Figure 1 shows the stiffness torque for one-phase excitation and Figure
2 shows the stiffness torque for two-phase excitation. Figure 3 shows the
magnetic flux density distribution of the yoke with one-phase excitation
at the rotation angle of 5.5 degrees.
Figure 4 shows the magnetic flux density distribution of the yoke with
two-phase excitation at the rotation angle of 5.0 degrees. When 0.5 A is
applied, the maximum torque of 0.26 Nm is obtained at 5.5 degrees for one-phase
excitation and 0.27 Nm is obtained at 5.0 degrees for two-phase excitation.
The magnetic flux is concentrated at the inductor, and so the magnetic
flux density is high regardless of the excitation.
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