What are the functions of commutator and brushes in a DC motor?

Introductory Circuit Analysis (13th Edition)
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ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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Q.4 (a) What are the functions of commutator and brushes in a 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.
(c) Show that the torque-speed characteristic of a series-connected DC motor is given
by:
KK,V?
(RẠ + Rp + KKpwm)?
Taev
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.
(d) Define synchronous speed and slip.
(e) Explain the principle of operation of a three phase induction motor.
Transcribed Image Text:Q.4 (a) What are the functions of commutator and brushes in a 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. (c) Show that the torque-speed characteristic of a series-connected DC motor is given by: KK,V? (RẠ + Rp + KKpwm)? Taev 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. (d) Define synchronous speed and slip. (e) Explain the principle of operation of a three phase induction motor.
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