KR20210055368A - Consequent pole motor - Google Patents

Abstract

The present invention relates to a consequent pole type motor which comprises: a stator including a plurality of teeth arranged along a circumference direction to generate a rotational magnetic field by a wound wire provided on the plurality of teeth; a plurality of magnet units provided inside or outside the stator to generate a rotational force in cooperation with the rotational magnetic field; and a rotor in which a plurality of space units are alternately formed along a circumferential direction with respect to the center of rotation. According to the present invention, the consequent pole type motor has the magnet units, made of bent magnet members, and the space units, wherein the magnet units and the space units are alternately arranged, thereby reducing a use amount of a permanent magnet and providing a relatively high magnetic flux density.

Description

Consequent pole motor

The present invention relates to a consequent pole motor, and to a consequent pole motor having advantages in a high speed region while reducing the amount of use of permanent magnets.

The interior permanent magnet (IPM) has the advantage of obtaining a reluctance torque component in addition to the magnet torque component compared to a surface-mounted motor.

Accordingly, the permanent magnet embedded motor can increase the power density compared to the surface-attached permanent magnet motor, is advantageous in high speed structurally, and structurally prevents the scattering problem of the permanent magnet, so it is being used in various fields.

In particular, in energy systems that require high power density and efficiency, motors employing magnets in a rare earth series with a high residual magnetic flux density are being produced.

However, there are drawbacks in that the price of rare earth magnets has recently increased, and the supply is unstable due to limited production countries and export restrictions.

Unexamined Patent Publication No. 10-2015-0007259: High torque rotary motor

The present invention was invented to improve the above problems, and an object of the present invention is to provide a consequent pole type motor having an advantage in a high speed region by providing a relatively high magnetic flux density while reducing the amount of use of permanent magnets.

The consecant pole motor according to the present invention for achieving the above object includes a plurality of teeth arranged along a circumferential direction, a stator generating a rotating magnetic field by windings provided on the plurality of teeth, and an inner or outer side of the stator A plurality of magnet units that are provided in the rotating magnetic field to generate a rotational force, and a plurality of space portions are provided with a rotor alternately formed along the circumferential direction with respect to the rotation center.

The magnet unit extends from the rotation center of the rotor in the edge direction, and has a plurality of first magnetic members installed on the rotor such that one end is adjacent to the center of the rotor, and one end on the other end of the first magnetic member. And a plurality of second magnetic members which are adjacent to each other and extend from the first magnetic member in a direction of an edge of the rotor.

The first magnetic members are formed such that one end is adjacent to each other and is spaced apart from each other toward the other end, and the opposite sides are formed to be curved to be concave, and the second magnetic members have one end of the other end of the first magnetic members. Doedoe, respectively, are formed to be spaced apart from each other toward the other end, and are formed to be curved so that the opposite sides are convex.

It is preferable that the space portion is formed to extend from the center of rotation of the rotor in the edge direction.

The space portion may be formed such that the width decreases from one end adjacent to the rotation center of the rotor to the other end adjacent to the edge of the rotor.

The space portion may be formed to be curved so that inner surfaces facing each other are convex.

On the other hand, the consecant pole motor according to the present invention is installed in the space, is formed in a shape corresponding to the space so that the outer surface is in close contact with the inner surface of the space, and may further include a spacer made of a non-magnetic material. have.

The spacer is formed so as to decrease in width from the center of rotation of the rotor toward the edge of the rotor, and a first binding groove is formed on an outer surface thereof to a predetermined depth inward, and the first binding groove is the spacer The rotor is formed to be inclined so as to be adjacent to the rotation center of the rotor as it is inserted from the outer surface of the rotor to the inside, and the rotor has a second coupling groove formed on the inner surface of the space portion opposite to the first coupling groove, and the rotor The spacer is inserted into the first and second coupling grooves so as to firmly support the spacer, and the portion inserted into the first coupling groove is closer to the rotation center of the rotor from the outer surface of the spacer to the inner side. It further includes a support member formed to be inclined.

The consequent pole type motor according to the present invention has the advantage of providing relatively high magnetic flux density while reducing the amount of use of permanent magnets since the magnetic units and space portions made of curved magnetic members are arranged alternately.

1 is a conceptual diagram for explaining a consecant pole type motor according to the present invention,
2 is a view of the magnet unit of the consecant pole motor of FIG. 1,
3 is a view for explaining the magnetization direction of the magnet member of the consecant pole motor of FIG. 1,
4 is a conceptual diagram illustrating a consecant pole type motor according to another embodiment of the present invention,
5 is a result of a no-load performance test of the consecant pole type motor according to the present invention,
6 is a cross-sectional view of a consecant pole motor according to the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail for the consecant pole type motor according to an embodiment of the present invention. In the present invention, various modifications may be made and various forms may be applied, and specific embodiments will be illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to a specific form disclosed, it should be understood to include all changes, equivalents, or substitutes included in the spirit and scope of the present invention. In describing each drawing, similar reference numerals have been used for similar elements. In the accompanying drawings, the dimensions of the structures are shown to be enlarged than the actual size for clarity of the present invention.

