Can BL motors be used in a starter box?
#1
Can BL motors be used in a starter box?
Hi to all.
I'm wondering if it's possible to mount a couple of, say 13.5, bl motors in a starter box? If you've heard of, seen it, or did this yourself let us know. I'm on the verge of attempting this later today. If time allows me. But I have no idea how to drive the motors. Most bl motors use a three wire setup and a starter box only has a positive and negative. So I'm a bit leary of doing this. But I just want to find out.
Thanx in advance for any info
I'm wondering if it's possible to mount a couple of, say 13.5, bl motors in a starter box? If you've heard of, seen it, or did this yourself let us know. I'm on the verge of attempting this later today. If time allows me. But I have no idea how to drive the motors. Most bl motors use a three wire setup and a starter box only has a positive and negative. So I'm a bit leary of doing this. But I just want to find out.
Thanx in advance for any info
#2
Tech Elite
iTrader: (1)
It could be done but you would need a brushless ESC since that is what provides the switching to run a BL motor.
The question would be WHY? Reduced maintenance? I have an eight year old OFNA with twin 550 motors that still turn over stubborn engines and all I do is charge the batteries and clean the box. Same for my 12V chrome top.
The question would be WHY? Reduced maintenance? I have an eight year old OFNA with twin 550 motors that still turn over stubborn engines and all I do is charge the batteries and clean the box. Same for my 12V chrome top.
#4
Tech Elite
iTrader: (1)
Buy a new box or replace the motors. Or use LiPo batteries (4 cell, 14.8V) for a little kick up in power but then you need to buy a LiPo charger.
Usually the motors go bad if the flywheel is misaligned which strains the motors, then they heat up too much and burn out or up.
BL would be great but how will you get it to run (are you aware that it works by the ESC sending a series of on and off current to spin the rotor/magnet) whereas in a brushed motor all you need to do is energize the brushes.
Usually the motors go bad if the flywheel is misaligned which strains the motors, then they heat up too much and burn out or up.
BL would be great but how will you get it to run (are you aware that it works by the ESC sending a series of on and off current to spin the rotor/magnet) whereas in a brushed motor all you need to do is energize the brushes.
#5
I'm not sure how BL motors are driven. The slotted/sensorless motors use the frequency from the motor after the initial power is given from the speedo. Then the freq. from the motor is read by the ESC. But with the slottless/sensored motors they have the sensor/timing ring which sends the freq. to the ESC. At least that's how I've understood it.
In this starter box I notice very little difference when switching from stick packs to lipo. But in my other starter box I do notice a difference. The lipos provide great power for that one.
OK. Scratch the BL idea. Do 775, 550, and 540 motors all have the same size of shaft? Can pressed on pinions be used on all three sizes of motors?
In this starter box I notice very little difference when switching from stick packs to lipo. But in my other starter box I do notice a difference. The lipos provide great power for that one.
OK. Scratch the BL idea. Do 775, 550, and 540 motors all have the same size of shaft? Can pressed on pinions be used on all three sizes of motors?
#6
Tech Adept
Not quite, a brushless motor is in effect a 3 phase ac motor, the speed control is actually generating 3 phase AC current 120 deg apart.
#8
They dont make the 8V into 120V.
They send pulses in 3 phases AC 120° spaced apart, 360° from one rotation divide by 3 phases is 120°.
Not all Brushed motor have the same shaft, a lot of the bigger ones have 5mm shafts as to the normal 1/8 inch. then there are flat spotted one and full round ones.
They send pulses in 3 phases AC 120° spaced apart, 360° from one rotation divide by 3 phases is 120°.
Not all Brushed motor have the same shaft, a lot of the bigger ones have 5mm shafts as to the normal 1/8 inch. then there are flat spotted one and full round ones.
#10
One could make a crude speed controller for the brushless motor. The operation is too complex for me to explain right now, but it is possible for less than the price of a real ESC. You only need to have it run for a few seconds to get the nitro started, right? So throttle control is not neccisary, just full throtle. I can build one, as i have a fairly good understanding of these sorts of things.
http://www.rctech.net/forum/showthre...ng+electronics
Cheers!
http://www.rctech.net/forum/showthre...ng+electronics
Cheers!