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Rotary encoder adjustment method - Absolute value rotary encoder adjustment

Article Source:m.888336.cn  Edit:Soundwell  issuing time:2016-05-13

  Absolute rotary encoders phase alignment for single and multi-turn, it is not very different, in fact, are phase aligned in a circle with a phase detection encoder Motor angles. Early absolute rotary encoder will be given a separate pin lap phase of the highest bit level, with this level of inverted 0 and 1, can also achieve the phase encoder and motor alignment, the absolute value of the rotation encoder adjustment method is as follows:
  1. Use a DC power supply to the motor winding through a UV less than the rated current of DC, U into, V out, the motor shaft will be directed to a position of equilibrium;
  2. Using an oscilloscope to observe the highest absolute encoder count bit-level signal;
  3. Adjust the relative position of the encoder shaft and the motor shaft;
  4. The side adjustment, while observing the highest count signal transitions along until the transition occurs at a position along the exact orientation of the balance of the motor shaft,
  Locking relative positional relationship between the encoder and the motor;
  5. The motor shaft twisting back and forth, after doing nothing, if the motor shaft when replying to every free equilibrium position, Edge can be accurately reproduced, the effective alignment.
  Such absolute rotary encoder has been used EnDAT, BiSS, Hiperface and other serial protocols, as well as Japanese special serial protocols new absolute rotary encoders widely replace, and thus the highest signal to discrepancies exist, this time aligned coding motor phase and method have also changed, including a very practical approach is to use an encoder internal EEPROM, random memory encoder mounted on the motor shaft phase is measured, as follows:
  1. The random encoder mounted on the motor, that is the consolidation encoder shaft and motor shaft and encoder housing and the motor housing;
  2. Use a DC power supply to the motor winding through a UV less than the rated current of DC, U into, V out, the motor shaft will be directed to a position of equilibrium;
  3. The servo drive reads lap absolute encoder position value, and internal records stored in the encoder Motor initial phase angle of the EEPROM;      
  4. Align the end of the process.
  Since this time the motor shaft is oriented in the direction of 30 degrees electrical angle phase, the position detection value stored in the internal EEPROM of the encoder corresponds Motor phase angle of -30 degrees. Thereafter, the drive will lap position detection data at any time and do this stored value difference, and the necessary number of pole pairs of the motor conversion, plus 30 degrees, you can get Motor phase angle of the moment.
  This alignment requires the encoder and servo drives support and cooperation will be achieved, Japanese servo encoder phasing reason is not easy to direct the end user to adjust the fundamental reason is that the user refuses to provide such alignment features and interface methods of operation. One big advantage of this alignment method is simply to provide directional rotor current determining phase sequence and direction to the motor winding, without adjusting the angular relationship between the encoder and the motor shaft, so that the encoder can be installed directly in an arbitrary initial angle on the motor, and without fine, or even a simple adjustment process, simple operation, good technology.
  If the absolute value rotary encoder neither available for use EEPROM, nor for detecting the highest count bit pin, the alignment method is relatively complicated. If the drive supports read-out single turn absolute position information and display, you might consider:
  1. Use a DC power supply to the motor winding through a UV less than the rated current of DC, U into, V out, the motor shaft will be directed to a position of equilibrium;
  2. The use of servo drives read and display lap absolute encoder position value;
  3. Adjust the relative position of the encoder shaft and the motor shaft;
  4. After these adjustments, the single-turn absolute position value displayed sufficiently close in accordance with the number of motor pole pairs are translated out of the motor 30 degrees electrical angle corresponding to the absolute position of the lap point response, lock relative positional relationship between the encoder and motor ;
  5. The motor shaft twisting back and forth, after doing nothing, if the motor shaft when replying to every free equilibrium position, the position of said conversion point can be accurately reproduced, the effective alignment.
  Even if the absolute value of the user information is not available, then it can only be by means of special tooling factory, while detecting the absolute position detection value, while phase angle detection Motor using tooling, adjusting the relative angular positional relationship between the encoder and the motor will Motor encoder phase angle and phase aligned with each other, and then locked. As a result, the user is even more impossible to solve its own encoder phase alignment problem.

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