[kennybobby]

The motor has 3 phases and there are 3 hall sensors attached internally with the windings to measure magnet position as the shaft rotates and used for motor commutation. Unless there was an error at the factory it should not be necessary to mess with the hall sensors to get the motor to spin--that timing is set and fixed with epoxy.

An encoder could be added to either the motor or the drivetrain shaft to measure shaft angular position, to sense rotational direction, and to calculate shaft speed.

It's not clear where your encoder is mounted, and i'm not familiar with your controller, but it sounds like you solved the problem with a little bit of trial and error, and didn't let out the magic smoke...

 

[kennybobby]

How to reverse direction with Hall Sensor Commutation

For motors with 120 electrical degree Hall sensor spacing, if the physical wiring between a 3-phase motor and the drive controller with Hall commutation feedback needs to change, in order to achieve a specific motor direction for a given input command, then you only need to

(1) Flip the two outside motor phase connections (phase: A and C or U and W) at the controller.

(2) Switch the top two associated Hall connections (Ha and Hb, Hu and Hv, or S1 and S2) at the controller.


For a motor with 60 degree Hall spacing, then it can be converted to 120 degree spacing by inverting the polarity of the output voltage of the S3 or W sensor (U-V-W inverted).


This convention uses a positive hall voltage to correspond to a positive back emf voltage in the phase winding, for the desired direction of rotation.

Another NEMA motor convention defines motor windings as "U-V-W" for positive direction in clockwise direction viewed from the shaft end. Motors using "A-B-C" windings have positive for CW viewed from the hall sensor wire exit (opposite) end.

Looking at the ME0913 drawing, it is labelled as U-V-W but using CCW as the positive direction--so it is not following the NEMA convention. Your controller was likely made for an U-V-W motor and the Motenergy motor is wound as an "A-B-C", and this was the root of the problem.


Just a little fyi, the use of the word "encoder" (even in the title) was really confusing and a distraction of the actual issue at hand, i.e. the phasing of the hall sensors.