal to a second preset torque value, the disconnecting device is specifically configured to disconnect the connection between the bridge arm midpoint of the other two bridge arms and the one driving motor. When the torque output by the one driving motor is greater than the second preset torque value and less than or equal to a third preset torque value, the disconnecting device is specifically configured to disconnect the connection between the bridge arm midpoint of the one bridge arm and the one driving motor.

[0021] Based on the above scheme, while the control device can adjust the control strategy of the six bridge arms in the inverter circuit according to the torque required to be output by the driving motor, the disconnecting device can disconnect the connection between the bridge arm midpoint of the bridge arm to be turned off and the corresponding motor winding, thereby further improving the safety and reliability of the motor controller.

[0022] With reference to the first aspect, in some implementations of the first aspect, the motor includes a first drive motor and a second drive motor, each of the first drive motor and the second drive motor being a three-phase motor, and the AC output port includes a first AC output port and a second AC output port. The bridge arm midpoints of three of the six bridge arms are configured to connect to three-phase windings of the first drive motor, and the bridge arm midpoints of the other three of the six bridge arms are configured to connect to three-phase windings of the second drive motor. The three bridge arms are configured to output a first three-phase current to the first drive motor through the first AC output port, and the other three bridge arms are configured to output a second three-phase current to the second drive motor through the second AC output port.

[0023] Based on the above scheme, the bridge arm midpoints of the three bridge arms in the motor controller can be connected to the first drive motor through the first AC output port, and the bridge arm midpoints of the other three bridge arms in the motor controller can be connected to the second drive motor through the second AC output port, so as to drive the first drive motor and / or the second drive motor, and the motor controller has strong practicability.

[0024] With reference to the first aspect, in some implementations of the first aspect, the motor includes a drive motor and a generator, and the AC output port includes a drive motor interface and a generator interface. The bridge arm midpoints of three of the six bridge arms are configured to connect to three-phase windings of the drive motor, and the bridge arm midpoints of the other three of the six bridge arms are configured to connect to three-phase windings of the generator. The three bridge arms are configured to output a third three-phase current to the drive motor through the drive motor interface, and the other three bridge arms are configured to receive a fourth three-phase current output by the generator through the generator interface.

[0025] Based on the above scheme, the bridge arm midpoints of the three bridge arms in the motor controller can be connected to the generator through the generator interface, and the bridge arm midpoints of the other three bridge arms in the motor controller can be connected to the drive motor through the drive motor interface, so as to receive power supply from the generator, charge the power battery, and drive the drive motor, and the motor controller has strong practicability.

[0026] With reference to the first aspect, in some implementations of the first aspect, the motor controller further includes a control device, and during the process in which the three bridge arms are configured to output the third three-phase AC current and the other three bridge arms are configured to receive the fourth three-phase current, the control device is configured to control the turn-on and turn-off of the bridge arms in the three bridge arms and the other three bridge arms at the same frequency.

[0027] Based on the above scheme, the motor controller can control the three bridge arms connected to the generator and the three bridge arms connected to the drive motor at the same frequency, so as to reduce interference between power devices and improve the efficiency of the motor controller.

[0028] With reference to the first aspect, in some implementations of the first aspect, the motor includes a three-phase winding, the six bridge arms include three groups of bridge arms, and a midpoint of two bridge arms in each group of bridge arms is connected to connect the three-phase winding through the disconnection device and the alternating current output port.

[0029] Based on the above scheme, the six bridge arms can be divided into three groups of bridge arms, and the midpoints of two bridge arms in each group of bridge arms are connected in parallel to connect a phase winding of the three-phase motor, so that the inverter circuit can support the motor to operate at a larger power, and the motor controller has strong practicability.

[0030] With reference to the first aspect, in some implementations of the first aspect, when the current through any one of the six bridge arms is greater than a fourth current threshold, the disconnection device is further configured to disconnect the connection between the any one of the bridge arms and the motor.

[0031] Based on the above scheme, the disconnection device can disconnect the connection between the midpoint of the faulty bridge arm and the motor winding connected thereto when a fault occurs in the bridge arm in the inverter circuit, thereby avoiding the spread of the fault, protecting the power devices in the motor controller, and further improving the safety and reliability of the motor controller.

[0032] The second aspect provides a power assembly, which includes a motor controller and a motor. The motor controller includes a direct current input port, an alternating current output port, an inverter circuit, and a disconnection device. The direct current input port is configured to be connected to a power battery, and the alternating current output port is configured to be connected to the motor. The inverter circuit is configured to convert direct current output by the power battery into alternating current to supply power to the motor. The inverter circuit includes six bridge arms connected in parallel, two ends of the six bridge arms are configured to receive the direct current through the direct current input port, and the midpoint of the bridge arm of the six bridge arms is configured to output the alternating current through the alternating current output port. The disconnection device is configured to turn on or disconnect the connection between the midpoint of the bridge arm of each of the six bridge arms and the motor.

[0033] Based on the above scheme, the motor controller can turn on or turn off the connection between the midpoint of the bridge arm of the six bridge arms and the motor through the disconnection device, and the safety and reliability of the power assembly are high.

[0034] With reference to the second aspect, in some implementations of the second aspect, the motor includes one driving motor, the one driving motor includes a six-phase winding, and the midpoint of each bridge arm is configured to be connected to one phase winding of the one driving motor through the disconnection device. The motor controller further includes a control device. When one or more phase windings of the one driving motor fail, the disconnection device is configured to disconnect the connection between the one or more phase windings and the bridge arm corresponding to the one or more phase windings, and the control device is configured to control the bridge arm corresponding to the one or more phase windings to turn off and control the remaining bridge arms to continue outputting alternating current.

[0035] With reference to the second aspect, in some implementations of the second aspect, when the torque output by the one driving motor is less than or equal to a first preset torque value, the control device is further configured to control three of the six bridge arms to be in operation and control the other three bridge arms to be in off state. When the torque output by the one driving motor is greater than the first preset torque value and less than or equal to a second preset torque value, the control device is further configured to control four of the six bridge arms to be in operation and control the other two bridge arms to be in off state. When the torque output by the one driving motor is greater than the second preset torque value and less than or equal to a third preset torque value, the control device is further configured to control five of the six bridge arms to be in operation and control the other one bridge arm to be in off state. When the torque output by the one driving motor is greater than the third preset torque value, the control device is further configured to control all of the six bridge arms to be in operation.

[0036] With reference to the second aspect, in some implementations of the second aspect, when the torque output by the one driving motor is less than or equal to a first preset torque value, the disconnecting device is specifically configured to disconnect the connection between the bridge arm midpoints of the other three bridge arms and the one driving motor. When the torque output by the one driving motor is greater than the first preset torque value and less than or equal to a second preset torque value, the disconnecting device is specifically configured to disconnect the connection between the bridge arm midpoints of the other two bridge arms and the one driving motor. When the torque output by the one driving motor is greater than the second preset torque value and less than or equal to a third preset torque value, the disconnecting device is specifically configured to disconnect the connection between the bridge arm midpoint of the one bridge arm and the one driving motor.

[0037] With reference to the second aspect, in some implementations of the second aspect, the power assembly is a distributed power assembly, the motor includes a first driving motor and a second driving motor, the first driving motor and the second driving motor are both three-phase motors, and the AC output port includes a first AC output port and a second AC output port. The bridge arm midpoints of the three bridge arms of the six bridge arms are configured to be connected to the three-phase windings of the first driving motor, and the bridge arm midpoints of the other three bridge arms of the six bridge arms are configured to be connected to the three-phase windings of the second driving motor. The three bridge arms are configured to output a first three-phase current to the first driving motor through the first AC output port, and the other three bridge arms are configured to output a second three-phase current to the second driving motor through the second AC output port.

[0038] In some implementations of the second aspect, the power assembly is a hybrid power assembly, the electric machine includes a drive motor and a generator, and the AC output port includes a drive motor interface and a generator interface. The bridge leg midpoints of three of the six bridge legs are configured to connect to three-phase windings of the drive motor, and the bridge leg midpoints of the other three of the six bridge legs are configured to connect to three-phase windings of the generator. The three bridge legs are configured to output a third three-phase current to the drive motor through the drive motor interface, and the other three bridge legs are configured to receive a fourth three-phase current output by the generator through the generator interface.

