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

Abstract

The present invention provides 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, the at least two busbars being connected to the motor; a first capacitor, the two ends of the first capacitor being respectively connected to the at least two busbars; a noise suppression circuit, the noise suppression circuit including a first branch and a second branch respectively connected to the at least two busbars, the first branch including a first control component and a second capacitor, the second branch including a resistor component, and the resistor component being capable of charging and voltage dividing the second capacitor; when the first control component is in an on state and the bus 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 first 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.

Description

Technical Field

[0001] The present invention relates to the technical field of motor control, and in particular to a motor control device, a motor control method, a motor, a readable storage medium, and a washing machine. Background Art

[0002] Permanent magnet synchronous motors are widely used in aerospace, new energy, home appliances and other fields due to their advantages in torque density, efficiency and reliability. The permanent magnet synchronous motor control system with small-capacitance bus capacitor can improve the system power factor and reduce the system harmonics through control strategies. On the one hand, it can eliminate the inductor used to reduce the harmonic content in the existing technology. On the other hand, it can greatly reduce the capacitance of the bus capacitor and reduce the system cost.

[0003] However, in a permanent magnet synchronous motor control system with a small-capacitance bus capacitor, the energy that can be stored by the small-capacitance bus capacitor is relatively low. When the system load is heavy, the bus voltage can easily drop to a low value or even 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 the permanent magnet synchronous motor control system is also prone to large vibration and noise. 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] To this end, a first aspect of the present invention is to provide a motor control device.

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

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

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

[0009] A fifth aspect of the present invention is to provide a readable storage medium.

[0010] A sixth aspect of the present invention is to provide a motor.

[0011] A seventh aspect of the present invention is to provide a washing machine.

[0012] In view of this, according to a first aspect of the present invention, a motor control device is proposed, which is used to control a motor, and the motor control device includes: at least two busbars, at least two busbars are used to be connected to the motor; a first capacitor, two ends of the first capacitor are respectively connected to the at least two busbars; a noise suppression circuit, the noise suppression circuit includes a first branch and a second branch respectively connected to the at least two busbars, the first branch includes a first control component and a second capacitor, and the second branch includes a resistor component, which can divide the voltage of the second capacitor; wherein, when the first control component is in an on state and the bus voltage between the at least two busbars is greater than the voltage of the second capacitor, the at least two busbars can charge the second capacitor; when the first 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.

[0013] In this technical solution, the motor control device comprises at least two busbars, a first capacitor, and a noise suppression circuit. The aforementioned components are connected in such a manner that the at least two busbars include a positive busbar and a negative busbar, each connected to the motor, and the busbar voltage between the at least two busbars varies over time.

[0014] Furthermore, the first capacitor is connected between at least two busbars and may be a busbar capacitor. Specifically, the first capacitor may be a small-capacitance capacitor for energy storage and filtering higher-frequency switching subharmonics.

[0015] Furthermore, the above-mentioned noise suppression circuit includes two branches, a first branch and a second branch, wherein the first branch includes a first control component and a second capacitor, the first control component has two states: an on state and an off state, and the second capacitor can be a capacitor with a larger capacitance value, and the second capacitor with a larger capacitance value is used to store energy and charge the first capacitor.

[0016] Furthermore, the second branch includes a resistance component, which may be composed of at least one resistor, and the resistance component may be used to share the bus voltage between at least two busbars.

[0017] It can be understood that when the first 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. Therefore, providing a resistor component in the second branch can reduce the inrush current when charging the second capacitor, thereby protecting the reliability of the second capacitor in the noise suppression circuit.

[0018] Specifically, the above-mentioned first control component can be switched between an on state and an off state. When the first control component is switched to the on state, the voltage value of the bus voltage between at least two busbars and the voltage value at both ends of the second capacitor can be compared. When the voltage value of the bus voltage is less than the voltage value at both ends of the second capacitor, the second capacitor will not be charged; when the voltage value of the bus voltage is greater than the voltage value at both ends of the second capacitor, the bus voltage starts to charge the second capacitor. When the first control component is switched to the off state, the voltage value of the bus voltage between at least two busbars and the voltage value at both ends of the second capacitor can be compared. When the voltage value at both ends of the second capacitor is less than the voltage value of the bus voltage, the second capacitor does not need to discharge the energy of the first capacitor, and when the voltage value at both ends of the second capacitor is greater than the voltage value of the bus voltage, the above-mentioned second capacitor starts to charge the first capacitor.

[0019] The motor control device of the present invention is internally deployed with at least two busbars, a first capacitor and a noise suppression circuit. The noise suppression circuit includes a first branch and a second branch. The busbar voltage can charge the first capacitor through the first branch in the noise suppression circuit under appropriate circumstances, thereby maintaining the voltage across the first capacitor, ensuring that the busbar provides the voltage required to control the normal operation of the motor, and avoiding large torque fluctuations in the motor. The second branch in the noise suppression circuit can protect the second capacitor when the busbar voltage charges the second capacitor of the first branch, effectively limiting the impact current of the second capacitor, thereby improving the reliability of the noise suppression circuit. The noise suppression circuit can solve the noise problem that occurs in motor control devices with small-capacity busbar capacitors, and can effectively suppress the system vibration problem caused by the motor control system being insufficient for the busbar voltage to provide the voltage required to control the motor.

[0020] The motor control device according to the present invention may also have the following additional technical features:

[0021] In the above technical solution, the first end of the above-mentioned resistor assembly is connected to the first busbar among the at least two busbars, and the above-mentioned second branch also includes: a second control component, the first end of the second control component is connected to the resistor assembly, and the second end of the second control component is connected to the second busbar among the at least two busbars; wherein, the second control component can be in the open state or the closed state at the same time as the first control component.

[0022] In this technical solution, at least two busbars include a first busbar and a second busbar. The first busbar is a positive busbar connected to the positive pole of the power supply, and the second busbar is a negative busbar connected to the negative pole of the power supply.

[0023] Furthermore, the second branch further includes a second control component, which is connected in series with the resistor assembly and connected between the first busbar and the second busbar.

[0024] Specifically, the first control component and the second control component can be connected in parallel, and both have two states: an on state and an off state. The first control component and the second control component can be set so that the first control component and the second control component maintain a synchronized state, that is, synchronously opened or synchronously disconnected.

[0025] It should be noted that when the first control component and the second control component are synchronously closed, the current inside the noise suppression circuit can flow from the first bus to the second bus. When the voltage value of the bus voltage is greater than the voltage value across the second capacitor, the second capacitor can enter the charging process, and the bus voltage charges the second capacitor. After the first control component and the second control component are synchronously disconnected, the current inside the noise suppression circuit can flow from the second bus to the first bus, the second capacitor can enter the discharge process, and the second capacitor charges the first capacitor. In the present invention, the motor control device ensures that the noise suppression circuit can operate normally and reduces the noise of the motor system by separately deploying the first control component and the second control component.

[0026] In the above technical solution, the resistor assembly includes: a first resistor, a first end of the first resistor is connected to the first bus; a second resistor, a first end of the second resistor is connected to the second end of the first resistor, and the second end of the second resistor is connected to the second control component.

[0027] In this technical solution, the resistor component is composed of two resistors, a first resistor and a second resistor, connected in series.

[0028] Specifically, the first resistor, the second resistor and the second control component may be connected in series and connected between the first bus and the second bus to together constitute the second branch of the noise suppression circuit.

[0029] Furthermore, the combination of the first resistor and the second resistor can share the bus voltage, thereby preventing a large inrush current from being generated at the moment the second capacitor starts to be charged, thereby avoiding damage to the second capacitor during the charging process.

