Controller of motor, motor and clothes processing device

Abstract

The invention provides a controller of a motor, the motor and a clothes processing device. The controller of the motor comprises a direct current bus; the rectifying circuit is used for converting alternating-current voltage output by the alternating-current power supply into direct-current voltage so as to supply power to the direct-current bus; the control circuit comprises a capacitor assembly and a first switch, and the capacitor assembly is connected to the direct current bus by controlling the first switch, so that the minimum value of the voltage on the direct current bus is limited to be within a preset range; and the inverter circuit is used for converting the direct-current voltage on the direct-current bus into alternating-current voltage so as to control the working state of a motor connected with the inverter circuit. According to the motor controller provided by the technical scheme of the invention, the minimum value of the bus voltage of the direct-current bus can be always controlled to be about half of the amplitude of the alternating-current voltage, and the situation that the rotating speed control is unstable due to the fact that torque pulsation is likely to occur when the rotating speed of the to-be-controlled motor is low and the torque needs to be large is avoided.

Description

technical field [0001] The present invention relates to the technical field of motors, and in particular, to a controller of a motor, a motor and a clothes treating device. Background technique [0002] In the prior art, the controllers of motors with small busbar capacitors / no electrolytic capacitors have been widely used in household appliances such as air conditioners, water pumps, and washing machines because of their small size, long life, high power factor, and low cost. However, this kind of controller does not have a large electrolytic capacitor energy storage unit on the DC bus. When the motor operates at a low speed, it will generate a torque pulsation that is an integer multiple of the frequency of the AC power supply voltage, which may easily lead to unstable speed control and cause noise problems. , it will seriously cause the motor controller to malfunction. Therefore, how to provide a technical solution that can prevent the controller of a motor with small bu...

AI Technical Summary

Problems solved by technology

However, since this kind of controller does not have a large electrolytic capacitor energy storage unit on the DC bus, when the motor is running at low speed, it will generate a torque ripple that is an integer multiple of the frequency of the AC power supply voltage, which will easily lead to unstable speed control and noise problems. , will seriously cause the controller of the motor to malfunction

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