Product Type: Frameless Brushless DC Torque Motor (Direct-Drive)

Outer Diameter: 51.8 mm (2.04 inch)

Inner Diameter (Bore): 25.4 mm (1.00 inch)

Stack Length (Active Length): 25.4 mm (1.00 inch) — C Variant

Overall Length (with Flange): 38.1 mm (1.50 inch)

Continuous Torque: 0.42 Nm (at 25°C case temperature)

Peak Torque: 1.26 Nm (10-second duty cycle, 25°C case)

Torque Constant (Kt): 0.13 Nm/A (Typical)

Back-EMF Constant (Ke): 13.1 V/krpm (Typical)

Terminal Resistance (R): 1.8 Ω (at 25°C, Phase-to-Phase)

Terminal Inductance (L): 3.2 mH (Phase-to-Phase, 1 kHz)

Rated Voltage: 24 VDC (Nominal)

Max Voltage: 48 VDC (Absolute Maximum)

Continuous Current: 3.2 A RMS (per Phase)

Peak Current: 9.6 A RMS (per Phase, 10-second duty)

No-Load Speed (at 24V): 1832 RPM (Typical)

Mechanical Time Constant (τm): 4.8 ms (Typical)

Electrical Time Constant (τe): 1.78 ms (Typical)

Rotor Inertia: 0.000019 kg·m² (1.9 g·cm²)

Weight: Approx. 0.35 kg (Motor Only, No Flange Hardware)

Stator Construction: Ironless (Slotless) Winding, Cylindrical

Magnets: Neodymium (NdFeB), Sintered, N42SH Grade

Housing/Flange Material: Anodized Aluminum Alloy 6061-T6 (B3 Flange: 4-Bolt Square Pattern)

Bearing Interface: Press-Fit Bore for Customer-Supplied Bearings (25.4 mm ID)

Flange Mounting: B3 Configuration — 4x M3 Tapped Holes on 38.1 mm Bolt Circle

Thermal Resistance (Case to Ambient): 8.5 °C/W (Natural Convection)

Insulation Class: Class H (180°C)

Operating Temperature: -20°C to +80°C (Continuous)

Feedback Options (Customer-Mounted): Compatible with Kollmorgen 63032 Series Single-Turn Absolute Encoder, Hiperface DSL, Incremental Encoder (1024 lines/rev minimum)

Key Features:

• Frameless design enables direct integration into customer mechanical structure — zero backlash, zero coupling losses
• Ironless stator delivers zero cogging torque for sub-microradian smoothness
• Ultra-low rotor inertia (1.9 g·cm²) for highest bandwidth direct-drive applications
• B3 flange provides rigid, repeatable mounting for precision rotary stages
• Continuous torque rated at 25°C case temperature — derate linearly above 25°C at 0.8%/°C

Applicable Industries: Optical Gimbals, Antenna Pointing, Semiconductor Wafer Stages, Surgical Robots, Space Mechanisms, Gimbal Stabilization

Installation Requirements:

• Press-fit motor into customer housing bore with interference fit of 0.01–0.025 mm
• B3 flange bolts: 4x M3 x 0.5, torque to 0.5 Nm
• Mount encoder directly on motor shaft using collet or set-screw hub (6 mm bore typical)
• Ensure thermal path from motor case to heatsink for continuous operation above 1 A

Usage Notes:

• Do not exceed 48 VDC — insulation breakdown will occur
• Bearing selection is customer responsibility; recommended: angular contact ceramic hybrid bearings (e.g., Si3N4 balls)
• Do not apply axial load directly to shaft — use thrust bearing at non-drive end