А TEST BENCH FOR SENSORLESS CONTROL OF THE LOAD TORQUE OF A BRUSHLESS DC MACHINE

The concept of constructing a load stand for a brushless DC motor using an induction motor fed by an industrial frequency converter with vector control and the possibility of torque control was considered. This eliminates the use of a torque sensor, reduces the cost of the system and simplifies the design of the electromechanical part of the test-bench. It should be noted that this stand can also be used to study the characteristics of a brushless DC motor when operating in generator mode, in contrast to the torque sensor, which cannot be used as a drive motor. In the first part, a mathematical model of the mechanical part of the system of a brushless DC motor loaded by a vector-driven asynchronous machine is derived. In the second part, automatic tuning is performed to determine the parameters of the ST80LB type induction motor required to put the F7Z6 type frequency converter into direct torque control mode. At the end of this article, the frequency converter with vector control is transferred to the direct torque control mode. The procedure for automatic tuning and transfer the frequency con-verter to direct torque control mode can also be useful as a guideline for the «Racurs» Laboratory.

Authors: F. Sh. Al-Mahturi, D. V. Samokhvalov, A. I. Jaber, N. I. Tatarintsev

Direction: Electrical Engineering

Keywords: Brushless DC motor, load test-bench, automatic tuning, torque control, load torque, asynchronous motor

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