Staarter Mtr trouble shooting

[jen]

I am tired of working on it....I'll  take to W Va and work on it.  Finishing up  gauges install on my Sand Rail.  Oil pressure gauge with a Transducer signal to eliminate oil tube.

[WeeBee]

No Doubt !

 

[mikeexplorer]

Looks good to me, now that you flushed it. Try the meter test again from the shaft to any of the commutator points. Set meter to 100K ohms. See if that 10K reading goes away. Possible some brush dust got into the windings and caused the reading. 

Ideally it should read infinite to 10 megaohms. 

 

[jen]

OK Tomorrow.

[jen]

After cleaning I coated the commutator with CRC dielectric gel. It has a thick consistency like KY jelly so I had to rub it in all over the nonconductive surfaces,     My Fluke VOM is auto ranging so I do not need to set an ohm scale.    I only had a marginal improvement when measuring from the commutator to the commutator shaft it was 12 K ohms.

[mikeexplorer]

11 hours ago, jen said:

After cleaning I coated the commutator with CRC dielectric gel. It has a thick consistency like KY jelly so I had to rub it in all over the nonconductive surfaces,     My Fluke VOM is auto ranging so I do not need to set an ohm scale.    I only had a marginal improvement when measuring from the commutator to the commutator shaft it was 12 K ohms.

The leakage would be coming from the windings, not the commutator. Since you already cleaned it, it means the insulation is breaking down.

 

[jen]

Yes I think you are correct.  I am going to look for a replacement Commutator   assembly.   Cold here in FL tonight. I Had to bring my Bonsai Plant inside.  

[davefrombc]

7 hours ago, jen said:

Yes I think you are correct.  I am going to look for a replacement Commutator   assembly.   Cold here in FL tonight. I Had to bring my Bonsai Plant inside.  

Try  the end bell swap  before ordering  a new rotor

Edited February 24 by davefrombc

[jen]

Yes!!!   I am a cheap---!   So I will try that...Thanks!

[jen]

Agh  a dumb question...Do they make "Brushless VDC starter motors?   I mean my Dewalts are brushless and The big vehicle drives on the ET Adventure , Universal Studios Fl are Brushless (German).

[jen]

The ET Vehicles weigh over 3,500 lbs each and the brushless drives have plenty of torque.

[davefrombc]

1 hour ago, jen said:

Agh  a dumb question...Do they make "Brushless VDC starter motors?   I mean my Dewalts are brushless and The big vehicle drives on the ET Adventure , Universal Studios Fl are Brushless (German).

I don't know of any  brushless starter motors..  The brushless tools use an electronic circuit to  turn the 12v DC  into  3 phase  AC for the motors in them ..  That's why the higher price over  brushed versions.  Starter motors have very high current draw so would take quite a robust DC to 3 phase circuit  and  it would be very expensive to make the motor and power converter circuit.

[jen]

Thanks...I was just curious....Grandma would tell me "Curiosity killed the Cat."   Oh my, she was right about that.

[jen]

The Drives at ET Adventure were 3 Ph  50 Hz 400 vac.    but were DC drives via an onboard control panel.   Very reliable and lots of torque .

[mikeexplorer]

1 hour ago, jen said:

The Drives at ET Adventure were 3 Ph  50 Hz 400 vac.    but were DC drives via an onboard control panel.   Very reliable and lots of torque .

German made equipment? Those motors would still have brushes. I used to work at a plastics company and the extruders used a DC motor. But the drives were 60 Hz @ 480 volts., 3 phase.

 

[jen]

No these did not.   Special from Germany just for the ride.  I read German so i had to help them trouble shoot. Yes I worked om 250 HP DC Extruders also.  THey had a 9 ft extruder screw.  I would clean the commutator while it was running with a 2 inch wide "eraser".  THey were commonly used in plastic Extrusion.  However, I  worked on many that extruded Cherios" .  A the extruded "dough" came out forced through a die that formed the cherio a small 1 hp dc drive with a four blade cutter would cut the extrusion to give you that stuff you pour mild on in the  morning!