Motor controller with short circuit protection function and motor control system with the same

Abstract

The invention discloses a motor controller with a short circuit protection function, and a motor control system with the same. The motor controller includes a rotary transformer decoding chip, and a rotary transformer excitation buffer circuit integrated with a short circuit protection circuit, wherein the short circuit protection circuit includes a short circuit protection control unit and a short circuit protection unit; the short circuit protection control unit is used for detecting the short circuit fault occurred in the rotary transformer excitation buffer circuit, and starting the short circuit protection unit when the short circuit fault is detected; the short circuit protection unit limits the maximum working current value of the rotary transformer excitation buffer circuit as a set safety current value; and the short circuit protection control unit is also used for closing the short circuit protection unit when the short circuit fault in the rotary transformer excitation buffer circuit is eliminated, so as to enable the working current of the rotary transformer excitation buffer circuit to reduce from the set safety current value and recover to a normal working current value.

Description

technical field [0001] The invention relates to the technical field of motor controllers, more specifically, to a motor controller with a short-circuit protection function and a motor control system equipped with it. Background technique [0002] At present, the resolver excitation buffer circuit used in the motor controller with motor position feedback commonly used in China is not designed with a short circuit protection circuit. Because there is often a certain distance between the motor controller and the installation location of the motor, a very long lead wire needs to be connected between the resolver excitation buffer circuit of the motor controller and the resolver of the motor, which easily causes a short circuit fault. When a short-circuit fault occurs in the motor controller, the operating current of the resolver excitation snubber circuit rises rapidly, which causes damage to key components (such as triodes) of the resolver excitation snubber circuit, which caus...

AI Technical Summary

Problems solved by technology

When a short-circuit fault occurs in the motor controller, the operating current of the resolver excitation snubber circuit rises rapidly, which causes damage to the key components (such as triode) of the resolver excitation snubber circuit, thus causing the motor controller to stop working and the motor position The tracking function is lost, and the entire motor control system is in a state of paralysis, which seriously threatens the safety of the vehicle equipped with the motor control system