Hall sensor positioning and spacing

[Brushlessboy16]

Hey guys, Im Looking to set up my Turnigy 80-85 170kv outrunner motor with Honeywell ss41 Sensors. My Controller can be set up for 60 degree or 120 Degree Hall sensor positioning.

What is the difference between the two? My understanding is that 60 degree would give me a bit smoother start up due to the sensors being closer together, you would have more sensor pulses per rotation. but then the problem arises that if the controller ha a limit to the number of sensor pulses then you effectively have an rpm limit...

what are the pros and cons to each and is one definitively better than the other?

 

[gwhy!]

Hey guys, Im Looking to set up my Turnigy 80-85 170kv outrunner motor with Honeywell ss41 Sensors. My Controller can be set up for 60 degree or 120 Degree Hall sensor positioning.

What is the difference between the two? My understanding is that 60 degree would give me a bit smoother start up due to the sensors being closer together, you would have more sensor pulses per rotation. but then the problem arises that if the controller ha a limit to the number of sensor pulses then you effectively have an rpm limit...

what are the pros and cons to each and is one definitively better than the other?

Hi Brushless,
I dont think there is any performace differences between the 2 postions. The pro and cons are: 120 is straight forward evenly spaced around the motor ( or internal in the stator slots , requires taking the motor apart) but requires longer connecting wires between the halls. 60 shorter connecting wires but would be near impossible to mount internally. 17.1 degrees spacing ( fooled 120degree spacing ) gives you the smallest footprint but will also have to be mounted on the outside of the motor.

 

[Brushlessboy16]

Thanks for the response Gwhy!. Ill probably make some external mounting block with the 3 sensors mounted at 17.1* and have it adjustable Does anyone know what timing advance these controllers are made to run on?

The only thing I dont like about the 120* spacing is that its non adjustable, and 60* is just a large amount of unnecessary wire(weight)


Does the spacing of the Sensors effect anything like timing advance/retarding?