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Fig.1 2D mesh model of induction generator <\/p>\n<\/p><\/div>\n
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Fig.2 Partial detail of 2D mesh model of induction generator
The air gap region is divided into four layers.
The sliding surface is placed at the center of the slide.<\/p>\n<\/p><\/div>\n<\/div>\n
Fig. 3 shows the analytical results of the current variation in the primary stator winding when the rotor is not in motion (slip S=1). Negative times show the results of the AC steady-state analysis, while positive times show the results of the analysis using that as the initial value. The AC steady-state analysis is performed as a linear calculation by giving appropriate permeability. Although small oscillations are observed at the beginning of the transient analysis, it soon reaches a steady state and transients are no longer observed. In this analysis, starting from zero initial value, about 10 cycles are required to reach steady state. In Fig. 3, a nearly steady solution is obtained in the second period. Fig. 4 shows the rotational torque acting on the rotor, which also reaches near-stationarity in the second cycle. From Figs. 3 and 4, it can be seen that the primary winding current and average torque can be evaluated by AC analysis. <\/p>\n
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Fig.3 Current variation in the primary stator winding in case of no rotor rotation (slip S=1)<\/p>\n<\/p><\/div>\n
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Fig.4 Torque acting on the rotor (half) in case of no rotor rotation (slip S = 1)<\/p>\n<\/p><\/div>\n<\/div>\n
Figs. 5 and 6 show the results for a rotor speed of 1125 rpm and slip S = 0.25. In this case, the AC steady-state analysis shows a slightly lower primary winding current and higher average torque, but still reaches steady state in the second cycle of transient analysis. The result of the AC steady-state analysis depends on the input magnetic material linear permeability, which in this example does not seem to affect the transient analysis very much. <\/p>\n
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Fig.5 Current variation in stator primary winding in case of RPM 1125ppm with slip S=0.25<\/p>\n<\/p><\/div>\n
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Fig.6 Torque acting on the rotor (half) in case of RPM 1125ppm with slip S=0.25<\/p>\n<\/p><\/div>\n<\/div>\n
Figs. 7 and 8 show the magnetic flux density intensity and magnetic flux distribution in iron material. The magnetic flux is the amount of magnetic flux passing through the specified width in the z-direction (DELTA_Z=42mm). The magnetic field is oriented in the direction of the isomagnetic flux lines. It can be seen that the magnetic flux lines are normally continuous across the slide plane. Fig. 9 shows part of the flux density arrow diagram for the same case. Fig. 10 shows the current density variation in the primary winding and rotor bar. Although it may be difficult to understand because only one cycle is shown, it can be seen that the rotor rotates with a slip S = 0.25 slower than the rotation of the current distribution in the primary winding, and that the current in the rotor bar rotates at the same speed with almost the opposite phase of the primary current. <\/p>\n
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Fig.7 Magnetic flux density intensity distribution
(S=0.25, 0.04sec), unit $T$<\/p>\n<\/p><\/div>\n