[0030] In the present invention, the motor control device forms a resistor assembly through multiple resistors to share the bus voltage and limit the voltage across the second capacitor during the charging or discharging process of the second capacitor, thereby ensuring the charging and discharging safety of the noise suppression circuit.

[0031] In the above technical solution, the above-mentioned first branch also includes: a first diode, the first end of the first diode is connected to the first bus, and the second end of the first diode is connected to the first end of the second capacitor; the two ends of the first control component are respectively connected to the second end of the second capacitor and the second bus; the noise suppression circuit also includes: a second diode, the first end of the second diode is connected to the second end of the first resistor, and the second end of the second diode is connected to the first end of the second capacitor.

[0032] In this technical solution, the first branch of the noise suppression circuit further includes a first diode, which is connected in series with the second capacitor and the first control component and is connected between the first bus and the second bus.

[0033] Specifically, the cathode of the first diode is connected to the first busbar, and the cathode of the first diode is connected to the first end of the second capacitor.

[0034] Furthermore, the noise suppression circuit is further provided with a second diode connected between the first branch and the second branch.

[0035] Specifically, the anode of the second diode is connected to the second end of the first resistor, and the cathode of the second diode is connected to the first end of the second capacitor.

[0036] It should be noted that when the above-mentioned second capacitor enters the energy discharging process, the current in the noise suppression circuit flows out of the second capacitor, flows from the positive electrode of the first diode to the negative electrode of the first diode, and finally flows out of the noise suppression circuit and flows into the first capacitor; after the second capacitor enters the energy charging process, the current in the noise suppression circuit flows through the first resistor, flows through the positive electrode of the second diode to the negative electrode of the second diode, and finally flows into the second capacitor.

[0037] In the noise suppression circuit of the motor control device of the present invention, by providing a first diode and a second diode, the unidirectional conductivity of the diodes is utilized to respectively limit the current flow direction of the second capacitor in the noise suppression circuit during the charging and discharging processes, thereby ensuring that the bus voltage can complete the charging of the second capacitor, and further ensuring that the second capacitor can complete the charging of the first capacitor, maintaining the minimum voltage value across the first capacitor, and avoiding large vibrations in the motor.

[0038] In the above technical solution, the first control component includes: a first switch, the first switch is connected to the second end of the second capacitor and the second bus respectively; and a third diode, the third diode is connected to both ends of the first switch respectively.

[0039] In this technical solution, the first control component consists of a first switch and a third diode, and the first switch is connected in parallel with the third diode.

[0040] Specifically, the first switch inside the first control component is connected in parallel with the third diode. When the first switch is turned on, the third diode will be short-circuited by the first switch, and the first control component is in the on state; when the first switch is turned off, the first switch is in the open state, the third diode is in the normal state, and the first control component is in the off state.

[0041] Furthermore, the anode of the third diode is connected to the second bus, and the cathode of the third diode is connected to the second end of the second capacitor. When the current flows from the positive pole to the negative pole, the third diode is in the on state; when the current flows from the positive pole to the negative pole, the third diode is in the off state.

[0042] It should be noted that when the second capacitor enters the energy discharging process, the current in the noise suppression circuit passes through the third diode and flows from the positive electrode of the third diode to the negative electrode of the third diode; when the second capacitor enters the energy charging process, the current in the noise suppression circuit passes through the first switch and finally flows into the second capacitor.

[0043] The motor control device of the present invention is composed of a first switch and a third diode to form a control component. By switching the switch state of the first switch, the state of the first control component is switched. When the first switch is turned on, the first control component is switched to the on state, and the second capacitor can be charged by the bus voltage to ensure the voltage value across the second capacitor, thereby ensuring that the second capacitor stores sufficient energy. When the first switch is disconnected, the first control component is switched to the off state, and the first capacitor can be charged by the second capacitor to ensure the voltage value across the first capacitor, thereby ensuring that the bus provides the voltage required for the normal operation of the control motor.

[0044] In the above technical solution, the second control component includes: a second switch, which is respectively connected to the second end of the second resistor and the second bus; and a fourth diode, which is respectively connected to both ends of the fourth switch.

[0045] In this technical solution, the second control component is composed of a second switch and a fourth diode, and the second switch is connected in parallel with the fourth diode.

[0046] Specifically, the second switch and the fourth diode are connected in parallel inside the second control component. When the second switch is turned on, the fourth diode will be short-circuited by the first switch, and the fourth control component is in the on state; when the second switch is turned off, the second switch is in the open state, the fourth diode is in the normal state, and the second control component is in the off state.

[0047] Furthermore, the anode of the above-mentioned fourth diode is connected to the second bus, and the cathode of the fourth diode is connected to the second end of the second capacitor. When the current flows from the positive pole to the negative pole, the fourth diode is in the on state; when the current flows from the positive pole to the negative pole, the fourth diode is in the off state.

[0048] It should be noted that when the second capacitor enters the energy discharging process, the current in the noise suppression circuit passes through the fourth diode and flows from the positive electrode of the fourth diode to the negative electrode of the fourth diode; when the second capacitor enters the energy charging process, the current in the noise suppression circuit passes through the second switch and finally flows into the second capacitor.

[0049] In the present invention, the motor control device is composed of a second switch and a fourth diode to form a control component, and the state of the second control component is switched by switching the switch state of the second switch. When the second switch is turned on, the second control component is switched to the on state, and the second capacitor can be charged by the bus voltage to ensure the voltage value across the second capacitor, thereby ensuring that the second capacitor stores sufficient energy. When the second switch is disconnected, the second control component is switched to the off state, and the first capacitor can be charged by the second capacitor to ensure the voltage value across the first capacitor, thereby ensuring that the bus provides the voltage required for the normal operation of the control motor.

[0050] In the above technical solution, the capacitance of the second capacitor is greater than the capacitance of the first capacitor.

[0051] In this technical solution, the first capacitor is a capacitor with a small capacitance value, and the second capacitor is an energy storage capacitor inside the noise suppression circuit. The second capacitor is a capacitor with a large capacitance value relative to the first capacitor.

[0052] The motor control device of the present invention deploys a second capacitor with a large capacitance value to ensure that the noise suppression circuit can store sufficient 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.

[0053] In the above technical solution, the motor control device also includes: a rectifier circuit, which is respectively connected to the power supply and at least two bus bars to convert the AC voltage output by the power supply into a DC voltage to power the at least two bus bars; an inverter circuit, which is respectively connected to the at least two bus bars and the motor to convert the DC voltage on the at least two bus bars into an AC voltage to control the working state of the motor connected to the inverter module.

[0054] 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 and transmitting it to the motor through the busbars.

[0055] Specifically, the inverter circuit is connected between the busbars, and the inverter circuit converts the direct current output by the rectifier circuit into alternating current to drive the motor.

[0056] Specifically, the first capacitor and the noise suppression circuit are respectively arranged between the rectifier circuit and the inverter circuit.

[0057] The motor control device in the present invention converts the AC voltage output by the power supply into a DC voltage through a rectifier circuit, thereby charging the second capacitor of the noise suppression circuit and facilitating the control of the motor. At the same time, the DC voltage is converted into an AC voltage through an inverter circuit and output to the motor to drive the motor and ensure the normal operation of the motor.

[0058] According to a second aspect of the present invention, a motor control method is proposed, which includes: controlling the first control component and the second control component to be turned on at the same time when the phases of the first control component and the second control component in the two branches are in the first phase and the bus voltage is less than a first voltage threshold; controlling the first control component and the second control component to be turned off at the same time when the phases of the first control component and the second control component are in the second phase or the bus voltage is greater than the second voltage threshold.

