160A 정/역회전 PWM 전자속도제어기(ESC)로 일반 전압용과 고전압용 2가지가 있습니다. RC 수신기 전원용(BEC) 5V/1A 출력기능이 있어 별도의 전원 없이 사용 가능합니다.
- 구동전압 : 6~8.4V 일반형(2S) -Option 7.2~14V 고전압용(3S)
- MOSFET 모터 드라이브
- 마이크로콘트롤러 지능 제어
- LED신호 상태 표시
- 저전압 보호 기능
- 무게 : 22g
① PWM 제어 입력신호 ② 모터연결
③ 배터리 연결 ④ LED 표시
⑤ 동작스위치
<참고자료>
The Signal
Quadrocopters are built with brushless DC motors. A common mistake is to assume that these are conventional DC-motors, and can be driven as such, which is far from true!! Actually, a brushless DC motor is a permanent magnet AC motor with a block waveform. I won't go into detail, but this is important stuff! Because of this AC-block waveform we can't just drive this motor with a normal H-bridge, other circuitry is required. It would be very possible to build this ourselves, but the challenge is pretty low and because this is part of the power-circuit, the risk of introducing power-loss is too high. This makes that we use what the industry has provided for us: the ESC(Electronic Speed Controller). We can just hook up our motor and our battery to the ESC. If this is driven with a specific PWM signal, the speed of the motor will vary. This is what the PWM signal looks like:
First send a 1 ms pulse, then send the second pulse that controls the speed (max. speed = 1ms, min. speed = 0ms) and then wait until the total period is about 10ms. The waiting time can be longer than 10 ms because it would be hard to do this with RC otherwise. It is only the pulse length that is important. From this information, we know that we have to generate a PWM-signal of 100Hz (period 10ms) with a duty cycle that is variable between 10% and 20%. We will have to be able to do this 4 times independently, because a quadrocopter has four motors that have to be able to operate at different speeds (duh!).