RE: [CAD_CAM_EDM_DRO] Re: Digispeed PWM motor controller

Ballendo,

Thanks for your kind words. Yes, tomorrow I head to Sydney for the
Australian Cycling Championships to try and qualify for the Athens
Paralympics. If you are interested have a look at:
http://www.homanndesigns.com/Cycling.html

As to the status of the DigiSpeed controller. I currently have 24 of them in
various stages of construction. Most are complete except for the 3.5mm
stereo jack socket. These are supposed to have arrived this week. I haven't
seen them yet. Even if they turn up today I'm not going to be able to finish
putting the DigiSpeed controllers together until I return. So, they should
all be shipped by May 7th.

The DigiSpeed will do a good job at controlling your dc motor. The micro
controller and logic circuit is opto-isolated from the dc motor controllers
circuitry, which is usually at MAINS POTENTIAL.

The DigiSpeed allows you to control the output voltage in the same manner as
a potentiometer. It has 3 wires that connect in place of the dc motor
controllers original potentiometer. It allows for 1024 steps from 0V to the
maximum voltage that was suppling the original potentiometer, usually around
12V.

The output voltage is very linear throughout the 0% to 100% range.

One of the neat features is that the controller can be configured to
compensate for the drag and friction in the motor and drive system. This
allows for a much greater linear relationship between the desired set speed
and actual speed.

From some of the testing I have done, I've had the actual speed error be
less than 50rpm across the range of 400rpm to 4000rpm.

Once the speed gets down to less than 10% of maximum, it gets harder to
maintain an accurate speed due to cogging in the motor. I overcome this by
changing the pulley settings on my Taig Mill.

Have a look at http://www.homanndesigns.com/DigiSpeedDeal.html for more
info.

BTW. I've just placed an order with the pcb house for another 24 pcbs. I
should have them in about 10 days. This should cater for the current
backlog.

Cheers,


Peter Homann
mailto:Peter.Homann@...
Adacel Technologies Limited,
250 Bay St, BRIGHTON, 3186, AUSTRALIA
http://www.adacel.com <http://www.adacel.com>
Telephone +61 (3) 8530 7777, Facsimile +61 (3) 9596 2960
Mobile 0421-601 665

> -----Original Message-----
> From: ballendo [mailto:ballendo@...]
> Sent: Friday, 23 April 2004 7:38 AM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: [CAD_CAM_EDM_DRO] Re: Digispeed PWM motor controller
>
>
> Hello,
>
> That would be Peter Homann, and the site is at:
>
> http://www.homanndesigns.com/
>
> FWIW, Peter is a world class cyclist, (and multiple world record
> holder!) who is currently training for the Australian National
> Championships which take place next week. Next up, Athens...
>
> Just a heads up, since communication may be affected. I worked with
> him on the Digispeed project, and it's a very nice solution, IMO.
>
> Ballendo
>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "snagglexr650"
> <snaggletto@c...> wrote:
> > Hello,
> > A while back somebody posted a link to a "Digispeed" PWM DC
> motor
> > speed controller that will take signals from Mach2 etc. The link
> has
> > since gone down. Any word on what happened to him and his product?
> >
> > Are there any popular alternatives for software controlled DC
> motor
> > speed controls? I'm looking at some DC treadmill motors to be used
> > as a programmable cnc spindle motor. Thanks.
>
>
>
>
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