[0059] In this technical solution, the first control component and the second control component are switched to a synchronous state according to the phases of the first control component and the second control component and the comparison result between the voltage value of the bus voltage and the threshold value.

[0060] Furthermore, the first phase may be a turn-on phase of the first control component and the second control component, and the second phase may be a turn-off phase of the first control component and the second control component.

[0061] Furthermore, the first voltage threshold is a voltage value used to control the first control component and the second control component to be synchronously turned on, and the second voltage threshold is a voltage value used to control the first control component and the second control component to be turned off.

[0062] It can be understood that the above motor control method synchronously switches the on and off states of the first control component and the second control component according to the phases of the first control component and the second control component and the voltage value of the bus voltage.

[0063] Specifically, the control method switches the states of the first and second control components based on whether the first and second control components are in the first and second phases, and based on a comparison of the bus voltage between the buses with the first and second voltage thresholds. When the first and second control components are in the first phase and the bus voltage is less than the first voltage threshold, the first and second control components are synchronously switched to an on state. When the first and second control components are in the second phase or the bus voltage is greater than the second voltage threshold, the first and second control components are synchronously switched to an off state.

[0064] The motor control method of the present invention causes the first control component and the second control component to be synchronously switched to an on state under the conditions that the phase of the first control component and the second control component is equal to the first phase and the voltage value of the bus voltage is less than the first voltage threshold, and works together with the resistance component to limit the charging voltage of the second capacitor in the noise suppression circuit during the charging process, thereby ensuring that the noise suppression circuit smoothly performs the energy storage process and improving the stability of the second capacitor charging process.

[0065] When the phase of the first control component and the second control component is in the second phase, or the voltage value of the bus voltage is greater than the second voltage threshold, the first control component and the second control component are synchronously switched to the off state, so that the second capacitor can charge the first capacitor, ensuring the voltage value across the first capacitor, avoiding the bus voltage from dropping to a lower value, and thus avoiding large torque fluctuations in the motor, effectively reducing the noise of the motor.

[0066] In the above technical solution, the motor control method also includes: when the first control component and the second control component are in an open 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 not to charge the second capacitor.

[0067] In this technical solution, when the first control component and the second control are switched to the on state, and the bus voltage between at least two buses starts 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 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.

[0068] Specifically, after at least two busbars start charging the second capacitor, the voltage value across the second capacitor will continue to rise. By detecting the voltage value across the second capacitor and the voltage value of the busbar voltage, it is determined whether the charging process of the second capacitor is completed. The detected voltage value of the second capacitor is compared with the voltage value of the busbar voltage, and the voltage value of the busbar voltage is compared with the first voltage threshold. When the voltage value of the second capacitor is greater than the voltage value of the busbar voltage, and the voltage value of the busbar voltage is less than or equal to the first voltage threshold, it indicates that the second capacitor has been charged, and the busbar voltage will stop the charging process of the second capacitor.

[0069] The motor control method of the present invention 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, and stops the charging process after the charging process is complete. This ensures that the charging process of the second capacitor is completed, while preventing the energy in the second capacitor from being too high, thereby avoiding damage to the motor control device.

[0070] According to a third aspect of the present invention, a motor control device is proposed, which includes: a processing module for controlling the first control component and the second control component to be turned on at the same time when the phases of the first control component and the second control component in the two branches are in the first phase and the bus voltage is less than a first voltage threshold; the processing module is also used to control the first control component and the second control component to be turned off at the same time when the phases of the first control component and the second control component are in the second phase or the bus voltage is greater than a second voltage threshold.

[0071] In this technical solution, the processing module switches the first control component and the second control component to a synchronous state according to the phases of the first control component and the second control component and the comparison result of the voltage value of the bus voltage and the threshold value.

[0072] Furthermore, the first phase may be a turn-on phase of the first control component and the second control component, and the second phase may be a turn-off phase of the first control component and the second control component.

[0073] Furthermore, the first voltage threshold is a voltage value used to control the first control component and the second control component to be synchronously turned on, and the second voltage threshold is a voltage value used to control the first control component and the second control component to be turned off.

[0074] It can be understood that the processing module synchronously switches the on and off states of the first control component and the second control component according to the phases of the first control component and the second control component and the voltage value of the bus voltage.

[0075] Specifically, the processing module switches the states of the first control component and the second control component based on whether the first control component and the second control component are in the first phase and the second phase, and based on the comparison result of the voltage value of the bus voltage between the buses with the first voltage threshold and the second voltage threshold. When the phases of the first control component and the second control component are in the first phase and the voltage value of the bus voltage is less than the first voltage threshold, the first control component and the second control component are synchronously switched to the on state; when the phases of the first control component and the second control component are in the second phase or the voltage value of the bus voltage is greater than the second voltage threshold, the first control component and the second control component are synchronously switched to the off state.

[0076] In the motor control device of the present invention, under the conditions that the phase of the first control component and the second control component is equal to the first phase, and the voltage value of the bus voltage is less than the first voltage threshold, the processing module causes the first control component and the second control component to be synchronously switched to the on state, and works together with the resistance component to limit the charging voltage of the second capacitor in the noise suppression circuit during the charging process, thereby ensuring that the noise suppression circuit smoothly performs the energy storage process and improving the stability of the second capacitor charging process.

[0077] When the phase of the first control component and the second control component is in the second phase, or the voltage value of the bus voltage is greater than the second voltage threshold, the processing module causes the first control component and the second control component to be synchronously switched to the off state, so that the second capacitor can charge the first capacitor, ensuring the voltage value across the first capacitor, avoiding the bus voltage from dropping to a lower value, and thereby avoiding large torque fluctuations in the motor, effectively reducing the noise of the motor.

[0078] According to a fourth 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 described in any of the above technical solutions. Therefore, the motor control device possesses all the beneficial effects of the motor control method described in any of the above technical solutions, and further description thereof is omitted here.

[0079] According to a fifth aspect of the present invention, a readable storage medium is provided, storing a program or instructions thereon. When executed by a processor, the program or instructions implement the motor control method described in any of the above technical solutions. Therefore, the readable storage medium possesses all the beneficial effects of the motor control method described in any of the above technical solutions, and further description thereof is omitted here.

[0080] According to the sixth aspect of the present invention, a motor is proposed, comprising: a motor control device as defined in the above-mentioned first aspect, and / or a motor control device defined in the above-mentioned fourth aspect, and / or a readable storage medium defined in the above-mentioned fifth aspect, and thus having all the beneficial technical effects of the motor control device defined in the above-mentioned first aspect, and / or the motor control device defined in the above-mentioned fourth aspect, and / or the readable storage medium defined in the above-mentioned fifth aspect, and no further details will be given here.

[0081] According to a seventh aspect of the present invention, a washing machine is provided, comprising all the beneficial technical effects of the motor as defined in the sixth aspect above, which will not be elaborated herein.

[0082] Additional aspects and advantages of the invention will become apparent from the description which follows, or may be learned by practice of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0083] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0084] Figure 1 A circuit diagram of a motor control device in a first embodiment of the present invention is shown;

[0085] Figure 2 A schematic diagram showing the effect of the motor control device in the first embodiment of the present invention is shown;

[0086] Figure 3 A phase diagram of a motor control device in a first embodiment of the present invention is shown;

[0087] Figure 4 FIG1 shows a flow chart of a motor control method according to a second embodiment of the present invention;

[0088] Figure 5 FIG2 shows a second flow chart of a motor control method in a second embodiment of the present invention;

[0089] Figure 6 shows a block diagram of a motor control device in a third embodiment of the present invention;

[0090] Figure 7 shows a block diagram of a motor control device in a fourth embodiment of the present invention;

[0091] in, Figure 1 The corresponding relationship between the reference numerals and component names is as follows:

[0092] 100 Motor control device, 102 First bus, 103 Second bus, 104 First capacitor, 106 Noise suppression circuit, 108 First branch, 110 Second branch, 112 First control component, 114 Second capacitor, 116 Resistor assembly, 118 Second control component, 120 First resistor, 122 Second resistor, 124 First diode, 126 Second diode, 128 First switch, 130 Third diode, 132 Second switch, 134 Fourth diode, 136 Rectifier circuit, 138 Inverter circuit, 140 Motor, 142 Power supply. DETAILED DESCRIPTION

[0093] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present invention and the features therein can be combined with each other without conflict.

