JP3906879B2 - Reluctance motor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a reluctance motor that uses reluctance torque among electric motors, and more particularly to a reluctance motor that can improve the mechanical strength of a rotor.
[0002]
[Prior art]
This type of reluctance motor includes, for example, a configuration shown in FIG. In FIG. 3, a rotor 3 having an arcuate slit 2 for generating reluctance torque is disposed in a stator 1 that generates a rotating magnetic field. The slit 2 is formed with the apex of the arc directed toward the center hole (for shaft) 4, and changes the magnetism by the rotating magnetic field of the stator 1 within the rotor 3, that is, makes the reluctance non-uniform.
[0003]
Specifically, when a difference between the q-axis and d-axis inductance (reluctance difference) is added, reluctance torque is generated, that is, rotational force is generated in the rotor 3. This difference in inductance, and magnetic path substantially perpendicularly interposed slits 2 (see dashed line arrow A in FIG. 3) of the other hand by the rotating magnetic field generated by the stator 1 (q-axis), the other (d-axis) caused by making the magnetic path intervening region where no slit 2 (see dashed line arrow B in FIG. 3) (the region was also included between the slits 2).
[0004]
The multi-layered slit 2 increases the difference between the q-axis and d-axis inductance, and a large reluctance torque is expected to be generated, so that a desired motor torque can be obtained.
[0005]
Note that FIG. 3 illustrates the case where the rotor 3 is formed with the slit 2 having a four-layer structure, but the same applies to the case of a multilayer structure having two or more layers.
[0006]
[Problems to be solved by the invention]
However, in the reluctance motor, since the slit 2 formed in the rotor 3 has an arc shape, it is difficult to make a multilayer structure considering the distance between the slit 2 and the center hole 4. That is, for example, the more the slits 2 are multi-layered, the smaller the distance between the slits 2 and the central hole 4, and the more problematic the mechanical strength of the rotor 3. As a specific example, when a core sheet laminated through a shaft through the center hole 4 is fixed, distortion or the like occurs in the core sheet.
[0007]
Further, in order to secure a sufficient magnetic path from the stator 1, if the slit 2 is formed in a shape along the magnetic path, the problem is related to the mechanical strength problem of the rotor 3 described above. It is difficult to make the slit 2 multilayer.
[0008]
The present invention has been made in view of the above problems, its object is also to multilayered slits for generating reluctance torque, it is possible to improve the mechanical strength of the rotor, yet the motor characteristics An object of the present invention is to provide a reluctance motor in which (mainly toe characteristics) need not be changed.
[0009]
[Means for Solving the Problems]
To achieve the above object, the present invention provides a reluctance motor having a rotor in a stator for generating a rotating magnetic field, in order to generate a re reluctance torque, the multi-layer along a radial direction of the rotor as bathtub curve shape inclined sides bottom flat each slit of the multilayer structure is arcuate that will be formed, the bottom portion of each slit is disposed towards the central hole for the shaft insertion, and each of the multilayer structure The slits are formed at substantially equal intervals along the circumferential direction of the rotor.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to FIG. 1 and FIG. In the figure, the same parts as those in FIG.
[0011]
In the reluctance motor of the present invention, when the slit formed in the rotor has a substantially bathtub curve shape, the distance to the center hole can be secured in a predetermined manner, and a magnetic path from the stator can be secured, The focus is on the fact that the mechanical strength of the rotor can be improved also by making the slits multi-layered, and it does not affect the generation of reluctance torque (the motor characteristics do not change).
[0012]
Therefore, as shown in Reference Example in FIG. 1, the rotor 10 of the reluctance motor has a slit 11 similarly four-layer structure and FIG. 3, the slit 11 is Busta Bed shape, this Busta Bed shape of the bottom portion is formed at a position toward the center hole 4, formed at equal intervals in the circumferential direction of the rotor 10 by the number of poles. As described above, since the apex portion of the slit 11 has a flat shape, the distance to the center hole 4 can be taken to a necessary degree even if the slit 11 is multilayered, that is, the rotation having the slit 2 having the conventional multilayer structure. Compared with the child 3, the mechanical strength of the rotor 10 can be improved.
[0013]
Further, in FIG. 1, (see broken line arrow C in the drawing) slits 11 are interposed magnetic path of the stator 1 with respect to the q-axis, the magnetic road bathtub curve shape of the stator 1 with respect to d-axis It is formed in the rotor 10 within the substantially along (see dashed line arrow D in the figure). Therefore, the difference between the q-axis and d-axis inductance is large, and reluctance torque similar to the conventional one can be generated (conventional motor characteristics can be maintained). Further, since the slit 11 is Busta Bed shape, the center of the rotor 10, approximately the boss portion of the square is formed, through a caulking pin, which will be described later in this boss portion, it is possible to form the crimped portion.
