32 The following information is given on the brushes used in the motor of Problem 31: number of brushes: 2 current per brush: 15 A brush dimensions: 5/8 in wide, 5/16 in thick, 3/4 in long. (The 5/16 in × 5/8 in area is in contact with the commutator.) resistivity of brush: 0.0016 N| | brush pressure: 1.5 Ibf brush contact drop: 1.2 V coefficient of friction: 0.2 Calculate the following: a. The resistance of the brush body in ohms b. The voltage drop in the brush body c. The total voltage drop in one brush, including the contact voltage drop d. The total electrical power loss (in watts) due to the two brushes e. The frictional force of one brush rubbing against the commutator surface (in Ibf and in newtons) f. The frictional energy expended by the two brushes when the commutator makes one revolution (in joules) g. The power loss due to friction, given the speed of 3000 r/min h. The total brush loss as a percent of the 1.5 hp motor rating

32 The following information is given on the brushes used in the motor of Problem 31: number of brushes: 2 current per brush: 15 A brush dimensions: 5/8 in wide, 5/16 in thick, 3/4 in long. (The 5/16 in × 5/8 in area is in contact with the commutator.) resistivity of brush: 0.0016 N| | brush pressure: 1.5 Ibf brush contact drop: 1.2 V coefficient of friction: 0.2 Calculate the following: a. The resistance of the brush body in ohms b. The voltage drop in the brush body c. The total voltage drop in one brush, including the contact voltage drop d. The total electrical power loss (in watts) due to the two brushes e. The frictional force of one brush rubbing against the commutator surface (in Ibf and in newtons) f. The frictional energy expended by the two brushes when the commutator makes one revolution (in joules) g. The power loss due to friction, given the speed of 3000 r/min h. The total brush loss as a percent of the 1.5 hp motor rating

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter23: Faraday’s Law And Inductance

Section23.2: Motional Emf

Problem 23.4QQ

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