Motor rotating speed adjusting method, motor rotating speed adjusting system, and air conditioner

Abstract

The invention provides a motor rotating speed adjusting method, a motor rotating speed adjusting system, and an air conditioner. The motor rotating speed adjusting method comprises: according to a received setting command, a target rotating speed of a motor of an air conditioner is set and a chopping time interval is set for the motor based on the target rotating speed; on the basis of the target rotating speed, a target rotating speed gear is selected from multiple rotating speed gears of the air conditioner for the motor; a voltage of the target rotating speed gear is detected; and when the voltage of the target rotating speed gear is detected to be in a zero-crossing mode, chopping speed modulation is carried out on the motor according to the chopping time interval. On the basis of the technical scheme, tap speed regulation is carried out on the motor of the air conditioner; a gear capable of providing a rotating speed closest to the target rotating speed is selected; and then chopping speed modulation is carried out on the motor. Therefore, the chopping amount of the motor voltage is substantially reduced; the vibration and noise caused by voltage and current distortion under the chopping speed modulation can be reduced; the quiet degree of the air conditioner running is improved; and the user experience is enhanced.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular, to a method for adjusting the rotational speed of a motor, a system for adjusting the rotational speed of a motor, and an air conditioner. Background technique [0002] At present, the indoor unit of the air conditioner generally adopts such as figure 1 The shown AC asynchronous circuit with feedback device can realize the function of stepless speed regulation. Its specific implementation process is as follows: [0003] Such as figure 1 As shown, the stepless speed regulation control circuit of the air conditioner mainly has the following parts: main control chip, power supply, voltage zero-crossing detection circuit, power device, drive circuit 1, relay, drive circuit 2, motor body and speed feedback device . The main control chip accurately turns on and off the power device through the driving circuit according to the zero-crossing signal of the power supply voltage;...

AI Technical Summary

Problems solved by technology

[0007] However, in the traditional stepless speed regulation, the power device performs continuous-time chopping after the zero-crossing signal, that is, chopping the waveform of every half cycle, which greatly distorts the waveform of the voltage and current applied to the motor terminal. , although the stability of the motor speed can be achieved, it will have a certain impact on the operation of the motor, especially the motor will generate a lot of noise, vibration or resonance, etc.

However, the traditional tap speed regulation is very rough in adjusting the speed, and the accuracy is low, so it is impossible to obtain the best speed.

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