A 85 kW, 390 V, 60 Hz, 10 poles, 706 rpm, Y-connected squirrel cage induction motor has following parameters referred to the stator: Rs = 0.07 N, R, = 0.03 N, X, = X, = 0.2 N. Motor speed is controlled by stator voltage control. When driving an overhead crane load the torque equation of the overhead crane is given by TL = 955 N.m. 1- At speed 572 rpm, Calculate: • The motor terminal voltage V (phase voltage). • The torque. N.m • The stator current. I = AZ 2- At voltage V =116 V, Calculate: (Note: V, is phase voltage) • The motor speed. N = rpm • The torque. T= N.m • The stator current. AZ

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A 85 kW, 390 V, 60 Hz, 10 poles, 706 rpm, Y-connected squirrel cage induction motor has following parameters referred to
the stator: R, = 0.07 N, R,
driving an overhead crane load the torque equation of the overhead crane is given by TL
= 0.03 N, X, = X, = 0.2 N. Motor speed is controlled by stator voltage control. When
955 N.m.
1- At speed 572 rpm, Calculate:
The motor terminal voltage Vi (phase voltage).
• The torque.
T =
N.m
The stator current.
AZ
2- At voltage V =116 V, Calculate: (Note: V, is phase voltage)
The motor speed.
N =
rpm
The torque.
T =
N.m
The stator current.
I =
A Z
Transcribed Image Text:A 85 kW, 390 V, 60 Hz, 10 poles, 706 rpm, Y-connected squirrel cage induction motor has following parameters referred to the stator: R, = 0.07 N, R, driving an overhead crane load the torque equation of the overhead crane is given by TL = 0.03 N, X, = X, = 0.2 N. Motor speed is controlled by stator voltage control. When 955 N.m. 1- At speed 572 rpm, Calculate: The motor terminal voltage Vi (phase voltage). • The torque. T = N.m The stator current. AZ 2- At voltage V =116 V, Calculate: (Note: V, is phase voltage) The motor speed. N = rpm The torque. T = N.m The stator current. I = A Z
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