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Influence Of An Oversized Induction Motor On The IGBTs Of A Voltage Source Inverter
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| Author(s) |
Bertil Braennbacka, Timo Vekara |
| Abstract |
For economical reasons industry and other endusers
of motor drives often have easily available – even in
their storage – a preferred set of motor types. An oversized
motor could provide a solution for future additional power
needs in excess of that recommended by the vendos and
selected by the designers. This paper describes the influence
on the insulated gate bipolar transistors (IGBTs) in a voltage
source frequency converter if an oversized induction motor at
a partial load is used instead of the rated-sized (or smaller)
motor with nominal load.
In this study, two frequency converters (105 A and 205 A)
and three squirrel-cage induction motors (103 A, 160 A, and
279 A) were first modeled and simulated in the time domain
and then measured. The rated current of the oversized motor
was 1.36-1.60 times the continuous current of the inverter.
It was found out that at the inverters rated current the
oversized motor produces such high ripples in the motor
current and thus increases the temperature of IGBT modules
so much that the lifetime of the IGBTs would noticeably
reduce. Therefore, an oversized motor cannot be
recommended for the applications where the expected lifetime
is several years. |
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| Filename: | A71418 |
| Filesize: | 204 KB |
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| Type |
Members Only |
| Date |
Last modified 2006-02-17 by System |
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