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Example: A 100 hp, 250 V compounded dc 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. Rs Ls ww NF 1000 turn/pole 0.04 Ω Radj NSE=3 turn/pole EA V₁ = 250V • Cumulatively compounded LE • Differentially compounded 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. Tikrit University 31 EMI DC Machines_MotorPart2 Dr Thamir Hassan ATYIA 300 250 233 200 150 100 50 8.0 9.0 Open-circuit terminal voltage, V 0.0 1.0 Figure 8-9 2.0 3.0 6.0 Field current, A 4.0 4.3 5.0 .. 7.0 10.0

Example: A 100 hp, 250 V compounded dc 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. Rs Ls ww NF 1000 turn/pole 0.04 Ω Radj NSE=3 turn/pole EA V₁ = 250V • Cumulatively compounded LE • Differentially compounded 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. Tikrit University 31 EMI DC Machines_MotorPart2 Dr Thamir Hassan ATYIA 300 250 233 200 150 100 50 8.0 9.0 Open-circuit terminal voltage, V 0.0 1.0 Figure 8-9 2.0 3.0 6.0 Field current, A 4.0 4.3 5.0 .. 7.0 10.0

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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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. Ls Rs LA RA ww NF 1000 turn/pole 0.04 02 NSE=3 turn/pole RE V₁ = 250V 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. Tikrit University 31 EMI DC Machines_MotorPart2 Dr Thamir Hassan ATYIA 300 250 233 200 150 100 50 8.0 9.0 Open-circuit terminal voltage. V 0.0 1.0 Figure 8-9 2.0 6.0 Field current, A 3.0 4.0 4.3 5.0 7.0 • Cumulatively compounded • Differentially compounded 10.0
Transcribed Image Text: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. Ls Rs LA RA ww NF 1000 turn/pole 0.04 02 NSE=3 turn/pole RE V₁ = 250V 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. Tikrit University 31 EMI DC Machines_MotorPart2 Dr Thamir Hassan ATYIA 300 250 233 200 150 100 50 8.0 9.0 Open-circuit terminal voltage. V 0.0 1.0 Figure 8-9 2.0 6.0 Field current, A 3.0 4.0 4.3 5.0 7.0 • Cumulatively compounded • Differentially compounded 10.0
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