Control system of motor

Abstract

The invention provides a control system of a motor, the motor comprises a first coil, a second coil, a third coil and a fourth coil, the second end of the first coil is connected with the first end of the third coil, the second end of the second coil is connected with the first end of the fourth coil, and the control system comprises a motor driving device, comprising a first switching circuit and a second switching circuit, the first switching circuit is connected with the first end of a first coil and the second end of a fourth coil, and the second switching circuit is connected with the first end of a second coil, the second end of the fourth coil and the second end of a third coil; and the control device is connected with the first switching circuit and the second switching circuit and is used for controlling the first switching circuit and the second switching circuit to act according to a comparison result of a voltage value of power supply access of the motor driving device and a preset voltage value so as to switch connection modes of the first coil, the second coil, the third coil and the fourth coil. The connection modes include a parallel mode and a series mode.

Description

Technical Field

[0001] The present invention relates to the field of control technology, and in particular to a control system of a motor. Background Art

[0002] In different usage scenarios, the motor can achieve power output or load drive.

[0003] However, in different usage scenarios, the power supplied to the motor drive device in the motor control system may also be different.

[0004] In the related technical solutions, the control system of the motor can only be used in a single area. The control system of the motor cannot ensure the safe use of the motor and is prone to electricity risks. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0006] To this end, the present invention provides a control system for a motor.

[0007] In view of this, the present invention provides a control system of a motor, wherein the motor comprises a first coil, a second coil, a third coil and a fourth coil, wherein the second end of the first coil is connected to the first end of the third coil, and the second end of the second coil is connected to the first end of the fourth coil, and the control system comprises: a motor driving device, comprising: a first switching circuit and a second switching circuit, wherein the first switching circuit is respectively connected to the first end of the first coil and the second end of the fourth coil, and the second switching circuit is connected to the first end of the second coil, the second end of the fourth coil, and the second end of the third coil; a control device, connected to the first switching circuit and the second switching circuit, and used for controlling the action of the first switching circuit and the second switching circuit according to a comparison result between a voltage value of a power supply connected to the motor driving device and a preset voltage value, so as to switch a connection mode of the first coil, the second coil, the third coil and the fourth coil, wherein the connection mode comprises a parallel mode and a series mode.

[0008] The technical solution of the present application provides a control system for a motor, which includes a motor drive device and a control device.

[0009] The motor driving device includes a first switch circuit and a second switch circuit, wherein the first switch circuit and the second switch circuit can adjust the connection mode of the first coil, the second coil, the third coil and the fourth coil in the motor.

[0010] Specifically, when the connection mode is the parallel mode, the second end of the third coil is connected to the first end of the second coil, and the second end of the fourth coil is connected to the first end of the first coil. At this time, the first coil and the third coil are connected in series and then connected in parallel with the second coil and the fourth coil which are also in a series relationship.

[0011] When the connection mode is the series mode, the second end of the third coil is connected to the second end of the fourth coil. At this time, the first coil, the second coil, the third coil and the fourth coil are connected in series.

[0012] In the above calculation scheme of the present application, the connection relationship between the first coil, the second coil, the third coil and the fourth coil can be adjusted by setting the first switch circuit and the second switch circuit.

[0013] Specifically, by comparing the voltage value of the power supply connected to the motor drive device with a preset voltage value, the size of the voltage value currently connected to the motor drive device is determined according to the comparison result, and then the first switching circuit and the second switching circuit are used to adjust the connection relationship between the first coil, the second coil, the third coil and the fourth coil.

[0014] In this process, by adjusting the connection relationship between the first coil, the second coil, the third coil and the fourth coil, the control system of the motor can adapt to the usage scenarios of different power supply voltages, thereby getting rid of the disadvantage of the related technical solutions that the control system of the motor can only be used in a single area.

[0015] By adjusting the connection relationship between the first coil, the second coil, the third coil and the fourth coil, the voltage resistance safety of the coils of the motor is ensured, thereby reducing the probability of damage to the motor due to overvoltage.

[0016] In addition, by adjusting the connection relationship between the first coil, the second coil, the third coil and the fourth coil so that the mode of the motor coil is adapted to the current power supply usage scenario, the working efficiency of the motor is improved.

[0017] In one of the technical solutions, the first coil, the second coil, the third coil and the fourth coil mentioned above are stator coils in the motor.

[0018] In one of the technical solutions, the preset voltage value can be 245 volts.

[0019] In addition, the control system of the motor proposed in this application also has the following additional technical features.

[0020] In the above technical solution, the operation of the first switch circuit and the second switch circuit is controlled according to the comparison result between the voltage value of the power supply connected to the motor drive device and the preset voltage value, specifically including: when the voltage value is greater than the preset voltage value, the first level is output to the first switch circuit and the second switch circuit to make the first coil, the second coil, the third coil and the fourth coil enter the series mode; when the voltage value is less than or equal to the preset voltage value, the second level is output to the first switch circuit and the second switch circuit to make the first coil, the second coil, the third coil and the fourth coil enter the parallel mode.

[0021] In this technical solution, when the voltage value is greater than the preset voltage value, it is considered that the voltage value of the motor drive device connected to the power supply is too high. At this time, by outputting the first level, the first switch circuit and the second switch circuit are controlled to be in the first state. In the first state, the first coil, the second coil, the third coil and the fourth coil in the motor are in series mode. At this time, the first coil, the second coil, the third coil and the fourth coil share the power supply connected to the motor drive device. At this time, the average voltage on each coil is relatively small, thereby ensuring the voltage resistance safety of the motor coil.

[0022] When the voltage value is less than or equal to the preset voltage value, it is considered that the voltage value of the motor drive device connected to the power supply is low. At this time, the second level is output to control the first switch circuit and the second switch circuit to be in the second state. In the second state, the first coil, the second coil, the third coil and the fourth coil are in parallel mode. At this time, the first coil and the third coil are connected in series to share the power supply for the motor drive device, and the second coil and the fourth coil are connected in series to share the power supply for the motor drive device.

[0023] In this state, the voltage shared by a single coil in different connection modes is close to the same, and the shared voltage is below the maximum withstand voltage of the coil, thus ensuring the voltage resistance safety of the motor coil.

[0024] In addition, if the voltage value is less than or equal to the preset voltage value, and the first coil, the second coil, the third coil and the fourth coil are still in series mode, the voltage shared by each coil is relatively small. In this state, the working efficiency of the motor is relatively low. By adjusting it to the parallel mode, the voltage shared by each coil is increased, thereby improving the working efficiency of the motor.

[0025] In any of the above technical solutions, the first switching circuit includes: a first switching tube, a control end of the first switching tube is connected to the control device, and a first end of the first switching tube is grounded; a first relay, a first end of the first relay is connected to the second end of the first switching tube, and the second end of the first relay is used to connect to the power supply, a third end of the first relay is connected to the second end of the fourth coil, and a fourth end of the first relay is connected to the first end of the first coil.

[0026] In this technical solution, the topological structure of the first switch circuit is refined, wherein the first switch circuit includes a first switch tube and a first relay. The use of the first relay can achieve isolation control, avoid direct control of high voltage and high current lines, improve the safety of motor drive control, and reduce the probability of control system failure.

[0027] In addition, the first switch tube is provided so as to utilize the first switch tube to realize the control of the state of the first relay.

