PAS Levels, torque vs speed?

[AHicks]

Sierratim, off topic a bit, but note what happens on that graph in your link when you change from a 25a controller to a 35a controller - no other changes.

I was wondering why the big change from the chart I ran above with a MAC 12t to the one you ran with the GMAC 10t. The MAC and GMAC use the same components internally, other than the internal clutch and 2 turns of wire on each pole of the armature. I would have imagined VERY similar starting torque available GMAC vs. MAC. Took a second to figure it out, but clearly they like a lot of amperage on tap when starting out. The extra 10 amps makes quite a difference.... -Al

 

[Sierratim]

Sierratim, off topic a bit, but note what happens on that graph in your link when you change from a 25a controller to a 35a controller - no other changes.

I was wondering why the big change from the chart I ran above with a MAC 12t to the one you ran with the GMAC 10t. The MAC and GMAC use the same components internally, other than the internal clutch and 2 turns of wire on each pole of the armature. I would have imagined VERY similar starting torque available GMAC vs. MAC. Took a second to figure it out, but clearly they like a lot of amperage on tap when starting out. The extra 10 amps makes quite a difference.... -Al

Yep, the controller is a big consideration! I went with your MAC motor setup for discussion purposes, but can't really explain differences between Grin's modeling and bench testing of the MAC vs GMAC motors.

 

[Sierratim]

Sierratim, off topic a bit, but note what happens on that graph in your link when you change from a 25a controller to a 35a controller - no other changes.

I was wondering why the big change from the chart I ran above with a MAC 12t to the one you ran with the GMAC 10t. The MAC and GMAC use the same components internally, other than the internal clutch and 2 turns of wire on each pole of the armature. I would have imagined VERY similar starting torque available GMAC vs. MAC. Took a second to figure it out, but clearly they like a lot of amperage on tap when starting out. The extra 10 amps makes quite a difference.... -Al

I found an error in my setup of the motor simulator for the GMAC motor in post#11 above. I had not selected 'hub drive' for the motor. I've corrected this. The curves between the MAC vs GMAC are more like one would expect now.