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Kollmorgen B-206-D-91-018
Product Overview:
The B-206-D-91-018 is a spring-applied, electrically-released electromagnetic brake manufactured by Kollmorgen. It is designed to provide fail-safe holding torque in vertical-axis applications where the load must be held in position when power is removed. The brake is typically mounted on the rear shaft of a Kollmorgen AKM or AKM22 servo motor (or compatible motor) to prevent uncontrolled descent during power loss or emergency stop.
Detailed content
Technical Specifications:
| Parameter | Value |
|---|---|
| Brake Type | Spring-Applied, Electrically-Released (Fail-Safe) |
| Holding Torque | 0.6 Nm (5.3 lb-in) minimum |
| Release Voltage | 24 VDC (nominal) |
| Release Current | 0.15 A (at 24 VDC) |
| Power Consumption (held released) | 3.6 W |
| Response Time (release) | ≤ 30 ms |
| Response Time (engage) | ≤ 20 ms |
| Operating Temperature | -10°C to +50°C |
| Duty Cycle | 100% (continuous holding) |
| Mounting Interface | Bore mount to motor shaft (compatible with AKM22 8 mm bore and AKM 10 mm bore variants) |
| Weight (approx.) | 45 g (0.10 lb) |
| Enclosure Rating | IP40 (when mounted on motor) |
| Insulation Class | Class F (155°C) |
Functional Features:
- Fail-safe operation: Spring forces brake engaged when power is removed — load is held without power
- Quick release: 30 ms release time enables fast motion start
- Low power consumption: Only 3.6 W when released
- Friction material: Non-asbestos organic compound for consistent torque and low wear
- Manual release: Manual release lever/screw for maintenance positioning
- Wear indicator: Mechanical wear indicator accessible from outside
Structural Characteristics:
- Housing: Zinc-plated steel for corrosion resistance
- Friction Disc: Organic friction material bonded to steel plate
- Armature Plate: Laminated steel with copper release coil
- Return Spring: High-fatigue steel spring providing holding force
- Bore: Precision-machined bore for press-fit or set-screw mounting to motor shaft
- Wiring: Flying leads (200 mm) with 24 VDC connector
Working Principle:
When 24 VDC is applied to the brake coil, the electromagnetic field pulls the armature plate against the spring force, compressing the return spring and releasing the friction disc — the motor shaft is free to rotate. When power is removed, the spring force pushes the armature plate back, clamping the friction disc against the housing, creating friction torque that holds the shaft stationary. The holding torque of 0.6 Nm minimum is maintained indefinitely without power.
Advantages:
- Fail-safe by design — no power required to hold load
- Compact and lightweight — 45 g adds minimal inertia to motor
- Fast response — 30 ms release enables high-dynamic applications
- Low heat generation — 3.6 W power consumption
- Long service life — organic friction material rated for >1 million cycles
Applicable Industries:
- Vertical-axis robots (Z-axis)
- Elevator and lift systems
- Hoists and cranes
- Conveyor incline/decline sections
- Medical imaging equipment (CT/MRI gantries)
- Antenna positioning systems
Installation Requirements:
- Mount directly on motor rear shaft using press-fit (H7 tolerance) or set screw (M3 × 0.5)
- Alignment tolerance: ≤ 0.05 mm axial runout, ≤ 0.1 mm radial runout
- Wire brake coil to 24 VDC supply with flyback diode (Kollmorgen provides integrated diode in some variants — verify)
- Connect brake release signal to drive brake output terminal or PLC digital output
- Ensure brake engages before motor is powered — sequence: Brake ON → Motor powered → Brake released → Motion
Usage Precautions:
- Never operate motor without brake engaged when stationary on vertical axis — uncontrolled descent will occur
- Do not exceed 50°C ambient — friction material degrades above rated temperature
- Check wear indicator regularly — replace brake when friction material reaches minimum thickness (1.5 mm)
- Do not apply voltage above 28 VDC — coil insulation damage risk
- Manual release must be re-engaged after maintenance before powering the system
- Brake must be released before attempting to rotate motor — forced rotation with brake engaged will damage friction surfaces
