KR100917366B1 - Magnet embedded type bldc motor and rotor - Google Patents

Abstract

The present invention relates to a BLDC motor, and more particularly, to fix the magnet in a simple structure so that the magnet embedded in the yoke's recessed groove does not flow, thereby preventing the magnet from being damaged, deteriorating magnetic flux efficiency, and generating a defective motor. The present invention relates to a magnet embedded BCD motor and a rotor capable of preventing, minimizing leakage flux and maximizing effective air gap flux.

The rotor for a magnet embedded type BCD motor according to the present invention includes a rotating shaft, a plurality of magnets having a plate shape, and a rotating shaft hole through which the rotating shaft penetrates, and the plurality of magnets are embedded outside the rotating shaft hole. A cylindrical yoke having a plurality of recessed grooves formed therein, a rotation shaft hole through which the rotating shaft penetrates is formed in the center thereof, a pair of cover plates coupled symmetrically to upper and lower ends of the yoke, and the plurality of embedded recesses Comprising a plurality of projections each protruding on the opposite surfaces of the pair of cover plates to secure both ends of each of the plurality of magnets.

Magnet recessed BCD motor, rotor, stator, yoke, cover plate

Description

Magnet embedded BCD motor and rotor {MAGNET EMBEDDED TYPE BLDC MOTOR AND ROTOR}

The present invention relates to a BLDC motor, and more particularly, to fix the magnet in a simple structure so that the magnet embedded in the yoke's recessed groove does not flow, thereby preventing the magnet from being damaged, deteriorating magnetic flux efficiency, and generating a defective motor. The present invention relates to a magnet embedded BCD motor and a rotor capable of preventing, minimizing leakage flux and maximizing effective air gap flux.

In general, a motor is a device that obtains rotational force by converting electrical energy into mechanical energy, and is widely used not only in home appliances but also in industrial equipment.

The conventional DC motor has been required to reduce the reliability, shorten the lifespan and consequent maintenance that are caused by the switching drive by the mechanical contact between the commutator and the brush. It is being replaced by Biel DC motor.

Brushless DC (BLDC) motors install the armature windings on the rotor and the field and stator on the rotor, and use a hall sensor, usually a photo diode, to direct the winding current. It is a motor that has the same characteristics as a brush-type motor by determining.

The BCD motor uses a switching method using a semiconductor device, eliminating the need for mechanical contact, and thus, the motor has a long life and uses a permanent magnet (magnet) having high energy density, which is advantageous for high efficiency and small size, and shift control. There is an advantage such as ease of use, the demand is increasing day by day.

The BCD motor is classified into an internal rotor type and an external rotor type according to the internal and external structures of the rotor and the stator. An electric motor is a stator in which a driving coil is wound around an integrated rotor as a shaft is attached to or adhered to a cylindrical magnet, and an abduction motor has a magnet provided around a stator in which a coil is wound. The self-rotating structure, that is, the cup-shaped rotor has a structure surrounding the drive coil. In particular, the electric motor is widely used because of its low rotational inertia and easy balance of the rotors.

Such a DC motor is classified into a magnet-attached motor and a magnet embedded motor according to the structure of the magnet provided in the rotor.

1 is a cross-sectional view of a conventional magnet-attached motor, in which the rotor 10 is rotatably installed inside the stator 20. The stator 20 is formed by laminating a plurality of thin silicon steel sheets, and a plurality of teeth 24 are provided at regular intervals along the inner circumferential surface, and are formed by the teeth 24 together with the teeth 24. An insulator 28 is installed to insulate the slot 26 from the coil 22, and the rotor 10 is rotatably installed with a gap therein. Like the stator 20, the rotor 10 is formed in a circumferential shape by stacking a plurality of silicon steel sheets, and a coil wound around the stator 20 is fixed by penetrating the rotating shaft 11 at the center thereof. A magnet 12 generating torque by interaction with a magnetic field generated at 22 is attached along the outer circumferential surface of the yoke 13.

