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'[PIC]: Motor speed control -was [EE]: mouse emula'
2001\03\08@094806 by John

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Hello Mike & PIC.ers,

>From:    mike bolton <spam_OUTBoltonTakeThisOuTspamFS1.WITH.MAN.AC.UK>
>Subject: [EE]: mouse emulation
>
>Some while ago I designed a mouse emulator for use by a severely
>disabled programmer. He had no hand use but could operate a joystick
..
<snippo>
..
>In response to my previous mailing, is there no-one out there who has
>used a PIC for closed-loop motor speed control?

..
I've done this quite a bit.
Generally, I've had to close the loop with motors of ~0.5 kW size,
either 200vdc shunt, or 3ph AC induction types.
The actual drives are usually bought-in units -there are plenty of
suppliers at competitive prices.

Speed sensing by slotted opto-coupler, in the old days.
Now I use Hall-Effect magnetic sensors with a magnet or two mounted
on the rotating shaft.  These are a lot less subject to variations
in sensing distance, dust, muck, etc.

Rather than clod the piclist with BW, email me off-list if you
want more.


       best regards,   John


>
>Mike Bolton
>
>
>
>Dr Mike Bolton
>Clinical Engineering


e-mail from the desk of John Sanderson, JS Controls.
Snailmail:          PO Box 1887, Boksburg 1460, Rep. of South Africa.
Tel/fax:            Johannesburg  893 4154
Cellphone no:   082 741 6275
email:                .....jsandKILLspamspam@spam@pixie.co.za
Manufacturer & purveyor of laboratory force testing apparatus, and related
products and services.

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2001\03\08@095553 by Roman Black

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John wrote:

> >In response to my previous mailing, is there no-one out there who has
> >used a PIC for closed-loop motor speed control?
>
> ..
> I've done this quite a bit.
> Generally, I've had to close the loop with motors of ~0.5 kW size,
> either 200vdc shunt, or 3ph AC induction types.
> The actual drives are usually bought-in units -there are plenty of
> suppliers at competitive prices.
>
> Speed sensing by slotted opto-coupler, in the old days.
> Now I use Hall-Effect magnetic sensors with a magnet or two mounted
> on the rotating shaft.  These are a lot less subject to variations
> in sensing distance, dust, muck, etc.
>
> Rather than clod the piclist with BW, email me off-list if you
> want more.


John, some of us here on the PIC list like
to hear about small motor apps. I am just about
to convert a bicycle to electric power, and
having gathered all the info it looks like
0.5kw (2/3hp) motor is just about the right size.

I would like to hear what you have done and
where you get the motors. :o)
-Roman

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