Magnetic Pot Core Coils for Metal Detectors & Proximity Switches
Publish Time: 2025-06-27 Origin: Site
Magnetic Pot Core Coils for Metal Detectors & Proximity Switches
– Golden Eagle’ Precision Solutions
1. Technology Overview
Magnetic pot core coils (shielded inductors) are optimized for high-sensitivity metal detection and non-contact switching, featuring:
Closed magnetic path → 5x lower EMI than unshielded coils
Adjustable inductance (1mH–100mH) via gap tuning
Operating frequencies: 10kHz–500kHz (LF/HF compatible)
Key Parameters:
| Property | Specification | Advantage |
|---|---|---|
| Q Factor | 50–200 @20kHz | High signal-to-noise ratio |
| Temperature Stability | ±30ppm/°C | Reliable in -40°C to +125°C |
| Core Material | Mn-Zn/Ni-Zn ferrite | Custom μ-values (500–15,000) |
2. Metal Detector Applications
✅ Industrial Proximity Sensors
Detects ferrous/non-ferrous metals at 1–30mm distances
Example: Conveyor belt metal contaminant detection
✅ Security Systems
Walk-through gates (100kHz–25MHz operation)
Goden Eagle’s innovation: Auto-tuning coils for humidity resistance
✅ Automotive Position Sensing
Gearbox tooth counting (0.1mm resolution)
AEC-Q200 Grade 1 compliant designs
3. Proximity Switch Solutions
Type Comparison:
| Inductive | Capacitive | Magnetic | |
|---|---|---|---|
| Detection | Metals only | All materials | Ferrous metals |
| Range | 2–40mm | 1–20mm | 5–100mm |
| Golden Eagle’s Coil | Pot core (10mH) | N/A | Reed switch alternative |
Case Study:
Replaced reed switches in elevator door sensors with pot core coils:
▶ 50% longer lifespan (10M+ cycles)
▶ IP68-rated for harsh environments
4. Golden Eagle’ Capabilities
✔ Custom Designs:
Shielded/non-shielded configurations
Litz wire for high-frequency (>100kHz) models
✔ Quality Assurance:
100% automated LCR testing
IEC 60947-5-2 (proximity switch standard) compliance