The working principle of servo motor encoder

The working principle of servo motor encoder

How does the servo motor encoder work? The servo motor encoder actually has similar functions to ordinary encoders, but there are also unique features because it uses synchronous motors, which use stronger and more complex signals, and require more professional personnel to operate.
Due to the 90 degree difference between A and B phases, the encoder's forward and reverse rotation can be distinguished by comparing whether A phase is in front or B phase is in front. By using zero pulse, the encoder's zero reference position can be obtained.
The materials of the encoder encoder encoder disk include glass, metal, and plastic. The glass encoder disk is a thin scribed line deposited on the glass, which has good thermal stability and high accuracy. The metal encoder disk directly passes through and does not have scribed lines, and is not fragile. However, due to the certain thickness of the metal, the accuracy is limited, and its thermal stability is one order of magnitude worse than that of glass. The plastic encoder disk is economical, with low cost, but accuracy, thermal stability, and short usage time.
Resolution - The resolution refers to the number of through or dark lines provided by the encoder per 360 degrees of rotation, also known as the resolution resolution, or directly measuring the number of lines, typically ranging from 5 to 10000 lines per revolution.