Model Train Journal

The can motor in my Weaver F7 is shot. I’ve found 3 replacement motors. One is 7,130 RPM, the next is 11,000 RPM, the last is 20,000 RPM.
Which one do in need? or does it matter?




Thanks for any help!!

I would go with the slowest one (7,000 RPM). Otherwise, your engine may take off, never to be seen again.

Yves

I put a slow Pittman in my Williams "J" - and have always been disappointed with a flashy passenger locomotive creeping around my loop.

Hey Jon,

Not to be a broken record but, it would help to know the gear ratio. Without it, I would go with the mid RPM.

Jay

So there you have it. Three motors, three different opinions from three hobbyists who actually build model locomotives. Here is the real solution:

Use my aircraft safety wire and Toyota tube trick, so you can change motors in three minutes, and test all of them. Choose the one that makes you happy.

Can't fully decipher the tag. Oil spot? And PB won't let me copy and blow it up.

But, a Mabuchi RS-550 series is just a tad over 19,000 RPM no-load.


Can't tell if that is followed by a 8 1 1, an S 1 1, or the 1 1 is an M

It’s an RS-550SH motor.

https://www.ebay.com/itm/High-speed-DC- ... 1936027442

specifically a SH.


https://www.robotshop.com/en/rs-550-mot ... oz-in.html

no SH suffix, 19,300 RPM

But, it seems Mabuchi part numbers aren't designed to make sense.

The Mabuchi 550 is made from 1.2V to mains (240V) windings and used in everything from screwdrivers to hairdryers

Each Mabuchi motor has a detailed model number (about 6 digits) which tell the wind, Magnets, Poles, brushgear etc . 550SH only tells us it is by Mabuchi, has the long armature (55mm long) (not sure what the SH is).

Specifications: (for reference)
1) Voltage: 6.0V (operating range: 2.4V - 36.0V)
2) Speed: 11,120rpm
3) Current: 1.15A
4) Stall torque: 532N.m (5,426g.cm)
5) Stall current: 82.5A

Mechanical features:
1) Out diameter: 35.8mm
2) Shaft diameter: 3.175mm
3) Body length: 57mm
4) Standard shaft length: 75, 80, 85mm

Dang, Dave! You’re quite the can motor engineer!
I’m thinking the 11K RPM motor will be my best bet!
I’m just waiting for it to show up in the mailbox.
Check out how hideous this sounds!
https://youtu.be/VXI8w-vOXAI

Video with drive shaft removed:
https://youtu.be/Zj1NJ6sugdM

mab 550 seems to be a three pole. Mab 555 seems to be a five pole. Maybe.

LS PRC made garbage often use Mabuchis. Style favoured among one or two manufacturers costs twenty three cents apiece in bulk (or they did 20 years ago when I cared)

My Weaver 4-4-2 with a Mubachi can motor doesn’t sound anything that bad!
The 4-4-2 can with shell off.
https://youtu.be/I2G0BxyvXik

Running:
https://youtu.be/Glw1LqXWZ9g

2railjon wrote:Dang, Dave! You’re quite the can motor engineer!
I’m thinking the 11K RPM motor will be my best bet!
I’m just waiting for it to show up in the mailbox.
Check out how hideous this sounds!
https://youtu.be/VXI8w-vOXAI

Video with drive shaft removed:
https://youtu.be/Zj1NJ6sugdM

Jon,
We have a vacuum cleaner that doesn't make that much noise.

ScaleCraft wrote:Can't fully decipher the tag. Oil spot? And PB won't let me copy and blow it up.

But, a Mabuchi RS-550 series is just a tad over 19,000 RPM no-load.


Can't tell if that is followed by a 8 1 1, an S 1 1, or the 1 1 is an M

Dave, it is RS-550SH DB070813

2railjon wrote:Dang, Dave! You’re quite the can motor engineer!
I’m thinking the 11K RPM motor will be my best bet!
I’m just waiting for it to show up in the mailbox.
Check out how hideous this sounds!
https://youtu.be/VXI8w-vOXAI

Video with drive shaft removed:
https://youtu.be/Zj1NJ6sugdM

Just can't please you guys! You get "SOUND" for free, and all we hear is gripe, gripe. gripe!

https://www.mabuchi-motor.com/product/k ... tions.html

Round motor, carbon brushes, medium large armature diameter, unquantified housing length, three poles, anisotropic magnet or rare earth, and a particular specification unpublished.
Armature wire diameter and number of turns hard to determine.


The RS-550SH no longer shows up in their search function. There are contact numbers on the website.