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A Discourse on Induction Motors

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A Review of Induction Motors

Pattinson Hayton

California State University, Long Beach

College of Engineering


Thus far in Energy Conversion and Principles, the topics of direct current, or DC, and synchronous motors have been covered and discussed. A direct current exists in the field windings of both of these motors and an alternating current, or AC, exists in the armature windings of both of these motors. Electrical power is delivered right to the armature of a DC motor using a commutator, or the moving part of the rotary, in these motors. Because of this, a DC motor with this type of connection can also be referred to as a conduction motor. Conversely, if a motor receives power by induction, rather than by conduction, the motor is called an induction motor. An induction motor is therefore a type of transformer that possesses a rotary secondary winding. As discussed previously, both DC and synchronous motors are doubly-fed. An induction motor, however, is a singly-fed motor. With these motors being singly-fed, the construction of is different than that of other motors. These motors do not require slip-rings, a commutator, or brushes. With these components absent from induction motors, it is thus seen that there are no moving contacts between the stator and rotors, which is obviously quite different than the structure of DC and synchronous motors.
Induction motors are useful due to their efficiency. The absence of brushes in induction motors eliminates both the electrical loss (due to the brush voltage drop) and the mechanical loss (due to friction between the brushes and commutator); thus in the power-flow diagram of induction motors (see Appendix), one will notice the absence of the power friction variable. The lack of moving parts in induction motors results in a nearly maintenance free motor that is stable and reliable. In these motors,…...

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