[0028] Among them, the first switching tube can be a triode, a field effect tube, or other devices with switch state adjustment. It can be selected according to actual use needs, and its specific selection will not be repeated here.

[0029] In one of the technical solutions, when the control device outputs a first level, the first switch tube is turned off and the first relay is not energized, and when the control device outputs a second level, the first switch tube is turned on and the first relay is energized.

[0030] In the above technical solution, since the second end of the first relay is connected to the power supply, the power supply can supply power to the second end of the first switch tube through the second end of the first relay and the first end of the first relay.

[0031] When the first switch tube is in the on state, the second end of the first switch tube is connected to the first end of the first switch tube, and a loop is formed between the second end of the first relay, the first end of the first relay, the second end of the first switch tube and the first end of the first switch tube. The first relay is energized, and the second end of the fourth coil and the first end of the first coil are connected together.

[0032] On the contrary, when the first switch tube is in the cut-off state, the second end of the first switch tube is not conductive with the first end of the first switch tube. At this time, a loop cannot be formed between the second end of the first relay, the first end of the first relay, the second end of the first switch tube and the first end of the first switch tube. The first relay is not energized, and the second end of the fourth coil is disconnected from the first end of the first coil.

[0033] In any of the above technical solutions, the first switch circuit further includes: a first resistor, located between the first end of the first relay and the second end of the first switch tube.

[0034] In this technical solution, by setting the first resistor, when the first switch tube is in the on state, the first resistor can be connected in series in the loop between the second end of the first relay, the first end of the first relay, the second end of the first switch tube and the first end of the first switch tube, thereby increasing the resistance value in the above loop. When the resistance value in the loop increases, the current value flowing through the loop will decrease. At this time, the current flowing through the first switch tube is reduced, reducing the probability of the first switch tube being damaged due to overcurrent, thereby protecting the first switch tube.

[0035] In the above technical solution, the first resistor not only plays a current limiting effect, but also reduces the probability of the first switch tube being damaged due to overcurrent, thereby improving the reliability of the motor control system.

[0036] In the above technical solution, the resistance value of the first resistor can be selected according to actual design requirements, which will not be elaborated here.

[0037] In any of the above technical solutions, the second switching circuit includes: a second switching tube, a control end of the second switching tube is connected to the control device, and a first end of the second switching tube is grounded; a second relay, a first end of the second relay is connected to the second end of the third coil, a second end of the second relay is connected to the second end of the fourth coil, a third end of the second relay is connected to the second end of the second switching tube, a fourth end of the second relay is used to connect to the power supply, and a fifth end of the second relay is connected to the first end of the second coil.

[0038] In this technical solution, the topological structure of the second switch circuit is refined, wherein the second switch circuit includes a second switch tube and a second relay. The use of the second relay can achieve isolation control, avoid direct control of high voltage and high current lines, improve the safety of motor drive control, and reduce the probability of control system failure.

[0039] In addition, the second switch tube is provided so as to utilize the second switch tube to realize the control of the state of the second relay.

[0040] Among them, the second switching tube can be a triode, a field effect tube, or other devices with switch state adjustment. It can be selected according to actual use needs, and its specific selection will not be repeated here.

[0041] In one of the technical solutions, when the control device outputs a first level, the second switch tube is turned off and the second relay is not energized. At this time, the second end of the third coil is connected to the second end of the fourth coil. At this time, the first coil, the second coil, the third coil and the fourth coil are in series mode. When the control device outputs a second level, the second switch tube is turned on, the second relay is energized, and the second end of the third coil is connected to the first end of the second coil. At this time, the first coil, the second coil, the third coil and the fourth coil are in parallel mode.

[0042] In the above technical solution, since the fourth end of the second relay is connected to the power supply, the power supply can supply power to the second end of the second switch tube through the fourth end of the second relay and the third end of the second relay.

[0043] When the second switch tube is in the on state, the second end of the second switch tube is connected to the first end of the second switch tube. At this time, a loop is formed between the fourth end of the second relay, the third end of the second relay, the second end of the second switch tube and the first end of the second switch tube, the second relay is energized, and the second end of the third coil is connected to the first end of the second coil.

[0044] On the contrary, when the second switch tube is in the cut-off state, the second end of the second switch tube is not conductive with the first end of the second switch tube. At this time, a loop cannot be formed between the fourth end of the second relay, the third end of the second relay, the second end of the second switch tube and the first end of the second switch tube. The second relay is not energized, and the second end of the third coil is connected to the second end of the fourth coil.

[0045] In any of the above technical solutions, the second switch circuit further includes: a second resistor, located between the third end of the second relay and the second end of the second switch tube.

[0046] In this technical solution, by setting the second resistor, when the second switch tube is in the on state, the second resistor can be connected in series in the loop between the third end of the second relay, the fourth end of the second relay, the second end of the second switch tube and the first end of the second switch tube, thereby increasing the resistance value in the above loop. When the resistance value in the loop increases, the current value flowing through the loop will decrease. At this time, the current flowing through the second switch tube is reduced, reducing the probability of the second switch tube being damaged due to overcurrent, thereby protecting the second switch tube.

[0047] In the above technical solution, the second resistor not only plays a current limiting effect, but also reduces the probability of the second switch tube being damaged due to overcurrent, thereby improving the reliability of the motor control system.

[0048] In the above technical solution, the resistance value of the second resistor can be selected according to actual design requirements, which will not be elaborated here.

[0049] In any of the above technical solutions, the motor drive device also includes: a third switch tube, a first end of the third switch tube is used to connect to the power supply; a fourth switch tube, a first end of the fourth switch tube is used to connect to the power supply; a fifth switch tube, a first end of the fifth switch tube is connected to the second end of the third switch tube and the first end of the second coil, and the second end of the fifth switch tube is grounded; a sixth switch tube, a first end of the sixth switch tube is connected to the second end of the fourth switch tube and the first end of the first coil, and the second end of the sixth switch tube is grounded; a first drive circuit is connected to the control device, the control end of the fourth switch tube and the control end of the sixth switch tube; a second drive circuit is connected to the control device, the control end of the third switch tube and the control end of the fifth switch tube; wherein the control device is used to output a pulse width modulation signal to the first drive circuit and the second drive circuit to control the third switch tube, the fourth switch tube, the fifth switch tube and the sixth switch tube to be turned on and off.

[0050] In this technical solution, the third switch tube, the fourth switch tube, the fifth switch tube, the sixth switch tube and their connection relationship can provide an alternating signal to the first coil, the second coil, the third coil and the fourth coil of the motor, so that the first coil, the second coil, the third coil and the fourth coil generate an alternating magnetic field to drive the motor rotor to rotate.

[0051] Specifically, the control device uses a pulse width modulation signal to achieve that when the third switch tube and the sixth switch tube are in the on state, the fourth switch tube and the fifth switch tube are in the off state. At the same time, when the third switch tube and the sixth switch tube are in the off state, the fourth switch tube and the fifth switch tube are in the on state.

[0052] Since the pulse width modulation signal is output to the first driving circuit and the second driving circuit, the above-mentioned state can be repeatedly changed, thereby stabilizing the operation of the motor.

[0053] In the above technical solution, the third switch tube, the fourth switch tube, the fifth switch tube, and the sixth switch tube can be insulated gate bipolar transistor (IGBT) semiconductor devices, or other semiconductor devices, which are selected according to actual use needs and will not be described in detail here.