[0039] In some implementations of the second aspect, the disconnection device is further configured to disconnect the connection between any one of the six bridge legs and the electric machine when a current through the any one of the six bridge legs is greater than a fourth current threshold.

[0040] In some implementations of the third aspect, the power assembly is a distributed power assembly, the electric machine includes a first drive motor and a second drive motor, the first drive motor and the second drive motor are each a three-phase motor, and the AC output port includes a first AC output port and a second AC output port. The bridge leg midpoints of three of the six bridge legs are configured to connect to three-phase windings of the first drive motor, and the bridge leg midpoints of the other three of the six bridge legs are configured to connect to three-phase windings of the second drive motor. The three bridge legs are configured to output a first three-phase current to the first drive motor through the first AC output port, and the other three bridge legs are configured to output a second three-phase current to the second drive motor through the second AC output port.

[0041] In some implementations of the third aspect, the power assembly is a distributed power assembly, the electric machine includes a first drive motor and a second drive motor, the first drive motor and the second drive motor are each a three-phase motor, and the AC output port includes a first AC output port and a second AC output port. The bridge leg midpoints of three of the six bridge legs are configured to connect to three-phase windings of the first drive motor, and the bridge leg midpoints of the other three of the six bridge legs are configured to connect to three-phase windings of the second drive motor. The three bridge legs are configured to output a first three-phase current to the first drive motor through the first AC output port, and the other three bridge legs are configured to output a second three-phase current to the second drive motor through the second AC output port.

[0042] With reference to the third aspect, in some implementations of the third aspect, the powertrain is a hybrid powertrain, the electric machine includes a drive motor and a generator, and the AC output port includes a drive motor interface and a generator interface. The bridge arm midpoints of three of the six bridge arms are configured to connect to three-phase windings of the drive motor, and the bridge arm midpoints of the other three of the six bridge arms are configured to connect to three-phase windings of the generator. The three bridge arms are configured to output a third three-phase current to the drive motor via the drive motor interface, and the other three bridge arms are configured to receive a fourth three-phase current output by the generator via the generator interface.

[0043] In addition to the above-mentioned supplementary and technical effects of the solutions provided by the second aspect and the third aspect, reference can be made to the corresponding descriptions of the first aspect, and details are not repeated. BRIEF DESCRIPTION OF DRAWINGS

[0044] Figure 1 is a schematic diagram of several possible electric vehicle 10 architectures provided by the present application;

[0045] Figure 2 is a schematic diagram of a powertrain 120 provided by an embodiment of the present application;

[0046] Figure 3 is another schematic diagram of a powertrain 120 provided by an embodiment of the present application;

[0047] Figure 4 is a schematic diagram of a distributed powertrain 130 provided by an embodiment of the present application;

[0048] Figure 5 is a schematic diagram of a hybrid powertrain 140 provided by an embodiment of the present application. DETAILED DESCRIPTION

[0049] The technical solutions in the present application will be described below with reference to the accompanying drawings.

[0050] In the description of the embodiments of the present application, unless otherwise specified, " / " represents the meaning of or, for example, A / B can represent A or B; "and / or" in this document is only a description of the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B, which can represent: A exists alone, A and B exist together, and B exists alone.

[0051] The prefix words such as "first", "second" are used in the embodiments of the present application only to distinguish different description objects, and have no limiting effect on the position, order, priority, quantity or content of the described objects. The use of ordinal words such as ordinal words in the embodiments of the present application does not constitute a limitation on the described objects, and the description of the described objects should be referred to the description of the context in the claims or embodiments, and should not constitute redundant limitation because of the use of such prefix words. In addition, in the description of the embodiments, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0052] In the description of the present application, the reference to "some embodiments" and the like means that the specific features, structures or characteristics described in connection with the embodiments are included in one or more embodiments of the present application. Therefore, the statements "in some embodiments" and the like appearing in different places in the specification are not necessarily all referring to the same embodiments, but mean "one or more but not all embodiments", unless otherwise specifically emphasized. The terms "include", "contain", "have" and their variants mean "include but not limited to", unless otherwise specifically emphasized.

[0053] The motor control unit (MCU) is a component in an electric vehicle for controlling the driving motor. The motor control unit can convert the direct current provided by the power battery into alternating current required for the driving motor to work, so that the driving motor outputs torque to drive the electric vehicle to move. The motor control unit generally has an inverter with a topology of three-phase full-bridge, and controls the conduction and turn-off of the switch tube on each bridge arm in the inverter circuit through sinusoidal pulse width modulation (SPWM), space vector pulse width modulation (SVPWM), discontinuous pulse width modulation (DPWM) and other strategies, so as to realize the conversion of direct current into alternating current, thereby realizing the control of different torque and speed of the driving motor.

[0054] In certain special circumstances, such as a short circuit in the inverter circuit of the motor controller or a fault in one phase winding of the drive motor, it is necessary to prevent the drive motor from stopping and causing a loss of power in the electric vehicle. One common solution is to control the drive motor to operate with a single phase, achieving short-term low-speed limpness in the electric vehicle and reducing safety hazards. Another common solution is to adopt a redundant multi-motor scheme, where each motor is controlled by a different motor controller. This allows the faulty motor to be shut down when it fails; however, the presence of a faulty arm or winding will generate significant fluctuating torque, causing the electric vehicle to operate with speed and torque limitations.

[0055] In view of this, embodiments of this application provide a motor controller, a powertrain, and an electric vehicle. The six arms of the motor controller can be connected to the motor windings via a disconnecting device. This disconnecting device can connect or disconnect the connection between the midpoint of the arm and the motor, thereby improving the safety and reliability of the motor controller.

[0056] Figure 1 These are schematic diagrams of several possible electric vehicle architectures provided in this application.

[0057] like Figure 1 As shown in (a), the electric vehicle 10 may include a power battery 110. Figure 1 (Not shown in the image) Powertrain 120 and four wheels. The powertrain 120 includes a drive motor 121 and a motor controller 122. The motor controller 122 outputs AC power to the drive motor 121 to drive the drive motor 121, so that the drive motor 121 drives the two front wheels or the two rear wheels of the electric vehicle 10 to rotate.

[0058] In this embodiment, the motor controller 122 includes six parallel-connected bridge arms. In some possible embodiments, the drive motor 121 is a six-phase motor, and the midpoint of each bridge arm in the motor controller 122 is used to connect to one phase winding of the drive motor 121. In other possible embodiments, the drive motor 121 is a three-phase motor, and the six bridge arms in the motor controller 122 are divided into three groups of bridge arms, with the midpoints of two bridge arms in each group connected in parallel to one phase winding of the drive motor 121.

[0059] It should be understood that the electric vehicle 10 in the embodiments of the present application can be any one of different types of automobiles such as a sedan, a truck, a passenger bus, etc., and can also be a three-wheeled vehicle, a two-wheeled vehicle, a train, etc., a transportation device for carrying people or goods, or other types of transportation tools driven by a power battery, and the embodiments of the present application do not limit the electric vehicle. The electric vehicle includes but is not limited to a pure electric vehicle (battery electric vehicle, pure EV / battery EV), a hybrid electric vehicle (HEV), a range-extended electric vehicle (REEV), a plug-in hybrid electric vehicle (PHEV), a new energy vehicle (NEV), etc.

[0060] It should be noted that the "connection" in the embodiments of the present application can be understood as an electrical connection, and the connection between two electrical elements can be a direct or indirect connection between the two electrical elements. For example, A and B are connected, which can be that A and B are directly connected, or A and B are indirectly connected through one or more other electrical elements. For example, A and B are connected, which can be that A and B are directly connected, or A and B are indirectly connected through one or more other electrical elements. For example, A and B are connected, which can be that A and B are directly connected, or A and B are indirectly connected through C. In some scenarios, "connection" can also be understood as coupling, such as electromagnetic coupling between two inductors. In summary, the connection between A and B can enable the transmission of electrical energy between A and B.

[0061] It should be understood that the embodiments of the present application do not limit the specific type of the power assembly 120, and as an example but not limitation, the above power assembly can be a centralized power assembly, or a hub motor power assembly or a wheel motor power assembly. The hub motor power assembly is to directly set the motor and the reducer in the rim, and cancel the transmission components such as the half shaft, the universal joint, the differential, the transmission, etc.; the wheel motor power assembly is to set the motor on the subframe.

