Working principle of servo motor encoder！

Servo encoder This basic function is the same with the ordinary encoder, such as incremental type A, A anti, B,
B, Z, Z and other anti-signal, in addition, the servo encoder also has a different place with the ordinary encoder, that is, most of the servo motor synchronous motor, synchronous motor start time to know the rotor magnetic pole position, It can be a great moment to start the servo motor, which requires a few additional signals to detect the current position of the rotor, such as incremental UVW and other signals, precisely because of these detection of the rotor position of the signal, the servo encoder appears Because A, B two-phase difference of 90 degrees, can be compared by A-phase or B-phase before the former to determine the encoder forward and reverse, through the zero Bit pulses, the zero reference bit of the encoder can be obtained. The encoder disc material is glass, metal, plastic, glass disc is deposited on the glass thin groove, the thermal stability, high precision, metal code directly to the disc and pass through groove, not friable, But the metal has a certain thickness, accuracy is limited, its thermal stability is worse than the glass of an order of magnitude, plastic disc is economical, its cost is low, but the accuracy, thermal stability, life are worse . Resolution - The number of pass or dark lines that the encoder provides at each rotation of 360 degrees is called the resolution, also known as resolution indexing, or the number of lines directly, usually 5 to 10000 lines per revolution

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