A shunt-connected dc motor has zero rotational losses and RA=0. Assume that RF+Radj is constant [except in part (d)] and that ϕ is directly proportional to field current. For VT=200 V and Pout=2 hp, the speed is 1200 rpm. What is the effect on IA and speed if: a. the load torque doubles; b. the load power doubles; c. VT is changed to 100 V and Pout remains constant; d. RF+Radj is doubled in value and Pout remains constant?
A shunt-connected dc motor has zero rotational losses and RA=0. Assume that RF+Radj is constant [except in part (d)] and that ϕ is directly proportional to field current. For VT=200 V and Pout=2 hp, the speed is 1200 rpm. What is the effect on IA and speed if: a. the load torque doubles; b. the load power doubles; c. VT is changed to 100 V and Pout remains constant; d. RF+Radj is doubled in value and Pout remains constant?
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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A shunt-connected dc motor has zero rotational losses and RA=0. Assume that RF+Radj is constant [except in part (d)] and that ϕ is directly proportional to field current. For VT=200 V and Pout=2 hp, the speed is 1200 rpm. What is the effect on IA and speed if: a. the load torque doubles; b. the load power doubles; c. VT is changed to 100 V and Pout remains constant; d. RF+Radj is doubled in value and Pout remains constant?
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