Like David, I'm also using a PM DC motor (90VDC - 2500 RPM) without any problems, and typically run it at around 60VDC which is where the coil's performance seems to be best in terms of break-rate (8 contacts on wheel).
What I'm using, and fairly cheap:MAGNETEK 90 VOLT DC MOTOR 1/2 HP 2500 RPM 5.7 AMPS POWERFUL EVEN AT 31 VOLTS ! | eBay
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MAGNETEK 90 VOLT DC MOTOR 1/2 HP 2500 RPM 5.7 AMPS POWERFUL EVEN AT 31 VOLT...
For sale is a massive permanent magnet DC motor. It started running at 5 V. This motor runs very smooth and very... | |
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Terry
From: David Rieben <drieben@xxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Sent: Tuesday, November 27, 2018 7:33 AM
Subject: Re: [TCML] Motor Needed for RSG
That’s exactly what I do for the rotary gap motor for my big coil. It is actually 2.5 hp, 3500 rpm, 130 vdc motor that is from a treadmill and I use a variac (through a fwb rectifier) for infinite speed control. It works like a champ.
David
Sent from my iPhone
> On Nov 26, 2018, at 3:14 PM, Bert Hickman <bert@xxxxxxxxxxxxxxxxxxxxx> wrote:
>
> Tim,
>
> I'd recommend using a simple brushed DC permanent magnet motor, driven from a variac and step-down transformer (if necessary), followed by a full-wave bridge rectifier. Lots of choices out there on and off eBay. These motors are typically used for electric wheelchairs, scooters, and bikes. Something like eBay items 192641960478, 292609497613, or 162327781607 should do the trick.
>
> Good luck,
>
> Bert
>
>
> Tim Flood wrote:
>> I need a small variable speed motor that can be controlled to around 1000
>> RPM. I have searched and searched on line with no results. And, small needs
>> to be around 2" or 3" in diameter if possible.
>>
>> What I have found so far are universal motors rated at 1/15 HP and 5000 to
>> 10K RPM. These motors will not function when run at 1000 RPM.
>>
>> Any ideas, sources or even someone may have one for sale?
>>
>> Thank you and any ideas will be appreciated.
>>
>> Tim
>> _______________________________________________
>> Tesla mailing list
>> Tesla@xxxxxxxxxxxxxxxxxx
>> https://www.pupman.com/mailman/listinfo/tesla
>>
>>
>
>
> _______________________________________________
> Tesla mailing list
> Tesla@xxxxxxxxxxxxxxxxxx
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