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speed control for a 3/4 hp induction motor (Read 672 times)
 
Bill Godber
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record coronet no.3
speed control for a 3/4 hp induction motor
Mar 9th, 2017 at 11:24pm
 
My record c3 lathe will run as low as 515 rpm with the pulley settings and I'd like it to run slower for larger pieces. What do you use for an outboard induction ac motor controller? Thanks in advance for the help
Bill
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Bert Delisle
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Re: speed control for a 3/4 hp induction motor
Reply #1 - Mar 10th, 2017 at 1:10am
 
Swap you single phase motor for a three phase motor and use an inverter. Many small inverters available that can use single phase input and output variable three phase. Usually 220v.
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Bob Mezzatesta
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Re: speed control for a 3/4 hp induction motor
Reply #2 - Mar 10th, 2017 at 7:37am
 
Bert is right. There is no way to control the speed of that motor. The bad news is that the conversion to 3phase isn't cheap. $3-400 range. I converted my Delta 1460. Works great.
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Ken Vaughan
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Re: speed control for a 3/4 hp induction motor
Reply #3 - Mar 10th, 2017 at 9:26am
 
Bill,

The really old school way was to put a jack shaft between the motor and lathe wheels.

The modern way uses the variable frequency drive and motor combination.  The price has been dropping the last few years and the technology is down to 110 volts at a reasonable (few hundred dollars).

The dull side is that there are a number of potential settings to work through to get a best match for your turning style ==
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Bill Godber
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record coronet no.3
Re: speed control for a 3/4 hp induction motor
Reply #4 - Apr 2nd, 2017 at 11:46am
 
The jack shaft or sheave size change isn't an option on the record c3 so after some searching I found an invertek vfd with single phase in and out that meets the need. Not cheap but I had some extra cash from winding down another hobby and went for it.
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Ken Vaughan
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Re: speed control for a 3/4 hp induction motor
Reply #5 - Apr 2nd, 2017 at 6:59pm
 

Bill, let us know how that controller works out with your motor.  My experience has been with using 3 phase motors.  Looking to learn from your experience.

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Bill Godber
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record coronet no.3
Re: speed control for a 3/4 hp induction motor
Reply #6 - Apr 4th, 2017 at 8:35pm
 
Ken Vaughan wrote on Apr 2nd, 2017 at 6:59pm:
Bill, let us know how that controller works out with your motor. My experience has been with using 3 phase motors. Looking to learn from your experience.


I hooked up the controller today and it seems to work well.Its output is displayed in freq to the motor so the actual speed is a bit of an estimate but it will slow the lathe down to a crawl and make it go faster than I was comfy with.I set 3 different freq's 20 30 and 40 cps and let each speed run for 30 mins with no overheating issues and it's strong enough to remove chips without noticeable slowing.I'm releived and pleased.
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Bob Mezzatesta
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Re: speed control for a 3/4 hp induction motor
Reply #7 - Apr 5th, 2017 at 6:02am
 
Are you saying you are speed controlling a single phase motor? Can you supply make and model? There would be a lot of people interested in that.
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Bill Godber
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record coronet no.3
Re: speed control for a 3/4 hp induction motor
Reply #8 - Apr 5th, 2017 at 1:07pm
 
Yep single phase 115v in and single phase 115v out. The make is an Invertek E2.Max amps out for my model is 10.5A But there are lots of options available.Here's a link

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Grant Wilkinson
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Re: speed control for a 3/4 hp induction motor
Reply #9 - Apr 5th, 2017 at 2:14pm
 
Bill: Would you mind posting where you got it?
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Grant Wilkinson
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Bill Godber
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record coronet no.3
Re: speed control for a 3/4 hp induction motor
Reply #10 - Apr 5th, 2017 at 2:55pm
 
edit to add mine is an Optidrive E2 model
#ode-2-21007-1hb42-01 and I got mine from Westshore Controls Their contact Robert was very helpful.

Their website lists 2 canadian dealers.

Canada

EE Controls Ltd

17 Stewart Court
Orangeville
Ontario
L9W3Z9

Contact Name: Brad Taylor
Telephone: 1-519-941-6845

Email: info@eecontrols.on.ca
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Westshore Controls

1431 DUNCAN DRIVE
DELTA
BRITISH COLUMBIA
V4L1R5

Contact Name: ROBERT OLDHAM
Telephone: 01 604-817-0987

Email: WESTSHORECONTROLS@GMAIL.COM
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Not cheap but theirs was the only one I could find that is single phase in and out.
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« Last Edit: Apr 5th, 2017 at 4:06pm by Bill Godber »  
 
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Bob Mezzatesta
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Re: speed control for a 3/4 hp induction motor
Reply #11 - Apr 5th, 2017 at 4:26pm
 
Very interesting! I went to the website but there was no pricing. Would you mind revealing your cost?
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Bill Godber
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record coronet no.3
Re: speed control for a 3/4 hp induction motor
Reply #12 - Apr 5th, 2017 at 4:47pm
 
Taxes in I paid a little over $600. Best thing to do is call them and ask for a price, you may do better.
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Bob Mezzatesta
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Delta 1460 w/1hp 3ph &Vfd
Re: speed control for a 3/4 hp induction motor
Reply #13 - Apr 5th, 2017 at 6:35pm
 
That is a bit pricey! In certain circumstances I can see that might be the only alternative. I think your lathe might be an example of a motor that would be difficult to swap.
Thanks for this as I hadn't heard of this development.
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Bill Godber
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record coronet no.3
Re: speed control for a 3/4 hp induction motor
Reply #14 - Apr 5th, 2017 at 9:11pm
 
Pricey yes indeed but the cheapest option I had. The Records motor mount makes it impossible to change sheaves and hard to change out the motor. Record has a variable speed option with a controller and a 3 phase motor for about $1200 cdn. I was lucky to have a little cash from selling off gear from another hobby.Now I have to learn to make more than just piles of chips.
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