Controller for induction motors

摘要: Many induction motor controllers employ a reference angle relative to the supply voltage which is target for phase lag of current behind but choice optimum energy saving varies from motor. In present invention firing signals thyristors connected between and be controlled are generated by circuits under control microprocessor 18. The continuously adjusted according as indicated zero crossings sensing circuits, load on motor, signal indicating tendency stall obtained back e.m.f. Using said can regarded equivalent adjusting value mentioned above. A procedure starting setting initial also described.