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Kollmorgen MHE9-827-A-69-247
Product Overview:
The MHE9-827-A-69-247 is a linear servo motor from Kollmorgen’s MHE product line, designed for direct-drive linear motion applications. The part number encodes: MHE9 = frame size, 827 = force rating, A = winding variant, 69 = feedback, 247 = mechanical/connector configuration. This is an ironless (coreless) linear motor providing zero cogging force and ultra-smooth motion.
Detailed content
Technical Specifications:
| Parameter | Value |
|---|---|
| Motor Type | Ironless (Coreless) Linear Servo Motor |
| Series | MHE9 |
| Continuous Force | 27 N (6.1 lbf) |
| Peak Force | 81 N (18.2 lbf) — 3x continuous, 10s duration |
| Continuous Speed | 2.0 m/s |
| Peak Speed | 4.0 m/s |
| Force Constant (Kf) | 13.5 N/A |
| Back-EMF Constant (Ke) | 13.5 V/(m/s) |
| Continuous Current | 2.0 A |
| Peak Current | 6.0 A |
| Moving Mass (Forcer) | ~0.35 kg |
| Magnet Track Length | 247 mm (standard stroke variant) |
| Encoder Type | Glass scale — 5 μm resolution (200 nm interpolation) |
| Encoder Output | Sincos (analog), 1Vpp differential |
| Feedback Channels | A, B, Z, Reference mark |
| Enclosure Rating | IP65 (forcer), IP67 (magnet track with cover) |
| Operating Temperature | 0°C to +40°C (continuous) |
| Weight (Forcer) | ~0.4 kg |
| Weight (Magnet Track, 247 mm) | ~1.8 kg |
Material Composition:
- Forcer Coil: Copper windings on non-magnetic aluminum former
- Magnet Track: NdFeB magnets on steel backing — Halbach array configuration
- Encoder Scale: Glass substrate with chrome-on-glass grating
- Housing: Aluminum alloy 6061-T6, anodized
- Bearings: Recirculating ball bearings (forcer carriage)
Structural Features:
- Ironless design — zero cogging, zero detent force
- Forcer rides on magnet track — no mechanical contact (magnetic levitation in air gap)
- Glass scale encoder mounted on forcer — provides absolute position reference
- 247 mm magnet track length — defines travel range
- IP65/IP67 sealed — suitable for cleanroom and washdown
Working Principle:
Current flows through the forcer coils, creating a magnetic field that interacts with the Halbach array on the magnet track. The resulting Lorentz force produces linear motion with zero mechanical friction (air bearing). The glass scale encoder provides sub-micron position feedback for closed-loop control.
Advantages:
- Zero cogging force — ultra-smooth motion at low speeds
- Direct drive — no ballscrew, no belt, no backlash
- High acceleration — up to 100 m/s² achievable
- Sub-micron positioning accuracy with glass scale
- Maintenance-free — no mechanical wear parts
Applicable Industries:
Semiconductor wafer handling, optical inspection, medical imaging, precision metrology, laser cutting, flat panel display manufacturing, laboratory automation
Series: MHE9 (9 mm air gap, 27N continuous force)
Installation Requirements:
- Mount magnet track on flat, rigid surface — flatness tolerance: <0.02 mm over full length
- Align forcer to track — lateral misalignment: <0.1 mm
- Do not exceed 4.0 m/s speed
- Connect encoder cable with shielded twisted pair — ground at drive end
- Do not drop or impact forcer — glass scale is fragile
Usage Notes:
- Glass scale contamination will cause position errors — keep clean
- Do not exceed 81 N peak force — coil overheating risk
- Air gap must remain 9 mm ±0.5 mm — shimming required if mounting surface is uneven
- Lubricate bearing carriage with Kollmorgen-specified grease every 5000 hours
