Motor Equivilent

[grant_ploughbot]

Lemco changed the way the motors were produced to make them cheaper to manufacture apparently. The old ones were great but there's a lot of talk about the latest ones being by so good with shock or direction changes. A good hardened motor is the Agni 95 or or wind. Cedric Lynch moved on from Lemco and has been designing these newer motors with his new company (now called Saietta Group). They look the same as the Lem's but much improved.

[supernova]

Ok, my LEM is pretty old, 1980-1990s.

[typhoon_driver]

Good vintage

[LewisJP]

Thanks for all the input guys. Looks like I will be sourcing a couple of motors from china as per overkills suggestion. To be honest I am not sold on the brush-less motors yet. But to be fair Ive only used small ones in drones etc. Reading up on the RotoMax 150cc it looks promising, considering also you can couple two or more of these on the same shaft to increase torque. I guess the only way to see if it works is to try one. the weight saving would be nice.

[maddox10]

The rotomax 100cc should reach 9nm of torque. The 150 is a size bigger. With the higher RPM compared to brushed motors you can play more with the gearratios. I believe with some gentle persuation and battlehardening the big brushless are a fine option for weaponmotors.

[grant_ploughbot]

The biggest thing to consider with brushless motors in heavyweights for both drive and weapons are its thermal mass. An ETEK or other large brushed motors have a very large thermal mass and can be pushed to their limits for far longer periods before getting too hot and burning up. This means your brushless motors really need to be highly overpowered and geared correctly for the job they are doing to ensure they're running under far less load and in a more efficient state to minimise heat build up. Warhead runs the Scorpion 7050 motor with good success on the disc.

[overkill]

Did you modify the mounting at all? For all the motor's 10KW and 1.7Kg weight, Scorpion still uses M4 screws to hold it down.

[maddox10]

Gearing motors to save them.
Due the higher RPM of the brushless motors compared to brushed motors (6000+ for the Rotomax 100cc @37V) you can gear 'm down more, making the workload a tad less straining.

[grant_ploughbot]

Nick, the scorpion motor had an extended shaft made on the rear of the motor with a flange that bolted on the rear case to help minimise the outer casing from flexing and had a rear bearing to take the stress off the front bolts.