Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Question
Chapter 31, Problem 10RQ
To determine
The percentage rotor slip and the frequency of the induced rotor voltage.
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The supply frequency is 50 Hz. What will be
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An industrial fan running at 600 rpm is driven by a 25 kW, 960 rpm, induction motor. The pulley mounted on the motor shaft is 270 mm. Center to center distance is 1.45 m and use f = 0.35. Determine the length of leather belt
Chapter 31 Solutions
Understanding Motor Controls
Ch. 31 - Prob. 1RQCh. 31 - Prob. 2RQCh. 31 - A wound rotor induction motor has a stator that...Ch. 31 - Name three factors that determine the amount of...Ch. 31 - Prob. 5RQCh. 31 - Explain why controlling the rotor current also...Ch. 31 - What is the function of a micro limit switch when...Ch. 31 - Prob. 8RQCh. 31 - What is rotor slip?
Ch. 31 - Prob. 10RQ
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- Is the rotor excitation current AC or DC?arrow_forwardWith the aid of a diagram indicate the difference between static and dynamic imbalance of a rigid rotor assembly.arrow_forwardAn industrial fan running at 600 rpm is driven by a 25-kW, 960 rpm, induction motor. The pulley mounted on the motor shaft is 270 mm. Center to center distance is 1.5 meters and use f = 0.35. Determine the minimum angle of wrap in rad.arrow_forward
- Briefly explain the effect of the torque taken by the device that loads the motor on the variation of the torsional work and the smoothness of the motor.arrow_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_forwardIn a given DC motor, the output power is 20 HP, and the copper losses are 1.1 KW. If the motor is operating at 87 % efficiency, find the converted power and the rotational losses. Select one: a. Pconv = 16.05 KW and Prot = 1.13 KW b. Pconv = 17.15 KW and Prot = 3.11 KW c. Pconv = 14.92 KW and Prot = 1.35 KW d. Nonearrow_forward
- The factor of safety against slipping in the friction clutch = 1.3; coefficient of friction=0.3; working speed= 600 rpm; friction surface number= 2; If required clamping force = 2917 N, clutch outer diameter = 400 mm, clutch inner diameter = 160 mm, what is the transmitted power?arrow_forwardCan someone please help me to solve the following question showing all work. Thank youarrow_forwardPlease show all stepsarrow_forward
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