Sun/Carrier R/S Ring/Carrier Ring Reduction Pulleys ots
rsc rrc rr
3:1 2 1.5 : 1 2:1 60:30
4:1 3 1.33 : 1 3:1 60:20
5:1 4 1.2 : 1 4.17:1 72:17
I'll post them here, too:12p3phPMDC wrote: Miles also gives you the criteria in
his RD two speed planetary thread.
Why don't you download the trial version of Alibre? You can continue to use it (with a limited number of parts) after the trial ends. Another alternative is the free version of One-Space-Modeller: http://www.ptc.com/offers/tryout/pe2.htm As you say, Sketch-Up is far from ideal, for this kind of thing.....amberwolf wrote:Will make sketches as soon as I can get back to Lightwave3D (gurgle scatsup sucks for this, at least for me).
This is an overview of the control logic of the Nohassel propulsion unitÂ´s two motors
The functionality of the two motors is controlled electronically. The basic function is quite logical and can be described as this control loop:
A) set the most powerful motor (LRK) to a speed that is within range of epicyclic gearing for the wheel RPM and optimized for LRK efficiency
B) set the speed of the smaller motor (HS) to a speed that matches LRK and wheel RPM (taken from a premade table in the master controllers program memory)
C) check if wheel speed is correct (based on sensor input from pedelec, brakes, throttle, current sensors, temperature sensors)
D) adjust target speed if needed based on input from C) and goto A)
Miles wrote:Why don't you download the trial version of Alibre? You can continue to use it (with a limited number of parts) after the trial ends. Another alternative is the free version of One-Space-Modeller: http://www.ptc.com/offers/tryout/pe2.htm
12p3phPMDC wrote:What kind of motor would you nest inside the F&P motor? another smaller outrunner?
The complexities of reverse and the super high torque modes with the ring gear and sun gear spinning in opposite directions makes me squirm a bit.
I think that you bring up some good points in regards to "idle" modes and current draw. I think that you can avoid huge stall currents at low rpm by playing some tricks with the controllers. You would need a dead band possibly around low rpms where you would benefit from reversing one motor and having the other in a forward direction to give you "crawl" gear. Then as you speed up, the other motor would need to quickly change directions and go to a fast enough forward direction to avoid the dead band zone.
That's why I want to put some one ways in....to isolate the inputs, and to add redundant operation.
In a hybrid app, you could run the ring gear off a honda mini 4 stroke input and run the sun gear off the BLDC.
Then you have redundant operation via freewheels or oneways. Then you could have a tri-brid, Human Power, Electric, and Gas.
The one-ways mess with your ability to regen, but oh, well. you can't have it all unless you work at Toyota or Ford R&D
with the hybrid synergy drives.
Sorry..... It's all in the FAQ: http://groups.google.com/group/nohassel ... -questions12p3phPMDC wrote:What happened to the rest of your post Miles....?
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