The development of motors able to reach high rotation speeds is expanding
as the technology is more widely implemented in the industrial field of
permanent magnet synchronous motors.A magnet will shatter when the amount
of stress surpasses the mechanical strength in an SPM motor that uses a
ring magnet. This problem stems from the centrifugal force produced in
a rotor at high rotation speeds. Analyzing the maximum rotation speed of
a motor through simulation to evaluate methods to prevent the magnet from
shattering, such as designing reinforcement rings, becomes highly advantageous
during the design stage.This example analyzes the tensile stress distribution
of a ring magnet when the permanent magnet synchronous motor is rotated
at high speeds.
An IPM motor has a magnet embedded in the rotor, it carries a risk that
the magnet may be displaced or come off the rotor core due to the centrifugal
force. The effects of centrifugal forces on the IPM motor can be analyzed
in JMAG while taking into account the contact between the magnet and the
rotor.
This example presents rotor displacement and stress distribution of an
IPM motor with and without the effects of partial magnet movement.
