Permanent Magnetic Encoder Magnets

What Are Magnetic Encoder Magnets?

Magnetic encoder magnets are key functional components used in encoder systems to convert rotary or linear motion into position, speed, and direction signals. In a typical system, a magnetic ring or magnetic scale works together with a sensor to provide non-contact feedback for motion control and measurement. This structure is widely used in industrial automation because it supports compact design, durable operation, and reliable signal generation in environments where optical systems may be less suitable. RLS, ELGO, and other established suppliers all position magnetic rings and magnetic scales as robust solutions for harsh working conditions and precision feedback applications.

At SDM Magnetics, we specialize in the research, development, and production of magnetic encoder products and components. Our encoder magnets are suitable for both rotary and linear measurement systems and can be customized according to coding scheme, pole pitch, dimensions, and installation requirements. Whether the application requires equally spaced incremental magnetic gratings or programmable absolute-value magnetic coding, we can support application-oriented encoder magnet solutions.

Designed for Harsh Industrial Environments

One of the biggest advantages of magnetic encoder technology is its ability to operate reliably in environments affected by dirt, dust, moisture, vibration, oil, and coolant. Public supplier pages consistently emphasize this point. ELGO describes magnetic rings as a wear-free, space-saving alternative to optical rotary encoders that is insensitive to dirt, dust, liquids, and vibrations, while RLS positions its magnetic rings and scales for harsh environments and tough machine tool applications. Renishaw also highlights the contamination challenges found in machine tool environments, including metal swarf, oil, and coolant.

For customers building industrial equipment, this means magnetic encoder magnets can provide stable feedback performance with lower maintenance risk in real-world operating conditions. This is especially valuable in machine tools, elevators, automation systems, and heavy-duty rotary or linear motion platforms.

Incremental and Absolute Coding Options

SDM permanent magnetic encoder magnets can be developed for both incremental and absolute measurement systems. Incremental magnetic patterns are commonly used for high-speed position and speed feedback, while absolute magnetic coding is used where the exact position must be known immediately, even after power interruption and restart.

This is also consistent with leading market solutions. RLS offers incremental magnetic scales and rings with alternating magnetic poles and optional reference marks, while its Nonius absolute magnetic rings use different pole lengths and magnetic periods to support absolute position measurement. Baumer similarly identifies magnetic ring solutions for incremental, incremental with zero pulse, and absolute measurement requirements.

For your product positioning, this makes it easy to present SDM as a supplier capable of supporting:

• Incremental N/S coding

• Reference-mark solutions

• Absolute magnetic coding

• Unequal-spacing programmable magnetic gratings

• Circular and linear encoder magnet structures

Encoder Ring and Magnetic Scale Formats

Magnetic encoder products are available in multiple forms depending on the application. Common formats include radial or axial magnetic rings, flexible or rigid magnetic scales, outer circumferential magnetic rings, and application-specific encoder magnet assemblies.

Public competitor pages show very similar product structures. RLS magnetic scales use a stainless steel carrier with elastomer-bonded ferrite and are magnetized with alternating poles such as 2 mm, 2.032 mm, or 5 mm. Its magnetic rings use elastoferrite layers bonded to steel or stainless steel hubs, with optional reference marks and compatibility with high-speed and precision encoder systems.

At SDM Magnetics, available product directions include:

• Incremental magnetic scales for machine tools

• Programmable absolute magnetic scales with unequal spacing for elevators

• Circular magnetic rings for precision rotary measurement

• Large-scale outer circumferential magnetic rings for machine tools

• Custom encoder rings and strip-based magnetic scale solutions

Typical Applications

SDM Magnetics provides permanent magnetic encoder magnets, encoder rings, and magnetic scales for non-contact position, speed, and direction feedback. Our solutions support incremental and absolute coding for machine tools, elevators, medical systems, and other industrial motion-control applications.

Incremental Magnetic Scales for Machine Tools

Programmable Absolute Magnetic Scales for Elevators

Circular Magnetic Encoder Rings for Medical CT Systems

Large-Diameter Outer-Circumference Magnetic Rings for Machine Tools

Why Choose SDM Magnetic Encoder Magnets?

SDM Magnetics offers more than standard magnetic strips or rings. We focus on encoder magnet solutions matched to actual customer applications, whether the project requires machine-tool scale feedback, elevator absolute coding, medical rotary positioning, or large circumferential encoder rings.

Key advantages include:

• Non-contact magnetic encoder solutions

• Incremental and absolute coding support

• Ferrite rubber and stainless steel composite structures

• Custom pole pitch and coding options

• Suitable for dirty, humid, and vibration-prone environments

• Linear and rotary encoder magnet development capability

• OEM/ODM support for encoder components and assemblies

Contact Us for Custom Encoder Magnet Solutions

If you are looking for permanent magnetic encoder magnets, encoder rings, or magnetic scales for a motion-feedback application, SDM Magnetics can support your project with customized coding, dimensions, and structure design. Send us your drawing, pole pitch requirement, measurement type, and application environment, and our engineering team will recommend a suitable encoder magnet solution.

FAQ

What are magnetic encoder magnets used for?

Magnetic encoder magnets are used in encoder systems to detect and convert position, speed, or direction into electrical signals for motion control and measurement. They are widely used in industrial automation, machine tools, elevators, and precision equipment.

What is the difference between incremental and absolute magnetic coding?

Incremental coding provides relative motion feedback and typically uses alternating pole patterns with optional reference marks. Absolute coding provides a unique position value at every location, allowing the system to know position immediately after power-up.

Why are magnetic encoders suitable for harsh environments?

Because they use non-contact magnetic sensing, they are generally more tolerant of dirt, dust, moisture, vibration, and coolant than many optical systems. This makes them suitable for industrial and heavy-duty applications.

Can SDM provide custom magnetic encoder rings and scales?

Yes. SDM Magnetics can support custom coding schemes, pole pitch, dimensions, and structural formats for both linear and rotary encoder magnet applications.

What applications are suitable for SDM encoder magnets?

They are suitable for machine tools, elevators, medical systems, automation equipment, and other applications requiring reliable rotary or linear motion feedback.