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Kollmorgen 6SM77K-3.000-G
Product Brief: 3-phase sinusoidally wound PMSM servo motor with high-energy NdFeB magnets, optimized for dynamic response and low cogging. Frame 77 × 77 mm flange. “K” winding = medium-torque, medium-speed winding. “3.000” = 3000 rpm rated speed. “-G” suffix = Equipped with 24 VDC spring-applied electromagnetic holding brake. Compatible with Kollmorgen SERVOSTAR / S700 / AKD (480 V models) and legacy BDS4/6 drives with correct current/tuning.
Detailed content
Flange Size (Frame): 77 mm × 77 mm (IEC 77, sometimes referenced as NEMA 34 equivalent but metric 77×77)
Shaft Diameter: 19 mm (keyed or smooth — verify from nameplate; 6SM77 typically 19 mm with keyway)
Rated Speed (nN): 3000 rpm
Rated Torque (Continuous, Tc): ≈ 3.0 Nm (K-winding typical)
Peak Torque (Tp, short term): ≈ 9.0 Nm (3× continuous)
Rated Power: ≈ 0.95 kW (π × Tc × nN / 9550 ≈ 0.95 kW @ 3000 rpm)
Rated Current (RMS): ≈ 2.8 – 3.5 A (winding dependent)
Peak Current (RMS): ≈ 9 – 10 A
Torque Constant (Kt): ≈ 0.9 – 1.05 Nm/A (line-to-line)
Back-EMF Constant (Ke): ≈ 60–75 V/krpm (line-to-line RMS)
Winding Resistance (Line-Line, 20 °C): ≈ 3.5 – 5.0 Ω
Winding Inductance (Line-Line): ≈ 15 – 25 mH
Rotor Inertia (without brake): ≈ 1.1 × 10⁻⁴ kg·m² (1.1 kg·cm²)
Brake Specification (G option): 24 VDC spring-applied, power-off engaged; Holding torque ≈ 3–5 Nm (typical for 6SM77 brake); Release current ~0.5 A; Power consumption ~12–18 W
Feedback Device (Typical): Resolver (standard on 6SM) or incremental encoder — verify actual unit; many 6SM77 shipped with 2-pole resolver
Protection Class: IP64 / IP65 (sealed shaft with lip seal; connector IP65 when mated)
Insulation Class: F (155 °C)
Cooling: Natural convection
Operating Temperature (Ambient): 0 °C to +40 °C (rated); –20 °C to +55 °C with derating
Weight (with brake): ≈ 7–8 kg
Connector Type: Circular military-style or Hirschmann-style multi-pin (power + feedback + brake)
Compliance: CE (legacy), cURus
Applicable Industries: Machine tool auxiliary axes, packaging formers, textile yarn feeders, woodworking spindle positioners, legacy automation retrofits originally designed around 6SM platform
Installation Requirements: Flange-mount with 4× M8 bolts on 92.5 mm BCD (check drawing); couple shaft coaxially; connect brake to 24 VDC via separate supply fused ≤ 1 A; motor PE essential; feedback shield grounded at drive end.
Usage Notes: Brake releases when 24 VDC applied — ensure brake release interlock in drive logic (many drives have Brake Output relay); do not leave brake coil energized > duty cycle spec (typically 100 % ED when released); 6SM motors have thermal time constant ~20–30 min — overload permissible for short periods per torque curve; verify feedback type matches drive before commissioning (resolver vs encoder).