[0054] In the above technical solution, the first driving circuit is connected to the control end of the fourth switch tube and the control end of the sixth switch tube, and the fourth switch tube and the sixth switch tube are on the same circuit, so it can reduce the difficulty of assembly.

[0055] In any of the above technical solutions, the first driving circuit includes: a first driving chip, a first pin of the first driving chip is used to connect to the power supply, a second pin and a third pin of the first driving chip are used to receive the modulation signals of the fourth switch tube and the sixth switch tube respectively, a fourth pin of the first driving chip is used to be grounded, a fifth pin of the first driving chip is connected to the control end of the sixth switch tube, and a seventh pin of the first driving chip is connected to the control end of the fourth switch tube; a third resistor, a first end of the third resistor is used to connect to the first power supply, and a second end of the third resistor is connected to the eighth pin of the first driving chip; a first capacitor, and the first capacitor is respectively connected to the eighth pin of the first driving chip and the sixth pin of the first driving chip.

[0056] In this technical solution, the topological structure of the first driving circuit is refined, wherein the first driving chip can output corresponding voltages using the fifth pin and the seventh pin according to the input modulation signal, thereby realizing driving control of the fourth switch tube and the sixth switch tube.

[0057] During this process, the first driver chip can simultaneously receive the modulation signals of the fourth switch tube and the sixth switch tube, and realize the drive control of the fourth switch tube and the sixth switch tube. There is no need to set up separate driver chips for the third switch tube and the fifth switch tube, thereby reducing the volume of the first driver circuit.

[0058] In the above technical solution, the first capacitor is provided so as to charge the charge pump in the first driver chip using the first capacitor, thereby enabling the first driver chip to operate normally.

[0059] In the above technical solution, a third resistor is set so that the third resistor can be used to limit the current of the voltage provided by the first power supply to the first driver chip, thereby reducing the probability of the first driver chip being damaged due to overcurrent caused by excessive current provided by the first power supply, thereby ensuring the reliability of the motor control system.

[0060] In any of the above technical solutions, the first driving circuit further includes: a first diode located between the second end of the third resistor and the eighth pin of the first driving chip.

[0061] In this technical solution, the first diode is provided to utilize the unidirectional conduction characteristic of the diode to limit the current flow direction of the circuit where the third resistor is located, thereby reducing the reverse flow of current into the first power supply, thereby reducing the probability of damage to the first power supply.

[0062] In the above technical solution, the anode of the first diode is connected to the third resistor, and the cathode of the first diode is connected to the eighth pin of the first driving chip.

[0063] In any of the above technical solutions, the first driving circuit also includes: a fourth resistor, a first end of the fourth resistor is connected to the control end of the fourth switch tube, and a second end of the fourth resistor is connected to the second end of the fourth switch tube and the sixth pin.

[0064] In this technical solution, the fourth resistor is provided so as to utilize the fourth resistor to prevent the fourth switch tube from being mis-turned on, thereby ensuring the stability of the control system of the motor.

[0065] Specifically, as can be seen above, when a high level is input to the control end of the fourth switch tube, the fourth switch tube is turned on, and when the first driver chip has no output, the seventh pin of the first driver chip is in a suspended state, and at this time, the fourth switch tube may be mistakenly turned on.

[0066] The fourth resistor is provided so that the voltage of the control end of the fourth switch tube can be pulled down by the fourth resistor, thereby preventing the seventh pin of the first driving chip from being turned on when it is in a suspended state.

[0067] In one of the technical solutions, a fourth resistor is provided so that a sufficiently large voltage difference can be formed between the control end and the second end of the fourth switch tube, and then when the fourth switch tube needs to be controlled to be turned on, the above voltage difference can realize the control of the conduction of the fourth switch tube.

[0068] In any of the above technical solutions, the first driving circuit further includes: a fifth resistor, located between the seventh pin of the first driving chip and the control end of the fourth switch tube.

[0069] In this technical solution, the fifth resistor is provided so as to utilize the fifth resistor to limit the current flowing through the fourth switch tube, thereby reducing the probability of the fourth switch tube being damaged due to overcurrent.

[0070] In the above technical solution, the resistance value of the fifth resistor can be determined according to actual use requirements, which will not be elaborated here.

[0071] In any of the above technical solutions, the first driving circuit further includes: a sixth resistor, a first end of the sixth resistor is connected to the control end of the sixth switch tube, and a second end of the sixth resistor is connected to the second end of the sixth switch tube.

[0072] In this technical solution, the sixth resistor is provided so as to utilize the sixth resistor to prevent the sixth switch tube from being mis-turned on, thereby ensuring the stability of the control system of the motor.

[0073] Specifically, as can be seen above, when a high level is input to the control end of the sixth switch tube, the sixth switch tube is turned on, and when the first driver chip has no output, the fifth pin of the first driver chip is in a suspended state, and at this time, the sixth switch tube may be mistakenly turned on.

[0074] By providing the sixth resistor, the voltage of the control terminal of the sixth switch tube can be pulled down by the sixth resistor, thereby preventing the fifth pin of the first driving chip from being turned on when it is in a suspended state.

[0075] In one of the technical solutions, a sixth resistor is provided so that a sufficiently large voltage difference can be formed between the control end and the second end of the sixth switch tube, and then when the sixth switch tube needs to be controlled to be turned on, the above voltage difference can realize the control of the conduction of the sixth switch tube.

[0076] In any of the above technical solutions, the first driving circuit further includes: a seventh resistor, located between the fifth pin of the first driving chip and the control end of the sixth switch tube.

[0077] In this technical solution, the seventh resistor is provided so as to utilize the seventh resistor to limit the current flowing through the sixth switch tube, thereby reducing the probability of the sixth switch tube being damaged due to overcurrent.

[0078] In the above technical solution, the resistance value of the seventh resistor can be determined according to actual use requirements, which will not be described in detail here.

[0079] In any of the above technical solutions, the control system also includes: a power supply device connected to the input end of the motor drive device and the control device for outputting power; and a voltage detection device connected to the input end of the motor drive device for detecting a voltage value.

[0080] In any of the above technical solutions, the control system also includes: a speed detection circuit for obtaining the operating speed of the motor; a current detection circuit for obtaining the operating current of the motor; a control device connected to the first drive circuit, the second drive circuit, the speed detection circuit, and the current detection circuit, and used to drive the first drive circuit and the second drive circuit to operate according to the operating speed, operating current, and voltage value.

[0081] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0082] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0083] Figure 1 A schematic block diagram of a control system of a motor in an embodiment of the present invention is shown;

[0084] Figure 2 A topological schematic diagram of a first switch circuit in an embodiment of the present invention is shown;

[0085] Figure 3 A topological schematic diagram of a second switch circuit in an embodiment of the present invention is shown;

[0086] Figure 4 A topological schematic diagram of a motor and a speed detection circuit in an embodiment of the present invention is shown;

[0087] Figure 5 A topological schematic diagram of a motor drive device in an embodiment of the present invention is shown;

[0088] Figure 6 A control logic schematic diagram of a control system of a motor in an embodiment of the present invention is shown.

