Re: [CAD_CAM_EDM_DRO] Digest Number 2211

The Taig CNC mill uses a bi-level unipolar design.

Regards,
Tony

At 16:00 06/04/2002 +0000, you wrote:

>There IS one more stepper drive type which has found good success and
>is not often mentioned on this forum.
>
>It is the Bi-LEVEL drive; and Anaheim Automation is one supplier.
>Hundreds of these were used in Digital Tools' Dr series of routers in
>the early 90's...
>
>This drive type has the advantage of not "chopping", and therefore is
>both electrically and audibly quiet.
>
>The way it works is to use TWO power supply voltages. The higher is
>called the "kick" voltage, and it performs as does the higher voltage
>in other drive types. However, after a short burst of this high
>voltage the drive switches to a lower voltage to maintain the holding
>torque whilst not overheating the motor. Two levels of voltage,
>making a bi-level drive. Properly adjusted, performance is similar
>to "chopper" types.