Page 241 - Renewable Energy Devices and System with Simulations in MATLAB and ANSYS

228 Renewable Energy Devices and Systems with Simulations in MATLAB and ANSYS ®
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Stator core
Dext
Permanent magnet
B 1 =0.61 T, Hc =460 kA/m Air gap
Coil
Stator
Stator
PM
Rotor pole
Stator coil
Pole leg

Pole shoe
Shaft

Rotor
Dint
(a) (b)

Outer stator lamination

Coil
PM

Inner stator lamination Ring rotor lamination
(c)

FIGURE 9.17 Flux reversal tooth-wound coil PMSG: (a) axial air-gap flux reversal machine, with IPM rotor,
(b) tooth-wound axial air-gap IPMSM, and (c) radial-air-gap flux reversal machine, with IPM rotor.

Excitation
zone
Torque zone
Phase
current
B C D E
A F Excitation Torque level
A΄ level
Electrical
deg.
0 306090 120 150 180 210 240 270 300 330 360

Excitation Excitation
zone Torque zone zone Torque zone

FIGURE 9.18 Brushless DC multiphase reluctance machine—basic structure and phase current in the windings.