2016 Bosch motor 6004 RA3 194-06

[RichQuinn]

We received our first two samples of this motor last night and they looked very promising for light loads. I had a whole bunch of questions for you but then I realized most are answered here:

http://files.andymark.com/FRC_Bosch_...ec_sheetv1.pdf

One question remaining after reading the specs: Is it possible the output power curve is on an incorrectly labelled axis?

Example:
If you look at the peak power point at 11 N.m, the Input power should be 13V x 6A = 78 Watts.
The output power curve shows ~14W, and doublechecking torque & RPM confirms it at 13.8Watts

I don't expect high mechanical efficiency from a worm drive, but ~18% seems way off. Can you check and/or clarify? (Or correct me if I missed a unit conversion or decimal place.)

Regardless, it looks like a nice, light gearmotor option and the hall effect sensor makes it extra useful over a window motor. The challenge as you point out-- will be the relatively fragile output drive material, so that's a problem for us to solve. Square drive looks like an obvious solution, but more contact area would be better. Can you point us to a specific vehicle usage? We might be able to scrounge junkyard parts for the proper mating 8-point shaft. If the junction has survived automotive durability testing, it has a good shot at surviving FRC duty (if properly applied).

[Nebster]

Are there any COTS 8 point shafts available? If not, what would you suggest we use? We don't have the machining capabilities to make one out of metal. My first thought was 3D printing, but testing would need to be done to see how much stress a 3D printed shaft/hub could take.

[kprzewodek]

This interfaces with quite a number of GM seats. It's a long list so I'll try to dig that out. It is specifically used for the recliner function in the power seats. I may have a few of these star shafts laying around that I can send if I find enough....maybe cut into pieces. I'll also see if we can find some scrap at our Tier 1.

Regarding efficiency I too was a bit surprised but that's what comes out of our dyno measurments. Actually too much efficiency is a problem in seat and window applications in that you don't want movement as the car bounces about on rough roads. In this motor there's a worm and two stages of spur gears for ~179:1 gear reduction.

[topgun]

Does anyone have a CAD file for it?

[kprzewodek]

Originally Posted by topgun

Does anyone have a CAD file for it?

CAD model for the motor can be found at link through AndyMark. I should point out that there was an error in the first posted model which is currently in the process of being updated. I'll let you know when it is updated.