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| In conjunction with the recent trend toward environmental
protection, the call for energy saving is growing
in the field of motor drives. Additionally, the demand for
smaller motors is also strong as a reflection of miniaturization
of equipment. The IPM motor (Interior Permanent
Magnet Motor) is attracting significant attention as a
solution to meeting this demand. Since the IPM motor
has a permanent magnet inside, it is more efficient than
the conventional induction motor. Moreover, because
it is highly efficient,it can be downsized.In the meantime,
however, the IPM motor is disadvantageous in that it
cannot be driven unless the positions of its magnetic
poles are identified, and therefore it requires a sensor
or the like to detect the polar positions. In this report,
SHI Control Systems, Ltd. (SCS) explains "AF-330," an
inverter that we developed for driving the IPM motor,
which has these characteristics. In particular, SCS focuses
on a drive system (sensor-less drive) that eliminates
the polar position sensor, which is the IPM motor's drawback. |
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