Blechi Posted September 8, 2015 Share Posted September 8, 2015 I want to integrate an Eagle Tree Systems eLogger and some sensors into my Gotway MSuper (medium).Does anyone know how many magnets are attached to the rotor ?I don't want to tear the thing that far apart.Thanks in advance. Blechi Link to comment Share on other sites More sharing options...
Jason McNeil Posted September 8, 2015 Share Posted September 8, 2015 There's three options to monitoring RPM with EagleTree logger: magnetic, optical & sensors over the motor input wires. The first two didn't work for me, perhaps faulty a faulty magneto sensor, while the optical was too erratic. If you contact GW, they might have an answer to the number of poles... Link to comment Share on other sites More sharing options...
Blechi Posted September 8, 2015 Author Share Posted September 8, 2015 Thanks for the reply.Yes, i'm aiming at the motor wires.Is there a way to contact GW outside of facebook (which i happen to boycott) ? Link to comment Share on other sites More sharing options...
Tilmann Posted September 8, 2015 Share Posted September 8, 2015 Is there a way to contact GW outside of facebook (which i happen to boycott) ?GotWay <jane.ebicycle@gmail.com>Jane Mo Link to comment Share on other sites More sharing options...
Blechi Posted September 8, 2015 Author Share Posted September 8, 2015 Thanks, i'll give it a try. Link to comment Share on other sites More sharing options...
Blechi Posted September 10, 2015 Author Share Posted September 10, 2015 OK, i got a reply from Jane.The Gotway MSuper 18 has 28 poles. Link to comment Share on other sites More sharing options...
Gimlet Posted September 10, 2015 Share Posted September 10, 2015 Probably got it wrong but I thought the number was always a multiple of 3 to match the 3 coil phases? Link to comment Share on other sites More sharing options...
Blechi Posted September 10, 2015 Author Share Posted September 10, 2015 Probably got it wrong but I thought the number was always a multiple of 3 to match the 3 coil phases?AFAIK this is done to reduce torque ripple.If the number of poles matches (or is a multiple of) the number of coils the magnets line up and tend to 'stick' to the iron core of the coils all around the motor at the same time. More power is needed to 'unstick' them and pull them to the next position.If the number of poles doesn't match (or is a multiple of) the number of coils only a part of the magnets lines up with the iron core of the coils at any given time and it's easier to pull the next pair to line up with another pair of coils. Link to comment Share on other sites More sharing options...
marlenewiley Posted February 25, 2016 Share Posted February 25, 2016 If you take a piece of suitable material like ‘mild’ steel, put it inside a coil of wire and drive a strong electrical current through the coil, then that converts the steel into a permanent magnet. Link to comment Share on other sites More sharing options...
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