Description
Product Introduction
The Kollmorgen 6SM37L-4.000 is a high-dynamic AC synchronous servo motor originally developed under the Kollmorgen Seidel line for precision motion control. Plant automation engineers deploy this motor in high-speed positioning axes across CNC machine tools, automated packaging equipment, and industrial robotics cells where rapid acceleration and precise torque delivery are paramount.
Built with neodymium permanent magnets and integrated resolver feedback, the 6SM37L-4.000 pairs seamlessly with Kollmorgen DIGIFAS, SERVOSTAR, and legacy Seidel drive amplifiers. In our field experience, replacing a degraded unit with an exact 6SM37L-4.000 motor preserves existing mechanical coupling dimensions and electrical feedback alignment, saving hours of recalibration.
Key Technical Specifications
| Parameter | Value |
| Part Number | 6SM37L-4.000 |
| Manufacturer | Kollmorgen (Seidel Servo Systems) |
| Motor Type | Permanent Magnet AC Synchronous Servo |
| Frame Size / Series | 6SM Series – Size 3 |
| Stack Length | L (Long Stack) |
| Rated Speed (n_N) | 4000 RPM |
| Feedback Unit | Integrated Two-Pole Resolver (Standard) |
| Winding Insulation | Class F (155°C) |
| Enclosure Rating | IP65 (excluding shaft pass-through) |
| Cooling Method | Natural Convection / Surface Heat Dissipation |
Application Scenarios & The “Trench” Experience
A high-throughput bottling plant suffered an abrupt halt on its main rotary indexing starwheel when the X-axis servo motor threw an over-temperature and feedback tracking fault. Diagnostic checks revealed worn rear shaft bearings and phase winding insulation failure caused by ingress of washdown fluids into the housing over years of operation. With line stoppage costs mounting every minute, retrofitting a modern motor family meant re-machining mounting plates and rewriting drive parameter files.
- Packaging & Palletizing – Rotary Indexing Drives – Delivers high dynamic response for rapid start-stop positioning.
- CNC Metalworking – Auxiliary Axis Feeders – Provides smooth low-speed torque without cogging for accurate tool feeding.
- Textile & Converting Machinery – Web Tension Control – Maintains precise velocity control linked back to digital drive amplifiers.
The maintenance team pulled the damaged unit and installed a bench-tested 6SM37L-4.000 surplus motor. Because the internal resolver alignment matched factory specifications, the drive locked onto the rotor pole zero position immediately upon power-up, restoring full line production within ninety minutes.
6SM37L-4.000
6SM37L-4.000
Transparency SOP: Quality Assurance & Testing
We do not just ship boxes; we test them on live Kollmorgen servo drive test benches. Every 6SM37L-4.000 motor undergoes the following verification process:
- Inbound Mechanical Check: Inspected for shaft runout, smooth bearing rotation, flange condition, and connector pin integrity.
- Winding Resistance & Megger Test: Insulation resistance is tested using a 1000V Megger between phases and frame ground to ensure zero winding breakdown.
- Resolver Alignment Verification: Feedback signals are aligned using an oscilloscope to confirm the resolver commutates correctly relative to the motor’s back-EMF waveform.
- Dynamic Drive Run Test: Driven to its rated 4000 RPM on a SERVOSTAR/DIGIFAS drive to verify thermal stability, smooth acceleration, and low acoustic noise.
- Protective Packaging: Sealed in protective wrapping with heavy-duty foam casing to prevent shaft bending or connector damage during shipment.
The Veteran’s Tech Trap Guide (Crucial Value-Add)
- ⚠️ Never Strike the Shaft Extension: When mounting pinions or timing belt pulleys, never use a hammer to force components onto the shaft. Direct axial impacts will shatter the internal ceramic resolver ring or brinell the ball bearings. Always use a proper puller or threaded assembly tool.
- ❗ Resolver Phase Alignment (Zero Point): Do not loosen the end bell bolts or tamper with the rear feedback cover! If the internal resolver housing shifts relative to the stator, the drive will lose commutation angle, leading to uncontrolled runaway or immediate overcurrent trips.
- ⚠️ Check Connector O-Rings: The round Intercontec power and feedback connectors rely on rubber seal rings to maintain IP65 integrity. If fluid enters the signal plug due to a missing O-ring, it will short out the resolver lines and throw mysterious feedback faults.
Frequently Asked Questions (FAQ for Conversion)
Q: Does the 6SM37L-4.000 include an integrated holding brake?
A: The base model suffix “-4.000” specifies a 4000 RPM motor configuration. Holding brakes were optional additions from the factory; check your motor nameplate or exact suffix callouts if your Z-axis application requires a 24V holding brake.
Q: Can I drive this motor with non-Kollmorgen servo drives?
A: Yes, provided the third-party drive supports standard sinusoidal permanent-magnet AC synchronous motors and can interpret standard 2-pole resolver feedback signals.
Q: What is the significance of the “4.000” in the part number?
A: The “4.000” designates the rated nominal speed of 4000 RPM for this specific stator winding configuration.
Q: What should I do if the motor runs away upon power-up?
A: A motor runaway (instantly tripping on overspeed/overcurrent) usually indicates swapped feedback lines (SIN/COS) or a misaligned resolver commutation angle. Verify connector pinouts before re-applying main power.
Q: What warranty is provided with this surplus motor?
A: We back all our new surplus and rig-tested 6SM37L-4.000 servo motors with a full 12-month replacement warranty.
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