Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Textbook Question
Chapter 31, Problem 2SQ
What is meant by the description “separate winding two-speed motor”?
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(B)/ Explain briefly the following
Why the armature is connected as LAP winding with high torque low speed
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What are the reasons for providing compensating windings in a d.c. generator?
(Draw the electrical equivalent circuits for long shunt compounded DC motor and short shunt compounded DC motor carefully and as readable with the names of circuit elements written
on the figures by writing the names of figures below them.)
1- b)Does a DC motor's full-load speed have to be the same as its no-load speed in order for it to be classified as a "constant speed" motor? a) yes b) no c). The voltage produced by the generator action of a rotating DC motor is called a) counter-electromotive force (CEMF) b) back-EMT' c) either "a" or "b" d) neither "a" nor "b" d). Which of the following is/are a factor that will determine the amount of back-EMF generated by the generator action of a DC motor? a) number of armature conductors b) number of lines of flux (flux density) c) the speed at which the conductors are cutting the lines of flux (rate of incidence) d) all of the above
Chapter 31 Solutions
Electric Motor Control
Ch. 31 - Excluding slip, at what speed (r/min) will an...Ch. 31 - What is meant by the description separate winding...Ch. 31 - Prob. 3SQCh. 31 - Prob. 4SQCh. 31 - In Figure 314, what does the broken line between...Ch. 31 - When the high button is depressed in Figure 314,...Ch. 31 - Which coils are energized immediately when the...Ch. 31 - At what speed can a four-pole, 240-volt, 5-hp,...Ch. 31 - What is meant by the compelling action produced by...Ch. 31 - Prob. 10SQ
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- a 220 V DC shunt motor takes 3 A at no-load. It draws 25 a when running at full load at 1500 rpm. The armature and shunt resistances are 0.5 ohm and 220 ohm, respectively. the no-load speed in rpm is _______.arrow_forward٤arrow_forward(Draw the electrical equivalent circuits for long shunt compounded DC motor and short shunt compounded DC motor carefully and as readable with the names of circuit elements writtenon the figures by writing the names of figures below them.)arrow_forward
- Explain the different methods of breaking DC Motorsarrow_forwardQ3 // Answer for the following question: 1-The rotor of a 4 pole, 50 Hz, slip ring induction motor has a resistance of 0.25 ohm per phase and runs at 1440 rpm at full-load.Calculate the external resistance per phase, which must be added to lower the speed to 1200 rpm, torque remaining the same? 2- Calculate the torque developed per phase for a 6-pole, 60 Hz, 3-phase induction motor at a slip of 5%, if the motor develops a maximum torque per phase is 250 N.m while running at 870 r.p.m. ( This question is about electrical machines, and I need to answer in 30 minutes please )arrow_forwardQ3//Answer for the following question: 1-The rotor of a 4 pole, 50 Hz, slip ring induction motor has a resistance of 0.25 ohm per phase and runs at 1440 rpm at full-load. Calculate the external resistance per phase, which must be added to lower the speed to 1200 rpm, torque remaining the same? 2- Calculate the torque developed per phase for a 6-pole, 60 Hz, 3-phase induction motor at a slip of 5%, if the motor develops a maximum torque per phase is 250 N.m while running at 870 r.p.m.arrow_forward
- What do we have to write for Question 7?arrow_forwardC-a). The speed of a single-phase shaded-pole motor is determined by the _________________ . a) frequency of the supply b) number of poles on the stator c) both "a" and "b" d)_ neither "a" nor "b" C-b).. The single-phase shaded-pole motor has low______ torque. a) starting b) running c) both "a" and "b" d) neither "a" nor "b" C-c). The single-phase shaded-pole motor is considered nonreversible. a) true b) falsearrow_forwarddo it on priorityarrow_forward
- 7-6. A three-phase, 60-Hz, four-pole induction motor runs at a no-load speed of 1790 r/min and a full-load speed of 1720 r/min. Calculate the slip and the electrical fre- quency of the rotor at no-load and full-load conditions. What is the speed regulation of this motor [Equation (4-68)]?arrow_forward1- What is the starting torque developed by a split-phase or a capacitor start motor? 2- What is the current in-rush at the time of starting the motor? Does it cause severe fluctuations on the line?arrow_forward5-Which of the following statements regarding single phase induction motors correct? (a) It requires only one winding. (c) It is self-starting. (b) It can rotate in one direction only. (d) It is not self-starting.arrow_forward
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