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AC MOTORS

There are many different types and sizes of electric motors. Electric motors can be divided into two types: Alternating Current (AC) motors and Direct Current (DC) motors. An AC electric motor requires an alternating current, while a DC motor requires direct current. AC motors are further subdivided into single phase and three phase motors. Single phase AC electrical supply is what is typically supplied in a home. Three phase electrical power is commonly only available in a factory setting. The most common single phase AC motor is known as a universal motor. This is because this motor can also run with DC current..continue..


An AC motor is an electric motor driven by an alternating current.
It commonly consists of two basic parts, an outside stationary stator having coils supplied with alternating current to produce a rotating magnetic field, and an inside rotor attached to the output shaft that is given a torque by the rotating field. Where speed stability is important, some AC motors (such as some Papst motors) have the stator on the inside and the rotor on the outside to optimize inertia and cooling..continue..

Siemens detailed discussion and illustration of the basics of an AC motor..continue..

DC or direct current motors work in particular situations whereby the speed of the motor needs to be externally controlled. On the other hand AC or alternating current electric motors are used in a completely different process drawing upon the kind of ac motor being used.DC motors generally characterize a continual and standard current flow. These were infact the first ever kind of motors to be used, the earliest form, whereas, the single phase AC motors are precisely termed as the general purpose motors which can be used in variant situations irrespective of the quality of the current flow.

Upon completion of this chapter you will be able to:
  • List three basic types of ac motors and describe the characteristics of each type.
  • Describe the characteristics of a series motor that enable it to be used as a universal motor.
  • Explain the relationships of the individual phases of multiphase voltages as they produce rotating magnetic fields in ac motors.
  • Describe the placement of stator windings in two-phase, ac motors using rotating fields.
  • List the similarities and differences between the stator windings of two-phase and three-phase ac motors.
  • State the primary application of synchronous motors, and explain the characteristics that make them suitable for that application.
  • Describe the features that make the ac induction motor the most widely used of electric motors.
  • Describe the difference between the rotating field of multiphase motors and the "apparent" rotating field of single-phase motors.
  • Explain the operation of split-phase windings in single-phase ac induction motors.
  • Describe the effects of shaded poles in single-phase, ac induction motors
  • .continue..
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