Jeremy Harris wrote:You're right, fitting the Halls internally means no timing adjustment, but in practice all the motors I've done this too have worked very well indeed like this, better than the one motor that I tried external Halls on.
if you mount the sensors internally, you have the choice of mounting the sensors in 4 different slots, 2 of those options will give neutral timing (it will run the same rpm forwards or backwards) and the other 2 options will give you either 30deg advanced or retarded timing.
if you know the winding pattern of the motor, you want the sensors in the slot between two phases (eg beteween ab, ca and bc).
if you dont know the winding pattern you can run the motor with the halls not permanently installed and see how the motor runs both forward and backwards.
if it runs the same rpm(and no-load current) both ways you have neutral timing (with the correct phase and sensor combination ofcourse). if this is not the case, move the sensors over one slot (doenst matter which way) you will have neutral timing