Motor control system and electric vehicle

Abstract

The utility model discloses a motor control system and an electric vehicle. The motor control system comprises a power supply, a first-phase full-bridge driving module, a second-phase full-bridge driving module and a third-phase full-bridge driving module. A first input end of the first-phase full-bridge driving module is connected with a first end of a power supply, a second input end of the first-phase full-bridge driving module is connected with a second end of the power supply, a first output end of the first-phase full-bridge driving module is connected with one end of a first phase of the motor, and a second output end of the first-phase full-bridge driving module is connected with the other end of the first phase of the motor; the control end of the first-phase full-bridge driving module is used for receiving a first-phase control signal; the first output end of the second-phase full-bridge driving module is connected with one end of the second phase of the motor; the first output end of the third-phase full-bridge driving module is connected with one end of the third phase of the motor. According to the utility model, the problem that the rotating speed and torque of the motor cannot be considered in the prior art can be solved, the rotating speed of the motor can be improved, and the maximum output torque of the motor is not reduced.

Description

Technical Field

[0001] The embodiments of the utility model relate to the technical field of motor control, and in particular to a motor control system and an electric vehicle. Background Art

[0002] At present, electric vehicles are usually driven by brushless DC motors.

[0003] When other conditions remain unchanged, the output speed and torque of the existing brushless DC motor can be changed by changing the number of turns of the motor stator winding. For example, when the maximum input current and voltage remain unchanged, only increasing the number of turns of the motor stator can increase the maximum torque, but will reduce the maximum speed; only reducing the number of turns of the motor stator can increase the maximum speed but will reduce the maximum torque. Therefore, the speed and torque of the existing brushless DC motor cannot be taken into account at the same time, and it is impossible to make the electric vehicle run faster and climb more powerfully. Utility Model Content

[0004] The utility model provides a motor control system and an electric vehicle, which can improve the rotation speed of the motor without reducing the maximum output torque of the motor, so that the electric vehicle can run faster and climb more powerfully.

[0005] In a first aspect, an embodiment of the utility model provides a motor control system, including a power supply, a first-phase full-bridge drive module, a second-phase full-bridge drive module, and a third-phase full-bridge drive module;

[0006] The first input end of the first-phase full-bridge drive module is connected to the first end of the power supply, the second input end of the first-phase full-bridge drive module is connected to the second end of the power supply, the first output end of the first-phase full-bridge drive module is connected to one end of the first phase of the motor, and the second output end of the first-phase full-bridge drive module is connected to the other end of the first phase of the motor; the control end of the first-phase full-bridge drive module is used to receive a first-phase control signal;

[0007] The first input end of the second-phase full-bridge drive module is connected to the first end of the power supply, the second input end of the second-phase full-bridge drive module is connected to the second end of the power supply, the first output end of the second-phase full-bridge drive module is connected to one end of the second phase of the motor, and the second output end of the second-phase full-bridge drive module is connected to the other end of the second phase of the motor; the control end of the second-phase full-bridge drive module is used to receive a second-phase control signal;

[0008] The first input end of the third-phase full-bridge drive module is connected to the first end of the power supply, the second input end of the third-phase full-bridge drive module is connected to the second end of the power supply, the first output end of the third-phase full-bridge drive module is connected to one end of the third phase of the motor, and the second output end of the third-phase full-bridge drive module is connected to the other end of the third phase of the motor; the control end of the third-phase full-bridge drive module is used to receive a third-phase control signal.

[0009] Further, the first-phase full-bridge drive module includes a first upper bridge arm, a first lower bridge arm, a second upper bridge arm, and a second lower bridge arm; the first upper bridge arm and the first lower bridge arm are connected in series between the first end and the second end of the power supply; the common connection end of the first upper bridge arm and the first lower bridge arm is connected to one end of the first phase of the motor; the second upper bridge arm and the second lower bridge arm are connected in series between the first end and the second end of the power supply, and the common connection end of the second upper bridge arm and the second lower bridge arm is connected to the other end of the first phase of the motor;

[0010] The second-phase full-bridge drive module includes a third upper bridge arm, a third lower bridge arm, a fourth upper bridge arm and a fourth lower bridge arm; the third upper bridge arm and the third lower bridge arm are connected in series between the first end and the second end of the power supply; the common connection end of the third upper bridge arm and the third lower bridge arm is connected to one end of the second phase of the motor; the fourth upper bridge arm and the fourth lower bridge arm are connected in series between the first end and the second end of the power supply, and the common connection end of the fourth upper bridge arm and the fourth lower bridge arm is connected to the other end of the second phase of the motor;

[0011] The third-phase full-bridge drive module includes a fifth upper bridge arm, a fifth lower bridge arm, a sixth upper bridge arm and a sixth lower bridge arm; the fifth upper bridge arm and the fifth lower bridge arm are connected in series between the first end and the second end of the power supply; the common connection end of the fifth upper bridge arm and the fifth lower bridge arm is connected to one end of the third phase of the motor; the sixth upper bridge arm and the sixth lower bridge arm are connected in series between the first end and the second end of the power supply, and the common connection end of the sixth upper bridge arm and the sixth lower bridge arm is connected to the other end of the third phase of the motor.

