KR20160137207A

KR20160137207A - Switched reluctance motor using the same

Info

Publication number: KR20160137207A
Application number: KR1020150072008A
Authority: KR
Inventors: 오영한; 신말순
Original assignee: 오영한; 신말순
Priority date: 2015-05-22
Filing date: 2015-05-22
Publication date: 2016-11-30
Also published as: KR101683779B1

Abstract

Disclosed is a switched reluctance motor improved in noise caused by the salient poles of the rotor and the stator, and a problem of power reduction due to the noise.
According to an aspect of the present invention, a switched reluctance motor includes a stator and a rotor. The stator has a hollow cylindrical shape and a plurality of salient poles on which coils are wound are formed on the inner peripheral surface. The rotor is composed of a central shaft and a cylindrical core portion coupled to the central shaft and having a plurality of salient poles on its outer surface, and is rotatably installed inside the stator. Each of the salient poles of the stator is provided with a first through hole formed in an axial direction.

Description

[0001] Switched reluctance motor using the same [

The present invention relates to an electric motor, and more particularly, to a switched reluctance motor.

In recent years, the demand for electric motors has greatly increased in various fields such as automobiles, aerospace, military, and medical equipment. Particularly, as the price of rare earth materials increases, the unit price of a motor using a permanent magnet increases, and a Switched Reluctance Motor is attracting attention as an alternative to a permanent magnet motor.

The Switched Reluctance Motor (SRM), which has a long history in the field of electric energy conversion and mechanical energy conversion of electric energy, has a pole in each of the stator and rotor, The coil is wound on the rotor, while the rotor has no coils or magnets.

FIG. 1 shows an example of the switched reluctance motor 100. The switched reluctance motor 100 includes a rotor 110 and a stator 120. A plurality of rotor salient poles 111 are formed on the rotor 110 and a plurality of rotor salient poles 111 are formed on the stator 120, A plurality of stator salient poles 121 opposed to the electron salient poles 111 are formed. A coil 130 is wound around the stator pole 121. The rotor 110 is composed of only an iron core without any excitation device such as a coil winding or a permanent magnet.

The driving principle of the switched reluctance motor is to rotate the rotor by using a reluctance torque generated according to the change of the magnetoresistance. Specifically, when the pole of the stator is excited, the torque is obtained by using the torque of the force to move in a state in which the pole of the rotor, which is not wound, does not coincide with the pole of the stator. That is, the magnetic circuit uses the force of the magnetic circuit to move to the lowest degree of coincidence in the highest reluctance state where the projecting poles are not mutually coincident.

Therefore, in the switched reluctance motor, the protruding poles of the stator and the rotor are configured so that the reluctance torque action occurs mutually continuously. In the case of a two-phase motor in which the inner ring rotates in general, it is composed of a quadrupole stator and a bipolar rotor Phase motor is composed of a 6 pole stator and a 4 pole rotor. In the case of a 4-phase motor, it is composed of an 8 pole stator and a 6 pole rotor. In the case of a 5-phase motor, a 10 pole stator and an 8 pole rotor .

Such a switched reluctance motor is simpler in structure than conventional induction motors and synchronous motors, and can be produced at low cost. In addition, since no winding or permanent magnet is used in the rotor, it is excellent in durability and is not influenced by the limited magnetic energy of the permanent magnet. Therefore, the torque and efficiency per unit volume are excellent and the speed-output control characteristic is excellent. And it offers many advantages such as high durability in high temperature environment.

However, due to the pore structure of the rotor and the stator, there is a disadvantage in that noise is generated due to the vortex phenomenon generated during high-speed rotation and the output is lowered due to this phenomenon.

Korean Patent Publication No. 10-2013-0025141 (March 31, 2013)

An object of the present invention is to provide a switched reluctance motor in which noise caused by a salient pole of a rotor and a stator and a problem of power reduction due to the noise are improved.

According to an aspect of the present invention, there is provided a switched reluctance motor including a stator and a rotor. The stator has a hollow cylindrical shape and a plurality of salient poles on which coils are wound are formed on the inner peripheral surface. The rotor is composed of a central shaft and a cylindrical core portion coupled to the central shaft and having a plurality of salient poles on its outer surface, and is rotatably installed inside the stator. Each of the salient poles of the stator is provided with a first through hole formed in an axial direction.

According to another aspect of the present invention, the stator may be provided with a plurality of horizontally formed second through holes.

According to another aspect of the present invention, each of the salient poles of the core portion may be provided with a third through hole formed in an axial direction.

According to another aspect of the present invention, each of the salient poles of the core portion may have a fourth through hole formed horizontally.

According to another aspect of the present invention, the rotor may further include a pair of cover portions coupled to the core portion and the core portion, the pair of cover portions being spaced apart from the core portion.

According to the present invention, problems caused by the noise caused by the salient poles of the rotor and the stator and the resulting power degradation are improved.

In addition, a pair of cover portions coupled to the upper and lower portions of the core portion so as to be spaced apart from the core portion smoothes the flow of air, thereby reducing heat generation accompanying the rotation of the rotor.

1 shows a conventional switched reluctance motor.
2 is a perspective view of a switched reluctance motor rotor in accordance with an embodiment of the present invention.
3 is a perspective view of a stator of a switched reluctance motor according to an embodiment of the present invention.
4 is a perspective view of a switched reluctance motor according to an embodiment of the present invention.
5 is a plan view of the switched reluctance motor shown in FIG.
FIG. 6 is a view showing that the insulating member is coupled to the salient pole of the stator shown in FIG.

