BaneBots Shorted, Now What Do I Do?

[StealthMentor]

I thought we had a case shorted RS775, the motor ran fine for break-in, and for a while after that during testing. Then it seized and popped the fuse we had in-line. After taking the case apart to investigate (a problem I have had since a young age ) I discovered the culprit to be a common paper staple had gotten between the magnets and rotor. I removed the offending staple and reassembled the motor, and it works, but now there is some endplay in the shaft. On a side note these motors were shipped strait to our shop, and used only there (we do not have paper staples in our shop) everything is in three hole binders.

Originally Posted by fox46

This is how we fix them....

http://www.youtube.com/watch?list=UU...&v=zpxolE76bZw

For some reason I thought that was legit. Why am I surprised to see that happen?

[jwfoss]

Dale(294engr],

Correct me if I am wrong, but you mention the RS-555 and RS-550. I was under the impression that the failures and case shorting was common place for the RS-775, and that the RS-550 has been a realitively good motor in the past.

[EricH]

Originally Posted by jwfoss

Dale(294engr],

Correct me if I am wrong, but you mention the RS-555 and RS-550. I was under the impression that the failures and case shorting was common place for the RS-775, and that the RS-550 has been a realitively good motor in the past.

I've only heard complaints on the RS775-18, even; though when a non-FRC application was talking about using the RS775-12 I did suggest that they check for the case short just to be on the safe side.

[Kohala2460]

QUICK FIX: CIM MOTOR. Nuff' Said.

We recieved our RS-775 motors and have despite all the forums saying they suck and never use them. We love them haha.

But to answer this forum. If replacing/shipping is an issue, maybe order another, or just replace is with a CIM motor.

2 CIM motor drive is just fine, unless you were trying to with with a mech. drive. otherwise if you are going with a 6-8-10-12-16 wheel drive, 2-3 CIM motors will serve just fine.

[jason701802]

The motor cannot be fixed, the shorting method can keep it running for a little while, but the motor will be weaker and will soon fail again.

BaneBots' lead time is shorter if you don't get a gearbox. If you contact them directly about your failed motor, they might be able to ship out a replacement even faster.

I would recommend replacing the motors with BB550s, FPs, or am-0912s. The FP and AM, except the the 0673, more closely match the speed of the 775s, making them better candidates for drop in replacement, with the FP 9013 being the closest in power. The motors on your lift could be replaced with AM or BB if you need the FP on the shooter.
It sounds like you're using P60 transmissions, am I right? If so, only the block that the motor directly attaches to needs to change. If you have access to a mill, you could redrill mounting holes that have the right spacing, otherwise you could buy a 5xx mounting block or find a local team who is willing to loan or donate one to you.

[Ether]

Originally Posted by jason701802

I would recommend replacing the motors with BB550s, FPs, or am-0912s. The FP and AM, except the the 0673, more closely match the speed of the 775s, making them better candidates for drop in replacement, with the FP 9013 being the closest in power.

RS775-18 273 watts

FP 0673 292 watts

FP 9013 209 watts

[nitneylion452]

Originally Posted by Ether

RS775-18 273 watts

FP 0673 292 watts

FP 9013 209 watts

He was using Price is Right rules. "Closest without going over."

In all seriousness, I would absolutely contact BaneBots about a possible replacement and avoid self-fixes. Remember that if you open the motor (take off the case) it is no longer competition legal.

[jason701802]

Closest in power between the ones that I thought were a good choice based on speed. Going with a FP-0673 or BB550 would more likely need a gearing change.

[Ether]

Originally Posted by jason701802

Going with a FP-0673 ... would more likely need a gearing change.

It depends on how the motors are being controlled. You could make the 0673 "look" like a 775-18 by running it at a lower voltage to get the same torque and speed.

@dexo568: How are you controlling the motors?

Motor Calculator  build MCALC32ab 1/19/2012 610pm

M7-RS775-18 @ 12.00 volts:
   oz-in      Nm     rpm    rpm%    amps   watts out    watts in    eff%
     2.9   0.021   12663    97.4     4.0        27.4        48.0    57.0

FP 00801-0673 [MotorInfo4.1.PDF data] @  7.78 volts:
   oz-in      Nm     rpm    rpm%    amps   watts out    watts in    eff%
     2.9   0.020   12663    94.1     4.7        27.2        36.4    74.6

[Wayne TenBrink]

Is this a problem with Banebots RS775-12's, or does it also affect the RS775-18?

[Dad1279]

Originally Posted by Wayne TenBrink

Is this a problem with Banebots RS775-12's, or does it also affect the RS775-18?

The problem is with the RS775-18. Not sure about the -12's.