[0094] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0095] The following combination Figures 1 to 7 , the motor control device, motor control method, motor, readable storage medium and washing machine provided in the embodiments of the present application are described in detail through specific embodiments and their application scenarios.

[0096] Example 1:

[0097] like Figure 1 As shown, a first embodiment of the present invention provides a motor control device for controlling a motor. The motor control device 100 includes at least two busbars, a first capacitor 104, and a noise suppression circuit 106. The at least two busbars are connected to a motor 140; both ends of the first capacitor 104 are connected to the at least two busbars; and the noise suppression circuit 106 includes a first branch 108 and a second branch 110, each connected to the at least two busbars.

[0098] Among them, the first branch 108 and the second branch 110 are respectively connected to at least two busbars; the first branch is used to charge and discharge the first capacitor 104, including a first control component 112 and a second capacitor 114, and the second branch 110 is used to charge and divide the voltage of the second capacitor 114, including a resistor component 116 for voltage division.

[0099] In which, when the first control component 112 is in the on state and the bus voltage between at least two busbars is greater than the voltage of the second capacitor 114, at least two busbars charge the second capacitor 114; when the first control component 108 is in the off state and the voltage of the second capacitor 114 is greater than the bus voltage, the second capacitor 114 charges the first capacitor 104.

[0100] In this embodiment, the motor control device 100 is internally configured with at least two busbars, a first capacitor 104, and a noise suppression circuit 106. The aforementioned components are connected in such a manner that: the at least two busbars include a positive busbar and a negative busbar, each connected to the motor; and the busbar voltage between the at least two busbars varies over time.

[0101] Furthermore, the first capacitor 104 is connected between at least two busbars and may be a busbar capacitor. Specifically, the first capacitor 104 may be a small-capacitance capacitor for energy storage and filtering higher-frequency switching subharmonics.

[0102] Furthermore, the above-mentioned noise suppression circuit 106 includes two branches, a first branch 108 and a second branch 110, wherein the first branch 108 includes a first control component 112 and a second capacitor 114, the first control component 112 has two states: an on state and an off state, and the second capacitor 114 can be a capacitor with a larger capacitance value. The second capacitor 114 with a larger capacitance value is used to store energy and charge the first capacitor 104.

[0103] Furthermore, the second branch 110 includes a resistor component 116 , which may be composed of at least one resistor. The resistor component 116 may be used to share the bus voltage between at least two busbars.

[0104] It can be understood that when the first control component 112 in the noise suppression circuit 106 is turned on for the first time, the voltage across the second capacitor 114 in the noise suppression circuit 106 is zero, and the bus voltage will charge the second capacitor 114. Therefore, providing the resistor component 116 on the second branch 110 can reduce the inrush current when charging the second capacitor 114, thereby protecting the reliability of the second capacitor 114 in the noise suppression circuit 106.

[0105] Specifically, the first control component 112 can be switched between an on state and an off state. When the first control component 112 is switched to the on state, the voltage value of the bus voltage between at least two busbars can be compared with the voltage value across the second capacitor 114. When the voltage value of the bus voltage is less than the voltage value across the second capacitor 114, the second capacitor 114 will not be charged. When the voltage value of the bus voltage is greater than the voltage value across the second capacitor 114, the bus voltage starts to charge the second capacitor 114. When the first control component 112 is switched to the off state, the voltage value of the bus voltage between at least two busbars can be compared with the voltage value across the second capacitor 114. When the voltage value across the second capacitor 114 is less than the voltage value of the bus voltage, the second capacitor 114 does not need to discharge the first capacitor 104. When the voltage value across the second capacitor 114 is greater than the voltage value of the bus voltage, the second capacitor 114 starts to charge the first capacitor.

[0106] like Figure 2 The effect diagram of the motor control device 100 is shown in FIG. 1 , θ1 is the opening phase of the first control component, V s is the voltage value of the AC voltage at phase θ1, θ2 is the turn-off phase of the first control component, V e is the AC voltage at phase θ2. Without the noise suppression circuit 106, the AC voltage is rectified to the bus voltage. After the noise suppression circuit 106 is connected and the first control component 112 is enabled, if the current bus voltage is greater than the voltage of the second capacitor 114 in the noise suppression circuit 106, the bus voltage will charge the second capacitor 114. After the first control component 112 is turned off, if the voltage value of the second capacitor 114 in the noise suppression circuit 106 is less than or equal to the current bus voltage, the second capacitor 114 will not discharge to the outside, that is, the voltage value of the second capacitor 114 will remain unchanged; until the voltage value of the second capacitor 114 is greater than the current bus voltage, the second capacitor 114 will charge the first capacitor 104 (with a relatively small capacitance value). The voltage change across the second capacitor 114 during the charging and discharging process is shown in curve 204. At this time, the bus voltage is shown in curve 202, ensuring that the bus voltage does not fall too low, thereby achieving the purpose of increasing the minimum value of the bus voltage, and ultimately solving the noise problem of the motor control system with small-capacitance bus capacitors, and can reduce system vibration to a certain extent.

[0107] For example, the motor control device is used to control a permanent magnet synchronous motor. In the case where a small-capacitance bus capacitor is used in the permanent magnet synchronous motor control system, the bus capacitor has a small capacitance value, resulting in a low energy storage capacity. When the load is heavy, the bus voltage in the motor control device can easily 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, thereby generating greater noise.

[0108] In response to the above situation, the motor control device deploys a noise suppression circuit 106. The first control component 112 inside the noise suppression circuit 106 can be a power switch. The first control component 112 has two states: an on state and an off state. When the first control component 112 is in the on state, the voltage value of the bus voltage needs to be compared with the voltage value of the second capacitor 114. During the period when the voltage value of the bus voltage is less than the voltage value across the second capacitor 114, the second capacitor 114 does not have an energy charging operation; during the period when the voltage value of the bus voltage is greater than the voltage value across the second capacitor 114, the bus voltage starts to charge the second capacitor 114. When the first control component 112 is in the off state, the voltage value of the bus voltage needs to be compared with the voltage value across the second capacitor 114 in real time. During the period when the voltage value across the second capacitor 114 is less than the voltage value of the bus voltage, the second capacitor 114 does not have an energy discharge operation; during the period when the voltage value across the second capacitor 114 is greater than the voltage value of the bus voltage, the second capacitor 114 starts to charge the bus capacitor. Ensure the minimum value of the bus capacitance in the circuit to avoid large torque fluctuations in the motor, thereby reducing the noise generated by the motor.

[0109] It should be noted that if the bus voltage value is less than the voltage threshold for turning on the first control component 112, the first control component 112 is turned on at θ1; if the bus voltage value is greater than or equal to the voltage threshold for turning on the first control component 112, the first control component 112 will not be turned on until the next judgment;

[0110] Exemplarily, the motor control device includes a noise suppression circuit 106, which includes a first control component 112, a second capacitor 114, and a resistor component 116. When the first control component 112 is first switched to the on state, the voltage across the second capacitor 114 is zero, and the bus voltage begins to charge the second capacitor 114.