Terms such as first and second may be used to describe various elements, but the elements should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another component. For example, without departing from the scope of the present invention, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the present application, terms such as "comprise" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, but one or more other features. It is to be understood that the presence or addition of elements or numbers, steps, actions, components, parts, or combinations thereof, does not preclude in advance the possibility of the presence or addition.

Unless otherwise defined, all terms used herein including technical or scientific terms have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms as defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and should not be interpreted as an ideal or excessively formal meaning unless explicitly defined in the present application. Does not.

1 and 2 show a consecant pole type motor 100 according to the present invention.

Referring to the drawings, the consecant pole motor 100 includes a plurality of teeth 112 arranged along a circumferential direction, and generates a rotating magnetic field by a winding 113 provided on the plurality of teeth 112. It includes a stator 110 and a rotor 120 provided inside or outside the stator 110 to generate rotational force in coordination with the rotating magnetic field.

The stator 110 has a cylindrical hollow 111 formed therein so that the rotor 120 can be inserted therein. A plurality of teeth 112 are formed on the inner circumferential surface of the stator 110, and a winding 113 for generating a rotating magnetic field is formed on the teeth 112. For example, the windings 113 may be grouped into a plurality of phases according to a driving mode. 1, the winding 113 of the stator 110 can be divided into a first phase composed of A+, A-, a second phase composed of B+, B-, and a third phase composed of C+, C-. have. The stator 110 is preferably configured to provide a rotating magnetic field to the rotor 120 so that rotation torque can be generated by the interaction of the winding 113 and the magnet member of the rotor 120.

The rotor 120 is rotatably installed in the hollow 111 of the stator 110, and a rotation shaft (not shown) is installed in the center. The rotor 120 is preferably formed to have an outer diameter less than the inner diameter of the hollow 111 of the stator 110 so that a void can be created between the outer surface and the inner surface of the stator 110.

In the rotor 120, a plurality of magnet units 121 and a plurality of spaces 122 are alternately arranged along the circumferential direction based on the rotation center so as to generate rotational force in coordination with the rotating magnetic field of the stator 110. Are prepared.

In the magnet unit 121, referring to FIG. 2, a plurality of bent magnet members are arranged in a trumpet-like shape. The magnet unit 121 is a plurality of first magnetic members installed on the rotor 120 such that one end extends from the center of rotation of the rotor 120 toward the edge, and has one end adjacent to the center of the rotor 120 (123), and a plurality of second magnetic members having one end adjacent to the other end of the first magnetic member 123 and extending from the first magnetic member 123 in the direction of the edge of the rotor 120 ( 124).

The first magnetic members 123 are formed such that one end is adjacent to each other, and is spaced apart from each other toward the other end, and is disposed in a trumpet-shaped lower region (radial direction of the rotor 120 ). In this case, the first magnetic members 123 are arranged to face each other based on the axis of symmetry d in the radial direction. Here, the first magnetic members 123 are formed to be curved so that side surfaces facing each other are concave. That is, it is preferable that the first magnetic members 123 are disposed to be concave toward the inner region of the trumpet-shaped shape.

The second magnetic members 124 are formed such that one end is adjacent to the other end of the first magnetic member 123, and is spaced apart from each other toward the other end, and has a trumpet-shaped upper region (radius of the rotor 120). Direction). At this time, the second magnetic members 124 are arranged to face each other based on the axis of symmetry d in the radial direction. Here, the second magnetic members 124 are formed to be curved so that side surfaces facing each other are convex. That is, it is preferable that the second magnetic members 124 are disposed to be convex toward the inner region of the trumpet-shaped shape. Here, the second magnetic member 124 is formed in a direction opposite to each other in the bending direction of the first magnetic member 123.

Meanwhile, the first and second magnetic members 123 and 124 may be made of a ferrite-based or rare earth-based permanent magnet. In addition, the first and second magnetic members 123 and 124 may have a bending angle of 30 degrees to 120 degrees, and the first and second magnetic members 123 and 124 may have the same or different bending angles. For example, when the bending angles of the first and second magnetic units are different from each other, the bending angle of the second magnetic member 124 in the upper region located in the radial direction of the rotor 120 is the rotor 120 It may be smaller than the bending angle of the first magnetic member 123 in the lower region located in the center direction of. Specifically, the bending angle of the second magnetic members 124 located in the radial direction of the rotor 120 may be smaller than the bending angle of the first magnetic members located in the center direction of the rotor 120.

