Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 39, Problem 10SQ
The speed of a synchronous motor is fixed by the
- a. rotor winding.
- b. amortisseur winding.
- c. supply voltage.
- d. frequency of power supply and number of poles.
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2P=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.
A three phase induction motor with supply frequency of 60 Hz, 8 poles. If the slip is 2.5 % at a certain load, determine (a) the synchronous speed, (b) the speed of the rotor (c) the frequency of the induced e.m.f in he rotor and (d) speed of the induction motor if the slip changes to 6 %
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Chapter 39 Solutions
Electric Motor Control
Ch. 39 - Prob. 1SQCh. 39 - What is the effect of the starting winding of the...Ch. 39 - What are typical applications of synchronous...Ch. 39 - Prob. 4SQCh. 39 - A loaded synchronous motor cannot operate...Ch. 39 - Why must a discharge resistor be connected in the...Ch. 39 - Depending on their power factor ratings, what is...Ch. 39 - At what power factor do incandescent lights...Ch. 39 - Prob. 9SQCh. 39 - The speed of a synchronous motor is fixed by the...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.Similar questions
- What are the advantages and disadvantages of using the following types of motors? shaded-pole motor PSC motor split-phase motor capacitor-start–capacitor-run motorarrow_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_forwardWhat is the typical speed regulation on a synchronous motor?arrow_forward
- What will be the effect of increasing the mechanical load on a synchronous motor? Assume the field current is kept constant. Explain using phasor diagramsarrow_forwardReview/Explain with the aid of sketches the following excitation methods for a synchronous motor. DC EXCITATION, DC BRUSHLESS, AC EXCITATION.arrow_forward3) 2P=4 pole 230V-60Hz three 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 that the motor will produce, ignoring the armature winding resistance.arrow_forward
- Y-1). A field-discharge resistor is installed in the rotor circuit of a 3-phase synchronous motor to....a) vary the speed of the motor b) limit the current in the amortisseur winding c) protect the wire-wound armature windings from excessive current during starting and shut-down. d) none of the above Y-2)._____________ is when a 3-phase synchronous motor has been overloaded to a point where it falls out of synchronism. a) Pullout torque b) De-phasing c) Single phasing d) none of the above Y-3). The power factor of a 3-phase synchronous motor can be varied by adjusting the_________a) speed b) horsepower rating c) DC field excitation d) all of the above Y-4) A 3-phase synchronous motor can have a leading power factor. a) true b) false Y-5). Given a constant field excitation, what is the effect on the power factor of a 3-phase synchronous motor with an increasing load? a) the power factor stays the same b) the power factor improves c) the power factor gets poorerarrow_forward1-what is the block rotor test of three phase induetion motor? 2-draw the equirlent circuit of block rotor test? 3-what are losses in block rotor test of 3-PH induction motor?arrow_forwarda. Explain the principle of operation of a shunt DC motor b. Give a brief description of a Synchronous Generator with round rotor.arrow_forward
- Q25)I) i) Explain why the rotor speed of induction motor is less than the Synchronous Speed?arrow_forwardA 480 V, 50 Hz, 100 HP 4-pole three-phase asynchronous motor has a slip of 3% at full load.According to this:a. Synchronous speed and rotor speedb. velocity in the air gapc. Find the rotor circuit frequency?arrow_forwardP-1).. Which of the following determine the amount of torque produced by a single-phase split-phase motor? a) The strength of the magnetic field of the stator b) The strength of the magnetic field of the rotor c) The phase angle difference between the current in the start winding and the current in the run winding d) all of the above P-2). The phase angle difference between the currents in the start winding and run winding of a single-phase split-phase motor is typically 90 degrees. a) true b) false P-3). A centrifugal switch is used to disconnect the________ winding of a non-hermetically sealed single-phase split-phase motor at approximately 75% of rated speed. a) run b) start c) either "a" or "b" d) neither "a" nor "b" P-4). Where an internal centrifugal switch cannot be used, an external______ relay can be used to perform the same function in a single-phase split-phase motor. a) hot-wire b) current c) solid-state starting d) all of the abovearrow_forward
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