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Figure 2 shows a cylindrical iron-clad solenoid actuator which is used for tripping circuit breakers. When the coil current is zero, the plunger drops against a stop such that the gap g is 2.25 cm. When the coil is energized by a direct current of sufficiently large, the plunger is raised until it hits another stop set so that g is 0.2cm. The plunger is supported so that it can move freely in the vertical direction. The radial air gap g1 between the shell and the plunger can be assumed to be uniform and 0.05 cm in length. The exciting coil has 1300 turns and carries a constant current of 2.3 A. Assume that magnetic leakage and fringing in the air gaps and the MMF in the iron are negligible. Obtain the expressions for the flux density, coenery, and force acting on the plunger as a function of air gap length g, and determine the values of force on the

Figure 2 shows a cylindrical iron-clad solenoid actuator which is used for tripping circuit breakers. When the coil current is zero, the plunger drops against a stop such that the gap g is 2.25 cm. When the coil is energized by a direct current of sufficiently large, the plunger is raised until it hits another stop set so that g is 0.2cm. The plunger is supported so that it can move freely in the vertical direction. The radial air gap g1 between the shell and the plunger can be assumed to be uniform and 0.05 cm in length. The exciting coil has 1300 turns and carries a constant current of 2.3 A. Assume that magnetic leakage and fringing in the air gaps and the MMF in the iron are negligible. Obtain the expressions for the flux density, coenery, and force acting on the plunger as a function of air gap length g, and determine the values of force on the

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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Figure 2 shows a cylindrical iron-clad solenoid actuator which is used for tripping circuit breakers. When the coil current is zero, the plunger drops against a stop such that the gap g is 2.25 cm. When the coil is energized by a direct current of sufficiently large, the plunger is raised until it hits another stop set so that g is 0.2cm. The plunger is supported so that it can move freely in the vertical direction. The radial air gap gı between the shell and the plunger can be assumed to be uniform and 0.05 cm in length. The exciting coil has 1300 turns and carries a constant current of 2.3 A. Assume that magnetic leakage and fringing in the air gaps and the MMF in the iron are negligible. Obtain the expressions for the flux density, coenery, and force acting on the plunger as a function of air gap length g., and determine the values of force on the plunger at g = 2.25 cm and g = 0.2 cm. P.S. The permeability of the free space is 4, = 4 • n • 10-7[H/m].
Transcribed Image Text:Figure 2 shows a cylindrical iron-clad solenoid actuator which is used for tripping circuit breakers. When the coil current is zero, the plunger drops against a stop such that the gap g is 2.25 cm. When the coil is energized by a direct current of sufficiently large, the plunger is raised until it hits another stop set so that g is 0.2cm. The plunger is supported so that it can move freely in the vertical direction. The radial air gap gı between the shell and the plunger can be assumed to be uniform and 0.05 cm in length. The exciting coil has 1300 turns and carries a constant current of 2.3 A. Assume that magnetic leakage and fringing in the air gaps and the MMF in the iron are negligible. Obtain the expressions for the flux density, coenery, and force acting on the plunger as a function of air gap length g., and determine the values of force on the plunger at g = 2.25 cm and g = 0.2 cm. P.S. The permeability of the free space is 4, = 4 • n • 10-7[H/m].
-25 cm- -20 cm- Coil 2.5 cm 1,300 turns Cylindrical cast steel 20 cm shell 00 = 1 2.5 cm Cylindrical plunger 10 cm- Figure 2. Solenoid actuator. bo
Transcribed Image Text:-25 cm- -20 cm- Coil 2.5 cm 1,300 turns Cylindrical cast steel 20 cm shell 00 = 1 2.5 cm Cylindrical plunger 10 cm- Figure 2. Solenoid actuator. bo
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