A step-down chopper is to be used to supply power from a 600-V overhead wire to the commutator motor on a trolley bus. The motor may be mod- eled as a generated direct voltage in series with a resistance of 0.2 and an inductance of 25 mH. The frequency of the chopper is set at 500 Hz. (a) When the bus is stopped, what should be the ON time of the chopper to provide a motor current of 150 A? (b) What is the maximum possible generated voltage of the motor for which a current of 150 A can be supplied? (c) What is the average value of the supply current for the conditions of (a) and (b)? (d) If the motor current is to be continuous, what should be its minimum value?

A step-down chopper is to be used to supply power from a 600-V overhead wire to the commutator motor on a trolley bus. The motor may be mod- eled as a generated direct voltage in series with a resistance of 0.2 and an inductance of 25 mH. The frequency of the chopper is set at 500 Hz. (a) When the bus is stopped, what should be the ON time of the chopper to provide a motor current of 150 A? (b) What is the maximum possible generated voltage of the motor for which a current of 150 A can be supplied? (c) What is the average value of the supply current for the conditions of (a) and (b)? (d) If the motor current is to be continuous, what should be its minimum value?

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Concept explainers

Single Phase Induction Motor

The single-phase induction motor or engine consists of a single rotating phase in the stator and a rotating cage in the rotor. When phase one supply is connected to the stator winding, a magnetic field is generated. In the pulsating field, the rotor does not rotate due to inertia. So, a single-phase import motor does not start and requires some initial methods.

Question

A step-down chopper is to be used to supply power from a 600-V overhead
wire to the commutator motor on a trolley bus. The motor may be mod-
eled as a generated direct voltage in series with a resistance of 0.2 and
an inductance of 25 mH. The frequency of the chopper is set at 500 Hz.
(a) When the bus is stopped, what should be the ON time of the chopper
to provide a motor current of 150 A?
(b) What is the maximum possible generated voltage of the motor for
which a current of 150 A can be supplied?
(c) What is the average value of the supply current for the conditions of
(a) and (b)?
បទៅនឹងរស់របស
(d) If the motor current is to be continuous, what should be its minimum.
value?

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Step 2: (a) ON time of the chopper to provide a motor current of 150 A

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Step 3: (b) Maximum possible generated voltage of the motor for which a current of 150 A can be supplied

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Step 4: (c) Average value of the supply current for the conditions of (a) and (b)

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Step 5: (d) Minimum value of motor current for continuous operation

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