An encoder is a measuring device used to convert mechanical motion into electrical signals in order to measure position, angle or motion, the most common types of encoders are optical and magnetic, today we are here to answer the concern about the maximum number of magnetic poles in an encoder.
The number of magnetic poles in an encoder depends on the specific encoder design and purpose. For optical encoders the concept of magnetic poles does not apply as they use optical sensors to measure motion. Optical encoders are typically more accurate and are suitable for applications that require high resolution and precision.
Magnetic field diagram of a 128-pole planar magnetised ring magnet
For magnetic encoders, the number of magnetic poles can be several, or dozens or even hundreds, this number of encoders has no fixed upper limit.
In actual application, the common number of magnetic poles for encoders are.
2 poles: this is the simplest encoder, which can detect forward and reverse.
4 poles: this is more common, it can achieve 90 degrees of resolution.
6 poles: This kind of encoder increased resolution, and it can achieve 60 degrees of detection accuracy.
8 poles: 8 pole encoder will continue to improve the resolution to 45 degrees.
16 poles: Highly accurate detection with an angular resolution of 22.5 degrees.
32 poles: This kind of encoder has very high accuracy, with an angular resolution of 11.25 degrees.
60 poles: which has ultra-high resolution, for use in applications that require very precise angular control.
With the increase in the number of magnetic poles, the resolution and detection accuracy of the encoder will continue to improve, but the complexity and cost will also increase, taking into account the cost and practical needs, the general choice of 4-16 poles of the encoder can meet most applications.
This is the answer to the question about the number of magnetic poles in an encoder and some deffirent number magnetic poles of an encoder can accomplish what needs, I hope this article is helpful to you!
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