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.

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