Re: [CAD_CAM_EDM_DRO] Re: Why gecko drives don't support DC brushless servo ? do they ?

turbulatordude wrote:

>--- In CAD_CAM_EDM_DRO@yahoogroups.com, Steve Blackmore <steve@...> wrote:
>
>
>>On Sun, 08 Oct 2006 19:40:36 -0000, you wrote:
>>
>>
>>
>>>Last week I mentioned some brushless motor airplane motors on this
>>>page.
>>>
>>>
>>Brushless airplane motors are not a really a good choice. They are
>>designed for a purpose. They are very coggy at low speeds and overheat
>>without adequate airflow. You may be able to find a good motor, by
>>chance or experiment, but you'd be better advised to buy a suitable
>>motor in the first place and save your wallet/time ;)
>>
>>Steve Blackmore
>>--
>>
>>
>
>
>There was some discussion some months ago about optimizing motors by
>offsetting the armature or brushes or some such to allow the motors to
>run better at some speed and/or direction.
>
>do you know if this is the case with these R/C type motors ?
>
>

The technique involves putting a twist in the armature laminations when they
are installed onto the motor shaft. I don't think it is possible to do
this without
completely disassembling the motor. And, this only applies to a DC brush
motor.

For the same effect on a typical brushless motor, you would probably need to
make new stator laminations, or arrange to (re)install them in the motor
housing
with a twist to them. If the motor only has 2 rotor poles, then the
stator would
need a 1/6th turn, or 60 degrees, from front to back. I think this
would play
hob with the commuation of the motor. (But, maybe it would be very smooth
and not lose too much torque.)

Jon