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Kollmorgen 77K-3.000-G

Product Overview

77K-3.000-G is a large frame 77mm outer diameter closed-loop hybrid stepper motor, optimized for high static holding torque and 3000 RPM maximum high-speed operation. Designed for cost-effective open/closed-loop positioning axes without high-end servo system budget constraints, compatible with Kollmorgen ServoStar S600 series stepper drive controllers, integrated high-resolution encoder for closed-loop anti-lost-step operation capability.
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Detailed content

Full Technical Performance Parameters

  1. Core Electrical Specs
    • Rated Operating Phase Voltage: 3 VDC
    • Rated Single Phase Current: 2.0 Arms RMS
    • Step Angle: 1.8° full step / 0.00703125° microstep maximum resolution
    • Static Holding Torque (Zero RPM): 8.0 N·m
    • Maximum Mechanical Rotational Speed: 3000 RPM
    • Rotor Inertia: 0.00042 kg·m²
  2. Mechanical Frame Specs
    • Outer Stator Housing Diameter: 77mm
    • Standard Mount Flange: NEMA 34 industrial standard mounting footprint
    • Shaft Dimension: 14mm keyed solid output shaft
    • Continuous Radial Shaft Load: 280N; Continuous Axial Shaft Load: 140N
  3. Encoder Configuration (G Suffix)

    Built-in 1000-line incremental closed-loop feedback encoder for step loss compensation

Standard Functional Features

  1. Closed-loop encoder feedback eliminates traditional hybrid stepper motor lost-step failure under sudden load fluctuation
  2. High-torque stacked silicon steel core delivers industry-leading static holding torque within NEMA34 frame size
  3. Wide operating speed range from zero RPM static hold to maximum 3000 RPM high-speed positioning
  4. Multi-microstep resolution support via matched S600 stepper drive for ultra-smooth low-speed operation
  5. Low vibration optimized magnetic circuit design reducing audible noise during continuous high-cycle operation
  6. Compatible with open-loop pulse/direction and closed-loop analog velocity command control modes

Material & Structural Composition

  • Stator Housing: Cast aluminum alloy black matte anti-corrosion coating
  • Stator & Rotor Laminations: High-permeability silicon steel hybrid stepper core stack
  • Permanent Magnet Rotor: Rare earth high coercivity ferrite magnet assembly
  • Output Shaft: Heat-treated alloy steel precision ground keyed shaft
  • Bearings: Heavy-duty double sealed ball bearings for high radial load tolerance
  • Encoder Housing: Integrated rear-mounted plastic sealed encoder module with IP54 protection
  • Total Net Weight: 3.2kg

Working Operational Principle

Dual-phase bipolar pulse current output from matched S600 stepper drive sequentially energizes stator phase windings to generate alternating magnetic fields rotating around rotor assembly. Hybrid permanent magnet rotor rotates fixed 1.8° step angle per full pulse signal. Built-in incremental encoder continuously samples actual rotor position and transmits feedback signal back to drive closed-loop circuit; drive automatically compensates pulse output count to eliminate step loss under overload or rapid acceleration conditions. Static holding torque maintains fixed shaft position when drive phase current remains energized without pulse command input.

Product Competitive Advantages

  1. Closed-loop feedback architecture combines stepper motor low system cost with servo motor anti-step-loss reliability
  2. 8Nm static holding torque eliminates external brake requirement for vertical load positioning axes
  3. Maximum 3000 RPM operating speed outperforms standard low-speed NEMA34 stepper motor variants
  4. NEMA34 universal mounting footprint compatible with global standard mechanical machine design
  5. Lower total system hardware cost compared to equivalent torque permanent magnet servo motor + drive combination

Applicable Industrial Sectors

CNC woodworking routing machines, automated material cutting equipment, heavy-duty conveyor positioning axes, 3D printing large format gantry systems, textile loom warp positioning axes, laser marking large worktable positioning machinery.

Installation Mandatory Technical Rules

  1. NEMA34 flange mounting surface flatness tolerance ≤0.03mm; mounting bolt torque tightened to 5.0 N·m evenly
  2. Shaft coupling radial coaxial alignment error ≤0.06mm to prevent excessive bearing wear at 3000RPM high speed
  3. Operating ambient temperature range: -10°C to +40°C; storage temperature -30°C to +70°C
  4. Continuous vibration exposure limit ≤0.6g; isolate from heavy stamping or forging equipment vibration sources
  5. Encoder feedback cable minimum bending radius 10× cable outer diameter; repeated flexing prohibited
  6. Install forced air cooling fan adjacent to motor housing for continuous 24-hour production shift full-load operation

Standard Operation & Maintenance Precautions

  1. Bearing service life 15,000 continuous full-load operating hours; no field lubrication refill capability
  2. Rear encoder module IP54 protection; prevent liquid coolant or fine metal dust intrusion into encoder housing
  3. Disconnect stepper drive power before plugging/unplugging encoder feedback connector to avoid encoder chip damage
  4. If step loss alarm triggers, inspect mechanical load binding and verify drive closed-loop gain parameter configuration
  5. Quarterly motor housing surface dust cleaning to maintain heat dissipation efficiency during continuous high-speed operation
  6. Static holding torque decreases 15% above 45°C ambient temperature; forced cooling mandatory for high-temperature workshop environments

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