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Unread 12-15-2017, 02:28 PM
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pic: 8 BLDC Closed Gearbox

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Unread 12-15-2017, 02:29 PM
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Re: pic: 8 BLDC Closed Gearbox

this transmission is the biggest thing in robotics since wheels imo

dont @ me
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Unread 12-15-2017, 02:30 PM
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Re: pic: 8 BLDC Closed Gearbox

After seeing the video from Nidec, I became inspired to design a gearbox using eight of the revolutionary new brushless dynamo. This gearbox uses the high efficiency, cost effective motors to bring a new age of drive trains to FRC.

Pros:
- Dominate the field with a 25 fps robot.
- Control your robot with advanced algorithms using the four quadrant closed loop.
- Take advantage of the dynamo's high efficiency to make your batteries last longer.
- Never wait for motors to cool down thanks to the high heat dissipation.
- Encourage creative and elegant pneumatic designs.
- Slim 6.21"x8.44"x5.29" profile
- Lightweight gearbox weighing in at 14 lbs
- Low cost of ~$850 per gearbox

Cons:
- None.
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Unread 12-15-2017, 02:32 PM
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Re: pic: 8 BLDC Closed Gearbox

I feel it is worth pointing out that this will require 8 DIO ports and 8 PWM ports per gearbox.
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Unread 12-15-2017, 02:33 PM
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Re: pic: 8 BLDC Closed Gearbox

Quote:
Originally Posted by marshall View Post
I feel it is worth pointing out that this will require 8 DIO ports and 8 PWM ports per gearbox.
Or a LOT of PWM splitters
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Unread 12-15-2017, 02:35 PM
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Re: pic: 8 BLDC Closed Gearbox

Wow, for years my team has been struggling with the oh so treacherous effects of brush wear on our FRC robot. This will solve all our problems!
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Unread 12-15-2017, 02:35 PM
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Re: pic: 8 BLDC Closed Gearbox

Quote:
Originally Posted by Jon Stratis View Post
Or a LOT of PWM splitters
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Unread 12-15-2017, 02:38 PM
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Re: pic: 8 BLDC Closed Gearbox

Quote:
Originally Posted by marshall View Post
I feel it is worth pointing out that this will require 8 DIO ports and 8 PWM ports per gearbox.
Yes, because that is the biggest problem with this gearbox.
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Unread 12-15-2017, 02:43 PM
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Re: pic: 8 BLDC Closed Gearbox

Quote:
Originally Posted by Ty Tremblay View Post
That is a really cool graphic. I think you're trying to tell us... why stop at 8?
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Unread 12-15-2017, 02:43 PM
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Re: pic: 8 BLDC Closed Gearbox

Quote:
Originally Posted by Jon Stratis View Post
That is a really cool graphic. I think you're trying to tell us... why stop at 8?
By harnessing the power of fractals, we can have unlimited power on our robot!
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Unread 12-15-2017, 03:02 PM
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Re: pic: 8 BLDC Closed Gearbox

Quote:
Originally Posted by Ty Tremblay View Post
By harnessing the power of fractals, we can have unlimited power on our robot!
No, the power is still limited. We can have an unlimited number of paths it takes on the way to the wheels!

Edit - and by the way, just one of each splitters is enough - if each is a bus. Or you could use two of these on each.

Edit2 - Am I looking at this right? It looks like a single stage gearbox with two idler gears feeding the output directly.
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Last edited by GeeTwo : 12-15-2017 at 03:11 PM.
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Unread 12-15-2017, 03:08 PM
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Re: pic: 8 BLDC Closed Gearbox

Quote:
Originally Posted by Ty Tremblay View Post
By harnessing the power of fractals, we can have unlimited power on our robot!
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Unread 12-15-2017, 03:18 PM
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Re: pic: 8 BLDC Closed Gearbox

Quote:
Originally Posted by GeeTwo View Post
Edit2 - Am I looking at this right? It looks like a single stage gearbox with two idler gears feeding the output directly.


EDIT: I chose this design because it allows the efficiency of the BLDC motors to remain at its absolute peak (without having to go through pesky gear friction), while also minimizing the profile of the already slim gearbox. This is truly the level of simplistic and elegant design the motor was designed for.

Last edited by rafi : 12-15-2017 at 03:20 PM. Reason: adding detail
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Unread 12-15-2017, 04:30 PM
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Re: pic: 8 BLDC Closed Gearbox

Quote:
Originally Posted by rafi View Post


EDIT: I chose this design because it allows the efficiency of the BLDC motors to remain at its absolute peak (without having to go through pesky gear friction), while also minimizing the profile of the already slim gearbox. This is truly the level of simplistic and elegant design the motor was designed for.
So much power @40wattts*8
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Unread 12-15-2017, 06:24 PM
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Re: pic: 8 BLDC Closed Gearbox

Even if you assume you can run them at peak power (88 watts each 704 total) it's about the same power as two cims. Eight nidec's at 1.5 pounds each is twice as heavy as two cims and two talons (12 lbs v.s. 6 lbs). It's a shame they choose to introduce such a weak motor as the first BDC motor in FRC. Having worked with them on an electric racecar I know they can be so much better.
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