Abstract
Thermal protection is one of the most important aspects of the motor control system. Any thermal protection system performs two functions: it continuously monitors the current temperature of the protected electrical equipment and disconnects it from the network when the maximum heating is reached. In this paper, special attention is paid to the first of these functions. A general classification of the thermal control methods for electrical equipment windings is proposed, and ways of their practical implementation are shown. The results of developing a thermal protection system are presented that implements a temperature control method based on calculating the active resistance of an asynchronous motor (AM) winding using experimental data obtained in real time directly during the AM operation. The developed circuit ensures minimal influence of the control circuit on the operational parameters of the entire system as a whole by reducing the measuring shunt influence in the electric motor stator circuit. Considering that temperature processes are characterized by relatively high inertia, it is proposed to implement the process of measuring information signals with a certain rate. The algorithm of this connection is shown depending on the heating conditions of the AM during operation. An automated control system for the AM has been developed using the developed method of thermal protection, the control of which is carried out by a microcontroller. A generalized block diagram of this system is given, time diagrams of the timers operation are shown depending on the AM operating modes. The developed overheating protection system can be used both to protect the AM and to provide thermal protection of other AC electrical devices.
Keywords
vibration sensor, measuring coil, inertial element, elastic suspension, turn-to-turn capacitance of the winding, coupling capacitors of measuring coils with supply voltage, bridge measuring circuit, resonance, quadrature detection
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