Precision-magnetized encoder rings for humanoid robots, servo motors, and industrial automation. Compatible with iC-Haus iC-MU series (absolute/incremental). Full custom diameters (down to 1.0 mm thin), pole pairs (16–128), and ferrite/NdFeB/SmCo materials. Engineering samples in 4 weeks.
Precision-magnetized encoder rings for humanoid robots, servo motors, and industrial automation. Compatible with iC‑Haus iC‑MU series (absolute/incremental) and other leading magnetic encoder ICs.
A typical humanoid robot integrates 30–40 joint modules, and each joint requires a high-performance encoder ring that is compact, accurate, and rugged. The OTV magnetic encoder ring delivers:
- Hollow‑shaft architecture – leaves the center unobstructed for cables
- Ultra‑thin profile – can be as thin as 1.0 mm to fit tight axial spaces
- Absolute positioning – position available instantly after power‑up, no homing sequence required
- Rugged reliability – dust, oil, moisture, shock, and vibration tolerant
| Parameter | Value / Range |
|---|---|
| Pole pairs | 16 to 128 (or custom numbers for specific Nonius ratios) |
| Outer diameter (OD) | Custom, from small diameters upward |
| Inner diameter (ID) | Custom |
| Minimum thickness | 1.0 mm for ultra‑tight joints |
| Magnetic pattern | Dual‑track (absolute + incremental), single‑track, or single‑track with reference mark (missing pole) |
| IC compatibility | iC‑Haus iC‑MU series (pole pitch 1.28 mm, 1.5 mm, 2.0 mm) |
| Resolution (with iC‑MU200) | 18, 19, or 20 bits, depending on master pole pairs |
| Mounting integration | Bond directly to a metal hub, or supplied with a metal carrier |
| Materials | Ferrite rubber (bonded), neodymium‑based rubber compounds, SmCo for high temperature stability |
We supply rings fully optimized for the most widely used absolute encoder chips, including the iC‑Haus iC‑MU series [5†L76-L79]:
| Chip Series | Pole Pitch |
|---|---|
| iC‑MU / iC‑MU (standard) | 1.28 mm |
| iC‑MU150 | 1.5 mm |
| iC‑MU200 | 2.0 mm |
| Model | Master PP | Nonius PP | ID (mm) | OD (mm) | Master Track Dia (mm) | Nonius Track Dia (mm) | Master PW (mm) | Nonius PW (mm) |
|---|---|---|---|---|---|---|---|---|
| A2003200 | 32 | 31 | 25 | 44.5 | 40.8 | 32.8 | 2.0 | 1.66 |
| A2006400 | 64 | 63 | 62 | 85 | 81.5 | 73.5 | 2.0 | 1.83 |
| Model | Master PP | Nonius PP | ID (mm) | OD (mm) | Master Track Dia (mm) | Nonius Track Dia (mm) | Master PW (mm) | Nonius PW (mm) |
|---|---|---|---|---|---|---|---|---|
| A1503200 | 32 | 31 | 18 | 34.5 | 30.6 | 23.4 | 1.5 | 1.34 |
| A1506400 | 64 | 63 | 47.40 | 65.10 | 61.1 | 53.9 | 1.5 | 1.34 |
| Model | Master PP | Nonius PP | ID (mm) | OD (mm) | Master Track Dia (mm) | Nonius Track Dia (mm) | Master PW (mm) | Nonius PW (mm) |
|---|---|---|---|---|---|---|---|---|
| A1286400 | 64 | 63 | 38 | 56 | 52.2 | 45 | 1.28 | 1.12 |
| A1283200 | 32 | 31 | 15 | 29 | 26 | 18.88 | 1.28 | 1.12 |
| Model | Master PP | Nonius PP | ID (mm) | OD (mm) | Master Track Dia (mm) | Nonius Track Dia (mm) | Master PW (°) | Nonius PW (°) |
|---|---|---|---|---|---|---|---|---|
| R1286000 | 32 | 31 | 20 | 24.5 | 4.8 | 1.2 | 5.63 | 5.81 |
| R1503000 | 64 | 63 | 53.1 | 59.6 | 5.8 | 2.2 | 2.81 | 2.86 |
PP = Pole Pairs | PW = Pole Width
The encoder system comprises three main parts:
- Encoder ring – A precision‑formed ring with alternating north and south poles arranged circumferentially
- Sensor chip – A Hall, AMR or TMR sensor IC (such as the iC‑MU series from iC‑Haus) positioned off‑axis, reading the magnetic field emitted by the poles
- Processing electronics – The ASIC converts magnetic flux variation into a digital position
For absolute position measurement, the ring provides two tracks: an incremental track with high‑frequency pole pairs for fine interpolation, and an absolute/Nonius track with a slightly different pole count. The chip reads both tracks, calculates their phase difference, and instantly determines the absolute angular position [8†L7-L16].
OTV Sensing provides full customization for:
- Dimensions – OD, ID, thickness to match your mechanical environment; can be as thin as 1.0 mm
- Pole count – From 16 to 128 pole pairs, or custom numbers for specific Nonius ratios
- Magnetic pattern – Dual‑track (absolute + incremental), single‑track, or single‑track with reference mark (missing pole)
- Mounting integration – Bond directly to metal hub, or supplied with precision‑machined stainless steel carrier with mounting holes or clamping hub
- Materials – Ferrite rubber (bonded), neodymium‑based rubber compounds with enhanced thermal stability, SmCo for high temperature environments [9†L101-L110]
Our quality control process includes:
- ✅ Dimensional sampling inspection
- ✅ 100% magnetic parameter test [9†L111-L117]
| Product Type | Lead Time |
|---|---|
| Standard products (no stock) | 2 weeks after order confirmation |
| Custom design samples | ~4 weeks after design confirmation [11†L137-L144] |
- Standard MOQ – Flexible, negotiable for prototype or trial orders [11†L137-L138]
- Sample building – Generally charged a nominal fee to cover material and setup costs [11†L139-L141]
Fully optimized for the most widely used absolute encoder chips, including:
- iC‑Haus iC‑MU series (pole pitch: 1.28 mm)
- iC‑Haus iC‑MU150 (pole pitch: 1.5 mm)
- iC‑Haus iC‑MU200 (pole pitch: 2.0 mm) [5†L76-L79]
| Master Pole Pairs | Output Resolution |
|---|---|
| 16 | 18 bits |
| 32 | 19 bits |
| 64 | 20 bits [11†L130-L133] |
- Identify your requirements – encoder IC model, desired resolution, mechanical envelope, environmental conditions
- Contact OTV Sensing – provide mechanical drawing, target dimensions, pole pair count, operating temperature, and encoder IC model
- Receive engineering samples – 4 weeks after design confirmation
- Validate – test and approve
- Scale to production – supported from small batches to volume production
Proprietary – contact OTV Sensing for licensing and commercial use.
OTV Precision Sensing
Website: www.otvsensing.com
Custom encoder ring inquiry: www.otvsensing.com/custom-magnetic-encoder-rings/
We are ready to support you from concept through production.