Is STM better than USM?

Started Jun 8, 2012 | Discussions thread
tko
tko
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In reply to Steve Balcombe, Jun 13, 2012

I'd say a screw drive is a screw driving a gear. So one gear. Half a gear? Half track? It's still a drive mechanism.

Yeah, I hate to admit owning many belt drive turntables. The trick was tiny rubber bands, tiny motors, and huge platters that took forever to get started.

My point is that, at the functional level, a stepper motor and a high performance motor are similar. Similar size, shape, and function. Maybe the STM is a more sophisticated motor, but both work with poles, magnetization, some type of pulse control. Only some of the internal features are different.

But a USM ring drive is fundamentally different. Uses voltage and piezoelectric resonant waves to move a ring with no gears. The ring is the motor. Only one moving part - the ring. Kind of cool.

And yes, I was around, reading technical notes, when the USM was invented.

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