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| vtsteam:
Steve also for a controller for the ESC (ie throttle), you can use what's called an R/C "servo tester" -- they are very cheap from some sources. They generate the pwm signal the ESC needs to set the motor RPM. That motor listed by the way, has probably only limited availability. Looks like greatshark has sold out of that brand for most of the other motors in the line. Though they say " by special order" for availability on the others, I doubt it. I've used those same red motors branded as "EMP" and have had good luck with them. |
| S. Heslop:
When it says outrunner does that mean the outer casing of the motor is the part that spins? |
| mattinker:
The outer case is fixed to the spindle so that they both turn at the same time. From what I can gather they have more torque than the in-runner configuration. Regards, Matthew |
| vtsteam:
An outrunner has an outer ring that contains the magnets, and spins and is usually connected to the prop shaft. The coils and armature are stationary. Efficiencies can be up as high as the 90+% range. Higher than inrunners. Cooling is usually easier also. One consideration would be to support the shaft outside of the motor (add a pillow block) in a geared, or chain drive for a bicycle configuration. An airplane loads the motor axially in thrust. Gearing will load it radially, But it's not hard to add an external bearing. If needed also, the motor shaft can be replaced with a longer one fairly easily. Typically in a mill adaptation, an ER collet arbor is substituted for the original motor shaft. I think Reynard's forum thread on his CNC mill conversion goes into this. Here are examples of servo testers that would provide the throttle potentiometer and control circuit for the ESC. (ESC stands for Electronic Speed Controller): http://www.ebay.co.uk/sch/i.html?_nkw=servo+tester |
| S. Heslop:
Thanks again. I'll order that motor and a controller tomorrow most likely. Still gotta think about it for a bit for £90. All this motor stuff is really making me feel like a dunce though. Hopefully I don't cock it up! |
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