JPH02164247A - Multipolar reluctance motor - Google Patents

Abstract

PURPOSE:To enable making the capacity of a reluctance motor higher by forming a stator through arranging cores and V-connection coils under certain conditions and by forming a rotor through arranging magnetic poles made by laminating magnetic sheets on the outer peripheral face of a non-magnetic material. CONSTITUTION:To form a stator, three ring cores 20 each having a plurality of teeth 22 on the inner peripheral face are arranged axially around the same shaft center in the manner of electrically deviating 120 deg. from each other, two ring coils are interposed between the cores 20 around the same shaft center as that of the core 20, and the coils are connected with a V-connection and with a three-phase power supply. On the other hand, a rotor 30 surrounded by the cores 20 is formed when magnetic poles 31 made by circumferentially laminating many axially extending magnetic sheets are arranged equally in the circumferential direction on the outer peripheral face of a non-magnetic base material 32. In this case, the magnetic poles 31 composed of laminated magnetic sheets reduces an eddy current caused by axially passing magnetic fluxes to collect and pass the fluxes suitably.

Description

[Detailed Description of the Invention] ^ Industrial Application The present invention relates to a multi-polar reluctance motor, which is small in size and can obtain a large torque, and is intended to have a large capacity.

B. Summary of the Invention In the present invention, reluctance torque is generated in the rotor by a stator serving as an f48i element.

Moreover, the stator is composed of a toothed ring-shaped iron core and a wire-connected ring-shaped coil arranged under certain conditions in order to generate a rotating magnetic field, and the rotor is made of a ring-shaped non-magnetic material. It is constructed by arranging a magnetic pole made of laminated magnetic plates.

C. Conventional technology and its problems A reluctance smorph that utilizes reluctance torque has conventionally had a stator shown in FIGS. 3 to 5,
As shown in these figures, the yoke 1. Iron core 2. coil 3
．． There is a slot 4, the coil 3 is formed in a hexagonal shape, and the straight part thereof is fitted into the slot 4. This coil 3 is Y-connected and connected to a three-phase power source to generate a rotating magnetic field.

On the other hand, the rotor of a reluctance motor is generally a block made of a ferromagnetic material and has a structure with magnetic unevenness.

However, at present, this type of motor has only been manufactured with a small capacity.

This is because when the number of poles is increased to generate large torque, the excitation current increases and both power factor and efficiency decrease.As the number of poles increases, the number of slots also increases, making the machine extremely large. This is due to the fact that as the coil end portion increases, the body becomes larger and the copper loss also increases.

For this reason, the present inventor proposed the following stator (armature) as a completely new reluctance motor. here,
This new stator will be explained from its principle.

Figure 6 is made of a permanent magnet with NS poles for simplicity.
Fig. 7 shows the rotor 5 and stator 6 of the rod, and Fig. 6 -
■ Ring-shaped coils 7a, 7 shown in FIG. 8 in cross section
This shows an example where b is arranged in the circumferential direction of the stator. In FIG. 7, it is assumed that the magnetic flux passing through the teeth of the stator 6 by the two coils 7a and 7b is φ1φ2φ.

On the other hand, the coils 7a and 7b are wound clockwise from the U phase to the V phase, and are further wound clockwise from the W phase to the V phase, thereby supplying three-phase alternating current. In this way, the coils 7a and 7b create interlinkage magnetic fluxes φ and φ as shown in FIG. will occur. That is,
In the vector diagram shown in FIG. 10, voltage V is a vector from U to V, and voltage V is a vector from W to V. Then, if v=vo ωt, then v −−vo ωt (ωt 3π).

A magnetic flux φ interlinks with the coil 7a, and a magnetic flux φ interlinks with the coil 7b. is φ, = f vadt, φb − f vb
d t.

Therefore, φ,= f vadt= f vomcc+tdt='
CIG ((Ll t-π1ω In FIGS. 7 and 9, there is a relationship of φ1=φ, φ,=−φゎ, so φ2 becomes the following equation.

Therefore, φ1=50(act-□) ω In this way, the magnetic fluxes φ1φ2φ become magnetic fluxes that are shifted by 1π from each other.

