Quote:
Originally Posted by Jetijs
Ok, I understand now.
I did not load the motor more because my wheel is made of plexiglass and if I load it more, the plexiglass starts to melt. But still, the efficiency of my motor should be way better. I don't understand this.  |
Jetijs,
Don't worry. Your motor IS more efficient than this. You just haven't fine tuned it yet. Attraction motors produce torque by "attraction". But unless the attraction cycle is turned off at the right time, they can "attract back" and destroy some of their forward progress. Your motor topology has one of the best stator arrangements we have ever simulated. But the stator must be completely "de-magnetized" by the time of direct alignment of the rotor or the rotor will produce "negative torque" as it tries to leave the stator. Your tests were done with a 65 degree "ON" time of the opto-commutator. This only leaves 25 degrees of rotation for the fields to collapse and begin being re-established at the other stator poles. This is NOT an optimum timing set up!
Please stop "agonizing" over this early test data. When you are able, you can start a systematic study of the effects of changing the timing on your motor. There IS a place where the speed is highest and the current draw is lowest..... just like an SSG. You will find very good efficiency numbers there. Also, for high speed operation, you WILL need to ADVANCE the timing, just like in your automobile engine!
Peter