Magnet plug-in motor and rotary compressor having same

Abstract

The invention provides a magnet plug-in motor and a rotary compressor having the same. The magnet plug-in motor includes a stator core, a rotor core, a permanent magnet accommodated inside the rotor core, and a rotating shaft provided on an inner side of the rotor core and rotating together with the rotor core; the rotating shaft comprises an upper side part and a lower side part; a plurality of magnet accommodating parts are arranged in the rotor core; the permanent magnet is inserted into the magnet accommodating part; the permanent magnet comprises an upper end, a lower end and a side surface end; the upper end comprises an arc part with radian; the lower end and the two side surface ends form a linear shape.

Description

Technical Field

[0001] The present invention relates to a magnet insertion motor and a rotary compressor having the same, and more specifically, to a magnet insertion motor and a rotary compressor having the same for reducing noise and vibration. Background Technology

[0002] Typically, a motor transmits the rotational force of its rotor to a rotating shaft, which in turn drives the load. For example, the rotating shaft can be connected to and drive the drum of a washing machine, or it can be connected to and drive the fan of a refrigerator to supply cool air to the desired space.

[0003] In this type of motor, the rotor rotates through electromagnetic interaction with the stator. For this purpose, coils are wound around the stator, and the rotor rotates relative to the stator when current is applied to the coils.

[0004] Compressors can be classified into reciprocating compressors, rotary compressors, and scroll compressors based on the way they compress refrigerant. A reciprocating compressor compresses fluid by creating a compression space between the piston and cylinder and by using the linear reciprocating motion of the piston; a rotary compressor compresses fluid by using eccentrically rotating rollers inside the cylinder; and a scroll compressor compresses fluid by using a pair of spiral-shaped scrolls that mesh and rotate together.

[0005] Rotary compressors can be distinguished based on how the rollers rotate relative to the cylinder. For example, rotary compressors can be divided into eccentric rotary compressors, where the rollers rotate eccentrically relative to the cylinder, and concentric rotary compressors, where the rollers rotate concentrically relative to the cylinder.

[0006] Patent document 1 (Japanese application number 2014-110660, 2014.06.12) discloses a magnet insertion motor in which the stator is composed of multiple segments and the inner diameter of the stator increases as it approaches the upper side, thereby increasing the air gap. This improves the torque reduction problem caused by the concentration of magnetic flux on the rotor side in existing patents and can suppress vibration noise caused by rotor swaying.

[0007] As in Patent Document 1, when the motor stator is manufactured in multiple segments, the number of stator cores and the number of molds used to manufacture the stator increase, leading to increased stamping and assembly time during production, thus increasing manufacturing costs. Furthermore, the average air gap between the stator and rotor increases in the stacking length direction, which can reduce motor performance.

[0008] In a rotary compressor, the shaft is supported on one side, and the opposite side of the support is separated from the rotating shaft and moves eccentrically.

[0009] In the electric motor of a rotary compressor, the eccentric rotation of the rotor and shaft causes the upper rotor to wobble, which becomes the cause of noise and vibration.

[0010] To address the problems of the prior art as described above, a scheme was proposed to make the outer diameter of the rotor or the inner diameter of the stator dual. However, this resulted in problems such as increased production process leading to reduced production efficiency and increased average air gap leading to reduced motor efficiency.

[0011] Therefore, there is a need to develop an electric motor with a structure that minimizes the eccentric rotation of the rotor and shaft and the swaying of the upper rotor, which are causes of noise and vibration.

[0012] In addition, there is a need to develop an electric motor that maintains high productivity while minimizing the decline in motor efficiency. Summary of the Invention

[0013] The problem to be solved

[0014] The present invention was proposed to solve the above-mentioned problems. The first objective of the present invention is to provide a magnet insertion motor with a structure that minimizes the eccentric rotation of the rotor and shaft and the swaying of the upper rotor, which are causes of noise and vibration.

[0015] A second objective of the present invention is to provide a magnet insertion motor having a magnet shape and configuration for maintaining high production efficiency and minimizing motor efficiency degradation.

[0016] A third objective of the present invention is to provide a magnet insertion motor that reduces rotor wobble, vibration, and noise by reducing the magnetic pull force (MPF) on the upper side of the stator facing the magnet.

[0017] The fourth objective of this invention is to provide a magnet insertion motor that simplifies the manufacturing process compared to binarizing and stacking the core shape, thereby achieving high production efficiency, reducing material costs, and having an optimized magnet shape.

