Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 53, Problem 2SQ
To determine
Explain about the principle difference in the classification of gear motors.
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Electric Motor Control
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- In Synchronous Motor Operation How the regulating characteristics can be obtained from V curve?arrow_forward4. A synchronous motor starts but fails to develop its full torque. What could it be due to? 5. What is the relationship between speed and torque regulation in dc shunt motors?arrow_forwardExplain different methods of speed control of induction motor drive.arrow_forward
- 1-D.C. shunt motor maintains a more constant speed under varying load. (True or False) 2-Dc shunt motor is best suited where low starting torque is required. (True or False) 3-The speed of d.c series motor is increased if the armature current is increased. (True or False)arrow_forwardb) Draw the speed control block diagram of the DC motor, which can be controlled with armature voltage and field flux with 3 phase AC-DC driver, and explain how the speed control is done.arrow_forwardQ/ When a series dc motor is operated without a load, which of the following conditions occurs? * Ans 1- The armature draws excessive current 2- The armature speeds out of control 3- The armature will not turn 4-The voltage requirement increasesarrow_forward
- How the field control used in series motorarrow_forwardA DC shunt motor has full load rating of 30 Hp, 230 Volts, 57.1 Amperes, 1,400 rpm. The armature circuit resistance is 0.15 Ohm and the field circuit resistance is 120 Ohms. Neglecting the effect of armature reaction, determine the no-load speed.arrow_forward(TRUE OR FALSE) - Shunt motor should not be started on no-load. - Field copper loss is likely to have highest proportion at rated load ofthe DC generator. - In a DC generator, the iron losses mainly take place in the commutator. - Energy conversion of DC generator is based on the principle ofproduction of dynamically terminal voltage. - Increasing the speed of DC motor, the back emf will decrease but theline current falls. - The current drawn by the armature of DC motor is directly proportionalto torque. - Lenz’s law rule is used to determine the direction of rotation of dcmachines. - Compound dc motor at no-load it regulates highest speed. - The direction of this force is perpendicular to both the wire and themagnetic field in DC motor. - The direction of DC motor induced emf is such that the same of thearmature current.arrow_forward
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