Speed Control of Large Induction Motors by Thyristor Converters
- 1 September 1969
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Industry and General Applications
- Vol. IGA-5 (5) , 545-551
- https://doi.org/10.1109/TIGA.1969.4181069
Abstract
An efficient method for achieving continuously variable speed control of slip ring induction motors with fan-type load is described in which the motor slip is controlled by a thyristor converter. By means of motor winding tap changes, the rating of the thyristor converter is reduced to a fraction, typically one third, of the motor. The reactive kVA associated with the converter is similarly reduced and the system full-load power factor is ideally 0.95. The motor starting current is controlled to be about one third of rated current. The scheme enables the initial cost of solid-state speed controls for large motors to be competitive with existing methods and additionally offers greater reliability, efficiency, and versatility, as well as reduced operating costs. The techniques discussed are especially suitable for motors ranging from tens to thousands of horsepower.Keywords
This publication has 1 reference indexed in Scilit:
- Induction Motor Speed Control with Static Inverter in the RotorIEEE Transactions on Power Apparatus and Systems, 1966