[0111] At this time, the surge current i of the second capacitor c_impulse for:

[0112]

[0113] Among them, V dc is the bus voltage at the time of opening, and R is the total resistance of the resistor component.

[0114] Exemplarily, the motor control device includes a noise suppression circuit 116, which is internally provided with a first control component 112, a second capacitor 114, and a resistor component 116, and has a set voltage threshold. When the first control component 112 is switched to the on state, the voltage across the second capacitor 114 is greater than the voltage of the bus voltage in the circuit, and the bus voltage is less than the voltage threshold, the energy in the second capacitor 114 is sufficient, and the bus will not charge the energy storage capacitor.

[0115] Exemplarily, the motor control device includes a noise suppression circuit, which includes a first control component 112, a second capacitor 114, and a resistor component 116, and a set voltage threshold. When the first control component 112 is switched to an on state, the voltage across the second capacitor 114 is less than the voltage of the bus voltage in the circuit, and the bus charges the second capacitor 114.

[0116] At this time, the surge current i of the second capacitor c_impulse for:

[0117]

[0118] Among them, V dc is the bus voltage value at the time of opening, V c is the voltage across the second capacitor, and R is the total resistance of the resistor assembly. Because the bus voltage and the voltage of the second capacitor are substantially equal at this time, the inrush current is very small.

[0119] In this embodiment, the motor control device 100 is internally deployed with at least two busbars, a first capacitor 104, and a noise suppression circuit 106. The noise suppression circuit 106 includes a first branch 108 and a second branch 110. The bus voltage can charge the first capacitor 104 through the first branch 108 in the noise suppression circuit 106 under appropriate circumstances, thereby maintaining the voltage across the first capacitor 104, ensuring that the bus provides the voltage required for the normal operation of the control motor, and avoiding large torque fluctuations in the motor. The second branch 110 in the noise suppression circuit can protect the second capacitor 114 when the bus voltage charges the second capacitor 114 of the first branch 108, effectively limiting the inrush current of the second capacitor 114, thereby improving the reliability of the noise suppression circuit. The noise suppression circuit can solve the noise problem that occurs in motor control devices with small-capacity bus capacitors, and can effectively suppress the system vibration problem caused by the motor control system being insufficient to provide the voltage required to control the motor.

[0120] In any of the above embodiments, a first end of the resistor assembly 116 is connected to a first busbar 102 of the at least two busbars, and the second branch 110 further includes: a second control component 118, a first end of the second control component 118 is connected to the resistor assembly 116, and a second end of the second control component 118 is connected to a second busbar 103 of the at least two busbars;

[0121] The second control component 118 can be in an on state or in an off state at the same time as the first control component 112 .

[0122] In this embodiment, at least two busbars include a first busbar 102 and a second busbar 103. The first busbar 102 is a positive busbar connected to the positive pole of the power supply 142, and the second busbar 103 is a negative busbar connected to the negative pole of the power supply 142.

[0123] Furthermore, the second branch 119 further includes a second control component 118 . The second control component 118 and the resistor assembly 116 are connected in series and connected between the first busbar 102 and the second busbar 103 .

[0124] Specifically, the first control component 112 and the second control component 118 can be connected in parallel, and both have two states: an on state and an off state. The first control component 112 and the second control component 118 can be set so that the first control component 112 and the second control component 118 maintain a synchronized state, that is, synchronously opened or synchronously disconnected.

[0125] For example, in the case where a small-capacitance bus capacitor is used in a permanent magnet synchronous motor control system, the motor control device deploys a noise suppression circuit 106, and a first control component 112 and a second control component 118 are deployed inside the noise suppression circuit 106. The first control component 112 and the second control component 118 can use power switches. The first control component 112 and the second control component 118 both have two states: on and off, and the first control component 112 and the second control component 118 can switch states at the same time and maintain the same state.

[0126] When the first control component 112 and the second control component 118 are switched to the on state, the voltage value of the bus voltage needs to be compared with the voltage value of the second capacitor 114. During the period when the voltage value of the bus voltage is less than the voltage value across the second capacitor 114, the second capacitor 114 has no charging operation; during the period when the voltage value of the bus voltage is greater than the voltage value across the second capacitor 114, the bus voltage starts to charge the second capacitor 114. When the first control component 112 and the second control component 118 are switched to the off state, the voltage value of the bus voltage needs to be compared with the voltage value across the second capacitor 114 in real time. During the period when the voltage value across the second capacitor 114 is less than the voltage value of the bus voltage, the second capacitor 114 has no energy discharge operation; during the period when the voltage value across the second capacitor 114 is greater than the voltage value of the bus voltage, the second capacitor 114 starts to charge the bus capacitor. Ensure the minimum value of the bus capacitor in the circuit to avoid large torque fluctuations in the motor, thereby reducing the noise generated by the motor.

[0127] It should be noted that when the first control component 112 and the second control component 118 are synchronously closed, the current within the noise suppression circuit 116 can flow from the first bus 102 to the second bus 103. When the bus voltage is greater than the voltage across the second capacitor 114, the second capacitor 114 enters a charging process, and the bus voltage charges the second capacitor 114. After the first control component 112 and the second control component 118 are synchronously disconnected, the current within the noise suppression circuit 106 can flow from the second bus 103 to the first bus 102, and the second capacitor 114 can enter a discharge process, and the second capacitor 114 charges the first capacitor 104. In this embodiment, the motor control device ensures that the noise suppression circuit 106 can operate normally and reduces the noise of the motor system by separately deploying the first control component 112 and the second control component 118.

[0128] In any of the above embodiments, the resistor assembly 116 includes: a first resistor 120, a first end of the first resistor 120 is connected to the first bus 102; a second resistor 122, a first end of the second resistor 122 is connected to the second end of the first resistor 120, and a second end of the second resistor 122 is connected to the second control component 118.

[0129] In this embodiment, the resistor assembly 116 is composed of two resistors, a first resistor 120 and a second resistor 122, connected in series.

[0130] Specifically, the first resistor 120 , the second resistor 122 and the second control component 118 may be connected in series and connected between the first bus 102 and the second bus 103 , and together constitute the second branch 110 of the noise suppression circuit 106 .

[0131] Furthermore, the combination of the first resistor 120 and the second resistor 122 can share the bus voltage, preventing a large surge current from being generated at the moment the second capacitor 114 starts to be charged, thereby preventing the second capacitor 114 from being damaged during the charging process.

[0132] Furthermore, under the same load condition, the minimum bus voltage is determined by the resistor component 116, 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°, the maximum voltage does not exceed If the second phase is greater than 90°, the maximum voltage shall not exceed Where V ac is the voltage value of the bus voltage, R1 is the first resistor, and R2 is the second resistor.

[0133] In this embodiment, the motor control device forms a resistor component through multiple resistors to share the bus voltage and limit the voltage across the second capacitor during the charging or discharging process of the second capacitor, thereby ensuring the charging and discharging safety of the noise suppression circuit.

[0134] In any of the above embodiments, the first branch 108 also includes: a first diode 124, the first end of the first diode 124 is connected to the first bus 102, and the second end of the first diode 124 is connected to the first end of the second capacitor 114; the two ends of the first control component 112 are respectively connected to the second end of the second capacitor 114 and the second bus 103; the noise suppression circuit 106 also includes: a second diode 126, the first end of the second diode 126 is connected to the second end of the first resistor 120, and the second end of the second diode 126 is connected to the first end of the second capacitor 114.