The magnet-mounted motor has no big problem in use in general small electric motors such as home appliances, but in the case of medium and large motors, predetermined rotation is caused due to an increase in the weight of the magnet 12 as the radius of the rotor 10 increases. Departure and breakage of the magnet 12 due to the centrifugal force occurs in a number or more. Accordingly, a magnet embedded motor has been proposed to expand its application.

Figure 2 is a cross-sectional view showing a conventional magnet embedded motor, Figure 3 is an exploded perspective view showing a rotor of a conventional magnet embedded motor, Figure 4 is a state in which the magnet embedded in the yoke in the embodiment of FIG. It is a cross-sectional view.

The conventional magnet embedded motor is not different from the stator 20 of the magnet-attached motor as shown in FIG. 2, but there is a big difference in the structure of the rotor 10. That is, the recessed grooves 14 are formed in the yoke 13 so that a plurality of magnets 12 may be embedded in each, and as shown in FIG. 3, the recessed grooves 14 of the yoke 13 are embedded. There is a pair of cover plates 16 coupled to the upper and lower ends of the yoke 13 so that the plurality of magnets 12 do not escape up and down of the yoke.

Meanwhile, as shown in FIG. 4, when a plurality of magnets 12 are respectively embedded in the embedding grooves 14 of the yoke 13, a plurality of embeddings are formed such that air layers are formed at both ends of the embedding grooves 14. The embedding groove 14 is formed longer than the length of both ends of the magnet 12. This air layer acts as a magnetic flux barrier, and it is an essential element that meets the design goals of BLC motors such as minimizing leakage flux and maximizing effective air gap flux.

In the conventional magnet recessed motor as described above, the magnet 12 is recessed during rotation of the rotor 10 by air layers formed at both ends of the magnet 12 embedded in the recessed groove 14 of the yoke 13. In order to prevent the flow in the (14), as shown in Figure 4, the minute projections 17 may be formed to fix both ends of the magnet 12 in the recess 14 of the yoke (13).

Conventional magnet embedded type BCD motors as described above have a problem that not only fine processing is difficult to form fine protrusions in the recess grooves of the yoke, but also leakage flux increases due to the fine protrusions.

In addition, even when the micro projections are formed in the yoke, friction occurs between the magnets and the micro projections due to the rotation of the rotor, and wear or gaps are generated between the magnets and the micro projections due to processing tolerances, so that fixing of the magnets is not easy. There is.

In addition, the magnet flow occurs in the yoke for the same reason as described above, which leads to the increase of the leakage flux and the reduction of the effective air flux, as well as the vibration and noise of the BCD motor, resulting in a problem of deterioration in reliability and quality.

An object of the present invention devised to solve the above problems is to fix the magnet in a simple structure so that the magnet embedded in the recess groove of the yoke does not flow to prevent the breakage of the magnet, deterioration of magnetic flux efficiency and occurrence of motor failure. It is to provide magnet embedded BCD motor and rotor.

In addition, by suppressing the flow of the magnet, it is possible to minimize the leakage flux and to maximize the effective void flux, and to prevent the vibration and noise of the BCD motor to improve the reliability and quality of the magnet embedded BCD motor and To provide the rotor.

Other objects, specific advantages and novel features of the invention will become more apparent from the following detailed description and preferred embodiments in conjunction with the accompanying drawings.

In order to achieve the above object, the rotor for a magnet embedded BCD motor according to the present invention includes a rotating shaft, a plurality of magnets in a plate shape, and a rotating shaft hole through which the rotating shaft penetrates in the center thereof. A cylindrical yoke through which a plurality of embedding grooves into which the plurality of magnets are embedded is formed, a rotation shaft hole through which the rotating shaft penetrates is formed, and a pair of cover plates that are symmetrically coupled to upper and lower ends of the yoke; Comprising a plurality of projections each protruding on the surface facing each other of the pair of cover plates to fix both ends of each of the plurality of magnets embedded in the recess groove of the.

