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Question 4. (30 Marks) A 480V, Y-connected, 4-pole synchronous motor is drawing 40A at unity power factor from a 480V infini

o How much field current would be required to make the motor openate at 0,8 PE lagging with the same real power?

Question 4. (30 Marks) A 480V, Y-connected, 4-pole synchronous motor is drawing 40A at unity power factor from a 480V "infinite" bus. The field current flowing under these conditions is 4A. Its synchronous reactance is 8Ω (neglect Ra). Assume a linear open-circuit characteristic. a) Find the internal voltage and the torque angle for these conditions. b) Draw the Phasor diagram for this condition. On the same axis, use dashed lines to show the Phasor for 0.8 lagging operation while consuming the same amount of real power
o How much field current would be required to make the motor openate at 0,8 PE lagging with the same real power?
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Answer #1

The solution for star connected synchronous motor are provided under.

Given is nmoete Motur: line voltage sepply 4s0V Phase vo Itage (for star Connector) Yph,430 vol - cuaye at no. tela current

V3 3 32.ISIOss3 38 ox 千23.3002 322E IsTo ts 2 42 3 3202 교

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