[0062] As shown in (b) of FIG. 1, Figure 1 The electric vehicle 10 can include a power battery 110 Figure 1(Not shown in the diagram) A distributed powertrain 130 and four wheels. The distributed powertrain 130 includes a first drive motor 131, a second drive motor 132, and a motor controller 133. The first drive motor 131 and the second drive motor 132 drive either the two front wheels or the two rear wheels. The motor controller 133 outputs AC power to the first drive motor 131 and the second drive motor 132 to drive the two drive motors. The motor controller 133 includes six arms; the midpoints of three arms are used to connect to the three-phase windings of the first drive motor 131, and the midpoints of the other three arms are used to connect to the three-phase windings of the second drive motor 132.

[0063] like Figure 1 As shown in (c), the electric vehicle 10 can be a hybrid electric vehicle, and the electric vehicle 10 includes a power battery 110. Figure 1 (Not shown in the image) A hybrid powertrain 140 and four wheels. The hybrid powertrain includes a generator 141, a drive motor 142, and a motor controller 143. The motor controller 143 includes six arms, with the midpoints of three arms used to connect to the three-phase windings of the generator 141, and the midpoints of the other three arms used to connect to the three-phase windings of the drive motor 142.

[0064] It should be understood that the power battery 110 in the embodiments of this application can be a lithium-ion battery, lithium metal battery, lead-acid battery, nickel-cadmium battery, nickel-metal hydride battery, lithium-sulfur battery, lithium-air battery, or sodium-ion battery, etc., and this application does not limit it in this regard. In terms of scale, the power battery 110 in the embodiments of this application can be a single cell, a battery module, or a battery pack, and this application does not limit it in this regard. The power battery 110 can also supply power to other electrical devices in the electric vehicle, such as in-vehicle air conditioning and in-vehicle media players.

[0065] Figure 2 This is a schematic diagram of a powertrain 120 provided in an embodiment of this application.

[0066] like Figure 2 As shown, the powertrain 120 includes a drive motor 121 and a motor controller 122. The motor controller 122 includes an inverter circuit 1221 and a disconnecting device 1222. The inverter circuit 1221 includes six arms, and the drive motor 121 includes six-phase windings. The midpoint of each arm in the inverter circuit 1221 is used to connect one phase winding of the drive motor 121 via the disconnecting device 1222.

[0067] In some possible embodiments, reference Figure 2The inverter circuit 1221 includes bridge arm 1 to bridge arm 6. The bridge arm 1 includes switch tube Q1 and switch tube Q2, and the midpoint of the bridge arm 1 is coupled to winding N1 of the driving motor 121. The bridge arm 2 includes switch tube Q3 and switch tube Q4, and the midpoint of the bridge arm 2 is coupled to winding N2 of the driving motor 121. The bridge arm 3 includes switch tube Q5 and switch tube Q6, and the midpoint of the bridge arm 3 is coupled to winding N3 of the driving motor 121. The bridge arm 4 includes switch tube Q7 and switch tube Q8, and the midpoint of the bridge arm 4 is coupled to winding N4 of the driving motor 121. The bridge arm 5 includes switch tube Q9 and switch tube Q10, and the midpoint of the bridge arm 5 is coupled to winding N5 of the driving motor 121. The bridge arm 6 includes switch tube Q11 and switch tube Q12, and the midpoint of the bridge arm 6 is coupled to winding N6 of the driving motor 121.

[0068] It should be noted that the switch tubes and switches in the embodiments of the present application can be one or more of a plurality of types of switch tubes such as relays, metal oxide semiconductor field effect transistors (MOSFETs), bipolar junction transistors (BJTs), insulated gate bipolar transistors (IGBTs), etc., and the embodiments of the present application will not be enumerated one by one. Each switch tube includes a first electrode, a second electrode, and a control electrode, wherein the control electrode is used to control the conduction or disconnection of the switch tube. When the switch tube is conducting, current can be transmitted between the first electrode and the second electrode of the switch tube, and when the switch tube is disconnected, current cannot be transmitted between the first electrode and the second electrode of the switch tube. Taking a MOSFET tube as an example, the control electrode of the switch tube is the gate electrode, the first electrode of the switch tube can be the source electrode of the switch tube, and the second electrode can be the drain electrode of the switch tube, or the first electrode can be the drain electrode of the switch tube, and the second electrode can be the source electrode of the switch tube.

[0069] In some possible embodiments, the motor controller 122 further includes a control device 1223, which can be connected to the control electrodes of the switch tubes in the inverter circuit 1221 to control the conduction and disconnection of the switch tubes, so that the inverter circuit 1221 outputs the required alternating current to the motor windings of the driving motor 121. The control device 1223 can perform six-phase control on the switch tubes in the inverter circuit 1221, or the control device 1223 can perform double three-phase control on the switch tubes in the inverter circuit 1221, and the embodiments of the present application will not be limited.

[0070] In some possible embodiments, the inverter circuit 1221 further comprises a capacitor C1 connected in parallel across the six bridge arms. It can be understood that the capacitor C1 can receive the voltage of the power battery 110 as a bus capacitor and transmit to the inverter circuit 1221.

[0071] It can be understood that the motor controller 122 further comprises a housing for accommodating the inverter circuit 1221 and the disconnection device 1222, the housing comprising a DC input port 122a and an AC output port 122b. The DC input port is used to connect the power battery 110, and the input end of the inverter circuit 1221 (i.e. the two ends of the six bridge arms) is connected to the DC input port 122a. The AC output port is used to connect the six-phase winding of the driving motor 121, and the output end of the inverter circuit 1221 (i.e. the midpoint of each bridge arm) is connected to the six-phase winding of the driving motor 121 through the disconnection device 1222 and the AC port 122b, thereby outputting AC power to the driving motor 121.

[0072] It can be understood that the positions of the DC input port 122a and the AC output port 122b on the surface of the housing of the motor controller 122 can be flexibly set according to specific implementations, and the embodiments of the present application do not limit this. In some possible embodiments, the DC input port 122a and the AC output port 122b can be located on the same side of the housing, or the DC input port 122a can be located on one side a of the housing, and the AC output port 122b can be located on the side b opposite to the side a.

[0073] In the embodiments of the present application, the disconnection device 1223 is used to turn on or turn off the connection between the bridge arm midpoint of each of the six bridge arms and the driving motor 121, in other words, the disconnection device 1223 can independently control the turn-on and turn-off between the bridge arm midpoint of each bridge arm and the motor winding of the driving motor 121 connected thereto. The disconnection device can comprise a controlled switching device such as a switch tube, a relay, etc., or an automatic over-current detection and fuse device such as a fuse, a fuse, etc., and the present application does not limit this. It can be understood that when the disconnection device is a controlled switching device, it can be connected with the control device in the motor controller and controlled by the control device, or it can be connected with a separate control device and controlled independently by the control device.

[0074] In some possible embodiments, the disconnection device 1222 can be assembled inside the motor controller 122, connected between the inverter circuit 1221 and the AC output port, and has high integration. In some other possible embodiments, the disconnection device 1222 can be assembled outside the housing of the motor controller 122, for example, fixed on the housing of the motor controller 122 by welding, by bolts, by sliding rails, by adhesion, or the like, or assembled on a high-voltage wire harness between the motor controller 122 and the driving motor 121, connected between the AC output port of the motor controller 122 and the driving motor 121, and convenient for disassembly and maintenance.

[0075] In the embodiments of the present application, when a phase or multiple phases of the winding of the driving motor 121 fail, the disconnection device 1222 can disconnect the connection between the failed motor winding and the midpoint of the bridge arm in the motor controller 122 connected thereto.

[0076] By way of example but not limitation, when the winding N1 in the driving motor 121 fails, the disconnection device 1222 can disconnect the connection between the winding N1 and the midpoint of the bridge arm 1, thereby avoiding the spread of the failure of the winding N1 and achieving protection of the switch Q1 and the switch Q2 in the bridge arm 1.

[0077] By way of example but not limitation, when the winding N2, the winding N3 and the winding N4 in the driving motor 121 fail, the disconnection device 1222 can disconnect the connection between the winding N2 and the midpoint of the bridge arm 2, between the winding N3 and the midpoint of the bridge arm 3, and between the winding N4 and the midpoint of the bridge arm 4, thereby avoiding the spread of the failure of the driving motor 121 and achieving protection of the switches Q3 to Q8 in the bridge arm 2, the bridge arm 3 and the bridge arm 4.

