1. A three-phase ac linear motor has armature winding wavelength of 30 cm. The supply currents have a frequency of 75 Hz.
(a) Calculate the linear velocity of mmf wave.
(b) The vehicle velocity of the motor is synchronous type.
(c) The vehicle velocity of the motor is induction type with a slip of 0.05.
2. The armature of three-phase linear motor has a winding wavelength of 25 cm and winding length of six wavelength. The
3-phase winding has 240 turns/phase with a winding factor of 0.92. For an air-gap 0.95 cm it is desired to have peak fundamental air-gap flux density of 1.25 T. Calculate the rms value of armature currents needed.