Phase alignment way of servo motor sine cosine encoder

Servo motor is phase alignment of cosine encoder is as follows:

1. With a dc power supply to the motor windings of UV flux to less than the rated current of dc, U, V, and the motor shaft orientation to an equilibrium position;

2. Use the oscilloscope observation is C of cosine encoder signal waveform;

3. Adjust the relative position of encoder shaft and motor shaft;

4. Adjustment, while observing C signal waveform, until the passing zero from low to high accuracy in the motor shaft orientation equilibrium position, locking motor encoder and the relative position relations;

5. Turn the motor shaft, back and forth after, if the motor shaft every time free to return to balance position, can accurate emersion passing zero, effective alignment.

After removal of dc power supply, verify the following:

1. Use the oscilloscope to observe motor encoder C # believe and UV line back emf waveform;

2. Turn the motor shaft, the encoder C # believe from low to high passing zero and motor UV line back emf waveform from low to high passing zero overlap.

At this point C signal passing zero and electrical mechanical and electrical Angle phase aligned to 30 degrees.

If you want to directly and Angle of the motor was zero point alignment, can consider to:

Equal in three resistances into a star, and then the three resistance of star join separately UVW three-phase winding wire connected to the motor;

2. With the oscilloscope to observe motor U phase input to the halfway point of the star resistance, can approximate get U instead of the motor electric potential waveform;

3. Adjust the relative position of encoder shaft and motor shaft;

4. Adjustment, while observing the encoder C # believe from low to high U instead of passing zero and motor voltage waveform from low to high passing zero, finally make two zero overlap, locking relationship between encoder and the relative position of the motor, complete alignment.

As ordinary cosine encoder has no phase information within a circle, and the Index can only reflect the signal of a point, do not have direct phase alignment potential, thus at this as a topic for discussion.

If can access is cosine encoder servo drive can provide users with a single retrieved from C and D ring absolute position information, you can consider:

1. With a dc power supply to the motor windings of UV flux to less than the rated current of dc, U, V, and the motor shaft orientation to an equilibrium position;

2. The use of servo drives read and display the signal from the C, D in single ring absolute position information;

3. Adjust the spin axis and the relative position of the motor shaft;

4. After the adjustment, make show fully close to absolute position according to motor of logarithm conversion out - 30 degrees electric Angle should deal with the absolute position of points, locking relationship between encoder and the relative position of the motor;

5. Turn the motor shaft, back and forth after, if every time the motor shaft free to return to balance position, can accurate emersion the convert absolute position point, aligned is effective.

After the removal of dc power supply, can then get aligned with essentially the same in front of the validation effect:

In the oscilloscope observation is C # believe and motor of cosine encoder UV line back emf waveform;

2. Turn the motor shaft, verify the encoder C # believe from low to high passing zero and motor UV line back emf waveform from low to high passing zero overlap.

If use drive internal nonvolatile memory such as block of EEPROM, can also be stored are random cosine encoder installed on the motor shaft after the measured phase, specific methods are as follows:

1. Will is cosine random installed on the machine, which consolidated the encoder shaft and motor shaft, as well as the encoder housing and motor shell;

2. With a dc power supply to the motor windings of UV flux to less than the rated current of dc, U, V, and the motor shaft orientation to an equilibrium position;

3. With servo drives read by C, D signal to parse out lap absolute position values, to drive internal records electric block and phase Angle of the initial installation of EEPROM, etc in the nonvolatile memory;

4. The alignment process is over.

Because the motor shaft has been directed in direction of electricity - phase from the Angle of 30 degrees, so deposited in the block drives the internal EEPROM and other nonvolatile memory location detection value of the corresponding phase Angle of the motor - thirty degrees. Since then, the drive will at any time by the encoder resolution of lap absolute position related to electrical Angle value with the stored value difference, and according to the motor of logarithmic necessary conversion, plus - 30 degrees, you can get the motor Angle phase of the moment.

The alignment requires a servo drive at home and give support and cooperation to achieve on the operation, and because the record motor block initial phase Angle of EEPROM and other nonvolatile memory in servo driver, therefore, once the alignment, motors and drives binding, in fact, if need to replace the motor, is cosine encoder, or drive, all need to initial installation phase alignment operation, supportive relationship and rebinding motor and drives.