[0135] In this embodiment, the first branch 108 of the noise suppression circuit 106 further includes a first diode 124 . The first diode 124 is connected in series with the second capacitor 114 and the first control component 112 , and is connected between the first bus 102 and the second bus 103 .

[0136] Specifically, the cathode of the first diode 124 is connected to the first bus 102 , and the cathode of the first diode 124 is connected to the first end of the second capacitor 114 24 .

[0137] Furthermore, the noise suppression circuit 106 is further provided with a second diode 126 , which is connected between the first branch 108 and the second branch 110 .

[0138] Specifically, the anode of the second diode 126 is connected to the second end of the first resistor 120 , and the cathode of the second diode 126 is connected to the first end of the second capacitor 114 .

[0139] It should be noted that when the second capacitor 114 enters the discharging process, the current in the noise suppression circuit 106 flows out of the second capacitor 114, flows from the positive electrode of the first diode 124 to the negative electrode of the first diode 124, and finally flows out of the noise suppression circuit 106 and flows into the first capacitor 104; after the second capacitor 114 enters the charging process, the current in the noise suppression circuit 106 flows through the first resistor 120, flows through the positive electrode of the second diode 126 to the negative electrode of the second diode 126, and finally flows into the second capacitor 114.

[0140] For example, the first diode 124 and the second diode 126 may be a parasitic diode, a fast recovery diode, a power diode, etc.

[0141] In the noise suppression circuit 106 of the motor control device of this embodiment, by providing a first diode 124 and a second diode 126, the unidirectional conductivity of the diodes is utilized to limit the current flow direction of the second capacitor 114 in the noise suppression circuit 106 during the charging and discharging processes, respectively, to ensure that the bus voltage can complete the charging of the second capacitor 114, thereby ensuring that the second capacitor 114 can complete the charging of the first capacitor 104, maintaining the minimum voltage value across the first capacitor 104, and avoiding large vibrations in the motor.

[0142] In any of the above embodiments, the first control component 112 includes: a first switch 128, which is respectively connected to the second end of the second capacitor 114 and the second bus 103; and a third diode 130, which is respectively connected to both ends of the first switch 128.

[0143] In this embodiment, the first control component 112 is composed of a first switch 128 and a third diode 130 , and the first switch 128 and the third diode 130 are connected in parallel.

[0144] Specifically, the first switch 128 inside the first control component 112 is connected in parallel with the third diode 130. When the first switch 128 is turned on, the third diode 130 will be short-circuited by the first switch 128, and the first control component is in the on state; when the first switch is disconnected, the first switch is in the open state, the third diode is in the normal state, and the first control component is in the off state.

[0145] Furthermore, the anode of the third diode is connected to the second bus, and the cathode of the third diode is connected to the second end of the second capacitor. When the current flows from the positive pole to the negative pole, the third diode is in the on state; when the current flows from the positive pole to the negative pole, the third diode is in the off state.

[0146] It should be noted that when the second capacitor enters the energy discharging process, the current in the noise suppression circuit passes through the third diode and flows from the positive electrode of the third diode to the negative electrode of the third diode; when the second capacitor enters the energy charging process, the current in the noise suppression circuit passes through the first switch and finally flows into the second capacitor.

[0147] For example, the type of the first switch 128 may be MOSFET, IGBT, etc.

[0148] Exemplarily, the third diode 130 may be a parasitic diode, a fast recovery diode, a power diode, or the like.

[0149] In this embodiment, the motor control device comprises a first switch 128 and a third diode 130 to form a control component. By switching the switching state of the first switch 128, the state of the first control component 112 is switched. When the first switch 128 is turned on, the first control component 112 is switched to the on state, and the bus voltage is used to charge the second capacitor 114, thereby ensuring the voltage across the second capacitor 114 and thereby ensuring that the second capacitor 114 stores sufficient energy. When the first switch 128 is turned off, the first control component 112 is switched to the off state, and the second capacitor 114 is used to charge the first capacitor 104, thereby ensuring the voltage across the first capacitor 104 and thereby ensuring that the bus provides the voltage required to control the normal operation of the motor.

[0150] In any of the above embodiments, the second control component 118 includes: a second switch 132, which is respectively connected to the second end of the second resistor 122 and the second bus 103; and a fourth diode 134, which is respectively connected to both ends of the second switch 132.

[0151] In this embodiment, the second control component 118 is composed of a second switch 132 and a fourth diode 134 , and the second switch 132 and the fourth diode 134 are connected in parallel.

[0152] Specifically, the second switch 132 and the fourth diode 134 are connected in parallel inside the second control component 118. When the second switch 132 is turned on, the fourth diode 134 will be short-circuited by the second switch 132, and the second control component 118 is in the on state; when the second switch 132 is turned off, the second switch 132 is in the open state, the fourth diode 134 is in the normal state, and the second control component 118 is in the off state.

[0153] Furthermore, the anode of the fourth diode 134 is connected to the second busbar 103, and the cathode of the fourth diode 134 is connected to the second end of the second capacitor 114. When the current flows from the positive electrode to the negative electrode, the fourth diode 134 is in the on state; when the current flows from the negative electrode to the positive electrode, the fourth diode 134 is in the off state.

[0154] It should be noted that when the second capacitor 114 enters the discharging process, the current in the noise suppression circuit 106 passes through the fourth diode 134 and flows from the anode of the fourth diode 134 to the cathode of the fourth diode 134; when the second capacitor 114 enters the charging process, the current in the noise suppression circuit 106 passes through the second switch 132 and finally flows into the second capacitor 114.

[0155] For example, the type of the second switch 132 may be MOSFET, IGBT, etc.

[0156] For example, the fourth diode 134 may be a parasitic diode, a fast recovery diode, a power diode, or the like.

[0157] In this embodiment, the motor control device comprises a second control component 118 formed by a second switch 132 and a fourth diode 134. The state of the second control component 118 is switched by switching the switching state of the second switch 132. When the second switch 132 is on, the second control component 118 is switched to the on state, and the bus voltage is used to charge the second capacitor 114, thereby ensuring the voltage across the second capacitor 114 and thereby ensuring that the second capacitor 114 stores sufficient energy. When the second switch 132 is off, the second control component 118 is switched to the off state, and the second capacitor 114 is used to charge the first capacitor 104, thereby ensuring the voltage across the first capacitor 104 and thereby ensuring that the bus provides the voltage required to control the normal operation of the motor.

[0158] In any of the above embodiments, the capacitance of the second capacitor 114 is greater than the capacitance of the first capacitor 104 .

[0159] In this embodiment, the first capacitor 104 is a capacitor with a small capacitance, and the second capacitor 114 is an energy storage capacitor inside the noise suppression circuit. The second capacitor 114 is a capacitor with a larger capacitance than the first capacitor 104 .

[0160] In this embodiment, the motor control device deploys a large-capacitance second capacitor 114 to ensure that the noise suppression circuit 106 can store sufficient energy to charge the first capacitor 104, thereby ensuring the voltage value across the first capacitor 104. By deploying a small-capacitance first capacitor 104, higher-frequency switching subharmonics appearing within the motor control device can be filtered out.

[0161] In any of the above embodiments, the motor control device 100 also includes: a rectifier circuit 136, which is respectively connected to the power supply 142 and at least two bus bars to convert the AC voltage output by the power supply 142 into a DC voltage to power the at least two bus bars; an inverter circuit 138, which is respectively connected to the at least two bus bars and the motor 140 to convert the DC voltage on the at least two bus bars into an AC voltage to control the working state of the motor 140 connected to the inverter module.

[0162] In this embodiment, the motor control device is deployed with a rectifier circuit and an inverter circuit. The rectifier circuit is connected between the busbars, and the rectifier circuit is connected to the power supply, thereby converting the AC power output by the power supply into DC power and transmitting it to the motor through the busbar.

