This 20A speed controller is a good affordable solution to power your brushless motor.

 

Specification

Output: Continuous 20A, Burst 25A up to 10 seconds.
Input Voltage: 2-3S Lipo, 5-9 cells NiMH. 
BEC: 2A / 5V Linear mode BEC.
Refresh rate of the throttle signal: 50Hz to 432Hz.
Max Speed: 210000rpm for 2 Poles BLM, 70000rpm for 6 poles BLM, 35000rpm for 12 poles BLM.
(BLM = BrushLess Motor)
Size: 42mm x 25mm x 8mm.
Weight: 19g.

Features

Safety arming feature: Regardless the throttle stick position, the motor will not spin after battery connected. 
Throttle calibration funtion: Throttle range can be calibrated to be compatible with different transmitters.
User programmable - Multiple program methods supported such as transmitter stick, LED Program Card.
Compatible with Lipo and NiMH battery.
Timing can be changed to be suitable for different brushless motors.
Full protection: Low voltage cutoff protection / Over-heat protection / Throttle signal loss protection.

Programmable Features

Brake- Off/On
Battery Type- Lipo or Nimh
Cuttoff Mode- Soft/Off
Cuttoff Threashold- Low/Medium/High
Start Mode- Normal/Soft/Super Soft
Timing- Low/Medium/High