Step motor control system including a three stage energization for each step

Tape transports including zero beat response in stepping motor systems

System, apparatus and method for improving stability of synchronous machines

895,476. Automatic control systems for power stations operating in parallel. GENERAL ELECTRIC CO. Feb. 10, 1960 [Feb. 12, 1959; April 30, 1959], No. 4672/60. Drawings to Specification. Class 38 (4). In an apparatus for computing the most economic method of generating and transferring power between a plurality of local transmission systems one of the local systems acts as a reference to which all the other local systems are compared, and a plurality of signals are generated, each representing the amount of power to be exchanged between each of the local systems and the reference system. The means at each local system has signals fed to it representative of the difference between power generated and power consumed, which means produces a signal representative of the incremental cost of power, the means being in two parts, which delivers a signal appropriate to whether power is to be imported or exported. The signals representative of the power to be exchanged to bring the system into economic balance may be relayed manually to each local system by a despatcher at the reference point, or by means of comparators having signals fed to them representative of the actual and most economic power generation, an error signal is derived which conrols the generated power in each local system automatically. The incremental cost signals may be modified to allow for the cost of transmission losses. Specification 866,271 is referred to.

Electrical power computer apparatus

A method of controlling a motor in which an elastic element is coupled in a sub-critically damped manner to the load and the natural frequency of the system which comprises the elasticity of the element and the mass of the driven part is utilized to cause the speed of the load to increase and to decrease as quickly as possible.

Method of controlling an electric motor

Electrical servo system

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Electrical servo system