Motor control device, method, motor, readable storage medium, and washing machine

Abstract

This invention proposes a motor control device, a motor control method, a motor, a readable storage medium, and a washing machine. The motor control device is used to control a motor and includes: at least two busbars for connecting to the motor; a first capacitor, with its two ends connected to the at least two busbars respectively; and a noise suppression circuit, with its two ends connected to the at least two busbars respectively, the noise suppression circuit including a control component and a second capacitor. When the control component is in an on state and the busbar voltage between the at least two busbars is greater than the voltage of the second capacitor, the at least two busbars charge the second capacitor; when the control component is in an off state and the voltage of the second capacitor is greater than the busbar voltage, the second capacitor charges the first capacitor.

Description

Technical Field

[0001] This invention relates to the field of motor control technology, and more specifically, to a motor control device, a motor control method, a motor, a readable storage medium, and a washing machine. 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 motor control system. Summary of the Invention

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

[0005] Therefore, the first aspect of the present invention is to provide a motor control device.

[0006] The second aspect of the present invention is to provide a motor control method.

[0007] The third aspect of the present invention is to provide a motor control method.

[0008] A fourth aspect of the present invention is to provide a motor control device.

[0009] The fifth aspect of the present invention is to provide a motor control device.

[0010] The sixth aspect of the present invention is to provide a motor control device.

[0011] The seventh aspect of the present invention is to provide a readable storage medium.

[0012] The eighth aspect of the present invention is to provide an electric motor.

[0013] The ninth aspect of the present invention is to provide a washing machine.

[0014] In view of the above, according to a first aspect of the present invention, a motor control device is provided for controlling a motor. The motor control device 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, the two ends of which are respectively connected to the at least two busbars, the noise suppression circuit including a control component and a second capacitor; wherein, when the control component is in an on state and the busbar voltage between the at least two busbars is greater than the voltage of the second capacitor, the at least two busbars charge the second capacitor; and when the control component is in an off state and the voltage of the second capacitor is greater than the busbar voltage, the second capacitor charges the first capacitor.

[0015] In this technical solution, the motor control device 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, and the voltage value of the bus between the at least two buses changes over time.

[0016] 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.

[0017] 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. Compared to the first capacitor, the second capacitor can be a capacitor with a larger capacitance value. The second capacitor with a larger capacitance value is used to store energy and charge the first capacitor.

[0018] 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, thus initiating the charging process.

[0019] Furthermore, at least two busbars include a first busbar and a second busbar.

[0020] In this technical solution, the motor control device 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.

[0021] 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.

[0022] Furthermore, the second capacitor inside the noise suppression circuit can charge the first capacitor through the first bus and the second bus.

[0023] 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.

[0024] In this invention, the motor control device 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 provides power to the motor through the first bus and the second bus, ensuring the normal operation of the motor.

[0025] 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.

[0026] In this invention, the motor control device 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 motor control devices with small-value bus capacitors and effectively suppresses system vibration caused by insufficient bus voltage to provide the required voltage for motor control.

[0027] The motor control device according to the present invention may further have the following additional technical features:

[0028] In the above technical solution, the noise suppression circuit further includes: a first diode, the cathode of which is connected to a first busbar; a first terminal of a second capacitor connected to the anode of the first diode; a first terminal of a control component connected to the second terminal of the second capacitor, and the second terminal of the control component connected to a second busbar. In this technical solution, the first diode is internally deployed in the noise suppression circuit, and the first diode can limit the direction of current flow within the noise suppression circuit. The first diode is connected in series with the second capacitor and the control component, and is connected between the first busbar and the second capacitor.

[0029] Specifically, the cathode of the first diode is connected to the first busbar, and the anode of the first diode is connected to the first terminal of the second capacitor. The first diode, the second capacitor, and the control component are connected in series between the first busbar and the second busbar.

[0030] Furthermore, based on the unidirectional conductivity of the diode, the current flow direction inside the noise suppression circuit is limited. When the second capacitor is charging, the first diode is in an open state, and current cannot pass through the first diode. When the second capacitor is discharging, the first diode is in a conducting state, and current can flow through the first diode.

[0031] It should be noted that when the control component is switched to the off state, the second capacitor can enter the energy discharge process. The second capacitor can charge the first capacitor. After the current inside the noise suppression circuit flows out of the second capacitor, it flows through the positive terminal and the negative terminal of the first diode in sequence, and finally flows into the first capacitor to complete the charging of the first capacitor.

[0032] In this invention, the motor control device deploys a first diode and, based on the unidirectional conductivity of the diode, limits the current flow direction of the second capacitor in the noise suppression circuit during the charging and discharging processes. At the same time, during the charging process of the second capacitor to the first capacitor, interference from other voltages to the second capacitor is avoided, ensuring that the noise suppression circuit completes the charging process of the first capacitor, thereby increasing the minimum voltage across the first capacitor and preventing large torque fluctuations in the motor.

[0033] In this technical solution, the noise suppression circuit further includes: a first resistor, the first end of which is connected to the first busbar, and the second end of which is connected to the first end of the second capacitor.

[0034] In this technical solution, the noise suppression circuit also includes a first resistor, which is a voltage divider resistor that shares the bus voltage between the first bus and the second bus. The first resistor is connected in series with the second capacitor and the control component, and is also connected between the first bus and the second capacitor.

[0035] Furthermore, the first resistor is connected in series with the second capacitor and the control component. The first resistor can share the bus voltage and prevent a large inrush current from being generated at the moment the second capacitor starts charging, thereby avoiding damage to the second capacitor during the charging process.

[0036] Furthermore, the first resistor and the first diode are connected in parallel between the first bus and the second capacitor.

[0037] It should be noted that when the control unit is switched to the ON state, the second capacitor can enter the charging process. The current inside the noise suppression circuit first flows through the first resistor and then into the second capacitor. When the control unit is switched to the OFF state, the second capacitor can enter the discharging process. The current inside the noise suppression circuit flows out of the second capacitor, then flows through the positive and negative terminals of the first diode, and finally flows into the first capacitor.

[0038] In this invention, the motor control device deploys a first resistor and connects it in series with a second capacitor to share the bus voltage, thereby limiting the voltage across the second capacitor during charging or discharging, reducing the instantaneous inrush current generated when the second capacitor is charging, and ensuring the charging and discharging safety of the noise suppression circuit.

[0039] In the above technical solution, the noise suppression circuit further includes: a first inductor, the first end of which is connected to the first busbar, and the second end of the first resistor is connected to the first end of the second capacitor.

[0040] In this technical solution, a first inductor is also deployed inside the noise suppression circuit. The first inductor is a blocking inductor that blocks the alternating current inside the noise suppression circuit. The first inductor is connected in series with the second capacitor and the control component, and is connected between the first bus and the second capacitor.

[0041] Furthermore, the first inductor is connected in series with the second capacitor and the control component. Based on the characteristics of the inductor, the first inductor can block the AC current flowing into the second capacitor, preventing the AC current from interfering with the charging process of the second capacitor.

[0042] Furthermore, the first inductor and the first diode are connected in parallel between the first bus and the second capacitor.

[0043] It should be noted that when the control unit is switched to the ON state, the second capacitor can enter the charging process. The current inside the noise suppression circuit first flows through the first inductor and then into the second capacitor. When the control unit is switched to the OFF state, the second capacitor can enter the discharging process. The current inside the noise suppression circuit flows out of the second capacitor, then through the positive and negative terminals of the first diode, and finally into the first capacitor.

[0044] In this invention, the motor control device deploys a first inductor connected in series with a second capacitor to block the AC current flowing into the second capacitor, preventing the AC current from interfering with the charging process of the second capacitor, ensuring the stability of the noise suppression circuit, and thus ensuring the noise suppression circuit's effect of reducing motor system noise.

[0045] In the above technical solution, the noise suppression circuit further includes: a second resistor, the first end of which is connected to the anode of the first diode, and the second end of which is connected to the first end of the second capacitor.

