Absolute magnetic encoders - application, classification and advantages

Absolute magnetic encoders - application, classification and advantages

Absolute magnetic encoders are advanced measuring devices that play a key role in precisely determining the position, speed and direction of movement in industrial machines and systems. Thanks to their reliability, accuracy and resistance to difficult working conditions, they are gaining more and more popularity in various industries. In this post, we will take a closer look at their applications, classification, and advantages.

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What are absolute magnetic encoders?

Absolute magnetic encoders are devices that use a magnetic field to measure angular or linear position. Unlike incremental encoders, absolute encoders provide position information without the need for calibration after each system startup. This makes them ideal for applications that require high precision and reliability.

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Applications of absolute magnetic encoders

Absolute magnetic encoders are used in many industries, including:

1. Machinery industry

They are used in CNC machine tools, industrial robots, and automation systems, where precise position measurement is crucial.

2. Automotive

Used in steering systems, brake systems, and electric and hybrid drive systems.

3. Energy

Used in wind turbines and other systems requiring position and speed monitoring.

4. Medicine

Used in medical devices such as tomographs or surgical robots, where the highest precision is required.

5. Food and pharmaceutical industry

Used in packaging machines, mixing machines and product transport systems.

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Classification of absolute magnetic encoders

Absolute magnetic encoders can be classified based on several criteria:

1. Measurement type

- Rotary encoders - measure the angle of rotation of the shaft.

- Linear encoders - measure linear displacement.

2. Resolution

Encoders differ in resolution, i.e. the number of bits. Higher resolution means greater measurement accuracy.

3. Mounting method

- Shaft encoders – mounted directly on the shaft.

- Hollow-shaft encoders – with a through hole, which makes mounting easier.

4. Ingress protection (IP)

Encoders can be adapted to work in difficult conditions, e.g. in humid, dusty or vibration-prone environments.

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Advantages of absolute magnetic encoders

1. Safety and reliability

Absolute encoders retain position information even after the power is turned off, which eliminates the need for recalibration.

2. Resistance to harsh conditions

Thanks to the use of magnetic technology, these encoders are resistant to vibration, dust, moisture and extreme temperatures.

3. High precision

They provide accurate measurements even at high rotational speeds.

4. Long service life

The lack of mechanical components subject to wear makes magnetic encoders durable and requires minimal maintenance.

5. Flexibility of applications

Available in a variety of versions, these encoders can be tailored to specific application needs.

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How to choose the right absolute magnetic encoder?

The choice of encoder depends on several factors:

1. Application type

Determine whether you need a rotary or linear encoder.

2. Required precision

Choose an encoder with the right resolution and accuracy.

3. Operating conditions

Make sure the encoder has the right IP rating and is resistant to external factors.

4. Mounting method

Choose a shaft or hollow-shaft encoder, depending on your system configuration.

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Summary

Absolute magnetic encoders are indispensable devices in industry that provide precise measurements of position, speed and direction of movement. Their advantages, such as reliability, resistance to harsh conditions and high accuracy, make them an increasingly popular choice among engineers and designers.

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