Hello,
I need a brushed motor for a offshore project, around 19500 tpm and that can handle Lipo 3S. What is the difference between the two models you sell? Do they heat a lot?
Thanks
Leolo
Do you mean these two?
They are actually the same motor - BaneBots had stopped selling them for a while but graciously provided their source as our customers were still requesting them. They offer them largely as products which fit directly with their gearboxes. Banebots continued to receive requests so decided to carry them once again.
Thanks
Any speed vs torque difference? Need it for my old offshore to reach 50km/h approx.
Both are compatible with Lipos 3s?
Why the second one is still not in stock?
Kind regards
Leolo
They should be the same motor, from the same motor manufacturer. Both work very well at 11.1V (or 12.4V charged).
RB-Wtc-03 sold out faster than the other, and as such it’s not currently in stock.
Missed your previous question regarding heat - they consume really high current (~23A normal), so yes, they do heat up, and you need to restrict the duty cycle to around 25% to allow for cool down time.
If you need a fast motor which won’t heat up as much, can you consider BLDC?
What do you mean bu reducing cycle ? I have an ESC 60a quickrun.
Not sure that brushless can be an option as i have countergear mecanisms with pinions, as well as cardan (see Jetstream 800). Was thinking about 1700 - 1800kv but does not want to break everything.,.
To confirm, the ESC that you have is for brushed (2 wire) or brushless (3 wire) DC motors?
The duty cycle is the time the motor should be under load vs. cooling off: https://en.wikipedia.org/wiki/Duty_cycle
For normal brushed DC motors, it should 25% active, 75% cooling off (no current). This can translate to 15 min ON, 45min OFF.
Since you’re talking Kv, it sounds like your ESC may be for BLD motors, and would not work with the RS-550 brushed DC motor.
Currently my offshore is with a brushed motor and brushed esc.
Usually do less than 10mn then stop for 10-15mn, 2 or 3 times.
Are the brushed motors including a cooling system?
I was mentioning kv for an alternative solution because I understood that you were asking me if I could consider brushless (“BLDC”?)
Some (but not all) larger brushed motors include a built-in fan at the rear (notice the two openings in the case).
A brushless DC (BLDC) has three wires, and can run for longer times than a brushed DC motor.
https://www.robotshop.com/en/bldc-motors.html
Which one would have the same power than the 550 brushed motor?
Is it risky with a cardan and pinions transmission ?
If you consider the maximum power of the 550 to be 250W, then you’d be looking for a BLDC with the same power. However, if you need a specific rpm and/or Kv rating as well, then something like this would be in the right ballpark:
Don’t see any reason why it would not work in that kind of transmission - they are used extensively in RC vehicles as the propulsion motor.
I do not need much torque for a offshore.
Concerning the compatibility with a cardan (near propeller), some people replace cardan by a flex transmission to avoid any risk of breaking when turning at high speed. What do you think?
Is this motor waterproof ? And will a ESC 80a be sufficient ?
The BLDC motor given as an example is not at all waterproof. Note that you also need a three wire ESC (BLDC, NOT brushed).
Regarding mounting, it makes sense, though I (personally) do not have much experience with that type of application.
Reinkort
Is the possible to find brushless electric motor with power 3.0-3.5 kW for 3 blade propeller with diameter 20 inch? The rotation speed, adjustable up to 10 000 rpm.
RobotShop doesn’t carry a motor like that, but it likely exists somewhere.
Hello,
I Saw you also sell brushed 755 18V 19500 rpm and a 775 18V. What differences with the above mentioned 550 motors?
Would they fit RC boats? And do they accept Lipos 3s?
Thanks
755: https://www.robotshop.com/en/banebots-rs-755-18v-19500-rpm-brushed-dc-motor.html
775: https://www.robotshop.com/en/rs-775-motor-7000rpm-12v-7613oz-in.html
A lot is different: nominal voltage, torque, rpm, current consumed etc. Take a look at the “specifications” tab.
It’s best to use a 3S with a 12V nominal and a 5S with an 18V nominal. They are general purpose motors, so cannot see why they cannot be used in RC boats provided they don’t get wet and are cooled properly. However, note that most RC boats use brusless motors for good reason.
What happens if i use or with 3s only? Would it nevertheless be faster than a 540?
The motor’s “nominal” voltage is the voltage at which it operates most efficiently. Lowering it from 18V to 12V means the specs change, from the rpm and current to the torque provided. There does not seem to be a voltage:rpm curve available, nor a Kv rating, so the rpm you’ll get when operating at 12V is a bit unknown. There’s a chance it will be the same fraction as 12/18, so maybe 13,000.
Hello
Do you have the same 540/550 brushed motor with higher rpm (more than 19500)?
Thanks!
Can’t think of any. You might need to go brushless.
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