Senior Member
Joined: 27/09/2008
Location: AustraliaPosts: 190
| Posted: 12:12pm 09 Jan 2013 |
Hi Naeem,
The Fisher and Pakel motor converted to use as an alternator in many of the Back Shed projects is a brushless DC motor that uses Hall effect sensors to determine the rotor position (although it is not an axial flux type, but this does not matter).
I recall an article in the Australian Silicon Chip magazine of about a year ago that describes how to modify one of these motors for low voltage operation, including how to adapt the inbuilt Hall effect sensors to function in the new circuit.
In order to access the full details of Silicon Chip articles, I think that you will have to pay some sort of subscription, but it might be the quickest way to get hold of a workable circuit. You might also note the name of the author of this article, and see if he has any direct posts on the internet on this topic.
Other than that, keep searching the internet for information on brushless DC motors. I am sure that someone somewhere will have posted information that will help.
Regards
PS I have not ever experimented with Hall effect sensors for this function, but I imagine that you need to be careful in locating them so that their function of determining the rotor position is not compromised by the magnetic field produced by the stator windings themselves.
Don B