Electric machine and control circuit, control method and device thereof, and readable storage medium

Abstract

The application provides a motor and a control circuit, a control method and device thereof, and a readable storage medium, wherein the motor control circuit comprises: at least two bus lines, the at least two bus lines are used for being connected with the motor; a first capacitor, two ends of the first capacitor are connected with the at least two bus lines respectively; a noise suppression circuit, the noise suppression circuit is connected with the at least two bus lines, and the noise suppression circuit comprises: a control component, a second capacitor and an overcurrent protection component, the overcurrent protection component can divide voltage for the control component and / or control on-off of the control component; wherein the at least two bus lines are used for charging the second capacitor, or the second capacitor charges the first capacitor. The noise suppression circuit solves the noise problem in the motor control device with a small capacitance bus capacitor, and can effectively suppress the system vibration problem caused by the insufficient bus voltage of the motor control system to provide the required voltage for controlling the motor.

Description

Technical Field

[0001] This invention belongs to the field of motor equipment technology, and more specifically, relates to a motor control circuit, a motor control method, a motor control device, a readable storage medium, a motor, and electrical equipment. Background Technology

[0002] Permanent magnet motors are widely used in aerospace, new energy, and home appliance fields due to their advantages in torque density, efficiency, and reliability. The control system of permanent magnet motors with small-capacitance bus capacitors can improve the system power factor and reduce system harmonics through control strategies. On the one hand, the reactor used to reduce harmonic content can be eliminated, and on the other hand, the capacitance value of the bus capacitor can be greatly reduced, thereby reducing system costs.

[0003] However, in the permanent magnet motor control system with small-capacitance bus capacitors, the energy that small-capacitance bus capacitors can store is relatively low. When the system load is heavy, the bus voltage is very likely to drop to a low value or even drop to zero. At this time, because the bus cannot provide the voltage required to control the motor, the motor will experience large torque fluctuations, and large vibrations and noises are also likely to occur in the system. Summary of the Invention

[0004] The present invention aims to solve one of the technical problems existing in the prior art or related technologies.

[0005] In a first aspect, the present invention provides a motor control circuit for controlling a motor. The motor control circuit includes: at least two busbars for connecting to the motor; a first capacitor, the two ends of which are respectively connected to the at least two busbars; and a noise suppression circuit connected to the at least two busbars. The noise suppression circuit includes: a control component, a second capacitor, and an overcurrent protection component, the overcurrent protection component being capable of voltage division for the control component and / or controlling the on / off state of the control component; wherein, the at least two busbars are used to charge the second capacitor, or the second capacitor charges the first capacitor.

[0006] The motor control circuit provided by this invention internally includes at least two buses, a first capacitor, and a noise suppression circuit. The connection method of the above components includes: the at least two buses may include a positive bus and a negative bus, which are respectively connected to the motor; the voltage value of the bus voltage between the at least two buses changes over time.

[0007] Furthermore, the first capacitor is connected between at least two busbars and can be a busbar capacitor. Specifically, the first capacitor can be a small-value capacitor used for energy storage and filtering out higher-frequency switching subharmonics.

[0008] Furthermore, the noise suppression circuit includes a control component and a second capacitor. The control component has two states: an on state and an off state. The second capacitor can be a capacitor with a large capacitance value. The second capacitor with a large capacitance value is used to store energy and charge the first capacitor.

[0009] Furthermore, when the control component in the noise suppression circuit is turned on for the first time, the voltage across the second capacitor in the noise suppression circuit is zero, and the bus voltage will charge the second capacitor, which then enters the charging process.

[0010] Specifically, the aforementioned control unit can switch between an on state and an off state. When the control unit is switched to the on state, it can compare the bus voltage between at least two buses and the voltage across the second capacitor. If the bus voltage is less than the voltage across the second capacitor, the second capacitor will not be charged; if the bus voltage is greater than the voltage across the second capacitor, the bus voltage will begin charging the second capacitor. When the control unit is switched to the off state, it can compare the bus voltage between at least two buses and the voltage across the second capacitor. If the voltage across the second capacitor is less than the bus voltage, the second capacitor does not need to discharge the first capacitor; only if the voltage across the second capacitor is greater than the bus voltage will the second capacitor begin charging the first capacitor.

[0011] In this invention, the motor control circuit internally deploys at least two buses, a first capacitor, and a noise suppression circuit. The noise suppression circuit includes a control component and a second capacitor. The second capacitor can charge the first capacitor under appropriate conditions, thereby maintaining the voltage across the first capacitor and ensuring that the buses provide the voltage required for normal motor control, thus preventing large torque fluctuations in the motor. The noise suppression circuit solves the noise problem in motors with small-value bus capacitors and effectively suppresses system vibration caused by insufficient bus voltage to provide the required voltage for motor control.

[0012] The noise suppression circuit also includes an overcurrent protection component. During the turn-on process of the control unit, a large inrush current may be generated due to surge voltage or the voltage difference between the second capacitor and the bus at turn-on. This inrush current can easily cause the control unit to fail. Therefore, the overcurrent protection component is included in the noise suppression circuit to protect the control unit.

[0013] Overcurrent protection components can divide the voltage for control components, thus providing overcurrent protection to the circuit through hardware. They can also control the on / off state of control components, thus providing overcurrent protection to the circuit through control processes.

[0014] Overcurrent protection components have limited protection capabilities for control components. Therefore, in order to ensure the stability of protection for control components, the on / off state of control components is controlled by overcurrent protection components to prevent control components from failing due to overheating, which helps to improve the functional stability of control components.

[0015] In addition, the motor control circuit in the above-described technical solution provided by the present invention may also have the following additional technical features:

[0016] In the above technical solution, at least two busbars include a first busbar and a second busbar.

[0017] In this technical solution, the motor control circuit is equipped with a first bus and a second bus, wherein the first bus is the positive bus and the second bus is the negative bus.

[0018] Furthermore, the noise suppression circuit and the first capacitor are connected between the first bus and the second bus, respectively. The bus voltage can charge the second capacitor inside the noise suppression circuit through the first bus and the second bus.

[0019] Furthermore, the second capacitor inside the noise suppression circuit can charge the first capacitor through the first bus and the second bus.

[0020] Furthermore, the first busbar and the second busbar are respectively connected to the motor and the power supply, and the power supply drives the motor to work through the first busbar and the second busbar.

[0021] In this invention, the motor control circuit connects components such as the noise suppression circuit, the first capacitor, the motor, and the power supply in the same circuit by deploying a first bus and a second bus. This ensures that the bus voltage can charge the second capacitor, thereby ensuring that the second capacitor can charge the first capacitor. At the same time, the power supply supplies power to the motor through the first bus and the second bus, ensuring the normal operation of the motor.

