Wemotec HW750 Twin Motor Single Fan Development



		WEMOTEC HW750 TWIN MOTOR SINGLE FAN DEVELOPMENT
			THE INITIAL IDEA

The Wemotec HW 750 fan is a 5" diameter fan developed to fly larger EDF planes. Because the larger EDF planes require high amounts of watt input (2500 to 5000+ watts) to get the thrust necessary to effectively fly, motor selection for this fan has been a problem. The initial idea was to use two high KV motors and spread the amp load between the two motors. One motor is mounted in back of the fan the second motor is mounted in front of the fan. Both motor drive shafts are mechanically connected with the metal adaptor that goes thru the fan rotor. Initial tests using 2 Hacker B50 12XL brushless motors, and 2 Future Bo 55 ESCs proved that this method does work very well. The Future ESC has a mode called "Belt Drive mode" This has a soft start sequence that allows both motors to start up together very smoothly. Each motor was supplied by separate 26 cell CP 1700 packs. Amp draw was approximately 84 amps per motor or 169 amps (4394 watts) of power to the fan rotor. With 2 30 cell packs we expect to get into the 5000 watt range.
				This is the first test fixture we used to test the electrical properties and configuration of the motors. We also found that with the motor housings aligned electrically and rotors also aligned that start ups and runs were smoother. But it is not necessary.
	FAN CONSTRUCTION FINAL ASSEMBLY AND TESTING BACK TO RC AIRPLANE INDEX PAGE