Re: [EVGRAY] Sweet spot

Body

JamesThe "Golden motor" is a Chinese made bicycle hub motor, Found in a yacht club bulk hopper, and given to me without the controller as there was none, by a fellow sailor, very interested in my experiments.Looking them up on Google, there is lots of material about them, and they seem popular.It is three phase and very much in the same camp as the Samsung which is waiting for me in Toronto.
Cheers Warren
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  On Thu, 7 Mar 2019 at 12:43 PM, James Glinski [email protected] [EVGRAY]<[email protected]> wrote:       
Warren is the term Golden motor a term that just you use or is it that name in general ? Oh thinks for the 150 watt motor tip . 

On Thursday, March 7, 2019, Mick [email protected] [EVGRAY] <[email protected]> wrote:


     
 

Warren,
 
You may want to limit the voltage going to the variac with some GDT's and use the excess the charge caps as the spikes from the magneto effect can cause enough voltage to punch through the varnish on your variac autoformer.
 These devices are not designed for voltages above the dielectric breakdown which can be a couple thousand volts, not at all hard to reach specially if switching the little motor through fast speed changes or switching the output by shorting the coils.  Current capacity may have little to do with it as it does not sound as if you had a load beyond the ability of the first autoformer.
 
 On 3/6/2019 6:30 PM, Warren Keillor [email protected] [EVGRAY] wrote:
  
    
Doug
 I hope you can see the simple apparatus and arrangement I put together to try to find that sweet spot on the rpm range on my other email. The rpm was quite high compared to any bicycle wheel speeds, one could ever reach. I may well of travelled through the correct speed ande not known it since I was just doing a machinery check out. In storage, snow had gotten into the golden motor and it was seized up, so I had to take it apart, clean it, lube it, and put it back together. I thought I better check it out today doing a full speed run using a little load, a 40 watt incandescent  light bulb, and see how fast it could go.
 The range is good but needs a bigger variac, like my 30 amp, that I never consider load with, until I have to carry it across the barn yard in the snow. I have learned my lesson not to be lazy. Cheers Warren
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