[0078] Based on the above scheme, the disconnection device 1222 can disconnect the connection between the failed motor winding and the midpoint of the bridge arm connected thereto when the driving motor 121 fails, avoid the spread of the failure, and thereby protect the power devices in the motor controller 122.

[0079] Further, in response to the disconnection device 1222 disconnecting the connection between the faulty motor winding and the midpoint of the bridge arm of the motor controller 122 connected thereto, the control device 1223 controls the switch tubes in the bridge arm connected with the faulty motor winding to remain off, and controls the remaining bridge arms to continue outputting alternating current. In other words, when one phase winding of the driving motor 121 is faulty, the control device 1223 can perform five-phase motor control on the inverter circuit 1221; when two phase windings of the driving motor 121 are faulty, the control device 1223 can perform four-phase motor control on the inverter circuit 1221; when three phase windings of the driving motor 121 are faulty, the control device 1223 can perform three-phase motor control on the inverter circuit 1221; and when four phase windings of the driving motor 121 are faulty, the control device 1223 can perform two-phase motor control on the inverter circuit 1221.

[0080] By way of example but not limitation, when the disconnection device 1222 disconnects the connection between the faulty motor winding N1 and the midpoint of the bridge arm 1, the control device 1223 controls the switch tube Q1 and the switch tube Q2 in the bridge arm 1 to remain off, and controls the switch tubes in the bridge arms 2 to 6 to continue outputting alternating current to the corresponding motor windings N2 to N6. In other words, in response to the disconnection between the motor winding N1 and the midpoint of the bridge arm 1, the control device 1222 can switch the control strategy of the inverter circuit 1221 to five-phase control, so that the driving motor 121 can operate with a missing phase, thereby avoiding power loss due to winding failure.

[0081] By way of example but not limitation, when the disconnection device 1222 disconnects the connection between the faulty motor winding N2 and the midpoint of the bridge arm 2, the connection between the motor winding N3 and the midpoint of the bridge arm 3, and the connection between the motor winding N4 and the midpoint of the bridge arm 4, the control device 1223 controls the switch tube Q3 and the switch tube Q4 in the bridge arm 2, the switch tube Q5 and the switch tube Q6 in the bridge arm 3, and the switch tube Q7 and the switch tube Q8 in the bridge arm 4 to remain off, and controls the switch tubes in the bridge arms 1, 5 and 6 to continue outputting alternating current to the corresponding motor windings. In other words, in response to the disconnection between the motor winding N2 and the midpoint of the bridge arm 2, the connection between the motor winding N3 and the midpoint of the bridge arm 3, and the connection between the motor winding N4 and the midpoint of the bridge arm 4, the control device 1222 can switch the control strategy of the inverter circuit 1221 to three-phase control, so that the driving motor 121 can operate with a missing phase, thereby avoiding power loss due to winding failure.

[0082] Based on the above scheme, the motor controller 122 can ensure that the alternating current can be continuously output to the driving motor 121 by switching the control strategy of the inverter circuit 1221 when one or more phase windings of the driving motor fail, thereby avoiding power loss due to winding failure, high safety and strong reliability.

[0083] In some possible embodiments, when one or more bridge arms in the inverter circuit 1221 fail, the disconnection device 1222 can disconnect the connection between the midpoint of the failed bridge arm and the motor winding of the driving motor 121 connected thereto. Wherein, the bridge arm failure can be understood as the short circuit failure of the switch tube in the bridge arm.

[0084] By way of example but not limitation, when the bridge arm 1 in the inverter circuit 1221 fails, the disconnection device 1222 can disconnect the connection between the midpoint of the bridge arm 1 and the winding N1 in the driving motor 121, thereby avoiding the spread of the failure of the bridge arm 1 and achieving the protection of the motor winding N1.

[0085] By way of example but not limitation, when the bridge arm 2, the bridge arm 3 and the bridge arm 4 in the inverter circuit 1221 fail, the disconnection device 1222 can disconnect the connection between the midpoint of the bridge arm 2 and the winding N2, the midpoint of the bridge arm 3 and the winding N3, and the midpoint of the bridge arm 4 and the winding N4, thereby avoiding the spread of the failure of the bridge arm 2, the bridge arm 3 and the bridge arm 4, and achieving the protection of the windings N2, N3 and N4 of the driving motor 121.

[0086] Based on the above scheme, the disconnection device 1222 can disconnect the connection between the midpoint of the failed bridge arm and the motor winding connected thereto when the inverter circuit 1221 fails, thereby avoiding the spread of the failure and protecting the power device in the motor controller 122.

[0087] Further, in response to the failure of one or more bridge arms in the inverter circuit 1221, the control device 1223 controls the switch tube in the failed bridge arm to be continuously disconnected and controls the remaining bridge arms to continue outputting alternating current. It can be understood that the specific implementation can refer to the related content described above, which will not be described here.

[0088] In some possible embodiments, during the operation of the power assembly 120, the control device 1223 can also adjust the control strategy of the inverter circuit 1221 according to the torque required to be output by the driving motor 121, so as to reduce the energy consumption of the motor controller 122 and improve the efficiency while meeting the torque requirement. In other words, the embodiments of the present application can divide the torque required to be output by the driving motor 121 into different working gears, and the control device 1223 can match different control strategies for different working gears, and use different control strategies in actual use to make the driving motor 121 work in the corresponding working gear.

[0089] It can be understood that the embodiments of the present application do not limit the number of working gears obtained by division. The following is described by taking the torque required to be output by the driving motor 121 as an example and dividing it into four working gears.

[0090] Gear 1: When the torque output by the driving motor 121 is less than or equal to a first preset torque value, the control device 1223 controls three of the six bridge arms to work and controls the remaining three bridge arms to be turned off. That is, the control device 1223 controls the conduction and turn-off of the switch tubes in the three bridge arms to output alternating current to the driving motor 121, and controls the switch tubes in the remaining three bridge arms to be continuously turned off. It can be understood that the alternating current output by the three bridge arms can make the maximum torque output by the driving motor 121 greater than or equal to the first preset torque value, so that the driving motor 121 can output the required torque under the driving of the alternating current output by the three bridge arms.

[0091] Gear 2: When the torque output by the driving motor 121 is greater than the first preset torque value and less than or equal to a second preset torque value, the control device 1223 controls four of the six bridge arms to work and controls the remaining two bridge arms to be turned off. It can be understood that the alternating current output by the four bridge arms can make the maximum torque output by the driving motor 121 greater than or equal to the second preset torque value, so that the driving motor 121 can output the required torque under the driving of the alternating current output by the four bridge arms.

[0092] Gear 3: When the torque output by the driving motor 121 is greater than the second preset torque value and less than or equal to a third preset torque value, the control device 1223 controls five of the six bridge arms to work and controls the remaining one bridge arm to be turned off. It can be understood that the alternating current output by the five bridge arms can make the maximum torque output by the driving motor 121 greater than or equal to the third preset torque value, so that the driving motor 121 can output the required torque under the driving of the alternating current output by the five bridge arms.

[0093] Gear 4: when the torque output by the driving motor 121 is greater than the third preset torque value, the control device 1223 controls the six bridge arms to work so that the driving motor outputs the required torque.

[0094] It can be understood that the embodiments of the present application do not limit the specific values of the first preset torque value, the second preset torque value and the third preset torque value. For example, the above-mentioned preset torque values can be determined in the calibration process or input by the user during use, and the embodiments of the present application do not limit this.

[0095] Based on the above scheme, the control device 1223 can adjust the control strategy of the inverter circuit 1221 according to the torque required to be output by the driving motor 121, so as to reduce the energy consumption of the motor controller 121 and improve the efficiency while meeting the torque demand.

[0096] It can be understood that the control device 1223 can also adjust the control strategy of the inverter circuit 1221 according to the effective value of the current in the winding and / or the output power of the driving motor 121 and other parameters, so as to reduce the energy consumption of the motor controller 121 and improve the efficiency while meeting the performance demand. For specific implementation manners, reference can be made to the above description, and details are not described herein.

[0097] It can be understood that the embodiments of the present application do not limit the specific manner in which the control device 1223 controls the shutdown of part of the bridge arms.

