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120 - Thermal Demagnetization Analysis of an SPM Motor
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Module:DP |
2011-07-12 |
Demagnetization may occur in an SPM motor during rotation because of the
rising temperature caused by the eddy currents, or the reverse magnetic
field produced by the coil in the permanent magnet.The need to evaluate
the demagnetization using a magnet field analysis is becoming more important
because demagnetization reduces the performance of an SPM motor.The mechanical
characteristics need to be evaluated accounting for demagnetization caused
by rising temperatures while the motor is driven, because the demagnetization
is irreversible even after the temperature decreases once the operating
point of the magnet exceeds the knee point.
This example presents the use of a magnetic field analysis to evaluate
the torque waveform and demagnetization of an SPM motor while changing
the temperature of the permanent magnet.
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34 - Demagnetization Analysis of an SPM Motor
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Module:DP |
2011-07-12 |
When a motor is rotating, the permanent magnet in the motor can be demagnetized
due to the temperature rise caused by the eddy current loss and the reverse
magnetic field generated by the coil. As the demagnetization of the permanent
magnet reduces the motor performance, it is important that the demagnetization
can be evaluated with magnetic field analysis. This note presents the use
of a magnetic field analysis of an SPM motor to evaluate how the demagnetization
caused by the reverse magnetic field change with varying current flow.
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