Phase alignment of incremental encoders！

It should be noted that, at this time, the phase zero of the U-phase signal of the incremental encoder is aligned with the phase zero point of the motor UV back EMF, and the difference between the U-back EMF of the motor and the UV back EMF is 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 phase coincides with the phase of the U opposite potential waveform, so the incremental coding The phase zero of the U phase signal is aligned with the -30 point of the motor electrical encoder angle phase.
Some servo companies are accustomed to the encoder U-phase signal zero point and the electrical point of electrical direct alignment, in order to achieve this purpose, you can:
1. Connect three resistors with equal resistance to star type, then connect three star-connected resistors to the UVW three-phase winding leads of the motor.
2. To observe the U-phase oscilloscope motor input and the star resistance of the midpoint, you can approximate the motor U-back EMF waveform;
3. Depending on the ease of operation, adjust the relative position of the encoder shaft and the motor shaft, or the relative position of the encoder housing and the motor housing;
4. While adjusting, watch the intersection of U and the intersection of signal and rising edge of the intersection of U and signal of the intersection of encoder and U of the intersection of U and electric potential wave of the intersection of electric potential and low from the intersection of zero and high, watch the intersection of rising edge and zero crossing finally, lock the intersection of encoder and relative position, .
Since the conventional incremental encoders do not have UVW phase information and the Z signal only reflects one point within a circle, there is no direct phase alignment potential and is therefore not a topic of discussion.

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