A) Although the magnetic field for each phase of a 3-phase induction motor is merely switching back and forth between north and south poles, the resultant magnetic influence from all phases sets up a rotating magnetic field to cut the rotor conductors. a) true b) false B) In a two-pole stator winding of a 3-phase motor, how many revolutions does the rotating magnetic field make in one cycle of the electrical current? a) one b) 60

9. The synchronous speed of a three-Phase induction motor depends on the number of magnetic poles in the machine and the actual speed of rotation the actual speed of rotation and the applied Voltage in RMS the actual speed of rotation and number of magnetic poles intensity on the rotating magnetic field and the applied Voltage in RMS frequency of the applied voltage and the number of magnetic poles in the machine

The voltage induced by a 6-pole DC generator running at 600 [RPM] with 100 slots on the armature and each armature coil has 4 turns with a flux per pole of 0.01 [Wb] is

A three-phase four-pole winding is installed in 12 slots on a stator. There are 40 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 A. The flux per pole in the machine is 0.060 Wb, and the speed of rotation of the magnetic field is 1800 r/min. (a) What is the frequency of the voltage produced in this winding? (b) What are the resulting phase and terminal voltages of this stator? SOLUTION (a) The frequency of the voltage produced in this winding is (1800 r/min)(4 poles) n„P f, = 120 = 60 Hz 120 (b) There are 12 slots on this stator, with 40 turns of wire per slot. Since this is a four-pole machine, there are two sets of coils (4 slots) associated with each phase. The voltage in the coils in one pair of slots is E, = 2nN of = /27(40 t)(0.060 Wb)(60 Hz) = 640 V %3D There are two sets of coils per phase, since this is a four-pole machine, and they are connected in series, so the total phase voltage is V, =…