Induction motor
A wide variety of induction motors are available and are currently in use throughout a range of industrial applications. Induction motors typically include a rotor that rotates in response to a rotating magnetic flux generated by alternating current (AC) in a stator associated with the rotor. A rotational speed differential between the rotor and the rotating flux induces a current through a rotor cage. A rotor cage consists of a single aluminum casting having several conductive bars that run axially through the rotor and are joined at each end by two conductive end rings. Current induced in the bars creates a magnetic flux that opposes that of the stator, thus providing the rotor with rotational torque. The stator and rotor may be mechanically and electrically configured in a variety of manners depending upon a number of factors, including: the application, the power available to drive the motor, and so forth. The induction motors are divided again into an inner rotor type induction motor and an outer rotor type induction motor in accordance with relative positions of rotors and stators. The inner rotor type induction motor is generally applied to a washing machine or the like, and includes the rotor inside the stator. The ability to accurately determine the speed of a rotating rotor with respect to a stationary stator within an induction motor is vitally important to the every day operations of induction motors. A flat induction motor is a motor which has a disk-shaped stator and rotor placed coaxially around a rotating shaft with their surfaces opposing each other. Normally, the stator core and rotor core each have a spiral winding structure made of a magnetic steel strip. A plurality of open slots are formed in the winding structures from the outer edge toward the rotating shaft at equal intervals, leaving part of the magnetic steel strips. Single phase induction motors are normally provided with a cage type rotor and a coiled stator having two windings, one being for the running coil and the other for the starting coil. Single phase induction motors are widely used, due to their simplicity, strength and high performance. They are used in household appliances, such as refrigerators, freezers, air conditioners, hermetic compressors, washing machines, pumps, fans, as well as in some industrial applications. Linear induction motors are widely used in a number of industries and present certain advantages over rotary motors, particularly where propulsion along a predetermined path or guideway is required.
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