[0089] in, Figures 1 to 5 The corresponding relationship between the reference numerals and the component names is as follows:

[0090] 100 motor, L1 first coil, L2 second coil, L3 third coil, L4 fourth coil, 102 motor driving device, 1022 first switch circuit, 1024 second switch circuit, 104 control device, Q1 first switch tube, REL1 first relay, R1 first resistor, Q2 second switch tube, REL2 second relay, R2 second resistor, Q3 third switch tube, Q4 fourth switch tube, Q5 fifth switch tube, Q6 sixth switch tube, 106 first drive circuit, 108 second drive circuit, U1 first drive chip, R 3 the third resistor, C1 the first capacitor, D1 the first diode, R4 the fourth resistor, R5 the fifth resistor, R6 the sixth resistor, R7 the seventh resistor, 110 the power supply device, 112 the voltage detection device, 114 the speed detection circuit, 116 the current detection circuit, R8 the eighth resistor, R9 the ninth resistor, R10 the tenth resistor, R11 the eleventh resistor, R12 the twelfth resistor, R13 the thirteenth resistor, R14 the fourteenth resistor, R15 the fifteenth resistor, U2 the second driving chip, C2 the second capacitor, D2 the second diode, VDD the first power supply. DETAILED DESCRIPTION

[0091] In order to more clearly understand the above aspects, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0092] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0093] In one embodiment of the present application, Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, a control system of a motor is provided. The motor 100 includes a first coil L1, a second coil L2, a third coil L3 and a fourth coil L4. The second end of the first coil L1 is connected to the first end of the third coil L3, and the second end of the second coil L2 is connected to the first end of the fourth coil L4. The control system includes: a motor driving device 102, including: a first switch circuit 1022 and a second switch circuit 1024. The first switch circuit 1022 is respectively connected to the first end of the first coil L1 and the second end of the fourth coil L4, and the second switch circuit 1024 is connected to the first end of the second coil L2, the second end of the fourth coil L4, and the second end of the third coil L3; a control device 104 is connected to the first switch circuit 1022 and the second switch circuit 1024, and is used to control the first switch circuit 1022 and the second switch circuit 1024 to operate according to a comparison result between a voltage value connected to the power supply of the motor driving device 102 and a preset voltage value, so as to switch a connection mode of the first coil L1, the second coil L2, the third coil L3 and the fourth coil L4, and the connection mode includes a parallel mode and a series mode.

[0094] The embodiment of the present application provides a control system for a motor, which includes a motor driving device 102 and a control device 104 .

[0095] The motor driving device 102 includes a first switch circuit 1022 and a second switch circuit 1024 , wherein the first switch circuit 1022 and the second switch circuit 1024 can adjust the connection mode of the first coil L1 , the second coil L2 , the third coil L3 and the fourth coil L4 in the motor 100 .

[0096] Specifically, when the connection mode is the parallel mode, the second end of the third coil L3 is connected to the first end of the second coil L2, and the second end of the fourth coil L4 is connected to the first end of the first coil L1. At this time, the first coil L1 and the third coil L3 are connected in series and then connected in parallel with the second coil L2 and the fourth coil L4, which are also in a series relationship.

[0097] When the connection mode is the series mode, the second end of the third coil L3 is connected to the second end of the fourth coil L4. At this time, the first coil L1, the second coil L2, the third coil L3 and the fourth coil L4 are connected in series.

[0098] In the above calculation scheme of the present application, the connection relationship among the first coil L1 , the second coil L2 , the third coil L3 and the fourth coil L4 can be adjusted by setting the first switch circuit 1022 and the second switch circuit 1024 .

[0099] Specifically, by comparing the voltage value of the power supply connected to the motor drive device 102 with the preset voltage value, so as to determine the size of the voltage value currently connected to the motor drive device 102 according to the comparison result, and then using the first switch circuit 1022 and the second switch circuit 1024 to adjust the connection relationship between the first coil L1, the second coil L2, the third coil L3 and the fourth coil L4.

[0100] In this process, by adjusting the connection relationship between the first coil L1, the second coil L2, the third coil L3 and the fourth coil L4, the control system of the motor can adapt to the usage scenarios of different power supply voltages, thereby avoiding the disadvantage that the control system of the motor can only be used in a single area in the relevant embodiments.

[0101] By adjusting the connection relationship among the first coil L1 , the second coil L2 , the third coil L3 and the fourth coil L4 , the voltage resistance safety of the coils of the motor 100 is ensured, thereby reducing the probability of damage to the motor 100 due to overvoltage.

[0102] In addition, by adjusting the connection relationship between the first coil L1, the second coil L2, the third coil L3 and the fourth coil L4 so that the mode of the motor 100 coil is adapted to the current power supply usage scenario, the working efficiency of the motor 100 is improved.

[0103] In one embodiment, the first coil L1 , the second coil L2 , the third coil L3 and the fourth coil L4 mentioned above are stator coils in the motor 100 .

[0104] In one embodiment, the preset voltage value may be 245 volts.

[0105] In the above embodiment, the operation of the first switch circuit 1022 and the second switch circuit 1024 is controlled according to the comparison result between the voltage value of the power supply connected to the motor drive device 102 and the preset voltage value, specifically including: when the voltage value is greater than the preset voltage value, the first level is output to the first switch circuit 1022 and the second switch circuit 1024 so that the first coil L1, the second coil L2, the third coil L3 and the fourth coil L4 enter the series mode; when the voltage value is less than or equal to the preset voltage value, the second level is output to the first switch circuit 1022 and the second switch circuit 1024 so that the first coil L1, the second coil L2, the third coil L3 and the fourth coil L4 enter the parallel mode.

[0106] In this embodiment, when the voltage value is greater than the preset voltage value, it is considered that the voltage value of the motor drive device 102 connected to the power supply is too high. At this time, by outputting the first level, the first switch circuit 1022 and the second switch circuit 1024 are controlled to be in the first state. In the first state, the first coil L1, the second coil L2, the third coil L3 and the fourth coil L4 in the motor 100 are in series mode. At this time, the first coil L1, the second coil L2, the third coil L3 and the fourth coil L4 share the power supply connected to the motor drive device 102. At this time, the average voltage on each coil is relatively small, so the voltage resistance safety of the coil of the motor 100 is guaranteed.

[0107] When the voltage value is less than or equal to the preset voltage value, it is considered that the voltage value of the motor drive device 102 connected to the power supply is low. At this time, the second level is output to control the first switch circuit 1022 and the second switch circuit 1024 to be in the second state. In the second state, the first coil L1, the second coil L2, the third coil L3 and the fourth coil L4 are in parallel mode. At this time, the first coil L1 and the third coil L3 are connected in series to share the power supply for the motor drive device 102, and the second coil L2 and the fourth coil L4 are connected in series to share the power supply for the motor drive device 102.

[0108] In this state, the voltage shared by a single coil in different connection modes is close to the same, and the shared voltage is below the maximum withstand voltage of the coil, thereby ensuring the voltage resistance safety of the coil of the motor 100.

[0109] In addition, if the voltage value is less than or equal to the preset voltage value, the first coil L1, the second coil L2, the third coil L3 and the fourth coil L4 are still in series mode, then the voltage shared by each coil is relatively small. In this state, the working efficiency of the motor 100 is relatively low. By adjusting it to the parallel mode, the voltage shared by each coil is increased, thereby improving the working efficiency of the motor 100.

[0110] In any of the above embodiments, the first switch circuit 1022 includes: a first switch tube Q1, a control end of the first switch tube Q1 is connected to the control device 104, and a first end of the first switch tube Q1 is grounded; a first relay REL1, a first end of the first relay REL1 is connected to the second end of the first switch tube Q1, and the second end of the first relay REL1 is used to connect to the power supply, a third end of the first relay REL1 is connected to the second end of the fourth coil L4, and a fourth end of the first relay REL1 is connected to the first end of the first coil L1.

