| 摘要 |
<p>932,172. Control of A.C. motors; controllers. S.A. DES ATELIERS DE SECHERON. May 6, 1960 [May 28, 1959], No. 16144/60. Class 38 (3). The voltage applied to a traction motor 1 during starting is determined by a tapped transformer 2 associated with a voltage regulator 3 and a vibrating relay 5, the relay being controlled by a self-excited transductor 4 acting as a pulse generator. The periods of the pulses decrease as a function of the difference between the motor current and a fixed reference current, the latter representing the maximum starting current of the motor. Thus, the notching-rate of the transformer is high when there is a large current-difference, and is low when the motor current approaches its maximum value. If the current exceeds the prescribed maximum value, the notching operation is suspended. The transductor may have a control-current winding, a polarizing winding, and a further input winding which is energized in accordance with the output voltage of the transductor. A supplementary control winding is provided for rapidly reducing and increasing the output of the transductor when the relay is energized and de-energized respectively.</p> |