[0098] In some possible embodiments, when the control device 1223 can control the shutdown of the switch tubes in part of the specific bridge arms, the control complexity is low. For example but not limitation, when the torque output by the driving motor 121 is less than or equal to the first preset torque value, the control device 1223 can control the switch tubes Q1 to Q6 in the bridge arms 1 to 3 to be continuously turned off, and control the switch tubes Q7 to Q12 in the bridge arms 4 to 6 to output alternating current to the driving motor 121.

[0099] In some possible embodiments, when the control device 1223 can control the switch tubes in the six bridge arms to be turned off alternately, the heat generation of the power devices is reduced, and the service life of the power devices is prolonged. For example but not limitation, when the torque output by the driving motor 121 is greater than the second preset torque value and less than or equal to the third preset torque value, the control device 1223 can first control the bridge arms 1 to 5 to work and control the bridge arm 6 to be turned off; after t1 time, the control device 1223 controls the bridge arms 2 to 6 to work and controls the bridge arm 1 to be turned off; after t2 time, the control device 1223 controls the bridge arms 1, 3 to 6 to work and controls the bridge arm 2 to be turned off; and after t6 time, the control device 1223 controls the bridge arms 1 to 5 to work and controls the bridge arm 6 to be turned off.

[0100] In some possible embodiments, while the control device 1223 can adjust the control strategy of the inverter circuit 1221 according to the torque required to be output by the driving motor 121, the disconnect device 1223 can disconnect the connection between the bridge arm midpoint of the bridge arm required to be turned off and the corresponding motor winding, improving the safety of the motor controller. As an example but not limitation, when the control device 1223 controls the bridge arm 1 to the bridge arm 5 to work and controls the bridge arm 6 to be turned off, the disconnect device 1223 disconnects the connection between the midpoint of the bridge arm 6 and the motor winding N6.

[0101] It can be understood that, in the process of controlling the working of the partial bridge arms in the inverter circuit 1221 by the control device 1223, if one or more motor windings corresponding to the working bridge arms fail, the control device 1223 can control the bridge arm corresponding to the failed winding to stop working and control the turned-off bridge arm to start working, which is strong in reliability. As an example but not limitation, in the process of controlling the bridge arm 1 to the bridge arm 5 to work and controlling the bridge arm 6 to be turned off by the control device 1223, if the motor winding N1 fails, the control device 1223 controls the switch tube Q1 and the switch tube Q2 in the bridge arm 1 to be turned off, and controls the switch tube Q11 and the switch tube Q12 in the bridge arm 6 to be switched from turning off to starting to work, so that the bridge arm 2 to the bridge arm 6 outputs alternating current to the driving motor 121, maintaining the torque output by the driving motor 121.

[0102] It can be understood that, in the process of controlling the working of the partial bridge arms in the inverter circuit 1221 by the control device 1223, if one or more bridge arms among the working bridge arms fail, the control device 1223 can control the bridge arm in which the failure occurs to stop working and control the turned-off bridge arm to start working, which is strong in reliability. As an example but not limitation, in the process of controlling the bridge arm 1 to the bridge arm 5 to work and controlling the bridge arm 6 to be turned off by the control device 1223, if the bridge arm 1 fails, the control device 1223 controls the switch tube Q1 and the switch tube Q2 in the bridge arm 1 to be turned off, and controls the switch tube Q11 and the switch tube Q12 in the bridge arm 6 to be switched from turning off to starting to work, so that the bridge arm 2 to the bridge arm 6 outputs alternating current to the driving motor 121, maintaining the torque output by the driving motor 121.

[0103] Figure 3 is another schematic diagram of the power assembly 120 provided by an embodiment of the present application.

[0104] As Figure 3As shown, the power assembly 120 comprises a drive motor 121 and a motor controller 122. The motor controller 122 comprises an inverter circuit 1221 and a disconnection device 1222. The inverter circuit 1221 comprises six bridge arms, and the drive motor 121 comprises three-phase windings. The six bridge arms are divided into three groups, and the midpoints of two bridge arms in each group are connected to one phase winding of the drive motor 121 through the disconnection device 1222.

[0105] In some possible embodiments, referring to Figure 3 the inverter circuit comprises bridge arm 1 to bridge arm 6, wherein the midpoints of bridge arm 1 and bridge arm 2 are connected to couple winding N1 of the drive motor 121, the midpoints of bridge arm 3 and bridge arm 4 are connected to couple winding N2 of the drive motor 121, and the midpoints of bridge arm 5 and bridge arm 6 are connected to couple winding N3 of the drive motor 121.

[0106] It can be understood that the present application does not limit the specific connection mode of the midpoints of the two bridge arms in each group of bridge arms. For example, the midpoints of the two bridge arms in each group of bridge arms can be connected to each other through a copper bar.

[0107] In some possible embodiments, the motor controller 122 further comprises a control device 1223, which can be connected to the control electrode of each switch tube in the inverter circuit 1221 to control the conduction and turn-off of each switch tube, so that the inverter circuit 1221 outputs the required alternating current to the motor windings of the drive motor 121.

[0108] In some possible embodiments, the inverter circuit 1221 further comprises a capacitor C1 connected in parallel across the six bridge arms. It can be understood that the capacitor C1 can receive the voltage of the power battery 110 as a bus capacitor and transmit it to the inverter circuit 1221.

[0109] It can be understood that the motor controller 121 further comprises a housing for accommodating the inverter circuit 1221 and the disconnection device 1222. The housing comprises a direct-current input port 122a and an alternating-current output port 122b. For specific descriptions of the direct-current input port 122a and the alternating-current output port 122b, please refer to the related content of Figure 2 , which will not be repeated here.

[0110] In Figure 3 the power assembly 120 shown, the disconnection device 1222 is used to turn on or turn off the connection between the three groups of bridge arms and the drive motor 121, in other words, the disconnection device 1222 can independently control the conduction and turn-off between each group of bridge arms and the motor windings of the drive motor 121 connected thereto. For specific forms of the disconnection device 1222, please refer to the related content of Figure 2 , which will not be repeated here.

[0111] It can be understood that the embodiment of the present application does not limit the assembly position of the disconnection device 1222, and the specific description can be referred to the related content of the Figure 2 and will not be repeated here.

[0112] In some possible embodiments, the disconnection device 1222 can be connected after the connection point of the bridge arm midpoints of the two bridge arms of each group of bridge arms, that is, the disconnection device 1222 will simultaneously disconnect the connection between the bridge arm midpoints of the two bridge arms of the group of bridge arms and the motor winding, and the control complexity is low.

[0113] In another possible embodiment, the disconnection device 1222 can be connected before the connection point of the bridge arm midpoints of the two bridge arms of each group of bridge arms, that is, the disconnection device 1222 can individually disconnect the connection between the midpoint of each bridge arm in the inverter circuit 1221 and the motor winding, and the control flexibility is high.

[0114] In the embodiment of the present application, when one or more windings of the driving motor 121 fail, the disconnection device 1222 can disconnect the connection between the motor winding that fails and the bridge arm midpoint in the motor controller 122 connected thereto. It can be understood that the specific implementation can be referred to the related content of the Figure 2 and will not be repeated here.

[0115] Further, in response to the disconnection device 1222 disconnecting the connection between the motor winding that fails and the bridge arm midpoint in the motor controller 122 connected thereto, the control device 1223 controls the switch tube in the bridge arm connected with the motor winding that fails to be continuously disconnected, and controls the remaining bridge arm to continue to output alternating current.

[0116] In some possible embodiments, when one or more bridge arms in the inverter circuit 1221 fail, the disconnection device 1222 can disconnect the connection between the midpoint of the bridge arm that fails and the motor winding of the driving motor 121 connected thereto. Specifically, when the current through any bridge arm of the six bridge arms is greater than a first current threshold, the disconnection device 1222 can disconnect the connection between the midpoint of the bridge arm and the motor winding connected thereto.

[0117] It can be understood that when the disconnection device 1222 is connected after the connection point of the bridge arm midpoints of the two bridge arms in each group of bridge arms, the disconnection device 1222 can disconnect the connection between the group of bridge arms to which the bridge arm that fails belongs and the motor winding. For example, when the bridge arm 1 fails, the disconnection device 1222 can disconnect the connection between the midpoints of the bridge arm 1 and the bridge arm 2 and the motor winding N1.