[0012] Further, the first upper bridge arm includes a first switch tube, the second upper bridge arm includes a seventh switch tube, the first lower bridge arm includes a fourth switch tube, and the second lower bridge arm includes a tenth switch tube;

[0013] The drain of the first switch tube and the drain of the seventh switch tube are both connected to the positive electrode of the power supply, the source of the first switch tube is connected to one end of the first phase of the motor and the drain of the fourth switch tube, the source of the seventh switch tube is connected to the other end of the first phase of the motor and the drain of the tenth switch tube; the source of the fourth switch tube and the source of the tenth switch tube are both connected to the negative electrode of the power supply;

[0014] The gate of the first switch tube and the gate of the tenth switch tube both receive the first phase control signal; the gate of the fourth switch tube and the gate of the seventh switch tube both receive an inverse signal of the first phase control signal.

[0015] Furthermore, the first-phase full-bridge driving module further includes a first inverter and a second inverter;

[0016] The input end of the first inverter receives the first phase control signal, and the output end of the first inverter is connected to the gate of the fourth switch tube;

[0017] An input end of the second inverter receives the first phase control signal, and an output end of the second inverter is connected to a gate of the seventh switch tube.

[0018] Further, the third upper bridge arm includes a second switch tube, the fourth upper bridge arm includes an eighth switch tube, the third lower bridge arm includes a fifth switch tube, and the fourth lower bridge arm includes an eleventh switch tube;

[0019] The drain of the second switch tube and the drain of the eighth switch tube are both connected to the positive electrode of the power supply, the source of the second switch tube is connected to one end of the second phase of the motor and the drain of the fifth switch tube, the source of the eighth switch tube is connected to the other end of the second phase of the motor and the drain of the eleventh switch tube; the source of the fifth switch tube and the source of the eleventh switch tube are both connected to the negative electrode of the power supply;

[0020] The gate of the second switch tube and the gate of the eleventh switch tube both receive the second phase control signal; the gate of the eighth switch tube and the gate of the fifth switch tube both receive the inverse signal of the second phase control signal.

[0021] Furthermore, the second-phase full-bridge driving module further includes a third inverter and a fourth inverter;

[0022] The input end of the third inverter receives the second phase control signal, and the output end of the third inverter is connected to the gate of the fifth switch tube;

[0023] An input end of the fourth inverter receives the second phase control signal, and an output end of the fourth inverter is connected to the gate of the eighth switch tube.

[0024] Further, the fifth upper bridge arm includes a third switch tube, the sixth upper bridge arm includes a ninth switch tube, the fifth lower bridge arm includes a sixth switch tube, and the sixth lower bridge arm includes a twelfth switch tube;

[0025] The drain of the third switch tube and the drain of the ninth switch tube are both connected to the positive electrode of the power supply, the source of the third switch tube is connected to one end of the third phase of the motor and the drain of the sixth switch tube, the source of the ninth switch tube is connected to the other end of the third phase of the motor and the drain of the twelfth switch tube; the source of the sixth switch tube and the source of the twelfth switch tube are both connected to the negative electrode of the power supply;

[0026] The gate of the third switch tube and the gate of the twelfth switch tube both receive the third phase control signal; the gate of the ninth switch tube and the gate of the sixth switch tube both receive the inverse signal of the third phase control signal.

[0027] Furthermore, the third-phase full-bridge driving module further includes a fifth inverter and a sixth inverter;

[0028] The input end of the fifth inverter is connected to the third phase control end of the control module, and the output end of the fifth inverter is connected to the gate of the sixth switch tube;

[0029] The input end of the sixth inverter is connected to the third phase control end of the control module, and the output end of the sixth inverter is connected to the gate of the ninth switch tube.

[0030] Furthermore, the switch tubes in the first-phase full-bridge drive module, the second-phase full-bridge drive module and the third-phase full-bridge drive module are all field effect transistors, insulated gate bipolar transistors, turn-off thyristors or power transistors.

[0031] In a second aspect, an embodiment of the utility model further provides an electric vehicle, which includes any motor control system in the embodiments of the utility model.

[0032] The utility model provides a motor control system and an electric vehicle, wherein the first phase of the motor is connected to the first phase of the motor through a first-phase full-bridge drive module, the second phase full-bridge drive module is connected to the second phase of the motor, and the third phase full-bridge drive module is connected to the third phase of the motor, and the first phase full-bridge drive module is controlled by a first-phase control signal, the second phase full-bridge drive module is controlled by a second-phase control signal, and the third phase full-bridge drive module is controlled by a third-phase control signal, so that the voltages of the first phase, the second phase, and the third phase of the motor are controlled by the corresponding full-bridge drive of each phase. Compared with the half-bridge drive mode in the prior art, under the same input voltage and current, the speed of the motor can be increased without reducing the number of turns of the motor stator and the maximum output torque of the motor. The utility model can solve the problem that the motor speed and torque cannot be taken into account in the prior art, and can realize the improvement of the motor speed without reducing the maximum output torque of the motor, so that the electric vehicle can run fast and climb more powerfully. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a circuit diagram of a motor control system in the prior art.

[0034] Figure 2 A circuit diagram of a motor control system provided by an embodiment of the utility model.

[0035] Figure 3 A circuit diagram of another motor control system provided by an embodiment of the utility model.

