A terminal short-circuit protection system for permanent magnet synchronous motor based on voltage feedforward

Abstract

The invention relates to the technical field of synchronous motor fault processing, in particular to a permanent magnet synchronous motor end short circuit protection system based on voltage feedforward. The system comprises a bus voltage filter, a voltage slope detector, a voltage threshold determiner and an end short circuit action actuator, and the bus voltage filter filters the direct currentbus voltage of an inverter; when a rising slope exceeds a set threshold, the end short circuit action actuator is triggered to work; when a direct current bus voltage value exceeds the set threshold,the end short circuit action actuator is triggered to work, and the end short circuit action actuator adjusts the synchronous motor current to a steady-state current point for short-circuit operation.The system has the advantages that by detecting the slope of the voltage change, a synchronous motor fault can be detected in advance, an action is conducted in advance, so that the steady-state current adjustment has sufficient time, short-circuit transient inrush current is avoided, and controller component safety is protected.

Description

technical field [0001] The invention relates to the technical field of synchronous motor fault processing, in particular to a voltage feed-forward based permanent magnet synchronous motor end short circuit protection system. Background technique [0002] With the development of the national economy and science and technology, motors play an increasingly important role in all walks of life. Due to its many advantages in design, manufacture and control, permanent magnet synchronous motors are widely used in various industrial production and life occasions. In addition, my country is rich in rare earth resources, and the application market of permanent magnet synchronous motors is particularly large in my country. Permanent magnet synchronous motors can be divided into surface mount type and built-in type according to the similarities and differences of AC-D axis inductance. Because the built-in permanent magnet synchronous motor (IPMSM) can have a wide speed range under the c...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: the current technical problem that the components in the controller are easily damaged when the permanent magnet synchronous motor fails

By controlling the phase current of the synchronous motor to reach the steady-state current point and monitoring the voltage value at the same time, the contradiction between voltage and current in the end short circuit algorithm is solved, and the voltage and current can be guaranteed to be within the limited range

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