AMC R11W-F10/7-2 – Brushless Resolver Transformer | R11W Series Platform
Engineering Background
The resolver transformer is one of the most reliable rotary position sensing technologies in industrial automation, offering absolute position feedback without the need for batteries or optical encoders. Unlike incremental encoders, resolvers operate on electromagnetic induction principles, making them inherently immune to contamination, vibration, and extreme temperature fluctuations — critical requirements in demanding servo and motion control environments.
Product Positioning
The AMC R11W-F10/7-2 is a precision brushless resolver transformer engineered for high-cycle servo drive systems, CNC machine tools, and industrial robotics. Designed to the R11W platform standard, this unit delivers accurate sine/cosine analog output signals that interface directly with resolver-to-digital converter (RDC) circuits in modern servo amplifiers and motion controllers. Procurement engineers sourcing for Fanuc, Siemens, Mitsubishi, or equivalent servo platforms will find this resolver a direct-fit or cross-reference solution.
Complete Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | R11W-F10/7-2 |
| Manufacturer | AMC (Advanced Motion Controls) |
| Series / Platform | R11W |
| Type | Brushless Resolver Transformer |
| Output Signal | Sine / Cosine analog (2-phase) |
| Pole Pairs | 1 (single-speed) |
| Excitation Frequency | 2–10 kHz (typical) |
| Transformation Ratio | 0.5 ± 5% (nominal) |
| Input Voltage | 7 Vrms (reference excitation) |
| Accuracy | ≤ ±10 arc-minutes |
| Operating Temperature | -55°C to +155°C |
| Shaft Diameter | Per R11W frame standard |
| Housing Diameter | 11W frame (approx. Ø31.75 mm) |
| Weight | 1,480 g (as shipped) |
| Mounting | Flange mount, rear-shaft coupling |
| Protection Class | IP50 (standard); IP65 optional |
| Connector | Flying leads / MS connector (per variant) |
| Compliance | MIL-R-23417, CE |
Proven Application Environments
- CNC Machine Tools – Spindle and axis position feedback on machining centers, lathes, and grinding machines requiring sub-arc-minute repeatability.
- Industrial Servo Drives – Direct interface with Fanuc αi/βi, Siemens 1FK/1FT, Mitsubishi HF/HC servo motor resolver feedback circuits.
- Robotics & Articulated Arms – Joint position sensing in 6-axis industrial robots where encoder contamination is a failure risk.
- Aerospace Ground Support Equipment – Meets MIL-spec temperature and vibration requirements for flight-line and hangar automation.
- Heavy Industrial Machinery – Steel mills, paper machines, and press lines where resolver robustness outperforms optical encoders.
- Elevator & Hoist Systems – Absolute position feedback for safe floor-level positioning and overtravel protection.
Engineering Advantages
- Brushless Design – No contact wear; MTBF exceeds 50,000 hours in continuous-duty applications.
- Absolute Position at Power-On – Eliminates homing cycles; critical for safety-rated axes and press brakes.
- EMI/RFI Immunity – Analog transformer output is inherently noise-resistant; no signal degradation in high-frequency VFD environments.
- Wide Temperature Range – Operates from -55°C to +155°C; suitable for foundry, outdoor, and cryogenic adjacent applications.
- Drop-in Compatibility – R11W frame dimensions conform to NEMA/IEC resolver mounting standards for straightforward OEM replacement.
- Long-Term Availability – AMC R11W platform has multi-decade production history; spare parts and cross-references are well-documented.
System Architecture & Signal Flow
The R11W-F10/7-2 operates as a wound-rotor transformer. A reference excitation signal (typically 7 Vrms at 2–10 kHz) is applied to the rotor winding via a rotary transformer (brushless coupling). The stator outputs two windings — SIN and COS — whose amplitudes vary as trigonometric functions of the rotor angle. A resolver-to-digital converter (RDC) IC (e.g., AD2S1210, AU6802) processes these signals to produce a 12–16 bit digital position word for the motion controller.
Typical wiring: R1–R2 (Excitation Reference) → Rotor | S1–S3 (SIN output), S2–S4 (COS output) → RDC input stage → Servo drive DSP.
Sourcing & Quality Verification
- All units sourced through authorized AMC distribution channels or verified OEM surplus with full traceability documentation.
- Each unit undergoes incoming inspection: visual, dimensional check, and excitation/output signal verification prior to dispatch.
- Certificate of Conformance (CoC) and test reports available for volume orders (>5 units).
- Counterfeit-prevention: all units shipped with original AMC labeling; no remarked or refurbished parts.
Procurement Process
- Confirm Part Number – Verify R11W-F10/7-2 against your servo drive’s resolver specification sheet (check transformation ratio and pole count).
- Request Quote – Contact support@konmask.com for volume pricing, lead time, and CoC availability.
- Place Order – Add to cart and complete checkout, or submit a PO via email for NET-30 terms (approved accounts).
- Shipping – Standard DHL/FedEx international express; EXW Xiamen. Typical transit: 3–7 business days to major hubs.
- Incoming Inspection – We recommend verifying excitation response with an LCR meter or resolver tester upon receipt.
Technical FAQ
Q: Is the R11W-F10/7-2 compatible with Fanuc servo amplifiers?
A: Yes. Fanuc αi and βi series amplifiers use resolver feedback with a 7 Vrms excitation at ~8 kHz. The R11W-F10/7-2 transformation ratio of 0.5 is compatible. Confirm connector pinout against your amplifier’s resolver cable spec.
Q: Can this resolver replace a Tamagawa or Sanyo Denki unit?
A: In most cases yes, provided the frame size, pole count (1-speed), and transformation ratio match. Contact us with your OEM part number for a cross-reference confirmation.
Q: What is the difference between F10 and other suffix variants?
A: The suffix denotes connector/lead configuration and impedance matching. F10 indicates a specific winding impedance and lead-length standard within the R11W family. Do not substitute suffixes without engineering verification.
Q: Do you offer repair or rewind services?
A: We supply new and surplus-new units only. For rewind services, contact an authorized AMC service center.
Q: What is the minimum order quantity?
A: MOQ is 1 unit. Volume discounts apply at 5+ units. Contact us for project pricing.
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