Do not use wrong polarity on the 880 dirt bin.

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Do not use wrong polarity on the 880 dirt bin.

Postby LazyRoomba » August 22nd, 2016, 9:30 pm

I did this, and killed the motor. Looking at the motor, their's no way to open the cover without permenantly damaging the mounting plate.

IMG_20160823_022330.jpg

IMG_20160823_022319.jpg


Now looking for a small, powerful motor.

upto 24mm diameter,
10mm tall,
23.5mm screw spacing using M2 screws,
2mm shaft.

Any ideas would be great! Thanks.
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Re: Do not use wrong polarity on the 880 dirt bin.

Postby vic7767 » August 22nd, 2016, 10:51 pm

See if this is close. No matching part numbers.

http://www.ebay.com/itm/1PCS-For-Nidec- ... SwxYxUu2RC
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Re: Do not use wrong polarity on the 880 dirt bin.

Postby LazyRoomba » August 23rd, 2016, 5:15 am

I've purchased. Won't be delivered until the end of next month.

Thanks

Edit:

I've roughly measured the are for the 880 motor, and their is room for after market motors. The absolute maximum I managed to measure was:

31mm diameter
27.4mm height

As technology improves, It won't be long before someone has an 880 motor mod (Like from an RC plane or something).
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Re: Do not use wrong polarity on the 880 dirt bin.

Postby a1robotrepair » August 23rd, 2016, 2:50 pm

You may want to try and fix your motor. I hooked one up in reverse, only momentarily, read 0.9A and shut it down before any damage occurred. You are probably looking at a failed Hall effect transistor. I see they are labeled on the board. The motor is a stock, modified for iRobot, motor.
I think it's this one before factory modification. http://www.nidec.com/en-Global/product/motor/category/A010/B010/P0000018/
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Re: Do not use wrong polarity on the 880 dirt bin.

Postby LazyRoomba » August 23rd, 2016, 5:57 pm

Hmm.. Had a closer look, this is the best image I could get

IMG_20160823_225051.jpg


I'm assuming the H# on the PCB is a hall affect sensor. Their was an audible "pop" before it died.
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Re: Do not use wrong polarity on the 880 dirt bin.

Postby a1robotrepair » August 23rd, 2016, 6:02 pm

Have you checked the 3 windings continuity?
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Re: Do not use wrong polarity on the 880 dirt bin.

Postby LazyRoomba » August 23rd, 2016, 6:08 pm

No continuity. Their's circuitry under the mounting plate, that I cannot access. Seems to be a chip or something there, can't make it out.
IMG_20160823_230553.jpg

IMG_20160823_230549.jpg


The PCB is sandwiched with the coil bushing.. it's press fit.
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Re: Do not use wrong polarity on the 880 dirt bin.

Postby LazyRoomba » August 23rd, 2016, 6:55 pm

Update:
Got the mounting plate off, will have to redesign and 3D print a new mount.

IMG_20160823_235134.jpg


Note the "hole" top right of IC1.. I think the IC blew.
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Re: Do not use wrong polarity on the 880 dirt bin.

Postby a1robotrepair » August 23rd, 2016, 8:10 pm

What, if any marking are on the ic? If none how many pins are there and how are they situated around it.
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Re: Do not use wrong polarity on the 880 dirt bin.

Postby LazyRoomba » August 23rd, 2016, 8:27 pm

IC1 is a BGA package, text on the chip is too small for me to read
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Re: Do not use wrong polarity on the 880 dirt bin.

Postby a1robotrepair » August 23rd, 2016, 9:46 pm

That's a lot of complexity for such a small motor. Can you identify where the motor coils are connected?
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Re: Do not use wrong polarity on the 880 dirt bin.

Postby LazyRoomba » August 24th, 2016, 5:48 am

I'll try and do a schematic today
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Re: Do not use wrong polarity on the 880 dirt bin.

Postby LazyRoomba » August 24th, 2016, 8:47 am

Did try, my probes kept slipping off the smd components, so wasn't able to trace where H1, 2, 3 went.

Screenshot_41.png
#

Hole in IC1:
IMG_20160824_134126.jpg
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Re: Do not use wrong polarity on the 880 dirt bin.

Postby LazyRoomba » August 24th, 2016, 5:48 pm

Just had a Frankenstein idea. The motor coil is ok, but the driver is fried, so what would it take to get the coil to run again? Would a pwm signal into a mosfet work? I know timing will be difficult without the hall sensors.
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Re: Do not use wrong polarity on the 880 dirt bin.

Postby a1robotrepair » August 24th, 2016, 8:27 pm

You need to figure out where the positive side of the coils are connected, where the pickup sensors are, and how the coils are switched. Give a brief description of the spinning part and fixed part. If the ic is fried, you're probably looking for a high speed DC brushed motor, 500mAh @ 12V and torque of vacuum assembly, as the brushless motor needs to know its position for switching the coils field.
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Re: Do not use wrong polarity on the 880 dirt bin.

Postby LazyRoomba » September 19th, 2016, 8:12 pm

Update:

Motor delivered today, and designed a plate to be 3D printed so the motor can be installed into the existing mountings.

Nidec_motor_mount_Roomba_2016-Sep-19_06-21-27PM-000_CustomizedView2088467679.png


Again, still working on my 3D printer, so will give another update within the next few days.

For those who want to use this motor,

http://www.nidec.com/en-IN/product/moto ... /P0000020/
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Re: Do not use wrong polarity on the 880 dirt bin.

Postby LazyRoomba » September 23rd, 2016, 9:41 pm

Done!

The motor does lack the power, but at least the bin now has suction. Saved me $60 on a new bin.

IMG_20160923_174705.jpg

IMG_20160923_175457.jpg

IMG_20160923_175754.jpg


Download the adapter:
http://www.thingiverse.com/thing:1787964
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