[0046] In this technical solution, a second resistor, which is a voltage divider resistor, is also deployed inside the noise suppression circuit. The second resistor is connected in series with the first diode, the second capacitor, and the control component, and is connected between the first busbar and the second capacitor.

[0047] Furthermore, the second resistor is connected in series with the first diode. During the charging process of the second capacitor to the first capacitor, the second resistor can share the voltage of the first capacitor and limit the voltage value across the first capacitor, thereby preventing the first capacitor from being damaged during the charging process.

[0048] Furthermore, the second resistor and the first diode are connected in series, and then connected in parallel with the first inductor between the first bus and the second capacitor.

[0049] It should be noted that when the control unit is switched to the ON state, the second capacitor can enter the charging process. The current inside the noise suppression circuit first flows through the first inductor and then into the second capacitor. When the control unit is switched to the OFF state, the second capacitor can enter the discharging process. The current inside the noise suppression circuit flows out of the second capacitor, first through the second resistor, then through the positive and negative terminals of the first diode, and finally into the first capacitor.

[0050] In this invention, the motor control device deploys a second resistor to share the voltage of the first capacitor during the charging process of the second capacitor inside the noise suppression circuit, thereby limiting the voltage value across the first capacitor. This prevents the first capacitor from being damaged during the charging process, improves the safety of the noise suppression circuit, and prevents the noise suppression circuit from damaging other components.

[0051] In the above technical solution, the control component includes: a first switch, the first end of which is connected to the second end of a second capacitor, and the second end of the first switch is connected to a second busbar; and a second diode, the cathode of which is connected to the second end of the second capacitor, and the cathode of the second diode is connected to the second busbar.

[0052] In this technical solution, the control component consists of a first switch and a second diode, with the first switch and the second diode connected in parallel.

[0053] Specifically, the first switch and the second diode inside the control component are connected in parallel. When the first switch is turned on, the second diode is short-circuited by the first switch, and the control component is in the on state. When the first switch is turned off, the first switch is in the open circuit state, the second diode is in the normal state, and the control component is in the off state.

[0054] 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.

[0055] 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 first switch and finally into the second capacitor.

[0056] In this invention, the motor control device comprises a control component consisting of a first switch and a second diode. The state of the control component is switched by changing the state of the first switch. When the first 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 first switch is off, the control component is in the OFF state, allowing the second capacitor to charge the first capacitor, maintaining the voltage across the first capacitor and ensuring the bus provides the voltage required for normal motor operation.

[0057] In the above technical solution, the capacitance of the second capacitor is greater than that of the first capacitor.

[0058] 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.

[0059] The motor control device 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 device can be filtered out.

[0060] In the above technical solution, the motor control device 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 working state of the motor connected to the inverter module.

[0061] In this technical solution, the motor control device is equipped with 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.

[0062] 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.

[0063] Specifically, the first capacitor and the noise suppression circuit are respectively disposed between the rectifier circuit and the inverter circuit.

[0064] In this invention, the motor control device 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 DC voltage is converted into AC voltage through an inverter circuit and output to the motor to drive it and ensure its normal operation.

[0065] According to a second aspect of the present invention, a motor control method is provided for use in the motor control device proposed in the first aspect of the present invention. The motor control method includes: 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 controlling the control component to disconnect when the phase of the control component is in a second phase or the bus voltage is greater than a second voltage threshold.

[0066] In this technical solution, the state of the control component can be switched according to the phase of the control component and the comparison result between the bus voltage value and the threshold.

[0067] Furthermore, 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.

[0068] Furthermore, 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.

[0069] It is understandable that the above motor control method switches the on and off states of the control components based on the phase of the control components and the voltage value of the bus voltage.

[0070] Specifically, 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.

[0071] The motor control method according to the present invention may also have the following additional technical features:

[0072] In the above technical solution, the motor control method further includes: when the control component is in the on state, and the voltage of the second capacitor is greater than the bus voltage, and the bus voltage is less than or equal to the first voltage threshold, controlling the bus voltage to stop charging the second capacitor.

[0073] In this technical solution, when the control unit and the second control are switched to the on state, and the bus voltage between at least two buses begins to charge the second capacitor, the voltage value of the second capacitor is compared with the voltage value of the bus voltage, and the voltage value of the bus voltage is also compared with the first voltage threshold. When the comparison result shows that the voltage value of the second capacitor is greater than the voltage value of the bus voltage, and the voltage value of the bus voltage is less than or equal to the first voltage threshold, the bus voltage will stop charging the second capacitor.

[0074] Specifically, after at least two buses begin charging the second capacitor, the voltage across the second capacitor will continuously increase. The charging process for the second capacitor is determined by detecting the voltage across the second capacitor and the bus voltage. The detected voltage of the second capacitor is compared with the bus voltage, and the bus voltage is also compared with a first voltage threshold. When the voltage of the second capacitor is greater than the bus voltage, and the bus voltage is less than or equal to the first voltage threshold, it indicates that the second capacitor has been fully charged, and the bus voltage will stop charging the second capacitor.

[0075] In this invention, the motor control method determines whether the charging process of the second capacitor is complete by comparing the voltage value of the second capacitor with the voltage value of the bus voltage, and the voltage value of the bus voltage with a first voltage threshold. The charging process is stopped upon completion of charging. This ensures the completion of the charging process for the second capacitor while preventing excessive energy in the second capacitor, thus avoiding damage to the motor control device.

[0076] According to a third aspect of the present invention, a motor control method is provided for controlling the motor control device proposed in the first aspect of the present invention. The motor control method includes: receiving a pulse signal; controlling the control component to turn on when the phase of the control component is in a first phase and the pulse signal is a high-level signal; and controlling the control component to turn off when the phase of the control component is in a second phase or the pulse signal is a low-level signal.

[0077] In this technical solution, the state of the control component can also be switched according to the phase of the control component and the pulse signal received by the control component.

[0078] Furthermore, a pulse width modulation (PWM) method is used to send pulse signals to the control unit, the pulse signals including high-level signals and low-level signals.

[0079] Furthermore, the duty cycle of the pulse signal can be a fixed duty cycle, which remains unchanged.

[0080] Furthermore, the duty cycle of the pulse signal can also be a variable duty cycle, which is adjusted in real time according to the voltage across the second capacitor.

[0081] It is understandable that the above motor control method switches the on and off states of the control components based on the phase and pulse signals of the control components.

[0082] Specifically, the above control method switches the state of the control component based on whether the control component is in the first phase or the second phase, and the pulse signal received by the control component. When the control component is in the first phase and the pulse signal is a high-level signal, the control component is switched to the on state; when the control component is in the second phase or the pulse signal is a low-level signal, the control component is switched to the off state.

[0083] 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 bus voltage is less than the first voltage threshold. Alternatively, the control component can be switched to the ON state when the phase of the control component is in the first phase and the pulse signal is a high-level signal, ensuring that the noise suppression circuit can smoothly perform the energy storage process, thereby ensuring that the second capacitor stores sufficient energy.

[0084] When the phase of 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. Alternatively, when the phase of the control component is in the first phase, or the pulse signal is a low-level signal, the control component is switched to the off state. This allows the second capacitor to charge the first capacitor, increasing the minimum voltage across the first capacitor, thereby preventing large torque fluctuations in the motor and effectively reducing motor noise.

[0085] According to a fourth aspect of the present invention, a motor control device is provided for controlling the motor control device proposed in the first aspect of the present invention. The motor control device includes: a processing 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; the processing module is further configured to control the control component to disconnect when the phase of the control component is in a second phase or the bus voltage is greater than a second voltage threshold.

[0086] In this technical solution, the processing module switches the state of the control component based on the phase of the control component and the comparison result between the bus voltage value and the threshold.

[0087] Furthermore, 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.

[0088] Furthermore, the first voltage threshold is the voltage value used to control the turn-on of the control component, and the second voltage threshold is the voltage value used to control the turn-off of the control component.

[0089] It is understandable that the processing module switches the on and off states of the control components based on the phase of the control components and the voltage value of the bus voltage.

