Experiment_17_The_Wound-Rotor_Induction_Motor – Part II

Experiment_17_The_Wound-Rotor_Induction_Motor – Part II

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17 1 Experiment 17 The Wound-Rotor Induction Motor – Part II OBJECTIVE To determine the starting characteristics of the wound-rotor induction motor. To observe the rotor and stator currents at different motor speeds. DISCUSSION In the previous experiment, we saw that a considerable voltage appears across the rotor windings on open circuit, and that this voltage varies linearly with rotor slip in r/min, becoming zero at synchronous speed. If the rotor windings are short-circuited, the induced voltage will cause large circulating currents in the windings. To supply this rotor current, the stator current must increase in value above its ordinary exciting current level. The power consumed (VA) in the rotor windings (and associated circuitry) must be supplied by the stator windings. Therefore, we should expect the following: a) At standstill, or at low speed, the rotor currents, stator currents and toque will be high. b) At synchronous speed, the rotor current and torque will be zero, and the stator will only carry the exciting current. c)
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This note was uploaded on 02/11/2012 for the course EEE 360 taught by Professor Gorur during the Spring '08 term at ASU.

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Experiment_17_The_Wound-Rotor_Induction_Motor – Part II

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