Method for upwind starting of permanent magnet brushless direct-current motor

Abstract

The invention discloses a method for upwind starting of a permanent magnet brushless direct-current motor. A phase-locked loop estimation algorithm is adopted, and the state of the motor is followed quickly; through the mode that a given current is zero, the current rotating speed of the motor is estimated; in the case of motionlessness or forward rotation of the motor, starting is easy to handle,and the method focuses on solving the situation of upwind operation; according to the rotating speed of reverse rotation, through formulas of Iq=k1*omega and Id=0, torque enabling the motor to stop quickly is generated; at the moment, the voltage of a direct-current bus is increased obviously, the voltage of the bus needs to be monitored in real time, when the voltage of the direct-current bus ishigher than a limit value, the current output is appropriately lowered, or the output is stopped, and the voltage of the bus is prohibited from continuing being increased; when reverse torque acts onthe motor, the motor is stopped quickly, when the reverse rotation speed of the motor is decreased to zero from a high speed, reverse rotation is switched into forward rotation; and when the forwardrotation speed of the motor reaches a certain value, the starting process is completed, the motor is switched into normal control loops such as control of the speed loop or the other loops.

Description

technical field [0001] The invention relates to an upwind starting system, in particular to a method for upwind starting of a permanent magnet brushless DC motor. Background technique [0002] In most home appliance applications, permanent magnet brushless DC controllers use sensorless position estimation algorithms due to reasons such as cost and Hall sensor installation. No position estimation algorithm needs to know the model of the motor, such as resistance, inductance, back EMF constant, etc. This algorithm is easy to handle when the motor is stationary or rotating in the forward direction. In practical applications, for the situation that the fan is started against the wind, the requirements for the non-position estimation algorithm are getting higher and higher. [0003] Many position sensorless algorithms solve the problem of starting the motor by collecting information related to the back electromotive force through the hardware circuit, and judging the direction ...

AI Technical Summary

Problems solved by technology

After the motor is stopped, the specific position of the motor cannot be known, and the difficulty of starting will also increase. It is prone to failure to start and frequent starts, which will cause serious wear and tear on the motor and reduce the life of the motor.

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