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Motor protectorAlso called a motor protector, its function is to provide comprehensive protection for the motor. It is a device that gives an alarm or protection when the motor has overtime start, overcurrent, undercurrent, phase failure, stall, short circuit, overvoltage, undervoltage, leakage (grounding), three-phase imbalance, overheating, bearing wear, stator and rotor eccentricity, external fault, power supply self-start, and inverse time limit. So what is the working principle of the motor protector? The following is a detailed introduction.

Motors are damaged due to electrical reasons such as overload, phase loss, short circuit between layers and lines, ground leakage of coils, instantaneous overvoltage inflow, etc., or due to mechanical reasons such as stalling, when the motor rotating body encounters solids, heat conduction occurs due to bearing wear or lack of lubricating oil, and the motor is damaged. Abnormal operation or stoppage or damage will cause production losses or manpower losses during the stoppage time that cannot be compared with the cost of replacing the motor itself. The loss is huge, so we need to effectively protect the motor to ensure the normal operation of production.

Motor protectorFor faults caused by electrical reasons, whether it is overcurrent or overvoltage, it is mainly because the current increases instantly and exceeds the load current value of the motor, causing damage. Based on this principle, the motor protector protects the motor by monitoring the current value changes of the two-phase (three-phase) circuit of the motor. For overvoltage and low voltage, the motor is protected by detecting the voltage changes between the motor phases. Its basic principle and working process: The sensor reflects the current changes of the motor linearly to the sampling port of the protector. After rectification, filtering and other links, it is converted into a DC voltage signal proportional to the motor current, sent to the corresponding part for comparison and processing with the given protection parameters, and then processed by the single-chip circuit to drive the power circuit to make the relay operate. When the motor current increases due to the overload of the drive part, the voltage signal obtained from the current sensor will increase. When this voltage value is greater than the setting value of the protector, the overload circuit works, and the RC delay circuit drives the output relay to operate after a certain (adjustable) delay, so that the contactor cuts off the main circuit. The working principles of the functional parts such as undervoltage and phase loss protection are basically the same.

Changzhou Ainuo Electronic Technology Co., Ltd. is a professional manufacturer and sellerMotor protectorWe are an enterprise with many years of experience in producing motor protectors. Our current products include motor protectors, motor protectors, ptc electric heaters and other products. The qualified rate of our products is as high as 99%. If you have any needs, please feel free to consult us!