As a result of the above, the three-phase AC shown in FIG.
By energizing a and 'Ib, the magnetic flux of each phase shifted by 120 degrees in electrical angle is generated in the stator as shown in FIG. This results in a magnetic pole shown as a rectangle.

Moreover, this magnetic pole is ta+ (bl (cl
As shown in the figure, it changes sequentially over time.

That is, as shown in FIG. 11, at time t, FIG. 12 (
al, time t2+cr FIG. 12 (bl, at time t3, the magnetic pole distribution state is as shown in FIG. 12 (cl).

In this Figure 12 (al (bl (c)), the symbol "
N''rsJ is the maximum magnetic field, rnnJrssJ is the medium magnetic field (maximum magnetic field Q, 866), rnJrsJ is the weak magnetic field (R
0.5) of the large magnetic field, respectively, and times #t, t
Figure 12 (al (bl fc)
(7) The magnetic pole changes in the pattern. This pattern is shown in Figure 12 (taking al as an example). , is the strength of the magnetic field at a point.The same is true for 12 points.In other words, if we find the strength of the magnetic field at any point y and expand it on the y-axis, we get a positive magnetic wave distribution (not perfect).

As a result of the above, magnetic poles are distributed in a sinusoidal manner in the circumferential direction of the stator 6, and as shown in FIG. .

Next, the excitation coil (ring-shaped coil) will be explained. When considering a core with a coil N wound around it as shown in Fig. 13, the air gap G between Fig. 13 (al and Fig. 13 fbl is the same, and the strength of the magnetic field required for the gap G of 4 is the same). Therefore, the magnetomotive force of the coil wound around each tooth is also the same.As a result, even if the number of teeth is different between Figure 13 (al) and Figure 13 (C1), the magnetomotive force of Figure 13 (tc+) is the same. By energizing the entire coil, the magnetomotive force becomes constant. That is, a desired magnetic field strength can be obtained with one coil.

The specific structure of the stator based on this principle is shown in FIGS. 14 and 15. In other words,
Three ring-shaped iron cores 20 and two ring-shaped coils 2
As shown in FIG. 15, the ring-shaped core 20 has a plurality of teeth 22 along the circumferential direction on its inner peripheral wall.
is provided. On the other hand, the ring-shaped coil 21 interposed between the ring-shaped iron cores 20 connects the two ring-shaped coils 21 to the wire connection.

The three ring-shaped iron cores 20 have teeth 22 of the same shape.
As shown in FIG. 15, the cores 20 are arranged so as to be offset from each other by 120 degrees in electrical angle. Further, each of the ring-shaped cores 20 is magnetically coupled to each other by a yoke 23 bridging the outer periphery thereof.

However, even if the above-mentioned novel stator is proposed, the rotor of a reluctance motor still has a structure with the lumpy magnetic unevenness found in small-capacity step motors, and has a large eddy current product. , even if the permanent magnet shown in FIG. 6 is employed, it is impossible to increase the capacity.

Therefore, in view of the above-mentioned problems, the present invention aims to provide a new rotor that is suitable for the newly proposed stator in a reluctance motor that has a large capacity and generates a large torque despite its small size. do.

The aim is to obtain a rotor in which magnetic poles formed by laminating magnetic plates in the circumferential direction are arranged equidistantly along the circumferential direction.

E Effect The magnetic flux passing in the axial direction can be appropriately collected and passed by the magnetic pole made of the laminated magnetic plate while reducing eddy current and the like.

D. Means for Solving the Problems The present invention, which achieves the above objects, comprises three ring-shaped iron cores each having a plurality of teeth equally spaced along the circumferential direction on the inner circumferential surface.
They are arranged in the axial direction so that they are electrically shifted by 120 degrees so that they form coaxial centers, and two ring-shaped coils are interposed between the above three arranged iron cores so that they are coaxial with this iron core. For a stator with a configuration in which two ring-shaped coils are connected to a three-phase power supply by connecting two ring-shaped coils to a three-phase power supply, a large number of axially extending grooves are provided on the outer peripheral surface of a non-magnetic material. The present invention will be described in detail with reference to FIG. In FIG. 1, 20 is the iron core of the stator, and 22 is the tooth. The rotor 30 surrounded by the iron core 20 has a configuration in which a plurality of magnetic poles 31 are provided around a non-magnetic base material 32 in order to generate reluctance torque.