The foregoing and further aspects will become apparent through the following examples. In the present specification, corresponding elements in each figure are referred to by the same numerals. In addition, the shape and size of the components can be exaggerated. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

FIG. 2 is a perspective view of a switched reluctance motor rotor according to an embodiment of the present invention, FIG. 3 is a perspective view of a switched reluctance motor stator according to an embodiment of the present invention, FIG. FIG. 5 is a plan view of the switched reluctance motor shown in FIG. 4. FIG.

Referring to FIGS. 2 to 5, the switched reluctance motor 100 includes a stator 120 and a rotor 110.

The stator 120 has a hollow cylindrical shape and a plurality of salient poles 121 wound with the coil 122 are formed on the inner peripheral surface. The rotor 110 is accommodated in the stator 120 and rotated. The stator 120 may be formed by laminating a plurality of thin steel plates in the axial direction. Although the illustrated stator 120 has a circular outer shape, the outer shape of the stator 120 may be rectangular or pentagonal.

The salient poles 121 of the stator 120 may be arranged at regular intervals. The number of the pores 121 may be varied depending on the power source to be used. For example, six salient poles 121 can be formed for a three-phase motor and eight salient poles 121 for a four-phase motor. On the other hand, in order to block the magnetic flux movement between the salient poles 121, an insulating member 130 that covers and isolates each salient pole 121 is coupled to each salient pole 121 of the stator 120 before the coil is wound Reference).

The rotor 110 includes a central axis 111 and a cylindrical core portion 113 coupled to the central axis 111 and having a plurality of salient poles 114 on the outer peripheral surface thereof. The rotor 110 is rotatably installed inside the stator 120. The center shaft 111 transmits the driving force of the motor to the outside. Accordingly, a keyway for coupling other objects may be provided at one end of the center shaft 111. [ The salient pole 114 formed on the outer peripheral surface of the core portion 113 may be formed at regular intervals. The number of the salient poles 114 formed on the outer circumferential surface of the core portion 113 can be matched with the number of salient poles of the stator 120. For example, the number of the stator poles 121 may be twelve, and the number of the core poles 113 may be ten.

Each of the salient poles 121 of the stator 120 is provided with a first through hole 121a formed in an axial direction. The first through hole 121a may be a square or a circle. Also, a plurality of first through-holes 121a may be formed in one of the pores 121. The shapes of the first through holes 121a may be different from each other.

When power is externally applied to the coil 122 of the switched reluctance motor 100 formed as described above, a reluctance torque is generated, and the rotor 110 is rotated in a direction in which the resistance of the magnetic circuit is minimized . At this time, due to the first through-hole 121a provided in each of the salient poles 121 of the stator 120, noise caused by a vortex phenomenon generated when the rotor 110 rotates at a high speed and the resulting output drop is minimized.

In addition, the stator 120 may include a plurality of second through holes 120a formed horizontally. The second through-hole 120a may be formed at a portion where the pore 121 is not formed. When a plurality of second through holes 120a are additionally provided in the stator 120, generation of noise due to a vortex phenomenon occurring when the rotor 110 rotates at a high speed and the resulting output drop are minimized.

Each of the salient poles 114 of the core portion 113 may have a third through hole 114a formed in the axial direction. The cross section of the third through hole 114a may be a square or a circle. Each of the salient poles 114 of the core portion 113 may have a fourth through-hole 114b formed horizontally. When the third through holes 114a and the fourth through holes 114b are provided in the respective salient poles 114 of the core portion 113 as described above, do.

The rotor 110 may further include a pair of cover portions 112 coupled to upper and lower portions of the core portion 113 to be spaced apart from the core portion 113. The cover portion 112 may be in the form of a plate having the same cross section as the core portion 113. That is, a plurality of protrusions may be formed on the outer circumferential surface. In the case where the cover portion 112 is further included, the cover portion 112 smoothly flows the air, thereby reducing heat generation accompanying the rotation of the rotor 110.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art. There will be. Accordingly, the true scope of protection of the present invention should be determined only by the appended claims.

100: Switched reluctance motor 110: Rotor
120: stator 112: cover part
113: core portion 114:
114a: Third through hole 114b: Fourth through hole
120a: second through hole 121: stator pole piece
121a: first through hole 122: coil
123: Insulation member

Claims

A stator formed in a hollow cylindrical shape and having a plurality of salient poles wound with coils on its inner peripheral surface; And
A rotor comprising a central shaft, a cylindrical core portion coupled to the central shaft and having a plurality of salient poles on an outer circumferential surface thereof, and rotatably installed inside the stator;
/ RTI >
Wherein each of the salient poles of the stator has a first through hole formed in an axial direction thereof.

The method according to claim 1,
Wherein the stator has a plurality of second through holes horizontally formed therein.

The method according to claim 1,
And a third through hole is formed in each of the salient poles of the core portion so as to be axially penetrated.

The method of claim 3,
And a fourth through hole formed horizontally in each of the salient poles of the core portion.

The method according to claim 1,
Wherein the rotor further comprises a pair of cover portions coupled to upper and lower portions of the core portion so as to be spaced apart from the core portion.