[0036] Figure 4 A circuit conduction diagram of a motor control system provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0037] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0038] The motor control system in the prior art usually drives the motor by a three-phase half-bridge drive. Figure 1 FIG. 1 is a circuit diagram of a motor control system in the prior art, such as Figure 1 As shown, the switch tubes V13, V14, V15, V19, V20, and V21 form a three-phase half-bridge drive, where V13, V14, and V15 are the upper bridge arms of the three phases, and V19, V20, and V21 are the lower bridge arms of the three phases. The upper and lower bridge arms of the same phase are complementary drives. Figure 1When the A phase upper bridge and B phase lower bridge of the motor are turned on, the internal resistance of the switch tube, wire, and battery is ignored. Assuming that the parameters of each phase winding of the motor are the same, the current flows from the positive pole of the power supply → switch tube V13 → A phase winding → B phase winding → switch tube V20 → negative pole of the power supply. Assume that the battery voltage is U dc The phase voltage of phases A and B loaded on the motor is U a , U b , then U a =U b =0.5U dc , that is, the voltage across each phase of the motor is 0.5 times the power supply voltage. The motor speed is directly related to the loaded phase voltage. If the ratio coefficient of the loaded motor phase voltage per volt to the speed is k, then the motor speed n = k*U a = k * U b =k*0.5*U dc The motor control system in the prior art can only increase the maximum speed of the motor by reducing the number of turns of the motor stator winding when the maximum input current and voltage remain unchanged, but it will reduce the maximum torque and cannot take into account both the speed and torque of the motor.

[0039] In order to solve the problems in the prior art, the present invention provides a motor control system. Figure 2 A circuit diagram of a motor control system provided by an embodiment of the utility model, such as Figure 2As shown, the motor control system includes a power supply BAT, a first-phase full-bridge drive module 110, a second-phase full-bridge drive module 120 and a third-phase full-bridge drive module 130; the first input end of the first-phase full-bridge drive module 110 is connected to the first end of the power supply BAT, the second input end of the first-phase full-bridge drive module 110 is connected to the second end of the power supply BAT, the first output end of the first-phase full-bridge drive module 110 is connected to one end of the first phase A of the motor, and the second output end of the first-phase full-bridge drive module 110 is connected to the other end of the first phase A of the motor; the control end of the first-phase full-bridge drive module 110 is used to receive a first-phase control signal PWM A; the first input end of the second-phase full-bridge drive module 120 is connected to the first end of the power supply BAT, the second input end of the second-phase full-bridge drive module 120 is connected to the second end of the power supply BAT, the first output end of the second-phase full-bridge drive module 120 is connected to one end of the second phase B of the motor, and the second output end of the second-phase full-bridge drive module 120 is connected to the other end of the second phase B of the motor; the control end of the second-phase full-bridge drive module 120 is used to receive the second-phase control signal PWM B; the first input end of the third-phase full-bridge drive module 130 is connected to the first end of the power supply BAT, the second input end of the third-phase full-bridge drive module 130 is connected to the second end of the power supply BAT, the first output end of the third-phase full-bridge drive module 130 is connected to one end of the third phase C of the motor, and the second output end of the third-phase full-bridge drive module 130 is connected to the other end of the third phase C of the motor; the control end of the third-phase full-bridge drive module 130 is used to receive the third phase control signal PWM C.

[0040] Specifically, the control end of the first-phase full-bridge drive module 110 receives the first-phase control signal PWM A, and the first-phase control signal PWM A controls the internal conduction of the first-phase full-bridge drive module 110. Since the first output end of the first-phase full-bridge drive module 110 is connected to one end of the first phase A of the motor, the second output end of the first-phase full-bridge drive module 110 is connected to the other end of the first phase A of the motor, the first input end of the first-phase full-bridge drive module 110 is connected to the first end of the power supply BAT, and the second input end of the first-phase full-bridge drive module 110 is connected to the second end of the power supply BAT, the first phase A of the motor and the two ends of the power supply BAT form a conductive loop. When the internal resistance of the first-phase full-bridge drive module 110, the wire and the power supply BAT are ignored, the voltage of the first phase A of the motor can be equal to the power supply voltage. Similarly, the control end of the second-phase full-bridge drive module 120 receives the second-phase control signal PWM B, and the first-phase control signal PWM B controls the internal conduction of the second-phase full-bridge drive module 120, so that the voltage of the second phase B of the motor is equal to the power supply voltage; the control end of the third-phase full-bridge drive module 130 receives the third-phase control signal PWM C, and the third-phase control signal PWM B controls the internal conduction of the third-phase full-bridge drive module 130, so that the voltage of the third phase C of the motor is equal to the power supply voltage. The speed of the motor is related to the voltage at both ends of each phase of the motor. When the motor winding parameters remain unchanged, the greater the voltage at both ends of each phase of the motor, the faster the speed of the motor. The motor control system in the prior art usually drives the motor in a three-phase half-bridge drive mode. When the motor control system in the prior art is working, ignoring the internal resistance of the switch tube, the wire, and the battery, the voltage at both ends of each phase of the motor is 0.5 times the power supply voltage. Therefore, compared with the prior art, the motor control system of this embodiment can increase the voltage at both ends of each phase of the motor, thereby increasing the motor speed. Furthermore, since the number of turns of the stator winding of the motor is not changed, the speed of the motor can be increased under the same input voltage and current without reducing the maximum output torque.