[0090] Specifically, the processing module 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.

[0091] In the above technical solution, the processing module is also used to control the bus voltage to stop charging the second capacitor when the control component is in the on state and the voltage of the second capacitor is greater than the bus voltage and the bus voltage is less than or equal to the first voltage threshold.

[0092] In this technical solution, when the control unit and the second control switch to the on state, and the bus voltage between at least two buses begins to charge the second capacitor, the voltage value of the second capacitor is compared with the voltage value of the bus voltage, and the voltage value of the bus voltage is also compared with the first voltage threshold. When the comparison result shows that the voltage value of the second capacitor is greater than the voltage value of the bus voltage, and the voltage value of the bus voltage is less than or equal to the first voltage threshold, the processing module will control the bus voltage to stop charging the second capacitor.

[0093] Specifically, after at least two buses begin charging the second capacitor, the voltage across the second capacitor will continuously increase. The charging process for the second capacitor is determined by detecting the voltage across the second capacitor and the bus voltage. The detected voltage of the second capacitor is compared with the bus voltage, and the bus voltage is also compared with a first voltage threshold. When the voltage of the second capacitor is greater than the bus voltage, and the bus voltage is less than or equal to the first voltage threshold, it indicates that the second capacitor has been fully charged, and the bus voltage will stop charging the second capacitor.

[0094] In this invention, the motor control device determines whether the charging process of the second capacitor is complete by comparing the voltage value of the second capacitor with the voltage value of the bus voltage, and the voltage value of the bus voltage with the first voltage threshold. After the charging process is completed, the charging process is stopped to ensure that the charging process of the second capacitor is completed, while preventing the energy of the second capacitor from being too large and avoiding damage to the motor control device.

[0095] According to a fifth aspect of the present invention, a motor control device is provided for controlling the motor control device proposed in the first aspect of the present invention. The motor control device includes: a receiving module for receiving pulse signals; a processing module for controlling the control component to be turned on when the phase of the control component is in a first phase and the pulse signal is a high-level signal; and the processing module is further configured to control the control component to be turned off when the phase of the control component is in a second phase or the pulse signal is a low-level signal.

[0096] In this technical solution, the processing module can also switch the state of the control component according to the phase of the control component and the pulse signal received by the control component.

[0097] Furthermore, a pulse width modulation (PWM) method is used to send pulse signals to the control unit, the pulse signals including high-level signals and low-level signals.

[0098] Furthermore, the duty cycle of the pulse signal can be a fixed duty cycle, which remains unchanged.

[0099] Furthermore, the duty cycle of the pulse signal can also be a variable duty cycle, which is adjusted in real time according to the voltage across the second capacitor.

[0100] It is understandable that the processing module switches the on and off states of the control components based on the phase and pulse signals of the control components.

[0101] Specifically, the processing module switches the state of the control unit based on whether the control unit is in the first phase or the second phase, and the pulse signal received by the control unit. When the control unit is in the first phase and the pulse signal is high, the control unit is switched to the on state; when the control unit is in the second phase or the pulse signal is low, the control unit is switched to the off state.

[0102] In this invention, when the phase of the control component is in the first phase and the bus voltage is less than the first voltage threshold, the processing module switches the control component to the on state. Alternatively, when the phase of the control component is in the first phase and the pulse signal is a high-level signal, the processing module switches the control component to the on state, ensuring that the noise suppression circuit can successfully perform the energy storage process, thereby ensuring that the second capacitor stores sufficient energy.

[0103] When the phase of the control component is in the second phase, or the bus voltage value is greater than the second voltage threshold, the processing module switches the control component to the off state. Alternatively, when the phase of the control component is in the first phase, or the pulse signal is a low-level signal, the processing module switches the control component to the off state, allowing the second capacitor to charge the first capacitor, increasing the minimum voltage across the first capacitor, thereby preventing large torque fluctuations in the motor and effectively reducing motor noise.

[0104] According to a sixth aspect of the present invention, a motor control device is provided, comprising a memory and a processor. The memory stores a program or instructions, which, when executed by the processor, implement the steps of the motor control method as described in any of the above-described technical solutions. Therefore, this motor control device possesses all the beneficial effects of the motor control method in any of the above-described technical solutions, which will not be elaborated further here.

[0105] According to a seventh aspect of the present invention, a readable storage medium is provided on which a program or instructions are stored, which, when executed by a processor, implement the motor control method as described in any of the above-described technical solutions. Therefore, this readable storage medium possesses all the beneficial effects of the motor control method in any of the above-described technical solutions, which will not be elaborated further here.

[0106] According to an eighth aspect of the present invention, an electric motor is provided, comprising: an electric motor control device as defined in the first aspect above, and / or an electric motor control device as defined in the fourth to sixth aspects above, and / or a readable storage medium as defined in the seventh aspect above, thereby having all the beneficial technical effects of the electric motor control device as defined in the first aspect above, and / or the electric motor control device as defined in the fourth to sixth aspects above, and / or the readable storage medium as defined in the seventh aspect above, which will not be elaborated further here.

[0107] According to a ninth aspect of the present invention, a washing machine is provided that includes all the beneficial technical effects of the motor as defined in the eighth aspect above, which will not be elaborated further here.

[0108] 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

[0109] 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:

[0110] Figure 1 One of the circuit diagrams of the motor control device in the first embodiment of the present invention is shown;

[0111] Figure 2 A second circuit diagram of the motor control device according to the first embodiment of the present invention is shown;

[0112] Figure 3 A third circuit diagram of the motor control device in the first embodiment of the present invention is shown;

[0113] Figure 4 One of the schematic diagrams showing the effect of the motor control device in the first embodiment of the present invention is shown;

[0114] Figure 5 A second schematic diagram illustrating the effect of the motor control device in the first embodiment of the present invention is shown.

[0115] Figure 6 A phase diagram of the motor control device in the first embodiment of the present invention is shown;

[0116] Figure 7 One of the flowcharts of the motor control method in the second embodiment of the present invention is shown;

[0117] Figure 8 A second schematic flowchart of the motor control method according to the second embodiment of the present invention is shown;

[0118] Figure 9The third schematic flowchart of the motor control method in the second embodiment of the present invention is shown;

[0119] Figure 10 One of the structural block diagrams of the motor control device in the third embodiment of the present invention is shown;

[0120] Figure 11 A second structural block diagram of the motor control device according to the third embodiment of the present invention is shown;

[0121] Figure 12 The third structural block diagram of the motor control device in the fourth embodiment of the present invention is shown;

[0122] in, Figures 1 to 3 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0123] 102 First busbar, 103 Second busbar, 104 First capacitor, 106 Noise suppression circuit, 108 Control component, 110 Second capacitor, 112 Rectifier circuit, 114 Inverter circuit, 116 Motor, 118 Power supply, 120 First switch, 122 First diode, 124 First resistor, 126 Second diode, 128 First inductor, 130 Second resistor. Detailed Implementation

[0124] 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 of the present invention and the features thereof can be combined with each other.

[0125] 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.

[0126] The following is combined with Figures 1 to 12 The present application provides a detailed description of the motor control device, motor control method, motor, readable storage medium, and washing machine through specific embodiments and application scenarios.

[0127] Example 1:

[0128] like Figure 1As shown, a motor control device is provided in the first embodiment of the present invention. The motor control device includes: at least two busbars for connecting to a motor 116; a first capacitor 104, the two ends of which are respectively connected to the at least two busbars; and a noise suppression circuit 106, the two ends of which are respectively connected to the at least two busbars. The noise suppression circuit 106 includes a control component 108 and a second capacitor 110. When the control component 108 is in the ON state and the busbar voltage between the at least two busbars is greater than the voltage of the second capacitor 110, the at least two busbars charge the second capacitor 110. When the control component 108 is in the OFF state and the voltage of the second capacitor 110 is greater than the busbar voltage, the second capacitor 110 charges the first capacitor 104.