Among these, the base material 32 of the rotor 30 is a cylindrical rotating body made of a non-magnetic material such as aluminum,
On its outer periphery, there is a groove 3 in which the magnetic 8F131 is accommodated along the circumferential direction.
3 are equally spaced as shown in FIG. Therefore, s33 has a structure extending in the axial direction.

On the other hand, magnetic poles 31 are provided in grooves 33 formed in the rotor 30. The magnetic pole 31 has a structure in which ferromagnetic plates are laminated along the circumferential direction of the rotor.

In manufacturing the rotor 30, teeth are cut on the outer periphery of the base material 32 by the number of poles to form FIII 33.

The stacked magnetic poles 31 are accommodated and fixed in the grooves 33. In this case, the magnetic pole 31 is housed in a non-magnetic base material 32 and is magnetically opened.

After that, the magnetic pole 31 is fixed by aluminum die casting. Here, since the side surfaces of the teeth and the magnetic pole 31 are provided with grooves and holes for sprues, the magnetic pole 31 is firmly fixed to the base material 32 by casting aluminum.

The reason why the magnetic poles 31 are laminated in the circumferential direction is that the magnetic flux passing through the rotor passes in the axial direction and alternates in proportion to the power frequency.

Further, the l material 32 of the rotor 30 may be made of stainless steel casting or a stack of punched stainless steel plates.

G. As described in detail, according to the present invention, it is possible to obtain a novel rotor that matches the proposed stator, and it is possible to obtain a reluctance morph that is highly advantageous. Also, this rotor can be manufactured with simple effort.

[Brief explanation of the drawing]

Mr. 1 and 2 show an embodiment of the present invention; FIG. 1 is a partial configuration diagram; FIG. 2 is an exploded configuration diagram; FIG. 3 is a developed view of a conventional stator; IV-IV sectional view in Figure 3, No. 5
The figure is a sectional view taken along the line ■-■ of Figure 3, Figures 6 to 15 are for explaining the stator, Figure 6 is a simplified configuration diagram of a two-pole machine, and Figure 7 is a cross-sectional view of Figure 6. ■-■ Cross-sectional view, Figure 8 is a diagram of the connection state of a ring-shaped coil, Figure 9 is an explanatory diagram of intersecting magnetic flux, @
Figure 10 is a three-phase vector diagram, Figure 11 is a three-phase current waveform diagram,
Figure 12 1a) +bJ) is a diagram of the m-pole pattern,
Fig. 12 1a) is a progression state diagram of the sine wave distribution, Fig. 13 is an explanatory diagram of the excitation current, Fig. 14 is a perspective view of the stator, and Fig. 15
The figure is a NIj1 diagram of the stator. In the figure, O is the iron core, 2 is the tooth, O is the rotor, 1 is the magnetic pole, 2 is the base material, and 3 is the groove. Figure 1: Example structure Figure 2: M perspective patent agent

Claims (1)

[Scope of Claims] A stator having a cylindrical shape and fixedly installed, and a rotor positioned concentrically on the inner circumferential side of the stator and rotatably supported, the stator electrically connects three ring-shaped iron cores with a plurality of teeth equally spaced along the circumferential direction on the inner circumferential surface.
The two ring-shaped coils are arranged in the axial direction so that the cores are coaxial with each other, and the two ring-shaped coils are interposed between the three cores arranged in a row so that the cores are coaxial with the core. The rotor has a structure in which a shaped coil is connected to a V-connection and connected to a three-phase power supply, and the rotor is formed by laminating a large number of magnetic plates extending in the axial direction on the outer peripheral surface of a non-magnetic material in the circumferential direction. A multi-polar reluctance motor characterized by having a configuration in which magnetic poles are arranged equidistantly along the circumferential direction.