Overview
Closeup |
A magnetized magnet needs a careful handling at the time of assembling
a motor, so it is useful to magnetize the magnet after placing it in the
motor.
When the anisotropic magnet placed in the motor is magnetized, the effective
magnetization field distribution is determined by the magnetization field
and the orientation of the magnet.
Magnetizing Tool of JMAG can be used to obtain the magnetization field
distribution, taking into account the magnetization field of the magnet
evaluated in advance.
This note presents the use of magnetic field analysis to obtain the magnetization
field used to magnetize a permanent magnet placed in an SPM motor and also
to obtain the surface magnetic flux density of the magnet. |
Magnetization Field
| Figure 1 shows the magnetization filed distribution, generated by the current
in the stator coils. The magnetization field between poles is smaller than
at the center of the pole. The effective magnetization field distribution
is obtained from this magnetization field and the orientation of the magnet. |
Closeup |
Surface Magnetic Flux Density of the Magnet
Closeup |
Figure 2 shows the surface magnetic flux density waveform of the magnet
when the uniformly magnetized magnet is used and when the magnet magnetized
by Magnetizing Tool is used. The orientation of the magnet is parallel
and reverses at 45 degrees, so the surface magnetic flux density differs
substantially between the uniformly magnetized magnet and the magnet magnetized
by the tool. |
|
