Rotational speed control system of power motor

Abstract

The invention discloses a speed control system for an electric motor, comprising a hall sensor module, a voltage-frequency conversion circuit, an isolation module, a single chip, a signal modulation circuit, a buffer, an interface circuit and a circuit breaker. The hall sensor module sequentially passes the voltage The frequency conversion circuit, the multi-way switch, and the signal modulation circuit are connected to the single-chip microcomputer. The single-chip computer is also connected to the memory, the buffer and the interface circuit. The memory is also connected to the buffer. The interface circuit is also connected to the sound and light alarm module, display module, printer and circuit breaker. The power motor speed control system of the present invention uses an isolation module for voltage isolation, and uses a single-chip microcomputer for data processing, speed display, over-limit alarm and control circuit breaker opening, thereby realizing real-time monitoring of the power motor speed. The system has a simple structure and low cost. small volume.

Description

Technical field [0001] The invention relates to a control system, in particular to an electric motor speed control system. Background technique [0002] The safe operation of the power system is related to the development of the entire national economy and the stability of people's lives. However, there are many factors that affect the safe operation of power systems, and one of the important aspects is the safe operation of electrical equipment itself. Since most electric motors adopt a closed structure, the heat dissipation effect is poor, the heat accumulation is large, and they are operated at high voltage, high current and full load for a long time. As a result, the heat buildup increases. The motor speed directly determines the temperature rise, and the temperature rise Directly endanger the electrical insulation of electrical equipment. With the increase in voltage and capacity of generator sets in power plants, the problem of monitoring motor speed is becoming increasin...

AI Technical Summary

Problems solved by technology

However, in actual monitoring, it is necessary to require voltage isolation between the monitoring object and the monitoring instrument. At the same time, it is also limited by the location of the temperature measurement point and the interference of strong electromagnetic fields. The effective transmission of the test signal has always been a problem that is difficult to properly solve.

Although foreign countries use infrared thermal radiation and other technologies to measure the temperature of electrical equipment with remote sensing online, its structure is complex and expensive, and it cannot directly solve the real-time monitoring of motor speed.

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