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FJR Motorcycle Forums
Technical & Mechanical Problems
Regulator voltage sensor
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<blockquote data-quote="Constant Mesh" data-source="post: 751327" data-attributes="member: 615"><p>No, the FJR's regulator is attempting to keep its output voltage constant no matter what the attached load. As the engine rpm increases the AC voltage developed by the stator windings increases. To keep a constant output DC voltage the regulator has to shunt more and more energy to keep the output voltage from rising.</p><p></p><p>If you add accessory loading less power has to be shunted by the regulator. When the load reaches the level where no energy is shunted the output voltage will begin to drop below the desired regulated value.</p><p></p><p>But it still might be desirable to use a remote voltage for controlling the regulator. Any accessory load attached at the battery will necessarily lower the battery charging voltage -- the added accessory current will increase the voltage drop between the R/R and the battery. If the regulator control voltage was taken at the battery the regulator would automatically compensate for the accessory voltage drop and full battery charging voltage would be available.</p><p></p><p>The FJR's charging system is crude but reliable and simple. It's not very efficient compared to a standard auto alternator system but it seems to be reliable.</p></blockquote><p></p>
[QUOTE="Constant Mesh, post: 751327, member: 615"] No, the FJR's regulator is attempting to keep its output voltage constant no matter what the attached load. As the engine rpm increases the AC voltage developed by the stator windings increases. To keep a constant output DC voltage the regulator has to shunt more and more energy to keep the output voltage from rising. If you add accessory loading less power has to be shunted by the regulator. When the load reaches the level where no energy is shunted the output voltage will begin to drop below the desired regulated value. But it still might be desirable to use a remote voltage for controlling the regulator. Any accessory load attached at the battery will necessarily lower the battery charging voltage -- the added accessory current will increase the voltage drop between the R/R and the battery. If the regulator control voltage was taken at the battery the regulator would automatically compensate for the accessory voltage drop and full battery charging voltage would be available. The FJR's charging system is crude but reliable and simple. It's not very efficient compared to a standard auto alternator system but it seems to be reliable. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Regulator voltage sensor
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