| 摘要 |
<p>1,108,049. Control of D.C. motors. BADISCHE ANILIN- & SODA-FABRIK A.G. 6 July, 1965 [7 July, 1964], No. 28513/65. Heading H2J. A valve positioning motor M of low inertia is energized from an A.C. source with trains of D.C. pulses through one or the other of two thyristors St1, St2, according to direction of rotation, triggering being effected by circuits I, II in response to signals from an electronic regulator R, the triggering circuits being switched to their non-triggering state when the charge on a capacitor C1 or C2 balances the signal from R; the capacitor is charged by the rectified A.C. component of the pulsed D.C. motor current. Charge rate is adjustable by a rheostat R1 or R2 and discharge is through a second rheostat between 6, 7, the triggering circuit switching back to the triggering condition when the charge drops below the regulator signal. The motor torque can be different in each direction, by energizing the respective thyristors from separate transformer windings, and a battery may be automatically connected to the motor to drive the valve to one end of its travel in the event of failure of the normal supply, (Fig. 3, not shown). Provision is made for manual operation of the valve.</p> |
