Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Textbook Question
Chapter 29, Problem 1SQ
Indicate the correct terminal markings for a star-delta motor on Figure 29–9.
FIG. 29–9
Expert Solution & Answer
To determine
Specify the correct terminal markings of the star-delta motor in Figure 29-9.
Explanation of Solution
Star-delta motors:
The construction of star-delta motor is similar like standard type of squirrel cage motors. In star-delta motor, two ends of each of the three windings are brought out to terminals.
Refer Figure 29-9 in the textbook for the star-delta motor circuit. Modify the figure by mentioning the all-terminal markings and the modified circuit diagram as shown in Figure 1.
In Figure 1, T1, T2, T3, T4, T5, and T6 are the six leads of motor.
Conclusion:
Thus, the correct terminal markings are mentioned in the star-delta motor.
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Students have asked these similar questions
7- Iron loss in the rotor of a 3-phase induction motor is negligible due to
(a) Very low frequency of emf induced in the rotor
(c) Very low flux density in rotor parts
8- The starting current of a 3-phase induction motor is about
(a) Half
(c) 5 to 7 times
(b) Twice
(d) 8 to 10 times
9- During plugging of an induction motor
(a) Phase sequence is reversed
(b) A de source is connected to stator
(e) One phase is open circaited
(d) Power is ied back to mains
10- Direct online (D.O.L.) starter is used for induction motors
(a)Less than 5 h.p. (b) Less than 10 h.p. (c) Greater than 10 h.p. (d) For any capacity
(b) Very low emf induced in the rotor
(d) Constant magnitude of flux linking the rotor core
of its full load rated current
I need the answer quickly
Question 4
Three phase, 50 Hz, four pole Induction motor runs at 1,293 rpm. Calculate the frequency of rotor emf.
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