Machine M2 is a series motor whose armature and field resistances are 40 Table 2 0CC for and 10 milliohms respectively. the occ is given in table 2. The brush M2 at 750 rpm contact drop may be assumed constant at 1v, and the rotational losses are Amps Volts approximately equal to 3n, where n is the speed in rps 0.0 20 3.5 QI: Ai hp shunt de motor runs on 80 V and draws 14 A line current; the field current is 0A A, and the shaft speed is 1750 rpm. The temperature of he armature winding is estimated to be 80°c. the armature resistance is 0.25Q at 20°c. 4.7 10 6.45 15 8.45 20 10.1 I1 35 30 25 12.35 12.9 a) Find the input power and the conversion power., b) Find the developed torque and the load torque. c) Find the conversion, mechanical, and over- all efficiency a) Find the current at which efficency is maximum, and find the maximum efficency. What assumption is needed for this calculation? 35 40 13.4 50 13.92 60 142 75 143 b) The load on the motor is reduced so that the line current becoms 6 A; the temperature of the armature winding decreases to 60 °c. (i) find the shaft speed; f m) repeat part (a), (b), and (c) for the new load.

Machine M2 is a series motor whose armature and field resistances are 40 Table 2 0CC for and 10 milliohms respectively. the occ is given in table 2. The brush M2 at 750 rpm contact drop may be assumed constant at 1v, and the rotational losses are Amps Volts approximately equal to 3n, where n is the speed in rps 0.0 20 3.5 QI: Ai hp shunt de motor runs on 80 V and draws 14 A line current; the field current is 0A A, and the shaft speed is 1750 rpm. The temperature of he armature winding is estimated to be 80°c. the armature resistance is 0.25Q at 20°c. 4.7 10 6.45 15 8.45 20 10.1 I1 35 30 25 12.35 12.9 a) Find the input power and the conversion power., b) Find the developed torque and the load torque. c) Find the conversion, mechanical, and over- all efficiency a) Find the current at which efficency is maximum, and find the maximum efficency. What assumption is needed for this calculation? 35 40 13.4 50 13.92 60 142 75 143 b) The load on the motor is reduced so that the line current becoms 6 A; the temperature of the armature winding decreases to 60 °c. (i) find the shaft speed; f m) repeat part (a), (b), and (c) for the new load.

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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