Research Papers: Gas Turbines: Microturbines and Small Turbomachinery

Losses in High Speed Permanent Magnet Machines Used in Microturbine Applications

[+] Author and Article Information
Co Huynh, Liping Zheng, Dipjyoti Acharya

 Calnetix, Inc., Cerritos, CA 90703

J. Eng. Gas Turbines Power 131(2), 022301 (Dec 23, 2008) (6 pages) doi:10.1115/1.2982151 History: Received April 01, 2008; Revised May 09, 2008; Published December 23, 2008

High speed permanent magnet (PM) machines are used in microturbine applications due to their compactness, robust construction, and high efficiency characteristics. These machines are integrated with the turbines and rotate at the same speeds. This paper discusses in detail the losses in high speed PM machines. A typical PM machine designed for microturbine application is presented with its detailed loss calculations. Various loss verification methods are also discussed.

Copyright © 2009 by American Society of Mechanical Engineers
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Figure 1

Family of hysteresis loops

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Figure 2

Eddy currents in the rotor

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Figure 3

The cross section of a 120 kW alternator (unit is in mm)

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Figure 4

Passive rectifier circuits

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Figure 5

Simulated current waveforms

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Figure 6

Back-to-back test setup

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Figure 7

Measured machine spin-down time versus rotor speed

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Figure 8

Calculated no-load total loss versus speed

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Figure 9

A typical lumped parameter thermal model of a PM machine



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