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  #16   Spotlight this post!  
Unread 12-01-2017, 04:07 PM
mman1506 mman1506 is offline
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Re: Redline motors

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Originally Posted by Michael Hill View Post
......I wouldn't go that far...I mean...teams like 16 and 2451 used them without much issue from what I hear.....
No better role model for your average FRC team than 16 and 2451. If 16 and 2451 can do it then everyone else should have no problem at all!
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Unread 12-01-2017, 04:09 PM
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Re: Redline motors

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Originally Posted by piersklein View Post
Pshhhhh. Get a load of this guy. Only using one battery! Ha!

Just use two batteries. Say the second one is just for added weight.


I'll give that one to you, not once did you say a LEGAL robot. (I want 4 batteries, 4 breakers, 4 PDBs, and 24 775pros total on my robot. The drivetrain will be so powerful I will win a pushing match with a bulldozer.)
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Unread 12-01-2017, 04:11 PM
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Re: Redline motors

Quote:
Originally Posted by Skyehawk View Post
Reality check: main breaker 120amps @ 12v = 1440 watts
....
Modelling the main breaker as 120 Amps x 12v is not reality and never will be. The real world doesn't work that way. There are so many more variables at play here.
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Unread 12-01-2017, 04:13 PM
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Re: Redline motors

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Originally Posted by CEF View Post
According to the other thread ( https://www.chiefdelphi.com/forums/s...4&postcount=44 ) these are the same motor. Just one is red.

So, the one you use will probably just come down to shipping cost and time.
I'm really curious what this means.

Are they the same output specs? or are they literally the same motor?
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Unread 12-01-2017, 04:18 PM
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Re: Redline motors

Quote:
Originally Posted by mman1506 View Post
No better role model for your average FRC team than 16 and 2451. If even 16 and 2451 can do it then everyone else should have no problem at all!
I’m not saying every team is like them. What I’m saying is that you shouldn’t automatically put a team on their DNP just because they have 775s in their drivetrain. You should watch the matches to see if they had any issues. My reason for invoking them was to say “surely they wouldn’t be on your DNP, right?”
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Unread 12-01-2017, 04:20 PM
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Re: Redline motors

Quote:
Originally Posted by Michael Hill View Post
I’m not saying every team is like them. What I’m saying is that you shouldn’t automatically put a team on their DNP just because they have 775s in their drivetrain. You should watch the matches to see if they had any issues. My reason for invoking them was to say “surely they wouldn’t be on your DNP, right?”
For first picks sure.

For 2nd picks (depending on the game) we are very likely unilaterally passing on all 775 drive teams (especially with a new and untested motor of unknown source and that hasn't been dynod (the new standard in FRC imo)).
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Last edited by AdamHeard : 12-01-2017 at 04:24 PM.
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Unread 12-01-2017, 04:28 PM
mman1506 mman1506 is offline
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Re: Redline motors

Quote:
Originally Posted by AdamHeard View Post
I'm really curious what this means.

Are they the same output specs? or are they literally the same motor?
Looking closely the brush holder on the 775 Pro looks to be ever so slightly longer when comparing the images. The drawings back this up with the 775 pro being just slightly longer.

(Edit: We know the Redline is made by CCL motors (AKA CIM) from the datasheet http://files.andymark.com/PDFs/am-37...nce+Curves.PDF Neither motors look like Machubi (Dewalt's and Banebots OEM?)
(Edit 2: I'm like 20% sure they have different OEMs)
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Unread 12-01-2017, 04:30 PM
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Re: Redline motors

Quote:
Originally Posted by bobbysq View Post
Out of curiosity, what would be expected out of code for a 775pro/Redline drivetrain beyond a quick tank drive class? I assume a safety amperage shutoff would be needed along with a way of checking if the wheels are spinning at the right speed through an encoder, right?
775 pro's will cook the rotor windings in a matter of seconds if they are stalled at battery voltage because of their low rotor mass. This is exactly the failure mode that so many experienced teams and mentors fear. Teams that successfully used them last year were cognizant of the issue, and pwnage went so far as to under-volt them to prevent the failure mode. This is aside from the problem of tripping the main breaker, which some teams are already doing on a 6 cim drivetrain.

Last edited by Tom Line : 12-01-2017 at 04:32 PM.
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Unread 12-01-2017, 05:59 PM
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Re: Redline motors

Quote:
Originally Posted by mman1506 View Post
Looking closely the brush holder on the 775 Pro looks to be ever so slightly longer when comparing the images. The drawings back this up with the 775 pro being just slightly longer.

(Edit: We know the Redline is made by CCL motors (AKA CIM) from the datasheet http://files.andymark.com/PDFs/am-37...nce+Curves.PDF Neither motors look like Machubi (Dewalt's and Banebots OEM?)
(Edit 2: I'm like 20% sure they have different OEMs)
Quote:
Originally Posted by Nick Lawrence View Post
The RedLine motor and 775Pro are identical in performance. The specs we post are from the manufacturer, and the specs on the VEXPro website are from their dyno testing.

The difference? This one is red and silver.

-Nick
See above

Last edited by JohnSchneider : 12-01-2017 at 06:06 PM.
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Unread 12-01-2017, 06:15 PM
mman1506 mman1506 is offline
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Re: Redline motors

Quote:
Originally Posted by JohnSchneider View Post
See above
https://www.chiefdelphi.com/forums/s...1&postcount=74
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Unread 12-02-2017, 10:07 AM
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Re: Redline motors

Quote:
Originally Posted by mman1506 View Post
Modelling the main breaker as 120 Amps x 12v is not reality and never will be. The real world doesn't work that way. There are so many more variables at play here.
Not incorrect. The key qualification is, are we talking short term or steady-state?

If steady state, I sure hope a ~120A limit holds. Otherwise this breaker is pretty worthless.

If transient, 120A is definitely not a hard limit. I have logged our modest 4-CIM robots peaking at near 300A transient. Full-speed direction reversals are fun.
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