[0041] The technical solution of this embodiment provides a motor control system, in which the first-phase full-bridge drive module is connected to the first phase of the motor, the second-phase full-bridge drive module is connected to the second phase of the motor, and the third-phase full-bridge drive module is connected to the third phase of the motor. The first-phase full-bridge drive module is controlled by the first-phase control signal, the second-phase full-bridge drive module is controlled by the second-phase control signal, and the third-phase full-bridge drive module is controlled by the third-phase control signal, so that the voltages of the first phase, the second phase and the third phase of the motor are controlled by the corresponding full-bridge drive of each phase. Compared with the half-bridge drive mode in the prior art, under the same input voltage and current, the speed of the motor can be increased without reducing the number of turns of the motor stator and the maximum output torque of the motor. The utility model can solve the problem that the motor speed and torque cannot be taken into account in the prior art, and can realize the increase of the motor speed without reducing the maximum output torque of the motor, so that the electric vehicle can run faster and climb more powerfully.

[0042] Figure 3 A circuit diagram of another motor control system provided by an embodiment of the utility model. In the embodiment of the utility model, as Figure 3 As shown, the first-phase full-bridge drive module 110 includes a first upper bridge arm 111, a first lower bridge arm 112, a second upper bridge arm 113 and a second lower bridge arm 114; the first upper bridge arm 111 and the first lower bridge arm 112 are connected in series between the first end and the second end of the power supply BAT; the common connection end of the first upper bridge arm 111 and the first lower bridge arm 112 is connected to one end of the first phase A of the motor; the second upper bridge arm 113 and the second lower bridge arm 114 are connected in series between the first end and the second end of the power supply BAT, and the common connection end of the second upper bridge arm 113 and the second lower bridge arm 114 is connected to the other end of the first phase A of the motor.

[0043] The second-phase full-bridge drive module 120 includes a third upper bridge arm 121, a third lower bridge arm 122, a fourth upper bridge arm 123 and a fourth lower bridge arm 124; the third upper bridge arm 121 and the third lower bridge arm 122 are connected in series between the first end and the second end of the power supply BAT; the common connection end of the third upper bridge arm 121 and the third lower bridge arm 122 is connected to one end of the second phase B of the motor; the fourth upper bridge arm 123 and the fourth lower bridge arm 124 are connected in series between the first end and the second end of the power supply BAT, and the common connection end of the fourth upper bridge arm 123 and the fourth lower bridge arm 124 is connected to the other end of the second phase of the motor.

[0044] The third-phase full-bridge drive module 130 includes a fifth upper bridge arm 131, a fifth lower bridge arm 132, a sixth upper bridge arm 133 and a sixth lower bridge arm 134; the fifth upper bridge arm 131 and the fifth lower bridge arm 132 are connected in series between the first end and the second end of the power supply BAT; the common connection end of the fifth upper bridge arm 131 and the fifth lower bridge arm 132 is connected to one end of the third phase C of the motor; the sixth upper bridge arm 133 and the sixth lower bridge arm 134 are connected in series between the first end and the second end of the power supply BAT, and the common connection end of the sixth upper bridge arm 133 and the sixth lower bridge arm 134 is connected to the other end of the third phase C of the motor.

[0045] Among them, in the first phase full-bridge drive module 110, the second phase full-bridge drive module 120 and the third phase full-bridge drive module 130, the upper and lower bridge arms in the full-bridge drive modules of the same phase are complementary driven, and the diagonal bridge arms are synchronously driven. Exemplarily, in the first phase full-bridge drive module 110, the first upper bridge arm 111 and the first lower bridge arm 112 are complementary driven, the second upper bridge arm 113 and the second lower bridge arm 114 are complementary driven, the first upper bridge arm 111 and the second lower bridge arm 114 are synchronously driven, and the first lower bridge arm 112 and the second upper bridge arm 113 are synchronously driven. Synchronous drive means that the diagonal bridge arms are turned on at the same time to drive the motor to work. Complementary drive means that only one of the upper and lower bridge arms is turned on at the same time to drive the motor to work. Taking the first-phase full-bridge drive module 110 as an example, at the same time, when the first lower bridge arm 112 and the second upper bridge arm 113 are turned on, the first upper bridge arm 111 and the second lower bridge arm 114 are not turned on, so that the first phase A of the motor and the power supply BAT form a conductive circuit to drive the motor to work.

[0046] Specifically, by synchronously driving the diagonal bridge arms in the first-phase full-bridge drive module 110, the second-phase full-bridge drive module 120, and the third-phase full-bridge drive module 130, each phase of the motor and both ends of the power supply BAT can form a conductive loop, and when the internal resistance of each phase full-bridge drive module, the wire, and the power supply BAT is ignored, the voltage of each phase of the motor can be equal to the power supply voltage. Compared with the prior art, the motor control system of this embodiment can increase the voltage at both ends of each phase of the motor, thereby increasing the motor speed.

[0047] For further information, please refer to Figure 3 The first upper bridge arm 111 includes a first switch tube V1, the second upper bridge arm 113 includes a seventh switch tube V7, the first lower bridge arm 112 includes a fourth switch tube V4, and the second lower bridge arm 114 includes a tenth switch tube V10.

