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

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter29: Dc Generators

Section: Chapter Questions

Problem 1PA: You are working as an electrician in a large steel manufacturing plant, and you are in the process...

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