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Drive mechanisms combing air guides and linear motors
are widely used in precision positioning systems. PWM
drives and linear drives have conventionally been used
as representative drive methods for controlling these
devices. However, these drive mechanisms have fluctuations
in accuracy, output capacity and loss, and the
fluctuations have been an obstacle to increasing the size
and accuracy of equipment. To solve this problem, SHI
Control Systems, Ltd. (SCS) has developed a driver system
that provides both high precision and high output
by switching between linear and PWM. By combining
this driver system with a dynamic supply voltage control,
SCS recently developed a drive mechanism that achieves
a low loss comparable to PWM despite being a full-time
linear drive.
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