Controller circuit for Hilden Brandt motor needed..

[Elisha]

Hi Steven

Very good video, very professional, Your findings are near with Jack findings, well.   But before you make test with high voltage, please make test with osciloscope in the coil of the motor, channel one to coil one, channel two in coil two, please now repeat the test with load and without load and with magnet and without the magnets.   In this way we can tune up the voltage for the coil and the pulse width.

If dont have any oscilloscope, please let know to the forum, someone could help you.

Steve if you can make the controller for your motor, you could do the controller for Jack? If yes, please indicate the budget needed.

[Nali2001]

Hi Steven,

Well, Great job, Carl said it all, so I'll not run on.

I am confused about your lack of increased torque. Your magnetic switching unit is closer to the Sumo motor, you can see the performance charts here if you haven't before:

http://www.genesis-corp.co.jp/e/e401.html

There main motor is a hub motor (example at bottom of page), so the stator and rotor are inverted. But they have four magnetic switching units instead of two. That maybe where you are losing some of the torque.

Regards, Larry

Hi Larry and thanks,
Yes the lack of torque increase is puzzling to me as well. Can't really give you a good reason why right now.
Never seen that Sumo Motor before, interesting thanks!
Well indeed the more (overlapping) poles you have the better/more equal the power distribution is

[Nali2001]

Hi Steven,

in the video you wrote, "....and so lower the amp draw just like in normal electric motor"  i think this is not true.  normally when you load a motor, the amps go up, like yours did when you applied the load.

the neat thing about your motor, when you add the magnets, amps go down to about half while still carrying the same load.  granted the rpm went down to 748.8rpm (the last frame showed the tach reading at 752.2rpm, so pretty much the same rpm as before magnets, 750.8-754.3rpm), but you didn't lose 50% of rpm.

this says to me you were doing the same work for half the power.  REALLY NEAT!!!

i would say next thing to do is find out how much work that really is.

keep up the GREAT work!!

tom

Hi Tom and thinks,
Hmm yes what I was mean is the fact that a normal (for example dc) motor has a big amp start up surge of say 10 amp. But when the thing is idling at speed, say 1200 rpm unloaded, it is only pulling say 1 amp, why?. That is because of the back emf. Adding the magnetic field of the magnets to the motor valves might cause something like that in the motor in the video.

"i would say next thing to do is find out how much work that really is."
That would be an important step indeed... hmm gotta think about that.

[Nali2001]

Hi Steven

Very good video, very professional, Your findings are near with Jack findings, well.   But before you make test with high voltage, please make test with osciloscope in the coil of the motor, channel one to coil one, channel two in coil two, please now repeat the test with load and without load and with magnet and without the magnets.   In this way we can tune up the voltage for the coil and the pulse width.

If dont have any oscilloscope, please let know to the forum, someone could help you.

Steve if you can make the controller for your motor, you could do the controller for Jack? If yes, please indicate the budget needed.

Hi Elisha  and thanks,
I have a scope, will see what I can do. although my simple scope has some trouble centering the frequency.
Well the thing is I perhaps could. But man... his 150dc is damn scary. I blasted away a copper circuit path at 24v already with this motor.

[Nali2001]

Well talking about the controller made me write this comment. Honk maybe you can use this.

One of the issues with this type of motor is the need for fast switching low impedance coils. That means low coil resistance. And since there are no magnets (or magnetic fields) in the rotor you also don't have the normal back emf (for the record, I'm talking about the real meaning of back emf and not the mis phrased High voltage spike) a normal motor has. That causes a MASSIVE amp surge at start up. Much more then a normal motor. My system will at 48 volt idle at like 0.8 amp. BUT at startup it is smashing my 10 amp scale maximum over and out for like a second or more. I have wasted like two irf250 fets that way. And in Jacks system there is also the problem it seems of the very intense inductive collapse. In my version it is not that crazy. I capture around 180volts to the cap and bulb. But the big amp draw is a problem. Precautions must be taken like starting up at low voltage and climb up to what you need. Or somehow current limit the input system (Jacks dc supply is likely current limited/low amp rated) Or use a system that chops a single pulse in a train of smaller parts.

Regards,
Steven