Simulation method and system for magnetism loss fault of permanent magnet synchronous motor and medium

Abstract

The invention relates to the technical field of motors, and discloses a simulation method and a system for magnetism loss fault of a permanent magnet synchronous motor, and a medium. The authenticityand validity of the magnetism loss fault simulation of the permanent magnet synchronous motor are improved, and a more real and reliable environment is provided for the magnetism loss fault simulationof the permanent magnet synchronous motor. The method comprises the following steps of: establishing a three-phase coordinate system of the permanent magnet synchronous motor under the condition of the magnetism loss fault; calculating a first synthesized voltage of the permanent magnet synchronous motor in the three- phase coordinate system; converting the first synthesized voltage into a secondsynthesized voltage under a two-phase rotating coordinate system; determining an internal constraint condition required for model construction based on the second synthesized voltage when the permanent magnet synchronous motor has the magnetism loss fault; establishing a torque equation, a rotor motion equation, and an internal voltage equation of the permanent magnet synchronous motor accordingto the internal constraint condition under the condition of the magnetism loss fault; and constructing a magnetism loss fault simulator according to the parameters construction of the affected permanent magnet synchronous motor, and using the magnetism loss fault simulator to perform fault simulation.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a method, system and medium for simulating a loss-of-excitation fault of a permanent-magnet synchronous motor. Background technique [0002] The permanent magnet synchronous motor has the advantages of simple structure, small size, light weight, low loss, high efficiency, high power factor, etc. It is mainly used for the update of high-performance servo drive systems and DC motors that require fast response, wide speed range, and accurate positioning. Replacement motor. However, since permanent magnet synchronous motors use permanent magnets instead of excitation coils for excitation, the performance of permanent magnet synchronous motors is greatly affected by permanent magnets, and permanent magnets are prone to permanent magnet demagnetization failures due to the influence of electromagnetic fields. When a permanent magnet synchronous motor has a demagnetization fault, continu...

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Problems solved by technology

At present, the research on the simulation of permanent magnet synchronous motor loss of excitation usually assumes that all permanent magnets have the same degree of loss of excitation as the overall loss of excitation, and the research on the simulation of partial loss of excitation considering different degrees of permanent magnet loss at different positions is still rare.

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