[0129] In this embodiment, the motor control device internally includes at least two busbars, a first capacitor 104, and a noise suppression circuit 106. The connection method of the above components includes: the at least two busbars may include a positive busbar and a negative busbar, which are respectively connected to the motor 116, and the voltage value of the busbar between the at least two busbars changes over time.

[0130] Furthermore, the first capacitor 104 is connected between at least two busbars and can be a busbar capacitor. Specifically, the first capacitor 104 can be a small-value capacitor used for energy storage and filtering out higher-frequency switching subharmonics.

[0131] Furthermore, the noise suppression circuit 106 includes a control component 108 and a second capacitor 110. The control component 108 has two states: an on state and an off state. Compared with the first capacitor 104, the second capacitor 110 can be a capacitor with a larger capacitance value. The second capacitor 110 with a larger capacitance value is used to store energy and charge the first capacitor 104.

[0132] Furthermore, when the control component 108 in the noise suppression circuit 106 is turned on for the first time, the voltage across the second capacitor 110 in the noise suppression circuit 106 is zero, and the bus voltage will charge the second capacitor 110, and the second capacitor 110 will enter the charging process.

[0133] Specifically, the control unit 108 can switch between an on state and an off state. When the control unit 108 is switched to the on state, it can compare the bus voltage between at least two buses with the voltage across the second capacitor 110. If the bus voltage is less than the voltage across the second capacitor 110, the second capacitor 110 will not be charged. If the bus voltage is greater than the voltage across the second capacitor 110, the bus voltage will begin charging the second capacitor 110. When the control unit is switched to the off state, it can compare the bus voltage between at least two buses with the voltage across the second capacitor 110. If the voltage across the second capacitor 110 is less than the bus voltage, the second capacitor 110 will not discharge the first capacitor 104. Only if the voltage across the second capacitor 110 is greater than the bus voltage will the second capacitor 110 begin charging the first capacitor 104.

[0134] Furthermore, such as Figure 4 The diagram shows the effect of the motor control device, where θ1 is the on-phase of the control component, and V... s V is the voltage value of AC voltage 402 at phase θ1, θ2 is the turn-off phase of the control unit, and V e The AC voltage 402 is the voltage value at phase θ2. When the noise suppression circuit 106 is not connected, the AC voltage 402 is rectified to the bus voltage 404. After the noise suppression circuit 106 is connected and the control component 108 is turned on, if the current bus voltage 404 is greater than the voltage value of the second capacitor 110 in the noise suppression circuit 106, the bus voltage 404 will charge the second capacitor 110. After the control component 108 is turned off, if the voltage value of the second capacitor 110 in the noise suppression circuit 106 is less than or equal to the current bus voltage 404, the second capacitor 110 will not discharge, i.e., the voltage value of the second capacitor 110 will remain unchanged; until the voltage value of the second capacitor 110 is greater than the current bus voltage 404, the second capacitor 110 will charge the first capacitor 104 (with a relatively smaller capacitance value). The voltage change across the second capacitor 110 during the charging and discharging process is shown in curve 408, and the bus voltage at this time is shown in curve 406. The noise suppression circuit 106 ensures that the bus voltage 404 does not drop too low, thereby increasing the minimum value of the bus voltage 404, ultimately solving the noise problem of the motor control system with a small-capacitance bus capacitor, and reducing system vibration to a certain extent.

[0135] For example, a motor control device is used to control a permanent magnet motor. When the permanent magnet motor control system uses a small-capacitance bus capacitor, the small capacitance value of the bus capacitor results in low energy storage. When the load is large, the bus voltage in the motor control device is very likely to drop to a low value or even to zero. In this case, the bus cannot provide the voltage required to control the motor, and the motor will experience large torque fluctuations, which in turn will generate a lot of noise.

[0136] To address the above situation, the motor control device deploys a noise suppression circuit 106. The control component 108 within the noise suppression circuit 106 can be a power switch. The control component 108 has two states: on and off. When the control component 108 is on, it compares the bus voltage value with the voltage value of the second capacitor 110. When the bus voltage value is less than the voltage value across the second capacitor 110, the second capacitor 110 does not charge; when the bus voltage value is greater than the voltage value across the second capacitor 110, the bus voltage begins to charge the second capacitor 110. When the control component 108 is off, it compares the bus voltage value with the voltage value across the second capacitor 110 in real time. When the voltage value across the second capacitor 110 is less than the bus voltage value, the second capacitor 110 does not discharge; when the voltage value across the second capacitor 110 is greater than the bus voltage value, the second capacitor 110 begins to charge the bus capacitor. To ensure the minimum value of the bus capacitance in the circuit, large torque fluctuations in the motor are avoided, thereby reducing the noise generated by the motor.

[0137] It should be noted that if the bus voltage value is less than the turn-on voltage threshold of the control component 108, the control component 108 will be turned on at θ1; if the bus voltage value is greater than or equal to the turn-on voltage threshold of the control component 108, the control component 108 will not be turned on before the next judgment.

[0138] In this embodiment, the motor control device internally deploys at least two buses, a first capacitor 104, and a noise suppression circuit 106. The noise suppression circuit 106 includes a control component and a second capacitor 110. The second capacitor 110 can charge the first capacitor 104 under appropriate conditions, thereby maintaining the voltage across the first capacitor 104 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 motor control devices with small-value bus capacitors and effectively suppresses system vibration caused by insufficient bus voltage to provide the voltage required for motor control.

[0139] In any of the above embodiments, at least two busbars include a first busbar 102 and a second busbar 103.

[0140] In this embodiment, the motor control device is equipped with a first busbar 102 and a second busbar 103, wherein the first busbar 102 is the positive busbar and the second busbar 103 is the negative busbar.

[0141] Furthermore, the noise suppression circuit 106 and the first capacitor 104 are connected between the first bus 102 and the second bus 103 respectively. The bus voltage can charge the second capacitor 110 inside the noise suppression circuit 106 through the first bus 102 and the second bus 103.

[0142] Furthermore, the second capacitor 110 inside the noise suppression circuit 106 can charge the first capacitor 104 through the first bus 102 and the second bus 103.

[0143] Furthermore, the first busbar 102 and the second busbar 103 are respectively connected to the motor 116 and the power supply 118, and the power supply 118 drives the motor to work through the first busbar 102 and the second busbar 103.

[0144] In this embodiment, the motor control device deploys the first bus 102 and the second bus 103 to connect components such as the noise suppression circuit 106, the first capacitor 104, the motor 116, and the power supply 118 in the same circuit. This ensures that the bus voltage can charge the second capacitor 110, thereby ensuring that the second capacitor 110 can charge the first capacitor 104. At the same time, the power supply 118 supplies power to the motor 116 through the first bus 102 and the second bus 103, ensuring the normal operation of the motor 116.

[0145] In any of the above embodiments, the noise suppression circuit 106 further includes: a first diode 122, the cathode of the first diode 122 being connected to the first bus 102; a first terminal of the second capacitor 110 being connected to the anode of the first diode 122; a first terminal of the control component 108 being connected to the second terminal of the second capacitor 110; and a second terminal of the control component 108 being connected to the second bus 103.

[0146] In this embodiment, a first diode 122 is deployed inside the noise suppression circuit 106. The first diode 122 can limit the direction of current flow inside the noise suppression circuit 106. The first diode 122 is connected in series with the second capacitor 110 and the control component 108, and is connected between the first bus 102 and the second capacitor 110.

[0147] Specifically, the cathode of the first diode 122 is connected to the first busbar 102, and the anode of the first diode 122 is connected to the first terminal of the second capacitor 110. The first diode 122, the second capacitor 110, and the control component 108 are connected in series between the first busbar 102 and the second busbar 103.

[0148] Furthermore, based on the unidirectional conductivity of the diode, the current flow direction inside the noise suppression circuit 106 is limited. When the second capacitor 110 is charging, the first diode 122 is in the off state, and current cannot pass through the first diode 122. When the second capacitor 110 is discharging, the first diode 122 is in the on state, and current can flow through the first diode 122.

