wolfy
Gold Supporter
Thanks mate, I am looking at sensored motors.
wolfy
wolfy
The energy in a capacitor is W*h = 0.5 C * V ^ 2Thorically supercapacitors have a 10W/hour capacity per kilo, if you need 6000W during one minute (pre-spinning time), so you would need a a 100Wh supercapacitor pack to pre-spinn one minute at 6000w,
The reaction torque of the pre-rotation rests on the ground. Consequently, if the engine is at the top of the mast, the reaction torque can only descend through the mast.My starter motor, prerotator is mounted onto the rotor head, therefore, with my setup the torque is surely between the starter motor mounting and the rotor head, completely apart from the mast ... I think.
If you get too much vibration from the velocity change in the joints you might find some small constant-velocity joints to use (https://en.wikipedia.org/wiki/Constant-velocity_joint)
Your current reduction is 12-1 like Jeff says. 108/9=12. Pretty much the same as every Wunderlich ring gear/ Bendix system out there. As far as your system, It appears to me you are using an Ampflow motor A28-400 and you've said previously you are using it at 36 volts. There are a few variations of the motor, so I'm assuming you are using the most common. At 36 volts I'd experiment with ratios between 2.5-1 and 3.5-1 . The 3.5-1 might limit max RRPM in favor of a faster spin-up time and lower demand on the motor and batteries. 2.5-1 might get a bit higher max RRPM with the trade-off of higher current demand, especially when starting up and running it at full blast. Running it as is will put a huge demand on your batteries and wiring. Be careful when you start experimenting as you have a very powerful system. The RPM's you are seeing now will not be possible with blades on.From your vantage point what do you estimate the ratio is and what would you estimate the ratio should be?