Re: [TCML] tripolar coil

[Atomic <atomicrox@xxxxxxxxx>]

Thanks, that's a pity..

On Tue, Feb 19, 2013 at 11:30 AM, Jim Lux <jimlux@xxxxxxxxxxxxx> wrote:

> On 2/19/13 3:44 AM, Atomic wrote:
>
>> Might be easier to use RC grade brushless motors/ESCs for speed control. I
>> intend to try that eventually!
>>
>>
>
> My experience with R/C motors and ESCs has been that they might not be
> suitable for this application:
> a) the motors are made for light weight and high output, but not long term
> durability.  You might do better finding a nice sealed (or at least not
> open frame) commercial unit to drive. The typical R/C motor often has very
> low impedance, to get maximum output from limited battery pack voltage.
> b) The typical ESC doesn't control the actual speed in terms of holding a
> setpoint, which is what I think you'd want for a rotary gap.  They do more
> of a "throttle" kind of function with a PWM scheme.
>
> I've used ESCs to control conventional 12 and 24VDC brushed motors with
> good results, asssuming you stay well within the current and temperature
> limits of the ESC. The R/C market has a very different duty cycle and
> cooling available than a TC.  For most R/C devices, the more throttle
> you're putting in, the faster you are going, and the more cooling air/water
> you have to deal with the IR losses in the switch device.
>
>
>
>
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