| 摘要 |
1,230,119. Acceleration and deceleration control systems. STANDARD TELEPHONES & CABLES Ltd. Nov.7, 1968, No.52771/68. Heading G1N. [Also in Division G3] In an acceleration or deceleration control circuit, the output from the collector of a transistor TR1, which, by reason of a differentiating circuit is made proportional to the acceleration or deceleration of a tachogenerator TG driven by an associated machine, is applied to transistors TR2, TR3, which each develop an output at its collector, a portion of the output from TR3 being fed back to TR1 via R2, C2, and R1 to increase the output of TR1. The time constant of C2 is longer than the time constant of any phase changing element in the circuit e.g. the solenoid of an electromagnetic clutch, such that for small variations in acceleration, the circuit has a rapid response, and for large variations the long term output of the circuit can adjust itself over a much wider range. The circuit may operate on an electromagnetic clutch or brake, via output terminals O1, O2. |
