Intelligent remote motor monitor

Abstract

An intelligent remote motor monitor comprises a current transformer and a magnet exciting coil and is characterized in that the output end of the current transformer is connected with the input end of a digital signal processing circuit with a wireless module; the output end of the digital signal processing circuit is connected with a control circuit of a motor electric equipment; the output end of the control circuit is connected with the magnet exciting coil; the digital signal processing circuit is also connected with a display circuit with keys. The circuit sampling design of the invention is subject to digital circuits, thus avoiding the defects of poor anti-interference of pure simulation circuits, low protection sensitivity and poor protection reliability caused by judging whether the three-phase mains lack phase and incapability of changing the protection time according to the field conditions. The monitor also has the characteristics of high reliability, practicality, safety and reliability, simple and reasonable structure, convenient installation, use and maintenance, wide application range and low production operation cost, and has the characteristics of alleviating labor intensity of workers, immediately finding out problems and solving problems and facilitating inquiring historical data, etc.

Description

technical field [0001] The invention belongs to the technical field of electromechanical control systems, in particular to an intelligent remote motor monitor for remotely monitoring the running state of a motor and controlling the motor according to the running state. Background technique [0002] The motor protectors in the prior art usually perform phase loss and overcurrent protection, and there are many kinds of motor protectors with different structures. Among them, the phase loss and overcurrent protection of the motor use analog circuits. One of the characteristics of the analog circuit is that it has poor anti-interference performance. The circuit delay is set by the characteristics of pure analog circuits, and the modifiability is poor. Decrease, so that the protection circuit will take corresponding actions to cut off the power supply of the motor. Because the motor runs under the condition of lack of phase, the current of the lack of phase is not zero. When the ...

AI Technical Summary

Problems solved by technology

Among them, the phase loss and overcurrent protection of the motor use analog circuits. One of the characteristics of the analog circuit is that it has poor anti-interference performance. The circuit delay is set by the characteristics of pure analog circuits, and the modifiability is poor. Decrease, so that the protection circuit will act accordingly and cut off the power supply of the motor

Because the motor runs under the condition of lack of phase, the current of the lack of phase is not zero. When the load of the motor is small, the difference between the current value of the lack of phase and the current value of other phases is not obvious, which may easily cause the protection action of the motor protector to be insensitive. , the phase loss protection of the motor is not very reliable, and remote monitoring cannot be realized

Images