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KOLLMORGEN MT304A1-R2C1
Product Type: Brushless AC Servo Motor with Integrated Feedback
Product Introduction:
The MT304A1-R2C1 is a medium-frame servo motor from Kollmorgen’s MT Series. It is designed for high-torque industrial applications requiring robust construction and precise motion control. The motor features an absolute encoder for position tracking without homing.
Detailed content
Technical Specifications:
| Parameter | Value |
|---|---|
| Frame Size | 115 mm (flange) |
| Motor Type | Brushless AC (BLAC), 3-phase, sinusoidal |
| Rated Torque (Continuous) | 4.2 Nm |
| Peak Torque | 12.6 Nm (3× rated, 1 sec) |
| Rated Speed | 2,500 RPM |
| Max Speed | 4,500 RPM |
| Rated Voltage | 300 VAC (or 420 VDC bus) |
| Feedback Type | Multi-turn absolute encoder (17-bit single-turn + 12-bit multi-turn, 131,072 + 4,096 counts) |
| Insulation Class | Class F (155°C) / Class H (180°C) option |
| IP Rating | IP65 (with connector) |
| Weight | ~5.8 kg (motor only) |
| Shaft Type | Smooth shaft, 28 mm diameter, with keyway (DIN 6885-1) |
| Operating Temperature | -10°C to +45°C |
| Duty Cycle | Continuous (S1) |
| Efficiency | > 90% at rated point |
Functional Features:
- Multi-turn absolute encoder: retains position after power loss
- High overload capacity: 3× rated torque for 1 second
- Sealed design: IP65, suitable for washdown environments
- Baldor-compatible mount pattern (NEMA 42 equivalent)
- Thermal protection: PTC thermistors in windings
- Holding brake: available as option (24 VDC, 10 Nm)
Performance Parameters:
| Parameter | Value |
|---|---|
| Torque Constant (Kt) | 1.34 Nm/A |
| Back-EMF Constant (Ke) | 134 V/krpm |
| Rotor Inertia | 6.2 × 10⁻⁴ kg·m² |
| Mechanical Time Constant | 28 ms |
| Electrical Time Constant | 4.2 ms |
| Thermal Resistance (Rth) | 1.8 K/W |
| Max Axial Load | 150 N |
| Max Radial Load | 450 N |
Material Composition:
- Housing: Cast iron (GJL-250), epoxy coated
- Shaft: Hardened alloy steel (42CrMo4, ground and polished)
- Magnets: NdFeB N42UH, 150°C grade
- Windings: Copper, Class F/H insulation (VPI processed)
- Bearings: SKF or NSK angular contact ball bearings (sealed, greased for life)
- Connector: M23 17-pin
Structural Features:
- 4× M8 mounting holes on 95 mm bolt circle (NEMA 42 pattern)
- 28 mm smooth shaft with keyway
- M23 connector on drive end
- Lifting eye on top of housing
Applicable Industries:
- Metal cutting CNC machines
- Press feed systems
- Heavy-duty conveyor drives
- Plastic injection molding (clamp unit)
- Printing press main drives
Installation Requirements:
- Mount with 4× M8 screws, torque to 25 Nm
- Use rigid coupling (no flexible coupling — shaft is 28 mm)
- Cable entry: M23 cable gland, torque to 10 Nm
- Verify encoder resolution matches drive configuration
- Align shaft to load within 0.03 mm TIR
Usage Precautions:
- Do not exceed 4,500 RPM
- Do not apply axial loads > 150 N
- Do not operate above +45°C ambient
- Do not remove holding brake (if installed) without authorizing procedure
- Lubricate bearings only with specified grease (if not sealed-for-life)
