[WIP] Third Party Motor

[MrNumbskull13]

Did it turn out faster than the original 9398? If so how much faster?

[Boxerlego]

Yea it turned out faster than the original 9398, But the lack of torque made it stall on the smallest of hills.

[MrNumbskull13]

Yea it turned out faster than the original 9398, But the lack of torque made it stall on the smallest of hills.

Theoretically, mine is geared 1:33.45 I think and should still manage 540rpm (that is including a 10% speed loss due to friction). So it is about as fast as a buggy motor geared 1:2 and might have more torque...

[TechnicRobot]

Recently, i also made similar experiment like you to make LEGO motor. i have made a Technic cross axle coupler and bracket on general DC Motor. Then, the motor can be connected with other LEGO Technic parts.

Also, due to the motor speed very high (low torque), so i created a gear box to gearing down to increase torque, and used on Technic set 9396 Helicopter for testing.

[MrNumbskull13]

That's a really good experiment you conducted there! It seems to work very well! Did you come across any issues I should take note of?

Edited February 14, 2014 by MrNumbskull13

[TechnicRobot]

That's a really good experiment you conducted there! It seems to work very well! Did you come across any issues I should take note of?

when my copper tubing glue with cross axle extension connector using Epoxy, need to very accurate vertical, otherwise the motor will not smooth (friction between the motor axle and beam hole)

[JM1971]

Could always double up on the gears like this tamiya gearbox to spread the load.

Does that motor have enough power for flight?, because its looks like it to me. :D

[MrNumbskull13]

Could always double up on the gears like this tamiya gearbox to spread the load.

Does that motor have enough power for flight?, because its looks like it to me. :D

I thought about doing that before but it would also double the friction, which would slow down the motor. I hope my trophy truck will be flying over the bumps. xD

[efferman]

When using a third party motor, why not a size 540 or 380 of rc cars?

Edited February 16, 2014 by efferman

[MrNumbskull13]

When using a third party motor, why not a size 540 or 380 of rc cars?

I have a truggy with a 540 motor, it's really fast but I think it would destroy lego. Maybe I'll try a 380 after this, thanks. (I wasn't sure what size was smaller than 540)

Also, does anyone know how to calculate the torque of a motor? (Preferably in mNm)

[efferman]

The 540 are not all brushless, or for racing a standard mabuchi 540 costs roundabout 5 euros and shouldnt have to much torque

[MrNumbskull13]

Mine isn't brushless either, I've seen the exact motor for about £10, maybe I'll get one after I test out this. :)

[Boxerlego]

Theoretically, mine is geared 1:33.45 I think and should still manage 540rpm (that is including a 10% speed loss due to friction). So it is about as fast as a buggy motor geared 1:2 and might have more torque...

Sounds Great! The motor that I used with the 9398 crawler has a 5 pole armature which it has good amount of torque behind it. Tho, the motor max rpm is around 8000 at 12volts. The rpm on the wheels was around 400 with a decent amount of acceleration to reach the top speed with the crawler but the thermal fuse inside the V2 receiver would cause speed hiccups on the motor around 5 minutes of use.

When using a third party motor, why not a size 540 or 380 of rc cars?

It just depends if the motor can surpass the Buggy motor with standard Lego gearing.

[MrNumbskull13]

Ok I tried to figure out how much torque I could produce but the results were terrible as I don't know how to find the efficiency of a motor....

The metal connector should also be made soon...