[0018] Technical solutions to the problem

[0019] To address the aforementioned issues, the magnet insertion motor of the present invention includes: a stator core; a rotor core disposed inside the stator core and configured to be rotatable; a permanent magnet housed inside the rotor core; and a rotating shaft disposed inside the rotor core and rotating together with the rotor core; the rotating shaft includes an upper portion coupled to the rotor core and a lower portion coupled to a load receiving the rotational force of the rotor core; a plurality of magnet receiving portions arranged circumferentially spaced are disposed inside the rotor core; the permanent magnet is inserted into the magnet receiving portion; with respect to the polarity action surface, the permanent magnet includes an upper end facing the upper portion of the rotating shaft, a lower end facing the lower portion of the rotating shaft and the upper end facing the lower portion of the rotating shaft, and two side ends connecting the upper end and the lower end; the upper end includes an arc portion formed with a curvature, and the lower end and the two side ends are formed in a straight line shape.

[0020] Therefore, the magnetic pull force (MPF) on the upper side of the stator core facing the upper side of the magnet is reduced, thereby reducing rotor core wobble and lowering vibration and noise. Furthermore, because the upper and lower parts form an asymmetrical structure, the rotor core wobble is reduced, vibration and noise are lowered, by decreasing the magnetic pull force (MPF) on the upper side of the stator core facing the upper side of the magnet.

[0021] The plurality of magnet receptacles are each composed of a pair of magnet receptacles inserted in a V-shape that is spaced apart from each other as they approach the radially outward side; the pair of magnet receptacles may have a first magnet receptacle and a second magnet receptacle; the permanent magnet may include a first permanent magnet inserted into the first magnet receptacle and a second permanent magnet inserted into the second magnet receptacle.

[0022] Preferably, the lower part of the rotating shaft may include an eccentrically rotating crankshaft.

[0023] This not only reduces cogging torque but also minimizes the decrease in motor efficiency. Furthermore, it reduces material costs by decreasing the amount of magnets used and improves magnet utilization through optimized shape. (This also means that the reduction in cogging torque and the minimization of motor efficiency are not directly related to the previous point about motor efficiency.)

[0024] The first permanent magnet and the second permanent magnet may each have an arc portion on one side of their respective ends, close to each other.

[0025] This configuration allows for reduced material costs by decreasing the amount of magnets used, and improved magnet utilization through an optimized shape. Furthermore, it minimizes motor efficiency degradation while reducing electromagnetic pull.

[0026] The first permanent magnet may have an arc portion on one end near the side of the second permanent magnet, and the second permanent magnet may have an arc portion on one end between the side near the first permanent magnet and the opposite side thereto.

[0027] Therefore, it not only minimizes the decrease in motor efficiency, but also reduces electromagnetic pull.

[0028] The first permanent magnet may have an arc portion on one end near the side of the second permanent magnet, and the second permanent magnet may have an arc portion on one end opposite to the side near the first permanent magnet.

[0029] Therefore, the magnetic pull force (MPF) on the upper side of the stator core facing the upper side of the magnet is reduced, thereby reducing the sway of the rotor core and reducing vibration and noise.

[0030] The first permanent magnet may have an arc portion in the portion between the side of the second permanent magnet and the opposite side at one end, and the second permanent magnet may have an arc portion in the portion of the first permanent magnet at one end.

[0031] Because the first permanent magnet has an arc in the middle part at one end, and the second permanent magnet has an arc on the side close to the first permanent magnet, not only can the cogging torque be reduced, but the decrease in motor efficiency can also be minimized.

[0032] The first permanent magnet may have an arc portion in the portion between the side of the second permanent magnet and the opposite side thereon at one end, and the second permanent magnet may have an arc portion in the portion between the side of the first permanent magnet and the opposite side thereon at one end.

[0033] This not only reduces cogging torque but also minimizes the decrease in motor efficiency.

[0034] The first permanent magnet may have an arc portion in one end between the side of the second permanent magnet and the opposite side thereto, and the second permanent magnet may have an arc portion in one end opposite to the side of the first permanent magnet.

[0035] Therefore, material costs can be reduced by decreasing the amount of magnets used, and magnet utilization can be improved with an optimized shape. In addition, not only can cogging torque be reduced, but the decrease in motor efficiency can also be minimized.

[0036] Preferably, the first magnet receiving portion and the second magnet receiving portion can be alternately arranged circumferentially on the outer side of the rotor core.

[0037] Curvature portions may be provided on one side and the other side of the arc portion of the first permanent magnet and the second permanent magnet, respectively.

[0038] An edge removal area may be provided between the two sides of the arc portion, the first magnet receiving portion and the second magnet receiving portion, and the sidewalls of the first magnet receiving portion and the second magnet receiving portion.