[0022] In the above technical solution, the overcurrent protection component includes: a resistor, with its two ends connected to the control component and the busbar respectively; and a first Zener diode, with its two ends connected to the control component and the busbar respectively.

[0023] In this technical solution, the resistor can be a small-value power resistor, the resistor is connected in series with the control component, and the power transistor is connected in parallel with the resistor.

[0024] After a surge current flows through the control component, a voltage drop occurs in the resistor. Due to the presence of the first Zener diode, the voltage of the control component decreases. At this time, the current flowing through the second capacitor is very large, preventing the control component from entering the cutoff region. When the voltage of the control component drops to near the turn-on voltage, it will stop decreasing. At this point, the control component changes from the variable resistance region to the constant current region, and the current flowing through the control component is effectively suppressed. By incorporating the circuit and the first Zener diode in the noise suppression circuit, the control component can be prevented from failing due to overcurrent, effectively protecting it.

[0025] In one possible application, the breakdown voltage of the first Zener diode is typically selected from 6V to 10V, and the value of the resistor is typically from 0.1Ω to 0.5Ω. By changing the values ​​of the first Zener diode and the resistor, the magnitude of the current entering the constant current region can be adjusted.

[0026] In any of the above technical solutions, the motor control circuit further includes: a second Zener diode, with its two ends connected to the bus and the second capacitor respectively; and a first diode, with its two ends connected to the bus and the second capacitor respectively.

[0027] In this technical solution, the second Zener diode is connected in series with the control component, and the first diode is connected in parallel with the second Zener diode.

[0028] The second Zener diode and the first diode are integrated within the noise suppression circuit. On one hand, the second Zener diode controls the ripple voltage of the second capacitor within a certain range, preventing it from exceeding the capacitor's specifications. On the other hand, by adjusting the charging phase of the second capacitor, the distribution of harmonic current on the grid side can be improved, making it easier for low-speed harmonics to meet relevant requirements.

[0029] Specifically, when the control unit is in the ON state, as the bus voltage rises, when the bus voltage reaches the breakdown voltage of the second Zener diode, the second Zener diode breaks down, and the second capacitor is charged. The peak charging voltage of the second capacitor is the difference between the peak bus voltage and the breakdown voltage of the second Zener diode.

[0030] When the bus voltage is lower than the voltage of the second capacitor, the second capacitor discharges through the first diode, raising the lowest point of the bus voltage and thus effectively suppressing the noise generated when the motor is working.

[0031] By adding a second Zener diode, not only can the ripple voltage and harmonic current be controlled, but the charging timing of the second capacitor can also be adjusted.

[0032] In any of the above technical solutions, the overcurrent protection component includes: a controller connected to the control component, the controller being used to control the on / off state of the control component.

[0033] In this technical solution, when the bus voltage, AC voltage, or current of the control component is collected, the controller can control the on / off state of the control component. In order to avoid the control component from failing due to inrush current, the control component can be turned off when the bus voltage, AC voltage, or current of the control component is too high, so as to prevent the control component from failing due to overheating.

[0034] When the overcurrent protection component is equipped with a resistor and a first Zener diode, after the control component enters the constant current region, its holding time in the constant current region is limited by the SOA curve of the control component. Therefore, it is necessary to turn off the control component based on voltage and current detection to further improve the protection effect of the control component.

[0035] In any of the above technical solutions, the control component includes: a switch, which is connected to the second capacitor and the busbar respectively; and a second diode, which is connected to both ends of the switch.

[0036] In this technical solution, the control component consists of a switch and a second diode, with the switch and the second diode connected in parallel.

[0037] Specifically, the switch inside the control unit is connected in parallel with the second diode. When the switch is on, the second diode is short-circuited by the first switch, and the control unit is in the on state. When the switch is off, the switch is in the open circuit state, the second diode is in the normal state, and the control unit is in the off state.

[0038] Furthermore, the anode of the second diode is connected to the second busbar, and the cathode of the second diode is connected to the second terminal of the second capacitor. When the current flows from the positive terminal to the negative terminal, the second diode is in the conducting state; when the current flows from the positive terminal to the negative terminal, the second diode is in the off state.

[0039] It should be noted that when the second capacitor is in the discharge process, the current in the noise suppression circuit flows through the second diode from the positive terminal to the negative terminal of the second diode; when the second capacitor is in the charging process, the current in the noise suppression circuit flows through the switch and finally into the second capacitor.

[0040] In this invention, the motor control circuit comprises a control component consisting of a switch and a second diode. The state of the control component is switched by changing the switching state of the switch. When the switch is on, the control component is in the ON state, allowing the bus voltage to charge the second capacitor, ensuring the voltage across the second capacitor and thus guaranteeing sufficient energy storage. When the switch is off, the control component is in the OFF state, allowing the second capacitor to charge the first capacitor, ensuring the voltage across the first capacitor and thus guaranteeing the bus provides the voltage required for normal motor operation.

[0041] In any of the above technical solutions, the capacitance of the second capacitor is greater than the capacitance of the first capacitor.

[0042] In this technical solution, the first capacitor is a small-value capacitor, and the second capacitor is an energy storage capacitor inside the noise suppression circuit. The second capacitor is a large-value capacitor compared to the first capacitor.

[0043] The motor control circuit of the present invention, by deploying a second capacitor with a large capacitance value, ensures that the noise suppression circuit can store enough energy to charge the first capacitor, thereby ensuring the voltage value across the first capacitor. By deploying a first capacitor with a small capacitance value, higher frequency switching subharmonics appearing inside the motor control circuit can be filtered out.

[0044] In any of the above technical solutions, the motor control circuit further includes: a speed sensor, electrically connected to the controller, used to collect the motor speed, and the controller controls the control components to be turned on or off according to the motor speed.

[0045] In this technical solution, when the motor is detected to be running at high speed, the controller can keep the control components in a constantly off state. When the motor is detected to be running at low speed, the controller can control the on / off state of the control components based on detected values ​​such as voltage and current.

[0046] When the motor speed is high, the electrical components connected to the motor generate significant noise due to vibration during operation. This noise is sufficient to mask the motor's own noise. Therefore, noise control is not necessary in this case. Conversely, when the motor speed is low, the noise generated by the vibration of the electrical components connected to the motor is less, and this noise is insufficient to mask the motor's own noise. Therefore, noise control is required for the motor.

[0047] By determining whether motor noise needs to be suppressed based on the motor's speed, the motor can be controlled in a targeted manner.

[0048] In any of the above technical solutions, the motor control circuit further includes: a rectifier circuit, which is connected to the power supply and at least two buses respectively, to convert the AC voltage output by the power supply into DC voltage to supply power to the at least two buses; and an inverter circuit, which is connected to the at least two buses and the motor respectively, to convert the DC voltage on the at least two buses into AC voltage to control the operating state of the motor connected to the inverter module.