[0118] It can be understood that when the disconnection device 1222 is connected before the connection point of the bridge arm midpoint of the two bridge arms in each group of bridge arms, the disconnection device 1222 can separately disconnect the connection between the faulty bridge arm midpoint and the motor winding. For example, when the bridge arm 1 fails, the disconnection device 1222 can disconnect the connection between the midpoint of the bridge arm 1 and the motor winding N1.

[0119] In some possible embodiments, during the operation of the power assembly 120, the control device 1223 can also adjust the control strategy of the inverter circuit 1221 according to the torque required to be output by the driving motor 121, so as to reduce the energy consumption of the motor controller 121 and improve the efficiency while meeting the torque requirement. The specific control manner of the control device 1223 to the inverter circuit 1221 can refer to the related content of Figure 2 , which is not described herein again.

[0120] It should be noted that the control device 1223 can control one bridge arm in each group of bridge arms to work alone or control two bridge arms in each group of bridge arms to work simultaneously, so as to reduce the energy consumption of the motor controller 121 and improve the efficiency while meeting the torque requirement.

[0121] It can be understood that during the process in which the control device 1223 controls part of the bridge arms in the inverter circuit 1221 to work, if one or more motor windings corresponding to the working bridge arms fail, the control device 1223 can control the bridge arm corresponding to the faulty winding to stop working and control the turned-off bridge arm to start working, which is high in reliability.

[0122] It can be understood that during the process in which the control device 1223 controls part of the bridge arms in the inverter circuit 1221 to work, if one or more bridge arms in the working bridge arms fail, the control device 1223 can control the bridge arm in which failure occurs to stop working and control the turned-off bridge arm to start working, which is high in reliability.

[0123] In some possible embodiments, when the disconnection device 1222 is a switch tube, a relay or other cyclically controllable electrical element, the control device 1223 can also disconnect the connection between the bridge arm midpoint of the bridge arm required to be turned off and the corresponding motor winding while adjusting the control strategy of the inverter circuit 1221 according to the torque required to be output by the driving motor 121, thereby improving the safety of the motor controller.

[0124] Figure 4 is a schematic diagram of a distributed power assembly 130 provided by an embodiment of the present application.

[0125] As Figure 4As shown, the distributed power assembly 130 includes a first drive motor 131, a second drive motor 132, and a motor controller 133. The first drive motor 131 and the second drive motor 132 are both three-phase motors, and the motor controller 133 includes an inverter circuit 1331 and a disconnection device 1332. The inverter circuit 1331 includes six bridge arms, and the midpoints of three of the six bridge arms (hereinafter referred to as first three-phase bridge arms) are connected to the three-phase windings of the first drive motor 131, and the midpoints of the other three bridge arms (hereinafter referred to as second three-phase bridge arms) are connected to the three-phase windings of the second drive motor 132.

[0126] In some possible embodiments, with reference to Figure 4 The inverter circuit 1331 includes bridge arms 1 to 6. The bridge arm 1 includes a switch tube Q1 and a switch tube Q2, and the midpoint of the bridge arm 1 is coupled to the winding N1 of the first drive motor 131. The bridge arm 2 includes a switch tube Q3 and a switch tube Q4, and the midpoint of the bridge arm 2 is coupled to the winding N2 of the first drive motor 131. The bridge arm 3 includes a switch tube Q5 and a switch tube Q6, and the midpoint of the bridge arm 3 is coupled to the winding N3 of the first drive motor 131. The bridge arm 4 includes a switch tube Q7 and a switch tube Q8, and the midpoint of the bridge arm 4 is coupled to the winding N4 of the second drive motor 132. The bridge arm 5 includes a switch tube Q9 and a switch tube Q10, and the midpoint of the bridge arm 5 is coupled to the winding N5 of the second drive motor 132. The bridge arm 6 includes a switch tube Q11 and a switch tube Q12, and the midpoint of the bridge arm 6 is coupled to the winding N6 of the second drive motor 132.

[0127] In some possible embodiments, the motor controller 133 further includes a control device 1333, which can be connected to the control electrodes of the respective switch tubes in the inverter circuit 1331 to control the turn-on and turn-off of the respective switch tubes, so that the inverter circuit 1331 outputs the required alternating current to the motor windings of the drive motor 121. It can be understood that the control device 1333 described above can use a set of control resources to control all the switch tubes in the inverter circuit 1331, wherein the control resources include a master control chip, a resolver detection sensor, a current sensor, a sampling circuit, a driving circuit, a communication circuit, a high-voltage and low-voltage power supply, etc., which is conducive to reducing the cost of the motor controller 133.

[0128] It can be understood that the control device 1333 can control the switch tubes in the first three-phase bridge arm to act individually, so that the first driving motor 131 outputs torque individually. Or the control device 1333 can control the switch tubes in the three bridge arms in the second three-phase bridge arm to act individually, so that the second driving motor 132 outputs torque individually. Or the control device 1333 can control the switch tubes in the six bridge arms to act simultaneously, so that the first driving motor 131 and the second driving motor 132 both output torque. Wherein, when the control device 1333 controls the switch tubes in the six bridge arms to act simultaneously, the frequencies of turning on and turning off the switch tubes in the six bridge arms need to be kept the same.

[0129] In some possible embodiments, the inverter circuit 1331 further includes a capacitor C1 connected in parallel across the six bridge arms. It can be understood that the capacitor C1 can receive the voltage of the power battery 110 as a bus capacitor and transmit it to the inverter circuit 1331.

[0130] It can be understood that the motor controller 133 further includes a housing for accommodating the inverter circuit 1331 and the disconnection device 1332, the housing including a direct current input port 133a and an alternating current output port 133b. Wherein, the direct current input port is used to connect the power battery 110, and the input end of the inverter circuit 1331 (i.e. the two ends of the six bridge arms) is connected with the direct current input port 133a. The alternating current output port 133b includes a first alternating current output port 133b1 and a second alternating current output port 133b2, the midpoints of the three bridge arms in the first three-phase bridge arm are connected with the three-phase windings of the first driving motor 131 through the disconnection device 1332 and the first alternating current output 133b1, so as to output the first three-phase alternating current to the first driving motor 131. The midpoints of the three bridge arms in the second three-phase bridge arm are connected with the three-phase windings of the second driving motor 132 through the disconnection device 1332 and the second alternating current output port 133b2, so as to output the second three-phase alternating current to the second driving motor 132.

[0131] It can be understood that the positions of the direct current input port 133a and the alternating current output port 133b on the surface of the housing of the motor controller 133 can be flexibly set according to specific implementation, which is not limited in the embodiments of the present application. And the positions of the first alternating current output port 133b1 and the second alternating current output port 133b2 on the surface of the housing of the motor controller 133 can also be flexibly set according to specific implementation, which is not limited in the embodiments of the present application. For example, the first alternating current output port 133b1 and the second alternating current output port 133b2 can be located on one side c of the housing, or the first alternating current output port 133b1 is located on the side c and the second alternating current output port 133b2 is located on the side adjacent to the side c

[0132] It can be understood that the embodiment of the present application does not limit the assembly position of the disconnection device 1332, and the specific description can be referred to the related content of the embodiment of the present application, which will not be repeated here. Figure 2

[0133] In the embodiment of the present application, when one or more phase windings of the first driving motor 131 and / or the second driving motor 132 fail, the disconnection device 1332 can disconnect the connection between the failed motor winding and the midpoint of the bridge arm connected thereto. Further, in response to the disconnection device 1332 disconnecting the connection between the failed motor winding and the midpoint of the bridge arm in the motor controller 133 connected thereto, the control device 1333 controls the switch tube in the bridge arm connected to the failed motor winding to be continuously disconnected, and controls the remaining bridge arm to continue to output alternating current. It can be understood that the specific implementation can be referred to the related content of the embodiment of the present application, which will not be repeated here. Figure 2

[0134] In some possible embodiments, when one or more bridge arms of the first three-phase bridge arm and / or the second three-phase bridge arm fail, the disconnection device 1332 can disconnect the connection between the midpoint of the failed bridge arm and the motor winding connected thereto. It can be understood that the specific implementation can be referred to the related content of the embodiment of the present application, which will not be repeated here. Figure 2

[0135] Figure 5 is a schematic diagram of a hybrid power assembly 140 provided by the embodiment of the present application.