[0048] The drain of the first switch tube V1 and the drain of the seventh switch tube V7 are both connected to the positive electrode of the power supply BAT, the source of the first switch tube V1 is connected to one end of the first phase A of the motor and the drain of the fourth switch tube V4, the source of the seventh switch tube V7 is connected to the other end of the first phase A of the motor and the drain of the tenth switch tube; the source of the fourth switch tube V4 and the source of the tenth switch tube V10 are both connected to the negative electrode of the power supply BAT.

[0049] The gate of the first switch tube V1 and the gate of the tenth switch tube V10 both receive the first phase control signal PWM A. The gate of the fourth switch tube V4 and the gate of the seventh switch tube V7 both receive the inverse signal of the first phase control signal PWM A. The first end of the power supply BAT is the positive pole, and the second end of the power supply BAT is the negative pole.

[0050] When the gate-source voltage of the switch tube is greater than the threshold voltage, the switch tube is turned on. Therefore, the first phase control signal PWM A can control the first switch tube V1 and the tenth switch tube V10 to be turned on, so that the first phase A of the motor and the power supply form a conductive loop.

[0051] Specifically, when the gate of the first switch tube V1 and the gate of the tenth switch tube V10 both receive the first phase control signal PWM A, the first phase A of the motor is turned on, and the voltage of the first phase A of the motor can be equal to the power supply voltage when the internal resistance of the first phase full-bridge drive module 110, the wire and the power supply BAT is ignored. When the gate of the fourth switch tube V4 and the gate of the seventh switch tube V7 both receive the inverse signal of the first phase control signal PWM A, the first phase A of the motor is turned on, and the voltage of the first phase A of the motor can be equal to the power supply voltage when the internal resistance of the first phase full-bridge drive module 110, the wire and the power supply BAT is ignored. Compared with the prior art, the motor control system of this embodiment can increase the voltage across each phase of the motor, thereby increasing the motor speed.

[0052] For further information, please refer to Figure 3 The first-phase full-bridge driving module 110 also includes a first inverter T1 and a second inverter T2; the input end of the first inverter T1 receives the first-phase control signal PWM A, and the output end of the first inverter T1 is connected to the gate of the fourth switch tube V4; the input end of the second inverter T2 receives the first-phase control signal PWM A, and the output end of the second inverter T2 is connected to the gate of the seventh switch tube V7.

[0053] The function of the inverter is to invert the phase of the input signal by 180 degrees, and the first phase control signal PWM A is received through the input end of the first inverter T1. The first inverter T1 can invert the phase of the first phase control signal PWM A by 180 degrees to obtain the inverse signal of the first phase control signal PWM A, and output the inverse signal of the first phase control signal PWM A to the gate of the fourth switch tube V4. Similarly, the second inverter T2 can output the inverse signal of the first phase control signal PWM A to the gate of the seventh switch tube V7.

[0054] Specifically, by setting the first inverter T1 at the gate of the fourth switch tube V4, the second inverter T2 at the gate of the seventh switch tube V7, and sending the first phase control signal PWM A to the gate of the first switch tube V1, the gate of the tenth switch tube V10, the first inverter T1 and the second inverter T2, on the basis that the first phase full-bridge driving module 110 only receives the first phase control signal PWM A, synchronous driving of the fourth switch tube V4 and the seventh switch tube V7, and synchronous driving of the first switch tube V1 and the tenth switch tube V10 are achieved, so that the first upper bridge arm 111 and the first lower bridge arm 112 are complementary driven, the second upper bridge arm 113 and the second lower bridge arm 114 are complementary driven, the first upper bridge arm 111 and the second lower bridge arm 114 are synchronously driven, and the first lower bridge arm 112 and the second upper bridge arm 113 are synchronously driven.

[0055] For further information, please refer to Figure 3 The third upper bridge arm 121 includes a second switch tube V2, the fourth upper bridge arm 123 includes an eighth switch tube V8, the third lower bridge arm 122 includes a fifth switch tube V5, and the fourth lower bridge arm 124 includes an eleventh switch tube V11.

[0056] The drain of the second switch tube V2 and the drain of the eighth switch tube V8 are both connected to the positive electrode of the power supply BAT, the source of the second switch tube V2 is connected to one end of the second phase B of the motor and the drain of the fifth switch tube V5, the source of the eighth switch tube V8 is connected to the other end of the second phase B of the motor and the drain of the eleventh switch tube V11; the source of the fifth switch tube V5 and the source of the eleventh switch tube V11 are both connected to the negative electrode of the power supply BAT.

[0057] The gates of the second switch tube V2 and the eleventh switch tube V11 both receive the second phase control signal PWM B; the gates of the eighth switch tube V8 and the fifth switch tube V5 both receive the inverse signal of the second phase control signal PWM B.

[0058] Specifically, when the gate of the second switch tube V2 and the gate of the eleventh switch tube V11 both receive the second phase control signal PWM B, the second phase B of the motor is turned on, and the voltage of the second phase B of the motor can be equal to the power supply voltage when the internal resistance of the second phase full-bridge drive module 120, the wire and the power supply BAT is ignored. Compared with the prior art, the motor control system of this embodiment can increase the voltage across each phase of the motor, thereby increasing the motor speed.

