Linear power driving controller based on large-power operational amplifier for three-phase alternating current motor

Abstract

A linear power driving controller based on large-power operational amplifier for a three-phase alternating current motor consists of a linear power driving module, a signal detecting module, a digital control module and a digital-analogue (D / A) converting module. The signal detecting module detects a motor three-phase winding current signal and a motor rotor position signal, converts the signals into signals which can be directly received by the signal detecting module and transmits the signals to the signal detecting module. The signal detecting module finishes calculation of a control algorithm according to received motor state information and gives a digital quantity control signal. The D / A converting module converts the digital quantity control signal into an analog quantity control signal and transmits the analog quantity control signal to the linear power driving module. The linear power driving module isolates the analog quantity control signal and a power level signal, further performs power amplification, provides high voltage and large current for a motor winding and accordingly achieves high-precision control of the three-phase alternating current motor. The linear power driving controller has good application prospect in the technical field of electric motor automatic control.

Description

1. Technical field [0001] The invention relates to a linear power drive controller based on a high-power operational amplifier for a three-phase AC motor, which is mainly used in low-power occasions and belongs to the technical field of motor automatic control. 2. Background technology [0002] There are two main ways to realize the power drive circuit of high-precision servo motor: pulse width modulation (Pusle Width Modulation, PWM) and linear power amplification. At present, because the pulse width modulation method has the advantages of small power loss, high efficiency, and easy full digital control drive, it has been widely used in motor power drive. [0003] However, the high-frequency modulation switching action seriously pollutes the electromagnetic environment and affects the normal operation of sensors, signal conversion and conditioning circuits in the servo system; the pulse width modulation method introduces switching frequency sub-harmonics into the motor wind...

AI Technical Summary

Problems solved by technology

[0006] Currently, linear power drive technology based on high-power op amps is only used for brushed DC motors, two-phase stepper motor systems, voice coil motors, and other motors driven in the form of H bridges.

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