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

Electric Motor Control

10th Edition

ISBN:9781133702818

Author:Herman

Publisher:Herman

Chapter32: Two-speed, One-winding (consequent Pole) Motor Controllers

Section: Chapter Questions

Problem 6SQ: Describe the operation of Figure 325 (B) by adding jumper wire A to the original circuit.

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