[0039] Therefore, material costs can be reduced by decreasing the amount of magnets used, and magnet utilization can be improved with an optimized shape. In addition, not only can cogging torque be reduced, but the decrease in motor efficiency can also be minimized.

[0040] The stator core may be provided with teeth that extend radially to form an air gap with the outer periphery of the rotor core, and the corner removal area may overlap with the teeth in the circumferential direction.

[0041] With this configuration, the electromagnetic pull on the upper side of the stator core facing the upper side of the magnet is reduced, thereby reducing the swaying of the rotor core and lowering vibration and noise.

[0042] A protruding bridging portion may be provided, which protrudes from the surface between the first magnet receiving portion and the second magnet receiving portion, to define one side of the corner removal area between the first magnet receiving portion and the second magnet receiving portion.

[0043] The protruding bridging portion may have a predetermined width and extend axially to support the sides of the first permanent magnet and the second permanent magnet.

[0044] The curvature of the side of the arc portion of the first permanent magnet and the second permanent magnet that is close to each other can be less than the curvature of the opposite side of the arc portion.

[0045] The curvature of the arc portion of the first permanent magnet on the side closer to the second permanent magnet can be less than the curvature of the opposite side, and the curvature of the arc portion of the second permanent magnet on the side closer to the first permanent magnet and the opposite side can be the same.

[0046] The curvature of the arc portion of the first permanent magnet on the side closer to the second permanent magnet can be less than the curvature of the opposite side, and the curvature of the arc portion of the second permanent magnet on the side closer to the first permanent magnet can be greater than the curvature of the opposite side.

[0047] The curvature of the arc portion of the first permanent magnet on the side closest to the second permanent magnet and the opposite side thereto can be the same, and the curvature of the arc portion of the second permanent magnet on the side closest to the first permanent magnet can be less than the curvature of the opposite side thereto.

[0048] The rotary compressor of the present invention may include: a housing forming the exterior; a cylinder disposed inside the housing, having a compression space on the inner circumferential surface of the cylinder, the cylinder being provided with an intake port communicating with the compression space to allow refrigerant to be drawn in; rollers rotatably disposed in the compression space of the cylinder; and the magnet insertion motor.

[0049] Invention Effects

[0050] In the magnet insertion motor of the present invention, an arc portion with an arc shape is provided at one end of the first permanent magnet and the second permanent magnet, thereby reducing the magnetic pull of the stator core on the upper side facing the upper side of the permanent magnet, thus reducing the wobbling of the rotor core, thereby reducing vibration and noise.

[0051] Furthermore, since the magnet insertion motor of the present invention does not binarize and stack the shape of the rotor core, the manufacturing process is simplified, thereby increasing production efficiency.

[0052] In addition, the magnet insertion motor of the present invention can reduce material costs by reducing the amount of magnets used, and can improve magnet utilization by optimizing the shape. Attached Figure Description

[0053] Figure 1 This is a cross-sectional view showing the rotary compressor of the present invention.

[0054] Figure 2 This is a perspective view of the magnet insertion motor of the present invention viewed from one side.

[0055] Figure 3 This is a top view showing a portion of the magnet insertion motor of the present invention.

[0056] Figure 4 This is a front view showing an example of the permanent magnet of the present invention.

[0057] Figure 5 This is a front view showing another example of the permanent magnet of the present invention.

[0058] Figure 6 This is a front view showing yet another example of the permanent magnet of the present invention.

[0059] Figure 7 This is a top view showing the configuration of the first and second permanent magnets in scenario 2.

[0060] Figure 8 This is a top view showing the configuration of the first and second permanent magnets in scenario 3.

[0061] Figure 9 This is a top view showing the configuration of the first and second permanent magnets in scenario 4.

[0062] Figure 10 This is a top view showing the configuration of the first and second permanent magnets in scenario 5.

[0063] Figure 11 This is a top view showing the configuration of the first and second permanent magnets in scenario 6.

[0064] Figure 12 This is a top view showing the configuration of the first and second permanent magnets in scenario 7.

[0065] Figure 13 This is a top view showing the configuration of the first and second permanent magnets in scenario 8.

[0066] Figure 14 This is a top view showing the configuration of the first and second permanent magnets in scenario 9.

[0067] Figure 15 The curves show the electromagnetic force (MPF) and motor efficiency for each case.

[0068] Figure 16 It shows the curves of cogging torque and motor efficiency for each case. Detailed Implementation

[0069] Hereinafter, a detailed description of the magnet insertion motor and the rotary compressor having the same according to the present invention will be provided with reference to an embodiment shown in the accompanying drawings. In the following description, descriptions of certain constituent elements may be omitted to clearly highlight the features of the present invention.

