18 Special-Purpose Electric Machine.

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Presentation transcript:

18 Special-Purpose Electric Machine

Figure 18.1(a) Two-pole brushless DC motor with three-phase stator winding

Figure 18.3 Transistor and SCR drives for a brushless DC motor Variable DC supply T 4 a b c Stator a' c' b' 1 5 2 6 3 Transistor supply for brushless DC motor + _ Vari able S SCR supply for brushless DC motor

Figure 18.4 Phase voltages and transistor (SCR) switching sequences for the brushless DC motor drive of Figure 18.3 T 2 1 3 4 5 6 1 = Transistor on 0 = Transistor off 60 120 180 240 300 360 Electrical degrees Phase-to-phase stator voltage V a-b b-c c-a

Figure 18.5 Performance and efficiency characteristics of brushless DC motor Speed, rev/min 100 150 200 250 300 350 400 50 500 Efficiency Curve 475 407 339 272 204 136 68 80% 85% 90% 94% (b) 1000 1500 2000 2500 Performance Curve (a) Torque, lb-ft Torque, Nm

Figure 18.8 Stepping motor configurations (a) Permanent-mag net stepping motor (b) Variable-reluctance (c) Hybrid stepping motor Torque