[0136] As shown in Figure 5 , the hybrid power assembly 140 includes a generator 141, a driving motor 142, and a motor controller 143. The motor controller 143 includes an inverter circuit 1431 and a disconnection device 1432, and the inverter circuit 1431 includes six bridge arms. The midpoints of three bridge arms (hereinafter referred to as the third three-phase bridge arm) of the six bridge arms are connected to the three-phase winding of the generator 141 to receive the fourth three-phase alternating current output by the generator 141 and supply power to the power battery 110. The midpoints of the other three bridge arms (hereinafter referred to as the fourth three-phase bridge arm) are connected to the three-phase winding of the driving motor 142 to output the third three-phase alternating current to the driving motor 142.

[0137] In some possible embodiments, referring to Figure 5 ​​​The inverter circuit 1431 includes bridge arm 1 to bridge arm 6. The bridge arm 1 includes switch tube Q1 and switch tube Q2, and the midpoint of the bridge arm 1 is coupled to winding N1 of the generator 141. The bridge arm 2 includes switch tube Q3 and switch tube Q4, and the midpoint of the bridge arm 2 is coupled to winding N2 of the generator 141. The bridge arm 3 includes switch tube Q5 and switch tube Q6, and the midpoint of the bridge arm 3 is coupled to winding N3 of the generator 141. The bridge arm 4 includes switch tube Q7 and switch tube Q8, and the midpoint of the bridge arm 4 is coupled to winding N4 of the driving motor 142. The bridge arm 5 includes switch tube Q9 and switch tube Q10, and the midpoint of the bridge arm 5 is coupled to winding N5 of the driving motor 142. The bridge arm 6 includes switch tube Q11 and switch tube Q12, and the midpoint of the bridge arm 6 is coupled to winding N6 of the driving motor 142.

[0138] In some possible embodiments, the motor controller 143 further includes a control device 1433, which can be connected to the control electrodes of the switch tubes in the inverter circuit 1431 to control the on and off of the switch tubes, so that the inverter circuit 1431 outputs the required alternating current to the motor winding of the driving motor 121. It can be understood that the control device 1433 described above can use a set of control resources to control all the switch tubes in the inverter circuit 1431, wherein the control resources include a master control chip, a resolver detection sensor, a current sensor, a sampling circuit, a driving circuit, a communication circuit, a high and low voltage power supply, etc., which is conducive to reducing the cost of the motor controller 143.

[0139] It can be understood that the control device 1433 can separately control the switch tube action in the third three-phase bridge arm, so that the generator 141 charges the power battery 110 through the third three-phase bridge arm. Or it can separately control the switch tube action in the three bridge arms in the fourth three-phase bridge arm, so that the driving motor 142 separately outputs torque. Or it can simultaneously control the switch tube action in the six bridge arms, so that the generator 141 charges the power battery 110 while the driving motor 142 outputs torque. When the control device 1433 simultaneously controls the switch tube action in the six bridge arms, it needs to keep the same frequency of the on and off of the switch tubes in the six bridge arms.

[0140] In some possible embodiments, the inverter circuit 1431 further includes a capacitor C1 connected in parallel across the six bridge arms. It can be understood that the capacitor C1 can receive the voltage of the power battery 110 as a bus capacitor and transmit it to the inverter circuit 1431.

[0141] It can be understood that the motor controller 143 further includes a shell for accommodating the inverter circuit 1431 and the disconnection device 1432, the shell including a direct current input port 143a and an alternating current output port 143b. The direct current input port is used to connect the power battery 110, and the input end of the inverter circuit 1431 (i.e. the two ends of the six bridge arms) is connected with the direct current input port 143a. The alternating current output port 143b includes a generator interface 143b1 and a driving motor interface 143b2. The midpoints of the three bridge arms in the fourth three-phase bridge arm are connected with the three-phase winding of the generator 141 through the disconnection device 1432 and the generator interface 143b1, so as to receive the fourth three-phase alternating current output by the generator 141. The midpoints of the three bridge arms in the fourth three-phase bridge arm are connected with the three-phase winding of the driving motor 142 through the disconnection device 1432 and the driving motor interface 143b2, so as to output the third three-phase alternating current to the driving motor 142.

[0142] It can be understood that the positions of the direct current input port 143a and the alternating current output port 143b on the surface of the shell of the motor controller 143 can be flexibly set according to specific implementation, which is not limited in the embodiments of the present application. In addition, the positions of the generator interface 143b1 and the driving motor interface 143b2 on the surface of the shell of the motor controller 143 can also be flexibly set according to specific implementation, which is not limited in the embodiments of the present application.

[0143] It can be understood that the assembly position of the disconnection device 1432 is not limited in the embodiments of the present application, and the specific description can be referred to the related content of Figure 2 , which will not be repeated here.

[0144] In the embodiments of the present application, when one or more windings of the generator 141 and / or the driving motor 142 fail, the disconnection device 1432 can disconnect the connection between the failed motor winding and the midpoint of the bridge arm connected therewith. Further, in response to the disconnection device 1432 disconnecting the connection between the failed motor winding and the midpoint of the bridge arm in the motor controller 143 connected therewith, the control device 1433 controls the switch tube in the bridge arm connected with the failed motor winding to be continuously disconnected, and controls the remaining bridge arms to continue outputting alternating current, and the specific implementation can be referred to the related content of Figure 2 , which will not be repeated here.

[0145] It should be noted that when two windings of the generator 141 fail, the disconnection device 1432 is used to disconnect the connection between the remaining one winding of the generator 141 and the remaining one midpoint of the fourth three-phase bridge arm, in addition to disconnecting the connection between the failed two windings and the midpoints of the two bridge arms in the fourth three-phase bridge arm, so as to avoid further damaging the generator 141.

[0146] In some possible embodiments, when one or more bridge arms of the third three-phase bridge arm and / or the fourth three-phase bridge arm fail, the disconnection device 1432 can disconnect the connection between the midpoint of the failed bridge arm and the motor winding connected thereto. For a detailed implementation, reference can be made to the related content of the foregoing embodiment, which will not be repeated here. Figure 2

[0147] The above merely provides a specific implementation of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be encompassed in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.​

Claims

1. An electric motor controller characterized by, The motor controller comprises: a direct current input port for connecting a power battery; an alternating current output port for connecting a motor; an inverter circuit for converting direct current output by the power battery into alternating current to power the motor, the inverter circuit comprising six bridge arms in parallel, two ends of the six bridge arms being used to receive the direct current through the direct current input port, and bridge arm midpoints of the six bridge arms being used to output the alternating current through the alternating current output port; a disconnecting device for turning on or off the connection between the bridge arm midpoint of each of the six bridge arms and the motor; a control device, during the process in which part of the six bridge arms are used to output alternating current for the motor, when one of the part of the bridge arms fails, the disconnecting device is used to turn off the connection between the bridge arm midpoint of the one bridge arm and the motor, and the control device is used to control the remaining bridge arms in the part of the bridge arms to output alternating current for another one of the bridge arms in another part of the six bridge arms.

2. The motor controller of claim 1, wherein, The motor comprises one drive motor, the one drive motor comprises six-phase windings, and the midpoint of each of the bridge arms is used to connect one phase winding of the one drive motor through the disconnecting device.

3. The motor controller of claim 2, wherein, When one or more phase windings of the one drive motor fail; the disconnecting device is used to turn off the connection between the one or more phase windings and the corresponding bridge arm of the one or more phase windings; the control device is used to control the corresponding bridge arm of the one or more phase windings to be turned off and control the remaining bridge arms to continue outputting alternating current.

4. The motor controller of claim 3, wherein, The control device is further used to: when the torque output by the one drive motor is less than or equal to a first preset torque value, control three of the six bridge arms to work and control the other three bridge arms to be turned off; when the torque output by the one drive motor is greater than the first preset torque value and less than or equal to a second preset torque value, control four of the six bridge arms to work and control the other two bridge arms to be turned off; when the torque output by the one drive motor is greater than the second preset torque value and less than or equal to a third preset torque value, control five of the six bridge arms to work and control the other one bridge arm to be turned off; when the torque output by the one drive motor is greater than the third preset torque value, control the six bridge arms to work.