[0059] For further information, please refer to Figure 3 The second-phase full-bridge driving module 120 also includes a third inverter T3 and a fourth inverter T4; the input end of the third inverter T3 receives the second-phase control signal PWM B, and the output end of the third inverter T3 is connected to the gate of the fifth switch tube V5; the input end of the fourth inverter T4 receives the second-phase control signal PWM B, and the output end of the fourth inverter T4 is connected to the gate of the eighth switch tube V8.

[0060] Specifically, by setting the third inverter T3 at the gate of the fifth switch tube V5, the fourth inverter T4 at the gate of the eighth switch tube V8, and sending the second phase control signal PWM B to the gate of the second switch tube V2, the gate of the eleventh switch tube V11, the third inverter T3 and the fourth inverter T4, on the basis that the second phase full-bridge drive module 120 only receives the second phase control signal PWM B, the upper and lower bridge arms in the second phase full-bridge drive module 120 are complementary driven, and the diagonal bridge arms are synchronously driven.

[0061] For further information, please refer to Figure 3 The fifth upper bridge arm 131 includes a third switch tube V3, the sixth upper bridge arm 133 includes a ninth switch tube V9, the fifth lower bridge arm 132 includes a sixth switch tube V6, and the sixth lower bridge arm 134 includes a twelfth switch tube V12.

[0062] The drain of the third switch tube V3 and the drain of the ninth switch tube V9 are both connected to the positive electrode of the power supply BAT, the source of the third switch tube V3 is connected to one end of the third phase C of the motor and the drain of the sixth switch tube V6, the source of the ninth switch tube V9 is connected to the other end of the third phase C of the motor and the drain of the twelfth switch tube V12; the source of the sixth switch tube V6 and the source of the twelfth switch tube V12 are both connected to the negative electrode of the power supply BAT.

[0063] The gates of the third switch tube V3 and the twelfth switch tube V12 both receive the third phase control signal PWM C; the gates of the ninth switch tube V9 and the sixth switch tube V6 both receive the inverse signal of the third phase control signal PWM C.

[0064] Specifically, when the gate of the third switch tube V3 and the gate of the eleventh switch tube V11 both receive the third phase control signal PWM C, the third phase C of the motor is turned on, and the voltage of the third phase C of the motor can be equal to the power supply voltage when the internal resistance of the third phase full-bridge drive module 130, the wire and the power supply BAT is ignored. When the gate of the ninth switch tube V9 and the gate of the sixth switch tube V6 both receive the inverse signal of the third phase control signal PWM C, the third phase C of the motor is turned on, and the voltage of the third phase C of the motor can also be equal to the power supply voltage when the internal resistance of the third phase full-bridge drive module 130, the wire and the power supply BAT is ignored. Compared with the prior art, the motor control system of this embodiment can increase the voltage across each phase of the motor, thereby increasing the motor speed.

[0065] For further information, please refer to Figure 3 The third-phase full-bridge driving module 130 also includes a fifth inverter T5 and a sixth inverter T6; the input end of the fifth inverter T5 receives the third-phase control signal PWM C, and the output end of the fifth inverter T5 is connected to the gate of the sixth switch tube V6; the input end of the sixth inverter T6 receives the third-phase control signal PWM C, and the output end of the sixth inverter T6 is connected to the gate of the ninth switch tube V9.

[0066] Specifically, by setting the fifth inverter T5 at the gate of the sixth switch tube V6, and the sixth inverter T6 at the gate of the ninth switch tube V9, and sending the third-phase control signal PWM C to the gate of the third switch tube V3, the gate of the twelfth switch tube V12, the fifth inverter T5 and the sixth inverter T6, on the basis that the third-phase full-bridge drive module 130 only receives the third-phase control signal PWM C, the upper and lower bridge arms in the third-phase full-bridge drive module 130 are complementary driven, and the diagonal bridge arms are synchronously driven.

[0067] It should be noted that the motor control system in the prior art usually drives the motor by a three-phase half-bridge drive method, such as Figure 1 As shown, when Figure 1 When the A phase upper bridge and B phase lower bridge of the motor are turned on, the internal resistance of the switch tube, wire, and battery is ignored. Assuming that the parameters of each phase winding of the motor are the same, the current flows from the positive pole of the power supply → switch tube V13 → A phase winding → B phase winding → switch tube V20 → negative pole of the power supply. Assume that the battery voltage is U dc The phase voltage of phases A and B loaded on the motor is U a , U b , then U a =U b =0.5U dc The motor speed is directly related to the loaded phase voltage. If the ratio coefficient of the loaded motor phase voltage per volt to the speed is k, then the motor speed n = k*U a= k * U b =k*0.5*U dc .

[0068] Compared with the motor control system in the prior art, in the embodiment of the utility model, under the condition that the motor winding parameters remain unchanged, the utility model changes the half-bridge drive in the prior art into a full-bridge drive, so that each phase of the motor is a full-bridge drive. Under the same input voltage and current, the motor speed can be doubled without reducing the maximum output torque.

