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Unformatted text preview: HW 5 Solution 2010 Spring Problem 1: A three-phase four-pole winding is installed in 24 slots on a stator. There are 30 turns of wire in each slot of the windings. All coils in each phase are connected in series, and the three phases are connected in wye connection. The flux per pole in the machine is 0.060 Wb, and the speed of rotation of the magnetic field is 3600 r/min. (a) What is the frequency of the voltage produced in this winding? Solution: The frequency of the voltage produced in this winding is 120 120 / 4 3600 120 = × = = P n f m e Hz (b) What are the resulting phase and terminal voltages of this stator? Solution: There are 24 slots on this stator, with 30 turns of wire per slot. Since this is a four-pole machine, there are four sets of coils (8 slots) associated with each phase. The voltage in the coils in one pair of slots is 960 120 06 . 30 2 2 ≈ × × × = = π φ π f N E C a V There are four sets of coils per phase, since this is a four-pole machine, and they are connected in series, so the total phase voltage is 3840 960 4 4 = × = × = a...
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- Spring '08
- Power, Transmitter power output, Qout, power grid