[0049] In this technical solution, the motor control circuit includes a rectifier circuit and an inverter circuit. The rectifier circuit is connected between the busbars and is connected to the power supply, thereby converting the AC power output by the power supply into DC power, which is then transmitted to the motor through the busbars.

[0050] Specifically, the inverter circuit is connected between the busbars. The inverter circuit converts the DC power output from the rectifier circuit into AC power to drive the motor.

[0051] Specifically, the first capacitor and the noise suppression circuit are respectively disposed between the rectifier circuit and the inverter circuit.

[0052] In this invention, the motor control circuit converts the AC voltage output from the power supply into DC voltage through a rectifier circuit, which can then charge the second capacitor of the noise suppression circuit and facilitate motor control. At the same time, the inverter circuit converts the DC voltage into AC voltage and outputs it to the motor to drive the motor and ensure its normal operation.

[0053] Secondly, the present invention proposes a motor control method for use in a motor control circuit as described in any of the above technical solutions. The control method includes: acquiring the phase of a control component and the bus voltage of the bus; controlling the control component to conduct when the phase of the control component is in a first phase and the bus voltage is less than a first voltage threshold; controlling the control component to disconnect when the phase of the control component is in a second phase and the bus voltage is greater than the first threshold; and controlling the control component to disconnect when the control component is in the conducting state, based on the current of the control component being greater than a current threshold.

[0054] The first phase can be the turn-on phase of the control component, and the second phase can be the turn-off phase of the control component.

[0055] The first voltage threshold is the turn-on voltage value used to control the control component, and the second voltage threshold is the turn-off voltage value used to control the control component.

[0056] The above control method switches the state of the control unit based on whether the control unit is in the first phase or the second phase, and the comparison result of the bus voltage value between the buses with the first voltage threshold and the second voltage threshold. When the control unit is in the first phase and the bus voltage value is less than the first voltage threshold, the control unit is switched to the on state; when the control unit is in the second phase or the bus voltage value is greater than the second voltage threshold, the control unit is switched to the off state.

[0057] In this invention, the motor control method switches the control component to the on state when the phase of the control component is in the first phase and the voltage value of the bus voltage is less than the first voltage threshold. During the charging process of the second capacitor in the noise suppression circuit, the charging voltage of the second capacitor is limited to ensure that the noise suppression circuit can carry out the energy storage process smoothly and improve the stability of the charging process of the second capacitor.

[0058] When the phase of the control component is in the second phase, or when the bus voltage value is greater than the second voltage threshold, the control component is switched to the off state, so that the second capacitor can charge the first capacitor, ensuring the voltage value across the first capacitor and preventing the bus voltage from dropping to a low value. This avoids large torque fluctuations in the motor and effectively reduces motor noise.

[0059] During the turn-on process of the control unit, a large inrush current may be generated due to surge voltage or the voltage difference between the second capacitor and the bus at the time of turn-on. The inrush current can easily cause the control unit to fail. To avoid the control unit failing due to the inrush current, the control unit can be turned off when the current is too high to prevent the control unit from failing due to overheating.

[0060] In the above technical solution, the motor control method further includes: acquiring the motor speed; when the motor speed is greater than or equal to the set speed, controlling the control component to disconnect; when the motor speed is less than the set speed, controlling the control component to turn on or off according to the bus voltage, the phase of the control component and the current of the control component.

[0061] In this technical solution, when the motor is detected to be running at high speed, the controller can keep the control components in a constantly off state. When the motor is detected to be running at low speed, the controller can control the on / off state of the control components based on detected values ​​such as voltage and current.

[0062] When the motor speed is high, the electrical components connected to the motor generate significant noise due to vibration during operation. This noise is sufficient to mask the motor's own noise. Therefore, noise control is not necessary in this case. Conversely, when the motor speed is low, the noise generated by the vibration of the electrical components connected to the motor is less, and this noise is insufficient to mask the motor's own noise. Therefore, noise control is required for the motor.

[0063] By determining whether motor noise needs to be suppressed based on the motor's speed, the motor can be controlled in a targeted manner.

[0064] Thirdly, the present invention proposes a motor control device for use in the motor control circuit of any of the above technical solutions. The control device includes: an acquisition module for acquiring the phase of the control component and the bus voltage of the bus; a control module for controlling the control component to conduct when the phase of the control component is in a first phase and the bus voltage is less than a first voltage threshold; and for controlling the control component to disconnect when the phase of the control component is in a second phase and the bus voltage is greater than the first threshold. The control module is further configured to: control the control component to disconnect when the control component is in the conducting state, based on the current of the control component being greater than a current threshold.

[0065] The first phase can be the turn-on phase of the control component, and the second phase can be the turn-off phase of the control component.

[0066] The first voltage threshold is the turn-on voltage value used to control the control component, and the second voltage threshold is the turn-off voltage value used to control the control component.

[0067] The aforementioned control device switches the state of the control component based on whether the control component is in the first phase or the second phase, and the comparison result of the bus voltage value between the buses with the first voltage threshold and the second voltage threshold. When the control component is in the first phase and the bus voltage value is less than the first voltage threshold, the control component is switched to the on state; when the control component is in the second phase or the bus voltage value is greater than the second voltage threshold, the control component is switched to the off state.

[0068] In this invention, when the phase of the control component is in the first phase and the voltage value of the bus voltage is less than the first voltage threshold, the motor control device switches the control component to the on state. During the charging process of the second capacitor in the noise suppression circuit, the charging voltage of the second capacitor is limited to ensure that the noise suppression circuit can carry out the energy storage process smoothly and improve the stability of the charging process of the second capacitor.

[0069] When the phase of the control component is in the second phase, or when the bus voltage value is greater than the second voltage threshold, the control component is switched to the off state, so that the second capacitor can charge the first capacitor, ensuring the voltage value across the first capacitor and preventing the bus voltage from dropping to a low value. This avoids large torque fluctuations in the motor and effectively reduces motor noise.

[0070] During the turn-on process of the control unit, a large inrush current may be generated due to surge voltage or the voltage difference between the second capacitor and the bus at the time of turn-on. The inrush current can easily cause the control unit to fail. To avoid the control unit failing due to the inrush current, the control unit can be turned off when the current is too high to prevent the control unit from failing due to overheating.

[0071] In the above technical solution, the motor control device further includes: a data acquisition module for acquiring the motor speed; the control module is also used to: control the control component to disconnect when the motor speed is greater than or equal to the set speed; and control the control component to turn on or off according to the bus voltage, the phase of the control component, and the current of the control component when the motor speed is less than the set speed.