The plurality of protrusions may be press-worked integrally with the pair of cover plates.

The plurality of protrusions may be formed by punching the pair of cover plates, respectively.

The plurality of protrusions may be cut and bent from the pair of cover plates, respectively.

The plurality of projections may be integrally cast with the pair of cover plates.

The plurality of protrusions may be welded to the pair of cover plates, respectively.

In addition, the recessed grooves of the yoke are disposed at radial equal intervals, and the pair of cover plates are formed by penetrating a plurality of slots arranged in an annular shape corresponding to the plurality of recessed grooves, and the plurality of protrusions are provided in the pair. And a plurality of bolts movably coupled to each other along the plurality of slots respectively formed on the cover plate, and a plurality of nuts for fixing the plurality of bolts, respectively.

On the other hand, the magnet embedded Biel DC motor according to the present invention, the magnet embedded Biel including a stator for receiving a current to generate a magnetic force, and a rotor rotatably installed inside the stator to rotate by the magnetic force In the DC motor, the rotor has a rotating shaft, a plurality of magnets in a plate shape, and a rotating shaft hole through which the rotating shaft penetrates, and a plurality of embedded grooves in which the plurality of magnets are embedded outside the rotating shaft hole. A cylindrical yoke formed therethrough, a rotating shaft hole through which the rotating shaft penetrates are formed in the center thereof, a pair of cover plates that are symmetrically coupled to upper and lower ends of the yoke, and each of the plurality of magnets embedded in the plurality of embedding grooves. Protruding from each other to face each other of the pair of cover plates to fix both ends Comprise the number of projections.

In addition, the recessed grooves of the yoke are disposed at radial equal intervals, and the pair of cover plates are formed through a plurality of slots arranged in an annular shape corresponding to the plurality of recessed grooves, and the plurality of protrusions have And a plurality of bolts movably coupled to the plurality of slots respectively formed in the pair of cover plates, and a plurality of nuts for fixing the plurality of bolts, respectively.

The rotor for magnet embedded BCD motors according to the present invention simply forms a plurality of protrusions to fix both ends of each of the plurality of magnets on opposite surfaces of the pair of cover plates coupled to the upper and lower ends of the yoke, thereby simplifying the magnet. Can be fixed

In addition, in processing a plurality of protrusions, mass production is easy by a method such as pressing, punching, casting, etc., and the work man-hour can be significantly reduced.

In addition, a plurality of slots are formed through the pair of cover plates, and the plurality of protrusions are formed by bolts and nuts so as to be movable along the plurality of slots, so that the magnets can be easily fixed to the size or number of magnets. Can be.

On the other hand, the magnet embedded BCD motor according to the present invention can be easily fixed to the magnet according to the structure of the rotor as described above to prevent the breakage of the magnet, deterioration of magnetic flux efficiency and the occurrence of defective motor, It is possible to minimize and maximize the effective air gap flux, thereby suppressing the generation of noise and vibration can provide a high quality, high reliability motor.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the magnet embedded BCD motor and rotor according to the present invention.

Figure 5 is an exploded perspective view showing an embodiment of a magnet embedded BCD motor according to the present invention, Figure 6 is a perspective view showing a main portion of the magnet is fixed by a protrusion formed on the cover plate in the embodiment of FIG. 7 is a perspective view showing a second embodiment of a cover plate of a magnet embedded BCD motor according to the present invention, and FIG. 8 is a third embodiment of a cover plate of a magnet embedded BCD motor according to the present invention. 9 is a perspective view showing a fourth embodiment of the cover plate of the magnet embedded BCD motor according to the present invention, Figure 10 is an exploded view of one of the bolts and nuts of the embodiment of FIG. It is an exploded perspective view which shows the state.

