Variable Reluctance Stepper Motor Working Principle: A Variable Reluctance Stepper Motor Working Principle consists of a single or several stacks of stators and rotors-stators have a common frame and rotors have a common shaft as shown in the longitudinal cross-sectional view of Fig. 10.34 for a 3-stack motor. Both stators and rotors have toothed structure …
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Blocked Rotor Test of Induction Motor: This Blocked Rotor Test of Induction Motor is used to determine the series parameters of the Circuit Model Parameters of an induction motor. The circuit is similar to that of a transformer short-circuit test. Short circuiting the load resistance in the circuit model of Fig. 9.8 corresponds to making …
No Load Test of Induction Motor: In this No Load Test of Induction Motor, the motor is run on no-load at rated voltage and frequency. The applied voltage and current and power input to motor are measured by the metering as per Fig. 9.17. Let the meter readings be Power input = P0 (3-phase) Current …
Motor Protection: Motor Protection – There is a wide range of motors in existence for various purposes. However, the fundamental problems affecting the choice of protection are independent of the type of motor and the type of load to which it is connected. The motors under discussion here are a.c. motors which include synchronous motors …
Important Questions of Characteristics of Electric Motors: Problems of Characteristics of Electric Motors: 1.A 50 hp, 220 V, 1200 rpm dc shunt motor has an efficiency of 85% at full load. The shunt field resistance is 110Ω and the armature circuit resistance is 0.06Ω. This motor is required to drive a load requiring 120% of …
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Stepper Motor and Switched Reluctance Motor Drives: Advantage and Disadvantage of Stepper Motors : Advantage and Disadvantage of Stepper Motors are as follows; Advantages They are compatible with digital systems and do not require digital to analog conversion at the input, as do conventional servos, when used with digital systems or a computer. While simple …
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Synchronous Motor and Brushless DC Motor Drives: Brushless DC Motor Drives (Trapezoidal PMAC): The cross section of a 3-phase 2 pole Brushless DC Motor Drives is shown in Fig. 7.15. It has permanent magnet rotor with wide pole arc. The stator has three concentrated phase windings, which are displaced by 120° and each phase winding …
Induction Motor Drives: Braking of Induction Motor Drive : Following methods are employed for Braking of Induction Motor Drive: Regenerative braking Plugging or reverse … Braking of Single Phase Induction Motor : These motors can be braked by dc dynamic and plugging. The Braking of … Closed Loop Speed Control of Induction Motor Drives : A …
DC Motor Drives: Armature Voltage Control using Transformer : Variable voltage for the dc motor control can also be obtained by either using an auto-transformer or a Armature … Chopper Control of Separately Excited DC Motor : Motoring Control : A transistor Chopper Control of Separately Excited DC Motor drive is shown in Fig. … …
PWM VSI Squirrel Cage Induction Motor Drive: The PWM VSI Squirrel Cage Induction Motor Drive is shown in Fig. 10:24. dc link is supplied from ac source through a transformer and a diode rectifier. Because of the use of diode rectifier, regenerative braking is not possible, hence dynamic braking is employed. Operation of drive is …