Why are digital encoders better than analog tachogenerators?
• Analog tachogenerators have brushes that wear out and therefore require maintenance. Also because of this brush wear, the electrical output can vary and cause process control variations. With a digital encoder there are no wearing parts other than bearings so there is no periodic maintenance. Avtron Modular encoders even eliminate the bearings! • Analog tachogenerators are made from copper and iron, whose properties change as time and temperature change. A digital encoder’s output pulses per revolution (PPR) will remain the same over both time and changes in temperature. • Digital encoders cost less than “precision” analog tachogenerators. • I need to retrofit some encoders onto some old motors that presently have analog tachogenerators mounted on them. What should I use? • If your analog tachogenerators are BC46, BC42, or RE210 flange styles mounted on NEMA 56C face adapters, then often all you need to do is mount any solid shaft Avtron encoder with a NEMA 56C face. This method allo
