Abstract
The electromagnetic torque developed in permanent magnetic synchronous motor drives is analyzed and discussed accounting for different motor structures. An electromagnetic model has been developed and used in digital control to obtain an optimal torque: maximal mean torque free of pulsation for a given current. This is obtained by imposing a minimized instantaneous current in the motor accounting for actual motor flux distribution which is the cause of torque pulsations. The model uses the finite elements technique to determine the motor parameters and an iterative procedure to predetermine the adequate current reference. Different motor structures have been studied and an experimental verification for one of them is given. induction motor servo drive system is presented. An experimental indirect field-oriented induction motor drive system is implemented, and its dynamic model is built up using stochastic techniques. To obtain good dynamic responses both in the position command tracking and load regulation characteristics, a position servo controller with two degrees of freedom is proposed. The parameters of the controller are found using a systematic design procedure according to the given drive specifications. The theoretic basis of the design procedure is developed in some detail. Having tested the performance of the controller by simulation, the microcomputer-based realization of the designed controller has been successfully implemented. some experimental results are given to demonstrate the effectiveness of the proposed position servo controller.