[0111] In this embodiment, the topological structure of the first switch circuit 1022 is refined, wherein the first switch circuit 1022 includes a first switch tube Q1 and a first relay REL1. The use of the first relay REL1 can achieve isolation control, avoid direct control of high voltage and high current lines, improve the safety of the drive control of the motor 100, and reduce the probability of failure of the control system.

[0112] In addition, the first switch tube Q1 is provided so as to utilize the first switch tube Q1 to realize the control of the state of the first relay REL1 .

[0113] The first switch tube Q1 may be a triode, a field effect tube, or other devices with switch state adjustment, which may be selected according to actual use needs, and its specific selection will not be described in detail here.

[0114] In one embodiment, when the control device 104 outputs a first level, the first switch tube Q1 is turned off and the first relay REL1 is not energized, and when the control device 104 outputs a second level, the first switch tube Q1 is turned on and the first relay REL1 is energized.

[0115] In the above embodiment, since the second end of the first relay REL1 is connected to the power supply, the power supply can supply power to the second end of the first switch tube Q1 through the second end of the first relay REL1 and the first end of the first relay REL1.

[0116] When the first switch tube Q1 is in the on state, the second end of the first switch tube Q1 is connected to the first end of the first switch tube Q1, and a loop is formed between the second end of the first relay REL1, the first end of the first relay REL1, the second end of the first switch tube Q1 and the first end of the first switch tube Q1, the first relay REL1 is energized, and the second end of the fourth coil L4 and the first end of the first coil L1 are connected together.

[0117] On the contrary, when the first switch tube Q1 is in the cut-off state, the second end of the first switch tube Q1 is not conductive with the first end of the first switch tube Q1, and at this time, a loop cannot be formed between the second end of the first relay REL1, the first end of the first relay REL1, the second end of the first switch tube Q1 and the first end of the first switch tube Q1, the first relay REL1 is not attracted, and the second end of the fourth coil L4 and the first end of the first coil L1 are disconnected.

[0118] In any of the above embodiments, the first switch circuit 1022 further includes: a first resistor R1 located between the first end of the first relay REL1 and the second end of the first switch tube Q1.

[0119] In this embodiment, the first resistor R1 is provided so that when the first switch tube Q1 is in the on state, the first resistor R1 can be connected in series in a loop between the second end of the first relay REL1, the first end of the first relay REL1, the second end of the first switch tube Q1 and the first end of the first switch tube Q1, thereby increasing the resistance value in the above loop. When the resistance value in the loop increases, the current value flowing through the loop will decrease. At this time, the current flowing through the first switch tube Q1 is reduced, reducing the probability of the first switch tube Q1 being damaged due to overcurrent, thereby protecting the first switch tube Q1.

[0120] In the above embodiment, the first resistor R1 not only plays a current limiting effect, but also reduces the probability of the first switch tube Q1 being damaged due to overcurrent, thereby improving the reliability of the motor control system.

[0121] In the above embodiment, the resistance value of the first resistor R1 can be selected according to actual design requirements, which will not be described in detail here.

[0122] In any of the above embodiments, the second switch circuit 1024 includes: a second switch tube Q2, the control end of the second switch tube Q2 is connected to the control device 104, and the first end of the second switch tube Q2 is grounded; a second relay REL2, the first end of the second relay REL2 is connected to the second end of the third coil L3, the second end of the second relay REL2 is connected to the second end of the fourth coil L4, the third end of the second relay REL2 is connected to the second end of the second switch tube Q2, the fourth end of the second relay REL2 is used to connect to the power supply, and the fifth end of the second relay REL2 is connected to the first end of the second coil L2.

[0123] In this embodiment, the topological structure of the second switch circuit 1024 is refined, wherein the second switch circuit 1024 includes a second switch tube Q2 and a second relay REL2. The use of the second relay REL2 can achieve isolation control, avoid direct control of high voltage and high current lines, and improve the safety of the drive control of the motor 100, thereby reducing the probability of failure of the control system.

[0124] In addition, the second switch tube Q2 is provided so as to utilize the second switch tube Q2 to realize the control of the state of the second relay REL2.

[0125] The second switch tube Q2 can be a triode, a field effect tube, or other devices with switch state adjustment, which can be selected according to actual use needs, and its specific selection will not be repeated here.

[0126] In one embodiment, when the control device 104 outputs a first level, the second switch tube Q2 is turned off and the second relay REL2 is not energized. At this time, the second end of the third coil L3 is connected to the second end of the fourth coil L4. At this time, the first coil L1, the second coil L2, the third coil L3 and the fourth coil L4 are in a series mode. When the control device 104 outputs a second level, the second switch tube Q2 is turned on, the second relay REL2 is energized, and the second end of the third coil L3 is connected to the first end of the second coil L2. At this time, the first coil L1, the second coil L2, the third coil L3 and the fourth coil L4 are in a parallel mode.

[0127] In the above embodiment, since the fourth end of the second relay REL2 is connected to power supply, the power supply can supply power to the second end of the second switch tube Q2 through the fourth end of the second relay REL2 and the third end of the second relay REL2.

[0128] When the second switch tube Q2 is in the on state, the second end of the second switch tube Q2 is connected to the first end of the second switch tube Q2. At this time, a loop is formed between the fourth end of the second relay REL2, the third end of the second relay REL2, the second end of the second switch tube Q2 and the first end of the second switch tube Q2. The second relay REL2 is energized, and the second end of the third coil L3 is connected to the first end of the second coil L2.

[0129] On the contrary, when the second switch tube Q2 is in the cut-off state, the second end of the second switch tube Q2 is not conductive with the first end of the second switch tube Q2. At this time, no loop can be formed between the fourth end of the second relay REL2, the third end of the second relay REL2, the second end of the second switch tube Q2 and the first end of the second switch tube Q2. The second relay REL2 is not energized, and the second end of the third coil L3 is connected to the second end of the fourth coil L4.

[0130] In any of the above embodiments, the second switch circuit 1024 further includes: a second resistor R2 located between the third end of the second relay REL2 and the second end of the second switch tube Q2.

[0131] In this embodiment, the second resistor R2 is provided so that when the second switch tube Q2 is in the on state, the second resistor R2 can be connected in series in the loop between the third end of the second relay REL2, the fourth end of the second relay REL2, the second end of the second switch tube Q2 and the first end of the second switch tube Q2, thereby increasing the resistance value in the above loop. When the resistance value in the loop increases, the current value flowing in the loop will decrease. At this time, the current flowing through the second switch tube Q2 is reduced, reducing the probability of the second switch tube Q2 being damaged due to overcurrent, thereby protecting the second switch tube Q2.

[0132] In the above embodiment, the second resistor R2 not only plays a current limiting effect, but also reduces the probability of the second switch tube Q2 being damaged due to overcurrent, thereby improving the reliability of the motor control system.

[0133] In the above embodiment, the resistance value of the second resistor R2 can be selected according to actual design requirements, which will not be described in detail here.

