Brushless controllers - RC-Monster Forums

rc4x4nut · **Brushless controllers -** 12.03.2005, 02:39 AM

I was wondering if there is a controller that can handle rpms up to 65k. I read in the lehner 2250 thread that 120 and 150 amp controllers can handle up to 42k. I want to be able to spin the lehner motors to about 60k max. Is there any controller that can do this for me. Oh the vehicle is going to weigh no more than 3 lbs rtr. The motor that I was thinking about is the LMT 1920 or maybe the basic 5300.

12.03.2005, 03:01 AM

I don't know about the basic series, but the 1920 can only handle 50,000 RPMs before the bearings are toast. Why do you need such highh RPMs? If you are running on 21-36 cells, you can use the 3695 controller, if you are running 5-20 cells, you can use the 12020 or 9920 controller.

rc4x4nut · 12.03.2005, 03:23 AM

The battery is thunder power 2100 mah 3S. I just weighed the car and its 1.5 lbs rtr. I dont need the torque of a low kv motor so I am leaning towards the rpms now for a little more speed.

12.03.2005, 03:25 AM

What type of car is it and what is the amp rate of the lipolies?

rc4x4nut · 12.03.2005, 03:38 AM

Here are the specs on the batteries

2100 mAh, 3 cells (11.1V), 16G wire, 4-pin balancer connector
Rating: 15C (31.5A) continuous, 20C (42A) burst
Dimension: 34mm x 100mm x 20mm

As far as the type of vehicle, that will be revealed as soon as it becomes RTR. Weight was tallied using manufacturers weights

12.03.2005, 03:52 AM

Hehe, ok. The 12020 or 9920 should be fine for that application, they don;t have an RPM limit.

coolhandcountry · 12.03.2005, 09:22 AM

They do have a limit it is just in the 100,000 rpm bracket. For that size car may be consider a 380 can. I have not ran these motors but metal man and a few others really like them for a light car.

12.03.2005, 04:26 PM

Well, I meant that they don't have a realistic rpm limit, because there aren't too many motors that can handle those RPMs!

Serum · 12.04.2005, 05:07 AM

the 120 and 150A controllers (micro's) should be available with this other steeringboard/software as well. (so they don't have got that limit) my guess is that you are planning on using a micro 20120 ? you could use a warrior too, (9920 would serve your purpose)

rc4x4nut · 12.04.2005, 09:26 AM

Serum: Yes I plan to use the micro controllers. I was thinking of the 12020

Serum · 12.04.2005, 09:30 AM

Ask Mike, if he can get one without the 42K limit..

nbcaznmaster · 12.04.2005, 09:34 AM

i wanna see a vid of that car at! lol, its gunna rip at 60000

RC-Monster Mike · 12.04.2005, 11:24 AM

The micro and warrior 20120 and 20150 controllers are good up to 100k rpms. The 42k limit is for the 36 cell controllers only and does not apply to the 20 cell controllers so have no fear!
Also, I have 3695 controllers without the rpm limit as well(100k limit like the 20 cell controllers).

SpEEdyBL · 02:59 PM

What??????

A mini-T battery powering a 1/10 truck motor and a monster truck controller doesn't make any sense at all. With that 3s 2100 battery you need a 14-16 turn 1515, which will have about 5,000 kv. Then you need a 60 amp controller to go with it. Not a 120 or 150 amp controller that will take up your entire chassis space. Btw, the setup I mentioned will be faster, acceleration will be better and you will have more runtime than the other setups mentioned.

The power does not come from the motor nor the controller. It comes from the battery and only the battery. You simply match the motor and the controller to acheive the best electrical to mechanical energy efficieny.

rc4x4nut · 12.04.2005, 04:22 PM

Quote:

Originally posted by SpEEdyBL
What??????

A mini-T battery powering a 1/10 truck motor and a monster truck controller doesn't make any sense at all. With that 3s 2100 battery you need a 14-16 turn 1515, which will have about 5,000 kv. Then you need a 60 amp controller to go with it. Not a 120 or 150 amp controller that will take up your entire chassis space. Btw, the setup I mentioned will be faster, acceleration will be better and you will have more runtime than the other setups mentioned.

The power does not come from the motor nor the controller. It comes from the battery and only the battery. You simply match the motor and the controller to acheive the best electrical to mechanical energy efficieny.

I understand how power is made. I was going to go with Lipos but I constantly have kids around my rcs and I cannot be around to monitor the charging lipos, plus the nimh is more forgiving. Not only that since the vehicle is so light weight that I need the weight to keep the vehicle on the ground. As of right now my motor mount only accepts 540 motors. If i can fab up a motor mount that will take a 400 then I can go with the 1515.