Motor speed regulation method, motor speed regulation system and air conditioner

Abstract

The invention provides rotating speed adjusting method and system of a motor and an air conditioner. The method comprises the steps of setting a target rotating speed for the motor of the air conditioner according to a received setting instruction; setting a plurality of time intervals according to the target rotating speed; detecting the power supply voltage of the air conditioner; connecting and disconnecting a driving circuit of a power device of the air conditioner according to the plurality of time intervals in a sequence within the following half voltage cycle after detecting that the power supply voltage is zero, so as to adjust the actual rotating speed of the motor by adjusting the effective value of the power supply voltage. According to the technical scheme, the method has the advantages that the chopping time of the power device can be dispersed into the whole voltage waveform during the stepless speed variation process, thus the vibration and noise caused by the distortion of voltage and current can be removed, the silence degree of the air conditioner in running can be improved, and as a result, the performances of the air conditioner can be improved, and the user experience is increased.

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 of the power device, 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; the zer...

AI Technical Summary

Problems solved by technology

[0006] 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.

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