Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Chapter 34, Problem 2RQ
To determine
Identify why high-impedance stator windings are used in induction motors intended to be controlled by variable voltage.
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Name three factors that determine the amount of voltage induced in the rotor of a wound-rotor motor.
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Problem 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:
Chapter 34 Solutions
Understanding Motor Controls
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- Why can an induction motor never operate at synchronous speed?arrow_forwardA (21 HP, 3-Phase, 380 volts) motor with an efficiency of 95% is operating at a load factor of 0.63. What is the input current (Amperes) when the power factor is 89%? (1 HP = 0.75 kW)arrow_forwardplease answer quickly!!arrow_forward
- When 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_forwardWhich of the following is a symbol of an air motor in one direction with invariable capacity isarrow_forwardThe 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_forward
- I need the answer as soon as possiblearrow_forwardQuestion 2 Beli vifth Slack side Motor (imprut) Tight side Beli thickpess\ Centre distance Figure 2 Figure 2 shows an open flat belt drive connected to a motor and a pulley. The motor transmits 20 kw to the connect pulley of 450 mm diameter and is rotating at 850 r/min to a second pulley rotating at 400 r/min. The distance between pulley centres is approximately 2 m. The belt is 6 mm thick and has a density of 970 kg/m. The maximum stress in the belt is not to exceed 2,7 MPa. The coefficient of friction for both pulleys is 0,3. Determine: 2.1. The diameter of the second pulley. 2.2. The length of the belt. 3.3. The width of the belt taking centrifugal tension into account.arrow_forwardFor what purpose are synchronous motors used? Explain the V curves of the synchronous motor.arrow_forward
- There is a 3 HP, 220 Vrms single - phase induction motor that operates with a 0.85 lagging power factor and 80 9% efficiency. What is the magnitude of the RMS motor current? O 75 Amps 15 Amps O 5 Amps O 3 Ampsarrow_forwardQ A motor of 15 horsepower, has a code letter L, and is operated on a 400-volt line. Find the locked rotor currentarrow_forwardA 480V, 3-phase, 50Hz 6-pole Induction motor with a rated power of 10KVA. (i) Calculate the synchronous speed in rad/sec (ws) (ii) Determine the rotor speed in rpm, if the % slip is 2.5%arrow_forward
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