Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post

twotires · 09-15-2011, 10:56 AM

Hi all, need some advice.
I completed my controller assembly (500A, 144V version) and am trying to test it. I've got it hooked up on my workbench using (8) AA alkaline batteries to power the board, and a 12V lead-acid lawn mower battery as the traction pack. The motor is a blender motor which pulls 0.8 A running full speed (hooked directly to this traction pack.)

So, nothing happens.

Is this traction pack / motor combo too small to test the controller? I would have expected to push the throttle just a little, and the controller just ramping up very quickly to full speed - trying to force the amps up past 0.8 .... maybe the LEM HASS can't read amps that small?

The motor doesn't even begin to turn.
I can see the PWM signal with my oscilloscope, sort of, and it looks like it quickly goes to full throttle after beginning to turn the throttle just a few degrees off zero.

So, why doesn't the motor spin?
Thanks!

09-15-2011, 10:56 AM	#1 (permalink)
twotires EcoModding Noob Join Date: Dec 2010 Location: Raleigh, NC, USA Posts: 24 Thanks: 9 Thanked 4 Times in 3 Posts	First Controller Test Hi all, need some advice. I completed my controller assembly (500A, 144V version) and am trying to test it. I've got it hooked up on my workbench using (8) AA alkaline batteries to power the board, and a 12V lead-acid lawn mower battery as the traction pack. The motor is a blender motor which pulls 0.8 A running full speed (hooked directly to this traction pack.) So, nothing happens. Is this traction pack / motor combo too small to test the controller? I would have expected to push the throttle just a little, and the controller just ramping up very quickly to full speed - trying to force the amps up past 0.8 .... maybe the LEM HASS can't read amps that small? The motor doesn't even begin to turn. I can see the PWM signal with my oscilloscope, sort of, and it looks like it quickly goes to full throttle after beginning to turn the throttle just a few degrees off zero. So, why doesn't the motor spin? Thanks!