Incremental encoder electronic commutation signal alignment method introduction

UVW for incremental encoders with commutation signalselectronic transponder signalThe alignment between the phases of the rotor and the phases of the rotor poles, or the electrical angle phases, is as follows:

1. A DC power supply is used to energize the UV windings of the motor with a DC current less than the rated current, U in and V out, to orient the motor shaft to a balanced position;

2. Observe the U-phase signal and Z-signal of the encoder with an oscilloscope;

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 and control;

4, while adjusting, while observing the encoder U believe signal jumping edge, and Z signal, until the Z signal is stable (explanation: solid stability; no change) in the high level, lock the encoder and the motor relative position relationship;

5. Twist the motor shaft back and forth, and after spreading, if the Z signal can be stabilized at high level every time the motor shaft freely returns to the balanced position, then the alignment is valid.

After removing the DC power supply (the device that provides power to the electronic equipment), verify the following:

1. Use an oscilloscope to observe the U-phase signals of the encoder and the UV line counterpotential waveforms of the motor;

2, rotate the motor shaft, the encoder's U letter signal rising edge and the motor's UV line counterpotential waveform from low to high over the zero point of coincidence, the encoder's Z signal also appears in this over the zero point. Encoder installation is installed after the reduction gear, such as the shaft end of the winch wire rope reel or the last section of the reduction gear shaft end, this method has no gear back and forth clearance, the measurement is more direct, higher accuracy, this method is generally measured over long distances for positioning, such as a variety of hoisting equipment, feeding trolley positioning, and so on.

The verification method (method), can also be used as an alignment method. It should be noted that, at this time, the incremental encoder U believe that the zero point of the phase with the motor UV line counter-potential phase zero alignment, due to the motor's U opposite potential, and the UV line counter-potential difference of 30 degrees between, and therefore so aligned, the incremental encoder U believe that the zero point of the phase with the motor U opposite potential -30 degrees phase point alignment, and electromechanical and electrical angle (angle) phase and U Opposite potential waveform (waveform) phase consistent, so at this time the incremental encoder U letter signal phase zero and electromechanical angle phase of the -30 degree point aligned.

Some companies are accustomed to aligning the zero point of the encoder's U-phase signal directly with the zero point of the motor's electro-mechanical angle, which is aligned as follows:

1, with three resistors of equal resistance value connected to a star, and then the star connected to the three resistors were connected to the motor's UVW three-phase winding leads;

2, with an oscilloscope to observe the motor U-phase input and the midpoint of the star resistor, you can approximate the motor's U opposite potential waveform (waveform);

3, according to the ease of operation, adjust the relative position (position ) of the encoder shaft (Shaft) and the motor shaft, or the relative position of the encoder shell and the motor shell;

4, while adjusting, while observing the encoder (coding) U believe the rising edge of the signal and the motor U opposite potential waveform from low to high over the zero point, and finally make the rising edge and over the zero point coincide, lock the encoder and the motor's relative positional relationship, complete the alignment. Absolute encoder is widely used in water conservancy, light industry, machinery, metallurgy, textile, petroleum, aviation, navigation and other industries. Specific to the project category such as: rotary table, gate opening, valve opening, hoist crane positioning, traveling crane positioning, level measurement, missile launch angle positioning, missile air rudder measurement, electronic latitude and longitude and other high-precision measurement and positioning occasions. The signal output of the rope displacement sensor is divided into digital signal output and analog signal output, digital output type can choose incremental rotary encoder, absolute encoder, etc., the output signal is a square wave ABZ signal or Gray code signal, the stroke can be done to a maximum of 10,000 millimeters, linear accuracy of up to 0.01%, according to the different configurations of the resolution of the maximum can be up to 0.001 millimeters / pulse.