A shunt DC motor is fed from a 235 V DC source. The field coil has a resistance of 116 12. The total armature resistance (including the contact resistance of the brushes against the segments of the commutator) is 0.13 2. The field adjustable resistor is set at 212 12. The motor is rated for 6 hp. The total rotational losses have been measured at full load as 900 W. The motor has compensation windings that can be deactivated (academic). When the compensation windings are deactivated, the armature reaction is 850 A when the armature current is 120 A. The field coil has Nf=2150 turns per pole. Compute both with and without compensation winding, the full load speed in rpm. Magnetization characteristic Eg = f(f): Internal generated voltage E. V 300 280 260 240 230 200 180 160 140 100 NO 60 20 Speed-1200 in Field Current (A) 0 0.4 0.5 0.6 0.7 0.8 0 61 62 63 04 05 06 07 08 09 10 11 12 13 Shastfeldent, A (h) With compensation winding, what is the full load speed, in rpm? (x) Wihout compensation winding, what is the full load speed, in rpm? 0.9 1 1.1 1.2 1.3 1.4 RPM Ea (V) at 1200rpm 3.0305 170.2049 204.4685 230.4445 RPM 249.8647 263.966 273.8616 280.5412 285.1179 288.0247 290.2513 291.983

A shunt DC motor is fed from a 235 V DC source. The field coil has a resistance of 116 12. The total armature resistance (including the contact resistance of the brushes against the segments of the commutator) is 0.13 2. The field adjustable resistor is set at 212 12. The motor is rated for 6 hp. The total rotational losses have been measured at full load as 900 W. The motor has compensation windings that can be deactivated (academic). When the compensation windings are deactivated, the armature reaction is 850 A when the armature current is 120 A. The field coil has Nf=2150 turns per pole. Compute both with and without compensation winding, the full load speed in rpm. Magnetization characteristic Eg = f(f): Internal generated voltage E. V 300 280 260 240 230 200 180 160 140 100 NO 60 20 Speed-1200 in Field Current (A) 0 0.4 0.5 0.6 0.7 0.8 0 61 62 63 04 05 06 07 08 09 10 11 12 13 Shastfeldent, A (h) With compensation winding, what is the full load speed, in rpm? (x) Wihout compensation winding, what is the full load speed, in rpm? 0.9 1 1.1 1.2 1.3 1.4 RPM Ea (V) at 1200rpm 3.0305 170.2049 204.4685 230.4445 RPM 249.8647 263.966 273.8616 280.5412 285.1179 288.0247 290.2513 291.983

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter33: Single-phase Motors

Section: Chapter Questions

Problem 32RQ

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