speed control
rbsalyer
Posts: 2
I'm a new guy here
and not much of a technician, nor designer, nor fabricator..
I'm looking for some help in finding a device. I have a project that I'm working on that involves operating a model airplane electric motor. The motor is dc and is brushless and has three leads. In a normal model configuration, the motor is connected to an electronic speed control which is driven by a signal from a receiver on the plane. I want to be able to vary the speed of the motor with some sort of pot. The power source is 12 VDC. the motor operates from 0 to 12 volts .and turns slower or faster .at 12 vdc it turns around 48thousand rpms. It's a ducted fan motor. I'm using it to move air in a .well call it a science project and don't want to be involved with transmitters and receivers etc I've looked on the net for 3 wire PWM motor speed controls and all I can find are 2 wire controllers and I can find schematics for three wire PWM controllers that are designed to run fans on computer motherboards and such...
Can any one hllep me out here?
I'm hoping there is a supply of remanufactured speed controls maybe fantasy but I'm hoping and if that doesn't fly maybe a schematic of something I could construct myself...
Thanks
rb
I'm looking for some help in finding a device. I have a project that I'm working on that involves operating a model airplane electric motor. The motor is dc and is brushless and has three leads. In a normal model configuration, the motor is connected to an electronic speed control which is driven by a signal from a receiver on the plane. I want to be able to vary the speed of the motor with some sort of pot. The power source is 12 VDC. the motor operates from 0 to 12 volts .and turns slower or faster .at 12 vdc it turns around 48thousand rpms. It's a ducted fan motor. I'm using it to move air in a .well call it a science project and don't want to be involved with transmitters and receivers etc I've looked on the net for 3 wire PWM motor speed controls and all I can find are 2 wire controllers and I can find schematics for three wire PWM controllers that are designed to run fans on computer motherboards and such...
Can any one hllep me out here?
I'm hoping there is a supply of remanufactured speed controls maybe fantasy but I'm hoping and if that doesn't fly maybe a schematic of something I could construct myself...
Thanks
rb
Comments
You will still need the ESC (electronic Speed Control) to handle the power demanded by the motor. They are relatively inexpensive and can be found across the web.
The ESC expects a signal normally provided by the radio receiver. There are several circuits to simulate that signal, or just use a Stamp or other microcontroller.
Cheers,
I believe technically you don't have a DC motor. The ESC converts the DC to AC which the brushless motor uses.
There are lots of cheap ESCs at HobbyKing.com. Parallax sells this one.
You need to make sure and get one that can handle the current your motor requires.
finding a 12v servo tester is proving to be a challenge .one for less than 30 bucks anyway .
You don't need a 12V servo tester. The one I linked to will work just fine with normal hobby ESCs.
The ESC is powered by 12V (or whatever battery pack you're using) the servo tester is powered by 5V. Many ESCs include a battery elimination circuit (BEC) so you don't need a separate 5V supply.
You'd plug the 12V battery into the ESC and the servo tester into the other connection on the ESC and the ESC (if it has a BEC) will power the servo tester.
If you provide a link to the motor you're using we might be able to help you select an ESC. If you don't have a link then post a picture of the motor. We really need to know how many amps it will draw before we can suggest an ESC.