Author Topic: Soft Start for Warco VMC motor  (Read 289 times)

Offline JerryNotts

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Soft Start for Warco VMC motor
« on: September 10, 2017, 10:17:38 AM »
I have a VMC which always starts by going from 0 rpm to full revs almost instantaneously. This is accompanied by the whole machine rocking an almost imperceptible amount. If nothing else it makes me jump in surprise the first time I start it in any session.
Can anyone  suggest a mod to make it 'soft start'? Short of installing a VFD. :zap:

Jerry

Offline JerryNotts

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Re: Soft Start for Warco VMC motor
« Reply #1 on: September 12, 2017, 03:27:55 AM »
Aha. Perhaps the silence on this subject indicates that I might be on a loser!
I'll have to look seriously at a VFD system then.
Jerry :bang:

Offline John Rudd

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Re: Soft Start for Warco VMC motor
« Reply #2 on: September 12, 2017, 03:59:07 AM »
First thing I did with my 626 was junk the oem motor in favour of a 3 ph and vfd.....

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Offline Will_D

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Re: Soft Start for Warco VMC motor
« Reply #3 on: September 12, 2017, 04:05:31 AM »
Try using a 3kw dimmer switch. We use them on our boilers (homebrew) but also I have used it to control a vacuum cleaner motor. They are very cheap on ebay . Worth a try
Engineer and Chemist to the NHC.ie
http://www.nationalhomebrewclub.ie/forum/

Offline John Rudd

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Re: Soft Start for Warco VMC motor
« Reply #4 on: September 12, 2017, 04:36:09 AM »
Dimmer switches use a triac or scr and as far as  I know are not suitable for induction type  motors as per the vmc.

I stand to be corrected of course.....
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Offline JerryNotts

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Re: Soft Start for Warco VMC motor
« Reply #5 on: September 12, 2017, 10:05:50 AM »
Thanks John,

All along I had felt that VFD might be the way to go, but as I have aged I find myself les able to spend money?
Looks like I should open discussions with Transwave.
What supplier did you use?

Can you advise what current your circuit needs please?

Will I am a mere chemist  the idea of experimenting with  dimmer switches etc is beyond my pay grade. In any case the Mill full load current is around 8 amps (1.25 HP) would a dimmer switch carry that current for the type of running a mill would undertake?

Jerry

Offline RussellT

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Re: Soft Start for Warco VMC motor
« Reply #6 on: September 12, 2017, 11:04:39 AM »
How is the motor mounted?  Is it possible to arrange a mechanical soft start? I'm thinking of something like a motor that's free to move but taking up the torque reaction with a spring.

Russell

Offline John Rudd

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Re: Soft Start for Warco VMC motor
« Reply #7 on: September 12, 2017, 11:24:16 AM »
Russell,
The motor is mounted on a vertically hinged plate that pivots to set the primary belt tension.
It is conceivable that this could be the springboard for a mechanical soft start.

Jerry,
I used Engineers  mate, a supplier on ebay but called them directly for a better deal.
I got a 1.1k motor from them and an Invertek inverter rated at 1.5 kw, cost was circa 260 inc delivery.
I avoided going to companies like Transwave, simply because they are overly expensive. ( shout me down anyone...I dont care...)
I previously converted my Chester Eagle 30 using the same motor and a cheaper inverter from ebay.
My large lathe, from SPG tools has had the same treatment as has my Chester 9 x 20 lathe, so conversions of this nature are not alien to me....
The control side of the conversion is straight forward too, but then my techie background does help

shout up if you need any help...
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Offline JerryNotts

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Re: Soft Start for Warco VMC motor
« Reply #8 on: September 12, 2017, 12:02:48 PM »
Thanks John,
 No doubt I'll be in touch.
I'll look at the e-bay site you mention first.
Jerry

Offline John Rudd

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Re: Soft Start for Warco VMC motor
« Reply #9 on: September 12, 2017, 02:12:35 PM »
Here is a suitable motor...

http://www.engineersmate.com/products/4-POLE-MOTORS/P252302

Suitable inverter.....

http://www.engineersmate.com/products/IP20-INVERTERS/P252107

I suggest you call them and ask for a combined price, hopefully you may get a discount... :)

eccentric millionaire financed by 'er indoors
Location:  near Hull

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