A 75-HP, three-phase, six-pole, 60-Hz, Y-connected, cylindrical-rotor synchronous motor has synchronous reactance of 9.6 Ω per phase. Its rated terminal voltage is 500 v per phase. (a) Find the value of excitation voltage that makes maximum torque to be 120 percent of rated torque. (b) The machine is operated with the excitation voltage set as in part (a). For rated load torque, find the armature current, the power factor, and the torque angle.
A 75-HP, three-phase, six-pole, 60-Hz, Y-connected, cylindrical-rotor synchronous motor has synchronous reactance of 9.6 Ω per phase. Its rated terminal voltage is 500 v per phase. (a) Find the value of excitation voltage that makes maximum torque to be 120 percent of rated torque. (b) The machine is operated with the excitation voltage set as in part (a). For rated load torque, find the armature current, the power factor, and the torque angle.
Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)
10th Edition
ISBN:9781337399128
Author:Russell E. Smith
Publisher:Russell E. Smith
Chapter14: Troubleshooting Electric Control Devices
Section: Chapter Questions
Problem 2RQ
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Question
- A 75-HP, three-phase, six-pole, 60-Hz, Y-connected,
cylindrical-rotor synchronous motor has synchronous
reactance of 9.6 Ω per phase. Its rated terminal voltage is
500 v per phase. (a) Find the value of excitation voltage that
makes maximum torque to be 120 percent of rated torque.
(b) The machine is operated with the excitation voltage set
as in part (a). For rated load torque, find the armature
current, the power factor, and the torque angle.
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Current direction choice
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