(b) A 2 pole 220 v, 100A, and 850 rpm separately excited DC motor has an armature resistance of 0.15 0. Two field coils are connected in parallel and used to drive a load with the torque of T = 400 – 0.2N, Nm Where N is the motor speed in rpm. Armature voltage control and two field windings connected in series are used in speed control below and above the rated, respectively. (i) Calculate the motor armature current and speed when the armature voltage is reduced to 110V. (ii) Examine the motor speed and current when field coils are connected in series.

(b) A 2 pole 220 v, 100A, and 850 rpm separately excited DC motor has an armature resistance of 0.15 0. Two field coils are connected in parallel and used to drive a load with the torque of T = 400 – 0.2N, Nm Where N is the motor speed in rpm. Armature voltage control and two field windings connected in series are used in speed control below and above the rated, respectively. (i) Calculate the motor armature current and speed when the armature voltage is reduced to 110V. (ii) Examine the motor speed and current when field coils are connected in series.

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

Winding and Constructions

Alternating Current (AC) winding is generally of the 3-phase type due to the inherent advantages of the 3-phase machine. Armature coils must be connected to the yield balance (equivalent in magnitude and 2/3 of the series phase difference of the rod) 3-phase electromotive forces (emf). The armature should be divided into step-bands to start with slots around the perimeter.In the construction of AC machines, the frame is used as an external protective shield to protect it from environmental conditions. The frame also serves as the outer perimeter, allowing the interior to be easily placed. The static state section of the devices is the stator winding attached stator.

Question

(b) A 2 pole 220 V, 100A, and 850 rpm separately excited DC motor has an armature
resistance of 0.15 0. Two field coils are connected in parallel and used to drive a
load with the torque of
TL = 400 – 0.2N, Nm
Where N is the motor speed in rpm.
Armature voltage control and two field windings connected in series are used in
speed control below and above the rated, respectively.
(i)
Calculate the motor armature current and speed when the armature voltage
is reduced to 110VV.
(ii) Examine the motor speed and current when field coils are connected in
series.

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