best glue for hall sensors??????

[friedwires]

i'm replacing the halls in my hub motor and would like to hear opinions on the best glue to use.i also have a few loose windings i would like to keep from vibrating.i have a west system epoxy setup that i use for teak work,but there are no temp ratings on the containers.and i also have a tube of 3m 5010 which is super strong and rated for 100c.

 

[Jeremy Harris]

Mine are all glued in with thickened (with colloidal silica) West epoxy, simply because I had it to hand. It does soften at around 100 deg C or so, so isn't the best choice if you anticipate that your motor is going to get really hot. In my applications the motors stay cool, so it isn't a problem.

There are higher temperature epoxy resins available, plus all epoxies can have the temperature at which they soften increased a fair bit if they are heated during the final curing stage (i.e. once the resin has cured to a semi-solid state). Baking resins at around 100 deg C or so for the final cure will raise the transition temperature, at which the stuff starts to soften. My only worry with doing this on a hub would be ensuring that all the other parts in the hub are OK at high temperatures.

Jeremy

 

[friedwires]

yea,i have a can of the thickener too.it makes the epoxy more managable.but being that i live in a hot climate,and my motor is overvolted .i think i'll need something more heat resistant.thanks jeremy.

 

[texaspyro]

JB Weld is the hillbilly's favorite stickum. Holds up at engine block temperatures... better than duct tape. Devcon Titanium (the industrial stuff, not the commercial stuff) is also wicked stickum. I have seen tractor gear teeth built out of it.

 

[friedwires]

i've heard jb weld has metal it.and may also conduct electricity.

 

[texaspyro]

Never believe what you hear... It may have metal in it, but it does not conduct. I bonded two 6-32 jack screws to an ovenized oscillator can with JB Weld. There is over 2 gigohms resistance between them (the limit of my hand held meter).

Their FAQ says it is an insulator. Also it is rated to 500 degrees F. That ought to survive in a motor... Oh yeah, it's also microwave safe. Should be OK for use outside the containment field of your ion plasma motor

 

[Floont]

JB Weld definitely.

It is NOT conductive. I just tested it with my multimeter and it is as good as any insulator.

It survives high temperatures as the others have said.

A trick I use to make the JB Weld less brittle, is to alter the resin to hardener ratio from the 1:1 ratio in the directions to about 1.2:1.

FA

 

[friedwires]

thanks for the tips guys. anyone else care to reply?