(b) List three methods that can be used to control the speed of DC motors. Explain why one of the methods may not be suitable for series-connected DC motor.
(b) List three methods that can be used to control the speed of DC motors. Explain why one of the methods may not be suitable for series-connected DC motor.
Introductory Circuit Analysis (13th Edition)
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ISBN:9780133923605
Author:Robert L. Boylestad
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Chapter1: Introduction
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![(b) List three methods that can be used to control the speed of DC motors. Explain
why one of the methods may not be suitable for series-connected DC motor.
(c) Show that the torque-speed characteristic of a series-connected DC motor is given
by:
KK,V;
(Ra + Rp + KK-wm)?
Taev
%3D
where Tdev is the torque developed in the machine, RA is the resistance in armature
circuit, RF is the resistance in the field circuit, K is the machine constant that
depends on the design parameters of the machine, om is the angular velocity of the
rotor, KF is a constant that depends on the number of field windings, the geometry
of the magnetic circuit, and the B-H characteristics of the iron and VT is the
voltage applied to the armature.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fcb8da163-01e4-4840-b7c5-cc8b8d576a75%2F0811f2d2-8edc-4744-b2b6-d9f8afc74b5d%2Fp09hst_processed.png&w=3840&q=75)
Transcribed Image Text:(b) List three methods that can be used to control the speed of DC motors. Explain
why one of the methods may not be suitable for series-connected DC motor.
(c) Show that the torque-speed characteristic of a series-connected DC motor is given
by:
KK,V;
(Ra + Rp + KK-wm)?
Taev
%3D
where Tdev is the torque developed in the machine, RA is the resistance in armature
circuit, RF is the resistance in the field circuit, K is the machine constant that
depends on the design parameters of the machine, om is the angular velocity of the
rotor, KF is a constant that depends on the number of field windings, the geometry
of the magnetic circuit, and the B-H characteristics of the iron and VT is the
voltage applied to the armature.
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