A three-phase 60-Hz four-pole induction motor runs at a no-load speed of 1790 r/min and a full-load speed of 1705 r/min. Calculate the slip and the electrical frequency of the rotor at no-load and full-load conditions. Calculate the same when the rotor speed is 1900 rpm.
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The synchronous speed (Ns) of a motor can be calculated using the formula: Ns = (120 * f) / P where f is the frequency of the power supply (60 Hz) and P is the number of poles (4). Ns = (120 * 60) / 4 Ns = 1800 rpm Show more…
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Madhur L.
A three-phase, 60-Hz, four-pole induction motor runs at a no-load speed of 1790 rpm and a full-load speed of 1720 rpm. Calculate the slip and the electrical frequency of the rotor at no-load and full-load conditions. What is the speed regulation of this motor?
Q3. A three-phase 60-Hz induction motor runs at 715 r/min at no load and at 670 r/min at full load. (a) How many poles does this motor have? (b) What is the slip at rated load? (c) What is the speed at one-quarter of the rated load? (d) What is the rotor's electrical frequency at one-quarter of the rated load?
Sri K.
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