AXRY-MI / MA
Inductive Angle Measuring System — Incremental MI · Absolute MA
Measuring ring mounted directly on the bearing inner ring for maximum angular accuracy
Inductive measuring principle, IP67 protection, immune to magnetic field interference
Incremental MI — Absolute MA
Two measuring solutions, both supporting single-head (axial) and dual-head (radial) configurations
AXRY-MI
Bearings with Incremental Angle Measuring System
Through a purely inductive measuring system, maximum system accuracy of less than ±2μm arc length can be achieved. The system consists of a solid measuring ring with incremental encoding and scanning heads, available for sizes 150 to 650.
Single Scanning Head (Axial)
Scanning head mounted axially above the outer ring. Suitable for general accuracy requirements, simple structure, easy installation. A spacer plate is needed to correctly position the scanning head.
Dual Scanning Head (Radial)
Two scanning heads mounted radially on the outer ring housing surface, positioned 180° apart. Multi-head scanning eliminates eccentricity and radial runout errors for maximum accuracy.
AXRY-MA
Bearings with Absolute Angle Measuring System
Through a purely inductive measuring system, maximum system accuracy of ±1μm arc length can be achieved. Position is known immediately at power-on — no reference run required. The system continuously provides constant absolute position information to the control system.
Single Scanning Head (Axial)
Scanning head mounted axially above the outer ring. Absolute encoding — position is known immediately at power-on, no homing run required.
Dual Scanning Head (Radial)
Scanning heads mounted on the outer ring housing surface. With radial mounting, air gap adjustment is performed via the outer ring OD, eliminating complex measurement gap setup.
| AXRY-MI (Incremental) | AXRY-MA (Absolute) | |
|---|---|---|
| Measuring Principle | Inductive Incremental | Inductive Absolute |
| System Accuracy | ≤ ±2μm arc length | ≤ ±1μm arc length |
| Multi-Head Accuracy | < ±1 arc-second (verified in real applications) | |
| Measuring Ring Height | 10 mm | 14 mm |
| Homing Required | Yes (must traverse reference point) | No (position known at power-on) |
| Scanning Head | Miniature head + external electronics or built-in electronics | Modular head axial or radial mounting |
| Radial Mounting | Supported | Supported (no air gap adjustment needed) |
| Compatible Bearings | AXRY-NGX / AXRY-NGS / AXRY-EX | |
| Size Range | 150 – 650 mm | |
Why Choose Integrated Measurement?
The measuring ring is mounted directly on the bearing inner ring, minimizing eccentricity errors for arc-second level accuracy
Highest System Accuracy
The measuring ring is mounted on the inner ring, running nearly concentric with the shaft (worktable). Multi-head solutions achieve < ±1 arc-second accuracy.
Scanning Heads Without Built-In Bearings
No additional friction or heat sources, enabling maximum hollow shaft diameter. Directly mounted on the outer ring for quick integration into various control systems.
System Accuracy & Total Accuracy
Understanding the key factors affecting measurement accuracy
System Accuracy
The accuracy of the fully assembled angle measuring device mounted only on the AXRY bearing.
- Measuring ring pitch accuracy (±3μm or ±5μm)
- Measuring ring eccentricity error (= inner ring 1/2 radial runout)
- Scanning head interpolation error (IPF-AMO)
Total Accuracy
The accuracy of the fully assembled angle measuring device on the machine axis.
- Shaft deformation (tilting, etc.)
- Shape and dimensional deviations of customer shaft and adjacent structures
- Installation errors
Larger bearing sizes make it easier to achieve high system accuracy. Using multi-head solutions, < ±1 arc-second accuracy has been achieved in real applications. Scanning heads are available with different input frequencies to cover both ultra-precision and high-speed applications.
Technical Documentation Center
Complete selection guides, dimension specifications, and installation instructions
AXRY-MI/MA Overview
Angle measuring system overview, advantages, available systems
Incremental MI
Features, single/dual head configurations, component descriptions
Absolute MA
Features, single/dual head configurations, component descriptions
MI Dimensions
Incremental angle measuring bearing dimension tables
MA Dimensions
Absolute angle measuring bearing dimension tables
Ordering Information
Model naming conventions, ordering notes
Explore Angle Measurement Technology
Complete product specifications, installation instructions, and selection guides are available in the Technical Documentation Center.