[0069] Figure 4 The circuit conduction diagram of the motor control system provided by the embodiment of the utility model is as follows: Figure 4 As shown, when the first phase A and the second phase B of the motor are turned on, the first switch tube V1, the tenth switch tube V10, the eighth switch tube V8 and the fifth switch tube V5 are turned on, and the first phase A of the motor and the power supply BAT form a current loop 1, and the second phase B of the motor and the power supply BAT form a current loop 2. Current loop 1: from the positive pole of the power supply BAT → the first switch tube V1 → the first phase A winding of the motor → the tenth switch tube V10 → the negative pole of the power supply BAT; current loop 2 is from the positive pole of the power supply BAT → the eighth switch tube V8 → the second phase B winding of the motor → the fifth switch tube V5 → the negative pole of the power supply BAT. Assume that the voltage of the power supply BAT is U dc The phase voltages loaded on the first phase A and the second phase B of the motor are U a1 , U b1 , then U a1 =U b1 =U dc Since the winding parameters of the motor have not changed, the proportional coefficient of the motor phase voltage per volt and the speed is still k, so the motor speed n1=k*U a = k * U b = k * U dc , from the above we can get n1:n=(k*U dc ):(k*0.5*U dc )=2, that is, when the motor winding parameters remain unchanged, the motor control system of this embodiment can double the motor speed. It should be noted that the maximum output torque of the motor is related to the number of turns of the stator winding of the motor. Since the embodiment of the utility model does not change the number of turns of the stator winding of the motor, under the same input voltage and current, the motor speed controlled by the motor control system of the embodiment of the utility model can be increased without reducing the maximum output torque.

[0070] In the embodiment of the utility model, the motor control system will perform power limitation. When the load reaches the maximum output power of the motor control system, the bus current of the motor control system will be limited, and each switch tube in the motor control system will perform chopped output. The bus current remains unchanged, the phase line current continues to rise, and the output torque continues to increase. Therefore, as long as the motor winding parameters do not change, the maximum output torque of the motor control system remains unchanged. In summary, in the embodiment of the utility model, when the motor winding and rotor parameters remain unchanged, the half-bridge drive is changed to a full-bridge drive. Under the same input voltage and current, the motor can double its speed without reducing the maximum output torque.

[0071] Optionally, in an embodiment of the present invention, the switch tubes in the first phase full-bridge drive module 110, the second phase full-bridge drive module 120 and the third phase full-bridge drive module 130 are all field effect transistors, insulated gate bipolar transistors, turn-off thyristors or power transistors.

[0072] Specifically, the switching tubes in the first phase full-bridge drive module 110, the second phase full-bridge drive module 120 and the third phase full-bridge drive module 130 can be effect transistors, insulated gate bipolar transistors, turn-off thyristors or power transistors, and have the same model and can be controlled by the same control signal.

[0073] The technical solution of the embodiment of the utility model provides a motor control system, adopts a full-bridge drive mode, and compared with the half-bridge drive mode in the prior art, under the same input voltage and current, the motor speed can be increased without reducing the number of motor stator turns and the maximum output torque of the motor. The utility model can solve the problem that the motor speed and torque cannot be taken into account in the prior art, and can increase the motor speed without reducing the maximum output torque of the motor, so that the electric vehicle can run faster and climb more powerfully.

[0074] The utility model also provides an electric vehicle, including the motor control system in the above embodiments, which can achieve the same technical effects as the motor control systems in the above embodiments. The electric vehicle can run fast and climb slopes more powerfully.

[0075] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention is described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A motor control system, characterized in that: It includes a power supply, a first-phase full-bridge drive module, a second-phase full-bridge drive module and a third-phase full-bridge drive module; The first input end of the first-phase full-bridge driving module is connected to the first end of the power supply, the second input end of the first-phase full-bridge driving module is connected to the second end of the power supply, the first output end of the first-phase full-bridge driving module is connected to one end of the first phase of the motor, and the second output end of the first-phase full-bridge driving module is connected to the other end of the first phase of the motor; The control end of the first-phase full-bridge driving module is used to receive a first-phase control signal; The first input end of the second-phase full-bridge driving module is connected to the first end of the power supply, the second input end of the second-phase full-bridge driving module is connected to the second end of the power supply, the first output end of the second-phase full-bridge driving module is connected to one end of the second phase of the motor, and the second output end of the second-phase full-bridge driving module is connected to the other end of the second phase of the motor; The control end of the second-phase full-bridge driving module is used to receive a second-phase control signal; The first input end of the third-phase full-bridge drive module is connected to the first end of the power supply, the second input end of the third-phase full-bridge drive module is connected to the second end of the power supply, the first output end of the third-phase full-bridge drive module is connected to one end of the third phase of the motor, and the second output end of the third-phase full-bridge drive module is connected to the other end of the third phase of the motor; The control end of the third-phase full-bridge driving module is used to receive a third-phase control signal.

