Re: Driver for very small brushless DC motors?

ns

ue

This reminds me of a toy I used to love. It was a gyroscope, with a wrap-string-on-shaft motor. Do you have to have electric drive?

- Michael Wieser

spins

due

much.

bearings.

it's

=20

Hey, i still vote for the flywheel.

(or a

used to

self-servowriting

for

timing, and

=A0He

with

measurements).

Sunday

Not the lowest friction bearing but certainly smooth during useful life.

Reminds me of disk motors, as used in early electricity meters ?. All you need then are two or three coils around the circumference. So long as you can electronically isolate the windings on spin down, there should be negligable effect on spin down. A metal disk is easy to balance as well...

Computer dat drives use a what looks like a modded camcorder mechanism, with flat rare earth magnetics on the shaft and ironless pancake coils to drive them, should you need much torque. Usually a one chip drive solution internally, though from the examples i've stripped down, often hall sensor(s) as well...

Regards,

Chris