[0070] Furthermore, in the following description, "upper side" refers to the direction away from the support surface that supports the magnet insertion motor and rotary compressor of the embodiment of the present invention; that is, if the electric motor 120 and the compression unit are taken as the center, the compression unit side is the upper side. "Lower side" refers to the direction closer to the support surface; that is, if the electric motor 120 and the compression unit are taken as the center, the electric motor 120 side is the lower side.

[0071] Additionally, in the following description, the term "axial" refers to the length direction of the rotation axis 125. It can be understood that "axial" is the vertical direction. "Radial" refers to the direction intersecting the rotation axis 125.

[0072] Figure 1 An example of a rotary compressor is shown.

[0073] Reference Figure 1The rotary compressor may include: a housing 110 forming the exterior; a cylinder 133 disposed inside the housing 110, having a compression space V on the inner circumferential surface of the cylinder 133, and having an intake port communicating with the compression space V to allow refrigerant to be drawn in; a roller 134 rotatably disposed in the compression space of the cylinder 133; and a magnet insertion motor 120 described later.

[0074] As an example, a magnet insertion motor may include: a stator 121 which is coupled to the inner periphery of a housing 110; and a rotor 122 which is rotatably disposed on the inner periphery of the stator 121, with a rotating shaft 125 disposed inside the rotor 122.

[0075] The housing 110 forms the exterior of the compressor. The housing 110 can be either longitudinal or transverse depending on the compressor's mounting method. A longitudinal housing has the magnet-inserted motor 120 and the compressor unit 130 arranged axially on the upper and lower sides, while a transverse housing has the magnet-inserted motor 120 and the compressor unit 130 arranged on the left and right sides. This embodiment will be described with a focus on the longitudinal housing 110, but its application to a transverse housing is not excluded.

[0076] The housing 110 may include a cylindrical intermediate housing 111, a lower housing 112 covering the lower end of the intermediate housing 111, and an upper housing 113 covering the upper end of the intermediate housing 111.

[0077] The inner circumferential surface of the cylinder 133 is annular and forms a compression space V. In addition, the cylinder 133 has a suction port 1331, which is configured to communicate with the compression space V to draw in refrigerant and supply it to the compression space V.

[0078] The inner circumferential surface of the cylinder 133 can be formed into an elliptical shape. As an example, the inner circumferential surface of the cylinder 133 can be formed into an asymmetrical elliptical shape by combining a plurality of ellipses.

[0079] Roller 134 is rotatably disposed in compression space V of cylinder 133. In addition, a plurality of blade slots (not shown) are formed along the outer peripheral surface of roller 134 at predetermined intervals. Furthermore, compression space V is formed between the inner periphery of cylinder 133 and the outer periphery of roller 134.

[0080] The lower portion 125b of the rotating shaft 125 may include an eccentrically rotating crankshaft 125c. The crankshaft 125c may be a portion inserted into the inner circumference of the roller 134.

[0081] That is, the compression space V is the space formed between the inner circumferential surface of the cylinder 133 and the outer circumferential surface of the roller 134. In addition, the compression space V is divided into spaces corresponding to the number of blades by a plurality of blades (not shown).

[0082] The blade (not shown) is configured to be slidably inserted into a blade slot and rotate together with the roller 134. In addition, the rear end of the blade is provided with back pressure, so that the front end of the blade contacts the inner circumference of the cylinder 133.

[0083] The magnet insertion motor 120 can be installed in the upper inner space 110a of the housing 110, and the compression part 130 can be installed in the lower inner space 110a of the housing 110. The magnet insertion motor 120 and the compression part 130 can be connected by a rotating shaft 125.

[0084] The magnet insertion motor 120 is part of the electric motor unit, which provides power to drive the compression unit 130. The magnet insertion motor 120 includes a stator 121, a rotor 122, and a rotating shaft 125.

[0085] The stator 121 can be fixedly disposed inside the housing 110, and can be pressed into and fixed to the inner circumferential surface of the housing 110 by means of thermoforming or other means. For example, the stator 121 can be pressed into and fixed to the inner circumferential surface of the intermediate housing 111. The stator 121 can have a stator core 121a, which will be described later. A coil can be wound on the stator core 121a.

[0086] The rotor 122 is rotatably inserted into the stator 121, and the rotating shaft 125 is pressed in and engaged at the center of the rotor 122. Thus, the rotating shaft 125 rotates together with the rotor 122. The rotor 122 may have a rotor core 122a, described later.

[0087] As described later, the rotating shaft 125 includes an upper portion 125a that is coupled to the rotor core 122a and a lower portion 125b that is coupled to a load that receives the rotational force of the rotor core 122a.

