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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A three phase induction motor
operates with a rotor speed of 1440
rpm and develops a torque of
66.32NM at full load. The full load
power output is *
O 10 kw
O 9 kw
O 8 kW
O 11 kW
Name three factors that determine the amount of voltage induced in the rotor of a wound-rotor motor.
Name three factors that determine the torque produced by an induction motor.
Chapter 34 Solutions
Understanding Motor Controls
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- 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_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_forward
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