Description
Hard-Numbers: Technical Specifications
- Continuous Stall Torque: 16.5 Nm (145 in-lb)
- Peak Torque: 49.5 Nm (437 in-lb)
- Rated Speed: 2500 RPM
- Continuous Power: 4.5 kW (6.0 HP)
- Peak Power: 13.5 kW (18.1 HP)
- Voltage Constant: 105 V/kRPM
- Torque Constant: 1.45 Nm/A
- Resistance: 0.37 ohms (line-to-line)
- Inductance: 4.8 mH (line-to-line)
- Feedback: SRS Resolver (sinusoidal resolver system)
- Thermal Time Constant: 40 min
- Inertia: 12.8 kg·cm²
- Weight: 24 kg (53 lb)
- Mounting: IEC flange 130 mm with 12 mm shaft diameter
KOLLMORGEN S22460-SRS
The Real-World Problem It Solves
You need a motor that can grind through high-torque cycles without overheating or losing position. The S22460-SRS delivers 16.5 Nm continuous torque in a compact 400mm frame, and the resolver feedback laughs at electrical noise that would make an optical encoder glitch out in dirty industrial environments.
Where you’ll typically find it:
- Ball screw drives on CNC machining centers
- Extruder screw drives in plastic processing
- Turret and axis positioning on large machine tools
The bottom line: When the application demands torque over speed and the environment is electrically noisy, this motor with resolver feedback is the workhorse that keeps running.
Hardware Architecture & Under-the-Hood Logic
This is a standard 8-pole brushless servo motor using sinusoidal commutation. The rotor holds permanent magnets, and the stator windings generate a rotating magnetic field. The resolver mounted on the non-drive end provides absolute position feedback through inductive coupling rather than optical sensing.
Here’s how the motor generates torque:
- Drive outputs three-phase AC current to stator windings
- Current vector aligns with rotor position via resolver feedback
- Magnetic interaction between stator field and rotor magnets produces torque
- Resolver excitation (10 kHz reference) and feedback signals travel through shielded cable
- Internal thermal switch opens at 150°C for overtemperature protection
- Front shaft seal keeps contaminants out, IP65 rated when properly mated
KOLLMORGEN S22460-SRS
Field Service Pitfalls: What Rookies Get Wrong
Resolver Wiring ConfusionThe SRS resolver has six wires: two excitation, two sine, two cosine. I’ve seen techs cross them or tie shields wrong, resulting in position drift or complete failure to commutate.
- Field Rule: Use the resolver cable diagram stamped on the motor nameplate. The excitation pair is typically the highest resistance. Verify with a multimeter—excitation should be around 20-30 ohms, feedback windings 10-15 ohms each.
Incorrect Phase SequenceUnlike a standard induction motor, servo motors require specific phase sequence for proper direction. If you swap any two phases, the drive will fault on commutation error immediately.
- Quick Fix: Use the drive’s phase sequence test feature if available. Otherwise, mark U, V, W clearly during removal and reconnect in the same order. If the motor spins backward, swap two phases in the drive parameters, not the wiring.
Thermal Margin NeglectThis motor can dump 4.5 kW of heat into the cabinet at rated load. Techs undersize the cooling or block airflow, then wonder why thermal faults plague their cycle.
- Field Rule: Calculate continuous RMS torque from your motion profile. If you’re above 80% of rated torque, you need external blower cooling. Measure cabinet temperature rise under load—if you’re hitting 45-50°C ambient inside, add ventilation or derate the motor.
