| 摘要 |
PURPOSE:To improve regenerative braking performance increasing a number of rotations of torque decrease by a method wherein a field current control means is fed with a field current control limitter output as an input at a negative value for producing a constant torque according to a reference value of a regenerative torque. CONSTITUTION:A gate of a thyristor FTh is controlled to perform a constant current control by means of a field current control circuit and a field phase shifter 6 with the reference voltage and field current. If by a field current pattern 1 by which a field current reference value is set as the inputs. The torque outputs produced in a torque detecting circuit 2 having the currents Ia and If as inputs, and the outputs of a constant torque limitter 4 in high gain having a torque reference voltage from a torque pattern 3 as inputs are fed as the inputs to the field constant current control circuit 5. With the shift from (c) region control to (b) region control in regenerative braking, the reference value of the field current pattern 1 is decreased by the outputs of the constant torque limitter 4, an armature current flows more than a current in (a) region and is controlled to produce the same torque. |