[0134] In any of the above embodiments, the motor driving device 102 further includes: a third switch tube Q3, wherein a first end of the third switch tube Q3 is used to connect to a power supply; a fourth switch tube Q4, wherein a first end of the fourth switch tube Q4 is used to connect to a power supply; a fifth switch tube Q5, wherein a first end of the fifth switch tube Q5 is connected to a second end of the third switch tube Q3 and a first end of the second coil L2, and a second end of the fifth switch tube Q5 is grounded; a sixth switch tube Q6, wherein a first end of the sixth switch tube Q6 is connected to a second end of the fourth switch tube Q4 and a first end of the first coil L1, and a second end of the sixth switch tube Q6 is grounded; a first drive circuit 106, which is connected to the control device 104, a control end of the fourth switch tube Q4, and a control end of the sixth switch tube Q6; and a second drive circuit 108, which is connected to the control device 104, a control end of the third switch tube Q3, and a control end of the fifth switch tube Q5; wherein the control device 104 is used to output a pulse width modulation signal to the first drive circuit 106 and the second drive circuit 108 to control the third switch tube Q3, the fourth switch tube Q4, the fifth switch tube Q5, and the sixth switch tube Q6 to be turned on and off.

[0135] In this embodiment, the third switch tube Q3, the fourth switch tube Q4, the fifth switch tube Q5, the sixth switch tube Q6 and their connection relationship can provide an alternating signal to the first coil L1, the second coil L2, the third coil L3 and the fourth coil L4 of the motor 100, so that the first coil L1, the second coil L2, the third coil L3 and the fourth coil L4 generate an alternating magnetic field to drive the rotor of the motor 100 to rotate.

[0136] Specifically, the control device 104 uses a pulse width modulation signal to achieve that when the third switch tube Q3 and the sixth switch tube Q6 are in the on state, the fourth switch tube Q4 and the fifth switch tube Q5 are in the off state. At the same time, when the third switch tube Q3 and the sixth switch tube Q6 are in the off state, the fourth switch tube Q4 and the fifth switch tube Q5 are in the on state.

[0137] Since pulse width modulation signals are output to the first driving circuit 106 and the second driving circuit 108 , the above-mentioned state can be repeatedly changed, thereby stabilizing the operation of the motor 100 .

[0138] In the above embodiments, the third switch tube Q3, the fourth switch tube Q4, the fifth switch tube Q5, and the sixth switch tube Q6 can be insulated gate bipolar transistor (IGBT) semiconductor devices, or other semiconductor devices, which are selected according to actual use needs and will not be described in detail here.

[0139] In the above embodiment, the first driving circuit 106 is connected to the control end of the fourth switch tube Q4 and the control end of the sixth switch tube Q6, and the fourth switch tube Q4 and the sixth switch tube Q6 are on the same circuit, so it can reduce the difficulty of assembly.

[0140] In any of the above embodiments, the first driving circuit 106 includes: a first driving chip U1, a first pin of the first driving chip U1 is used to connect to the power supply, a second pin and a third pin of the first driving chip U1 are used to receive the modulation signals of the fourth switch tube Q4 and the sixth switch tube Q6 respectively, a fourth pin of the first driving chip U1 is used to be grounded, a fifth pin of the first driving chip U1 is connected to the control end of the sixth switch tube Q6, and a seventh pin of the first driving chip U1 is connected to the control end of the fourth switch tube Q4; a third resistor R3, a first end of the third resistor R3 is used to connect to the first power supply VDD, and a second end of the third resistor R3 is connected to the eighth pin of the first driving chip U1; a first capacitor C1, and the first capacitor C1 is connected to the eighth pin of the first driving chip U1 and the sixth pin of the first driving chip U1 respectively.

[0141] In this embodiment, the topology of the first driving circuit 106 is refined, wherein the first driving chip U1 can output corresponding voltages using the fifth pin and the seventh pin according to the input modulation signal, thereby realizing driving control of the fourth switch tube Q4 and the sixth switch tube Q6.

[0142] During this process, the first driver chip U1 can simultaneously receive the modulation signals of the fourth switch tube Q4 and the sixth switch tube Q6, and realize the drive control of the fourth switch tube Q4 and the sixth switch tube Q6. There is no need to set up separate driver chips for the third switch tube Q3 and the fifth switch tube Q5, thereby reducing the volume of the first drive circuit 106.

[0143] In the above embodiment, the first capacitor C1 is provided so that the charge pump in the first driver chip U1 is charged by the first capacitor C1 , thereby enabling the first driver chip U1 to operate normally.

[0144] In the above embodiment, the third resistor R3 is provided so as to utilize the third resistor R3 to limit the current magnitude of the voltage provided by the first power supply VDD to the first driver chip U1, thereby reducing the probability of the first driver chip U1 being damaged due to overcurrent caused by excessive current provided by the first power supply VDD, thereby ensuring the reliability of the motor control system.

[0145] In any of the above embodiments, the first driving circuit 106 further includes: a first diode D1 located between the second end of the third resistor R3 and the eighth pin of the first driving chip U1 .

[0146] In this embodiment, the first diode D1 is provided to limit the current flow direction of the circuit where the third resistor R3 is located by utilizing the unidirectional conduction characteristic of the diode, thereby reducing the reverse flow of current into the first power supply VDD, thereby reducing the probability of damage to the first power supply VDD.

[0147] In the above embodiment, the anode of the first diode D1 is connected to the third resistor R3 , and the cathode of the first diode D1 is connected to the eighth pin of the first driving chip U1 .

[0148] In any of the above embodiments, the first driving circuit 106 further includes: a fourth resistor R4, a first end of the fourth resistor R4 is connected to the control end of the fourth switch tube Q4, and a second end of the fourth resistor R4 is connected to the second end of the fourth switch tube Q4 and the sixth pin.

[0149] In this embodiment, the fourth resistor R4 is provided so as to utilize the fourth resistor R4 to prevent the fourth switch tube Q4 from being mis-turned on, thereby ensuring the stability of the control system of the motor.

[0150] Specifically, as can be seen above, when a high level is input to the control end of the fourth switch tube Q4, the fourth switch tube Q4 is turned on, and when the first driver chip U1 has no output, the seventh pin of the first driver chip U1 is in a suspended state, and at this time, the fourth switch tube Q4 may be mistakenly turned on.

[0151] The fourth resistor R4 is provided so that the voltage of the control end of the fourth switch tube Q4 can be pulled down by the fourth resistor R4, thereby preventing the seventh pin of the first driving chip U1 from being turned on when it is in a suspended state.

[0152] In one embodiment, the fourth resistor R4 is provided so that a sufficiently large voltage difference can be formed between the control end and the second end of the fourth switch tube Q4, and when the fourth switch tube Q4 needs to be controlled to be turned on, the voltage difference can realize the control of turning on the fourth switch tube Q4.

[0153] In any of the above embodiments, the first driving circuit 106 further includes: a fifth resistor R5 located between the seventh pin of the first driving chip U1 and the control end of the fourth switch tube Q4.

[0154] In this embodiment, the fifth resistor R5 is provided so as to utilize the fifth resistor R5 to limit the current flowing through the fourth switch tube Q4 , thereby reducing the probability of the fourth switch tube Q4 being damaged due to overcurrent.

[0155] In the above embodiment, the resistance value of the fifth resistor R5 can be determined according to actual use requirements, which will not be described in detail here.

[0156] In any of the above embodiments, the first driving circuit 106 further includes: a sixth resistor R6, a first end of the sixth resistor R6 is connected to the control end of the sixth switch tube Q6, and a second end of the sixth resistor R6 is connected to the second end of the sixth switch tube Q6.