[0072] In this technical solution, when the motor is detected to be running at high speed, the controller can keep the control components in a constantly off state. When the motor is detected to be running at low speed, the controller can control the on / off state of the control components based on detected values ​​such as voltage and current.

[0073] When the motor speed is high, the electrical components connected to the motor generate significant noise due to vibration during operation. This noise is sufficient to mask the motor's own noise. Therefore, noise control is not necessary in this case. Conversely, when the motor speed is low, the noise generated by the vibration of the electrical components connected to the motor is less, and this noise is insufficient to mask the motor's own noise. Therefore, noise control is required for the motor.

[0074] By determining whether motor noise needs to be suppressed based on the motor's speed, the motor can be controlled in a targeted manner.

[0075] Fourthly, this invention proposes a motor control device, comprising: a memory and a processor. The memory stores a program, and the processor executes the program to implement the steps of the motor control method as described in any of the above-mentioned technical solutions. It achieves the same technical effects and will not be elaborated further here.

[0076] Fifthly, this invention proposes a readable storage medium on which a program or instructions are stored. When executed by a processor, the program or instructions implement the steps of the motor control method as described in any of the above-mentioned technical solutions. It achieves the same technical effect and will not be elaborated further here.

[0077] Sixthly, the present invention provides an electric motor, comprising: a control device as described in any of the above technical solutions; and / or, a readable storage medium as described in the above technical solutions. It achieves the same technical effects and will not be elaborated further here.

[0078] Seventhly, the present invention provides an electrical device, including a motor as described in the above technical solution. It achieves the same technical effects and will not be elaborated further here.

[0079] Additional aspects and advantages of the invention will become apparent in the following description or may be learned by practice of the invention. Attached Figure Description

[0080] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0081] Figure 1 One of the circuit diagrams of the motor control circuit in an embodiment of the present invention is shown;

[0082] Figure 2A second circuit diagram of the motor control circuit in an embodiment of the present invention is shown;

[0083] Figure 3 The following is a schematic diagram showing the waveforms of the bus voltage before and after noise adjustment in an embodiment of the present invention;

[0084] Figure 4 A flowchart illustrating the motor control method in an embodiment of the present invention is shown;

[0085] Figure 5 One of the schematic block diagrams of the motor control device in an embodiment of the present invention is shown;

[0086] Figure 6 A second schematic block diagram of the motor control device in an embodiment of the present invention is shown.

[0087] in, Figure 1 and Figure 2 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0088] 110 Busbar, 120 First Capacitor, 130 Noise Suppression Circuit, 131 Control Components, 1311 Switch, 1312 Second Diode, 132 Second Capacitor, 133 Overcurrent Protection Component, 134 Resistor, 135 First Zener Diode, 136 Second Zener Diode, 137 First Diode, 138 Controller, 139 Drive Circuit, 140 Motor, 150 Rectifier Circuit, 160 Inverter Circuit. Detailed Implementation

[0089] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0090] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0091] The following reference Figures 1 to 6 This invention describes motor control circuits, motor control methods, motor control devices, readable storage media, motors, and electrical equipment provided according to some embodiments of the present invention.

[0092] Combination Figure 1 and Figure 2As shown, in some embodiments of the present invention, a motor control circuit is provided for controlling a motor. The motor control circuit includes at least two buses 110, a first capacitor 120, and a noise suppression circuit 130. The at least two buses 110 are connected to a motor 140; the two ends of the first capacitor 120 are respectively connected to the at least two buses 110; the noise suppression circuit 130 is connected to the at least two buses 110. The noise suppression circuit 130 includes a control component 131, a second capacitor 132, and an overcurrent protection component 133. The overcurrent protection component 133 is capable of voltage division for the control component 131 and / or controlling the on / off state of the control component 131. The at least two buses 110 are used to charge the second capacitor 132, or the second capacitor 132 charges the first capacitor 120.

[0093] The motor control circuit provided in this embodiment internally includes at least two buses 110, a first capacitor 120, and a noise suppression circuit 130. The connection method of the above components includes: the at least two buses 110 may include a positive bus 110 and a negative bus 110, the positive bus 110 and the negative bus 110 are respectively connected to the motor 140, and the voltage value of the bus voltage between the at least two buses 110 changes over time.

[0094] Furthermore, the first capacitor 120 is connected between at least two busbars 110 and can be a busbar 110 capacitor. Specifically, the first capacitor 120 can be a small-value capacitor used for energy storage and filtering out higher frequency switching harmonics 1311.

[0095] Furthermore, the noise suppression circuit 130 includes a control component 131 and a second capacitor 132. The control component 131 has two states: an on state and an off state. The second capacitor 132 can be a capacitor with a large capacitance value. The second capacitor 132 with a large capacitance value is used to store energy and charge the first capacitor 120.

[0096] Furthermore, when the control component 131 in the noise suppression circuit is turned on for the first time, the voltage across the second capacitor 132 in the noise suppression circuit is zero, and the bus voltage will charge the second capacitor 132, and the second capacitor 132 will enter the charging process.

[0097] Specifically, the control unit 131 can switch between an on state and an off state. When the control unit 131 is switched to the on state, it can compare the bus voltage between at least two buses 110 with the voltage across the second capacitor 132. If the bus voltage is less than the voltage across the second capacitor 132, the second capacitor 132 will not be charged; if the bus voltage is greater than the voltage across the second capacitor 132, the bus voltage will begin charging the second capacitor 132. When the control unit 131 is switched to the off state, it can compare the bus voltage between at least two buses 110 with the voltage across the second capacitor 132. If the voltage across the second capacitor 132 is less than the bus voltage, the second capacitor 132 will not discharge the first capacitor 120; only if the voltage across the second capacitor 132 is greater than the bus voltage will the second capacitor 132 begin charging the first capacitor 120.

[0098] In this embodiment, the motor control circuit internally deploys at least two buses 110, a first capacitor 120, and a noise suppression circuit 130. The noise suppression circuit 130 includes a control component 131 and a second capacitor 132. The second capacitor 132 can charge the first capacitor 120 under appropriate conditions, thereby maintaining the voltage across the first capacitor 120 and ensuring that the bus 110 provides the voltage required for the normal operation of the motor 140, thus preventing large torque fluctuations in the motor 140. The noise suppression circuit 130 solves the noise problem in motor control circuits with small-capacity bus 110 capacitors and can effectively suppress system vibration caused by insufficient bus voltage to provide the voltage required to control the motor 140.

[0099] The noise suppression circuit 130 also includes an overcurrent protection component 133. During the turn-on process of the control component 131, a large inrush current may be generated due to surge voltage or the voltage difference between the second capacitor 132 and the bus 110 at the time of turn-on. The inrush current can easily cause the control component 131 to fail. Therefore, the overcurrent protection component 133 is set in the noise suppression circuit to protect the control component 131.

