Abstract
The request for high efficiency motor paves the way for the replacement of induction motors with permanent magnet synchronous motors. Although the efficiency is increased, for medium and high power, the current ripple causes significant additional losses in the magnet and lamination; and, high temperature can lead to demagnetization. In this paper, a new rotor topology is proposed and compared to a traditional surface permanent magnet rotor to reduce the magnet losses and protect them from demagnetization. A reference surface permanent magnet machine is compared with the proposed one in terms of performance and magnet losses. Both analytical and experimental analysis are carried out and discussed.
Highlights
The International Electrotechnical Commission (IEC) technical committee has estimated that electric motors cover the 50% of the global electric consumption, which is split in industrial electric motors (30%) and others (20%)
In order to overcome this issue this paper proposes a different rotor configuration where PMs are deep into the rotor, so that they are protected from additional eddy current losses
The interior permanent-magnet (IPM) rotor temperature can only be measured by a thermal camera, while for surface permanent-magnet (SPM) the internal temperature was measured by both thermocouples and a thermal camera
Summary
The International Electrotechnical Commission (IEC) technical committee has estimated that electric motors cover the 50% of the global electric consumption, which is split in industrial electric motors (30%) and others (20%). The urge of reducing global greenhouse emissions paves the way to the demand of more efficiency in electric motor design. In the last twenty years, the improvement of the standardized efficiency class of induction motors (IM) [1] from IE0 class to IE3 class was accomplished by different techniques: . Increasing the motor total stack length for the same output power; changing the design of rotor and stator lamination; employing low losses silicon iron steel; and, substituting the aluminum of the squirrel cage bars with copper bars. The use of the most advanced materials together with variable speed drives lead to new scenarios for high efficiency permanent-magnet (PM) synchronous electric motors. Permanent-magnets synchronous electric motors are intrinsically more efficient than induction motors because of the absence of rotor electric circuit and, of Joule losses. Permanent-magnets synchronous electric motors have higher power factor, since they do not require a magnetization component in the current
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