Electric Motor Control
10th Edition
ISBN: 9781305177611
Author: Herman
Publisher: Cengage
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Chapter 55, Problem 1SQ
To determine
Explain the operating principle for all three-phase motors.
Expert Solution & Answer
Explanation of Solution
Discussion:
The three-phase AC motors work on the principle of rotating magnetic field (RMF). When the three-phase supply is connected to stator of the motor, the three-phase currents induce the three flux waves. The fluxes interact with each other and produce the RMF. The speed of the RMF is a synchronous speed.
The synchronous speed of RMF depends on the number of poles per phase and the applied voltage’s frequency. The electromotive force (EMF) is induced in the rotor conductors due to the RMF. The induced EMF on the rotor leads to the flow of current in the rotor conductors, and subsequently rotor torque is produced. The rotor rotates in the direction of RMF due to the rotor torque.
Conclusion:
Thus, the operating principle of all three-phase motors is explained.
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Electric Motor Control
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- A three-phase, 60-Hz induction motor runs at 890 r/min at no load and at 840 r/min at full load. (a) How many poles does this motor have? (b) What is the slip at rated load? (c) What is the speed at one-quarter of the rated load? (d) What is the rotor’s electrical frequency at one-quarter of the rated load?arrow_forward⦁ Explain why single phase Induction motor is NOT self-starting?arrow_forward2P=4 poles 230V-60Hz three phase round rotor synchronous motor is star connected. The synchronous reactance of the synchronous motor is j5 ohm/phase, the induced voltage at the beginning of the phase is 200V, and the power angle is 30. Calculate the power and torque produced by the motor, ignoring the armature winding resistance.arrow_forward
- What are the different applications of split-phase motor?arrow_forward2P=4 poles 230V-60HZ 3-phase round rotor synchronous motor is star connected. The synchronous reactance of the synchronous motor is j5Ω/phase, the voltage induced at the beginning of the phase is 200V, and the power angle is 30. Calculate the power and torque produced by the motor, ignoring the armature winding flux resistance.arrow_forwardQ4. 1- What is the main function of a diverter used in series wound DC motor? 2- What is the main difference between (iron and friction losses) and copper (Cu) losses in DC generators?arrow_forward
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