[0157] In this embodiment, the sixth resistor R6 is provided so as to utilize the sixth resistor R6 to prevent the sixth switch tube Q6 from being mis-turned on, thereby ensuring the stability of the control system of the motor.

[0158] Specifically, as can be seen above, when a high level is input to the control end of the sixth switch tube Q6, the sixth switch tube Q6 is turned on, and when the first driver chip U1 has no output, the fifth pin of the first driver chip U1 is in a suspended state, and at this time, the sixth switch tube Q6 may be mistakenly turned on.

[0159] The sixth resistor R6 is provided so as to utilize the sixth resistor R6 to pull down the voltage of the control end of the sixth switch tube Q6, thereby preventing the fifth pin of the first driving chip U1 from being turned on when it is in a suspended state.

[0160] In one embodiment, the sixth resistor R6 is provided so that a sufficiently large voltage difference can be formed between the control end and the second end of the sixth switch tube Q6, so that when the sixth switch tube Q6 needs to be controlled to be turned on, the above voltage difference can realize the control of the conduction of the sixth switch tube Q6.

[0161] In any of the above embodiments, the first driving circuit 106 further includes: a seventh resistor R7 located between the fifth pin of the first driving chip U1 and the control end of the sixth switch tube Q6 .

[0162] In this embodiment, the seventh resistor R7 is provided so as to utilize the seventh resistor R7 to limit the current flowing through the sixth switch tube Q6 , thereby reducing the probability of the sixth switch tube Q6 being damaged due to overcurrent.

[0163] In the above embodiment, the resistance value of the seventh resistor R7 can be determined according to actual use requirements, which will not be described in detail here.

[0164] In any of the above embodiments, the second driving circuit 108 includes: a second driving chip U2, wherein the first pin of the second driving chip U2 is used to connect to the power supply, the second pin and the third pin of the second driving chip U2 are respectively used to receive the modulation signals of the third switch tube Q3 and the fifth switch tube Q5, the fourth pin of the second driving chip U2 is used to be grounded, the fifth pin of the second driving chip U2 is connected to the control end of the fifth switch tube Q5, and the seventh pin of the second driving chip U2 is connected to the control end of the third switch tube Q3; an eighth resistor R8, wherein the first end of the eighth resistor R8 is used to connect to the first power supply VDD, and the second end of the eighth resistor R8 is connected to the eighth pin of the second driving chip U2; and a second capacitor C2, wherein the second capacitor C2 is respectively connected to the eighth pin of the second driving chip U2 and the sixth pin of the second driving chip U2.

[0165] In any of the above embodiments, the second driving circuit 108 further includes: a second diode D2 located between the second end of the eighth resistor R8 and the eighth pin of the second driving chip U2.

[0166] In any of the above embodiments, the second driving circuit 108 further includes: a ninth resistor R9, a first end of the ninth resistor R9 is connected to the control end of the third switch tube Q3, and a second end of the ninth resistor R9 is connected to the second end of the third switch tube Q3 and the sixth pin.

[0167] In any of the above embodiments, the second driving circuit 108 further includes: a tenth resistor R10 located between the seventh pin of the second driving chip U2 and the control end of the third switch tube Q3.

[0168] In any of the above embodiments, the second driving circuit 108 further includes: an eleventh resistor R11, a first end of the eleventh resistor R11 is connected to the control end of the fifth switch tube Q5, and a second end of the eleventh resistor R11 is connected to the second end of the fifth switch tube Q5.

[0169] In any of the above embodiments, the second driving circuit 108 further includes: a twelfth resistor R12 located between the fifth pin of the second driving chip U2 and the control end of the fifth switch tube Q5.

[0170] In any of the above embodiments, the control system also includes: a power supply device 110 connected to the input end of the motor drive device 102 and the control device 104 for outputting power; a voltage detection device 112 connected to the input end of the motor drive device 102 for detecting a voltage value.

[0171] In any of the above embodiments, the control system also includes: a speed detection circuit 114, which is used to obtain the operating speed of the motor 100; a current detection circuit 116, which is used to obtain the operating current of the motor 100; the control device 104 is connected to the first drive circuit 106, the second drive circuit 108, the speed detection circuit 114, and the current detection circuit 116, and is used to drive the first drive circuit 106 and the second drive circuit 108 to operate according to the operating speed, operating current, and voltage value.

[0172] Specifically, the operating speed, operating current, and voltage value are compared with corresponding target values, so as to adjust the pulse width modulation signal output to the first drive circuit 106 and the second drive circuit 108, thereby achieving the adjustment of the state of the motor 100.

[0173] In the above technical solution, the pulse width modulation signals are H_NU, H_NV, L_NU and L_NU respectively.

[0174] In the above embodiment, the control circuit is also used to output mode selection signals S1 and S2 to achieve the switching of the connection mode.

[0175] Specifically, Figure 6 As shown, its control logic includes:

[0176] Step 602, obtaining the bus voltage VP;

[0177] Step 604, whether the bus voltage VP is greater than a threshold value, if the judgment result is yes, execute step 606, if the judgment result is no, execute step 608;

[0178] Step 606, S1 is set to L, S2 is set to L;

[0179] Step 608, S1 is set to H, S2 is set to H;

[0180] Step 610, running according to the motor control program.

[0181] The bus voltage VP corresponds to the voltage value of the power supply connected to the motor drive device 102 , the threshold value is also the preset voltage value, L is the first level, and H is the second level.

[0182] Specifically, when the mains supply voltage is 220VAC to 240VAC, it is identified as the Chinese / European standard. The S1 and S2 signals are set to L, the motor M3 terminal is connected to M4, and the stator coils L1 to L4 of the motor 100 are in series mode.

[0183] When the mains supply voltage is 100VAC to 130VAC, the voltage is less than 245V, which is recognized as the US / Japan standard. The S1 and S2 signals are set to H, the motor M3 terminal is connected to M2, the motor M1 terminal is connected to M4, and the stator coils L1 to L4 of the motor 100 are in parallel mode.

[0184] In the above embodiment, the parallel mode has a harder mechanical property, is easy to adjust the speed, can bear a larger load, and is suitable for low-speed occasions. The stator coil of the motor 100 adopts the series mode, has a softer mechanical property, and the speed changes greatly with the load, which is suitable for low load and high speed occasions. The working mode of the motor 100 can also be selected according to the load and speed conditions.

[0185] In the above embodiment, the rotation speed detection circuit 114 uses a Hall sensor to collect the rotation speed of the motor 100 and outputs a HAL signal to the control device 104 .

[0186] In the above embodiment, the current detection circuit 116 includes a thirteenth resistor R13, a fourteenth resistor R14 and a fifteenth resistor R15, wherein the thirteenth resistor R13 is located between the second end of the sixth switch tube Q6 and the ground, and the fourteenth resistor R14 is located between the second end of the fifth switch tube Q5 and the ground.

[0187] Specifically, after the second end of the sixth switch tube Q6 is connected to the second end of the fifth switch tube Q5, they are grounded through the thirteenth resistor R13 and the fourteenth resistor R14 respectively, and the first end of the fifteenth resistor R15 is connected to the connection position of the second end of the sixth switch tube Q6 and the second end of the fifth switch tube Q5, so as to obtain the voltage after the thirteenth resistor R13 and the fourteenth resistor R14 are connected in parallel, and the operating current of the motor 100 is output through the fifteenth resistor R15.

