4 ph stepper motor 2

[adavidi]

I need to check stepper motor (4 phase) for:
1. Shaft moment with or without load.
2. Wire connection.
3. Rotation direction.
4. Bearings.
Does anyone know about test device in the market that can check these parameters?
Thanks in advance.
Aharon

 

[jbartos]

Suggestions marked ///\\I need to check stepper motor (4 phase) for:
1. Shaft moment with or without load.
///Dynamometer might be used.\\2. Wire connection.
///There may or may not be one. A visual inspection is usually performed.\\3. Rotation direction.
///Phase sequence meter might potentially be applied.\\4. Bearings.
///Bearings can be tested for vibration, temperature, etc.\\Does anyone know about test device in the market that can check these parameters?
///There appears to be a need for more than one test device.\\Thanks in advance.
Aharon

 

[adavidi]

Jbartos,
Thanks.

 

[AeroPD805]

Ada,
The best place to start is with the manufacture of the
motor. Typically they can provide hook-up info and
the winding resistance of each phase.
If this info is not available check that the pahses
have equal resistance.
re: rotation; direction is determined by how the phases
are hooked up to the driver.

re: torque; this would be hard to do on a dyno without
heating up the motor.
I use to check magnet integrity [which generates the
torque] by attaching a torque watch to the shaft and
energizing all the phases. Typically there's a current value on the label - apply voltage up to that current level. Note: This all must be done quickly.
The shaft will lock on a step - evenly apply torque to
the watch and read the torque before the shaft clicks to the next step.
Sometime they have this torque value on the label.

re: bearings; remove the end covers and spin the bearings
- if the bearing spin freely, without noise, the bearings
are probably O-K. Whatever you do - do not remove the
rotor!
Hope this helps...
P.

 

[adavidi]

AeroPD,
Thanks.