Changchun Rongde Optics Co.,Ltd.

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  • Co.,Ltd.
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  • North Lake Development District,
  • Changchun 130102,China
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Phase alignment of incremental encodersⅡ!

Changchun Rongde Optics Co.,Ltd.   Release time:2018-11-14   Browse:1425

After removing the DC power supply, verify as follows:

1. Observe the U phase signal of the encoder and the UV back EMF waveform of the motor with an oscilloscope;

2. Rotate the motor shaft. The rising edge of the U-phase signal of the encoder coincides with the zero-crossing point of the UV line back-EMF of the motor. The Z signal of the encoder also appears at this zero-crossing point.

The above verification method can also be used as an alignment method. It should be noted that at this time, the phase zero point of the U-phase signal of the incremental encoder is aligned with the phase zero point of the motor UV back-EM potential. Since the U-electrode potential of the motor is different from the UV-line back-EM potential by 30 degrees, After this alignment, the phase zero point of the U-phase signal of the incremental encoder is aligned with the -30-degree phase point of the opposite potential of the motor U, and the phase angle of the motor electrical angle is the same as the phase of the potential waveform of the U opposite, so the incremental coding is performed at this time. The phase zero of the U-phase signal of the device is aligned with the -30 degree point of the electrical phase angle of the motor.

Some servo companies are accustomed to directly aligning the zero point of the encoder's U-phase signal with the zero point of the motor's electrical angle. To achieve this, you can:

1. Connect three stars with the same resistance to form a star, and then connect the three resistors connected to the star to the UVW three-phase winding of the motor;

2. Observing the midpoint of the U phase input of the motor and the star resistance with an oscilloscope, the U potential waveform of the motor can be approximated;

3. Adjust the relative position of the encoder shaft and the motor shaft, or the relative position of the encoder housing and the motor housing, according to the convenience of operation;

4. While adjusting, observe the rising edge of the U-phase signal of the encoder and the zero-crossing point of the opposite potential waveform of the motor U from low to high, and finally make the rising edge and the zero-crossing point coincide, and lock the relative positional relationship between the encoder and the motor. Align.



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