COMPENSATION OF THE INFLUENCE OF AMBIENT TEMPERATURE ON THE CHARACTERISTICS OF THE BRUSHLESS PERMANENT MAGNET SERVOMOTOR
The influence of the ambient temperature on the mechanical characteristics of the brushless permanent magnet servomotor is studied by calculating the design of a synchronous motor with a collector-type inductor based on a one-dimensional nonlinear model of the magnetic system. As a result of the study, it was found that the temperature change in the range from –60 °C to +80 °C leads to a decrease in the starting torque by 2.4 times and an increase in the idle speed by 1.4 times. Thus, the average stiffness of the mechanical characteristics is reduced by about 3.3 times, which significantly affects the dynamics of the engine, especially in the area of loads close to the nominal and below. The efficiency of thermocompensation implemented by the inclusion of thermistors in the power supply chain is also studied, and it is found that this method can significantly reduce the influence of temperature on the dynamics of the engine in the area of loads above the nominal, while at low loads there is a overcompensation, which in practice, obviously, can be eliminated by correcting the characteristics of the thermistor using external nonlinear elements.
Authors: A. A. Usoltsev, D. S. Vdovichenko
Direction: Electrical Engineering
Keywords: Brushless permanent magnet servomotor, mechanical characteristic, electromechanical time constant, thermal stability, thermal compensation, thermistor
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