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A 400V, star connected, three-phase, 6-pole 50 Hz IM has the following parameters referred to the stator; Rs Rr 1 2, Xs = Xr 2 2. For regenerative braking operation of this motor determine: a) Max. overhauling torque it can hold and range of speed for save operation b) Speed at which it will hold an overhauling load with torque of 100N-m %3D %3D %3D

A 400V, star connected, three-phase, 6-pole 50 Hz IM has the following parameters referred to the stator; Rs Rr 1 2, Xs = Xr 2 2. For regenerative braking operation of this motor determine: a) Max. overhauling torque it can hold and range of speed for save operation b) Speed at which it will hold an overhauling load with torque of 100N-m %3D %3D %3D

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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A 400V, star connected, three-phase, 6-pole 50 Hz IM has the following parameters referred to the stator; Rs Rr 1 2, Xs = Xr 2 2. For regenerative braking operation of this motor determine: a) Max. overhauling torque it can hold and range of speed for save operation b) Speed at which it will hold an overhauling load with torque of 100N-m %3D %3D The same motor from the previous example is use to braked by plugging from its initial full load speed of 950 rpm. Stator to motor turn ratio is 2.3. Calculate; a) The initial braking current and torque as a ration of full load values b) The value of the resistance to inserted in rotor to reduce the max. braking current to 1.5 time full load current. Thus, determine the initial braking torque. 26
Transcribed Image Text:A 400V, star connected, three-phase, 6-pole 50 Hz IM has the following parameters referred to the stator; Rs Rr 1 2, Xs = Xr 2 2. For regenerative braking operation of this motor determine: a) Max. overhauling torque it can hold and range of speed for save operation b) Speed at which it will hold an overhauling load with torque of 100N-m %3D %3D The same motor from the previous example is use to braked by plugging from its initial full load speed of 950 rpm. Stator to motor turn ratio is 2.3. Calculate; a) The initial braking current and torque as a ration of full load values b) The value of the resistance to inserted in rotor to reduce the max. braking current to 1.5 time full load current. Thus, determine the initial braking torque. 26
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