Hello everyone,
First time posting..
Im planning to start a quadcopter project with 4 dc motors 12volts and 5amps as stall current (0.4 amp nominal)
The problem is that i cant find any motor driver with those specs in the market in my country . Only l298n or l293 so i thought either i have to build my own h-bridge for each motor which seems a bad solution, Or try to limit the input current .
Medtlili:
Hello everyone,
First time posting..
Im planning to start a quadcopter project with 4 dc motors 12volts and 5amps as stall current (0.4 amp nominal)
The problem is that i cant find any motor driver with those specs in the market in my country . Only l298n or l293 so i thought either i have to build my own h-bridge for each motor which seems a bad solution, Or try to limit the input current .
Hello back at you. I agree, you have more planning to do.
Paul
For a quadcopter you don't need a motor driver, just a good logic level MOSFET for each motor, with the lowest possible Rds(on) and capable of 50 Amps. One DIY example
Or are you planning on reversing the motors?
I agree with jremington, if you are using dc motors, MOSFETs rather than h-bridges.
But I also think that brushless motors with a hobby ESC for each give better performance.
jremington:
For a quadcopter you don't need a motor driver, just a good logic level MOSFET for each motor, with the lowest possible Rds(on) and capable of 50 Amps. One DIY exampleOr are you planning on reversing the motors?
No just speed control
I'll check out the link
vinceherman:
I agree with jremington, if you are using dc motors, MOSFETs rather than h-bridges.
But I also think that brushless motors with a hobby ESC for each give better performance.
It is a better option but im on a budget here
Those items are out of reach for me
Do you think a 12volt/0.4A motor with an ancient/inefficient L298 and multi-cell (12volt) battery can lift a quadcoper off the ground?
Leo..
It is a better option but im on a budget here
You are in luck! A good MOSFET costs < $1 US.
Medtlili:
Hello everyone,
First time posting..
Im planning to start a quadcopter project with 4 dc motors 12volts and 5amps as stall current (0.4 amp nominal)
The problem is that i cant find any motor driver with those specs in the market in my country . Only l298n or l293 so i thought either i have to build my own h-bridge for each motor which seems a bad solution, Or try to limit the input current .
Please post link to data on your motors. They may not even be suitable for rotorcraft, that takes very
high power/weight ratio (beyond most motors).
Wawa:
Do you think a 12volt/0.4A motor with an ancient/inefficient L298 and multi-cell (12volt) battery can lift a quadcoper off the ground?
Leo..
Not to mensh the heat sink the size of a garage door
MarkT:
Please post link to data on your motors. They may not even be suitable for rotorcraft, that takes very
high power/weight ratio (beyond most motors).
I actually dont have any more info on them. Still have to measure its RPM.
I got them from some car windscreen wipers pumps.
Any ideas on how to know if they are powerful enough to lift a very light quadcopter (hopefully)??
Medtlili:
Any ideas on how to know if they are powerful enough to lift a very light quadcopter (hopefully)??
Yes. Go read the drone forums and see what other people are using successfully.
DC Pager motors (smaller in diameter than a pencil) are used in micro quads, weighing less than an ounce.
Some of the older quads used geared DC motors. This matched the available RPM of the motor with the requirements of blade size and blade rpm for efficient lift.
But virtually every quad bigger than the palm of your hand uses brushless motors today.
You will need to determine what diameter and what pitch of prop you will use. Those motors are probably not meant to have a prop attached. You will need to manufacture some type of prop mount.
You will likely be guessing how much current those motors can take before they burn out.
Or, if you can get a prop attached, power it up and measure the lift.
Here is an article on how to make a DIY thrust meter using a scale to measure the thrust.
vinceherman:
Yes. Go read the drone forums and see what other people are using successfully.
DC Pager motors (smaller in diameter than a pencil) are used in micro quads, weighing less than an ounce.Some of the older quads used geared DC motors. This matched the available RPM of the motor with the requirements of blade size and blade rpm for efficient lift.
But virtually every quad bigger than the palm of your hand uses brushless motors today.
You will need to determine what diameter and what pitch of prop you will use. Those motors are probably not meant to have a prop attached. You will need to manufacture some type of prop mount.
You will likely be guessing how much current those motors can take before they burn out.
So now i got the specs of the motors 16900Rpm and 17mN/m torque
Are they suitable for this project and how can calculate the weight that could lift?
how can calculate the weight that could lift
Not possible with the information you have at present.
See reply #12.
Medtlili:
Are they suitable for this project
Almost positively no, they are not suitable.
They are likely very heavy things meant to last the lifetime of an automobile.
But I do not want to stop you from experimenting.
If you place value in experimenting with the components you have available, give it a go. Build the thrust meter and see what you can expect to get out of it.
I am in a different position. I have been in the radio control hobby for a long time. I have flown radio control helicopters and quads back when the just barely flew, and only for 2 or 3 minutes. Everything was too heavy. As technology advanced, lighter more powerful batteries became available.
Better motors (brushless).
Better mechanical setup.
vinceherman:
Almost positively no, they are not suitable.
They are likely very heavy things meant to last the lifetime of an automobile.
But I do not want to stop you from experimenting.
If you place value in experimenting with the components you have available, give it a go. Build the thrust meter and see what you can expect to get out of it.I am in a different position. I have been in the radio control hobby for a long time. I have flown radio control helicopters and quads back when the just barely flew, and only for 2 or 3 minutes. Everything was too heavy. As technology advanced, lighter more powerful batteries became available.
Better motors (brushless).
Better mechanical setup.
Thank you sir for your feedback
i am going to keep going with these motors .
i'll get back to you with the results
Maybe ask later on for the wireless communication as i intend to build the radio controller myself
Medtlili:
Maybe ask later on for the wireless communication as i intend to build the radio controller myself
@Robin2 has a great Simple nRF24L01+ 2.4GHz transceiver demo
If I were doing this, I would buy a second hand radio control transmitter and rip out the electronics. Replace them with a nRF24L01+ that reads the joysticks (and any switches I decide to include) and send that data to the receiving nRF24L01+. But it also would be valid to get 1 or 2 simple joysticks and make your own box.
The used transmitter already has the right form factor, plenty of room inside for your gear, and likely has a rechargeable battery and external charger.