Speed Control

Applications of Electric Drives

Applications of Electric Drives: The industrial Applications of Electric Drives are numerous. To arrive at a particular motor of suitable size for a given application, a knowledge of the following is very much necessary: The torque-speed curve of the industrial load is required. This fixes up the type of motor required to drive the load. […]

Transfer Function of Armature Controlled DC Motor

Transfer Function of Armature Controlled DC Motor: The speed of a dc motor can be controlled by varying the voltage applied to the armature of a dc motor. A separately excited dc motor with variable armature voltage finds application as a drive motor in a variable speed drive. The variable armature voltage is provided by […]

Closed Loop Control of DC Motor

Closed Loop Control of DC Motor: Closed Loop Control of DC Motor – The dynamic behaviour of a system is described by a set of differential equa­tions. On many occasions the solution of these equations requires the evalu­ation of convolution integrals which may be a difficult task. In such cases a simpler analysis is made […]

Synchronous Speed on Variable Frequency Supply

Synchronous Speed on Variable Frequency Supply: As has already been discussed, the speed of a synchronous motor can be varied by supply frequency variation similar to an induction motor. The applied voltage must be varied in this case also to have the maximum torque capability and to avoid saturation at all frequencies. A Synchronous Speed […]

Speed Control Using Slip Energy Recovery Schemes

Speed Control Using Slip Energy Recovery Schemes: The foregoing discussion makes it very clear that the methods of voltage control and rotor resistance control have poor efficiency, particularly at low speeds, and find limited application. The Slip Energy Recovery Schemes is wasted in the rotor resistance, either inherent in the rotor (high resistance rotors for […]

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