Electric Motors and Controllers for Use in ... - CAFE Foundation

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One has the option to select a single large motor or two or more smaller motor to get the desired thrust. Rob Honeycutt used twin Hacker motors in his successful Extra 330L, using a speed reduction drive to the prop. Hacker followed up with multiple motors in geared drive arrangements – a twin-motor item and a four-motor design that produced 87 pounds of thrust through a 30-inch propeller, and cost $2,995. Because the four motors required four electronic speed controllers and four battery packs, it and the twin-motor system shown above were soon replaced by y larger, g single g motor designs. g http://www.hackerbrushless.com/ San Carlos, April 24, 2009 8
Most model motors in the size ranges of interest in this presentation are brushless, and are either inrunners or outrunners. Inrunners are built like traditional brushed motors, but take their speed control from an electronic speed controller. Outrunners reverse the major parts of the inrunner motor, with the stator mounted in a fixed, central position, and the rotor spinning around in the outer casing of the motor. The propeller is fastened to the spinning casing, a great deal like the configuration of WWI rotary engines. Taking signals from the speed controller, the motors outer magnets are turned on an off at 120-degree phased intervals. Each time a pole is activated, it draws the rotor toward it. The speed controller acts as the interface between the battery and the motor. Since the battery is always at the same voltage, the controller has to modulate that power to allow the motor to turn at different speeds. A series of MOSFET transistors act as switches in the speed p controller and vary y the width of the pulses sent to motor. San Carlos, April 24, 2009 9
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Page 3 and 4: “The many experiments made during
Page 5 and 6: This book, a compilation of article
Page 7: Following a heart attack in April,
Page 11 and 12: “The servo signal is a simple dig
Page 13 and 14: Inrunners tend to be more efficient
Page 15 and 16: Plettenberg has an interesting spin
Page 17 and 18: The DMSV (Deutscher Motorschirm Ver
Page 19 and 20: Installed on the PAP1400 powered pa
Page 21 and 22: This simple operational drawing of
Page 23 and 24: This cutaway of a Lynch Motor shows
Page 25 and 26: Randall Fishman won best new design
Page 27 and 28: Mark Brierle pulled into Tehachapi,
Page 29 and 30: APAME and ACV are now working on th
Page 31 and 32: Patrick McLaughlin of Mountain High
Page 33 and 34: KLD Energy Technologies, located in
Page 35 and 36: Apex Drive Laboratories uses a dual
Page 37 and 38: “The controller can commutate the
Page 39 and 40: “Sicme Motori, technological part
Page 41 and 42: Combining a Rotax 914 with a motor
Page 43 and 44: This motor is promising because of
Page 45 and 46: One must consider the total cost of
Page 47 and 48: From the University of London Press
Page 49 and 50: In a discussion with Alan Fishman,
Page 51 and 52: M My friend f i d and d mentor, t M

Electric Motors and Controllers for Use in ... - CAFE Foundation

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