Re: Regulator Question - What's the ceramic bar on the side for?

Posted by someone on October 15, 2001 at 08:26:47 from (130.230.92.208):

In Reply to: Regulator Question - What's the ceramic bar on the side for? posted by Alberta Mike on October 14, 2001 at 20:32:37:

The other coil or relay functions as a regulator.
When the anchor of the generator spins in an electrical field it produces a voltage. The voltage produced depends of the amount of the electrical field and the speed the anchor is spinning. A portion of the produced voltage is used to generate the field.
If the voltage from the generator becomes too high (at high engine speeds) the relay connects a resistor (the ceramic bar) in series with the wire that supplies power to the electrical field making the field weaker. That causes the voltage to drop to a suitable level. If the resistor is broken the generator doesn't work at high engine speeds.
New resistors are available and they are cheap, but you should know how many Ohm's the resistance is. You should also know the power rating of the resistor. Are there any markings left in that broken resistor? You should be able to determine the power rating by measuring the current (I) in that point where the resistor should be. The formula is: P=R*I*I (P=power). The resistor should be able to handle at least the power P minus the power the field winding takes (that can be calculated by measuring the resistance of the winding and using the formula above). You can try different resistors and measure the output voltage to determine the correct Ohm-value (my quess is something between 1-20 ohms). That can also be calculated if you know the current (I) through the resistor: R=U/I (U is the voltage loss desired to occur in the resistor). The output voltage shouldn't be much over 6...8 V at high engine speed and not lower than 6 V (or whatever is the voltage when the other coil disconnects the charging due to the low voltage).

I hope this helps a little. I know this post is long and confusing but english isn't my regular language. If there are mistakes, please correct them.

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