[0088] The upper part 125a may be a rotor or a rotor core side portion. The lower part 125b may be a portion incorporating a load or compression section.

[0089] In this invention, due to the eccentric movement of the compression section, the swaying of the load side (lower side) of the rotor may be greater than that of the upper side.

[0090] If an external power source is applied to the coils of the stator core 121a, a magnetic field can be formed around the coils of the stator. The rotor 122 and the rotating shaft 125 coupled to the rotor 122 can rotate through electromagnetic interaction with the stator 121.

[0091] The rotor 122 may be provided with ventilation holes 122a that are formed through the upper and lower sides. Through the ventilation holes 122a, the airflow of refrigerant discharged from the compressor section can flow upward.

[0092] An oil flow path in the shape of a hollow hole can be formed at the center of the rotating shaft 125.

[0093] An oil suction device (not shown) is provided in the middle or lower end of the oil flow path, so that the oil in the oil storage space can be sucked up and supplied to the sliding part.

[0094] Alternatively, the rotating shaft 125 can be integrally formed with the roller 134 or assembled later after being pressed into the roller 134.

[0095] The rotary compressor of the present invention may further include a main bearing 131 and a secondary bearing 132. The main bearing 131 and the secondary bearing 132 may be respectively disposed at both ends of the cylinder 133. The main bearing 131 and the secondary bearing 132 are configured to be spaced apart from each other and respectively form two sides of the aforementioned compression space V.

[0096] In the rotary compressor of the present invention, the rotating shaft 125 of the magnet insertion motor is assembled into a structure in which it is supported on one side at the lower end of the mechanism. Therefore, when the rotary compressor is running, the opposite side of the one-sided support of the rotating shaft 125 is separated from the rotating shaft 125 and rotates eccentrically. The eccentricity of the rotating shaft 125 at this time causes the air gap 121c on the upper part of the stator and rotor of the motor to be uneven, and generates electromagnetic pull in the direction of increasing eccentricity of the rotating shaft 125. Therefore, there is a problem of increased vibration and noise of the compressor.

[0097] This invention proposes an asymmetrical magnet structure and configuration at the upper and lower ends of a rotary compressor, which can reduce vibration and noise by improving the eccentric rotation characteristics generated in the single-sided support structure of the rotating shaft 125.

[0098] The magnet insertion motor of the present invention includes: a stator core 121a; a rotor core 122a disposed inside the stator core 121a and configured to be rotatable; permanent magnets 123 and 124 housed inside the rotor core 122a; and a rotating shaft 125 disposed on one side inside the rotor core 122a and rotating together with the rotor core 122a.

[0099] The rotating shaft 125 includes an upper portion 125a that is coupled to the rotor core 122a and a lower portion 125b that is coupled to a load that receives the rotational force of the rotor core 122a.

[0100] Inside the rotor core 122a, there are a plurality of magnet housings 122b and 122c arranged circumferentially.

[0101] Permanent magnets 123 and 124 are inserted into magnet receiving parts 122b and 122c.

[0102] The permanent magnets 123 and 124 include, with reference to the polarity action surface, an upper end facing the upper side portion 125a of the rotation shaft 125, a lower end 123f and 124f facing the upper end and the lower side portion 125b of the rotation shaft 125, and two side ends 123k and 124k connecting the upper end and the lower end 123f and 124f.

[0103] The upper end includes arcs 123a and 124a with curvature, and the lower end 123f and 124f and the two side ends 123k and 124k are formed in a straight line shape.

[0104] As an example, the motor of the present invention can be a linear IPM type motor.

[0105] This invention can minimize the eccentric rotation of the rotor and rotating shaft 125, and the wobbling of the upper rotor core 122a, which are causes of noise and vibration. In particular, it can minimize the decrease in motor efficiency while maintaining high production efficiency.

[0106] The present invention provides arc portions 123a and 124a at the upper ends of the first permanent magnet 123 and the second permanent magnet 124, thereby minimizing the swaying of the upper part of the rotor.

[0107] In addition, the present invention can reduce the noise and vibration sources generated during eccentric operation.

[0108] As an example, a plurality of magnet receptacles 122b, 122c may each be composed of a pair of magnet receptacles 122b, 122c that are inserted into each other in a V-shape as they approach the radially outward side.

[0109] A pair of magnet receiving portions 122b and 122c may have a first magnet receiving portion 122b and a second magnet receiving portion 122c.

[0110] The permanent magnets 123 and 124 may include a first permanent magnet 123 inserted into the first magnet receiving portion 122b and a second permanent magnet 124 inserted into the second magnet receiving portion 122c.

[0111] The lower part 125b of the rotating shaft 125 may include an eccentrically rotating crankshaft 125c.

