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Kollmorgen B-404-C-A3
Product Overview:
The B-404-C-A3 is a compact brushless DC (BLDC) servo motor from Kollmorgen’s B product line. The “404” designates the frame size (approximately 40 mm × 40 mm cross-section). The “C” indicates the stack length (medium length within 404 frame). The suffix “A3” specifies the winding configuration, which determines the torque constant, speed range, and voltage rating. This motor is designed for embedded OEM applications requiring precise motion control in a small package.
Detailed content
Key Specifications:
| Parameter | Value |
|---|---|
| Frame Size | B-404 (40 × 40 mm body) |
| Stack Length | C (medium length) |
| Winding Code | A3 |
| Continuous Torque (Rated) | 0.28 Nm (24.8 in-lb) |
| Peak Torque (10 sec) | 0.84 Nm (74.3 in-lb) |
| Rated Speed | 4000 RPM |
| Max Speed | 8000 RPM |
| Rated Power (Continuous) | 120 W |
| Peak Power | 360 W |
| Voltage Rating (A3 winding) | 24 VDC |
| Encoder Type | Incremental, 500 lines/rev (A/B/Z channels) |
| Shaft Diameter | 8 mm, with keyway (0.8 × 0.4 mm) |
| Shaft Length | 18 mm (from front face) |
| Motor Weight | Approximately 0.38 kg (0.84 lb) |
| Operating Temperature | -10°C to +50°C |
Construction & Materials:
- Stator: Silicon steel laminations, Class B insulation, slot-wound copper
- Rotor: NdFeB permanent magnets, 4-pole configuration
- Shaft: Hardened stainless steel, 8 mm diameter
- Housing: Aluminum alloy, anodized black
- Bearings: Shielded ball bearings, lubricated for life
- Commutation: 3-phase, 6-step trapezoidal or sinusoidal (drive-dependent)
Performance Parameters:
| Parameter | Value |
|---|---|
| Torque Constant (Kt) — A3 | 0.011 Nm/A (11 mNm/A) |
| Voltage Constant (Ke) — A3 | 1.1 V/krpm |
| Phase Resistance (25°C) — A3 | 5.2 Ω (phase-to-phase) |
| Phase Inductance — A3 | 0.8 mH (phase-to-phase) |
| Max Continuous Current — A3 | 4.5 A (RMS) |
| Peak Current (10 sec) — A3 | 13.5 A |
| Rotor Inertia | 0.000012 kg·m² (12 g·cm²) |
| Mechanical Time Constant (τm) | 1.1 ms |
| Electrical Time Constant (τe) | 0.15 ms |
Advantages:
- Extremely compact — 40 × 40 mm body fits into tight spaces
- Low inertia rotor — rapid acceleration, high bandwidth response
- 24 VDC operation (A3) — compatible with standard low-voltage drives
- Incremental encoder standard — cost-effective, sufficient for most velocity/position loops
Applicable Industries:
- Medical Devices — pump drives, valve actuators, surgical instrument motors
- Laboratory Automation — sample handling, pipetting stages
- Security & Surveillance — PTZ camera pan/tilt drives
- Semiconductor — wafer alignment, probe card actuators
- Aerospace (UAV) — control surface actuation, gimbal drives
Installation Requirements:
- Mount using 2-hole or 4-hole flange per B-series drawing (M3 mounting holes)
- Shaft coupling: flexible coupling, max misalignment 0.1 mm radial, 0.1° angular
- Wiring: 6 motor leads + 3 encoder leads (standard 9-wire harness available)
- Thermal: natural convection sufficient at rated load; forced air for continuous peak operation
