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Kollmorgen B-604-G-99-G-2
Product Introduction:
The B-604-G-99-G-2 is an economy-class AC servo motor from Kollmorgen’s B-Series product line. It is designed for cost-sensitive applications that still require reliable servo performance. The model number decodes as: B (B-Series), 604 (frame size: ~60 mm OD), G (winding code), 99 (feedback variant), G (shaft variant), 2 (revision). This motor offers solid performance at a lower price point compared to M, S, or AKD-paired motors.
Detailed content
Technical Specifications:
| Parameter | Value |
|---|---|
| Frame Size | B-604 (NEMA 17 equivalent) |
| Stator Outer Diameter | 60 mm (approx.) |
| Stack Length | 04 (standard for B-604) |
| Rated Torque (Continuous) | 0.65 Nm |
| Peak Torque | 1.95 Nm (3× rated, 10 s) |
| Rated Speed | 3000 RPM (continuous) |
| Max Speed | 5000 RPM |
| Rated Power (Continuous) | ~200 W |
| Winding Code | G (Rated voltage: 200–480 V AC) |
| Feedback Device | Incremental encoder (A/B/Z, 2500 lines, TTL) |
| Holding Brake | No (G = without brake in this variant) |
| Insulation Class | Class B (130°C) or Class F (155°C) — verify variant |
| IP Rating | IP54 (standard) / IP65 (with seal kit) |
| Weight | ~0.65 kg |
| Shaft Type | G-2: Keyed shaft with D-cut, 8 mm diameter |
| Bearings | Deep groove ball bearings (sealed) |
| Cooling | IC411 (self-ventilated) |
Structural Characteristics:
- Aluminum housing with pressed steel end caps
- Ferrite magnets (Ceramic) — lower cost than rare-earth, adequate for this torque class
- 24 slots / 4 poles stator configuration
- Standard incremental encoder — 2500 lines/rev (10,000 counts/rev with quadrature)
- M12 connector for encoder and power
- Keyed shaft with D-cut for positive drive connection
Performance Parameters:
| Parameter | Value |
|---|---|
| Torque Constant (Kt) | 0.22 Nm/A (typical) |
| Back-EMF Constant (Ke) | 2.1 V/krpm (typical) |
| Rotor Inertia | ~3.5 × 10⁻⁶ kg·m² |
| Mechanical Time Constant | ~5 ms |
| Electrical Time Constant | ~3 ms |
| Torque-to-Inertia Ratio | ~186 Nm/kg·m² |
Advantages:
- Lowest cost entry point into Kollmorgen servo ecosystem
- Compact NEMA 17 form factor — fits most standard mounts
- High speed capability (5000 RPM) for its size
- Compatible with S200 and AKD drives — full Kollmorgen ecosystem support
- Ferrite magnets — no rare-earth supply chain risk
Applicable Industries:
Small CNC routers, 3D printers, light conveyor systems, small pick-and-place, laboratory automation, textile machines (single axis), door/gate operators
Installation Requirements:
- Mount using 2× M4 mounting holes on rear flange (NEMA 17 pattern)
- Shaft coupling: Flexible coupling recommended — max misalignment: 0.05 mm radial, 0.05° angular
- Encoder cable: Shielded twisted pair, minimum bend radius 40 mm
- Do not apply axial load > 20 N on shaft
- M12 connector torque: 2 Nm max
Usage Notes:
- Do not exceed 5000 RPM — ferrite magnets have lower thermal tolerance than SmCo/NdFeB
- This motor has NO brake — use drive braking or external brake if load retention is needed
- Incremental encoder requires homing on every power-up — configure index (Z) pulse search in drive
- Derate torque 2% per °C above 40°C ambient (ferrite magnets are more temperature-sensitive)
- Use Kollmorgen Workbench for commissioning — select B-Series motor profile for auto-tuning
