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Kollmorgen BB-206-D-91-08
Product Overview
BB-206-D-91-08 is a mid-frame low-inertia AC brushless servo motor manufactured by Kollmorgen, designed for closed-loop high-precision motion control systems. The model suffix BB-206 denotes frame size 206 standard B-series stator stack; D defines winding voltage grade; 91 stands for feedback encoder configuration; 08 represents mechanical shaft, brake and connector assembly options.
Detailed content
Technical & Performance Specifications
- Rated Input Voltage: 230 VAC Single/Three Phase
- Continuous Stall Torque: 6.2 N·m
- Peak Overload Torque: 18.6 N·m (300% continuous torque, sustainable 5s)
- Rated Operating Speed: 3000 RPM
- Maximum Mechanical Speed: 6000 RPM
- Rotor Moment of Inertia: 0.00086 kg·m²
- Insulation Class: Class F (155°C thermal withstand)
- Winding Thermal Time Constant: 32 mins
- Encoder Feedback: 2500 line incremental sine/cosine encoder (91 suffix specification)
- Brake Configuration: 24VDC electromagnetic holding brake (08 suffix integrated brake)
- Shaft Type: Standard smooth cylindrical output shaft
- Weight: 7.8 kg
Material Composition
- Stator Housing: Die-cast aluminum alloy with black anodized anti-corrosion coating
- Rotor Core: Laminated silicon steel stack bonded with high-temperature epoxy
- Permanent Magnet: High-energy NdFeB rare-earth magnet surface-mounted rotor design
- Bearing Pair: Double sealed high-precision radial ball bearings (SKF OEM)
- Terminal Connector: Nickel-plated copper pin D-Sub industrial connector with silicone sealing gasket
- Brake Friction Disc: Carbon composite wear-resistant friction material
Structural Features
- Fully sealed integrated stator-winding assembly via Vacuum Pressure Impregnation (VPI) process
- Dual-bearing cantilever support structure to eliminate radial shaft runout
- Axial forced convection heat dissipation fins machined on outer housing
- Rear-side encoder housing fully isolated from power windings to suppress electromagnetic interference
- Mounting flange conforms to IEC standard NEMA 206 frame dimensional norm
- Separate dedicated wiring port for brake power circuit
Working Principle
Operates on three-phase sinusoidal field-oriented vector control. The servo drive outputs modulated three-phase AC current to stator windings, generating rotating electromagnetic flux. Surface-mounted NdFeB permanent magnets on rotor interact with stator flux to produce continuous rotational torque. The rear-mounted incremental encoder transmits real-time rotor position and velocity feedback signals back to servo drive, forming full closed-loop torque/velocity/position triple-loop regulation to eliminate tracking error dynamically. The integrated 24VDC brake engages automatically when drive enable signal cuts off, locking rotor shaft mechanically without external holding power.
Function Features
- Ultra-low cogging torque (≤1.2% rated torque) for zero-jitter low-speed operation
- 300% peak torque overload capacity for rapid acceleration/deceleration cycles
- VPI winding technology eliminates inter-turn short circuit risk under continuous high-load operation
- Built-in thermistor winding temperature monitoring signal output for drive overheat protection interlock
- Isolated encoder signal wiring channel to reject industrial EMI noise
- Quick-release D-Sub connector design for fast field disassembly and maintenance
- Electromagnetic brake with zero-backlash mechanical locking for static load retention
Advantage Highlights
- Low rotor inertia delivers sub-10ms full speed acceleration response
- Anodized aluminum housing reduces operational heat buildup by 22% vs cast iron frame motors
- Standardized NEMA flange enables direct drop-in replacement for legacy B-series motor models
- Dual-sealed bearing assembly extends service life to 40,000 operating hours under rated load
- Compatible with all Kollmorgen digital servo drives without custom parameter tuning
- RoHS, CE, UL/cUL certified for global industrial deployment
Applicable Industries
Precision CNC machining equipment, automated assembly workcells, textile looms, packaging machinery, printing press registration axes, semiconductor wafer handling stages, medical diagnostic motion platforms, robotic joint auxiliary axes
Installation Requirements
- Mounting Orientation: Any horizontal/vertical orientation; vertical mounting requires bottom drain hole plug installed to prevent moisture ingress
- Flange Fastening: Use Grade 8.8 M8 hex socket bolts with 25 N·m uniform tightening torque; apply spring lock washers for anti-loosening
- Shaft Coupling Alignment: Radial runout tolerance ≤0.03mm; axial misalignment ≤0.05mm to avoid bearing premature failure
- Cable Separation: Power motor cable and encoder feedback cable maintain minimum 20cm physical separation; cross routing must use 90-degree perpendicular crossing only
- Heat Dissipation Clearance: Minimum 80mm unobstructed airflow space surrounding motor housing fins
- Ground Specification: Motor housing protective earth terminal connected to cabinet star ground via ≥4mm² copper shield cable
Operation & Maintenance Precautions
- Ambient operating temperature range strictly limited to -5°C ~ +40°C; above 40°C apply linear 6% power derate per 10°C temperature rise
- Operating altitude maximum 1000m above sea level; altitude exceeding 1000m requires 6% continuous torque derate per 1000m elevation increase
- Relative humidity environment ≤85% non-condensing; prohibit deployment in corrosive gas, oil mist or conductive dust atmospheres
- Do not apply radial impact load directly to output shaft during installation; use soft jaw flexible couplings only
- Brake power supply must maintain regulated 24VDC ±10%; voltage deviation exceeding range causes incomplete brake release or permanent friction disc wear
- Conduct bearing grease replenishment every 20,000 operating hours via rear grease fitting port
- Cut all drive power supply before disconnecting encoder or motor power connectors to eliminate electrostatic discharge damage to encoder chip
