(a)
The current drawn by the motor when it is first started up.
(a)
Answer to Problem 34P
The current drawn by the motor when it is first started up is
Explanation of Solution
Write an expression for the current drawn by the motor when it is first started up.
Here,
Conclusion:
Substitute
Thus, the current drawn by the motor when it is first started up is
(b)
The current draws at normal operating speed.
(b)
Answer to Problem 34P
The current draws at normal operating speed is
Explanation of Solution
Write an expression for Kirchhoff’s voltage law.
Here,
Write an expression for back emf.
Here,
Rewrite the expression (II) by using equation (III).
Rearrange (IV) to calculate
Conclusion:
Substitute
Thus, the current draws at normal operating speed is
(c)
The back emf induced in the winding at normal speed.
(c)
Answer to Problem 34P
The back emf induced in the winding at normal speed is
Explanation of Solution
Write an expression for back emf induced in the winding at normal speed.
Here,
Conclusion:
Substitute
Thus, the back emf induced in the winding at normal speed
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