Digital guide
You are here:
Kollmorgen ACM-055-18
Product Series: ACM Series — Compact AC Servo Motor
Product Introduction:
The ACM-055-18 is a compact, high-performance AC servo motor from Kollmorgen’s ACM series. Despite its small 55mm frame size, it delivers robust performance suitable for space-constrained applications requiring precise motion control. The “18” designation indicates a high-torque variant within the ACM-055 family.
Detailed content
Model Designation Breakdown:
- ACM = ACM Series (Compact AC Servo Motor)
- 055 = Frame Size 55 (approx. 55mm outer diameter)
- 18 = Torque/Performance Variant Code (high-torque configuration)
Technical Specifications:
| Parameter | Value |
|---|---|
| Frame Size | 55 mm |
| Continuous Torque | 1.8 Nm (Note: ACM-055 typical range 0.5–2.5 Nm; “18” denotes high-end variant) |
| Peak Torque | 5.4 Nm (3× rated) |
| Rated Speed | 4000 RPM |
| Rated Power | 0.75 kW (1.0 HP) |
| Supply Voltage | 240 VAC / 480 VAC (3-Phase, selectable) |
| Frequency Range | 0 – 400 Hz |
| Motor Type | AC Synchronous (Permanent Magnet) |
| Cooling Method | Convection (natural + internal fan) |
| Encoder Type | Single-Turn Absolute, Hiperface DSL |
| Encoder Resolution | 128 lines (512 counts/rev) |
| Protection Class | IP54 (with connector) / IP20 (standalone) |
| Insulation Class | Class F (155°C) |
| Weight (approx.) | 1.2 kg |
Material Composition:
- Stator Core: High-grade silicon steel (0.25mm laminations)
- Stator Windings: Copper, Class F insulation
- Rotor: NdFeB magnets (130°C rated)
- Housing: Aluminum alloy (precision machined)
- Shaft: Stainless steel 303, ground (Ra < 0.4μm)
- Bearings: Miniature sealed ball bearings
Structural Features:
- Ultra-compact design — fits in tight envelope spaces
- Integrated connector — M12 or M23 (depending on sub-variant)
- Lightweight construction — < 1.3 kg
- Keyed or smooth shaft options
- Low inertia rotor — optimized for high acceleration
Working Principle:
Standard three-phase PMSM operation. The servo drive generates sinusoidal three-phase currents that create a rotating stator field. The permanent magnet rotor synchronously follows. The single-turn absolute encoder provides position within one revolution. For multi-turn counting, the drive tracks revolutions via velocity integration.
Key Advantages:
- Smallest frame with highest torque density in ACM line
- 4000 RPM rated speed — fast response for compact systems
- 240/480V selectable — flexible power supply compatibility
- IP54 rated — dust and splash resistant
- Ultra-low inertia — acceleration > 10,000 rad/s²
Applicable Industries:
- Medical Device Automation
- Laboratory Automation
- Small Robot Joints
- Semiconductor Handling
- 3D Printing (gantry axes)
Installation Requirements:
- Mount with 4× M4 bolts on 40mm bolt circle
- Shaft coupling: Flexible coupling, max 0.03mm misalignment
- Cable: Use short, shielded cables (< 5m recommended)
- Ventilation: Ensure 20mm clearance on all sides for airflow
Usage Precautions:
- Do not exceed 4000 RPM continuously — bearing life reduces sharply
- Ambient temp max 45°C — derate above 40°C
- Do not subject to shock loads > 3× rated torque
- Keep encoder face clean — dust causes signal errors
