A method for improving the performance and safety of synchronous reluctance and induction motors

This paper proposes an optimization method to increase the performance of synchronous reluctance and inductor motors (specific torque, efficiency, power factor) to theoretical limit at rated load and in the zone of fourfold phase current overload. The specific torque per unit mass with equal losses and thermal states of synchronous reluctance and inductor motors in comparison with the same indicator of an asynchronous motor in nominal mode lies in the range from -5 to 75 % and in 4-mode multiple overcurrent in the range from -36 to 66 %. Indicators for effective and maximum voltages for motors whose rotor speed is comparable to that of an asynchronous motor, are 10-45 % higher. This should be taken into account when designing an electrical converter, allowing for appropriate voltage reserves. In terms of the ratio of torque to effective and maximum voltage, synchronous reluctance and inductor motors are up to 3-6 times superior to asynchronous motors. An optimization criterion is proposed, equal to the ratio of the electromagnetic moment to the effective value of induction in the gap, which will allow, using finite element models and the optimization method discussed in the article, optimal synchronous reluctance and inductor motors from the point of view of electrical safety and losses in steel.