| 摘要 |
PURPOSE:To increase the torque when the constant current of the commutatorless motor is accelerated while in operation, to improve the power factor as well as to prevent the failure of commutation due to insufficient marginal angle for the titled circuit by a method wherein the period of inverse voltage is uniformly controlled. CONSTITUTION:The following is the explanation for a V-phase gate command signal generating circuit. The one-shot multivibrator 12, which was triggered by the U-phase inverse voltage signal S3 detected from a U-shape thyristor both terminal voltage waveform Eu, generates a described T1 period reference voltage signal S12, and integrates (S5) the differential voltage between the actual voltage period and the above reference voltage signal S12 through the intermediary of an integrator. The Z-shaped distribution signal S4, which leads 60 degrees in electrical angle, is integrated (S7) by an integrator 16, the result of which is inputted to a comparator 20 and compared with the above signal S5. The set output of the filp-flop 21, which was set by a comparison output S13, is turned to a V-phase gate command signal S9. The flip-flop 21 is set by a W-phase gate command signal S8, and the integrator 16 is short-circuited by the switch element 17 which turns to ON position after a fixed period of time has passed from the moment when the signal 9 was outputted. |
