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The advantages of using permanent magnets (PM) in electric motors to increase efficiency are well documented [1]. Due to the synchronous operating nature of a PM motor, most motors of this type are used in combination with a variable frequency drive (VFD). PM motors capable of direct on line (DOL) starting have been manufactured for over 30 years [2], but the application of this technology has historically...
The harmonic and transient finite element method (FEM) are used to determine the starting and operational characteristics of a large induction motor (IM). The starting properties of the initially proposed motor are strongly degraded by parasitic asynchronous crawling tendencies and the motor is unable to achieve the nominal rotor velocity. It is shown in this paper that, when analyzing the IM using...
Induction motor squirrel cage rotor winding performance operating range and reliability are influenced by the temperature of these windings and the temperature differences which occur within the windings, and between the windings and other parts of the rotor structure. These temperature responses have formed a basis for protective devices commonly in use to protect the winding from damage. This paper...
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