Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Chapter 23, Problem 7RQ
To determine
Identify the two factors that determine the synchronous speed.
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Chapter 23 Solutions
Understanding Motor Controls
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- What type of commutator is used with a brush-lifting repulsion-start induction-run motor?arrow_forwardWhy can an induction motor never operate at synchronous speed?arrow_forwardWhen a repulsion-start induction-run motor reaches about 75% of rated full-load speed, it stops operating as a repulsion motor and starts operating as a squirrel-cage motor. What must be done to cause the motor to begin operating as a squirrel-cage motor?arrow_forward
- The reason why the starting torque of a series motor is higher than a shunt motor is because the series motor has O more current flowing through its armature O a stronger net magnetic field around both coils during the inrush of stator currentarrow_forwardIs the synchronous motor an induction motor?arrow_forwardName three factors that determine the torque produced by an induction motor.arrow_forward
- 7. Who among the following got a patent for an induction motor in 1888? A. Newton B. Torilcelli C. Nichola Tesla D. Thomas Edisonarrow_forward26. Explain the principles of DC motors, including the DC permanent magnet motor and how it can have speed control. (10 marks)arrow_forwardProblem 5 1. Where and why is a centrifugal switch used in a split-phase motor? 2. Why and where is a capacitor used in the single-phase AC motor? 3. What type of motor would you select to perform each of the following jobs? (a) Electric drill: (b) Refrigerator: (c) Hair driers and desk fans: (d) Air Conditioner Fan: (e) XY plotters and printers: (f) Electric clock:arrow_forward
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