| 摘要 |
1,130,591. Automatic current control. GENERAL ELECTRIC CO. Feb.24, 1966 [Feb.26, 1965], No. 8097/66. Heading G3R. [Also in Division H2]. A current regulator for a motor control system, e.g. of the type described in Specification 1, 073, 180, wherein motor current regulated at a given level by control of a voltage supply source 15 whose voltage limits are changed as a step function comprises means such as 50 or 55 responsive to the occurrence of an event for developing an open-loop signal; means 20 for summing said signal with a current-responsive signal derived from a feedback loop 35 to provide a feedback signal of preselected magnitude, and for comparing said feedback signal with a reference signal to derive an error signal of apreselected magnitude regardless of the magnitude of the motor current signal at the time of said event; and means for reducing the magnitude of said open loop signal at a controlled rate. The means 50 may be associated with the contactor controlling the step-function changes of the supply source 15, and the means 55 with a device responsive to wheel slip. Thus, if a large change in motor current is called for by a step-function change or by wheel slip for example, the open loop signal modifies the error signal applied to the source 15 so that the motor current builds up from one regulated value to another at a controlled rate, the motor current increasing as the open loop signal decreases. The rate at which the open loop signal decreases is determined by an R-C circuit associated with transistor circuitry, and a suitable arrangement is described with reference to Fig. 2 (not shown). |
