Self-checking device of motor open loss and application method thereof

Abstract

The invention relates to the field of emergency protective circuit devices which react to overcurrents, in particular to a self-checking device of a motor open loss and an application method thereof. The self-checking device of the motor open loss includes current sensors (1) and is characterized by further including a motor controller (2) and an angle sensor (3), and the current sensors (1) and the angle sensor (3) are both connected with a microprocessor (21) through signal lines. The application method of the self-checking device of the motor open loss is characterized in that when a motor (4) stops working, the steps of a) inputting parameters, b) processing the parameters, c) modulating voltages and d) judging an open loss are performed sequentially. The self-checking device of the motor open loss is simple in structure, convenient to install, quick in response, safe, reliable, and wide in range of application.

Description

technical field [0001] The invention relates to the field of emergency protection circuit devices reacting to overcurrent, in particular to a self-checking device for motor phase loss and a use method thereof. Background technique [0002] At present, new energy vehicles are being widely used. New energy vehicles are generally driven by synchronous motors. The direct current output by the battery pack is converted into three-phase alternating current by the inverter and then input to the synchronous motor. The synchronous motor drives the car. At the same time, it is equipped with Motor controllers to control the operation of synchronous motors. In actual use, the synchronous motor may be out of phase due to installation problems or damage to the main circuit. The lack of phase operation may not only lead to demagnetization of the motor, but also bring hidden dangers to safety. Most of the existing phase loss protectors use a special device for monitoring the output state o...

AI Technical Summary

Problems solved by technology

In actual use, the synchronous motor may be out of phase during operation due to installation problems or damage to the main circuit. The lack of phase operation may not only lead to demagnetization of the motor, but also bring hidden dangers to safety.

Most of the existing phase loss protectors use a special device for monitoring the output state of the inverter in the output circuit to judge whether there is a phase loss. It needs to be monitored by detecting the current after the motor is started, and there is a certain hysteresis. For low-speed And it is difficult to respond in a timely manner in areas with high torque response requirements, and the addition of equipment leads to complex structures. At the same time, output voltage detection with high precision requirements is required, which increases the cost and makes installation difficult.

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