Re: [CAD_CAM_EDM_DRO] DC Brushless Motors and Drives

natchamp_87 wrote:

>I have an opportunity to buy some very good DC brushless servo motors
>for my Bridgeport retrofit project. However, the motors will be
>little more than paper weights unless I have drives and a
>controller. Since Gecko's drives arn't anywhere on the horizon, is
>there any other cost effective solutions out there for brusless
>drives and controllers? I need to make a decision promptly, so any
>feedback is greatly appreciated.
>
>

Yes, look at Copley Controls http://www.copleycontrols.com/ they should
have a servo
amp that will drive these motors. I think the sinusoidal brushless
amplifier series (under
motion/amplifiers) is what you are looking for. There is some matching
up to do so that the
encoder provides the right signals for the motor's commutation. Most
modern servo amps figure
out the commutation by counting out encoder ticks from the index, but
then they need to
know how many poles the motor is and how many lines the encoder has.

Older systems had commutation signals from the encoder in addition to
the quadrature
encoders signals.

Jon