Abstract
This paper presents a few aspects regarding the analysis of some dynamic regimes of asynchronous motors supplied at variable frequency. In this purpose, in the first part of the paper, there are detailed the Simulink blocks of a program for simulating the operation of driving systems with static converters with precomputed commutation moments. Then there are presented the simulations obtained with the help of this program in case when the supply frequency is modified by jump. The accent is laid on the rate of time-dependent variation of the stator current. The results obtained are compared with the experimental results obtained with the help of a high-speed data acquisition board. The paper ends with conclusions and references.
Highlights
The problem of optimal control of an asynchronous machine is a very present one; this fact is confirmed by several papers published in outstanding reviews [2], [7], [10] etc. and presented in important international conferences [1], [5], [6], [9], [11], [14] etc.In comparison with other types of control, PWM control has the advantage that the motor current has a lower content in harmonics, fact materialized in a decrease of the supplementary losses, of the torque pulsations etc.Along the time there have been formulated a lot of modulation strategies, both analogical and numerical
Running the program detailed before, for several particular values of the parameters of an asynchronous motor rated at 1,2 kW, the graphics from figures 6 and 7 have been obtained
The analysis carried out in this paper has aimed at studying the influence of some parameters of asynchronous motor on the dynamic regimes obtained for the case when the supply is ensured by PWM frequency converters
Summary
The problem of optimal control of an asynchronous machine is a very present one; this fact is confirmed by several papers published in outstanding reviews [2], [7], [10] etc. and presented in important international conferences [1], [5], [6], [9], [11], [14] etc. The problem of optimal control of an asynchronous machine is a very present one; this fact is confirmed by several papers published in outstanding reviews [2], [7], [10] etc. In comparison with other types of control, PWM control has the advantage that the motor current has a lower content in harmonics, fact materialized in a decrease of the supplementary losses, of the torque pulsations etc. The precomputed PWM modulation for harmonics elimination has imposed; in this case, the commutation moments are established analytically, they are memorized and read with variable frequency. It must be emphasized that, owing to the type of the stator winding connection of asynchronous motor, the harmonics which are multiple of three will not occur in the current curve, fact that does not impose supplementary measures for decreasing them
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