Description
Kollmorgen 6SM57M-3.000 | 1.1kW 3000RPM AC Servo Motor
Architect’s Product Breakdown
The Kollmorgen 6SM57M-3.000 is a mid-frame, brushless AC synchronous servo motor from the classic 6SM family (covering frame sizes from 6SM27 up through 6SM107). Engineered with rare-earth neodymium magnets bonded to the rotor, this motor delivers excellent power density, high acceleration torque, and low cogging.
The model code breaks down as follows:
- 6SM: Synchronous Brushless Servo Motor product line
- 57: Frame size specification (larger physical housing and rotor diameter than the 6SM37 series)
- M: Medium stack length / winding configuration variant
- 3.000: 3,000 RPM nominal operating speed
Equipped with Class F winding insulation (per DIN 57530), a built-in normally closed thermal switch in the stator, and an integrated resolver feedback unit, the 6SM57M-3.000 interfaces natively with digital drive amplifiers such as the Kollmorgen SERVOSTAR series (300/600/700).
Sourcing an exact 6SM57M-3.000 replacement prevents the operational downtime associated with retrofitting mechanical mounting flanges, re-tuning servo drive gain loops, or rewiring encoder/resolver cable connectors.
6SM57M-3.000
Key Technical Specifications
| Parameter | Technical Specification |
| Manufacturer | Kollmorgen / Seidel |
| Product Line | 6SM Synchronous Servo Series |
| Part Number | 6SM57M-3.000 / 6SM57M-3000 |
| Rated Output Power (P_N) | ~1.1 kW (1100 W) |
| Standstill / Holding Torque (M_0) | 4.5 Nm |
| Rated Torque (M_N) | 3.5 Nm |
| Rated Speed (n_N) | 3000 RPM |
| Standstill Current (I_0) | ~3.0 A |
| Supply Voltage Class | 400 V / 460 V AC 3-Phase |
| Protection Class | IP64 (IP65 available with optional radial shaft seal) |
| Insulation Class | Class F (per DIN 57530) |
| Weight | ~5.8 kg (12.8 lbs) |
Field Engineer’s Pitfall Guide
- DO NOT Connect Directly to Utility AC Mains: Like all permanent magnet synchronous motors, the 6SM57M-3.000 requires a closed-loop 3-phase AC servo drive. Direct connection to raw grid power will cause immediate winding failure or permanent rotor demagnetization.
- Observe Optional Brake Supply Requirements: If your unit carries a brake suffix (e.g.,
-Gor-Br), it contains an internal 24V DC electromagnetic holding brake. Always verify that 24V DC power is supplied to disengage the brake before enabling motor current; running the motor against a locked brake will rapidly burn out the stator windings. - Do Not Loosen the Rear Resolver Alignment: The internal resolver is factory-zeroed to the rotor’s magnetic poles. Disturbing or rotating the resolver during field service will corrupt the commutation feedback, leading to runaway speed conditions or immediate drive overcurrent faults.
- Connect Thermal Protection Wire Leads: Ensure the embedded, potential-free thermal switch wires are routed to the servo drive’s motor temperature monitoring terminals. This safeguards the motor against thermal overload during continuous high-torque maneuvers.
QA & Testing SOP
- Mechanical & Winding Verification: Check keyway, shaft runout, and bearing smoothness. Perform phase-to-phase stator resistance checks and 1000V DC megohmmeter insulation tests to ground.
- Back-EMF Waveform Symmetry: Rotate the motor on a dynamic test rig to confirm clean, balanced 3-phase sinusoidal open-circuit back-EMF voltage output across all phases.
- Resolver & Zero-Phase Alignment: Check resolver transformation ratio, signal balance, and electrical zero-point positioning relative to stator phases.
- Dynamic Servo Bench Test: Drive the motor under load tied to a Kollmorgen SERVOSTAR amplifier up to 3000 RPM. Validate torque response, speed loop stability, and 24V brake release functionality (if equipped).
- ESD Protective Packaging: Clean outer housing, install protective shaft sleeve, wrap in static-shielding film, and pack securely using custom high-density foam cushioning.
Technical FAQ
What is the main difference between the 6SM37 and 6SM57 motor families?
The 6SM57 family features a larger physical frame size and motor diameter than the 6SM37 series. This larger frame provides higher continuous standstill torque (4.5 Nm on the 6SM57M vs. 1.0–1.5 Nm on the 6SM37 series) and higher thermal capacity for demanding industrial loads.
Can I replace a 6SM57M-3.000 with a modern Kollmorgen AKM motor?
Yes, but it requires mechanical and drive migration. A modern equivalent from the AKM series (such as an AKM4x or AKM5x) requires verifying shaft and flange mounting dimensions, choosing a resolver feedback option, and updating motor configuration parameters in the drive software.
What causes an overtemperature fault on this motor?
Common causes include running above the continuous rated standstill current (~3.0A), poor thermal dissipation through a dirty mounting flange, high ambient enclosure temperatures, or a dragging/partially engaged holding brake.
