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Product Introduction:
The PMA230-1050B-02 is a high-torque-density frameless AC servo motor designed for direct-drive applications where the motor is integrated directly into the mechanical structure, eliminating the need for couplings, gearboxes, or bearings. The hollow-shaft design allows wiring and cabling to pass through the center of the rotor.
Technical Specifications:
| Parameter | Value |
|---|---|
| Outer Diameter (OD) | 230 mm (9.06 in) |
| Stack Length | 105 mm (4.13 in) |
| Continuous Torque | 16.5 Nm (146 lb-in) |
| Peak Torque | 49.5 Nm (438 lb-in) |
| Max Speed (Continuous) | 3,000 RPM |
| Peak Speed | 4,500 RPM |
| Rated Power (Continuous) | 5.2 kW (6.97 HP) |
| Peak Power | 15.6 kW (20.9 HP) |
| Voltage Rating | 200–480 VAC (3-Phase) |
| Winding Configuration | Delta / Wye selectable |
| Hollow Bore Diameter | 90 mm (3.54 in) |
| Thermal Resistance (Rth) | 0.45 °C/W (housing to ambient) |
| Weight | Approx. 12.5 kg (27.6 lbs) |
| Insulation Class | Class H (180°C) |
| IP Rating | IP65 (with optional sealing kit) |
| Encoder Option (B-02) | Resolver — 12-bit absolute, Sine/Cosine output |
Structural Features:
- Frameless construction — No housing, no shaft, no bearings; motor is embedded into customer mechanical assembly.
- Hollow rotor design — Central bore for cable routing and shaft pass-through.
- Laminated stator core — Low-loss silicon steel laminations for reduced eddy current losses.
- Rare-earth permanent magnet rotor — High-energy NdFeB magnets for maximum torque density.
- Integral resolver feedback — Provides absolute position without battery backup.
Working Principle:
Three-phase AC current supplied to the stator windings generates a rotating magnetic field. The permanent magnet rotor locks to this field and rotates synchronously. The resolver mounted on the stator provides real-time rotor position feedback to the servo drive for closed-loop control.
Key Advantages:
- Zero backlash — Direct-drive eliminates mechanical transmission losses.
- Highest torque density in class — 16.5 Nm continuous in 230 mm OD.
- Cable-through hollow shaft — Simplifies system integration in rotary joints and gimbals.
- No maintenance bearings required — Customer supplies their own bearing system.
Applicable Industries:
Robotics (articulated joints), Antenna/radar positioning, Satellite gimbal systems, Semiconductor wafer handling, Medical imaging (CT/MRI gantries), Camera stabilization platforms.
Installation Requirements:
- Motor must be press-fit or bolted into a precision-machined housing.
- Customer must provide front and rear bearing support rated for full radial and axial loads.
- Alignment tolerance: ≤ 0.02 mm TIR on bore concentricity.
- Thermal interface: Use thermal compound or liquid cooling jacket for continuous operation above 70% rated torque.
Usage Precautions:
- Do not exceed 4,500 RPM under any condition — rotor integrity is compromised above this limit.
- Resolver cables must be shielded twisted-pair; route away from high-current power cables.
- Operate only with Kollmorgen AKD or AKM-compatible servo drives.
- Store in dry environment; NdFeB magnets are susceptible to corrosion if uncoated.
