Re: [CAD_CAM_EDM_DRO] Re: Testing servos

bitnick78 wrote:

>What would be the easiest way to test an AC PM servo motor without a
>servo drive? The encoder is easy I guess, just hook it up and turn
>the motor to see that it gives out the signals it should, but how do
>I test the status of the windings/magnets?
>
>

You can connect a D cell between any 2 of the 3 motor wires, the motor
should jump about 1/3 of a turn each time as you go around the sequence
(assuming a 2-pole motor). If you wqant to do more detailed tests, I
suppose you could spin it with a motor and make sure each winding
puts out the same voltage. If you can spin it at 1000 RPM and it doesn't
get hot, it is almost certainly OK. If a winding was burned up, it would
most likely get hot quickly when spun by a motor.

Also, the motor generally will have 3 hall-effect sensors or encoder
channels that control commutation of the motor.

Jon