19 Jun
2013
19 Jun
'13
8:32 p.m.
On 6/19/2013 3:39 PM, Tony Duell wrote:
yep
The spindle
motor rotates easily, but when I apply power, it tries to
turn on, moves just a bit (like the magnetic field is pulling to some
state) and then stops. A bit later, something turns something off
(there is a slight click), and that's all there is.
Do you mean that the motor
turns through a very small angle (<< 1
revolutuion)?
If so, this soulds like a program with the motor controller circuitry.
These motors are electornically commuatated using power transsitors on
the logic bvoard.
After I wrote the email, I took a better look at the board and I
see the
transistors.
I think I'd start by checkign those power
transisotrs. If that doesn't
help, look at the signals on the pins of U10
I'll check the transistors first.
It should be fairly easy to check the widnig nfor
continuity and to look
at the hall sensor output while turnig nthe motor by hand with power applied.
I
think the winding is intact, as it will move with power applied. I
would think it would do nothing with a break in the winding. hall
sensor is easy to test as well.
JIm
-tony
--
Jim Brain
brain at jbrain.com
www.jbrain.com