775 pro likely to pop breakers?

[frcguy]

For our intake we are using a MiniCIM geared at 4:1 on a VersaPlanatary. Like others have said, the 775pro is an air cooled motor, so it needs ample room for heat dissipation and air intake.

[MaGiC_PiKaChU]

We used 8 775Pros on our drive train, 1 on the intake, and 2 on our scaling mechanism. The only time we popped a breaker was when we had only 1 on the scaler.

[FrankJ]

Keep in mind the even the CIMs have a pretty short duty cycle even when running at rated speed. Run any of the FRC motors at full voltage and stall and you will rapidly overheat and smoke them. The CIMs and their smaller relatives do better because of their greater thermal mass & reliance on conduction rather than convection for heat transfer. The motors with stall currents > 40amp will eventually cause the breaker to chatter or the speed controller to pull back the voltage to the motor (Assuming the speed controller has that function built in).

So if you are using any brushed dc motor for positioning you should keep this in mind. If it takes more than 20%-40% percent of the full voltage stall current to hold the position, you are going to rapidly overheat the motor. For motors than use fan cooling consider ducting one of the KOP fans to help with cooling

[Joe Johnson]

Originally Posted by MaGiC_PiKaChU

We used 8 775Pros on our drive train, <snip>

Say on sir. Had this motor been out earlier in the fall and had weight been an issue, I would have pushed very hard for a (8) 775Pros over (4) CIMs but without time to really suss this out, I was just too scared to advocate.

What are your ratio(s) (motor to wheel please), tires (size and grippiness), chassis configuration (# of wheels, any lowered if so how much, distances between wheels side to side and fore/aft)...

In general, open wide your kimono Mr. PiKaChU, open wide...

Dr. Joe J.

[orangemoore]

Originally Posted by Joe Johnson

Say on sir. Had this motor been out earlier in the fall and had weight been an issue, I would have pushed very hard for a (8) 775Pros over (4) CIMs but without time to really suss this out, I was just too scared to advocate.

What are your ratio(s) (motor to wheel please), tires (size and grippiness), chassis configuration (# of wheels, any lowered if so how much, distances between wheels side to side and fore/aft)...

In general, open wide your kimono Mr. PiKaChU, open wide...

Dr. Joe J.

Their reveal thread should begin to answer your questions.

http://www.chiefdelphi.com/forums/sh...highlight=3360