[0100] The overcurrent protection component 133 can divide the voltage for the control component 131, which is a hardware-based overcurrent protection for the circuit. The overcurrent protection component 133 can also control the on / off state of the control component 131, which is a control-based overcurrent protection for the circuit.

[0101] The overcurrent protection component 133 has limited protection capability for the control component 131. Therefore, in order to ensure the stability of the protection of the control component 131, the overcurrent protection component 133 controls the on / off state of the control component 131 to prevent the control component 131 from failing due to overheating, which is beneficial to improving the functional stability of the control component 131.

[0102] The number of second capacitors 132 can be one, or the number of second capacitors 132 can be multiple, and the multiple second capacitors 132 can be arranged in series and parallel.

[0103] In the above embodiment, at least two busbars 110 include a first busbar and a second busbar.

[0104] In this embodiment, the motor control circuit is equipped with a first bus and a second bus, wherein the first bus is a positive bus 110 and the second bus is a negative bus 110.

[0105] Furthermore, the noise suppression circuit 130 and the first capacitor 120 are connected between the first bus and the second bus, respectively. The bus voltage can charge the second capacitor 132 inside the noise suppression circuit 130 through the first bus and the second bus.

[0106] Furthermore, the second capacitor 132 inside the noise suppression circuit 130 can charge the first capacitor 120 through the first bus and the second bus.

[0107] Furthermore, the first busbar and the second busbar are respectively connected to the motor 140 and the power supply, and the power supply drives the motor 140 to work through the first busbar and the second busbar.

[0108] In this embodiment, the motor control circuit deploys a first bus and a second bus to connect components such as the noise suppression circuit 130, the first capacitor 120, the motor 140, and the power supply in the same circuit. This ensures that the bus voltage can charge the second capacitor 132, thereby ensuring that the second capacitor 132 can charge the first capacitor 120. At the same time, the power supply supplies power to the motor 140 through the first bus and the second bus, ensuring the normal operation of the motor 140.

[0109] like Figure 1 As shown, in the above embodiment, the overcurrent protection component 133 includes: a resistor 134 and a first Zener diode 135. The two ends of the resistor 134 are respectively connected to the control component 131 and the bus 110; the two ends of the first Zener diode 135 are respectively connected to the control component 131 and the bus 110.

[0110] In this embodiment, resistor 134 can be a small-value power resistor 134, resistor 134 is connected in series with control component 131, and power transistor is connected in parallel with resistor 134.

[0111] After the surge current flows through the control component 131, a certain voltage drop will occur in the resistor 134. Due to the presence of the first Zener diode 135, the voltage of the control component 131 decreases. At this time, the current flowing through the second capacitor 132 is very large, and the control component 131 cannot enter the cutoff region. When the voltage of the control component 131 drops to near the turn-on voltage, it will stop decreasing. At this point, the control component 131 changes from the variable resistor 134 region to the constant current region, and the current flowing through the control component 131 is effectively suppressed. By setting up the circuit and the first Zener diode 135 in the noise suppression circuit, the control component 131 can be prevented from failing due to overcurrent, thus effectively protecting the control component 131.

[0112] In one possible application, the breakdown voltage of the first Zener diode 135 is typically selected to be between 6V and 10V, and the value of the resistor 134 is typically between 0.1Ω and 0.5Ω. By changing the values ​​of the first Zener diode 135 and the resistor 134, the magnitude of the current entering the constant current region can be adjusted.

[0113] like Figure 2 As shown, in any of the above embodiments, the motor control circuit further includes: a second Zener diode 136 and a first diode 137, the two ends of the second Zener diode 136 being connected to the bus 110 and the second capacitor 132 respectively; the two ends of the first diode 137 being connected to the bus 110 and the second capacitor 132 respectively.

[0114] In this embodiment, the second Zener diode 136 is connected in series with the control component 131, and the first diode 137 is connected in parallel with the second Zener diode 136.

[0115] The second Zener diode 136 and the first diode 137 are disposed within the noise suppression circuit 130. On one hand, the second Zener diode 136 can control the ripple voltage of the second capacitor 132 within a certain range, avoiding exceeding the device specifications of the second capacitor 132. On the other hand, by adjusting the charging phase of the second capacitor 132, the distribution of grid-side harmonic current can be improved, making it easier for low-speed harmonics to meet relevant requirements.

[0116] Specifically, when the control component 131 is in the ON state, as the bus voltage rises, when the bus voltage reaches the breakdown voltage of the second Zener diode 136, the second Zener diode 136 breaks down, and at this time, the second capacitor 132 is charged. The peak charging voltage of the second capacitor 132 is the difference between the peak voltage of the bus 110 and the breakdown voltage of the second Zener diode 136.

[0117] When the bus voltage is lower than the voltage of the second capacitor 132, the second capacitor 132 discharges through the first diode 137, thereby raising the lowest point of the bus voltage and effectively suppressing the noise generated when the motor 140 is working.

[0118] like Figure 3 As shown, after adjustment by the noise suppression circuit, the lowest point of the bus voltage is significantly raised.

[0119] By adding a second Zener diode 136, not only can the ripple voltage and harmonic current be controlled, but the charging timing of the second capacitor 132 can also be adjusted.

[0120] The second Zener diode 136 and the first diode 137 are connected in parallel.

[0121] Combination Figure 1 and Figure 2 As shown, in any of the above embodiments, the overcurrent protection component 133 includes: a controller 138, which is connected to the control component 131, and the controller 138 is used to control the on / off state of the control component 131.

[0122] In this embodiment, when the bus voltage, AC voltage, or current of the control component 131 is collected, the controller 138 can control the on / off state of the control component 131. In order to avoid the control component 131 from failing due to inrush current, the control component 131 can be turned off when the bus voltage, AC voltage, or current of the control component 131 is too large, so as to prevent the control component 131 from failing due to overheating.

[0123] The overcurrent protection component 133 also includes a drive circuit 139, and the controller 138 can implement control functions through the drive circuit 139.

[0124] With the overcurrent protection component 133 equipped with resistor 134 and first Zener diode 135, after the control component 131 enters the constant current region, its maintenance time in the constant current region is limited by the two-dimensional coordinate curves of the SOA (Safe Operating Area) and drain-source voltage and drain current of the control component 131. Therefore, it is necessary to turn off the control component 131 based on voltage and current detection to further improve the protection effect of the control component 131.

[0125] Combination Figure 1 and Figure 2 As shown, in any of the above embodiments, the control component 131 includes: a switch 1311 and a second diode 1312. The switch 1311 is connected to the second capacitor 132 and the bus 110 respectively; the second diode 1312 is connected to both ends of the switch 1311.

