Page 562 - Mechanical Engineers' Handbook (Volume 2)
P. 562
3 Direct-Current Servomotors 553
Figure 6 Cross section of typical brushless dc motors: (a) inner rotor–outer stator type; (b) inner
stator–outer rotor type. (From Ref. 5.)
Table 4 Brushless dc Motor Performance Data
Peak Electrical Mechanical Torque/Inertia
Magnet Power Torque Time Constant Time Constant ratio
2
Type (W) (in. oz) (s) (s) (rad/s )
Ceramic 25–900 10–600 0.0002–0.0016 0.0221–0.7400 413–11,400
AlNiCo 20–280 6–5,000 0.0001–0.0030 0.0065–0.1330 465–57,500
Rare earth 25–6000 10–316,000 0.0001–0.0140 0.0024–0.0291 137–100,000
