For a three phase synchronous motor, answer the following:Why it is not self-starting? List the methods of starting it?Draw its phasor diagram when working on a constant load, over excitation ?Explain how you can reduce hunting in it?Draw its V-curves and inverted V-curves?9Explain how you can use it as a synchronous condenser ?

Answered: For a three phase synchronous motor,…

Electric Motor Control

10th Edition

ISBN:9781133702818

Author:Herman

Publisher:Herman

Chapter39: Synchronous Motor Operation

Section: Chapter Questions

Problem 3SQ: What are typical applications of synchronous motors?

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L-1). How would it be possible to reverse the direction of rotation of a 3-phase synchronous motor? a) reverse the polarity of the DC field excitation b) interchanging any two of the incoming supply lines c) interchanging all three of the supply lines d) none of the above L-2). The amortisseur winding of a 3-phase, synchronous motor is the.....a) squirrel-cage winding on the rotor used to start the motor b) wire wound winding on the rotor to be connected to the external DC supply by way of slip rings and brushes c) either "a" or "b" d) neither "a" nor "b" L-3). Is it ok to have the DC voltage supply connected to the rotor of a 3-phase synchronous motor while starting? a) yes b) no
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?
51. When a synchronous motor is said to be ... A) over-excited, it is operating at a a) lagging power factor b) unity power factor c) leading power factor d) none of the above B) under-excited, it is operating at a a) lagging power factor b) unity power factor c) leading power factor d) none of the above C). What is a typical slip of a synchronous motor? a) 0% b) 2-5% c) 7-9% d) none of the above D). Selsyn motors can be used to a) provide position control b) provide angular feedback information c) both "a" and "b" d) neither "a" nor "b"
2.. A three-phase 60 Hz asynchronous motor runs at 890 rpm at idle and 840 rpm at full load. ww w w www wwww a) How many poles does this motor have? b) What will be thę slip at nominal load? c) What happens if the nominal load is slipping at half? www. d) What is the electrical frequency of the rotor at half the nominal load? wwww
A 2300 V,3 phase,wye-connected synchronous motor has a synchronous reactance of 3 ohms per phase and an armature resistance of 0.25 ohms per phase. The motor operates on load such that the power angle is -15, and the excitation is so adjusted that the internally induced voltage is equal in magnitude to the internal voltage. Determine the armature current
A 3 phase, 1500 rpm, 2200 V, star connected synchronous motor has an impedance of 0.4+j90 per phase. At some excitation 2900 V is induced in the armature. Find the maximum torque developed by motor before the motor breaks out of synchronism. Also find the load angle this time.
T-a. The direction of rotation of a single-phase split-phase motor can be change by........ a) reversing the connection of the start winding b) reversing the connection of the run winding c) reversing the connection of the start and run winding at the same time d) "a" or "b", not "c" T-b. Single-phase split-phase motors using an electrolytic capacitor in the start winding circuit should not be cycled more than about__________ time per hour. a) 8 b) 12 c) 24 d) none of the above T-c. When replacing the capacitor in a capacitor-start induction-run motor, one must be sure to replace the bad capacitor with__________ . a) a smaller one b) one of the same size c) a larger one d) none of the above
Sketch the V curve for a synchronous motor. Label the axes. Indicate where the power factor is lagging and where it is leading. Draw the phasor diagram corresponding to the minimum point on the V curve.
A three-phase induction motor used for a commercial application in Oman runs at 580 rpm at no load and at 552 rpm at full load. a) How many poles do this motor have? b) What is the percentage slip at full load? c) The frequency of the rotor currents when slip is 5 % d) The frequency of the rotor currents at standstill. a) b) c) d)
A three-phase induction motor is supplied with power from a 60-Hz source. At full load the motor speedis 1728 rpm, and at no load the speed is nearly 1800 rpm. At full-load conditions, determine thefollowing:a) Number of polesb) Slipc) Frequency of the rotor voltages
What are typical applications of synchronous motors?

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