[0014]
By the way, in manufacture of the rotor 10, the core lamination system (automatic lamination system) which punches an electromagnetic steel plate with an automatic press using a core press metal mold | die, and caulks in a metal mold | die integrally is employ | adopted. In this pressing process, the center hole 4 and the bathtub-curved slit 11 are punched out and automatically pressed and laminated to form the rotor 10.
[0015]
This reluctance motor has three-phase (U-phase, V-phase and W-phase) armature windings on a 24-slot stator 1, for example, an outer-side winding is a U-phase and an inner-side winding. Although the wire is the W phase and the intermediate winding is the V phase, the number of slots and the number of armature windings may be different.
[0016]
FIG. 2 is a schematic plan view of the reluctance motor according to the embodiment of the present invention . In the figure, the same parts as those in FIG.
[0017]
In the present invention the example of FIG. 2, the rotor 20, the slit 21 of approximately bathtub curve shape of the inclined sides of Busta Bed shape and an arcuate slit 11 is formed in the reference example shown in FIG. In other words, the slit 21 has a shape in which the apex portion of the slit 2 shown in FIG. 3 is flattened.
[0018]
In this case, similarly to the reference example shown in FIG. 1, even if the slit 21 has a multilayer structure, the distance between the center hole 4 and the apex portion of the slit 21 can be taken to a necessary degree. The mechanical strength of the rotor 20 can be improved compared to the rotor 3 having two.
[0019]
Further, (see dashed line arrow E in FIG. 2) slits 21 are interposed magnetic path of the stator 1 with respect to the q-axis, and the inclined sides of the slit 21 (inclined sides of bathtub curve) and arcuate, i.e. stator from the fact that the shape along the magnetic path of the 1, it is possible to secure than the form of the reference example shown the magnetic path of the stator 1 in Figure 1 with respect to d-axis (dashed line in FIG. 2 (See arrow F). Therefore, the generation of reluctance torque can be made more reliable and the generation of reluctance torque can be expected more.
[0020]
It is obvious that other effects can be obtained in the same manner as the reference example shown in FIG. Further, although in the form of implementation described above has been described slits of four-layer structure, it is clear that it can be applied to a two-layer or more structure.
[0021]
【The invention's effect】
As described above, according to the present invention, the reluctance motor having a rotor in a stator for generating a rotating magnetic field, formed in order to generate a re reluctance torque, the multi-layer along a radial direction of the rotor as bathtub curve shape inclined sides a flat bottom of each slit of the multilayer structure is arcuate that will be the bottom of the respective slits are arranged toward the center hole for the shaft insertion, and each slit of said multilayer structure by which is adapted to form at substantially equal intervals along the circumferential direction of the rotor and, even when the slits of the rotor to the multilayer, taking about requiring the distance between the at least slit and the central hole Therefore, the mechanical strength of the rotor can be improved. Moreover, since the magnetic path from the stator can be secured to the same extent as the arc-shaped slit by the bathtub-curved slit, it is useful that the motor characteristics (mainly the reluctance torque characteristics) need not be changed. effect is particularly added. Thus inflate the inclined sides of the Busta blanking shape slit as an arc-shaped, it is possible to secure a magnetic Paths from the stator, more generation of reluctance torque that expected, further effect is so.
[Brief description of the drawings]
FIG. 1 is a schematic plan view showing a reluctance motor as a reference example of the present invention.
2 is a schematic plan view showing a reluctance motor according to an embodiment of the present invention.
FIG. 3 is a schematic plan view of a conventional reluctance motor.
[Explanation of symbols]
1 Stator 4 Center hole (for shaft)
10, 20 Rotator 11 Bathtub shaped slit 21 Bathtub curved slit

Claims (1)

In reluctance motor having a rotor in a stator for generating a rotating magnetic field, in order to generate a re reluctance torque, the respective slits of the multilayer structure that will be formed in multiple layers in the radial direction of the rotor bottom flat As a bathtub curve shape in which both hypotenuses are arcuate, the bottom of each slit is arranged toward the central hole for shaft insertion, and each slit of the multilayer structure is arranged along the circumferential direction of the rotor A reluctance motor characterized by being formed at approximately equal intervals.

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