Product overview
The STEAM MD3220-1000KV-J is a gold brushless motor for the AK420 and 380/400/420/450-class competition helicopters. Its third-generation construction combines precision CNC-machined 6061T6 aluminum alloy, large bearings, 180-degree neodymium-iron-boron magnets and internal active cooling fins. The motor uses hand-wound, 0.86mm single-strand copper wire with high slot fill. Its mechanical dimensions include a 32mm stator diameter, 20mm stator thickness and 40.8 mm outside diameter. The body measures 54.5 mm long, with a total weight of 172 Grams.
The motor has a 1000KV RPM/Volt rating and supports LiPo batteries up to 6s. Maximum continuous ratings are 85 Amp and 1750 Watt; peak ratings are 105 Amps and 2260 Watts for 5 seconds. Motor timing spans 5deg~12deg, with 5° advance recommended, and drive frequency spans 8kHz~32khz. A 60A electronic speed controller is recommended for everyday operation, while an 80A controller enables maximum performance. Mounting hole spacing is 25mm, and the 5mm-diameter shaft has a motor shaft length of 21mm and an overall shaft length of 90 mm.