[0112] As an example, the motor of the present invention can be a V-shaped IPM type motor.

[0113] A first magnet receiving portion 122b and a second magnet receiving portion 122c, which are formed to cross each other, may be provided on one side of the rotor core 122a.

[0114] The permanent magnets 123 and 124 may include a first permanent magnet 123 and 124 housed in a first magnet housing portion 122b and a second permanent magnet 123 and 124 housed in a second magnet housing portion 122c.

[0115] The first permanent magnet 123 and the second permanent magnet 124 may be provided with arc-shaped portions 123a and 124a at their upper ends.

[0116] Figure 2 This is a perspective view of the magnet insertion motor of the present invention viewed from one side. Figure 3 This is a top view showing a portion of the magnet insertion motor of the present invention.

[0117] In this invention, Figure 2 An example is shown where a first permanent magnet 123 and a second permanent magnet 124 are disposed on a rotor core 122a.

[0118] The first permanent magnet 123 and the second permanent magnet 124 are respectively housed in the first magnet housing portion 122b and the second magnet housing portion 122c.

[0119] The first magnet receiving portion 122b and the second magnet receiving portion 122c can form a predetermined angle on one side of the rotor core 122a and be arranged to cross each other.

[0120] A protruding bridging portion 122d may be provided between the first magnet receiving portion 122b and the second magnet receiving portion 122c. The protruding bridging portion 122d may be disposed between the first permanent magnet 123 and the second permanent magnet 124.

[0121] The protruding bridging portion 122d can be formed by protruding from the surface between the first magnet receiving portion 122b and the second magnet receiving portion 122c. The protruding bridging portion 122d can have a predetermined width. The protruding bridging portion 122d can be formed by extending axially in the direction that extends as the rotation axis 125.

[0122] With the structure described above, the protruding bridging portion 122d can define one side of the corner removal area.

[0123] In addition, the protruding bridging portion 122d can support the first permanent magnet 123 and the second permanent magnet 124 between the first permanent magnet 123 and the second permanent magnet 124.

[0124] In this invention, for ease of explanation, when observing the first permanent magnet 123 and the second permanent magnet 124 with the portion where the rotation shaft 125 is located, which is the center of the rotor core 122a, the positions are designated as left, right, or middle to indicate that the arc portions 123a and 124a are formed at the left, right, or middle positions. That is, the left and right sides are defined as when viewed from the inside of the rotor core 122a or from the center where the rotation shaft 125 is located.

[0125] Figure 4 This is a front view of an example of the permanent magnets 123 and 124 of the present invention.

[0126] Reference Figure 4 An example is shown where an arc portion 123a, 124a is provided on the left side of the upper end of the permanent magnets 123, 124.

[0127] A first curvature portion 123b may be provided on one side of the arc portions 123a and 124a, and a second curvature portion 123c may be provided on the other side of the arc portions 123a and 124a.

[0128] The first curvature section 123b and the second curvature section 123c can be divided based on the end of the arc section 123a.

[0129] exist Figure 4 In this design, a first curvature portion 123b can be provided at the left end of the arc portions 123a and 124a, and a second curvature portion 123c can be provided at the right end. The first curvature portion 123b and the second curvature portion 123c can each have a predetermined curvature different from each other. For example, the curvature of the first curvature portion 123b can be less than the curvature of the second curvature portion 123c. Curvature and radius of curvature are inversely proportional or reciprocals of each other. That is, the radius of curvature of the first curvature portion 123b can be greater than the radius of curvature of the second curvature portion 123c.

[0130] A first corner removal area 123d and a second corner removal area 123e can be respectively provided on both sides of the arc 123a and 124a.

[0131] The first corner removal area 123d and the second corner removal area 123e can be areas defined by the two sides of the arc portions 123a and 124a, the first magnet receiving portion 122b and the second magnet receiving portion 122c, and the sidewall or bridging portion connecting the first magnet receiving portion 122b and the second magnet receiving portion 122c.

[0132] As an example, the first curvature portion 123b may have a first corner removal region 123d, and the second curvature portion 123c may have a second corner removal region 123e.

[0133] The first corner removal area 123d and the second corner removal area 123e are the portions around the arc portions 123a and 124a of the permanent magnets 123 and 124 where no magnets are provided. That is, it can be understood that the first corner removal area 123d and the second corner removal area 123e are the portions where corners should be formed when the permanent magnets 123 and 124 are formed in a quadrilateral shape, and are the peripheral spaces generated as the arc portions 123a and 124a are formed.

[0134] With the first corner removal area 123d and the second corner removal area 123e provided, the magnetic pull on the upper side of the tooth 121b portion on the stator core 121a side is reduced, thereby reducing the sway of the rotor core 122a and decreasing vibration and noise.

