A three-phase induction motor with the specification in Table Q4(a) is used to drive a conveyor belt system. Determine: Table Q4(a): Specification of the induction motor Line voltage Operation frequency Connection type No. of pole Rotor type Per phase impedance (refer to stator circuit) 415 V 50 Hz Y 4 Wound R=0.552 R= 0.252 Χ- 1.20 Ω Χ-0.40Ω XM= 35.0 2 Slip Core losses 3 % 250 W 150 W Friction and windage losses Stray losses 80 W (a) Sketch an equivalent circuit of the induction motor. (b) The stator speed, rotor speed and frequency of rotor. (c) The line current.

Electric Motor Control
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ISBN:9781133702818
Author:Herman
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Chapter39: Synchronous Motor Operation
Section: Chapter Questions
Problem 14SQ: Induction motors and welding transformers require magnetizing current, which causes a. lagging power...
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A three-phase induction motor with the specification in Table Q4(a) is used to drive a conveyor
belt system. Determine:
Table Q4(a): Specification of the induction motor
Line voltage
Operation frequency
Connection type
No. of pole
Rotor type
Per phase impedance (refer to
stator circuit)
415 V
50 Hz
Y
4
Wound
R= 0.552 R= 0.252
Χ- 1.20 Ω Χ -0.40Ω
XM = 35.0 2
Slip
Core losses
Friction and windage losses
Stray losses
3 %
250 W
150 W
80 W
(a)
Sketch an equivalent circuit of the induction motor.
(b)
The stator speed, rotor speed and frequency of rotor.
(c)
The line current.
(d)
The stator copper loss and air-gap power.
(e)
The converted power and output power.
(f)
The efficiency of motor at full load conditions.
The induced and load torque.
Transcribed Image Text:A three-phase induction motor with the specification in Table Q4(a) is used to drive a conveyor belt system. Determine: Table Q4(a): Specification of the induction motor Line voltage Operation frequency Connection type No. of pole Rotor type Per phase impedance (refer to stator circuit) 415 V 50 Hz Y 4 Wound R= 0.552 R= 0.252 Χ- 1.20 Ω Χ -0.40Ω XM = 35.0 2 Slip Core losses Friction and windage losses Stray losses 3 % 250 W 150 W 80 W (a) Sketch an equivalent circuit of the induction motor. (b) The stator speed, rotor speed and frequency of rotor. (c) The line current. (d) The stator copper loss and air-gap power. (e) The converted power and output power. (f) The efficiency of motor at full load conditions. The induced and load torque.
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