The magnet embedded BCD motor according to the present invention includes a rotor 100 and a stator 200 as shown in FIG. 5, and the rotor 100 includes a rotating shaft 110 and a magnet 120. ), The yoke 130, the cover plate 140 and the protrusion 150 is made. In addition, the yoke 130 has a rotation shaft hole 132 and the recess groove 134 is formed, the cover plate 140 may be formed through the rotation shaft hole 132 is formed through a slot 145. . In addition, the protrusion 150 may be composed of a bolt 152 and a nut 154.

The magnet embedded BCD motor of the present invention includes a stator 200 that receives a current and generates a magnetic force, and a rotor 100 rotatably installed in the stator 200 to rotate by the magnetic force. It is done by

5 and 2, the stator 200 is formed by laminating a plurality of coiled thin silicon steel sheets, and a plurality of teeth 24 are provided at regular intervals along an inner circumferential surface thereof. Insulators 28 are provided to insulate the slots 26 formed by the teeth 24 together with the teeth 24 from the coils 22.

The rotor 100 is installed inside the stator 200 and rotates by the magnetic force generated in the stator 200. In addition, the rotor 100 is similar to the stator 200, by stacking a plurality of silicon steel sheets, the yoke 130 formed in a circumferential shape, and the rotation shaft 110 penetrated and fixed at the center thereof, and are wound on the stator 200. The magnet 120 generating torque by the interaction with the magnetic field generated in the coil is embedded in the recess groove 134 of the yoke 130 is fixed.

5 and 6, a plurality of magnets 120 are arranged in a rectangular plate shape, and each of the magnets 120 is embedded in the recess groove 134 of the yoke 130 to be described later.

The yoke 130 has a rotation shaft hole 132 through which the rotation shaft 110 penetrates in the center thereof, and a plurality of recess grooves 134 in which the plurality of magnets 120 are embedded outside the rotation shaft hole 132. It is formed through. In addition, the recess 134 of the yoke 130 is disposed at radial equal intervals so that the plurality of magnets 120 are embedded.

The cover plate 140 is to prevent the plurality of magnets 120 embedded in the recess 134 of the yoke 130 from being separated in the axial direction and to prevent foreign substances from leaking due to corrosion of the magnets 120. . That is, the cover plate 140 is provided with a pair of rotating shaft holes 132 through which the rotating shaft 110 penetrates in the center thereof, respectively, and are coupled to be symmetrical to the upper and lower ends of the yoke 130.

The rotating shaft 110, the magnet 120, the yoke 130, and the cover plate 140 constituting the rotor 100 may be implemented by a conventional technology, and thus, a detailed description thereof is omitted, and the yoke is a feature of the present invention. Components for preventing the flow of the magnet 120 embedded in the 130, that is, the protrusion 150 will be described in detail.

As shown in FIGS. 5 and 6, the protrusion 150 includes a plurality of cover plates to fix both ends of each of the plurality of magnets 120 embedded in the plurality of recesses 134. The protrusions 140 are formed to face each other. That is, the cover plate 140 is not only coupled to prevent the axial flow of the magnet 120, by forming a protrusion 150 on the cover plate 140 to fix both ends of the magnet 120, It is also possible to prevent the flow in the left and right direction of the magnet 120 embedded in the recess 134 of the yoke 130.

In order to process the plurality of protrusions 150 to the cover plate 140, it can be simply formed by pressing or punching as shown in Figures 5 and 6, as shown in Figure 7 Each of the plurality of protrusions 150 may be welded to the 140, or may be integrally cast together with the cover plate 140. In addition, as illustrated in FIG. 8, the plurality of protrusions 150 may be formed by cutting and bending the cover plates 140, respectively. That is, the plurality of protrusions 150 may be previously formed on the cover plate 140 by pressing or casting to match the size of the magnet 120, and according to the size of each magnet 120 manufactured or magnetized. It is possible to form a plurality of protrusions 150 by cutting or bending a punching process or welding or the cover plate 140.