[0135] In addition, material costs can be reduced by decreasing the amount of magnets used, and magnet utilization can be improved by optimizing the shape.

[0136] Permanent magnets 123 and 124 can have a width W and a height H.

[0137] The width of permanent magnets 123 and 124 can be the distance from the left end to the right end. In addition, the height of permanent magnets 123 and 124 can be the shortest distance from the bottom end to the end of the arc 123a and 124a.

[0138] As an example, the width W of permanent magnets 123 and 124 can be more than 5 mm and less than 10 mm.

[0139] As an example, the height H of permanent magnets 123 and 124 can be more than 25mm and less than 60mm.

[0140] The vertical distance X11 from the upper end of the arc portion 123a, 124a to the lower end of the first curvature portion 123b can be less than half the height H of the permanent magnets 123, 124.

[0141] As an example, the vertical distance X11 from the upper end of the arc portion 123a, 124a to the lower end of the first curvature portion 123b can be more than 12.5mm and less than 30mm.

[0142] The vertical distance X12 from the upper end of the arc portion 123a, 124a to the lower end of the second curvature portion 123c can be less than half the height H of the permanent magnets 123, 124.

[0143] As an example, the vertical distance X12 from the upper end of the arc portion 123a, 124a to the lower end of the second curvature portion 123c can be 12.5mm or more and 30mm or less.

[0144] The distance between the first curvature portions 123b can be greater than half the width W of the permanent magnets 123 and 124. The distance between the first curvature portions 123b can be the distance along the arc between the two ends of the first curvature portions 123b. As an example, the distance between the first curvature portions 123b can be 5 mm or more.

[0145] The distance of the second curvature portion 123c can be greater than half the width W of the permanent magnets 123 and 124. The distance of the second curvature portion 123c can be the distance along the arc between the two ends of the second curvature portion 123c. As an example, the distance of the second curvature portion 123c can be 5 mm or more.

[0146] Figure 5 This is a front view showing another example of the permanent magnet of the present invention.

[0147] Reference Figure 5 An example is shown where an arc portion 123a, 124a is provided in the middle between the left and right sides of the upper end of the permanent magnets 123, 124.

[0148] A third curvature section 123g may be provided on one side of the arc sections 123a and 124a, and a fourth curvature section 123h may be provided on the other side of the arc sections 123a and 124a.

[0149] exist Figure 5 In this configuration, a third curvature portion 123g may be provided at the left end of the arc portions 123a and 124a, and a fourth curvature portion 123h may be provided at the right end of the arc portions 123a and 124a. As an example, the third curvature portion 123g and the fourth curvature portion 123h may have the same predetermined curvature to be symmetrical to each other.

[0150] The third curvature section 123g may be provided with a third corner removal area 123d, and the fourth curvature section 123h may be provided with a fourth corner removal area 123e.

[0151] With the third corner removal area 123d and the fourth corner removal area 123e provided, the magnetic pull on the upper side of the tooth 121b portion on the stator core 121a side is reduced, thereby reducing the sway of the rotor core 122a and decreasing vibration and noise.

[0152] In addition, material costs can be reduced by decreasing the amount of magnets used, and magnet utilization can be improved by optimizing the shape.

[0153] Permanent magnets 123 and 124 can have a width W and a height H.

[0154] The width of permanent magnets 123 and 124 can be the distance from the left end to the right end. In addition, the height of permanent magnets 123 and 124 can be the shortest distance from the bottom end to the end of the arc 123a and 124a.

[0155] As an example, the width W of permanent magnets 123 and 124 can be more than 5 mm and less than 10 mm.

[0156] As an example, the height H of permanent magnets 123 and 124 can be more than 25mm and less than 60mm.

[0157] The vertical distance X11 from the upper end of the arc 123a, 124a to the lower end of the third curvature section 123g or the fourth curvature section 123h can be less than half the height H of the permanent magnets 123, 124.

[0158] As an example, the vertical distance X11 from the upper end of the arc portion 123a or 124a to the lower end of the third curvature portion 123g or the fourth curvature portion 123h can be 12.5mm or more and 30mm or less.

[0159] The distance between the third curvature section 123g or the fourth curvature section 123h can be greater than half the width W of the permanent magnets 123 and 124. The distance between the third curvature section 123g or the fourth curvature section 123h can be the distance along the arc between the two ends of the third curvature section 123g or the fourth curvature section 123h. For example, the distance between the third curvature section 123g or the fourth curvature section 123h can be 5 mm or more.

[0160] Figure 6 This is a front view showing yet another example of the permanent magnet of the present invention.

