KUBLER incremental encoder

Because our company has its own companies in Germany and the United States, specializing in the import trade industry, our technical personnel will take turns to learn technology from foreign manufacturers. The following is an introduction from our technical personnel to everyone

The KUBLER incremental encoder from Germany converts displacement into periodic electrical signals

An encoder is a device that converts angular or linear displacement into electrical signals. The former is called a code wheel, and the latter is called a code ruler. According to the reading method, encoders can be divided into two types: contact and non-contact. Contact encoders use electric brushes to output, and the state of the code is represented by whether the electric brush contacts the conductive or insulating area to indicate whether it is "1" or "0"; The non-contact receiving sensitive element is a photosensitive element or a magnetic sensitive element. When using a photosensitive element, the state of the code is represented by a transparent area and a non transparent area to indicate whether it is "1" or "0".

According to the working principle, encoders can be divided into two categories: incremental and absolute.

An incremental encoder converts displacement into a periodic electrical signal, which is then converted into count pulses to represent the magnitude of displacement in terms of the number of pulses.

Each position of the absolute encoder corresponds to a specific digital code, so its indication is only related to the starting and ending positions of the measurement, and not to the intermediate process of the measurement.

rotateKUBLER incremental encoderOutput pulses during rotation, and determine its position through a counting device. When the encoder is stationary or powered off, rely on the internal memory of the counting device to remember its position. In this way, when there is a power outage, the encoder cannot move in any way. When there is a power outage, there should be no interference or loss of pulses during the encoder output process. Otherwise, the zero point remembered by the counting device will shift, and the amount of this shift is unknown, only after the occurrence of erroneous production results can it be known.

The solution is to increase the reference point, and the encoder will correct the reference position into the memory position of the counting device every time it passes through the reference point. Before the reference point, the accuracy of the position cannot be guaranteed. For this reason, in industrial control, there are methods such as finding a reference point before each operation and finding the change when starting up.

For example, the positioning of a printer scanner is usedKUBLER incremental encoderPrinciple: Every time we turn it on, we can hear a crackling sound as it searches for the reference zero point before it starts working.

When the incremental encoder shaft rotates, there is a corresponding pulse output, and the discrimination of its rotation direction and the increase or decrease of the number of pulses are achieved through the direction determining circuit and counter at the rear. Its counting starting point can be set arbitrarily, allowing for infinite accumulation and measurement over multiple cycles. The Z signal, which emits one pulse per revolution, can also be used as a reference mechanical zero position. One revolution of the encoder shaft will output a fixed number of pulses, which are determined by the number of lines in the encoder grating. When it is necessary to improve the resolution, the A and B signals with a 90 degree phase difference can be used to multiply the original pulse number, or the high-resolution encoder can be replaced.

The working principle of incremental angle digital encoder:

(The image text is: light source, code wheel, photosensitive element, amplification and shaping, pulse output)

On the edge of a code wheel, there are equal angle gaps (divided into transparent and opaque parts), and light sources and photosensitive elements are installed on both sides of the slotted code wheel. When the encoder rotates along with the working axis, a change in light intensity occurs every time it passes through a gap. After being shaped and amplified, an electrical pulse output signal with a certain amplitude and power can be obtained, and the number of pulses is equal to the number of gaps that have been rotated. Send the pulse signal to the counter for counting, and the angle of rotation of the encoder can be determined from the measured digital number.

To determine the direction of rotation, two sets of photoelectric conversion devices can be used. Make them have a certain relative position in space, so as to ensure that the signals they generate have a phase difference of 1/4 cycle.