brushless motor inq

[topforcein]

Ok I decided to move up to a bit of technology and buy mself a brushess setup.

So I took a trip to my lhs last week and set myself up with everything I need.

Today I thought I would instale it into my stadium blitzer I put the motor in first and I rolled it forward and backword to see it I got the pinion right on the gear and it made a noise like the pinion was,nt sitted correctly on the gear so I took it out and checked it and all seemed fine so I put it back in and it made the same noise again. So I swoped the motor for the stock one to see if that one made the same noise but that was all smooth and with no noise so I put tye brushless back in pushed the truck back and forth again and it made same noise again .

As any one had this problem

[theboomfish]

Some if not all brushless motors sound like crap when you manually rotate them like that. They are very notchy as the rotor rotates passed the magnets. Especially if the comparison against the stock motor is as you say.

[Daves956]

How long are the motor mounting screws and what motor are we talking about?

[InsaneJim69]

My speed passion 5.5r is like that. Sounds like gears grinding. Its fine when up and running though. I also took the motor out and rried turning it by hand and it was hard to turn the shaft by hand. I contacted speed passion and they said thats what its meant to be like.

James

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[topforcein]

The motor is a speedpassion 9.5r made by schumacher racing it come as a combo set with the esc

The motor mount screws are the stock that came in the kit 3x30mm screws

[Percymon]

Are you using a new pinion? Is the grub screw longer than the previous one ?

[topforcein]

No I am using the kit pinion 13 tooth one and the grub screw is the same

[wolfdogstinkus]

Ditch the kit pinion and get a steel one ASAP.

friends don't let friends drive with aluminium pinions.

[topforcein]

Tbh that is one thing I never give thought to change unless for speed

[wolfdogstinkus]

The aluminium ones wear out very quickly and then destroy the rest of the gearbox, the steel ones don't seem to wear at all.

[Gruntfuggly]

Mine's pretty noisy too...

I usually mount the motor without putting the bolts through the cover on the opposite side first - just to check the mesh...

[topforcein]

I already do offer up the motor first as l don't always trust the motor pinion adaptors and the instructions . It is one thing I have learn,t since my first build in 1989. I actually move the pinion while in situe if it allows. In this case I tryed a fare few different possions even placing the motor into the hole and hand held the motor against the gear and pushed back and forth but still got the same noise

[Vrdetailing]

The way the brushless are designed you can feel them picking up magnetically on the poles as you turn them.

I have found that on some of my gearboxes they make a noise and cog slightly on initial acceleration.

The Mad bull and rising fighter are the worst... My Truck does it if you pull off in third... The DT02 however is very smooth.

i have also had it on some Heli Builds...

I think its the combination of certain motors and gearing...

i have not had any damage from it yet.

[speedy_w_beans]

If you're comparing a brushless motor against a silver can, the magnets inside the brushless motor are substantially stronger and you can feel "detents" as you try to rotate the shaft by hand. These are the points where the magnets are most in line with the poles of the stator. The noise you hear in the gearbox when spinning everything by hand is the sound of the gear lash between the pinion, spur, and all the other gears in the gearbox. At certain points the pinion is trying to pull the spur along; at other points the pinion is trying to hold back the spur. The gear lash (gap between teeth) causes the clacking. The situation changes when the motor is under power and is not being spun by hand.

A high quality brushed motor with strong magnets will also exhibit the same effect. You may not have noticed it in the past because kit standard silver cans are weak in comparison.

[theboomfish]

If you're comparing a brushless motor against a silver can, the magnets inside the brushless motor are substantially stronger and you can feel "detents" as you try to rotate the shaft by hand. These are the points where the magnets are most in line with the poles of the stator. The noise you hear in the gearbox when spinning everything by hand is the sound of the gear lash between the pinion, spur, and all the other gears in the gearbox. At certain points the pinion is trying to pull the spur along; at other points the pinion is trying to hold back the spur. The gear lash (gap between teeth) causes the clacking. The situation changes when the motor is under power and is not being spun by hand.

A high quality brushed motor with strong magnets will also exhibit the same effect. You may not have noticed it in the past because kit standard silver cans are weak in comparison.

Nice one, that is exactly what I wanted to say but didn't know the correct terminology. Thanks

[Vrdetailing]

And the cogging can be eliminated by a sensored system... thats when the motor chatters as it finds its phase position.

[topforcein]

I noticed the noise when the truck was pushed forward and backwards by hand not spinning the wheels by hand

I have run low turn brushed motors years ago inu my topforce and never noticed that kind of noise before

The esc is sensored but I have not put any thing else in the truck yet no esc no wire loom nothing only the motor no wires on that either

[Yonez]

Put a pinion on the motor and hold it in your hand. Now turn the pinion. Is it the same noise/feel you are getting?

I was amazed the first time I turned a brushless motor by hand :-)

[topforcein]

Right ok I decided to try it in my tt01 and I have got the same noise from that also

[topforcein]

Another trip to my lhs today and I took the stadium blitzer with the motor with me. And as soon as the owner herd it he called over a tamiya know it all( I don't meen that in a bad way at all) and straight away he said it called cogging, it will do it when pushed by hand but will be ok when power is applyed so nothing to worrie about . So at that good news I decided to buy a ew hop ups for my tt01. So a busy day tommorrow .