5. The motor controller of claim 4, wherein, The disconnecting device is specifically used to: when the torque output by the one drive motor is less than or equal to a first preset torque value, turn off the connection between the bridge arm midpoints of the other three bridge arms and the one drive motor; when the torque output by the one drive motor is greater than the first preset torque value and less than or equal to a second preset torque value, turn off the connection between the bridge arm midpoints of the other two bridge arms and the one drive motor; when the torque output by the one drive motor is greater than the second preset torque value and less than or equal to a third preset torque value, turn off the connection between the bridge arm midpoint of the one bridge arm and the one drive motor.

6. The motor controller of claim 1, wherein, The motor includes a first drive motor and a second drive motor, both of which are three-phase motors, and the AC output port includes a first AC output port and a second AC output port; The bridge arm midpoints of three of the six bridge arms are used to connect the three-phase windings of the first drive motor, and the bridge arm midpoints of the other three of the six bridge arms are used to connect the three-phase windings of the second drive motor; The three bridge arms are used to output a first three-phase current to the first drive motor through the first AC output port, and the other three bridge arms are used to output a second three-phase current to the second drive motor through the second AC output port.

7. The motor controller of claim 1, wherein, The motor includes a drive motor and a generator, and the AC output port includes a drive motor interface and a generator interface; The bridge arm midpoints of three of the six bridge arms are used to connect the three-phase windings of the drive motor, and the bridge arm midpoints of the other three of the six bridge arms are used to connect the three-phase windings of the generator; The three bridge arms are used to output a third three-phase current to the drive motor through the drive motor interface, and the other three bridge arms are used to receive a fourth three-phase current output by the generator through the generator interface.

8. The motor controller of claim 7, wherein, The motor controller further includes a control device, which is used to: Control the turn-on and turn-off of the bridge arms in the three bridge arms and the other three bridge arms at the same frequency.

9. The motor controller of claim 1, wherein, The motor includes a drive motor, the drive motor includes three-phase windings, and the six bridge arms include three groups of bridge arms, the midpoints of two bridge arms in each group of bridge arms being connected to connect the three-phase windings through the disconnection device and the AC output port.

10. The motor controller of any one of claims 1 to 9, wherein, The disconnection device is further used to: When the current through any one of the six bridge arms is greater than a fourth current threshold, disconnect the connection between the any one bridge arm and the motor.

11. A powertrain, characterized by, The power assembly includes a motor controller and a motor, and the motor controller includes: A DC input port for connecting a power battery; An AC output port for connecting the motor; An inverter circuit for converting DC power output by the power battery into AC power to power the motor, the inverter circuit including six bridge arms connected in parallel, both ends of the six bridge arms being used to receive the DC power through the DC input port, and the bridge arm midpoints of the six bridge arms being used to output the AC power through the AC output port; A disconnection device for turning on or off the connection between the bridge arm midpoints of each of the six bridge arms and the motor; The control device is configured to control the remaining bridge arms in the partial bridge arms and another bridge arm in another partial bridge arm of the six bridge arms to output alternating current for the motor when a corresponding winding of one of the bridge arms in the partial bridge arms fails.

12. The powertrain of claim 11, wherein, The motor includes one drive motor, and each midpoint of the bridge arms is configured to be connected to one phase winding of the one drive motor through the disconnection device. When one or more phase windings of the one drive motor fail; The disconnection device is configured to disconnect the one or more phase windings and the corresponding bridge arms of the one or more phase windings. The control device is configured to control the corresponding bridge arms of the one or more phase windings to be turned off and control the remaining bridge arms to continue outputting alternating current.

13. The powertrain of claim 12, wherein, The control device is further configured to: control three bridge arms of the six bridge arms to work and control the other three bridge arms to be turned off when the torque output by the one drive motor is less than or equal to a first preset torque value; control four bridge arms of the six bridge arms to work and control the other two bridge arms to be turned off when the torque output by the one drive motor is greater than the first preset torque value and less than or equal to a second preset torque value; control five bridge arms of the six bridge arms to work and control the other one bridge arm to be turned off when the torque output by the one drive motor is greater than the second preset torque value and less than or equal to a third preset torque value; and control the six bridge arms to work when the torque output by the one drive motor is greater than the third preset torque value.

14. The powertrain of claim 13, wherein, The disconnection device is specifically configured to: disconnect the midpoints of the other three bridge arms and the one drive motor when the torque output by the one drive motor is less than or equal to a first preset torque value; disconnect the midpoints of the other two bridge arms and the one drive motor when the torque output by the one drive motor is greater than the first preset torque value and less than or equal to a second preset torque value; disconnect the midpoint of the one bridge arm and the one drive motor when the torque output by the one drive motor is greater than the second preset torque value and less than or equal to a third preset torque value.

15. The powertrain of claim 11, wherein, The power assembly is a distributed power assembly, the motor includes a first drive motor and a second drive motor, the first drive motor and the second drive motor are three-phase motors, and the alternating current output port includes a first alternating current output port and a second alternating current output port. The midpoints of three bridge arms of the six bridge arms are configured to be connected to three-phase windings of the first drive motor, and the midpoints of the other three bridge arms of the six bridge arms are configured to be connected to three-phase windings of the second drive motor. The three bridge arms are configured to output first three-phase current to the first drive motor through the first alternating current output port, and the other three bridge arms are configured to output second three-phase current to the second drive motor through the second alternating current output port.

16. The powertrain of claim 11, wherein, The power assembly is a hybrid power assembly, the motor includes a driving motor and a generator, and the alternating current output port includes a driving motor interface and a generator interface; Bridge arm midpoints of three bridge arms of the six bridge arms are used for connecting three-phase windings of the driving motor, and bridge arm midpoints of the other three bridge arms of the six bridge arms are used for connecting three-phase windings of the generator; The three bridge arms are used for outputting third three-phase currents to the driving motor through the driving motor interface, and the other three bridge arms are used for receiving fourth three-phase currents output by the generator through the generator interface.

17. The powertrain of any one of claims 11-16, wherein, The disconnecting device is further used for: When a current through any one of the six bridge arms is greater than a fourth current threshold, disconnecting the connection between the any one bridge arm and the motor.

18. An electric vehicle characterized by comprising: The electric vehicle includes a power battery, a power assembly, and wheels, the power assembly is used for receiving power supply of the power battery to drive rotation of the wheels, the power assembly includes a motor controller and a motor, and the motor controller includes: A direct current input port used for connecting a power battery; An alternating current output port used for connecting the motor; An inverter circuit used for converting direct current output by the power battery into alternating current to supply power to the motor, the inverter circuit includes six bridge arms in parallel, two ends of the six bridge arms are used for receiving the direct current through the direct current input port, and bridge arm midpoints of the six bridge arms are used for outputting the alternating current through the alternating current output port; A disconnecting device used for conducting or disconnecting the connection between the bridge arm midpoint of each of the six bridge arms and the motor; A control device, during a process in which part of the six bridge arms are used for outputting alternating current to the motor, when a corresponding winding of one of the part of the bridge arms fails, the disconnecting device is further used for disconnecting the connection between the bridge arm midpoint of the one bridge arm and the motor, and the control device is used for controlling the remaining bridge arms of the part of the bridge arms and another one of the part of the six bridge arms to output alternating current to the motor.

19. The electric vehicle of claim 18, wherein, The power assembly is a distributed power assembly, the motor includes a first driving motor and a second driving motor, the first driving motor and the second driving motor are both three-phase motors, and the alternating current output port includes a first alternating current output port and a second alternating current output port; Bridge arm midpoints of three bridge arms of the six bridge arms are used for connecting three-phase windings of the first driving motor, and bridge arm midpoints of the other three bridge arms of the six bridge arms are used for connecting three-phase windings of the second driving motor; The three bridge arms are used for outputting first three-phase currents to the first driving motor through the first alternating current output port, and the other three bridge arms are used for outputting second three-phase currents to the second driving motor through the second alternating current output port.

20. The electric vehicle of claim 19, wherein, The power assembly is a hybrid power assembly, the motor includes a driving motor and a generator, and the alternating current output port includes a driving motor interface and a generator interface; bridge midpoints of three of the six bridge arms are used to connect three-phase windings of the one drive motor, and bridge midpoints of the other three of the six bridge arms are used to connect three-phase windings of the generator; the three bridge arms are used to output a third three-phase current to the one drive motor through the drive motor interface, and the other three bridge arms are used to receive a fourth three-phase current output by the one generator through the generator interface.

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