Industrial Motor Control
7th Edition
ISBN: 9781133691808
Author: Stephen Herman
Publisher: Cengage Learning
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Textbook Question
Chapter 36, Problem 1RQ
List five common starting methods for three-phase squirrel-cage motors.
Expert Solution & Answer
To determine
The five common starting methods for three phase squirrel cage motors.
Explanation of Solution
Starters are used to limit the starting current for three phase squirrel cage induction motors. The most common starting methods for three phase squirrel cage motors are:
- 1. Across the line starting method
- 2. Resistor starting
- 3. Autotransformer starting
- 4. Y-delta starting
- 5. Part winding starting
Thus, the five common starting methods for three phase squirrel cage motors are listed.
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Students have asked these similar questions
State four advantages of a pre-engaged starter when compared with an inertia type.
Calculate the percentage speed regulation of a motor at full load if the machine runs at 1000 rpm at no-load and the full load speed is 900 rpm.
A 7460 W split-phase motor running at 1750 rpm is used to drive a rotary pump. The pump should run continuously at approximately 1175 rpm. The center distance should not exceed 1118 mm. Space limits the diameter of the driven pulley to 292 mm.
Determine:
a. the pulley diameters,
b. the belt size, and
c. the number of belt required.
Chapter 36 Solutions
Industrial Motor Control
Ch. 36 - List five common starting methods for three-phase...Ch. 36 - Prob. 2RQCh. 36 - A squirrel-cage motor produces 1100 pound-feet of...Ch. 36 - What is the most common device used to disconnect...Ch. 36 - Prob. 5RQCh. 36 - Prob. 6RQCh. 36 - Prob. 7RQCh. 36 - Prob. 8RQCh. 36 - Prob. 9RQCh. 36 - Prob. 10RQ
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- a 7460 w split-phase motor running at 1750 rpm is used to drive a rotary pump. the pump should run continuously at approximately 1175 rpm. the center distance should not exceed 1118 mm. space limits the diameter of the driven pulley to 292 mm. design a. the pulley diameters, b. the belt size, and c. the number of belt required.arrow_forwardIn servo motors, the position is determined by: a. The frequency of the PWM signal. b. The amplitude of the PWM signal. c. The duty cycle of the PWM signal.arrow_forward1: Determine a suitable capacity of a continuous rated motor for the following duty cycle: 100 kW for 5 minute, 20 kW for 10 minutes, then remain 5 minute at no load, the duty cycle is repeated indefinitely. Draw the load cycle.arrow_forward
- A 50 Hz pump drive requires a torque of 70 Nm approx. at 1450 rpm approx. for 1 minute followed by 5 minutes running unloaded. This cyclic pattern is repeated continuously. The motor is to be selected from a range of general-purpose motors with continuous ratings of 2.2, 3, 4, 5.5, 7.5, 11, 15 and 20 kW. The motors have a pull-out torque of 200%. 1. Select the pole number. 2. Calculate the continuous power rating. 3. 4. Calculate the required power rating given the pull out torque rating. Estimate the slip when the motor drives the pump at the required speed. Choose the motor from the range of options that is most fit for purpose. 5. Enter your answers in the units indicated (without unit symbols) corrected if necessary to two decimal places. Answer: Number of poles= ✓ Continuous power rating (kW)= Required power rating for 200% pull out torque (kW)= Percentage slip (%) = Most suitable motor from given range (kW)-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_forwardDefine motorarrow_forward
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