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Re: Rotor & sync motor
From: Jean-Marc Patten[SMTP:jp001-at-mail.orion-dot-org]
Sent: Tuesday, September 16, 1997 11:59 AM
To: Tesla List
Cc: 'Tesla List'
Subject: Re: Rotor & sync motor
Iam not sure but arn't the VERY OLD mainfram disk drives sync.? IF so i
have one i will get more info if you are interested?
On Tue, 16 Sep 1997, Tesla List wrote:
>
> From: gweaver[SMTP:gweaver-at-earthlink-dot-net]
> Sent: Monday, September 15, 1997 11:50 PM
> To: Tesla-at-pupman-dot-com
> Subject: Rotor & sync motor
>
> I have been thinking about building a rotor for my 10" TC. After reading
> all the post for the last 4 months about rotors I have come up with this idea.
>
> One post mentions that most people build a rotor with 2 series gaps. But a
> rotor with 4 series gaps would be much better.
>
> Another post mentions 2 gaps are all that are needed and 4 are more than
> enough for a rotor. More than 4 are wasted.
>
> Several posts mention that the rotor should have no more than 400 bps and
> less is better. Nothing is gained by having more bps.
>
> Several posts mention dwell time as being very important. Fewer bps gives
> longer dwell time. And small electrods are better than wide ones.
>
> I think I will build a rotor that will fire one time for every 60 Hz AC
> peak. I don't see any reason to make it fire more than once for each peak.
>
> 2 rotating electrodes on a 9" disk and 2 stationary electrodes using an 1800
> RPM sync motor will give 120 Hz. It will fire on each + and - AC peak.
>
> 2 additional stationary electrodes opposite the other 2 stationary
> electrodes will give me 4 gaps with them wired in series.
>
> How does this look so far? Does anyone have any suggestions.
>
>
> I called my friend at the motor shop about a sync motor. He said they don't
> make sync motors any more with out special order and they are very
> expensive. True sync motors have a wound armature with slip rings and
> brushes. No used sync motors are available.
>
> Some information on the internet says 4 flats can be milled in the armature
> to make a 1750 RPM run sync. Most AC motors are 1725 RPM. My question is,
> will this work on a 1725 RPM motor? My next question is, will the flats make
> a 1725 RPM motor run at 1800 RPM?
>
> My friend at the motor shop said he thought the flats would make a 1725 RPM
> motor sync at exactly 1725 RPM's. And a 1750 RPM motor would sync at 1750
> RPM. But it seems to me like the flats will have to sync with the 60 Hz AC
> and run exactly 1800 RPM's. Has anyone tried this? Does this really work?
>
> I have a 1/4 HP 1725 RPM 120 VAC motor I can use to make a sync motor. If
> this really works I will mill flats in the armature and use the motor on a
> rotor.
>
> Gary Weaver
>
>
>
>