On the other hand, the plurality of protrusions 150 may be formed to be variable to match the size of each of the plurality of magnets (120). That is, for this purpose, as shown in FIGS. 9 and 10, the plurality of slots 145 are formed in an annular shape so as to correspond to the plurality of recesses 134 in the pair of cover plates 140, and The protrusion 150 is movably coupled along the slot 145. To this end, the plurality of protrusions 150 may include a plurality of bolts 152 movably coupled to the plurality of slots 145 respectively formed on the pair of cover plates 140, and the plurality of bolts ( It may include a plurality of nuts (154) for fixing each 152. Accordingly, the bolt 152 is moved along the slot 145 in accordance with the size of the magnet 120 to be fixed to both ends of the magnet 120, and then firmly secured with a nut 154 to fix the bolt 152. To combine. In this case, a packing such as rubber may be coupled between the bolt 152 and the nut 154 or between the cover plate 140 to be more firmly coupled.

The embodiments of the present invention described above and illustrated in the drawings should not be construed as limiting the technical idea of the present invention. The protection scope of the present invention is limited only by the matters described in the claims, and those skilled in the art can change and change the technical idea of the present invention in various forms. Therefore, such improvements and modifications will fall within the protection scope of the present invention, as will be apparent to those skilled in the art.

1 is a cross-sectional view showing a conventional magnet-attached motor,

2 is a cross-sectional view showing a conventional magnet embedded motor,

3 is an exploded perspective view showing a conventional magnet embedded motor,

4 is a cross-sectional view showing a state in which a magnet is embedded in the yoke in the embodiment of FIG.

5 is an exploded perspective view showing an embodiment of a magnet embedded BCD motor according to the present invention,

FIG. 6 is a perspective view illustrating main parts of the magnet in a fixed state by protrusions formed on the cover plate in the embodiment of FIG. 5;

7 is a perspective view showing a second embodiment of the cover plate of the magnet embedded BCD motor according to the present invention;

8 is a perspective view showing a third embodiment of the cover plate of the magnet embedded BCD motor according to the present invention;

9 is a perspective view showing a fourth embodiment of the cover plate of the magnet embedded BCD motor according to the present invention;

FIG. 10 is an exploded perspective view illustrating an exploded state of one of the bolts and nuts of the embodiment of FIG. 9.

<Explanation of symbols for the main parts of the drawings>

100: rotor

110: rotation axis

120: magnet

130: York

132: rotation axis ball 134: buried groove

140: cover plate 145: slot

150: projection

152: bolt 154: nut

200: stator

Claims (9)

