High-speed brushless direct-current motor controller on basis of BUCK converter

Abstract

The invention discloses a high-speed brushless direct-current motor controller on the basis of a BUCK converter. The high-speed brushless direct-current motor controller comprises a direct-current power source, the Buck converter, a three-phase inverter bridge, a hardware phase change circuit, motor control algorithms, a man-machine communication DSP (digital signal processing) control board, a PWM (pulse width modulation) driving module, a voltage and current detection circuit, a protection circuit and a touch screen. Direct currents can be converted into adjustable direct-current voltages by the Buck converter, the three-phase inverter bridge and the hardware phase change circuit are used for changing phases of a brushless direct-current motor, the motor control algorithms are used for acquiring voltage and current signals and outputting PWM signals, and PWM driving signals can be provided for the brushless direct-current motor by the PWM driving module. The high-speed brushless direct-current motor controller has the advantages that the high-speed brushless direct-current motor controller is in such a control mode that the Buck converter is additionally arranged at the front of the three-phase inverter bridge, accordingly, a phase change function and a speed regulation function of the direct-current motor are separated form each other, original PWM pulse voltages are replaced by the direct-current voltages under the regulation effects of the Buck converter, discontinuous jumping of stator currents can be effectively eliminated, and iron loss of the motor can be reduced; software phase change programs are replaced by the hardware logic phase change circuit, accordingly, the complexity of DSP programs can be lowered, a DSP (digital signal processor) can concentrate on the motor control algorithms, and the control efficiency can be improved.

Description

technical field [0001] The invention belongs to a motor control device, in particular to a high-speed brushless DC motor controller based on a BUCK converter. Background technique [0002] Brushless DC motor has excellent mechanical characteristics, good speed regulation torque, high efficiency and other characteristics, and has a wide range of applications. At present, most brushless DC motors use the control method of three-phase inverter bridge PWM modulation (pulse width modulation), but when this method is applied to high-speed motors, due to the small inductance of the high-speed motor armature, the high-frequency square wave voltage generated by PWM modulation , causing additional iron loss in the rotor, resulting in excessive heat generation and rapid temperature rise during the cycle-up process of the motor. Contents of the invention [0003] The present invention is proposed to solve the problems existing in the prior art, and its purpose is to provide a high-sp...

AI Technical Summary

Problems solved by technology

At present, most brushless DC motors use the control method of three-phase inverter bridge PWM modulation (pulse width modulation), but when this method is applied to high-speed motors, due to the small inductance of the high-speed motor armature, the high-frequency square wave voltage generated by PWM modulation , causing additional iron loss in the rotor, resulting in excessive heat generation and rapid temperature rise during the cycle-up process of the motor

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