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engineering
electrical engineering
october 2019
04

Electrical Engineering Questions and Answers October 04, 2019

Expert-verified solutions to help you succeed

The voltage equation of a dc motor is written as where e a (t) is the applied voltage; i a (t), the armature current; R a , the armature resistance; L a , the armature inductance; K b , the back-emf constant; m (t), the motor velocity; and (t), the reference input voltage. Taking the Laplace to transform on both sides of the voltage equation,

dia (t) dt ea(t) Raia(t) La Kiwm(t)

A cross-section of the magnetic structure of a dc machine is shown in Fig.3. There are four identical poles carrying identical coils with the same number of turns and current. The stator poles and rotor are made of sheet steel with a relative permeability of 3800. The stator is made of cast steel with a relative permeability of 1500. The following

Roter Fig. 3 Air gep 42 N 62 Stator Field col

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