Description
Kollmorgen 6SM37VL-6000 | 1.0kW 6000RPM AC Servo Motor
Architect’s Product Breakdown
The Kollmorgen 6SM37VL-6000 is an extended-stack, high-speed AC synchronous brushless servo motor. Built with rare-earth permanent magnets embedded in the rotor, it provides exceptionally high power density, rapid acceleration, and precise torque delivery across its entire operating range.
Model designation breakdown:
- 6SM: Synchronous Brushless AC Servo Motor series
- 37: Frame size class and stator outer diameter
- VL: Extended stack length / custom winding code (delivering higher torque output than the M or L variants)
- 6000: Maximum rated operating speed of 6,000 RPM
- -G / -Br: Optional suffixes indicating an integrated 24V DC holding brake
This model utilizes an integrated resolver feedback unit to communicate shaft position and speed directly back to digital servo amplifiers, such as the Kollmorgen SERVOSTAR 600 / 300 series. Maintaining exact part-number matching avoids the need to change mounting flanges, recalculate mechanical inertia ratios, or adjust servo drive feedback gain parameters.
6SM37VL-6000
Key Technical Specifications
| Parameter | Technical Specification |
| Manufacturer | Kollmorgen / Seidel |
| Product Line | 6SM Synchronous Brushless Servo Series |
| Part Number | 6SM37VL-6000 / 6SM37VL-6000-G |
| Rated Output Power (P_N) | ~1.01 kW (1010 W) |
| Standstill / Holding Torque (M_0) | 3.0 Nm |
| Rated Current (I_0) | 3.7 A |
| Rated / Max Speed (n_N) | 6000 RPM |
| Supply Voltage Class | 400 V / 460 V AC 3-Phase |
| Optional Holding Brake | 24V DC (on variants with -G or -Br suffix) |
| Protection Class | IP64 / IP65 |
| Insulation Class | Class F (per DIN 57530) |
| Weight | ~3.5 kg – 4.2 kg (varies with brake configuration) |
Field Engineer’s Pitfall Guide
- NEVER Connect Directly to Mains AC Power: This permanent magnet motor requires a regulated 3-phase servo drive (e.g., Kollmorgen SERVOSTAR). Connecting it directly to a utility grid supply will cause immediate stator winding destruction or permanent rotor demagnetization.
- Observe 24V DC Holding Brake Polarity: Suffix -G variants feature a 24V DC electromagnetic holding brake. Verify that the 24V power supply is fully engaged (releasing the brake) prior to enabling the drive stage; running the drive against an engaged brake causes rapid coil thermal overload.
- Do Not Shift the Rear Resolver Housing: The resolver is factory-aligned to the rotor’s magnetic poles. Loosening or rotating the resolver during maintenance will corrupt the feedback angle, resulting in uncontrollable runaway conditions or high-current overcurrent drive trips.
- Monitor Thermal Contact Lead: The motor contains an internal normally-closed thermostat. Ensure these leads are connected back to the servo drive’s motor protection circuit to prevent thermal damage under prolonged high-torque duty cycles.
QA & Testing SOP
- Mechanical & Winding Diagnostic: Check shaft concentricity, bearing noise, phase-to-phase winding resistance, and 1000V DC megohmmeter insulation tests across all phases to ground.
- Sinusoidal Back-EMF Audit: Rotate the shaft on a motor test bench to verify symmetrical, low-distortion 3-phase open-circuit back-EMF voltage signals.
- Resolver Signal & Zero-Phase Alignment: Test resolver transformation ratio, signal balance, and electrical zero-point positioning relative to stator phases.
- Dynamic Servo Drive Bench Run: Run under load connected to a Kollmorgen SERVOSTAR amplifier at up to 6000 RPM. Validate speed loop stability, current draw (3.7A nominal), and brake release/engage timing.
- ESD Protective Packaging: Clean exterior, apply protective shaft/keyway sleeve, wrap in static-shielding film, and pack with heavy-duty molded foam in a reinforced carton.
Technical FAQ
What is the difference between 6SM37M, 6SM37L, and 6SM37VL models?
The suffix designates stator stack length and power rating:
- M (Medium): Standard stack length (e.g., 1.0 Nm standstill torque, 0.5 kW).
- L (Long): Longer stack for increased torque at lower/medium speeds (1.5 Nm, 0.5 kW).
- VL (Very Long): Extended stack providing higher power (~1.01 kW) and continuous standstill torque (3.0 Nm) while maintaining a 6000 RPM top speed rating.
Can I replace a 6SM37VL-6000 with a modern Kollmorgen AKM motor?
Yes, but it is not a direct plug-and-play swap. Transitioning to a modern Kollmorgen AKM series motor (e.g., AKM3x or AKM4x) requires checking mechanical shaft/flange dimensions, selecting a resolver-feedback model, and updating motor parameters in the servo drive software.
What causes an overtemperature trip on this motor?
Overtemperature trips usually stem from operating above the 3.7A rated continuous current limit, insufficient heatsinking through the mounting flange, high ambient enclosure temperatures, or a mechanically dragging/partially engaged 24V brake.