[0126] In this embodiment, the control component 131 consists of a switch 1311 and a second diode 1312, with the switch 1311 and the second diode 1312 connected in parallel.

[0127] Specifically, the switch 1311 inside the control component 131 is connected in parallel with the second diode 1312. When the switch 1311 is turned on, the second diode 1312 is short-circuited by the first switch 1311, and the control component 131 is in the on state. When the switch 1311 is turned off, the switch 1311 is in the open circuit state, the second diode 1312 is in the normal state, and the control component 131 is in the off state.

[0128] Furthermore, the anode of the second diode 1312 is connected to the second busbar, and the cathode of the second diode 1312 is connected to the second terminal of the second capacitor 132. When the current flows from the positive terminal to the negative terminal, the second diode 1312 is in the conducting state; when the current flows from the positive terminal to the negative terminal, the second diode 1312 is in the off state.

[0129] It should be noted that when the second capacitor 132 is in the discharge process, the current in the noise suppression circuit 130 flows through the second diode 1312 from the positive terminal of the second diode 1312 to the negative terminal of the second diode 1312; when the second capacitor 132 is in the charging process, the current in the noise suppression circuit 130 flows through the switch 1311 and finally into the second capacitor 132.

[0130] In one possible application, resistor 134 is connected in series with the source (s) terminal of the second diode 1312, and the first Zener diode 135 is connected in parallel between the gate (g) and source (s) terminals of the second diode 1312.

[0131] In this invention, the motor control circuit comprises a control component 131 consisting of a switch 1311 and a second diode 1312. The state of the control component 131 is switched by changing the state of the switch 1311. When the switch 1311 is on, the control component 131 is in the ON state, allowing the second capacitor 132 to be charged using the bus voltage, ensuring the voltage across the second capacitor 132 and thus ensuring that the second capacitor 132 stores sufficient energy. When the switch 1311 is off, the control component 131 is in the OFF state, allowing the first capacitor 120 to be charged using the second capacitor 132, ensuring the voltage across the first capacitor 120 and thus ensuring that the bus 110 provides the voltage required for the normal operation of the motor 140.

[0132] For example, switch 1311 can be a fully controllable power device such as IGBT (Insulated Gate Bipolar Transistor) or MOSFET (Metal-ion Semiconductor Field-Effect Transistor).

[0133] In any of the above embodiments, the capacitance of the second capacitor 132 is greater than the capacitance of the first capacitor 120.

[0134] In this embodiment, the first capacitor 120 is a small-value capacitor, and the second capacitor 132 is an energy storage capacitor inside the noise suppression circuit 130. The second capacitor 132 is a large-value capacitor relative to the first capacitor 120.

[0135] The motor control circuit of the present invention, by deploying a second capacitor 132 with a large capacitance value, ensures that the noise suppression circuit 130 can store enough energy to charge the first capacitor 120, thereby ensuring the voltage value across the first capacitor 120. By deploying a first capacitor 120 with a small capacitance value, the higher frequency switching harmonics 1311 that occur inside the motor control circuit can be filtered out.

[0136] In any of the above embodiments, the motor control circuit further includes: a speed sensor, which is electrically connected to the controller 138. The speed sensor is used to collect the speed of the motor 140, and the controller 138 controls the control component 131 to be turned on or off according to the speed of the motor 140.

[0137] In this embodiment, when the motor 140 is detected to be operating at high speed, the controller 138 can control the control component 131 to remain in the off state. When the motor 140 is detected to be operating at low speed, the controller 138 can control the on / off state of the control component 131 based on detected values ​​such as voltage and current.

[0138] When the motor 140 rotates at a high speed, the electrical components mounted on the motor 140 generate significant noise due to vibration during operation. This noise is sufficient to mask the noise from the motor 140 itself. Therefore, noise control of the motor 140 is not necessary in this case. However, when the motor 140 rotates at a low speed, the noise generated by the vibration of the electrical components mounted on the motor 140 is less, and this noise is insufficient to mask the noise from the motor 140. Therefore, noise control of the motor 140 is required.

[0139] By determining whether it is necessary to suppress the noise of motor 140 by measuring the speed of motor 140, motor 140 can be controlled in a targeted manner.

[0140] During the high-speed, high-power phase, control component 131 remains off. To control the ripple voltage and ripple current of the second capacitor 132 within the allowable range, the on / off phase of control component 131 needs to be controlled during the low-speed phase. Generally, control component 131 is turned on at the lowest point of the bus voltage and turned off when the bus voltage rises to around 150V. When the bus voltage drops to the voltage of the second capacitor 132 along with the AC side voltage, the second capacitor 132 discharges the bus voltage through the second diode 1312, thus effectively raising the lowest point of the bus voltage.

[0141] Combination Figure 1 and Figure 2 As shown, in any of the above embodiments, the motor control circuit further includes a rectifier circuit 150 and an inverter circuit 160. The rectifier circuit 150 is connected to a power supply and at least two buses 110 respectively, to convert the AC voltage output by the power supply into DC voltage to supply power to the at least two buses 110. The inverter circuit 160 is connected to at least two buses 110 and the motor 140 respectively, to convert the DC voltage on the at least two buses 110 into AC voltage, to control the operating state of the motor 140 connected to the inverter module.

[0142] In this embodiment, the motor control circuit is equipped with a rectifier circuit 150 and an inverter circuit 160. The rectifier circuit 150 is connected between the bus 110 and is connected to the power supply, thereby converting the AC power output by the power supply into DC power, which is then transmitted to the motor 140 through the bus 110.

[0143] Specifically, the inverter circuit is connected between the busbars 110. The inverter circuit converts the DC power output from the rectifier circuit into AC power to drive the motor 140.

[0144] Specifically, the first capacitor 120 and the noise suppression circuit 130 are respectively disposed between the rectifier circuit and the inverter circuit.

[0145] In this invention, the motor control circuit converts the AC voltage output by the power supply into DC voltage through a rectifier circuit, which can then charge the second capacitor 132 of the noise suppression circuit 130 and facilitate the control of the motor 140. At the same time, the inverter circuit converts the DC voltage into AC voltage and outputs it to the motor 140 to drive the motor 140 and ensure the normal operation of the motor 140.

[0146] like Figure 4 As shown, in some embodiments of the present invention, a motor control method is proposed for use in the motor control circuit of any of the above embodiments.

[0147] Motor control methods include:

[0148] Step 402: Receive the phase of the control unit and the bus voltage of the bus;

[0149] Step 404: Based on the control component's phase being in the first phase and the bus voltage being less than or equal to the first voltage threshold, control the control component to turn on; based on the control component's phase being in the second phase and the bus voltage being greater than the first threshold, control the control component to turn off.

[0150] Step 406: When the control component is in the on state, if the current of the control component is greater than the current threshold, the control component is turned off.

