Hey guys,
I recently finished my ebike. It's a Giant Revive with 20" wheels, a 16S LiFePo battery (51V) and a Puma (with 225RPM/36V).
This setup is a bit too fast for me, I want the freewheeling RPMs of the motor to max out <25km/h. Right now, the freewheeling speed goes up to 34km/h. A Motor with 175RPM/36V would be ideal for me. This version is listed at my vendor:
http://www.ebike-solutions.com/de/shop/motoren/motoren-bis-250w/puma-vorderradmotor-250w.html
Having wound RC motors myself in the past, I thought it would be a nice challenge to do this, and just change a newly wound stator against the old one, instead of changing the motor. Here is a tutorial in a german forum:
https://www.pedelecforum.de/forum/index.php?threads/puma-mac-motor-neuwickeln-tutorial.28738/
What I am looking for now is verified information, which tells me which freewheeling RPM I can expect with a specific winding number at a specific voltage. Wherever I look, and there are not many places, I find conflicting information.
The guy from the forum link above had 11 windings, and from the information he gave me personally achieved around ~260RPM/36V.
This conflicts with the information I find here:
https://web.archive.org/web/20160406145800/http://em3ev.com/store/index.php?route=product/product&path=40&product_id=52
Turns; RPM/36V loaded
12; 200
10; 255
8; 320
6; 410
According to this table, 11 turns should get me around 230 RPM.
I found an image of my motor, and I count something between 15 and 17 windings (maybe double windings?).
This again does not correspond with the two pieces of information mentioned before.
So, what is it now? How can I know without trying different winding numbers how many windings I need to get 175RPM/36V?
I want to use the attached winding scheme with Y termination.
Thanks a lot.
Regards,
Julian
I recently finished my ebike. It's a Giant Revive with 20" wheels, a 16S LiFePo battery (51V) and a Puma (with 225RPM/36V).
This setup is a bit too fast for me, I want the freewheeling RPMs of the motor to max out <25km/h. Right now, the freewheeling speed goes up to 34km/h. A Motor with 175RPM/36V would be ideal for me. This version is listed at my vendor:
http://www.ebike-solutions.com/de/shop/motoren/motoren-bis-250w/puma-vorderradmotor-250w.html
Having wound RC motors myself in the past, I thought it would be a nice challenge to do this, and just change a newly wound stator against the old one, instead of changing the motor. Here is a tutorial in a german forum:
https://www.pedelecforum.de/forum/index.php?threads/puma-mac-motor-neuwickeln-tutorial.28738/
What I am looking for now is verified information, which tells me which freewheeling RPM I can expect with a specific winding number at a specific voltage. Wherever I look, and there are not many places, I find conflicting information.
The guy from the forum link above had 11 windings, and from the information he gave me personally achieved around ~260RPM/36V.
This conflicts with the information I find here:
https://web.archive.org/web/20160406145800/http://em3ev.com/store/index.php?route=product/product&path=40&product_id=52
Turns; RPM/36V loaded
12; 200
10; 255
8; 320
6; 410
According to this table, 11 turns should get me around 230 RPM.
I found an image of my motor, and I count something between 15 and 17 windings (maybe double windings?).
This again does not correspond with the two pieces of information mentioned before.
So, what is it now? How can I know without trying different winding numbers how many windings I need to get 175RPM/36V?
I want to use the attached winding scheme with Y termination.
Thanks a lot.
Regards,
Julian