Selection of Electric Drive: For selection of electric drive motor it is essential that the conditions of service are well known. It is not sufficient to simply specify the output power in kW and the…
Types of Electric Drives: The various types of electric drives used in industry may be divided into three types, namely Group Drive, Individual Drive and Multi-motor drives. 1. Group Drive: By group drive is meant…
Nature of Electric Supply: The nature of electric supply available may be 3-phase ac, single-phase ac or dc. In case three-phase ac supply is available, polyphase induction motor, squirrel cage type for small ratings and…
Factors Governing Selection of Electric Motors: Parallel to the growth of machine tools, an equally rapid progress has been made in the field of electric motors. The electric motors of various designs are available to…
Special Features of Thyristor Drive Motors: The most commonly used dc motors for thyristor drive are separately excited and series excited dc motors. The thyristor drive motors usually differ from conventional dc motors in construction.…
Speed Control of DC Motor using Feedback Loop: An open-loop system can be converted into a closed-loop system by employing a speed control of dc motor using feedback loop, as illustrated in Fig. 3.29. The…
Electric Braking of Separately Excited DC Motor: The electric braking of separately excited dc motor is show in Figure 3.31. Figure 3.31 (a) illustrates a simplified representation of a single phase fully controlled rectifier supplying…
Thyristor Control of 3 Phase Synchronous Motor: The synchronous motor is a constant speed motor and it develÂops torque only at synchronous speed which is directly proportional to supply frequency. Therefore, variation of frequency of…
Speed Control of Single Phase Induction Motor using Triac (Fan Regulator): The conventional speed regulator for a fan uses a resistance regulator. The regulator resistance is in series with the fan motor. The speed of…
Protective Devices and Interlocks: Protective devices must be incorporated in the control circuit (or circuits) to interrupt the flow of current to the motor to guard against overloads or other conditions dangerous to the motor…