[0151] The first phase can be the turn-on phase of the control component, and the second phase can be the turn-off phase of the control component.

[0152] The first voltage threshold is the turn-on voltage value used to control the control component, and the second voltage threshold is the turn-off voltage value used to control the control component.

[0153] The above control method switches the state of the control unit based on whether the control unit is in the first phase or the second phase, and the comparison result of the bus voltage value between the buses with the first voltage threshold and the second voltage threshold. When the phase of the control unit is in the first phase and the bus voltage value is less than the first voltage threshold, the control unit is switched to the on state; when the phase of the control unit is in the second phase, or the bus voltage value is greater than the second voltage threshold, the control unit is switched to the off state.

[0154] In this embodiment, the motor control method switches the control component to the on state when the phase of the control component is in the first phase and the voltage value of the bus voltage is less than the first voltage threshold. During the charging process of the second capacitor in the noise suppression circuit, the charging voltage of the second capacitor is limited to ensure that the noise suppression circuit can carry out the energy storage process smoothly and improve the stability of the charging process of the second capacitor.

[0155] When the phase of the control component is in the second phase, or when the bus voltage value is greater than the second voltage threshold, the control component is switched to the off state, so that the second capacitor can charge the first capacitor, ensuring the voltage value across the first capacitor and preventing the bus voltage from dropping to a low value. This avoids large torque fluctuations in the motor and effectively reduces motor noise.

[0156] During the turn-on process of the control unit, a large inrush current may be generated due to surge voltage or the voltage difference between the second capacitor and the bus at the time of turn-on. The inrush current can easily cause the control unit to fail. To avoid the control unit failing due to the inrush current, the control unit can be turned off when the current is too high to prevent the control unit from failing due to overheating.

[0157] In the above embodiments, the motor control method further includes: acquiring the motor speed; controlling the control component to disconnect when the motor speed is greater than or equal to the set speed; and controlling the control component to turn on or off based on the bus voltage, the phase of the control component, and the current of the control component when the motor speed is less than the set speed.

[0158] In this embodiment, when the motor is detected to be running at high speed, the controller can keep the control component in a constantly off state. When the motor is detected to be running at low speed, the controller can control the on / off state of the control component based on detected values ​​such as voltage and current.

[0159] When the motor speed is high, the electrical components connected to the motor generate significant noise due to vibration during operation. This noise is sufficient to mask the motor's own noise. Therefore, noise control is not necessary in this case. Conversely, when the motor speed is low, the noise generated by the vibration of the electrical components connected to the motor is less, and this noise is insufficient to mask the motor's own noise. Therefore, noise control is required for the motor.

[0160] By determining whether motor noise needs to be suppressed based on the motor's speed, the motor can be controlled in a targeted manner.

[0161] like Figure 5 As shown, in an embodiment of the present invention, a motor control device 500 is provided for the motor control circuit in any of the above embodiments.

[0162] The motor control device 500 includes:

[0163] The acquisition module 510 receives the phase of the control unit and the bus voltage of the bus.

[0164] The control module 520 controls the control component to turn on when the phase of the control component is in the first phase and the bus voltage is less than or equal to a first voltage threshold; and controls the control component to turn off when the phase of the control component is in the second phase and the bus voltage is greater than the first threshold.

[0165] The control module is also used to: when the control component is in the on state, and the current of the control component is greater than the current threshold, control the control component to disconnect.

[0166] The first phase can be the turn-on phase of the control component, and the second phase can be the turn-off phase of the control component.

[0167] The first voltage threshold is the turn-on voltage value used to control the control component, and the second voltage threshold is the turn-off voltage value used to control the control component.

[0168] The aforementioned control device switches the state of the control component based on whether the control component is located in the first phase or the second phase, and the comparison result of the bus voltage value between the buses with the first voltage threshold and the second voltage threshold. When the control component is located in the first phase and the bus voltage value is less than the first voltage threshold, the control component is switched to the on state; when the control component is located in the second phase or the bus voltage value is greater than the second voltage threshold, the control component is switched to the off state.

[0169] In this embodiment, when the phase of the control component is in the first phase and the voltage value of the bus voltage is less than the first voltage threshold, the motor control device switches the control component to the on state. During the charging process of the second capacitor in the noise suppression circuit, the charging voltage of the second capacitor is limited to ensure that the noise suppression circuit can carry out the energy storage process smoothly and improve the stability of the charging process of the second capacitor.

[0170] When the phase of the control component is in the second phase, or the voltage value of the bus voltage is greater than the second voltage threshold, the control component is switched to the off state, so that the second capacitor can charge the first capacitor, ensuring the voltage value across the first capacitor and preventing the bus voltage from dropping to a low value, thereby avoiding large torque fluctuations in the motor and effectively reducing motor noise.

[0171] During the turn-on process of the control unit, a large inrush current may be generated due to surge voltage or the voltage difference between the second capacitor and the bus at the time of turn-on. The inrush current can easily cause the control unit to fail. To avoid the control unit failing due to the inrush current, the control unit can be turned off when the current is too high to prevent the control unit from failing due to overheating.

[0172] In the above embodiments, the motor control device further includes: a data acquisition module for acquiring the motor speed; the control module is also used to: control the control component to disconnect when the motor speed is greater than or equal to the set speed; and control the control component to turn on or off according to the bus voltage, the phase of the control component, and the current of the control component when the motor speed is less than the set speed.

[0173] In this embodiment, when the motor is detected to be running at high speed, the controller can keep the control component in a constantly off state. When the motor is detected to be running at low speed, the controller can control the on / off state of the control component based on detected values ​​such as voltage and current.

[0174] When the motor speed is high, the electrical components connected to the motor generate significant noise due to vibration during operation. This noise is sufficient to mask the motor's own noise. Therefore, noise control is not necessary in this case. Conversely, when the motor speed is low, the noise generated by the vibration of the electrical components connected to the motor is less, and this noise is insufficient to mask the motor's own noise. Therefore, noise control is required for the motor.

[0175] By determining whether motor noise needs to be suppressed based on the motor's speed, the motor can be controlled in a targeted manner.

[0176] like Figure 6As shown, in an embodiment of the present invention, a motor control device 600 is proposed, including a memory 610 and a processor 620. The memory 610 stores a program, and the processor 620 executes the program to implement the steps of the motor control method as described in any of the above embodiments. It can achieve the same technical effects, and will not be elaborated further here.

[0177] In embodiments of the present invention, a readable storage medium is proposed, on which a program or instructions are stored. When the program or instructions are executed by a processor, they implement the steps of the motor control method as described in any of the above embodiments. This achieves the same technical effects and will not be elaborated further here.

