Sharing ideas on how to make a more efficent motor using Flyback (MODERATED)

[gotoluc]

If you can get four of these HEF4047B cheap chips (CD4047) then I could draw you a schematic that will allow you to trigger on the edge of that white tape and have an adjustable ON pulse width (independent of the tape width) as well as a signal for emptying that capacitor later.

All I would need to know is whether that pulse from your opto is positive going or negative going....

I have some MC14013b, LM3915, IR2103  on hand, any good?

The opto is a positive pulse.

Thanks

Luc

[seychelles]

The answer to you answer is below.

[seychelles]

An increased in magnetic field = increase in torque and BEMF..

[gotoluc]

Hi everyone,

I think the limitation we have is no one really knows for sure the exact behavior of a non CEMF motor. What we have heard most often is, the current shouldn't change no matter the load. However, mine does change a little, so does this mean it's not a non CEMF motor?
This was bothering me so I decided to take an off the shelf DC motor and observe its behavior when set to as close to the same conditions as my v.2 bucking motor.
Well, to my surprise I can't see much of a difference once everything is setup to the same.

You be the judge: https://www.youtube.com/watch?v=SozrH_IyPXc

Let me know if you think I'm missing something

Thanks

Luc

[verpies]

Okay, then how about you share on the results you saw in my last video demo before it broke apart. Do you think this design idea has any value?... what changes would you make if it needs any?  etc.

The build is fine, except for the rotor design.
The electric current profile and its covariance with the supply voltage is nothing unusual and it is accordance with this analysis but it  has potential to be interesting because the operating principle is different than a common DC motor.

My changes to the mechanical design:
- I would embed the I-cores in a solid wheel by routing out sockets for them (stronger and less windage),

My changes to the electronic design:
- Fully electronic adjustment of the driving pulse position instead of the mechanic adjustment
- Fully electronic adjustment of the driving pulse width
- Deleting that inductive load resistor across the capacitor and substituting it with a reed relay in series with an automotive light bulb for emptying the capacitor (could be a different resistor but the bulb is more fun)
- Judging how much energy is recovered from the motor winding by measuring the peak voltage to which the capacitor gets charged, as this is very precise and dependable method if the capacitor is good, meaning: it does not leak or soak.
- not sharing the same power supply between the motor winding and the electronics...or at least a separate voltage regulator.
- Using a real MOSFET gate driver.
...and much more refinements later (such as closing flux paths).