Normally servo motor encoder has absolute value encoder and two kinds of relative encoder, absolute encoder can keep power, as long as the battery has electricity, is not to need to find the origin;
As will be lost when the power motor more and relatively encoder circle number, so need to find the origin.
Relative servo motor in the process of searching the origin of the encoder needs a external sensors to match action, when external sensors detect block, find the origin position servo motor from origin zin high-speed switch to find the origin at low speed, when the motor running external sensors after the falling edge, servo motor rotational Z to the encoder output points, but there are a few points is important to note: 1.
If the back of the servo motor encoder fixed firmly, Z pulse point is fixed, and finds the origin is very precise servo
Servo motor for the origin, there are many ways of need on the basis of field devices to determine the motor in the process of each direction;
Origin precision does not depend on the precision of the external sensors, as long as the external sensors is not loose, servo motor should be very accurate to find the origin;
In general servo motor find the origin of the purpose is to match the controller position within the current actual location, so many servo motor for the origin finally stop position is not zero.
Zero position, there will be a little deviation, this deviation does not mean to find the origin position error, but because the actual position is with the controller internal position matching complete, there is no need for precise to the origin.
Servo motor is how origin?
Be sure to find the origin (one direction
This is suitable for rotary class)
Determine a direction, to find the limit of one do the origin.
Can write their own this kind of program in PLC, motion control card has this way of back to zero)
Sure in one direction, look for the end of the limit, and then reverse back to the origin.
You of the movement, mostly in this way back to zero.
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