HEAT AND ELECTRIC MATHEMATICAL MODEL FOR ASYNCHRONOUS ELECTRIC MOTORS
This paper presents the modeling and testing of thermal, electrical and mechanical properties, models of three-phase asynchronous motor (TIM). The relationships between losses and temperature changes at TIM are considered, which makes simulation of motor operation predictable. In determining the loss at the TIM equivalent electric circuit in an arbitrary, a reference system is used, which combines the traditional model with more conventional modeling and takes into account losses in the stator iron. Thermal study of the engine is performed using an equivalent thermal circuit formed by thermal capacitances and thermal conductivities, which are separately considered for the stator and rotor. Losses calculated using electrical and mechanical modeling are input parameters for the thermal model.
Given the current growing cost of electrical energy and its limited availability, energy efficiency optimization has been the subject of intense research.
The greatest amount of energy in electric transport absorbs electric motors. This consumption is from 65% of electricity used in industry.
One way to maximize the effectiveness of TIMS can be done by improving existing technologies. In the development of control systems for the TIM drive, mathematical models are used, which include the simulation of electrical and mechanical parts in TIM.
One of the main limitations of control strategies is the efficient use of energy and the optimization of sensors.
The increase in temperature TIM due to losses in the car. Therefore, to derive a moderate temperature and estimate engine losses, it is necessary that the models include all the factors that generate them. Thus, it is possible to establish a correspondence between the electrical, mechanical and thermal models.
While the first two are used to determine losses in the rotor and the stator, the third gives the temperature value. The resistance value will be evaluated in the rotor and stator, the parameters of which will experience a greater change associated with temperature.
The thermal model of an asynchronous electric motor, presented in this article, also takes into account the mechanical losses responsible for increasing the temperature of the engine.
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