Triac Speed Control of Three-Phase Induction Motor with Phase-Locked Loop Regulation
- 1 September 1976
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Industry Applications
- Vol. IA-12 (5) , 492-498
- https://doi.org/10.1109/TIA.1976.349459
Abstract
The speed control of a three-phase squirrel cage induction motor by employing triacs in the lines which operate in the normal phase control mode is described. The inherent limitation of low circuit commutated (dv/dt), which makes the triac circuit somewhat unreliable, has been overcome by suitably designing the snubber circuit. The closed-loop speed regulation of the system is then investigated by employing digital phase-locked loop scheme. Compared to the conventional method with antiparallel SCR's and analog servo, the present scheme is somewhat simpler, more economical, and extreme precision in speed control is possible. A complete model of the speed control system has been designed and experimentally evaluated in the laboratory.Keywords
This publication has 4 references indexed in Scilit:
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- Phase-locked loops for motor-speed controlIEEE Spectrum, 1973
- The Analysis of Induction Motors with Voltage Control by Symmetrically Triggered ThyristorsIEEE Transactions on Power Apparatus and Systems, 1971
- Induction Motor Speed Control by Stator Voltage ControlIEEE Transactions on Power Apparatus and Systems, 1968