What are the methods for zero calibration of absolute value encoders in servo systems?

The absolute value encoder zeroing method for servo system zero calibration involves the fields of industrial automation and intelligent robots. Method: On the basis of keeping the universal AC servo drive unchanged, a method of compensating for the zero position calibration of the motor electrical angle is adopted to compensate for itservo motor The zero position deviation of the electrical angle during the initial installation process of the encoder affects the control effect of the control strategy due to the accuracy of the electrical angle calculation. Therefore, the improvement of the positioning accuracy of this angle enhances the overall control performance of the servo drive and increases its value in industry applications.

There are two methods for zero point calibration of absolute value encoder in servo system:

IfencoderThe value of has not been lost, and the MCP displays the second origin. Move the robot's first origin to match the second origin. The initial values of six encoders behind the door of Shishuo's electrical control cabinet are the absolute zero point of the robot at the factory, which can be inputted.

Absolute value rotary single turn absolute value encoder: measures each track of the photoelectric encoder during rotation to obtain a unique code. When the rotation exceeds 360 degrees, the code returns to the origin. This code can only be used for measurements within a rotation range of 360 degrees. Multi turn absolute value encoder: used for measuring rotations exceeding 360 degrees, using the mechanical principle of clock gears in encoder production. When the central encoder rotates, another set of encoders (or multiple sets of gears, multiple sets of encoders) is transmitted through gears. On the basis of single cycle encoding, additional cycles of encoding are added to expand the measurement range of the encoder. It is also determined by mechanical position encoding, and each position encoding is unique and does not need to be repeated, without the need for memory.

The method for zero point calibration of absolute value encoder in servo system is as follows:

Firstly; Apply a DC power supply to the UV winding of the motor with a DC current lower than the rated current, U in V out, and orient the motor shaft to a balanced position;

Secondly; Observe the highest count digit level signal of the absolute encoder with an oscilloscope;

Thirdly; Adjust the relative position between the encoder shaft and the motor shaft;

Fourth; Adjust while observing the transition edge of the highest count digit signal until the transition edge accurately appears at the directional balance position of the motor shaft, locking the relative position relationship between the encoder and the motor;

Fifth; Twist the encoder motor shaft back and forth, and after letting go, if the jumping edge can be accurately reproduced every time the motor shaft returns to the equilibrium position freely, then zeroing is effective.

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