2. The motor control system according to claim 1, characterized in that: The first-phase full-bridge drive module includes a first upper bridge arm, a first lower bridge arm, a second upper bridge arm and a second lower bridge arm; the first upper bridge arm and the first lower bridge arm are connected in series between the first end and the second end of the power supply; the common connection end of the first upper bridge arm and the first lower bridge arm is connected to one end of the first phase of the motor; the second upper bridge arm and the second lower bridge arm are connected in series between the first end and the second end of the power supply, and the common connection end of the second upper bridge arm and the second lower bridge arm is connected to the other end of the first phase of the motor; The second-phase full-bridge drive module includes a third upper bridge arm, a third lower bridge arm, a fourth upper bridge arm and a fourth lower bridge arm; the third upper bridge arm and the third lower bridge arm are connected in series between the first end and the second end of the power supply; the common connection end of the third upper bridge arm and the third lower bridge arm is connected to one end of the second phase of the motor; the fourth upper bridge arm and the fourth lower bridge arm are connected in series between the first end and the second end of the power supply, and the common connection end of the fourth upper bridge arm and the fourth lower bridge arm is connected to the other end of the second phase of the motor; The third-phase full-bridge drive module includes a fifth upper bridge arm, a fifth lower bridge arm, a sixth upper bridge arm and a sixth lower bridge arm; the fifth upper bridge arm and the fifth lower bridge arm are connected in series between the first end and the second end of the power supply; the common connection end of the fifth upper bridge arm and the fifth lower bridge arm is connected to one end of the third phase of the motor; the sixth upper bridge arm and the sixth lower bridge arm are connected in series between the first end and the second end of the power supply, and the common connection end of the sixth upper bridge arm and the sixth lower bridge arm is connected to the other end of the third phase of the motor.

3. The motor control system according to claim 2, characterized in that: The first upper bridge arm includes a first switch tube, the second upper bridge arm includes a seventh switch tube, the first lower bridge arm includes a fourth switch tube, and the second lower bridge arm includes a tenth switch tube; The drain of the first switch tube and the drain of the seventh switch tube are both connected to the positive electrode of the power supply, the source of the first switch tube is connected to one end of the first phase of the motor and the drain of the fourth switch tube, the source of the seventh switch tube is connected to the other end of the first phase of the motor and the drain of the tenth switch tube; the source of the fourth switch tube and the source of the tenth switch tube are both connected to the negative electrode of the power supply; The gate of the first switch tube and the gate of the tenth switch tube both receive the first phase control signal; the gate of the fourth switch tube and the gate of the seventh switch tube both receive an inverse signal of the first phase control signal.

4. The motor control system according to claim 3, characterized in that: The first-phase full-bridge driving module further includes a first inverter and a second inverter; The input end of the first inverter receives the first phase control signal, and the output end of the first inverter is connected to the gate of the fourth switch tube; An input end of the second inverter receives the first phase control signal, and an output end of the second inverter is connected to a gate of the seventh switch tube.

5. The motor control system according to claim 2, characterized in that: The third upper bridge arm includes a second switch tube, the fourth upper bridge arm includes an eighth switch tube, the third lower bridge arm includes a fifth switch tube, and the fourth lower bridge arm includes an eleventh switch tube; The drain of the second switch tube and the drain of the eighth switch tube are both connected to the positive electrode of the power supply, the source of the second switch tube is connected to one end of the second phase of the motor and the drain of the fifth switch tube, the source of the eighth switch tube is connected to the other end of the second phase of the motor and the drain of the eleventh switch tube; the source of the fifth switch tube and the source of the eleventh switch tube are both connected to the negative electrode of the power supply; The gate of the second switch tube and the gate of the eleventh switch tube both receive the second phase control signal; the gate of the eighth switch tube and the gate of the fifth switch tube both receive the inverse signal of the second phase control signal.

6. The motor control system according to claim 5, characterized in that: The second-phase full-bridge driving module further includes a third inverter and a fourth inverter; The input end of the third inverter receives the second phase control signal, and the output end of the third inverter is connected to the gate of the fifth switch tube; An input end of the fourth inverter receives the second phase control signal, and an output end of the fourth inverter is connected to the gate of the eighth switch tube.

7. The motor control system according to claim 2, characterized in that: The fifth upper bridge arm includes a third switch tube, the sixth upper bridge arm includes a ninth switch tube, the fifth lower bridge arm includes a sixth switch tube, and the sixth lower bridge arm includes a twelfth switch tube; The drain of the third switch tube and the drain of the ninth switch tube are both connected to the positive electrode of the power supply, the source of the third switch tube is connected to one end of the third phase of the motor and the drain of the sixth switch tube, the source of the ninth switch tube is connected to the other end of the third phase of the motor and the drain of the twelfth switch tube; the source of the sixth switch tube and the source of the twelfth switch tube are both connected to the negative electrode of the power supply; The gate of the third switch tube and the gate of the twelfth switch tube both receive the third phase control signal; the gate of the ninth switch tube and the gate of the sixth switch tube both receive the inverse signal of the third phase control signal.

8. The motor control system according to claim 7, characterized in that: The third-phase full-bridge driving module further includes a fifth inverter and a sixth inverter; The input end of the fifth inverter receives the third phase control signal, and the output end of the fifth inverter is connected to the gate of the sixth switch tube; The input end of the sixth inverter receives the third phase control signal, and the output end of the sixth inverter is connected to the gate of the ninth switch tube.

9. The motor control system according to any one of claims 1 to 8, characterized in that: The switch tubes in the first-phase full-bridge drive module, the second-phase full-bridge drive module and the third-phase full-bridge drive module are all field effect transistors, insulated gate bipolar transistors, turn-off thyristors or power transistors.

10. An electric vehicle, characterized in that: Comprising a motor control system as claimed in any one of claims 1-9.

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