Hi, I'm a newbie and this is my first post and already asking help. Please forgive if I am used to metric measurement.
I'm building a permanent magnet generator using 8 NdFeB magnets (500x200x10 cm), installed on 200mm in diameter iron disc (5mm thickness). The goal is to build a wind generator.
For coils, I wound 8 coils, 220 wound each, 0.5mm in diameter. The dimension of each coils are 650x26x10 mm. Both magnets and coils are set to 45 deg.
For testing, I'm using a 12v dc motor.
When testing, each coils' reading 26vac. I then connect them in series and parallel (leading to 1 phase) and add full brigde 6A diodes. The reading then became 15.8vdc.
I connected it to a 12V-35A lead acid battery to charge it and here lies the problem. The battery reading before connection was 12.6vdc. When connected, it drops to 11.9 and continues to drop roughly 0.1 volts/minute until I disconected them when it reads 10.6v.
The question is of course why? What am I missing? Can anyone help?
Some clues or pointers:
- no heat coming from the coils.
- almost no heat coming from the diodes.
- the motor speed drops significantly when connected to the battery.
- I don't have the gauge to read the motor speed.
All ideas are utmost appreciated. Thanks.
I'm building a permanent magnet generator using 8 NdFeB magnets (500x200x10 cm), installed on 200mm in diameter iron disc (5mm thickness). The goal is to build a wind generator.
For coils, I wound 8 coils, 220 wound each, 0.5mm in diameter. The dimension of each coils are 650x26x10 mm. Both magnets and coils are set to 45 deg.
For testing, I'm using a 12v dc motor.
When testing, each coils' reading 26vac. I then connect them in series and parallel (leading to 1 phase) and add full brigde 6A diodes. The reading then became 15.8vdc.
I connected it to a 12V-35A lead acid battery to charge it and here lies the problem. The battery reading before connection was 12.6vdc. When connected, it drops to 11.9 and continues to drop roughly 0.1 volts/minute until I disconected them when it reads 10.6v.
The question is of course why? What am I missing? Can anyone help?
Some clues or pointers:
- no heat coming from the coils.
- almost no heat coming from the diodes.
- the motor speed drops significantly when connected to the battery.
- I don't have the gauge to read the motor speed.
All ideas are utmost appreciated. Thanks.