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Pulley Size for maximum power
The RPM must be 15% faster than the spec on generator
To reach 250 volt at the output .
New Installations
1800 rpm generators 180 vdc field
Power pulley diameter/2100RPM X (Max motor RPM)
Equal generator pulley . D/2100 X RPM
2500 rpm generators 230 vdc field
Power pulley diameter/2900 RPM X (Max motor RPM)
Equal generator pulley . D/2900 X RPM
3450 rpm generator 180 or 230 vdc field
Power pulley diameter/4000 rpm X (Max motor RPM)
Equal generator pulley . D/4000 X RPM
Existing Installation
Note:
Choose the easiest pulley to change.
Power pulley calculations
RPM written on generator name plate + 15% / Used RPM X diameter of the power pulley
Calculation of generator pulley
Used RPM / RPM written on generator name plate + 15% X diameter of generator pulley
Note:
The direction of the rotation has no importance.
Note:
Use C type Belts (.625 inch)