[0188] In the above embodiment, the motor is a single-phase brushless DC motor.

[0189] The term "first" or "second" in the specification and claims of the present application may include one or more of the features explicitly or implicitly. In the textual description of the present invention, unless otherwise specified, "plurality" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the objects connected before and after are in an "or" relationship.

[0190] In the claims, specification and drawings of the present invention, the term "multiple" refers to two or more than two. Unless otherwise clearly defined, the orientation or position relationship indicated by the terms "upper" and "lower" is based on the orientation or position relationship shown in the drawings, which is only for the purpose of more conveniently describing the present invention and making the description process simpler, rather than indicating or implying that the device or element referred to must have the specific orientation described, be constructed and operated in a specific orientation, so these descriptions cannot be understood as limiting the present invention; the terms "connect", "install", "fix" and the like should be understood in a broad sense. For example, "connection" can be a fixed connection between multiple objects, or a detachable connection between multiple objects, or an integral connection; it can be a direct connection between multiple objects, or an indirect connection between multiple objects through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood based on the specific circumstances of the above data.

[0191] In the claims, specification and drawings of the present invention, the description of the terms "one embodiment", "some embodiments", "specific embodiments" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In the claims, specification and drawings of the present invention, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0192] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A control system for a motor, characterized in that: The motor includes a first coil, a second coil, a third coil and a fourth coil, the second end of the first coil is connected to the first end of the third coil, the second end of the second coil is connected to the first end of the fourth coil, and the control system includes: The motor drive device comprises: A first switch circuit and a second switch circuit, wherein the first switch circuit is respectively connected to the first end of the first coil and the second end of the fourth coil, and the second switch circuit is connected to the first end of the second coil, the second end of the fourth coil, and the second end of the third coil; a control device, connected to the first switch circuit and the second switch circuit, and used to control the operation of the first switch circuit and the second switch circuit according to the comparison result between the voltage value of the power supply connected to the motor drive device and the preset voltage value, so as to switch the connection mode of the first coil, the second coil, the third coil and the fourth coil, and the connection mode includes a parallel mode and a series mode.

2. The motor control system according to claim 1, characterized in that: The controlling the first switch circuit and the second switch circuit to operate according to the comparison result between the voltage value of the power supply connected to the motor drive device and the preset voltage value specifically includes: When the voltage value is greater than the preset voltage value, outputting a first level to the first switch circuit and the second switch circuit so that the first coil, the second coil, the third coil and the fourth coil enter the series mode; When the voltage value is less than or equal to the preset voltage value, a second level is output to the first switch circuit and the second switch circuit, so that the first coil, the second coil, the third coil and the fourth coil enter the parallel mode.

3. The control system of the motor according to claim 1, characterized in that: The first switch circuit comprises: A first switch tube, wherein a control end of the first switch tube is connected to the control device, and a first end of the first switch tube is grounded; A first relay, wherein the first end of the first relay is connected to the second end of the first switch tube, the second end of the first relay is used to connect to the power supply, the third end of the first relay is connected to the second end of the fourth coil, and the fourth end of the first relay is connected to the first end of the first coil.

4. The control system of the motor according to claim 3, characterized in that: The first switch circuit further includes: The first resistor is located between the first end of the first relay and the second end of the first switch tube.

5. The control system of the motor according to claim 1, characterized in that: The second switch circuit comprises: A second switch tube, wherein a control end of the second switch tube is connected to the control device, and a first end of the second switch tube is grounded; A second relay, a first end of the second relay is connected to the second end of the third coil, a second end of the second relay is connected to the second end of the fourth coil, a third end of the second relay is connected to the second end of the second switch tube, a fourth end of the second relay is used to connect to power supply, and a fifth end of the second relay is connected to the first end of the second coil.

6. The control system of the motor according to claim 5, characterized in that: The second switch circuit further includes: The second resistor is located between the third end of the second relay and the second end of the second switch tube.

7. The control system of a motor according to any one of claims 1 to 6, characterized in that: The motor drive device also includes: A third switch tube, wherein a first end of the third switch tube is used to connect to a power supply; A fourth switch tube, wherein a first end of the fourth switch tube is used to connect to a power supply; a fifth switch tube, wherein a first end of the fifth switch tube is connected to a second end of the third switch tube and a first end of the second coil, and a second end of the fifth switch tube is grounded; a sixth switch tube, wherein a first end of the sixth switch tube is connected to the second end of the fourth switch tube and the first end of the first coil, and a second end of the sixth switch tube is grounded; A first driving circuit is connected to the control device, the control end of the fourth switch tube and the control end of the sixth switch tube; A second driving circuit is connected to the control device, the control end of the third switch tube and the control end of the fifth switch tube; The control device is used to output a pulse width modulation signal to the first drive circuit and the second drive circuit to control the third switch tube, the fourth switch tube, the fifth switch tube and the sixth switch tube to be turned on and off.

8. The control system of the motor according to claim 7, characterized in that: The first driving circuit comprises: a first driver chip, wherein the first pin of the first driver chip is used to connect to the power supply, the second pin and the third pin of the first driver chip are used to receive the modulation signals of the fourth switch tube and the sixth switch tube respectively, the fourth pin of the first driver chip is used to be grounded, the fifth pin of the first driver chip is connected to the control end of the sixth switch tube, and the seventh pin of the first driver chip is connected to the control end of the fourth switch tube; a third resistor, wherein a first end of the third resistor is used to be connected to the first power supply, and a second end of the third resistor is connected to the eighth pin of the first driving chip; A first capacitor is connected to the eighth pin of the first driver chip and the sixth pin of the first driver chip respectively.

9. The control system of the motor according to claim 8, characterized in that: The first driving circuit further includes: The first diode is located between the second end of the third resistor and the eighth pin of the first driving chip.

10. The control system of the motor according to claim 8, characterized in that: The first driving circuit further includes: A fourth resistor, wherein a first end of the fourth resistor is connected to the control end of the fourth switch tube, and a second end of the fourth resistor is connected to the second end of the fourth switch tube and the sixth pin.

11. The control system of the motor according to claim 8, characterized in that: The first driving circuit further includes: The fifth resistor is located between the seventh pin of the first driving chip and the control end of the fourth switch tube.

12. The control system of the motor according to claim 8, characterized in that: The first driving circuit further includes: A sixth resistor, wherein a first end of the sixth resistor is connected to the control end of the sixth switch tube, and a second end of the sixth resistor is connected to the second end of the sixth switch tube.

13. The control system of the motor according to claim 8, characterized in that: The first driving circuit further includes: The seventh resistor is located between the fifth pin of the first driving chip and the control end of the sixth switch tube.

14. The control system of the motor according to claim 7, characterized in that: The control system further comprises: A power supply device, connected to the input end of the motor drive device and the control device, for outputting power; A voltage detection device is connected to the input end of the motor drive device and is used to detect the voltage value.

15. The control system of the motor according to claim 14, characterized in that: The control system further comprises: A speed detection circuit, used for obtaining the running speed of the motor; A current detection circuit, used for obtaining the running current of the motor; The control device is connected to the first drive circuit, the second drive circuit, the speed detection circuit, and the current detection circuit, and is used to drive the first drive circuit and the second drive circuit to operate according to the operating speed, the operating current, and the voltage value.

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