EBK ELECTRIC MACHINERY
EBK ELECTRIC MACHINERY
5th Edition
ISBN: 9780100253919
Author: Chapman
Publisher: YUZU
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Question
Chapter 1, Problem 1.17P

(a)

To determine

The reasonable maximum flux density for the given core.

(b)

To determine

The total flux in the core for the given flux density.

(c)

To determine

The reasonable number of turns which provide the required flux density for the given case.

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DC MACHINE TORQUE The armature of a dc motor has 648 conductors, 65 % of which are directly under thepole where the flux density is 48,000 lines per in2. If the core diameter is 7 inchesand its length is 4 inches and the current in each conductor is 20 A. What is thetorque exerted in the armature in N-m?
Suppose that we are designing a 1200-rpm dc motor to run from a 240-V source. We have determined that the flux density will be 1 T because smaller fluxes make inefficient use of the iron and larger fluxes result in saturation. The radius of the rotor (and thus, the torque arm for the armature conductors) is 0.1 m. The lengths of the armature conductors are 0.3 m. Approximately how many armature conductors must be placed in series in this machine?
The current in a conductor on the armature of a dc motor is 300A. The flux under the poles is 850x10-6 Wb. The area per pole is 700 mm2. The length of the conductor on the armature is 640mm. Calculate the force exerted on the conductor.

Chapter 1 Solutions

EBK ELECTRIC MACHINERY

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