Example: A 100 hp, 250 V compounded de motor with compensating windings has an internal resistance, including the series winding, of 0.04 2. There are 1000 turns per pole on the shunt filed and 3 turns per pole on the series winding. The machine is shown in Figure 8-27, and its magnetization curve is shown in Figure 8-9. At no load, the field resistor has been adjusted to make the motor run at 1200 r/min. The core, mechanical, and stray losses may be neglected. R$ Ls IL www ww NF 1000 turn/pole NSE=3 turn/pole V₁= 250V EA LF a) What is the shunt filed current in this machine at no load? b) If the motor is cumulatively compounded, find its speed when IA = 200 A. c) If the motor is differentially compounded, find its speed when IA = 200 A. 0.04 92 C Radj RF

Example: A 100 hp, 250 V compounded de motor with compensating windings has an internal resistance, including the series winding, of 0.04 2. There are 1000 turns per pole on the shunt filed and 3 turns per pole on the series winding. The machine is shown in Figure 8-27, and its magnetization curve is shown in Figure 8-9. At no load, the field resistor has been adjusted to make the motor run at 1200 r/min. The core, mechanical, and stray losses may be neglected. R$ Ls IL www ww NF 1000 turn/pole NSE=3 turn/pole V₁= 250V EA LF a) What is the shunt filed current in this machine at no load? b) If the motor is cumulatively compounded, find its speed when IA = 200 A. c) If the motor is differentially compounded, find its speed when IA = 200 A. 0.04 92 C Radj RF

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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4.
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A) Although the magnetic field for each phase of a 3-phase induction motor is merely switching back and forth between north and south poles, the resultant magnetic influence from all phases sets up a rotating magnetic field to cut the rotor conductors. a) true b) false B) In a two-pole stator winding of a 3-phase motor, how many revolutions does the rotating tr) magnetic field make in one cycle of the electrical current? a) one b) 60 c) 3600 d) none of the above
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