CHECKING FORA REVERSED COIL

WIRING DIAGRAM

CIRCUIT

SCHEMATIC

BLOCK NNECTOR SERIES CONNECTIONS

BULB OR METER

DIAGRAM

There will always be a small voltage in this test, because the coils are not perfectly positioned in the mould. If the test gives more than one volt, then it should be possible in future to make a better stator by placing the coils at exactly equal distances apart in the mould.

DC output test

When these tests have been completed and the results are correct, then connect the rectifier, as shown in diagram 46. Connect the tails 1 A, 2A and 3A together. Connect each of 4B, 5B and 6B to any three of the rectifier AC terminals (marked with 'S' symbol). This is the 'star' connection. Connect a bulb to the output. If possible, also a multimeter on 1 0 VDC (or similar).

 

DC TEST

COILS CONNECTED STAR

BLOCK CONNECTOR H SERIES CONNECTIONS

RECTIFIERS

Rotate the rotor by hand as before, approximately one revolution per second (60 rpm). The meter should show a steady reading around 4 volts DC (or 3 volts with the bulb present). The bulb should glow with a steady light, not flickering as before.

If there is no reading, or the bulb flickers, then there is a faulty connection or a faulty rectifier. Check the connections carefully. Try another rectifier.

You can also test the PMG without a bulb or a meter. Simply connect the positive and negative wires from the rectifiers together (all four) in a 'short circuit'. Now try to turn the PMG. It should be stiff but smooth to turn. If it trembles as you turn it then there is a fault.

Connecting the PMG to the 1 2 volt battery

Star and Delta connections

For low windspeeds, connect the coils 'star' as above. For high winds, and higher current output, connect the coils 'delta', as in diagram 47.