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

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Alan Cocconi has built up AC Motors with his highly original solutions to myriad quandaries in electric motors and drives. No longer at the helm of that organization, he is devoting his time to a project called Skybase, a surveillance system using seven separate solar-powered aircraft that will hook up in flight to form a 280-foot wingspan, sevenmotored stratosphere cruiser. Each of the seven individual aircraft will use the motor he originally designed for the Solar Impulse project, putting out a maximum 15 kW at takeoff, but slowing to produce 1.5 kW each at cruise. This 10:1 output ratio allows endless cruising, g with solar panels producing g power during the day, and charging a battery array in each plane for power through the night. He is not in favor of using fuel cells for this mission as they require heating to prevent freezing in the low temperatures at high altitudes, and relies instead on batteries in a central cluster in each airplane. Alan says that batteries provide 90-percent cycle efficiency. His ironless construction reduces inductance losses and allows generation of smooth currents at low speeds. p The motors will turn over at only y 800 RPM maximum. http://solar-flight.com/solong/index.html http://www.engineering.columbia.edu/news/archive/engnews_s98/cocconi.html San Carlos, April 24, 2009 http://www.designnews.com/article/3158-The_Quest_for_Perpetual_Flight.php 44
One must consider the total cost of batteries, including anticipated cycle life, to fully calculate the cost of powering electric aircraft. NiMH and NiCad batteries may be less expensive than lithium ion or lithium polymer, for instance, but three times as many are needed for an equivalent voltage. LiFePO4 batteries may have slightly lower voltages than straight lithium units, but promise more useful cycles. Any of this may be moot, because there may be a straight lifetime of three years for lithium batteries, regardless of their use. A new battery from Toshiba, Toshiba the Supercharged Ion Battery Battery, or SCIB, SCIB claims a life of 6,000 6 000 cycles. Its cost is unknown because Toshiba is releasing it only to OEMs, and its only current use is on the Schwinn Tailwind bicycle. San Carlos, April 24, 2009 45
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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 and 8: Following a heart attack in April,
Page 9 and 10: Most model motors in the size range
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: This motor is promising because 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

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