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Re: How does the Valhalla and Lingo work?

Posted by AR guy on March 24, 2002 at 23:11:09

In Reply to: How does the Valhalla and Lingo work? posted by Thomas on March 24, 2002 at 16:20:59:

Well I cannot pretend to know a great deal more about how they work either but I do know both the Lingo and the Valhalla use crystals to generate their sine waves. The DIY one I build used an oscilator circuit for what it's worth.

The Lingo is direct coupled and offers separate drives for both phases of the motor.

The Valhalla uses only one drive for both phases of the motor with a single capcitor to achieve close to 90 degrees phase shift between them.

I do not remember the Valhalla or Lingo changing voltages except for the Lingo in 45 RPM only - it took some time to get up to speed and change modes. Both also put out around 80 volts when measured during use. My experiments with similar circuits and motors suggest that you need at least 60 volts not only to get up to speed but to navigate difficult passages.

I don't know what the Axis motor control board does but it looks like a pretty simple circuit and I'd wonder if if even generates a proper sine wave or just makes do with a square or trangle wave which are far easier to achieve.

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