[0163] Specifically, the inverter circuit is connected between the busbars, and the inverter circuit converts the direct current output by the rectifier circuit into alternating current to drive the motor.

[0164] Specifically, the first capacitor and the noise suppression circuit are respectively arranged between the rectifier circuit and the inverter circuit.

[0165] In this embodiment, the motor control device converts the AC voltage output by the power supply into a DC voltage through a rectifier circuit, thereby charging the second capacitor of the noise suppression circuit and facilitating the control of the motor. At the same time, the DC voltage is converted into an AC voltage through an inverter circuit and output to the motor to drive the motor and ensure the normal operation of the motor.

[0166] Example 2:

[0167] like Figure 4 As shown, a second embodiment of the present invention provides a motor control method, the motor control method comprising:

[0168] Step 402: When the phases of the first control component and the second control component in the second branch are in the first phase and the bus voltage is less than the first voltage threshold, control the first control component and the second control component to be turned on simultaneously;

[0169] Step 404 : When the phases of the first control component and the second control component are in the second phase, or the bus voltage is greater than the second voltage threshold, control the first control component and the second control component to be disconnected simultaneously.

[0170] In this embodiment, the first control component and the second control component are switched to a synchronous state according to the phases of the first control component and the second control component and the comparison result between the voltage value of the bus voltage and the threshold value.

[0171] Furthermore, the first phase may be a turn-on phase of the first control component and the second control component, and the second phase may be a turn-off phase of the first control component and the second control component.

[0172] Furthermore, the first voltage threshold is a voltage value used to control the first control component and the second control component to be synchronously turned on, and the second voltage threshold is a voltage value used to control the first control component and the second control component to be turned off.

[0173] It can be understood that the above motor control method synchronously switches the on and off states of the first control component and the second control component according to the phases of the first control component and the second control component and the voltage value of the bus voltage.

[0174] Specifically, the control method switches the states of the first and second control components based on whether the first and second control components are in the first and second phases, and based on a comparison of the bus voltage between the buses with the first and second voltage thresholds. When the first and second control components are in the first phase and the bus voltage is less than the first voltage threshold, the first and second control components are synchronously switched to an on state. When the first and second control components are in the second phase or the bus voltage is greater than the second voltage threshold, the first and second control components are synchronously switched to an off state.

[0175] like Figure 3 The diagram shows the relationship between the AC voltage phase and the phases of the first control component and the second control component in the motor control device. The AC voltage phase 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.

[0176] Furthermore, the first phase is limited, and the phase range of the first phase is:

[0177] -V dc_val ≤V ac sinθ1≤V dc_val ;

[0178] Among them, θ1 is the first phase, V ac is the bus voltage value, V dc_val is the first voltage threshold.

[0179] Furthermore, the second phase is defined, and the phase relationship between the first phase and the second phase is:

[0180] |V ac sinθ1|≤|V ac sinθ2|;

[0181] Among them, θ1 is the first phase, θ2 is the second phase, V ac is the bus voltage value.

[0182] Furthermore, the second voltage threshold is limited, and the voltage value range of the second voltage threshold is:

[0183] V e >V s ;

[0184] Among them, V e is the second voltage threshold, V s is the bus voltage when the phases of the first control component and the second control component are in the first phase.

[0185] In the motor control method of this embodiment, under the conditions that the phase of the first control component and the second control component is equal to the first phase and the voltage value of the bus voltage is less than the first voltage threshold, the first control component and the second control component are synchronously switched to the on state, and work together with the resistance component to limit the charging voltage of the second capacitor in the noise suppression circuit during the charging process, thereby ensuring that the noise suppression circuit smoothly performs the energy storage process and improving the stability of the second capacitor charging process.

[0186] When the phase of the first control component and the second control component is in the second phase, or the voltage value of the bus voltage is greater than the second voltage threshold, the first control component and the second control component are synchronously switched to the off state, so that the second capacitor can charge the first capacitor, ensuring the voltage value across the first capacitor, avoiding the bus voltage from dropping to a lower value, and thus avoiding large torque fluctuations in the motor, effectively reducing the noise of the motor.

[0187] like Figure 5 As shown, the embodiment of the present application further provides a motor control method, which includes:

[0188] Step 502: When the phases of the first control component and the second control component in the second branch are in the first phase and the bus voltage is less than the first voltage threshold, control the first control component and the second control component to be turned on simultaneously;

[0189] Step 504: When the first control component and the second control component are in an 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 a first voltage threshold, control the bus voltage to not charge the second capacitor;

[0190] Step 506 : When the phases of the first control component and the second control component are in the second phase, or the bus voltage is greater than the second voltage threshold, control the first control component and the second control component to be disconnected simultaneously.

[0191] In this embodiment, when the first control component and the second control are switched to the on state, and the bus voltage between at least two buses starts 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 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.

[0192] Specifically, after at least two busbars start charging the second capacitor, the voltage value across the second capacitor will continue to rise. By detecting the voltage value across the second capacitor and the voltage value of the busbar voltage, it is determined whether the charging process of the second capacitor is completed. The detected voltage value of the second capacitor is compared with the voltage value of the busbar voltage, and the voltage value of the busbar voltage is compared with the first voltage threshold. When the voltage value of the second capacitor is greater than the voltage value of the busbar voltage, and the voltage value of the busbar voltage is less than or equal to the first voltage threshold, it indicates that the second capacitor has been charged, and the busbar voltage will stop the charging process of the second capacitor.

[0193] 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 the first voltage threshold, and stops the charging process after the charging process is complete. This ensures that the charging process of the second capacitor is completed, while preventing the energy in the second capacitor from being too high, thereby avoiding damage to the motor control device.

[0194] Example 3:

[0195] like Figure 6 As shown, a third embodiment of the present invention provides a motor control device, the motor control device comprising:

[0196] The processing module 602 is configured to control the first control component and the second control component in the second branch to be turned on simultaneously when the phases of the first control component and the second control component in the second branch are in the first phase and the bus voltage is less than a first voltage threshold;

[0197] The processing module 602 is further configured to control the first control component and the second control component to be disconnected simultaneously when the phases of the first control component and the second control component are in the second phase or the bus voltage is greater than a second voltage threshold.

[0198] In this embodiment, the processing module switches the first control component and the second control component to a synchronous state according to the phases of the first control component and the second control component and the comparison result between the voltage value of the bus voltage and the threshold value.

[0199] Furthermore, the first phase may be a turn-on phase of the first control component and the second control component, and the second phase may be a turn-off phase of the first control component and the second control component.

[0200] Furthermore, the first voltage threshold is a voltage value used to control the first control component and the second control component to be synchronously turned on, and the second voltage threshold is a voltage value used to control the first control component and the second control component to be turned off.

[0201] It can be understood that the processing module synchronously switches the on and off states of the first control component and the second control component according to the phases of the first control component and the second control component and the voltage value of the bus voltage.

[0202] Specifically, the processing module switches the states of the first control component and the second control component based on whether the first control component and the second control component are in the first phase and the second phase, and based on the comparison result of the voltage value of the bus voltage between the buses with the first voltage threshold and the second voltage threshold. When the phases of the first control component and the second control component are in the first phase and the voltage value of the bus voltage is less than the first voltage threshold, the first control component and the second control component are synchronously switched to the on state; when the phases of the first control component and the second control component are in the second phase or the voltage value of the bus voltage is greater than the second voltage threshold, the first control component and the second control component are synchronously switched to the off state.

