DC Motor Question

rikrobson · Aug 3, 2015

Its a PWN source, ususally a micro contriller like an arduino. there are also H-Bridge contriller chips available. then some high power mosfets and some other bits and bats.

Maker · Aug 3, 2015

rikrobson said:
Its a PWN source, ususally a micro contriller like an arduino. there are also H-Bridge contriller chips available. then some high power mosfets and some other bits and bats.

Don't forget the 130 volt power supply. It all sounds easy enough.

rikrobson · Aug 3, 2015

You'll probably find thata its eay for the 'muricuns to use their 120 line voltage rectified easily enough.
the first problem we have is to step it down from 230V or get an inverter to supply 130ish VDC

does the lathe not have a gearbox then? Does it realy need to be variable speed? can you use 1450 or 2850 RPM?

DanielW · Aug 3, 2015

Windy Miller said:
It's definitely 130v.

There is a problem with the control board, possibly the speed sensor, otherwise I would do what you suggest. The speed adjustment is push button, but I guess it could be converted to a remote rotary control.

My original intention was to do just what you suggested, but the board won't work.

Any thoughts on the angled brushes?

Whats the name and model of the treadmill? I'm not too sure now but I plugged a treadmill motor up to my mini lathes controller and the motor worked put was pulsing so I guess the controller didn't like permanent magnet motor?

I was going the same route as you but instead of buying the complete treadmill I opted just buying a motor(wrong way to do it) so the thought now is buying a complete treadmill or go the DC motor route and VFD,I have a brand new brushless 1.5Hp motor but the VFD's seem to be very expensive.

Windy Miller · Aug 3, 2015

The treadmill is (was) a Tunturi J660.

The current lathe motor is an AC job, so no controller - just an Fwd - Off - Reverse switch

TBH I don't care how I get the job done, as long as I get a more powerful motor, with variable speed and reverse. AC or DC, PWM or VFD. As long as I get it sorted!

DanielW · Aug 3, 2015

Windy Miller said:
The treadmill is (was) a Tunturi J660.

The current lathe motor is an AC job, so no controller - just an Fwd - Off - Reverse switch

Weird,you have to have a controller for varying speeds in metal turning.

Enquire about the 180v and 90v as some supplys can altered for the their output with a variable resistor onboard,so the 90v if variable? might take it to 120v which will suffice.

DanielW · Aug 3, 2015

This might help?

http://bedair.org/Tmotor/Tmotor2.html

http://www.plccenter.co.uk

http://bedair.org/9x20camlock/9x20project.html

DanielW · Aug 3, 2015

I don't know if this is the controller in the above link? but it worth enquiring.
Unusual site that not giving the specs on what it can do.

http://www.plccenter.co.uk/en-GB/Buy/KB ELECTRONICS/KBMM225D9451

DanielW · Aug 3, 2015

Could be one of the KBIC-240D ?

http://www.plccenter.co.uk/en-GB/Se...Grid-size=50&CategoryChange=false&Grid-page=2

Pete. · Aug 3, 2015

DanielW said:
Weird,you have to have a controller for varying speeds in metal turning.

Speeds are changed by belts and pulleys.

I reckon that 1.5hp is over-powering that machine so I would say that a 130v controller would be just fine. You'll lose some top-end speed and a bit of torque but you can adjust by belt and still have way more power than the lathe can cope with.

Otherwise you can make a very basic variable DC controller using a phase-angle device and a bridge rectifier.

DanielW · Aug 3, 2015

I doubt whether the motor is 1.5Hp,more like just under 1Hp.

Maker · Aug 3, 2015

rikrobson said:
You'll probably find thata its eay for the 'muricuns to use their 120 line voltage rectified easily enough.

Once their 120 VAC is rectified and smoothed with a capacitor it'll be about 165 - 170 VDC. We'll get about 320 VDC from our mains. I don't know what an efficient way of dropping this down to 130 volts (or 180 volts) would be. An H bridge and the PWM circuit sounds easy enough but the power supply to start with has got me stumped.

Windy Miller · Aug 3, 2015

DanielW said:
This might help?

http://bedair.org/Tmotor/Tmotor2.html

http://www.plccenter.co.uk

http://bedair.org/9x20camlock/9x20project.html

That's one of the sites that I've been looking at and getting all my info and ideas from'

DanielW said:
I don't know if this is the controller in the above link? but it worth enquiring.
Unusual site that not giving the specs on what it can do.

http://www.plccenter.co.uk/en-GB/Buy/KB ELECTRONICS/KBMM225D9451

DanielW said:
Could be one of the KBIC-240D ?

http://www.plccenter.co.uk/en-GB/Search/Advanced?Manufacturer=KB ELECTRONICS&PromoFlag=False&InStockFlag=False&SearchMethod=contains&currency=GBP&Grid-size=50&CategoryChange=false&Grid-page=2

All this is above my head to be honest - I need to do some more homework!

Pete. said:
Speeds are changed by belts and pulleys.

I reckon that 1.5hp is over-powering that machine so I would say that a 130v controller would be just fine. You'll lose some top-end speed and a bit of torque but you can adjust by belt and still have way more power than the lathe can cope with.

Otherwise you can make a very basic variable DC controller using a phase-angle device and a bridge rectifier.

It's a 130v controller that I can't find Pete! Do you think a 90v controller would be ok on the 130v motor? If so I'd be more than happy with it. At the end of the day, changing the belts is not a massive hardship!

DanielW said:
I doubt whether the motor is 1.5Hp,more like just under 1Hp.

Although it's an Italian treadmill, the motor is made in the UK, and the company is still trading so I can always contact them to find out the true specs of the motor

Pete. · Aug 3, 2015

You'll be at 2/3 power but in all honesty you won't suffer for it, especially if it's a high-rpm motor and you have to gear it down heavily.

Maker · Aug 3, 2015

Windy Miller said:
It's a 130v controller that I can't find Pete! Do you think a 90v controller would be ok on the 130v motor?

It will rotate off a 9 volt battery, albeit slowly :whistle:

. I hooked mine up to 28 volts (biggest power supply I have), it drew 0.3 amps and turned at 600 RPM.

Windy Miller · Aug 3, 2015

Pete. said:
You'll be at 2/3 power but in all honesty you won't suffer for it, especially if it's a high-rpm motor and you have to gear it down heavily.

It's 2800 rpm.

So it looks a 90v controller will be ok? Good stuff! I'll order one tonight then. And a DRO for rpm!

Thanks very much for your advice guys! :hug:

Pete. · Aug 3, 2015

Gonna need a big reduction for that.

DanielW · Aug 4, 2015

Windy Miller said:
That's one of the sites that I've been looking at and getting all my info and ideas from'

All this is above my head to be honest - I need to do some more homework!

The KBMD-240D
115/230 VAC, THRU 0.75/1.5 HP, 1.0/2.0 HP W/HS, 90/180 VDC ARM

is....
115/240v AC switchable
THRU range of motor from 3/4Hp 2Hp
90/180v DC variable. ARM being short for armature

Got the nice facia panel incorporated as well

Pete. · Aug 4, 2015

DanielW said:
The KBMD-240D
115/230 VAC, THRU 0.75/1.5 HP, 1.0/2.0 HP W/HS, 90/180 VDC ARM

is....
115/240v AC switchable
THRU range of motor from 3/4Hp 2Hp
90/180v DC variable. ARM being short for armature

Got the nice facia panel incorporated as well

Looks pretty slick for £80 http://r.ebay.com/K3A7V2

rikrobson · Aug 4, 2015

Why not just get a bigger AC motor and let the gearbox do the speed control?

DC Motor Question

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