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Product Overview:
The B-402-B-A3 is a brushless rotary resolver designed for harsh industrial environments where optical encoders cannot survive. It provides absolute position feedback at every power-on cycle with no battery backup required.
Technical Specifications:
| Parameter | Value |
|---|---|
| Housing Diameter | 40mm |
| Overall Length | ~55mm (with shaft) |
| Pole Pairs | 2 (360° electrical = 180° mechanical) |
| Excitation Voltage | 4.5–7.0 Vrms, 400 Hz to 10 kHz |
| Excitation Frequency | 2.5 kHz (nominal), 4–10 kHz acceptable |
| Output Signals | Sin θ, Cos θ (analog, ratiometric) |
| Output Amplitude | 0.5–3.6 Vrms (tracks excitation) |
| Accuracy | ±3 arc-min (±0.05°) electrical |
| Linearity | ±0.05% of full scale |
| Operating Speed | 0 to 10,000 RPM (continuous) |
| Shaft Type | Solid shaft, 6mm diameter, D-cut or round (per A3 config) |
| Shaft Length | 20mm (standard) |
| Electrical Connector | M23 8-pin |
| Operating Temperature | -40°C to +125°C |
| Vibration Rating | 30g peak, 10–2000 Hz |
| Shock Rating | 100g, 11ms |
| IP Rating | IP67 (sealed housing) |
| Weight | ~0.18 kg |
| Compliance | CE, UL, RoHS |
Working Principle:
The resolver operates on electromagnetic induction. A rotating rotor with a wound winding is excited by a high-frequency AC signal on the stator. The rotor winding induces Sin θ and Cos θ voltages proportional to the shaft angle. These analog signals are decoded by the servo drive’s resolver-to-digital converter (RDC) to produce absolute position.
Advantages:
- Absolute position at power-on — no homing sequence required
- Operates reliably from -40°C to +125°C — survives extreme environments
- IP67 sealed — immune to dust, water, oil, coolant
- No optical components — immune to contamination that destroys encoders
- 10,000 RPM continuous speed rating
Applicable Industries:
Heavy Machinery (CNC, Mills, Lathes), Mining Equipment, Oil & Gas (downhole), Steel Mills, Marine Propulsion, Wind Turbine Pitch Control
Installation Requirements:
- Mount with 4× M3 screws on 32mm bolt circle
- Maximum shaft misalignment: 0.1mm radial, 0.1° angular
- Excitation and signal cables must be twisted-pair shielded
- Ground shield at drive end only to prevent ground loops
