Control method for drive control system of single-phase brushless direct-current motor

Abstract

The invention provides a control method for a drive control system of a single-phase brushless direct-current motor. The system comprises a direct-current power supply module, a control module, a power drive bridge module, a signal sampling module and a rotating speed regulation module, wherein the direct-current power supply module is used for supplying electricity to the system, the power drive bridge module and the signal sampling module are in signal connection with the control module, and the rotating speed regulation module is used for presetting the rotating speed of the motor. The method includes the steps that the system is powered on; the rotating speed regulation module is regulated, and the expected motor rotating speed Ve is preset; the control module conducts sampling on coherent signals and calculates the actual motor rotating speed Vr; the actual motor rotating speed Vr is compared with the expected motor rotating speed Ve, if the actual motor rotating speed Vr is lower than the expected motor rotating speed Ve, motor winding excitation time is prolonged, and otherwise motor winding excitation time is shortened. The high duty ratio and long-time excitation motor windings can be avoided from occurring in a Hall one-half cycle, the situation that the service life of the motor is shortened due to overheating of the motor windings and eddy current losses of a magnetic core is avoided, operation of the motor is monitored in real time, the rotating speed of the motor is controlled in real time, and high motor rotating speed requirements are met.

Description

technical field [0001] The invention relates to a driving control method of a motor, in particular to a control method of a driving control system of a single-phase brushless DC motor. Background technique [0002] Among brushless DC motors, single-phase BLDC (brushless DC motor) has the least number of phases, relatively simple electrical system, and low cost of the required drive control circuit. It is widely used in the fields of electric tools, fans, and vacuum cleaners. At present, the usual single-phase BLDC drive control adopts the H-bridge-PWM drive control method. During the Hall half cycle, the H-bridge power device is driven by PWM to excite the motor winding, and the PWM duty cycle is appropriately adjusted to control the motor speed. Since the windings are continuously excited by PWM during the entire Hall half cycle, the efficiency is not very high, especially in applications with higher speeds, a larger duty cycle and a longer time to excite the motor windings...

AI Technical Summary

Problems solved by technology

Since the windings are continuously excited by PWM during the entire Hall half cycle, the efficiency is not very high, especially in applications with higher speeds, a larger duty cycle and a longer time to excite the motor windings can easily lead to increased core eddy current losses 1. Excessive excitation and heating of the motor winding, the temperature rise of the entire motor is too large, which greatly affects the performance and service life of the motor

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