[0149] It should be noted that when the control component 108 is switched to the off state, the second capacitor 110 can enter the energy discharge process. The second capacitor 110 can charge the first capacitor 104. After the current inside the noise suppression circuit 106 flows out of the second capacitor 110, it flows through the positive terminal and the negative terminal of the first diode 122 in sequence, and finally flows into the first capacitor 104 to complete the charging of the first capacitor 104.

[0150] For example, the first diode 122 can be a parasitic diode, a fast recovery diode, a power diode, etc.

[0151] In this embodiment, the motor control device deploys a first diode 122. Based on the unidirectional conductivity of the diode, it limits the current flow direction of the second capacitor 110 in the noise suppression circuit 106 during the charging and discharging processes. At the same time, during the charging process of the second capacitor 110 to the first capacitor 104, it avoids interference from other voltages to the second capacitor 110, ensuring that the noise suppression circuit 106 completes the charging process of the first capacitor 104, thereby increasing the minimum voltage across the first capacitor 104.

[0152] In any of the above embodiments, the noise suppression circuit 106 further includes: a first resistor 124, the first end of the first resistor 124 being connected to the first bus 102, and the second end of the first resistor 124 being connected to the first end of the second capacitor 110.

[0153] In this embodiment, the noise suppression circuit 106 also includes a first resistor 124, which is a voltage divider resistor that shares the bus voltage between the first bus 102 and the second bus 103. The first resistor 124 is connected in series with the second capacitor 110 and the control component 108, and is connected between the first bus 102 and the second capacitor 110.

[0154] Furthermore, the first resistor 124 is connected in series with the second capacitor 110 and the control component 108. The first resistor 124 can share the bus voltage and prevent a large inrush current from being generated at the moment the second capacitor 110 starts charging, thereby avoiding damage to the second capacitor 110 during the charging process.

[0155] Furthermore, under the same load, the minimum bus voltage is determined by the first resistor 124, the first capacitor 104, and the second phase θ2 in the noise suppression circuit 106; if the second phase is less than or equal to 90°, its maximum voltage does not exceed |V ac sinθ2|; if the second phase is greater than 90°, then its maximum voltage does not exceed V. ac V ac This is the voltage value of the bus voltage.

[0156] Furthermore, the first resistor 124 and the first diode 122 are connected in parallel between the first bus 102 and the second capacitor 110.

[0157] It should be noted that when the control component 108 is switched to the on state, the second capacitor 110 can enter the charging process. The current inside the noise suppression circuit 106 first flows through the first resistor 124 and then into the second capacitor 110. When the control component 108 is switched to the off state, the second capacitor 110 can enter the discharging process. The current inside the noise suppression circuit 106 flows out of the second capacitor 110, then flows through the positive and negative terminals of the first diode 122, and finally flows into the first capacitor 104.

[0158] For example, the motor control device includes a noise suppression circuit 106, which internally houses a control component 108, a second capacitor 110, and a first resistor 124. When the control component 108 first switches to the on state, the voltage across the second capacitor 110 is zero, and the bus voltage begins to charge the second capacitor. At this time, the inrush current of the second capacitor is:

[0159]

[0160] Among them, V dc R is the voltage value of the bus voltage at the moment of turn-on, and R is the resistance value of the first resistor.

[0161] For example, the motor control device includes a noise suppression circuit 116, which internally houses a control component 108, a second capacitor 110, and a first resistor 124, and sets a voltage threshold. When the control component 108 is switched to the on state, the voltage across the second capacitor 110 is greater than the bus voltage in the circuit, and when the bus voltage is less than the voltage threshold, the second capacitor 110 has sufficient energy, and the bus voltage will not charge the second capacitor 110.

[0162] For example, the motor control device includes a noise suppression circuit, which internally houses a control component 108, a second capacitor 110, and a first resistor 124, and sets a voltage threshold. When the control component 108 is switched to the on state, the voltage across the second capacitor 110 is less than the bus voltage in the circuit, and the bus charges the second capacitor 110. At this time, the inrush current of the second capacitor is:

[0163]

[0164] Among them, V dc V is the voltage value of the bus voltage at the moment of switching on. c R is the voltage across the second capacitor, and R is the resistance of the first resistor. Because the bus voltage and the voltage across the second capacitor are approximately equal at this point, the inrush current is very small.

[0165] In this embodiment, the motor control device deploys a first resistor 124 and connects it in series with the second capacitor 110 to share the bus voltage, thereby limiting the voltage across the second capacitor 110 during charging or discharging, reducing the instantaneous inrush current generated when the second capacitor 110 is charging, and ensuring the charging and discharging safety of the noise suppression circuit 106.

[0166] like Figure 2 As shown, in any of the above embodiments, the noise suppression circuit 106 further includes: a first inductor 128, the first end of the first inductor 128 being connected to the first bus 102, and the second end of the first resistor 124 being connected to the first end of the second capacitor 110.

[0167] In this embodiment, a first inductor 128 is also deployed inside the noise suppression circuit 106. The first inductor 128 is a blocking inductor that blocks the alternating current inside the noise suppression circuit 106. The first inductor 128 is connected in series with the second capacitor 110 and the control component 108, and is connected between the first bus 102 and the second capacitor 110.

[0168] Furthermore, the first inductor 128 is connected in series with the second capacitor 110 and the control component 108. According to the characteristics of the inductor, the first inductor 128 can block the AC current flowing into the second capacitor 110, and prevent the AC current from interfering with the charging process of the second capacitor 110.

[0169] Furthermore, under the same load, the minimum bus voltage is determined by the first inductor 128, the first capacitor 104, and the second phase θ2 in the noise suppression circuit 106; if the second phase is less than or equal to 90°, its maximum voltage does not exceed |V ac sinθ2|; if the second phase is greater than 90°, then its maximum voltage does not exceed V. ac Vac This is the voltage value of the bus voltage.

[0170] Furthermore, the first inductor 128 and the first diode 122 are connected in parallel between the first bus 102 and the second capacitor 110.

[0171] It should be noted that when the control component 108 is switched to the on state, the second capacitor 110 can enter the charging process. The current inside the noise suppression circuit 106 first flows through the first inductor 128 and then into the second capacitor 110. When the control component 108 is switched to the off state, the second capacitor 110 can enter the discharging process. The current inside the noise suppression circuit 106 flows out of the second capacitor 110, then flows through the positive and negative terminals of the first diode 122, and finally flows into the first capacitor 104.

[0172] In this embodiment, the motor control device deploys a first inductor 128 and connects it in series with a second capacitor 110 to block the AC current flowing into the second capacitor 110, preventing the AC current from interfering with the charging process of the second capacitor 110, ensuring the stability of the noise suppression circuit 106, and thus ensuring the effect of the noise suppression circuit 106 in reducing the noise of the motor system.

[0173] like Figure 3 As shown, in any of the above embodiments, the noise suppression circuit 106 further includes: a second resistor 130, the first end of the second resistor 130 being connected to the anode of the first diode 122, and the second end of the second resistor 130 being connected to the first end of the second capacitor 110.

[0174] In this embodiment, the noise suppression circuit 106 also includes a second resistor 130, which is a voltage divider resistor. The second resistor 130 is connected in series with the first diode 122, the second capacitor 110, and the control component 108, and is connected between the first bus 102 and the second capacitor 110.

[0175] Furthermore, the second resistor 130 is connected in series with the first diode 122. During the charging process of the second capacitor 110 to the first capacitor 104, the second resistor 130 can share the voltage of the first capacitor 104 and limit the voltage value across the first capacitor 104, thereby preventing the first capacitor 104 from being damaged during the charging process.

[0176] Furthermore, the second resistor 130 and the first diode 122 are connected in series, and then connected in parallel with the first inductor 128 between the first bus 102 and the second capacitor 110.

