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.43.HANG A WEIGHT ON ONE OF THE STUDSSPINESTATORROTOR100g WEIGHTChecking the balanceThe rotors have already been balanced in section 6.The wind turbine blades mustalso be balanced in the same way.When the unit is assembled, you should check thebalance again using the new procedure below.This is necessary because the rotordisk may not be perfectly central on the PMG shaft.PMG manual Page 39 February 2001Repeat the starting test (diagram 43) with each of the four rotor studs in the 3o'clock position.Try different weights, and find the lightest weight which will startthe rotor turning.If one stud needs much more weight than another, then the rotor isnot balanced.Fix small weights to the rotor until the balance is correct.Electrical testingCoil connection testIt would be helpful to have a multimeter when testing the PMG, but it is possible todo some basic tests with a 3 volt torch bulb.See diagram 44." Connect the wires 1B to 4A, 2B to 5A, and 3B to 6A.(Series connections of pairsof coils which are in the same phase.)" Set the multimeter to '10VAC' or similar (if you have one)." Connect the meter, or a bulb, between the wires marked 1A and 4B.44.TESTING THE COILSCIRCUITWIRINGSCHEMATICDIAGRAMDIAGRAMBULB OR1BMETERBLOCKCONNECTOR4ASERIES2BCONNECTIONS5A3B6A1ABULB4B2AACV1005B103A16BTEST THESEMULTIMETERNEXT" Rotate the PMG slowly by hand, about one revolution per second." The meter should give a reading of about two volts, or the bulb should flicker." Repeat the test with two more pairs of wires: 2A and 5B, 3A and 6B.In each case the result should be the same.PMG manual Page 40 February 2001If there is no reading, or a very low reading, then check that the series connections(1B-4A, 2B-5A, 3B-6A) are correct.If all these connections are good, then it ispossible that one coil has been reversed (placed upside-down).If any coils have been reversed, then it is necessary to do another test (see diagram45), to find out which one is at fault.Connect 4B-2A and 5B-3A as shown in thediagram.Now test between 1A and 6B.There should NOT be more than a very smallvoltage.If there is a voltage, or the bulb lights up, then reverse the connections(swap A for B) on the coils until the voltage drops to a very low level.When the faulty coil has been found, label the tails again, with A and B at the correctends.45.CHECKING FOR A REVERSED COILCIRCUITWIRINGSCHEMATICDIAGRAMDIAGRAM1BBLOCKBULB ORCONNECTOR4AMETERSERIES2BCONNECTIONS5A3B6A1ABULB4B2AACV1005B103A16BMULTIMETERThere will always be a small voltage in this test, because the coils are not perfectlypositioned in the mould.If the test gives more than one volt, then it should bepossible in future to make a better stator by placing the coils at exactly equaldistances apart in the mould.DC output testWhen these tests have been completed and the results are correct, then connect therectifier, as shown in diagram 46.Connect the tails 1A, 2A and 3A together.Connecteach 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, alsoa multimeter on 10 VDC (or similar).PMG manual Page 41 February 200146.DC TESTCOILS CONNECTED STARCIRCUIT1BBLOCKSCHEMATICCONNECTOR4A DIAGRAM2BSERIESCONNECTIONS5AV3B6A1A +2A3ABULB4BDCV5B6B10RECTIFIERSMULTIMETERRotate 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 bulbpresent).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 afaulty rectifier.Check the connections carefully.Try another rectifier.You can also test the PMG without a bulb or a meter.Simply connect the positive andnegative wires from the rectifiers together (all four) in a 'short circuit' [ Pobierz całość w formacie PDF ]