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Kollmorgen AKM73P-ACC2GK0
Product Introduction:
The AKM73P-ACC2GK0 is a compact brushless DC servo motor from Kollmorgen’s AKM product family. The “73” denotes the 73mm frame size, “P” indicates an integrated holding brake, “ACC” specifies a multi-turn absolute encoder, “2” denotes the 2500 RPM speed rating, “G” indicates the winding variant, and “K0” specifies a keyed shaft output. This motor is designed for applications requiring failsafe holding when power is removed.
Detailed content
Model Designation Breakdown:
- AKM = AKM Series (Brushless Servo Motor)
- 73 = Frame Size 73mm
- P = With Holding Brake (Power-off brake)
- ACC = Multi-Turn Absolute Encoder
- 2 = Speed Rating: 2500 RPM
- G = Winding Code G (specific torque/speed curve)
- K0 = Shaft: Keyed, DIN 6885
Technical Specifications:
| Parameter | Value |
|---|---|
| Frame Size | 73 mm |
| Continuous Torque | 2.5 Nm |
| Peak Torque | 7.5 Nm (3× rated, 10s) |
| Rated Speed | 2500 RPM |
| Rated Power | 0.65 kW (0.87 HP) |
| Supply Voltage | 48 VDC (nominal), 36–60 VDC range |
| Motor Type | Brushless DC (BLDC) with sinusoidal commutation |
| Cooling Method | Convection (self-ventilated) |
| Encoder Type | Multi-Turn Absolute, BiSS-C / Hiperface |
| Encoder Resolution | 128 lines (512 counts/rev) |
| Holding Brake | Yes (spring-applied, electrically released) |
| Brake Torque | 5 Nm (minimum) |
| Brake Voltage | 24 VDC |
| Protection Class | IP65 (with connector) |
| Insulation Class | Class F (155°C) |
| Weight (approx.) | 1.8 kg (with brake) |
Material Composition:
- Stator Core: Silicon steel laminations (0.35mm)
- Stator Windings: Copper, Class F insulation, epoxy-potted
- Rotor: NdFeB permanent magnets (150°C rated)
- Housing: Aluminum alloy (die-cast, anodized)
- Shaft: Hardened stainless steel, keyed (DIN 6885-1, 4×4×18mm key)
- Brake: Spring-loaded friction brake with copper friction disc
- Bearings: Sealed ball bearings (lubricated for life)
Structural Features:
- Integrated holding brake — engages automatically on power loss
- Compact 73mm form factor — fits tight spaces
- Rear-shaft encoder — 12-pin M23 connector
- Keyed shaft — positive drive connection, no slip
- 4× mounting holes — M5 on 60mm bolt circle
Working Principle:
The AKM73P is a three-phase BLDC motor with sinusoidal commutation. The servo drive (e.g., AKD-B or AKMD series) generates three-phase sinusoidal currents that produce a rotating magnetic field. The permanent magnet rotor follows synchronously. The multi-turn absolute encoder provides position feedback. The holding brake is a spring-applied, electrically released mechanism: when 24VDC is applied, the brake releases; when power is removed, the spring clamps the shaft, holding the load in position without power.
Key Advantages:
- Failsafe holding brake — load stays in position during power failure
- 48V DC bus — safer than 480VAC, suitable for collaborative robots
- Multi-turn absolute encoder — no homing required
- Compact 73mm frame — high torque density (2.5 Nm)
- Keyed shaft — positive engagement, zero backlash
Applicable Industries:
- Collaborative Robots (cobots)
- AGV/AMR Drive Motors
- Medical Device Actuators
- Small Packaging Machines
- Solar Tracking Systems
Installation Requirements:
- Mount with 4× M5 bolts on 60mm bolt circle
- Shaft coupling: Flexible coupling, max 0.03mm misalignment
- Brake wiring: 24VDC to brake release (connect to drive brake output)
- Encoder cable: Shielded, max 10m (BiSS-C supports longer with repeater)
- Grounding: Motor frame to PE, < 1 Ω
Usage Precautions:
- Brake voltage must be 24VDC ± 10% — wrong voltage damages brake coil
- Do not rotate shaft while brake is engaged — brake wear and overheating
- Do not exceed 2500 RPM continuous — bearing life reduction
- Ambient temp max 45°C — derate above 40°C
- Brake release time: ~30ms — account for this in motion profile
