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Kollmorgen DH083A-13-1210

Product Introduction:
The DH083A-13-1210 is a frameless direct-drive torque motor from Kollmorgen’s DH083A product line. The model code breakdown: “DH” = DirectDrive Hollow rotor, “083” = 83 mm outer diameter, “A” = Series A (standard performance), “13” = frame/stack variant 13, “1210” = 121 mm stack length. This motor features a hollow rotor with no shaft, no bearings, and no housing — it integrates directly into the customer’s mechanical assembly.

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Detailed content

Model Series: DH083A Series

Technical Specifications:

Parameter Value
Motor Type Direct-Drive Frameless Torque Motor (Hollow Rotor)
Outer Diameter (Stator) 83 mm
Inner Diameter (Rotor Bore) 32 mm
Stack Length 121 mm
Continuous Torque 2.2 Nm
Peak Torque 6.6 Nm
Continuous Speed 3000 RPM
Max Speed 6000 RPM
Rated Power (Continuous) 0.69 kW
Peak Power 2.1 kW
Rated Voltage (DC Bus) 325 VDC
Phase Current (RMS, Continuous) 3.0 A
Phase Current (Peak) 9.0 A
Winding Inductance 1.8 mH
Winding Resistance 1.8 Ω
Rotor Inertia 0.0008 kg·m²
Weight (Stator + Rotor) 1.4 kg
Encoder Option Resolver (standard), EnDat 2.2 (optional)
Cooling Conduction through customer structure
IP Rating N/A (frameless)

Structural Features:

  • Hollow cylindrical frameless design
  • Stator mounts to machine structure via flange
  • Rotor mounts to load — no shaft, no bearings
  • 32 mm bore allows wiring/cooling through center
  • Resolver feedback standard; absolute encoder optional
  • Precision-balanced rotor for high-speed operation (up to 6000 RPM)

Material Composition:

  • Stator Core: High-grade silicon steel laminations (0.2 mm)
  • Rotor Magnets: Neodymium Iron Boron (NdFeB, N42SH grade)
  • Stator Windings: Class H insulation (180°C), copper, VPI impregnated
  • Resolver: Stainless steel housing, hermetically sealed
  • Bonding: Epoxy potting for environmental protection

Working Principle:
Frameless PMSM torque motor. Stator is mounted to the machine frame. Rotor with NdFeB magnets is mounted on the driven load. Three-phase currents from the servo drive create a stator magnetic field that interacts with the rotor magnets, producing torque directly on the load. No gearbox, no coupling, no backlash. Resolver provides sin/cos feedback for commutation and velocity control.

Functional Features:

  • Zero-backlash direct drive
  • 32 mm hollow bore for cable routing
  • High-speed capability up to 6000 RPM
  • Resolver feedback for robust operation in harsh environments
  • Compact 83 mm OD × 121 mm length

Advantages:

  • Zero backlash — superior positioning accuracy
  • Highest speed in DH083 family (6000 RPM)
  • Hollow bore (32 mm) for integrated wiring
  • Lightweight at 1.4 kg
  • NdFeB magnets for highest torque density in this size

Applicable Industries:

  • Camera gimbals (drone, cinema)
  • Robot wrist joints
  • Antenna positioning (small satellite dishes)
  • Optical scanners and mirrors
  • Medical robotics end-effectors
  • Semiconductor inspection stages

Installation Requirements:

  • Stator concentricity to mounting surface: < 0.025 mm
  • Rotor balance: G2.5 per ISO 1940
  • Customer provides bearing support on both rotor ends
  • Air gap: 0.25 mm ± 0.05 mm
  • Resolver cable max 15 m (6-wire shielded)
  • Apply thermal compound between stator and mounting surface

Usage Notes:

  • Customer provides all bearings — motor has no bearing support
  • Maximum continuous speed: 3000 RPM (6000 RPM peak, short duration)
  • Air gap is critical — mechanical contact will damage NdFeB magnets
  • NdFeB magnets have lower max temperature than SmCo — limit to 120°C

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