delete Rotation axis, A plurality of magnets in the plate shape, A cylindrical yoke having a rotating shaft hole through which the rotating shaft penetrates, and having a plurality of embedding grooves through which the plurality of magnets are embedded outside the rotating shaft hole; A pair of cover plates having a rotating shaft hole through which the rotating shaft penetrates and are symmetrically coupled to upper and lower ends of the yoke; Comprising a plurality of projections each protruded on the surface facing each other of the pair of cover plates to secure both ends of each of the plurality of magnets embedded in the plurality of embedding groove, The plurality of protrusions, Rotor for magnet embedded BCD motor which is press-worked integrally with the pair of cover plates. Rotation axis, A plurality of magnets in the plate shape, A cylindrical yoke having a rotating shaft hole through which the rotating shaft penetrates, and having a plurality of embedding grooves through which the plurality of magnets are embedded outside the rotating shaft hole; A pair of cover plates having a rotating shaft hole through which the rotating shaft penetrates and are symmetrically coupled to upper and lower ends of the yoke; Comprising a plurality of projections each protruded on the surface facing each other of the pair of cover plates to secure both ends of each of the plurality of magnets embedded in the plurality of embedding groove, The plurality of protrusions, A rotor for magnet embedded BCD motors formed by punching the pair of cover plates, respectively. Rotation axis, A plurality of magnets in the plate shape, A cylindrical yoke having a rotating shaft hole through which the rotating shaft penetrates, and having a plurality of embedding grooves through which the plurality of magnets are embedded outside the rotating shaft hole; A pair of cover plates having a rotating shaft hole through which the rotating shaft penetrates and are symmetrically coupled to upper and lower ends of the yoke; Comprising a plurality of projections each protruded on the surface facing each other of the pair of cover plates to secure both ends of each of the plurality of magnets embedded in the plurality of embedding groove, The plurality of protrusions, A rotor for magnet embedded BCD motors, each cut out of the pair of cover plates and bent. Rotation axis, A plurality of magnets in the plate shape, A cylindrical yoke having a rotating shaft hole through which the rotating shaft penetrates, and having a plurality of embedding grooves through which the plurality of magnets are embedded outside the rotating shaft hole; A pair of cover plates having a rotating shaft hole through which the rotating shaft penetrates and are symmetrically coupled to upper and lower ends of the yoke; Comprising a plurality of projections each protruded on the surface facing each other of the pair of cover plates to secure both ends of each of the plurality of magnets embedded in the plurality of embedding groove, The plurality of protrusions, Rotor for magnet embedded BCD motor molded integrally with the pair of cover plate. Rotation axis, A plurality of magnets in the plate shape, A cylindrical yoke having a rotating shaft hole through which the rotating shaft penetrates, and having a plurality of embedding grooves through which the plurality of magnets are embedded outside the rotating shaft hole; A pair of cover plates having a rotating shaft hole through which the rotating shaft penetrates and are symmetrically coupled to upper and lower ends of the yoke; Comprising a plurality of projections each protruded on the surface facing each other of the pair of cover plates to secure both ends of each of the plurality of magnets embedded in the plurality of embedding groove, The plurality of protrusions, A rotor for magnet embedded BCD motors, each welded to the pair of cover plates. Rotation axis, A plurality of magnets in the plate shape, A cylindrical yoke having a rotating shaft hole through which the rotating shaft penetrates, and having a plurality of embedding grooves through which the plurality of magnets are embedded outside the rotating shaft hole; A pair of cover plates having a rotating shaft hole through which the rotating shaft penetrates and are symmetrically coupled to upper and lower ends of the yoke; Comprising a plurality of projections each protruded on the surface facing each other of the pair of cover plates to secure both ends of each of the plurality of magnets embedded in the plurality of embedding groove, The grooves of the yoke are arranged at radial equal intervals, The pair of cover plates are formed through the plurality of slots disposed in an annular shape corresponding to the plurality of recessed grooves, The plurality of protrusions include a plurality of bolts movably coupled to a plurality of slots respectively formed in the pair of cover plates, and a plurality of magnets for fixing the plurality of bolts, respectively. Rotor for the motor. delete In the magnet embedded BCD motor comprising a stator for receiving a current to generate a magnetic force, and a rotor rotatably installed inside the stator to rotate by the magnetic force, The rotor, Rotation axis, A plurality of magnets in the plate shape, A cylindrical yoke having a rotating shaft hole through which the rotating shaft penetrates, and having a plurality of embedding grooves through which the plurality of magnets are embedded outside the rotating shaft hole; A pair of cover plates having a rotating shaft hole through which the rotating shaft penetrates and are symmetrically coupled to upper and lower ends of the yoke; Comprising a plurality of projections each protruded on the surface facing each other of the pair of cover plates to secure both ends of each of the plurality of magnets embedded in the plurality of embedding groove, The grooves of the yoke are arranged at radial equal intervals, The pair of cover plates are formed through the plurality of slots disposed in an annular shape corresponding to the plurality of recessed grooves, The plurality of protrusions include a plurality of bolts movably coupled to a plurality of slots respectively formed in the pair of cover plates, and a plurality of magnets for fixing the plurality of bolts, respectively. motor.

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