Start control method and device for outdoor blower fan of air conditioner

Abstract

The invention discloses a start control method for an outdoor blower fan of an air conditioner. The outdoor blower fan comprises an outdoor motor and a motor driver. The start control method for the outdoor blower fan comprises the following steps of: charging a bootstrap capacitor in the motor driver by using a charging power supply after a start instruction is received; detecting the three-phase current of the outdoor motor in the bootstrap capacitor charging process; determining the rotor state of the outdoor motor according to the three-phase current of the outdoor motor in order to acquire the initial start operating condition of the outdoor blower fan; and performing start control on the outdoor blower fan according to the initial start operating condition of the outdoor blower fan. The start control method may accurately determine the initial start operating condition of the outdoor blower fan without an increase in hardware cost or prolongation in software execution time, thereby guaranteeing the heat-dissipating effect of an air-conditioning heat exchanger and improving the start reliability of the motor. The invention also discloses a start control device for the outdoor blower fan of the air conditioner.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to a method for starting and controlling an outdoor fan in an air conditioner and a device for starting and controlling an outdoor fan in an air conditioner. Background technique [0002] At present, for the consideration of energy saving, noise reduction and cost, PMSM (Permanent Magnet Synchronous Motor, permanent magnet synchronous motor) using SensorlessFOC (Sensorless Field Oriented Control, sensorless field oriented control) control strategy can be widely used in the outdoor fan of air conditioner. Due to the initial working conditions of the outdoor unit fan of the air conditioner, there are wind-driven forward rotation (that is, forward rotation under the action of external wind force), wind-driven reverse rotation (that is, reverse rotation under the action of external wind force) and static conditions. , in order to improve the starting reliability of the outdoor ...

AI Technical Summary

Problems solved by technology

[0003] In the related technology, the scheme that can improve the reliability of motor starting is to add the motor opposite potential detection circuit in the driver hardware circuit, and judge the forward and reverse wind conditions by detecting the opposite potential of the motor, but this scheme increases the hardware cost and the driver At the same time, due to the addition of a part of the back EMF detection circuit, the overall reliability of the driver will also be reduced; there is also a zero-current control scheme before the motor is started on the software (that is, artificially control the current injected into the three-phase winding of the motor to 0) According to the three-phase current and voltage detected in the process of zero-current control, the rotation direction and speed of the motor rotor can be judged, and the starting control of the fan under different working conditions can be carried out on this basis. However, due to the increased Zero current control process, so it will lead to a relatively long starting time of the motor, which will affect the heat dissipation effect of the air conditioner heat exchanger

Images