[0203] In the motor control device of this embodiment, under the conditions that the phase of the first control component and the second control component is equal to the first phase, and the voltage value of the bus voltage is less than the first voltage threshold, the processing module causes the first control component and the second control component to be synchronously switched to the on state, and works together with the resistance component to limit the charging voltage of the second capacitor in the noise suppression circuit during the charging process, thereby ensuring that the noise suppression circuit smoothly performs the energy storage process and improving the stability of the second capacitor charging process.

[0204] When the phase of the first control component and the second control component is in the second phase, or the voltage value of the bus voltage is greater than the second voltage threshold, the processing module causes the first control component and the second control component to be synchronously switched to the off state, so that the second capacitor can charge the first capacitor, ensuring the voltage value across the first capacitor, avoiding the bus voltage from dropping to a lower value, and thereby avoiding large torque fluctuations in the motor, effectively reducing the noise of the motor.

[0205] In any of the above embodiments, the motor control device 600 also includes: a processing module 602, which is also used to control at least two buses to stop charging the second capacitor when the first control component and the second control component are in an 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.

[0206] In this embodiment, 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, and stops the charging process after the charging process is complete. This ensures that the charging process of the second capacitor is completed, while preventing the energy in the second capacitor from being too high, thereby avoiding damage to the motor control device.

[0207] Example 4:

[0208] like Figure 7 As shown, a fourth embodiment of the present invention provides a motor control device 700. The motor control device 700 includes a memory 702 and a processor 704. The memory 702 stores a program or instruction. When executed by the processor 704, the program or instruction implements the steps of the motor control method described in any of the above technical solutions. Therefore, the motor control device has all the advantages of the motor control method described in any of the above technical solutions, and no further details are given here.

[0209] Embodiment 5:

[0210] In a fifth embodiment of the present invention, a readable storage medium is provided on which a program is stored. When the program is executed by a processor, the motor control method in any of the above embodiments is implemented, thereby having all the beneficial technical effects of the motor control method in any of the above embodiments.

[0211] The readable storage medium includes a read-only memory (ROM), a random access memory (RSAM), a magnetic disk, or an optical disk.

[0212] Example 6:

[0213] In the sixth embodiment of the present invention, a motor is provided, comprising: a motor control device as in any of the above embodiments, and / or a readable storage medium as in any of the above embodiments, and thus having all the beneficial technical effects of the motor control device as in any of the above embodiments, and / or the readable storage medium as in any of the above embodiments, and no further details will be given here.

[0214] Embodiment seven:

[0215] A seventh embodiment of the present invention provides a washing machine, comprising: all the beneficial technical effects of the motor in any of the above embodiments, which will not be described in detail here.

[0216] It should be clarified that in the claims, specification, and drawings of the present invention, the term "plurality" refers to two or more. Unless otherwise expressly defined, the terms "upper" and "lower" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the drawings and are intended solely to facilitate the description of the present invention and simplify the description process. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in the specific orientations described. Therefore, these descriptions should not be construed as limiting the present invention. The terms "connect," "install," and "fixed" should be interpreted broadly. For example, "connection" can refer to a fixed connection between multiple objects, a detachable connection between multiple objects, or an integral connection between multiple objects; it can refer to a direct connection between multiple objects, or an indirect connection between multiple objects through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances of the above data. In the claims, specification, and drawings of the present invention, the terms "one embodiment," "some embodiments," "specific embodiment," and the like mean that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In the claims, specification, and drawings of the present invention, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0217] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A motor control device, characterized in that: The motor control device is used to control the motor, and the motor control device includes: at least two busbars, the at least two busbars being used to be connected to the motor; a first capacitor, wherein two ends of the first capacitor are respectively connected to the at least two busbars; a noise suppression circuit, the noise suppression circuit comprising a first branch and a second branch respectively connected to the at least two busbars, the first branch comprising a first control component and a second capacitor, the second branch comprising a resistor component capable of performing charge voltage division for the second capacitor; Wherein, when the first control component is in an on state and the bus 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 first 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 first end of the resistor assembly is connected to the first bus bar of the at least two bus bars; The second branch further includes: a second control component, wherein a first end of the second control component is connected to the resistor assembly, and a second end of the second control component is connected to a second busbar of the at least two busbars; Wherein, the second control component can be in an on state or in an off state at the same time as the first control component; The resistor assembly includes: a first resistor, wherein a first end of the first resistor is connected to the first bus bar; The first branch further includes: a first diode, wherein a cathode of the first diode is connected to the first bus bar, and a cathode of the first diode is connected to a first end of the second capacitor; Two ends of the first control component are connected to the second end of the second capacitor and the second busbar respectively; The noise suppression circuit further includes: A second diode, wherein an anode of the second diode is connected to the second end of the first resistor, and a cathode of the second diode is connected to the first end of the second capacitor.

2. The motor control device according to claim 1, characterized in that: The resistor assembly further includes: A second resistor, wherein a first end of the second resistor is connected to the second end of the first resistor, and a second end of the second resistor is connected to the second control component.

3. The motor control device according to claim 2, wherein: The first control component includes: a first switch, the first switch being connected to the second end of the second capacitor and the second busbar respectively; a third diode, wherein an anode of the third diode is connected to the second bus bar, and a cathode of the third diode is connected to the second end of the second capacitor.

4. The motor control device according to claim 2, wherein: The second control component includes: a second switch, the second switch being connected to the second end of the second resistor and the second bus bar respectively; a fourth diode, wherein one anode end of the fourth diode is connected to the second bus bar, and the cathode of the fourth diode is connected to the second end of the second resistor.

5. The motor control device according to any one of claims 1 to 4, characterized in that: 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 in that: The motor control device further includes: a rectifier circuit, the rectifier circuit being connected to the power supply and the at least two busbars respectively, so as to convert the AC voltage output by the power supply into a DC voltage to supply power to the at least two busbars; An inverter circuit is connected to the at least two busbars and can be connected to the motor to convert the DC voltage on the at least two busbars into an AC voltage to control the working state of the motor connected to the inverter circuit.

7. A motor control method, characterized in that: For the motor control device according to any one of claims 1 to 6, the motor control method comprises: When the phases of the first control component and the second control component in the two branches are both in the first phase and the bus voltage is less than a first voltage threshold, controlling the first control component and the second control component to be turned on simultaneously; When the phases of the first control component and the second control component are in the second phase, or the bus voltage is greater than a second voltage threshold, the first control component and the second control component are controlled to be disconnected simultaneously.

8. The motor control method according to claim 7, characterized in that: The motor control method further includes: When the first control component and the second control component are 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, the at least two buses are controlled to stop charging the second capacitor.

9. A motor control device, characterized in that: For implementing the motor control method according to claim 7 or 8, the motor control device comprises: a processing module, configured to control the first control component and the second control component in the two branches to be turned on simultaneously when the phases of the first control component and the second control component in the two branches are in a first phase and the bus voltage is less than a first voltage threshold; The processing module is further configured to control the first control component and the second control component to be disconnected simultaneously when the phases of the first control component and the second control component are in the second phase or the bus voltage is greater than a second voltage threshold.

10. A motor control device, characterized in that: The motor control device comprises: A memory and a processor, wherein the memory stores a program, and when the processor executes the program, the steps of the motor control method according to claim 7 or 8 are implemented.

11. A readable storage medium, characterized in that: The readable storage medium stores a program or instruction, and when the program or instruction is executed by the processor, the steps of the motor control method according to claim 7 or 8 are implemented.

12. A motor, characterized in that: include: The motor control device according to any one of claims 1 to 6; and / or, The motor control device according to claim 9 or 10; and / or, The readable storage medium of claim 11.

13. A washing machine, characterized in that: include: The motor as claimed in claim 12.

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