[0177] It should be noted that when the control component 108 is switched to the on state, the second capacitor 110 can enter the charging process. The current inside the noise suppression circuit 106 first flows through the first inductor 128 and then into the second capacitor 110. When the control component 108 is switched to the off state, the second capacitor 110 can enter the discharging process. After the current inside the noise suppression circuit 106 flows out of the second capacitor 110, it first passes through the second resistor 130, then through the positive and negative terminals of the first diode 122, and finally flows into the first capacitor 104.

[0178] In this embodiment, the motor control device deploys a second resistor 130 to share the voltage of the first capacitor 104 during the charging process of the second capacitor 110 inside the noise suppression circuit 106, thereby limiting the voltage value across the first capacitor 104. This prevents the first capacitor 104 from being damaged during the charging process, improves the safety of the noise suppression circuit 106, and prevents the noise suppression circuit 106 from damaging other components.

[0179] In any of the above embodiments, the control component 108 includes: a first switch 120, the first end of the first switch 120 being connected to the second end of the second capacitor 110, and the second end of the first switch 120 being connected to the second bus 103; and a second diode 126, the cathode of the second diode being connected to the second end of the second capacitor 110, and the cathode of the second diode being connected to the second bus 103.

[0180] In this embodiment, the control component 108 consists of a first switch 120 and a second diode 126, with the first switch 120 and the second diode 126 connected in parallel.

[0181] Specifically, the first switch 120 and the second diode 126 inside the control component 108 are connected in parallel. When the first switch 120 is turned on, the second diode 126 is short-circuited by the first switch 120, and the control component 108 is in the on state. When the first switch 120 is turned off, the first switch 120 is in the open circuit state, the second diode 126 is in the normal state, and the control component 108 is in the off state.

[0182] Furthermore, the anode of the second diode 126 is connected to the second bus 103, and the cathode of the second diode 126 is connected to the second terminal of the second capacitor 110. When the current flows from the positive terminal to the negative terminal, the second diode 126 is in the conducting state; when the current flows from the positive terminal to the negative terminal, the second diode 126 is in the off state.

[0183] It should be noted that when the second capacitor 110 is in the discharge process, the current in the noise suppression circuit 106 flows through the second diode 126 from the positive terminal of the second diode 126 to the negative terminal of the second diode 126; when the second capacitor 110 is in the charging process, the current in the noise suppression circuit 106 flows through the first switch 120 and finally into the second capacitor 110.

[0184] For example, the first switch 120 can be of the type of MOSFET, IGBT, etc.

[0185] For example, the second diode 126 can be a parasitic diode, a fast recovery diode, a power diode, etc.

[0186] In this embodiment, the motor control device comprises a control component 108 consisting of a first switch 120 and a second diode 126. The state of the control component 108 is switched by changing the switching state of the first switch 120. When the first switch 120 is on, the control component 108 is in the ON state, allowing the second capacitor 110 to be charged using the bus voltage, ensuring the voltage across the second capacitor 110 and thus ensuring that the second capacitor 110 stores sufficient energy. When the first switch 120 is off, the control component 108 is in the OFF state, allowing the first capacitor 104 to be charged using the second capacitor 110, ensuring the voltage across the first capacitor 104 and thus ensuring that the bus provides the voltage required for the normal operation of the motor 116.

[0187] In any of the above embodiments, the capacitance of the second capacitor 110 is greater than the capacitance of the first capacitor 104.

[0188] In this embodiment, the first capacitor 104 is a small-value capacitor, and the second capacitor 110 is an energy storage capacitor inside the noise suppression circuit 106. The second capacitor 110 is a large-value capacitor relative to the first capacitor 104.

[0189] In this embodiment, the motor control device deploys a second capacitor 110 with a large capacitance value to ensure that the noise suppression circuit 106 can store enough energy to charge the first capacitor 104, thereby ensuring the voltage value across the first capacitor 104. By deploying a first capacitor 104 with a small capacitance value, higher frequency switching subharmonics that occur inside the motor control device can be filtered out.

[0190] In any of the above embodiments, the motor control device further includes: a rectifier circuit 112, which is connected to the power supply 118 and at least two buses respectively, to convert the AC voltage output by the power supply 118 into DC voltage to supply power to the at least two buses; and an inverter circuit 114, which is connected to the at least two buses and the motor 116 respectively, to convert the DC voltage on the at least two buses into AC voltage to control the operating state of the motor 116 connected to the inverter module.

[0191] In this embodiment, the motor control device is equipped with a rectifier circuit 112 and an inverter circuit 114. The rectifier circuit 112 is connected between the busbars and is connected to the power supply 118, thereby converting the AC power output by the power supply 118 into DC power, which is then transmitted to the motor through the busbars.

[0192] Specifically, the inverter circuit 114 is connected between the busbars. The inverter circuit 114 converts the DC power output by the rectifier circuit 112 into AC power to drive the motor 116.

[0193] Specifically, the first capacitor 104 and the noise suppression circuit 106 are respectively disposed between the rectifier circuit 112 and the inverter circuit 114.

[0194] In this embodiment, the motor control device converts the AC voltage output from the power supply 118 into DC voltage through the rectifier circuit 112, which can then charge the second capacitor 110 of the noise suppression circuit 106 and facilitate the control of the motor 116. At the same time, the inverter circuit 114 converts the DC voltage into AC voltage and outputs it to the motor 116 to drive the motor 116 and ensure the normal operation of the motor 116.

[0195] Example 2:

[0196] like Figure 7 As shown, a second aspect of the present invention provides one method for controlling a motor, used to control the motor control device proposed in the first aspect of the present invention. The motor control method includes:

[0197] Step 702: 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 turned on.

[0198] Step 704: When the phase of the control component is in the second phase, or when the bus voltage is greater than the second voltage threshold, the control component is disconnected.

[0199] In this embodiment, the control component is switched in state based on the phase of the control component and the comparison result between the bus voltage value and the threshold.

[0200] Furthermore, 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.

[0201] Furthermore, 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.

[0202] It is understandable that the above motor control method switches the on and off states of the control components based on the phase of the control components and the voltage value of the bus voltage.

[0203] Specifically, 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.

[0204] Furthermore, such as Figure 4 The diagram shows the relationship between the phase of the AC voltage and the phase of the control component 108 in the motor control device. The phase of the AC voltage ranges from 0 to 360 degrees, and the phases of the first control component and the second control component range from 0 to 180 degrees.

[0205] Furthermore, the first phase is defined as follows:

[0206] -V dc_val ≤V ac sinθ1≤V dc_val ;

[0207] Where θ1 is the first phase, V ac The voltage value of the bus voltage, V dc_val This is the first voltage threshold.

[0208] Furthermore, the second phase is further defined, and the phase relationship between the first phase and the second phase is as follows:

[0209] |V ac sinθ1|≤|V ac sinθ2|;

[0210] Where θ1 is the first phase, θ2 is the second phase, and V ac This is the voltage value of the bus voltage.

[0211] Furthermore, the second voltage threshold is defined, and the voltage value range of the second voltage threshold is as follows:

[0212] V e >V s ;

[0213] Among them, V e The second voltage threshold, V s The bus voltage when the phase of the control component is in the first phase.

[0214] 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, thereby ensuring that the noise suppression circuit can successfully carry out the energy storage process and thus ensuring that the second capacitor stores enough energy.

[0215] 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.

[0216] like Figure 8 As shown, in one of the above-mentioned motor control methods, the motor control method further includes:

[0217] Step 802: 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 turned on.

[0218] Step 804: When the control unit is in the on state, and the voltage of the second capacitor is greater than the bus voltage and the bus voltage is less than or equal to the first voltage threshold, control the bus voltage to stop charging the second capacitor.

[0219] Step 806: When the phase of the control component is in the second phase, or when the bus voltage is greater than the second voltage threshold, the control component is disconnected.

[0220] In this embodiment, when the control unit and the second control are switched to the on state, and the bus voltage between at least two buses begins to charge the second capacitor, the voltage value of the second capacitor is compared with the voltage value of the bus voltage, and the voltage value of the bus voltage is also compared with a first voltage threshold. When the comparison result shows that the voltage value of the second capacitor is greater than the voltage value of the bus voltage, and the voltage value of the bus voltage is less than or equal to the first voltage threshold, the bus voltage will stop charging the second capacitor.

