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Research on IPM motors at Uppsala University

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Research on IPM motors at Uppsala University

Thematic workshop on automotive electric drives, Stockholm Juan de Santiago

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 Powerful enough to drive a Volvo V40

 Simple to mount for 1

st

year students

Background and specifications

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 The outer cover (Ytterhölje) is non-magnetic

 No need of epoxy to glue the magnets

The Uppsala concept

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 No flux leakage through the bridges

The Uppsala concept

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 More poles means less end windings

 More coils means thinner cables and more PVC

Number of poles

2 poles and 10 poles motors

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Rotor with 2 and 8 poles

The rotor

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The rotor was mounted magnetized. The new version has a window in the side to insert the magnets.

The rotor

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 Solid poles suffer from tooth ripple losses

The rotor

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 Solid poles suffer from tooth ripple losses

Tooth ripple calculation

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Results in: Juan de Santiago, Hans Bernhoff Calculation of Tooth Ripple Losses in Solid Poles, Electric Power Components and Systems, 2015

Tooth ripple calculation

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The result 2016

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The result 2017

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The result 2018

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Improvement potential

 EMC – End windings are not encapsulated

 Airgap of 4 mm

 Simple inverter control

 Battery limited to 96 V for safety in the lab

References

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