Lafert Preferred-series low-inertia brushless servo motor. Published electrical and mechanical figures retain the manufacturer’s stated winding-temperature and variant conditions.
Standard specifications
| Product model | B64.06J |
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| Motor type | AC_servo |
| Rated voltage | 400 V AC |
| Rated power | 2,200 W (2.2 kW) |
| Rated torque | 4.7 Nm (at winding temperature rise Δt = 105 °C) |
| Peak torque | 26 Nm |
| Rated speed | 4,500 rpm |
| Peak speed | 6,600 rpm |
| Rated current | 4.3 Arms |
| Peak current | 35 Arms |
| Torque constant | 1.09 Nm/A |
| Rotor inertia | 8.83 kg·cm² (manufacturer value 8.83 × 10^-4 kg·m²; converted units) |
| Ingress protection | IP65 |
| Phase resistance | 1.82 Ω phase-to-phase at 20 °C |
| Phase inductance | 8.5 mH phase-to-phase |
| Weight | 8.6 kg |
| Dimensions | B64J frame: 116 mm square flange; maximum length 168 mm for resolver/encoder variants; centering Ø110 j6; bolt circle Ø130; shaft Ø19 k6 × 40 mm |
| Motor length | 168 mm maximum for resolver/encoder variants |
| Flange | B64J square flange, 116 mm |
| Cooling method | Radiation and natural convection |
| Pole pairs | 5 pole pairs (manufacturer specifies 10 poles) |
Source-specific technical extensions
| Technical extension parameters | Stall torque 6 Nm at Δt = 105 °C; rotor inertia 8.83 × 10^-4 kg·m² (also mapped with unit conversion); peak-torque acceleration 37,371 rad/s²; thermal time constant 31 min; voltage constant 0.63 V·s; B.E.M.F. 296 Vrms at rated speed; stall current 5.5 Arms; connector size 7/1; thermal protection threshold 140 °C. Encoder/resolver variants exist; no single feedback option or communication protocol is asserted. |
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English manufacturer source: https://www.lafert.com/en/prodotti/3/brushless-servo-motors/15/servo-motors-preferred/104079/B64.06J
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