Re: R/R relocation
Here's a great explanation of what and how the rectifier/regulator works and why relocate it. A big thank you to Evan Breyn
On Dec 19, 2004, at 11:45 PM, Evan Breyn wrote:
> The stator puts out A.C. current. The rectifier/regulator turns it
> into 12-15 volts DC. On our bikes, the stationary Stator (Fig 1) is
> mounted to the crankcase cover and sits inside the flywheel Rotor. The
> Rotor has 2 magnets that (engine running) rotate around the Stator.
> These magnet produce a "North-South" pole flux (current) in the stator
> coils. This current is called "A.C." current since it fluctuates +/-
> voltage in a "Sine Wave". The stator is wired so that there are
> actually 3 circuits producing A.C. current. Each circuit A.C. wave is
> 1/3 out of phase with the previous winding.
> It is important to understand these things:
> • The stator A.C. output voltage varies with engine RPM. The more
> RPM the more voltage. So, the stator output must be "Regulated" to
> provide 12-15 volts into the bike system. The raw A.C. output from
> each circuit is about 50volts ac at medium RPM.
> • The A.C. output is convert to D.C. by "clipping" the bottom
> (negative) portion of the A.C. wave off. The A.C. current has been
> "rectified" so that only the positive portion remains.
> • The "Regulated" and "Rectified" output is 12-14 volts positive DC
> and can be considered to be somewhat "dirty". Since the negative
> output is simply chopped off the AC, the positive DC output is more
> like a slightly fluctuating "sawtooth" wave. This is good enough for
> automotive purposes but would wreak havoc on delicate computer
> • Lastly, understand that the AC current is provide between any
> combination of 2 of the 3 yellows wires coming out of the stator. The
> AC phase is "floating" above the bikes -12 frame ground. That means
> that NO yellow wire is connected to ground. You measure the AC output
> of the stator between yellow wires only.
> The Regulator-Rectifier rectifies the A.C. current by using 6 diodes
> (2 per phase). The more complex part of the RR is how it regulates the
> higher DC current down to provide a steady state 12-14v. There are
> several variations of the process but in simplest terms a circuit
> monitors the output voltage and "shunts" (partially diverts) the
> excess portion to ground. The RR has a lot of current constantly
> flowing through it (diodes, etc..). AND, the excess voltage is being
> divert directly to ground. So, the RR gets very hot in the process.
> The construction is totally about dissipating this heats. Notice the
> heat fins. Less noticeable is that the RR circuits inside are encased
> in Epoxy and essentially glued into the heat sink metal body. This is
> why we like to relocate our RR's to a place where fresh moving air can
> pass over them.
> Hope this helps a little on the understanding of the electrical system
> of our motorcycle.