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Kollmorgen B-604-C-A3-B2

Model Code Breakdown:

  • B — Resolver Product Family
  • 60 — 60mm Housing Diameter
  • 04 — 4 Pole Pairs (8 poles total)
  • C — Electrical Configuration C
  • A3 — Output Configuration A3
  • B2 — Mechanical Configuration B2
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Detailed content

Product Overview:
The B-604-C-A3-B2 is a large-frame resolver designed for high-inertia, high-torque servo motors typically found in main spindle drives, large gantry axes, and heavy rotary tables. Its 60mm housing accommodates the larger windings required for reliable signal output at high speeds.

Technical Specifications:

Parameter Value
Housing Diameter 60mm
Overall Length ~80mm (with shaft)
Pole Pairs 4 (360° electrical = 90° mechanical)
Excitation Voltage 4.5–7.0 Vrms
Excitation Frequency 2.5 kHz – 10 kHz
Output Signals Sin θ, Cos θ (analog, ratiometric)
Output Amplitude 0.5–3.6 Vrms
Accuracy ±2.5 arc-min (±0.042°) electrical
Linearity ±0.04% FS
Operating Speed 0 to 6,000 RPM (continuous)
Shaft Diameter 14mm solid shaft (B2 config)
Shaft Length 30mm
Keyway DIN 6885-1, 4×4×22mm (B2 config)
Electrical Connector M23 12-pin
Operating Temperature -40°C to +125°C
Vibration Rating 20g peak, 10–2000 Hz
Shock Rating 50g, 11ms
IP Rating IP67
Weight ~0.55 kg
Compliance CE, UL, RoHS

Working Principle:
Brushless electromagnetic resolver — stator excitation at 2.5–10 kHz induces Sin θ and Cos θ voltages in the rotor winding. The 4 pole pairs provide 4 electrical cycles per mechanical revolution, delivering 4× the resolution of a 1-pole-pair resolver at the same speed.

Structural Features:

  • 60mm housing — largest in standard B-series catalog
  • 14mm shaft with keyway — handles high torque coupling from large motors
  • M23 12-pin connector — carries excitation + Sin + Cos + shield + temperature sensor
  • Conformal-coated windings — moisture and chemical resistance

Advantages:

  • 4 pole pairs deliver 0.0225° electrical resolution (16× per rev with quadrature decoding)
  • 6,000 RPM continuous — suitable for high-speed spindles
  • 14mm keyed shaft — handles up to 50 Nm coupling torque
  • IP67 + 125°C — survives coolant, oil mist, and high ambient temperatures

Applicable Industries:
CNC Spindle Drives, Large Gantry Mills, Rotary Tables, Heavy Presses, Steel Mill Rollers, Wind Turbine Main Bearings, Large Robot Joints

Installation Requirements:

  • Mount with 4× M6 screws on 50mm bolt circle
  • Maximum shaft misalignment: 0.15mm radial, 0.15° angular
  • Excitation cables: twisted-pair shielded, max 20m length
  • Ground shield at drive end only

Usage Notes:

  • Configure drive for 4 pole pairs — setting 1 or 2 will cause 4× or 2× position error respectively
  • Maximum shaft speed: 6,000 RPM — do not use on higher-speed applications
  • A3 output: ratiometric Sin/Cos — do not apply external bias voltage
  • Verify keyway orientation during installation — 180° error causes following error spike

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