Medium-voltage high-rotation-speed brushless direct-current motor driver

Abstract

The invention discloses a medium-voltage high-rotation-speed brushless direct-current motor driver which drives a motor to rotate through a high-frequency PWM (pulse width modulation) modulation signal. The motor transmits the collected motor rotor information to an MCU (micro controller unit) micro processor through a detection circuit; the MCU micro processor can accurately collect a position signal of a rotor through a sampling signal with the frequency not less than 120KHz and a PWM duty ratio regulating signal with the frequency not less than 1KHz; the system can accurately control the rotation speed of the motor through controlling the duty ratio of the PWM modulation signal; in order to enable an MOSFET (metal oxide semiconductor field effect transistor) device in an inverter circuit to be able to operate normally under the high-switch frequency, a gate pole driving circuit which can rapidly drive the MOSFET to be conducted or switched off is added at the front end of the inverter circuit, thus the MOSFET can be rapidly conducted or switched off under the driving of the high-frequency PWM modulation signal. The medium-voltage high-rotation-speed brushless direct-current motor driver provided by the invention not only is simple in structure, but also has good control characteristic and high working efficiency, thus the highest rotation speed of the motor is improved.

Description

technical field [0001] The invention relates to a medium-voltage high-speed brushless DC motor driver. Background technique [0002] The brushed DC motor has the characteristics of large torque, hard mechanical properties, and high efficiency, but its speed is generally not very high due to the existence of brushes and commutators. Although the speed of induction motors can reach very high, the torsional torque of such motors is generally relatively small. Since the brushless DC motor has no limitations of brushes and commutators, it has the characteristics of large torsional torque, hard mechanical characteristics, high efficiency and high speed of the induction motor of the brushed DC motor, so there is no Brushed DC motors have become one of the most promising motor products. Most of the common high-speed motor controllers are realized by changing the frequency of the driving voltage through a frequency converter. This kind of frequency converter has the disadvantages o...

AI Technical Summary

Problems solved by technology

Most common high-speed motor controllers are realized by changing the frequency of the driving voltage through a frequency converter. This kind of frequency converter has the disadvantages of low efficiency and low motor speed control.

At present, domestic research on brushless DC motor drivers mainly focuses on low- and medium-speed brushless DC motor drivers, while there are not many studies involving high-speed brushless DC motor drivers.

Images