Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Textbook Question
Chapter 43, Problem 3SQ
Why is the shunt field circuit never allowed to open while operating?
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A step up chopper has an input of 200 volts and output of 250 volts. The blocking period is each cycle is 0.6x10-3 seconds. Find the period of conduction in each cycle and frequency of operation?
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- Explain why the use of switching drives can be problematical when driving an inductive load, and how any problems may be overcomearrow_forwardThe preferred method for applying the field excitation voltage uses a field relay which operates on the principle of A. speed application. B. time application.C. angle application. D. thermal application.arrow_forwardCalculate the reactance voltage for a machine which runs at 900rpm number of commutator segments is 65, brush width is 1.74 (in commutator segments), coefficient of self induction is 153 the conductor current is 27A.arrow_forward
- The voltage drop at brush- commutator contact is variable (1-2V) .and dependent of armature current True O False Oarrow_forwardA DC machine with 2 poles, wave winded (retrogressive) (two layers) with 18 slots, the values of pole pitch and commutator pitch arearrow_forward1. It is a machine that converts mechanical energy to electrical energy. 2. It is a machine that converts electrical energy to mechanical energy. 3. It is cylindrical or drum-shaped where the coils are placed and can either be lap wounded or wave wounded. 4. It connects the commutator to the other parts of the DC machine. 5. It serves as the housing of the dc machine. 6. True or False: The shunt field winding is part of the armature. 7. True or False: The long shunt compound generator is when the armature is in series with the series field winding and parallel to the shunt field winding. 8-10. Your newly built house needs an elevator. Which from the following will be best to use- series, shunt or compound motor and why?arrow_forward
- Answer Letter C only.arrow_forwardThe armature circuit of a free excited direct current motor with a nominal voltage of 600 V is fed from an adjusted direct voltage source. The excitation circuit is also powered from a regulated voltage source. It is used in an application that requires motor speed adjustment. The speed of the motor at the nominal armature voltage was measured as 1600 rpm. All losses of the motor and voltage source and the effect of armature reaction are neglected. It is accepted that the engine is not saturated.Answer the questions below.a) Draw the armature and excitation circuit of the motor and write the formulas for the equivalent circuit.b) If the load moment of the motor at the nominal armature voltage is 420 Nm, then calculate the armature current and the input power of the motor.c) If the armature voltage of the motor is kept constant at 600 V and the excitation current is decreased until the speed reaches 4000 rpm, then calculate the shaft moment. Show this working area on the M = f (W) axis.arrow_forwardExplain how a direct online (DOL) magnetic starter works with diagrams and picturesarrow_forward
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