Precautions in servo motor encoder measurement！

Encoder signal measurement and processing is an important issue in servo motor control. The position, speed and acceleration of the motor rotor are derived from the encoder signal. The encoder pulse signal is measured and processed, and accurate information will be obtained, which is the basis of control. Conversely, it will mislead control.

Usually the encoder has A, B, Z pulse signals, and some additionally have U, V, W pulse signals. A, B signal: It is the motor position pulse signal, and the phase difference of the A and B signals can also distinguish the steering. The frequencies of the A and B signals are the same, the phase difference is 90, and their duty ratios are both 50%. The rising and falling edges of the A and B signals can be processed into pulses respectively through the circuit, and within one A pulse period, 4 appears. Pulses. Z signal: Zero signal, every time the motor rotates, Z pulse signal will be generated at zero position. In order to make the Z signal more reliable, it is generally specified that only when the A and B signals are high, the Z signal rising edge can be determined as The Z signal is valid. U, V, W signal: Used to judge the starting position.

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