Single Phase and Permanent Magnet Machines

____________ operates on the principle of electromagnetic induction. When an alternating current flows through the stator winding, it produces a rotating magnetic field.

Also called as Resistance Start Motor. It has a single cage start rotor. It consists of a stator, a rotor, a centrifugal switch located inside the motor, two end shields housing the

bearings that support the rotor shaft.

to overcome the lack of sufficient starting torque that is characteristic of split-phase motors a capacitor is provided to the auxiliary-winding circuit. The capacitor causes the auxiliary-winding and main-winding starting currents to be nearly out of phase by 90 electrical degrees.

Two different capacitance values are utilized because the starting capacitor value is much too large for the running performance. The running capacitor (oil type capacitor or polymer type capacitor) must have a continuous-duty rating and the starting capacitor must have a short-duty rating (electrolytic capacitor).

a type of Split-phase in which a single capacitor is permanently connected in the auxiliary-winding circuit. The starting torque of this type of motor is about 50 to 100 percent of the rated torque.

A ____________ is a type of single-phase induction motor that uses a shading coil to create a rotating magnetic field.

It compose a well-known class of machines used in both

the motoring and generating modes. It have been used for many years in applications where simplicity of structure and a low initial cost were of primary importance.

__________ generate a flux field in the rotor. The stator generates a field that interacts with the rotor’s magnetic field.

Are metallic alloys of aluminum, nickel, iron, and cobalt. First high-energy PMS to be developed.

Properly defined as ferrite oxides of barium or strontium. Most widely used of any PM types in almost all applications, including rotating machines.