The first and second magnetic members 123 and 124 may include at least one bending side and a linear side. For example, the first and second magnetic members 123 and 124 include bending sides in the longitudinal direction of the first and second magnetic members 123 and 124, and in the width direction of the first and second magnetic members 123 and 124. It may contain a linear side. In addition, for example, the first and second magnetic members 123 and 124 may include two bending sides facing each other and two linear sides facing each other.

The first and second magnetic members 123 and 124 constituting the magnet unit 121 may be magnetized in a radial or parallel direction. As shown in Fig. 3(a), the first and second magnetic members 123 and 124 may be magnetized in a radial direction, and as shown in Fig. 3(b), the first and second magnetic members 123 and 124 are It can be magnetized in parallel directions.

Meanwhile, although not shown in the drawings, the first magnetic members 123 may have convex sides facing each other, and the second magnetic units may have concave sides facing each other.

As described above, since the first and second magnetic units are formed to have a bent shape, the arrangement of the permanent magnet as a magnetic circuit energy source can be maximized, so that the output density can be improved. From another point of view, even if a ferritic permanent magnet is used instead of a rare-earth-based permanent magnet, which is expensive, performance corresponding to the rare-earth-based permanent magnet can be provided.

In addition, since the magnet unit 121 is made of a plurality of bent permanent magnets, torque ripple can be reduced by lowering the difference in energy density in the air gap.

The space part 122 is formed in the rotor 120 between the magnet units 121 and is filled with air. The space 122 is formed to be drawn in a predetermined depth from the center of rotation of the rotor 120, that is, from the rotation shaft to the edge of the rotor 120 along the radial direction. Since the magnetic flux from the magnet unit 121 flows into the space part 122, the magnetic flux of the magnet unit 121 is prevented from flowing into the rotating shaft.

In this case, the space portion 122 is formed to decrease in width from one end portion adjacent to the rotation center of the rotor 120 to the other end portion adjacent to the edge of the rotor 120. In addition, since the space portion 122 is formed to be curved so that the inner surfaces opposite to each other are convex, the inner shape can be more firmly maintained, so that even if the rotor 120 rotates at high speed, relatively high durability can be maintained.

In the consequent pole motor 100 according to the present invention configured as described above, since the magnet unit 121 and the space part 122 made of a curved magnet member are alternately arranged, the amount of use of permanent magnets is reduced and relatively high. There is an advantage of providing magnetic flux density.

Meanwhile, in FIG. 4, a consecant pole type motor 200 according to another embodiment of the present invention is shown.

Elements having the same function as in the drawings shown above are denoted by the same reference numerals.

The consequent pole motor 200 further includes spacers 210 respectively installed in the space parts 122.

The spacer 210 is formed in a shape corresponding to the space part 122 so that the outer surface is in close contact with the inner surface of the space part 122. That is, the spacer 210 is formed to decrease in width from one end adjacent to the rotation center of the rotor 120 to the other end adjacent to the edge of the rotor 120, and the outer surface is curved to be concave. Is formed.

The spacer 210 has a relatively heavy one end formed adjacent to the rotation center of the rotor 120, so that the rotor 120 can rotate more stably, so that noise generated when the rotor 120 rotates or It can reduce vibration.

Here, the spacer 210 is made of a non-magnetic material, preferably SUS304. The above-described spacer 210 is formed of a non-magnetic material so that magnetic flux can be introduced from the magnet unit 121, and is installed so as to be in close contact with the inner wall surface of the space part 122, so that the rotor 120 rotates at high speed. Supports the rotor 120 to prevent the rotor 120 from being deformed.

Meanwhile, in FIG. 5, a graph showing a result of a no-load performance test for the consecant pole motor 200 according to the present invention is posted. Here, Analysis is a result of analysis using a motor performance analysis program generally used in the related art, and Test is a result of a no-load performance test by actually manufacturing the consequent pole type motor 200 of the present invention. Referring to the drawings, it can be seen that the consecant pole motor 200 of the present invention provides a numerically excellent level of performance.

Table 1 below shows the results of the load performance test for the consecant pole motor 200 according to the present invention.

Here, CPM_Basic is a conventionally used consecant pole type motor, and CPM_Optimal is a consecant pole type motor 200 according to the present invention. Referring to Table 1, it can be seen that the motor according to the present invention has better performance than the conventional consecant pole type motor.

Meanwhile, in FIG. 6, a consecant pole-type motor 300 according to another embodiment of the present invention is shown.

Referring to the drawings, a first coupling groove 301 and a second coupling groove 302 are formed in the spacer 210 and the rotor 120 of the consecant pole motor 300, respectively.

