Jul 14, 2023
How do encoders accurately measure the position of a motor?
Measuring the position of the motor generally means measuring the angular position of the motor, i.e. the first few degrees of rotation since the start of the machine. Now because of the popularity of domestic encoders absolute encoders cost less to use, generally measuring the position of the motor will choose absolute encoders. Absolute encoders compared to incremental encoders are mainly in the power on without the need to find zero, power off can be remembered, will not produce cumulative error. If you do not understand, you can study the absolute encoder code plate. If you want to know about encoders, you can go to the Hornblower website, where there are professional engineers who can exchange ideas.
Absolute encoder output types can be broadly divided into analog and digital signals, most now come with their own digital module, which can save some cost of use, the choice of output type is not repeated under this topic. The number of turns is calculated by the gear set and the single-turn position is reflected on the code plate. For perpetual rotation in one direction, a single-turn encoder is selected and the number of turns is added up in the program. How accurately the encoder measures the position of the motor lies in how much the encoder code plate reads. The commonly used encoder code plate is 12 bits, i.e. 4096 quarters per revolution, these quarters is different from the pulse resolution of the pulse encoder, each quarter per revolution of the absolute encoder is a unique position, the angle of rotation is converted into an analog or digital quantity by the encoder integration signal and sent to the host computer.
Encoders occupy an extremely important position in lifts, machine tools, material processing, motor feedback systems as well as in measuring and control equipment. Encoders use grating and infra-red light sources to convert the optical signal into an electrical signal in TTL (HTL) via a receiver. By analyzing the TTL level frequency Q and the number of high levels, the angle of rotation and the rotational position of the motor is visualized.
As both angle and position can be measured precisely, the encoder and inverter can be formed into a closed-loop control system9, making control even more precise, which is why lifts, machine tools, etc. can be used so precisely.
In summary, we understand that encoders are divided by structure into incremental and absolute types, both of which also convert other signals, such as optical signals, into electrical signals that can be analyzed and controlled. The common lifts and machine tools in our lives all happen to be based on the precise adjustment of the motor, which is controlled by feedback closed-loop of the electrical signal, and it is only logical that encoders with frequency converters achieve precise control.
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