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Kollmorgen S72401-US
Product Overview:
The S72401-US is an AC servo motor from Kollmorgen’s S700 product family. The “724” indicates the frame size (approximately 130 mm flange). The option code “01” specifies: 0 = No brake, 1 = No shaft seal. The suffix “US” denotes United States specification — this includes UL/CSA certification, NEMA mounting compatibility, and 60 Hz rated frequency. This motor is designed for the North American market with full regulatory compliance.
Detailed content
Key Specifications:
| Parameter | Value |
|---|---|
| Frame Size | S724 (approximately 130 mm flange, NEMA-compatible) |
| Continuous Torque (Rated) | 12.7 Nm (1124 in-lb) |
| Peak Torque | 38.1 Nm (3372 in-lb) |
| Rated Speed | 3000 RPM (3600 RPM at 60 Hz) |
| Max Speed | 4500 RPM (5400 RPM at 60 Hz) |
| Rated Power (Continuous) | 4.0 kW (5.36 HP) |
| Peak Power | 12.0 kW (16.1 HP) |
| Voltage Rating | 200–240 VAC (60 Hz, single-phase or three-phase) |
| Brake (Holding Brake) | None (0 option) |
| Shaft Seal | None (1 option) |
| Encoder | Absolute multi-turn, 131,072 counts/rev |
| Shaft Diameter | 22 mm, with keyway |
| Certifications | UL 508C, CSA C22.2 No. 101, CE (with US variant) |
| Motor Weight | Approximately 8.2 kg (18.1 lb) |
Construction & Materials:
- Stator: Silicon steel laminations, Class H insulation, VPI processed
- Rotor: NdFeB permanent magnets, carbon fiber sleeve retention
- Shaft: Hardened stainless steel, 22 mm diameter, keyway
- Housing: Cast aluminum alloy, UL-recognized material
- Bearings: Sealed ball bearings, L10 life > 20,000 hours
- Wiring: UL-listed cable, 60°C rated, per NEC Article 430
Performance Parameters:
| Parameter | Value |
|---|---|
| Torque Constant (Kt) | 0.40 Nm/A |
| Back-EMF Constant (Ke) | 40.0 V/krpm |
| Phase Resistance (25°C) | 0.35 Ω (phase-to-phase) |
| Phase Inductance | 3.5 mH (phase-to-phase) |
| Rotor Inertia | 0.0011 kg·m² |
| Mechanical Time Constant (τm) | 7.8 ms |
| Electrical Time Constant (τe) | 10.0 ms |
| Max Continuous Current (RMS) | 22 A |
| Peak Current (10 sec) | 66 A |
| Insulation Class | H (180°C), UL Class H recognized |
| Dielectric Strength | 1500 VAC, 1 minute (winding to frame, UL test) |
Advantages:
- US-certified (UL/CSA) — ready for North American installation without additional testing
- 60 Hz rated — optimized for North American mains frequency
- NEMA mounting pattern — direct bolt-on replacement for legacy NEMA motors
- No brake, no seal — minimal configuration for OEMs managing these externally
- Absolute encoder — eliminates homing, reduces commissioning time
Applicable Industries:
- North American Manufacturing — CNC machines, presses, conveyors
- Packaging — high-speed filling, capping, labeling lines
- Printing — web offset, flexographic press drives
- Automotive — assembly line robots, weld cell actuators
- Food & Beverage (US) — USDA/FDA-compliant equipment motion systems
Installation Requirements:
- NEMA mounting pattern — verify bolt hole spacing matches existing equipment
- 4-bolt flange, M8 × 1.25 bolts, torque to 25 Nm per bolt
- Wiring per NEC Article 430 — use UL-listed cable, proper grounding
- Thermal path: conduction-cooled, target thermal resistance ≤ 0.4 °C/W
