Source：Shengda Yu Published：2020-07-28 Clicks：7166
Phase alignment of absolute encoders.
The phase alignment of the absolute encoder has little difference between single-lap and multi-lap, which aligns the phase of the encoder and the electromechanical angle in one lap. At present, the very practical method is to use the measured phase after the EEPROM, memory encoder is randomly installed on the motor shaft. The specific method is as follows:
1. Install the encoder on the motor at random, that is, solidify the encoder shaft and the motor shaft, as well as the encoder shell and the motor shell.
2. A DC power supply is used to direct the UV winding of the motor, which is less than the rated current. U in and V out, the motor axis is oriented to a balance position.
3. The single-loop position value of the absolute encoder is read by the servo driver and stored in the EEPROM that records the initial phase of the electromechanical angle inside the encoder.
4. The alignment process ends.
Phase alignment of incremental encoders.
The alignment method between the phase of the UVW electronic commutation signal and the rotor magnetic pole phase, or the electric angle phase of the incremental encoder with commutation signal is as follows:
1. A DC power supply is used to direct the UV winding of the motor, which is less than the rated current. U in and V out, the motor axis is oriented to a balance position.
2. Use the oscilloscope to observe the U phase signal and Z signal of the encoder.
3. Adjust the relative position of the servo motor encoder shaft and the motor shaft.
4. while adjusting, observe the U belief jump edge of the encoder and the Z signal until the Z signal is stable at a high level (the default Z signal is normally at a low level), and lock the relative position relationship between the encoder and the motor.
5, twist the motor shaft back and forth, after letting go, if the motor shaft returns to the balance position freely, the Z signal can be stabilized at the high level, then the alignment is effective.