my airplane - meetupfiles.meetup.com/12626532/myalternator.pdf · stc’d generator option bpe 14...

My Airplane

My Radio Installation

M Battery Box

Solar Option

350 milli amps in Fun Sun. But it doesn’t charge in cloudy conditions

STC’d Generator Option

BPE 14 Turbo Alternator STC’d

6 Amps @ 85 mph Internally regulated

Weighs approximately 5 lbs. $ 795.00 plus shipping

My Wind Powered Generator

DC Motor

A Typical DC Motor

Muffin Fan

Readily available Inexpensive Light weight Easy to mount

Brushless DC Motor

Stator Commutator Circuit

R/C Bruchless DC motor

1.4 inches in Diameter 3.6 ounces 14 volt tolerant winding Very high current winding $50

-

+

+

-

S N

N S

Brushless DC Motor

-

+ +

-

S N

N S

Brushless DC Motor

S N

N S

-

+ +

-

Brushless DC Motor

-

+ +

- 0

Brushless DC Motor

-

+ +

-

Brushless DC Motor

-

S

N

N

S

+ +

-

Brushless DC Motor

-

+ +

-

Brushless DC Motor

-

+

+

-

Brushless DC Motor

N S

S N

-

+ +

-

Brushless DC Motor

N S

S N

-

+ +

-

Brushless DC Motor

-

+ +

-

N S

S N

Parallel Connection provides higher Current capacity

Brushless DC Motor

N S

S N

-

+ +

-

Series Connection provides higher voltage

Brushless DC Motor

Brushless DC Motor Stator

Brushless DC Motor Stator

Modified Motor Stator

My Wind Powered Alternator

13.8 volts output 250 milli amp current limit About 15 hours of flight time so far

The Rectifier and Regulator

• Rectify AC to DC • Regulate Voltage about 14.5 volts DC • Monitor to display Voltage or Current

optional

Metering (optional)

R1

240 ohm400uF

50 v

AC LM317

Regulator

R2

2.6K ohm

R3

100 ohm R4

1 ohm

1 watt

D5

1n4007

12 volt

Batery

To be

charged200 mv Meter

Battery

9 v 14.50

SW1

ON/Off

0.000

00.00

Current

Voltage

Output

+

Serial windings

Higher Voltage

Parallel windings

Higher Current

DC+Vin Vout

Adjust

L1

10 mh

DC-

+in

-in

R5

9 K

ohms

R7

1 K

ohms

R6

99 K

ohms

2N2222A

1 Amp Bridge Rectifier

or

1n4007 x 4 each

(D1-D4)

+

~

~

Generator Regulator and Meter

-

C1

Q1

SW2

IC1

Part Description Qty

Battery 9 voly 1

Battery Clip for 9 volt 1

C1 400 uF 50 volt 1

D1-D5 1N4007 4

IC1 LM317 1

L1 10 mh 1

Meter Velleman LCD 1

Q1 2N2222A 1

R1 240 1/8 watt 1

R2 2.6K 1/8 watt 1

R3 100 1/8 watt 1

R4 1 ohm 1 watt 1

R5 9K 1/8 watt 1

R6 99K 1/8 watt 1

R7 1K 1/8 watt 1

SW1 1P1T 1

SW2 2P2T 1

Circuit board, Perf board as needed

Wire as needed

Fan motor Modified 1

Heat sink for Q1 1

Output

-

Brushless DC

Motor windings

Future development

• Working on a higher output version.

• Different muffin fan

– Output dependant on fan specs

• Bicycle 12 volt, 6 Watt dynamo

– 12 volts at 500 milli amps

• A new regulator with 500 milliamp current limit

12 Volt 6 Watt Dynamo

The 500 Milli-amp Alternator

The 500 milli-amp Regulator

This system has not been flight tested.

http://pcbheaven.com/wikipages/How_Brushless_Motors_Work/ http://www.pcbheaven.com/wikipages/How_DC_Motors_Work/ http://www.ti.com/lit/ds/symlink/lm317.pdf (the regulattor IC) http://www.frys.com/product/5434439#detailed (the meter)