Permanent magnet type rotating electric machine
A rotating motor and permanent magnet technology, applied to the magnetic circuit rotating parts, magnetic circuit shape/style/structure, magnetic circuit, etc., can solve the problem of deterioration of comprehensive operating efficiency and achieve the effect of suppressing magnetic saturation
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no. 1 Embodiment approach ）
[0046] (1-1. Structure)
[0047] use Figure 1 to Figure 5 A first embodiment of the present invention will be described. In addition, from the viewpoint of simplification, only one of the twelve poles is shown in each figure, but it goes without saying that the configuration of each pole is the same. In addition, in figure 1 The rotor and stator are shown in , but in figure 2 The stator part is omitted hereafter.
[0048] The rotor 1 according to the first embodiment of the present invention is as follows: figure 1 As shown, it includes rotor core 2 , permanent magnet 3 with smaller product of coercive force and thickness in magnetization direction, and permanent magnet 4 with larger product of coercive force and thickness in magnetization direction. The rotor core 2 is formed by laminating silicon steel plates, and the permanent magnets 3 and 4 are implanted in the rotor core 2 . Cavities 5, 6 are provided at the ends of the permanent magnets 3, 4, so that the magne...
no. 2 Embodiment approach ）
[0080] Image 6 It is a sectional view showing the rotor portion of the second embodiment of the present invention. In this second embodiment, the arrangement of the short-circuit coil 8 is different from that of the first embodiment. In the present embodiment, an axis extending along the magnetization direction of the central part of the permanent magnet (NdFeB magnet 4 ) other than the above-mentioned irreversibly changing permanent magnet (ferrite magnet 3 ) is taken as the central axis of the short-circuit coil 8 . The stator side of this “other permanent magnet” (NdFeB magnet 4 ) is provided with a short-circuit coil 8 . The short-circuit coil 8 faces the other permanent magnet (NdFeB magnet 4 ) with a gap therebetween, and is embedded in the rotor core 2 .
[0081] Also in the second embodiment having such a configuration, an induction current is induced in the short-circuit coil 8 by the magnetic field generated by the magnetizing current, as in the above-mentioned fi...
no. 3 Embodiment approach ）
[0084] Figure 7 (a) is a sectional view showing a rotor portion according to a third embodiment of the present invention, Figure 7 (b) is to Figure 7 (a) A partially enlarged view showing an enlarged part of the rotor core. This third embodiment is an embodiment in which a short-circuit coil is provided in a magnetic circuit portion where magnetic flux leaks, other than the “irreversibly variable permanent magnet” 3 of the rotor core 2 . exist Figure 7 As an example, in the radial direction of the portion where the "irreversibly variable permanent magnet" 3 of the rotor core 2 is installed, the short-circuit coil 8a is provided in the "magnetic circuit portion where the magnetic flux leaks" other than the permanent magnet 3 , 8b. That is, in the radial direction of the rotor core 2, the narrower parts of the core are formed between the cavities 5 provided at both ends of the "irreversibly variable permanent magnet" 3 and the outer and inner surfaces of the rotor core 2...
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