The first coupling groove 301 is formed on the outer surface of the spacer 210 to be inserted inward to a predetermined depth. Here, the first coupling groove 301 is formed so as to be adjacent to the rotation center of the rotor 120 as it is drawn from the outer surface of the spacer 210 to the inside.

The second binding groove 302 is formed on an inner surface of the space portion opposite to the first binding groove 301 to communicate with the first binding groove 301. At this time, it is preferable that the second coupling groove 302 extends obliquely away from the center of rotation of the rotor 120 as it is drawn into the rotor 120 from the spacer 210.

Meanwhile, the consecant pole motor of the present invention further includes a support member 303 inserted into the first and second coupling grooves 301 and 302 so as to firmly support the spacer 210 with respect to the rotor 120. . Here, the support member 303 is formed to have an inclination corresponding to the inclination of the first binding groove 301. That is, the portion inserted into the first coupling groove 301 of the support member 303 is preferably formed to be inclined to be adjacent to the rotation center of the rotor 120 from the outer surface of the spacer 210 to the inner side. .

As described above, the support member 303 is formed so that the end of the support member 303 drawn into the spacer 210 is inclined to be adjacent to the rotation center of the rotor 120. That is, since the support member 303 is obliquely extended so that its end faces in the direction opposite to the direction of the centrifugal force when the rotor 120 rotates, it is generated when rotating by supporting the spacer 210 more firmly even if the rotor 120 rotates. Noise or vibration can be reduced.

Meanwhile, although not shown in the drawings, a light emitting member capable of generating light of a predetermined color to the outside may be installed on the outer surface of the spacer 210. The operator can easily determine whether the spacer 210 is defective or worn through the light of the light emitting member irradiated to the outside through the outer surface of the spacer 210 and the inner surface of the space part.

The description of the presented embodiments is provided to enable any person skilled in the art to use or practice the present invention. Various modifications to these embodiments will be apparent to those of ordinary skill in the art, and general principles defined herein can be applied to other embodiments without departing from the scope of the present invention. Thus, the present invention is not to be limited to the embodiments presented herein, but is to be construed in the widest scope consistent with the principles and novel features presented herein.

100: consequent pole motor
110: stator
111: hollow
112: Chi
113: winding
120: rotor
121: magnet unit
122: space part
123: first magnetic member
124: second magnetic member

Claims (8)

A stator including a plurality of teeth arranged along a circumferential direction and generating a rotating magnetic field by windings provided on the plurality of teeth; And
A plurality of magnet units provided inside or outside the stator to generate rotational force in coordination with the rotating magnetic field, and a rotor having a plurality of spaces alternately formed along the circumferential direction with respect to the rotation center;
Consecant pole motor.
The method of claim 1,
The magnet unit
A plurality of first magnetic members installed on the rotor such that one end is adjacent to the center of the rotor and extends from the center of rotation of the rotor in the edge direction; And
A plurality of second magnetic members having one end adjacent to the other end of the first magnetic member and extending from the first magnetic member in the direction of the edge of the rotor;
Consecant pole motor.
The method of claim 2,
The first magnetic members are formed such that one end is adjacent to each other, and is spaced apart from each other toward the other end, and the opposite sides are formed to be curved to be concave,
The second magnetic members are formed such that one end is adjacent to the other end of the first magnetic members, respectively, and is formed to be spaced apart from each other toward the other end, and is formed to be curved to convexly opposite sides thereof,
Consecant pole motor.
The method of claim 3,
The space portion is formed to extend in the edge direction from the rotation center of the rotor,
Consecant pole motor.
The method of claim 4,
The space portion is formed to decrease in width from one end adjacent to the rotation center of the rotor to the other end adjacent to the edge of the rotor,
Consecant pole motor.
The method of claim 5,
The space portion is formed to be curved so that the inner surfaces facing each other are convex,
Consecant pole motor.
The method according to any one of claims 4 to 6,
It is installed in the space, is formed in a shape corresponding to the space so that the outer surface is in close contact with the inner surface of the space, and a spacer made of a non-magnetic material; further comprising,
Consecant pole motor.
The method of claim 7,
The spacer is formed to decrease in width from the center of rotation of the rotor toward the edge of the rotor, and a first binding groove is formed on the outer surface to be inserted inward to a predetermined depth,
The first coupling groove is formed to be inclined to be adjacent to the rotation center of the rotor as it is drawn from the outer surface of the spacer to the inside,
The rotor has a second coupling groove formed on an inner surface of the space portion opposite to the first coupling groove,
It is inserted into the first and second coupling grooves to firmly support the spacer with respect to the rotor, and the portion inserted into the first coupling groove rotates from the outer surface of the spacer toward the inside. Further comprising; a support member formed to be inclined to be adjacent to the center,
Consecant pole motor.

Images