Brushless direct current motor driver

Abstract

The present invention discloses a brushless direct current motor driver. The brushless direct current motor driver comprises a DSP chip, the DSP chip is connected with a position estimation circuit, adriving chip, a difference current sampling circuit and a voltage collection and amplification circuit, the driving chip is connected with a bridge circuit, and the position estimation circuit, the bridge circuit, the difference current sampling circuit and a voltage sampling and amplification circuit are connected with a motor; the bridge circuit is a three-phase half-bridge circuit and is formed by 6 field effect transistors, each two of the field effect transistors is one half bridge, and one midpoint of each half bridge is connected with one phase of the motor; space vector pulse width modulation is performed in the DSP chip to convert square wave signals to sine wave signals for output; and PWM signals output after space vector pulse width modulation are acted on the three-phase half-bridge circuit through the driving chip and are finally taken as switching signals of the 6 field effect transistors, so as to allow the output current to be a sine wave current. The commutation process is smooth and steady, the noise is small, and the torque ripple is small.

Description

technical field [0001] The invention belongs to the technical field of brushless direct current drive, and in particular relates to a brushless direct current motor driver. Background technique [0002] The brushless DC control of the existing brushless DC motor driver usually adopts the square wave control method, obtains the position of the rotor through the mechanical sensor, and performs forced commutation at a specific position, resulting in unstable commutation process, large torque ripple, The problem of high noise decibels. Contents of the invention [0003] The object of the present invention is to provide a brushless DC motor driver, which has a stable commutation process, low noise and small torque ripple. [0004] The technical scheme adopted in the present invention is: [0005] A brushless DC motor driver, which includes a DSP chip, the DSP chip is respectively connected with a position estimation circuit, a space vector pulse width modulator, a differentia...

AI Technical Summary

Problems solved by technology

[0002] The brushless DC control of the existing brushless DC motor driver usually adopts the square wave control method, obtains the position of the rotor through the mechanical sensor, and performs forced commutation at a specific position, resulting in unstable commutation process, large torque ripple, The problem of high noise decibels

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