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The frequency of the EMF in the rotor depends on the difference between the speed of the rotor and the speed of the magnetic field in the stator: f r = p(n s - n) / 60 = pn s g / 60 = f s g EMF of the rotor When the rotor stood still, the difference! in speed of the rotor and the magnetic field of the stator equals the synchronous speed. There is a small rotating stator located on the alternator shaft (rotor). When this stator spins, an AC current is generated (this process consumes mechanical energy from the engine). The AC current flows through a diode bridge mounted on the rotating shaft and is converted to DC current.
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Mar 04, 2014 · Is there any relationship between no of rotor poles and no of stator poles in BLDC motor (or PM Synchronous Motor)? I have read somewhere there doesnt have to be. I can imagine if no of poles are same then each rotor pole would interact with stator pole. But it is difficult for me to imagine if the numbers are unequal. Unevenness in the space between the rotor and stator will affect the alignment of the Rotor Influence Check (RIC) as the rotor is positioned during the test. An uneven alignment such as what is seen in Figure 3 indicates eccentricity exists between the rotor and stator. The more severe the air gap eccentricity, the greater the misalignment. Jul 05, 2020 · The gears have teeth and radii in the ratio 3:2, causing the driveshaft to spin three times faster than the rotor. As it does so, the three corners of the rotor (the “apex seals”) stay in contact with the outer wall of the engine, called its stator, so that the gases in the engine do not leak between different phases. Three-phase induction motor’s stator core is embedded with three-phase symmetrical windings. After the power on, between the stator and rotor produce a rotating magnetic field which rotates at a synchronous speed. The rotor bar is cut by the rotating magnetic field in which produce the induced current.
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Starting & Running current are the three important factors for the rating of AC induction motor. Starting Current, sometimes abbreviated as I start in electrical engineering, is a measure or rating of how much current required for a single or three phase AC motor to get started. 3. What is the advantage of skewed stator slots in the rotor of Induction motors? In the induction motor design, the rotor slots are purposely made with a slight skew arrangement. It will not be parallel to the shaft. This is for the purpose of reducing magnetic locking or reducing magnetic attraction between stator and rotor teeth.
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Oct 24, 2016 · 49. In an induction motor the relationship between stator slots and rotor slots is that (a) stator slots are equal to rotor slots (b) stator slots are exact multiple of rotor slots (c) stator slots are not exact multiple of rotor slots (d) none of the above Ans: c. 50. Slip ring motor is recommended where (a) speed control is required
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Oct 20, 2017 · If you reduce the voltage of an induction motor while keeping the frequency fixed, you reduce the torque available from the motor. It is a square law relationship - a 10% reduction in voltage can lead to a 19% reduction in maximum torque output. The relative motion between the stator flux and rotor flux, the rotor starts to rotate to reduce the cause of relative motion. The rotor tries to catch the stator flux and starts rotating. The direction of rotation is given by the Lenz’s law. And is in the direction of the rotating magnetic field induced by the stator.