Introduction
BEI Sensors DHM5 Series Hollow-shaft, built on a solid, reliable mechanical and electrical platform, was designed from the ground up for reliability and robustness. Electrical protection is built in to reduce “first installation” errors. Mechanically, the high-precision sealed bearings mean long life, even in harsh conditions. The product is tested and rated to operate from -40°C to +100°C in extreme environments. This is the best all-around encoder in a 58mm package for heavy-duty industrial use.
Features
DHM5 Rotary Incremental Encoder :
• Robustness and excellent resistance to shocks/vibrations
• High Protection Level IP65, IP67 Option with a Sealing Flange
• High Resolutions Available: Up to 500 000 ppr
• Universal Electronic Circuits from 4.75 to 30 Vdc
• High Performance in Temperatures –40°C to 100°C
• High bandwidth: Up to 1MHz
Applications
• Factory automation
• Motor feedback
• Conveyors
• Automated warehousing
• General industrial system monitoring and feedback
Mechanical Specifications
| Parameter | DHM5 | DHK5 | DHO5 |
| Material – Cover | Zinc Alloy | ||
| Material – Body | Aluminum | ||
| Material – Shaft | Stainless Steel | ||
| Bearings | 6000 Series | 6803 Series | |
| Max Load – Axial | 50 N | 20 N | |
| Max Load – Radial | 100 N | 50 N | |
| Shaft Inertia | 2.5×10⁻⁶ kg·m² (10mm) | 2.9×10⁻⁶ kg·m² (14mm) | 3.2×10⁻⁶ kg·m² (14mm) |
| Torque | 4×10⁻³ N·m | 16×10⁻³ N·m | 20×10⁻³ N·m |
| Permissible Max. Speed | 12 000 min⁻¹ | 6 000 min⁻¹ | |
| Continuous Max. Speed | 10 000 min⁻¹ | 6 000 min⁻¹ | |
| Encoder Weight (Approx.) | 0.300 kg | ||
| Theoretical Mechanical Lifetime 10⁹ turns (Faxial / Fradial) | 30 N / 60 N: 26 | 20 N / 40 N: >36 | |
Electrical Specifications
(1) See the resolutions section for details. (2) Surface encoder temperature. (3) UL Listed: –20°C to +80°C. Device must be supplied by a Class 2, LPS or SELV limited energy source 250mA.
| Ver. | Output Signals | Operating Voltage +V | Supply Current (no loads) | Current per Channel Pair | Short Circuit Proof | Reverse Polarity Tolerant | Frequency Capability | Operating Temp. Range |
| RG5 | HTL | 4.75–30V | <75mA | <40mA | Yes | Yes | Up to 1MHz | –40°C to +100°C / –40°C to +80°C (High) |
| RGX | HTL/TTL selectable | 4.75–30V | <75mA | <40mA | Yes | Yes | Up to 1MHz | –40°C to +100°C / –40°C to +80°C (Multiplier prog.) |
| 5GT | HTL + CTP | 11–30V | <75mA | <40mA | Yes | Yes | Up to 300kHz | –40°C to +80°C |
| RG2 | TTL | 4.75–30V | <75mA | <40mA | Yes (Except to +V) | Yes | Up to 1MHz | –40°C to +100°C / –40°C to +80°C (High) |
| 2G2 | TTL | 5V ±5% | <75mA | <40mA | Yes | Yes | Up to 1MHz | –40°C to +100°C / –40°C to +80°C (High) |
| 2WT | 1Vpp | 5V ±5% | <75mA | <8mA | Yes | Yes | Up to 300kHz | –40°C to +100°C (Sine wave) |
| RWT | 1Vpp | 4.75–30V | <75mA | <8mA | Yes (Except to +V) | Yes | Up to 300kHz | –40°C to +100°C (Sine wave) |
Environmental Specifications
| Parameter | Value |
| Shocks (EN 60068-2-27) | ≤ 500 m·s⁻² (during 6 ms) |
| Vibrations (EN 60068-2-6) | ≤ 200 m·s⁻² (10…2000 Hz) |
| EMC | EN 61000-6-2, EN 61000-6-4 |
| Isolation | 1 000V eff |
| Operating Temperature | See Electrical table |
| Storage Temperature | –40°C to +100°C |
| Protection (EN 60529) | IP 65 |
| Humidity | 98% RH non-condensing at 20°C |
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