Understanding Motor Controls
3rd Edition
ISBN: 9781305498129
Author: Stephen L. Herman
Publisher: Cengage Learning
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Textbook Question
Chapter 1, Problem 1RQ
When installing a motor control system, list four major factors to consider concerning the power system.
Expert Solution & Answer
To determine
The four major factors to be considered when installing a motor control in concern with the power system.
Explanation of Solution
The electrical connections that are associated with a motor, machine, and control unit are easy or complex. However, the below-listed factors should be considered while installing a motor and its control.
- Power source –– Check whether the motor and control unit require a single-phase or three-phase power supply with rated voltage and current.
- Motor connections –– A motor connection should be made based on the information found on the name plate of a motor. The name plate of a motor contains information such as horsepower, service factor, voltage, and full load current rating.
- Controller type –– In general, a motor requires simple controller that starts and stops the motor. In addition, a motor may require controllers that vary the speed of the motor at specified time, inching, and jogging.
- Environment –– The environment should not affect a control unit. The elevated temperature and moisture may affect a control unit.
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Q4/ A compressor is driven motor by mean of a flat belt of thickness 10 mm and a width of
250 mm. The motor pulley is 300 mm diameter and run at 900 rpm and the compressor
pulley is 1500 mm diameter. The shaft center distance is 1.5 m. The angle of contact of
the smaller pulley is 220° and on the larger pulley is 270°. The coefficient of friction
between the belt and the small pulley is 0.3, and between the belt and the large pulley is
0.25. The maximum allowable belt stress is 2 MPa and the belt density is 970 kg/m³.
(a) What is the power capacity of the drive and (b) If the small pulley replaced by
V-grooved pulley of diameter 300 mm, grooved angle of 34° and the coefficient of
friction between belt and grooved pulley is 0.35. What will be the power capacity in this
case, assuming that the diameter of the large pulley remain the same of 1500 mm.
You are tasked with designing a power drive system to transmit power between a motor and a conveyor belt in a manufacturing facility as illustrated in figure.
The design must ensure efficient power transmission, reliability, and safety. Given the following specifications and constraints, design drive system for this application:
Specifications:
Motor Power: The electric motor provides 10 kW of power at 1,500 RPM.
Output Speed: The output shaft should rotate at 150 rpm.
Design Decisions:
Transmission ratio: Determine the necessary drive ratio for the system.
Shaft Diameter: Design the shafts for both the motor and the conveyor end.
Material Selection: Choose appropriate materials for the gears, shafts.
Bearings: Select suitable rolling element bearings.
Constraints:
Space Limitation:
The available space for the gear drive system is limited to a 1-meter-long section.
Attribute 4 of CEP
Depth of knowledge required
Fundamentals-based, first principles analytical approach…
Chapter 1 Solutions
Understanding Motor Controls
Ch. 1 - When installing a motor control system, list four...Ch. 1 - Prob. 2RQCh. 1 - Is the National Electrical Code a law?Ch. 1 - Explain the difference between manual control,...Ch. 1 - Prob. 5RQCh. 1 - Explain the difference between jogging and...Ch. 1 - Prob. 7RQCh. 1 - What agency requires employers to provide a...Ch. 1 - What is meant by the term ramping?
Ch. 1 - What is the most important function of any control...
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