[0178] In embodiments of the present invention, a motor is provided, comprising: a control device as described in any of the above embodiments; and / or, a readable storage medium as described in the above embodiments. It achieves the same technical effects and will not be elaborated further here.

[0179] The second capacitor can charge the first capacitor under appropriate conditions, thereby maintaining the voltage across the first capacitor and ensuring that the bus provides the voltage required for the normal operation of the motor, preventing large torque fluctuations in the motor. The noise suppression circuit solves the noise problem in motor control devices with small-value bus capacitors and can effectively suppress system vibration caused by insufficient bus voltage to provide the voltage required for motor control.

[0180] The noise suppression circuit also includes an overcurrent protection component. During the turn-on process of the control unit, a large inrush current may be generated due to surge voltage or the voltage difference between the second capacitor and the bus at turn-on. This inrush current can easily cause the control unit to fail. Therefore, the overcurrent protection component is included in the noise suppression circuit to protect the control unit.

[0181] Overcurrent protection components can divide the voltage for control components, thus providing overcurrent protection to the circuit through hardware. They can also control the on / off state of control components, thus providing overcurrent protection to the circuit through control processes.

[0182] Overcurrent protection components have limited protection capabilities for control components. Therefore, in order to ensure the stability of protection for control components, the on / off state of control components is controlled by overcurrent protection components to prevent control components from failing due to overheating, which helps to improve the functional stability of control components.

[0183] In an embodiment of the present invention, an electrical device is provided, including a motor as described in the above embodiments. It achieves the same technical effects and will not be repeated here.

[0184] Electrical equipment includes: washing machines, dryers, fans, or industrial frequency converters.

[0185] The second capacitor can charge the first capacitor under appropriate conditions, thereby maintaining the voltage across the first capacitor and ensuring that the bus provides the voltage required for the normal operation of the motor, preventing large torque fluctuations in the motor. The noise suppression circuit solves the noise problem in motor control devices with small-value bus capacitors and can effectively suppress system vibration caused by insufficient bus voltage to provide the voltage required for motor control.

[0186] The noise suppression circuit also includes an overcurrent protection component. During the turn-on process of the control unit, a large inrush current may be generated due to surge voltage or the voltage difference between the second capacitor and the bus at turn-on. This inrush current can easily cause the control unit to fail. Therefore, the overcurrent protection component is included in the noise suppression circuit to protect the control unit.

[0187] Overcurrent protection components can divide the voltage for control components, thus providing overcurrent protection to the circuit through hardware. They can also control the on / off state of control components, thus providing overcurrent protection to the circuit through control processes.

[0188] Overcurrent protection components have limited protection capabilities for control components. Therefore, in order to ensure the stability of protection for control components, the on / off state of control components is controlled by overcurrent protection components to prevent control components from failing due to overheating, which helps to improve the functional stability of control components.

[0189] In this invention, the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0190] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0191] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A motor control circuit, characterized by, The motor control circuit is used to control the motor, and the motor control circuit includes: At least two busbars, the at least two busbars being used for connection to the motor; A first capacitor, the two ends of which are respectively connected to the at least two busbars; A noise suppression circuit is connected to the at least two busbars. The noise suppression circuit includes a control component, a second capacitor, and an overcurrent protection component. The overcurrent protection component is capable of voltage division for the control component and / or controlling the on / off state of the control component. Wherein, the at least two busbars are used to charge the second capacitor, or the second capacitor charges the first capacitor; The overcurrent protection component includes: A controller, connected to the control component, is used to control the on / off state of the control component; The motor control circuit further includes: a speed sensor, electrically connected to the controller, for acquiring the speed of the motor; the controller controls the control component to be turned on or off according to the speed of the motor; when the speed of the motor is greater than or equal to the set speed, the controller controls the control component to be turned off; when the speed of the motor is less than the set speed, the controller controls the control component to be turned on or off according to the bus voltage, the phase of the control component, and the current of the control component.

2. The motor control circuit of claim 1, wherein, The overcurrent protection component includes: The resistor has its two ends connected to the control component and the busbar, respectively. The first voltage regulator is connected at both ends to the control component and the busbar, respectively.

3. The motor control circuit of claim 1, wherein, Also includes: The second Zener diode is connected at both ends to the busbar and the second capacitor, respectively. The first diode is connected at both ends to the busbar and the second capacitor, respectively.

4. The motor control circuit of claim 1, wherein, The control component includes: A switch, which is connected to the second capacitor and the busbar respectively; The second diode is connected to both ends of the switch.

5. The motor control circuit according to any one of claims 1 to 3, characterized in that, The capacitance of the second capacitor is greater than that of the first capacitor.

6. A method of controlling an electric motor for use with the electric motor control circuit of any one of claims 1 to 5, characterized by, The control method includes: Obtain the phase of the control component and the bus voltage of the bus; When the phase of the control component is in the first phase and the bus voltage is less than the first voltage threshold, the control component is controlled to be turned on; when the phase of the control component is in the second phase and the bus voltage is greater than the first threshold, the control component is controlled to be turned off. When the control component is in the on state, the control component is controlled to disconnect based on the fact that the current of the control component is greater than the current threshold.

7. The motor control method according to claim 6, characterized by, Also includes: Collect the motor's rotational speed; When the motor speed is greater than or equal to the set speed, the control component is disconnected. When the speed of the motor is less than the set speed, the control component is turned on or off according to the bus voltage, the phase of the control component, and the current of the control component.

8. An electric motor control device for the electric motor control circuit according to any one of claims 1 to 5, characterized by The control device includes: The acquisition module acquires the phase of the control component and the bus voltage of the bus. The control module controls the control component to be turned on when the phase of the control component is in the first phase and the bus voltage is less than the first voltage threshold; and controls the control component to be turned off when the phase of the control component is in the second phase and the bus voltage is greater than the first threshold. The control module is further configured to: when the control component is in the on state, control the control component to disconnect based on the current of the control component being greater than a current threshold.

9. The motor control device of claim 8, wherein, Also includes: The data acquisition module collects the motor's rotational speed. The control module is also used to: control the control component to disconnect when the motor speed is greater than or equal to the set speed; and control the control component to turn on or off according to the bus voltage, the phase of the control component, and the current of the control component when the motor speed is less than the set speed.

10. An electric motor control device characterized by comprising: include: A memory and a processor, wherein the memory stores a program, and the processor executes the program to implement the steps of the motor control method as described in claim 6 or 7.

11. A readable storage medium, characterized by, The readable storage medium stores a program or instructions that, when executed by a processor, implement the steps of the motor control method as described in claim 6 or 7.

12. An electric machine characterized by include: The motor control device as described in any one of claims 8 to 10; And / or, The readable storage medium as described in claim 11.

13. An electrical appliance characterized by include: The motor as described in claim 12.

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