[0221] Specifically, after at least two buses begin charging the second capacitor, the voltage across the second capacitor will continuously increase. The charging process for the second capacitor is determined by detecting the voltage across the second capacitor and the bus voltage. The detected voltage of the second capacitor is compared with the bus voltage, and the bus voltage is also compared with a first voltage threshold. When the voltage of the second capacitor is greater than the bus voltage, and the bus voltage is less than or equal to the first voltage threshold, it indicates that the second capacitor has been fully charged, and the bus voltage will stop charging the second capacitor.

[0222] In this embodiment, the motor control method determines whether the charging process of the second capacitor is complete by comparing the voltage value of the second capacitor with the voltage value of the bus voltage, and the voltage value of the bus voltage with a first voltage threshold. The charging process is stopped upon completion. This ensures the completion of the charging process for the second capacitor while preventing excessive energy in the second capacitor, thus avoiding damage to the motor control device.

[0223] like Figure 9 As shown, a third aspect of the present invention also provides a second motor control method for controlling the motor control device proposed in the first aspect of the present invention, the motor control method comprising:

[0224] Step 902: Receive pulse signal;

[0225] Step 904: When the phase of the control component is in the first phase and the pulse signal is a high-level signal, the control component is turned on.

[0226] Step 906: When the phase of the control component is in the second phase, or when the pulse signal is a low-level signal, the control component is disconnected.

[0227] In this embodiment, the state of the control component can also be switched according to the phase of the control component and the pulse signal received by the control component.

[0228] Furthermore, a pulse width modulation (PWM) method is used to send pulse signals to the control unit, the pulse signals including high-level signals and low-level signals.

[0229] Furthermore, the duty cycle of the pulse signal can be a fixed duty cycle, which remains unchanged.

[0230] Furthermore, the duty cycle of the pulse signal can also be a variable duty cycle, which is adjusted in real time according to the voltage across the second capacitor.

[0231] Furthermore, such as Figure 6The diagram shows the relationship between the phase of the AC voltage and the phase of the control components in the motor control device. The AC voltage phase ranges from 0 to 360 degrees, and the phase ranges of the first and second control components range from 0 to 180 degrees.

[0232] Furthermore, such as Figure 5 The diagram shows the effect of the motor control device. θ1 is the on-phase of the first control component, and θ2 is the off-phase of the first control component. Without the noise suppression circuit connected, the AC voltage 502 is rectified to the bus voltage 504. After the noise suppression circuit is connected, the bus voltage is as shown in curve 506. The voltage change across the second capacitor during charging and discharging is shown in curve 508. During charging, the voltage across the second capacitor rises when the pulse signal is high, rises when the pulse signal is both high and low, and falls when the pulse signal is high. The noise suppression circuit ensures that the bus voltage 504 does not drop too low, thus raising the minimum value of the bus voltage 504 and ultimately solving the noise problem of the motor control system with a small-value bus capacitor. It also reduces system vibration to some extent.

[0233] It is understandable that the above motor control method switches the on and off states of the control components based on the phase and pulse signals of the control components.

[0234] Specifically, the above control method switches the state of the control component based on whether the control component is in the first phase or the second phase, and the pulse signal received by the control component. When the control component is in the first phase and the pulse signal is a high-level signal, the control component is switched to the on state; when the control component is in the second phase or the pulse signal is a low-level signal, the control component is switched to the off state.

[0235] In this embodiment, the motor control method switches the control component to the ON state when the control component's phase is in the first phase and the pulse signal is a high-level signal. This ensures that the noise suppression circuit can smoothly perform the energy storage process, thereby ensuring that the second capacitor stores sufficient energy. When the control component's phase is in the first phase or the pulse signal is a low-level signal, the control component switches to the OFF state, allowing the second capacitor to charge the first capacitor. This increases the minimum voltage across the first capacitor, thereby preventing large torque fluctuations in the motor and effectively reducing motor noise.

[0236] Example 3:

[0237] like Figure 10As shown, a fourth aspect of the present invention provides a motor control device 1000 for controlling the motor control device proposed in the first aspect of the present invention, the motor control device comprising:

[0238] The processing module 1002 is used to control the control component to conduct when the phase of the control component is in the first phase and the bus voltage is less than the first voltage threshold.

[0239] The processing module 1002 is also used to control the control component to disconnect when the phase of the control component is in the second phase or the bus voltage is greater than the second voltage threshold.

[0240] In this embodiment, the processing module switches the state of the control component based on the phase of the control component and the comparison result between the bus voltage value and the threshold.

[0241] Furthermore, 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.

[0242] Furthermore, the first voltage threshold is the voltage value used to control the turn-on of the control component, and the second voltage threshold is the voltage value used to control the turn-off of the control component.

[0243] It is understandable that the processing module switches the on and off states of the control components based on the phase of the control components and the voltage value of the bus voltage.

[0244] Specifically, the processing module 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.

[0245] In this embodiment, when the phase of the control component is equal to the first phase and the bus voltage is less than the first voltage threshold, the processing module switches the control component to the on state and works together with the resistor component to limit the charging voltage of the second capacitor in the noise suppression circuit during the charging process, ensuring that the noise suppression circuit can smoothly carry out the energy storage process and improving the stability of the charging process of the second capacitor.

[0246] When the phase of the control unit is in the second phase, or when the bus voltage value is greater than the second voltage threshold, the processing module switches the control unit 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.

[0247] Furthermore, the processing module 1002 in the aforementioned motor control device is also used to control the bus voltage to stop charging the second capacitor when the control component is in the on state and the voltage of the second capacitor is greater than the bus voltage and the bus voltage is less than or equal to the first voltage threshold.

[0248] In this embodiment, the motor control device compares the voltage value of the second capacitor with the voltage value of the bus voltage, and the voltage value of the bus voltage with the first voltage threshold, through a processing module to determine whether the charging process of the second capacitor is complete, and stops the charging process after the charging is complete. This ensures that the charging process of the second capacitor is completed, while preventing the energy of the second capacitor from becoming too large, thus avoiding damage to the motor control device.

[0249] like Figure 11 As shown, a fifth aspect of the present invention provides a motor control device 1100 for controlling the motor control device proposed in the first aspect of the present invention, the motor control device comprising:

[0250] In any of the above embodiments, the motor control device 1100 includes:

[0251] Receiver module 1102 is used to receive pulse signals;

[0252] The processing module 1104 is used to control the control component to be turned on when the phase of the control component is in the first phase and the pulse signal is a high-level signal; and to control the control component to be turned off when the phase of the control component is in the second phase or the pulse signal is a low-level signal.

[0253] In this embodiment, the processing module switches the state of the control component according to the phase of the control component and the pulse signal received by the control component.

[0254] Furthermore, a pulse width modulation (PWM) method is used to send pulse signals to the control unit, the pulse signals including high-level signals and low-level signals.

[0255] Furthermore, the duty cycle of the pulse signal can be a fixed duty cycle, which remains unchanged.

[0256] Furthermore, the duty cycle of the pulse signal can also be a variable duty cycle, which is adjusted in real time according to the voltage across the second capacitor.

[0257] It is understandable that the processing module switches the on and off states of the control components based on the phase and pulse signals of the control components.

[0258] Specifically, the processing module switches the state of the control unit based on whether the control unit is in the first phase or the second phase, and the pulse signal received by the control unit. When the control unit is in the first phase and the pulse signal is high, the control unit is switched to the on state; when the control unit is in the second phase or the pulse signal is low, the control unit is switched to the off state.

[0259] In this embodiment, when the phase of the control component is in the first phase and the pulse signal is a high-level signal, the processing module switches the control component to the on state, ensuring that the noise suppression circuit can smoothly carry out the energy storage process, thereby ensuring that the second capacitor stores sufficient energy. When the phase of the control component is in the first phase or the pulse signal is a low-level signal, the control component is switched to the off state, thus switching the control component to the on state. The processing module enables the second capacitor to charge the first capacitor, increasing the minimum voltage across the first capacitor, thereby avoiding large torque fluctuations in the motor and effectively reducing motor noise.

