Delay-free control method and control device for high-speed brushless direct current motor

Abstract

The invention relates to a delay-free control method for a high-speed brushless direct current motor. The method comprises the following steps: acquiring a zero crossing point signal ux from a comparison circuit; determining the delay time TF of the window filter according to the interference pulse width delta T; enabling the window filter to filter the zero crossing point signal ux to obtain a signal Sx; calculating electrical angle time T30 degrees and motor rotating speed feedback omega according to Sx obtained by filtering ux through a window filter; calculating delay TD according to the determined window filter delay time TF and the calculated electrical angle time T30 degrees; and finally, delaying the signal Sx by TD to determine a logic commutation signal Fx. The control device comprises a comparison circuit module, a window filtering module and a delay calculation module. According to the characteristics of interference signals, the window filter with controllable delay time is designed, interference in the phase current follow current process is removed through the window filter, clear counter electromotive force zero crossing point signals are obtained, and the method has the advantage of no filtering delay, and is scientific, easy to implement and suitable for brushless direct current motors with different parameters.

Description

technical field

[0001] The invention relates to the technical field of motor control, in particular, the invention relates to a non-delay control method for detecting the zero-crossing point of the counter electromotive force of a high-speed brushless DC motor. Background technique

[0002] Brushless DC motors based on electronic commutation instead of mechanical commutation have the advantages of high reliability and high efficiency, and have been widely used. In applications such as aviation and aerospace, due to the limitation of the application environment, the position sensor of the motor is usually omitted for safety reasons. The control methods of position sensorless brushless DC motor mainly include counter electromotive force zero-crossing detection method, terminal voltage comparison method and third harmonic method, etc. Among them, the back EMF zero-crossing detection method has become a more commonly used positionless control method because of its advantages of...

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