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A d.c. series motor is driven by a DC variable-speed drive. The motor field and armature resistances both equal 0.2ohm. With a lightload on the motor shaft, the armature runs at 3000rev/min and draws 8A from a 48V supply. a) Determine the motor constant kv. b) The frequency of the drive is set to 250 Hz, and the on-time is 3.5ms. The average armature current is measured as 80A. Calculate the values of armature speed and torque.

A d.c. series motor is driven by a DC variable-speed drive. The motor field and armature resistances both equal 0.2ohm. With a lightload on the motor shaft, the armature runs at 3000rev/min and draws 8A from a 48V supply. a) Determine the motor constant kv. b) The frequency of the drive is set to 250 Hz, and the on-time is 3.5ms. The average armature current is measured as 80A. Calculate the values of armature speed and torque.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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A d.c. series motor is driven by a DC variable-speed drive. The motor field and armature resistances both equal 0.2ohm. With a lightload on the motor shaft, the armature runs at 3000rev/min and draws 8A from a 48V supply. a) Determine the motor constant kv. b) The frequency of the drive is set to 250 Hz, and the on-time is 3.5ms. The average armature current is measured as 80A. Calculate the values of armature speed and torque.
Transcribed Image Text:A d.c. series motor is driven by a DC variable-speed drive. The motor field and armature resistances both equal 0.2ohm. With a lightload on the motor shaft, the armature runs at 3000rev/min and draws 8A from a 48V supply. a) Determine the motor constant kv. b) The frequency of the drive is set to 250 Hz, and the on-time is 3.5ms. The average armature current is measured as 80A. Calculate the values of armature speed and torque.
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