[0260] Example 4:

[0261] like Figure 12 As shown, a sixth aspect of the present invention provides a motor control device 1200, including a memory 1202 and a processor 1204. The memory 1202 stores a program or instructions, which, when executed by the processor 1204, implement the steps of the motor control method provided in the second or third aspect described above. Therefore, this motor control device possesses all the beneficial effects of the motor control method provided in the second or third aspect described above, which will not be elaborated further here.

[0262] Example 5:

[0263] A seventh aspect of the present invention provides a readable storage medium having a program stored thereon, which, when executed by a processor, implements the motor control method as provided in the second or third aspect above, and thus has all the beneficial technical effects of the motor control method provided in the second or third aspect above.

[0264] Among them, readable storage media include read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0265] Example 6:

[0266] An eighth aspect of the present invention provides an electric motor comprising: a motor control device as provided in the first aspect above, and / or a motor control device as provided in the fourth to sixth aspects above, and / or a readable storage medium as provided in the seventh aspect above, thereby having all the beneficial technical effects of the motor control device as provided in the first aspect above, and / or the motor control device as provided in the fourth to sixth aspects above, and / or the readable storage medium as provided in the seventh aspect above, which will not be elaborated further here.

[0267] Example 7:

[0268] The ninth aspect of the present invention provides a washing machine, including: all the beneficial technical effects of the motor provided in the eighth aspect above, which will not be elaborated further here.

[0269] It should be clarified that in the claims, description, and accompanying drawings of this invention, the term "plural" refers to two or more. Unless otherwise explicitly defined, the terms "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description process, not to indicate or imply that the device or element referred to must have the described specific orientation, or be constructed and operated in a specific orientation. Therefore, these descriptions should not be construed as limiting the invention. The terms "connection," "installation," "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection between multiple objects, 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 skilled in the art, the specific meaning of the above terms in this invention can be understood based on the specific circumstances of the above data.

[0270] In the claims, description, and accompanying drawings of this invention, 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 invention. In the claims, description, and accompanying drawings of this invention, 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.

[0271] The above are merely preferred embodiments of the present invention and are not intended to limit the present 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. An electric motor control device characterized by comprising: The motor control device is used for controlling a motor, and the motor control device comprises: at least two bus bars, including a first bus bar and a second bus bar, the at least two bus bars being used for being connected with the motor; a first capacitor, two ends of the first capacitor being connected with the at least two bus bars respectively; a noise suppression circuit, two ends of the noise suppression circuit being connected with the at least two bus bars respectively, the noise suppression circuit comprising a control component and a second capacitor; wherein, in a case that the control component is in an on state, and a bus voltage between the at least two bus bars is greater than a voltage of the second capacitor, the at least two bus bars charge the second capacitor; in a case that the control component is in an off state, and the voltage of the second capacitor is greater than the bus voltage, the second capacitor charges the first capacitor; the noise suppression circuit further comprises: a first diode, a cathode of the first diode being connected with the first bus bar; a first end of the second capacitor being connected with an anode of the first diode; a first end of the control component being connected with a second end of the second capacitor, and a second end of the control component being connected with the second bus bar; the noise suppression circuit further comprises: a first resistor, a first end of the first resistor being connected with the first bus bar, and a second end of the first resistor being connected with the first end of the second capacitor; wherein, when the second capacitor is in a charging process, the first diode is in an off state, and when the second capacitor is in a discharging process, the first diode is in an on state.

2. An electric motor control device characterized by comprising: The motor control device is used for controlling a motor, and the motor control device comprises: at least two bus bars, including a first bus bar and a second bus bar, the at least two bus bars being used for being connected with the motor; a first capacitor, two ends of the first capacitor being connected with the at least two bus bars respectively; a noise suppression circuit, two ends of the noise suppression circuit being connected with the at least two bus bars respectively, the noise suppression circuit comprising a control component and a second capacitor; wherein, in a case that the control component is in an on state, and a bus voltage between the at least two bus bars is greater than a voltage of the second capacitor, the at least two bus bars charge the second capacitor; in a case that the control component is in an off state, and the voltage of the second capacitor is greater than the bus voltage, the second capacitor charges the first capacitor; the noise suppression circuit further comprises: a first diode, a cathode of the first diode being connected with the first bus bar; a first end of the second capacitor being connected with an anode of the first diode; a first end of the control component being connected with a second end of the second capacitor, and a second end of the control component being connected with the second bus bar; the noise suppression circuit further comprises: a first inductor, a first end of the first inductor being connected with the first bus bar, and a second end of the first inductor being connected with the first end of the second capacitor; The first diode is in an off state when the second capacitor is in a charging process, and the first diode is in a conductive state when the second capacitor is in a discharging process.

3. The motor control device according to claim 2, characterized by The noise suppression circuit further comprises: The second resistor has a first end connected to the anode of the first diode and a second end connected to the first end of the second capacitor.

4. The motor control device according to any one of claims 1 to 3, characterized by The control component comprises: The first switch has a first end connected to the second end of the second capacitor and a second end connected to the second bus; The second diode has a cathode connected to the second end of the second capacitor and an anode connected to the second bus.

5. The motor control device according to any one of claims 1 to 3, wherein The capacitance of the second capacitor is greater than the capacitance of the first capacitor.

6. The motor control device according to any one of claims 1 to 3, characterized by The motor control device further comprises: The rectifier circuit is connected to a power supply and the at least two buses to convert alternating voltage output by the power supply into direct current voltage to power the at least two buses; The inverter circuit is connected to the at least two buses and the motor to convert direct current voltage on the at least two buses into alternating voltage to control the working state of the motor connected to the inverter circuit.

7. The motor control device according to any one of claims 1 to 3, characterized by The motor control device further comprises: The processing module controls the control component to be conductive when the phase of the control component is in a first phase and the bus voltage is less than a first voltage threshold. The processing module controls the control component to be off when the phase of the control component is in a second phase or the bus voltage is greater than a second voltage threshold.

8. The motor control device according to any one of claims 1 to 3, characterized by The motor control device further comprises: The processing module receives a pulse signal. The processing module controls the control component to be conductive when the phase of the control component is in a first phase and the pulse signal is a high-level signal. The processing module controls the control component to be off when the phase of the control component is in a second phase or the pulse signal is a low-level signal.

9. A method of controlling an electric machine, characterized by The motor control method for the motor control device of any one of claims 1 to 8 comprises: controlling the control component to be conductive when the phase of the control component is in a first phase and the bus voltage is less than a first voltage threshold, and controlling the control component to be off when the phase of the control component is in a second phase or the bus voltage is greater than a second voltage threshold.

10. The motor control method according to claim 9, characterized by, The motor control method further comprises: controlling the bus voltage to stop charging the second capacitor when the control component is in an on state, the voltage of the second capacitor is greater than the bus voltage, and the bus voltage is less than or equal to the first voltage threshold.

11. A method of controlling an electric machine, characterized by The motor control method for the motor control device of any one of claims 1 to 8 comprises: receiving a pulse signal; In a case where the phase of the control component is in a first phase and the pulse signal is a high level signal, the control component is controlled to be turned on; in a case where the phase of the control component is in a second phase or the pulse signal is a low level signal, the control component is controlled to be turned off.

12. An electric motor control device characterized by comprising: The motor control device comprises: A memory and a processor, the memory stores a program, and the processor implements the steps of the motor control method according to any one of claims 9 to 11 when executing the program.

13. A readable storage medium, characterized by, The program or instruction stored on the readable storage medium is executed by the processor to implement the steps of the motor control method according to any one of claims 9 to 11.

14. An electric machine characterized by The motor control device comprises: The motor control device according to any one of claims 1 to 8; And / or, The readable storage medium according to claim 13.

15. A laundry washing machine characterized in that, The motor comprises: The motor according to claim 14.

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