[0161] Figure 6 Another example of the first permanent magnet 123 and the second permanent magnet 124 of the present invention is shown.

[0162] As mentioned above, in this invention, for ease of explanation, the left, right, or middle positions are named based on the direction of the first permanent magnet 123 and the second permanent magnet 124 as viewed from the part where the rotation shaft 125 is provided at the center of the rotor core 122a, so as to explain that the arc portions 123a and 124a are formed at the left, right, or middle positions.

[0163] Reference Figure 6 An example is shown where an arc portion 123a, 124a is provided on the right side of the upper end of the permanent magnets 123, 124.

[0164] A fifth curvature section 123i may be provided on one side of the arc sections 123a and 124a, and a sixth curvature section 123j may be provided on the other side of the arc sections 123a and 124a.

[0165] exist Figure 6 In this design, a fifth curvature section 123i can be provided at the left end of the arc sections 123a and 124a, and a sixth curvature section 123j can be provided at the right end of the arc sections 123a and 124a. The fifth curvature section 123i and the sixth curvature section 123j can have predetermined curvatures that are different from each other. As an example, the curvature of the fifth curvature section 123i can be greater than the curvature of the sixth curvature section 123j. Curvature and radius of curvature are inversely proportional or reciprocals of each other. That is, the radius of curvature of the fifth curvature section 123i can be smaller than the radius of curvature of the sixth curvature section 123j.

[0166] The fifth curvature part 123i may have a fifth corner removal region 123d, and the sixth curvature part 123j may have a sixth corner removal region 123e.

[0167] With the fifth corner removal area 123d and the sixth corner removal area 123e provided, the magnetic pull on the upper side of the tooth 121b portion on the stator core 121a side is reduced, thereby reducing the sway of the rotor core 122a and decreasing vibration and noise.

[0168] In addition, material costs can be reduced by decreasing the amount of magnets used, and magnet utilization can be improved by optimizing the shape.

[0169] Permanent magnets 123 and 124 can have a width W and a height H.

[0170] The width of permanent magnets 123 and 124 can be the distance from the left end to the right end. In addition, the height of permanent magnets 123 and 124 can be the shortest distance from the bottom end to the end of the arc 123a and 124a.

[0171] As an example, the width W of permanent magnets 123 and 124 can be more than 5 mm and less than 10 mm.

[0172] As an example, the height H of permanent magnets 123 and 124 can be more than 25mm and less than 60mm.

[0173] The vertical distance X31 from the upper end of the arcs 123a and 124a to the lower end of the fifth curvature section 123i can be less than half the height H of the permanent magnets 123 and 124.

[0174] As an example, the vertical distance X31 from the upper end of the arc portion 123a, 124a to the lower end of the fifth curvature portion 123i can be 12.5mm or more and 30mm or less.

[0175] The vertical distance X32 from the upper end of the arcs 123a and 124a to the lower end of the sixth curvature section 123j can be less than half the height H of the permanent magnets 123 and 124.

[0176] As an example, the vertical distance X32 from the upper end of the arc portion 123a, 124a to the lower end of the sixth curvature portion 123j can be 12.5mm or more and 30mm or less.

[0177] The distance of the fifth curvature section 123i can be greater than half the width W of the permanent magnets 123 and 124. The distance of the fifth curvature section 123i can be the distance along the arc between the two ends of the fifth curvature section 123i. As an example, the distance of the fifth curvature section 123i can be 5 mm or more.

[0178] The distance of the sixth curvature section 123j can be greater than half the width W of the permanent magnets 123 and 124. The distance of the sixth curvature section 123j can be the distance along the arc between the two ends of the sixth curvature section 123j. As an example, the distance of the sixth curvature section 123j can be 5 mm or more.

[0179] The following explains the configuration of permanent magnets 123 and 124 to reduce electromagnetic pull force (MPF) or cogging torque.

[0180] In a magnet insertion motor, the electromagnetic pull (MPF) is the force exerted by permanent magnets 123 and 124 in the radial direction on the teeth 121b of the stator core 121a. When the upper air gap 121c of the magnet insertion motor becomes smaller due to the eccentricity of the rotating shaft 125 inside the rotor in the compression section, the electromagnetic pull (MPF) increases, leading to increased vibration and noise.

[0181] In this invention, in order to reduce the swaying of the upper part of the rotor core 122a, the permanent magnets 123 and 124 are shaped to have arc portions 123a and 124a. This reduces the swaying of the rotor core 122a by reducing the electromagnetic pull force (MPF), thereby reducing vibration and noise.

[0182] exist Figure 15 The curves show the electromagnetic pull (MPF) characteristics based on the air gap 121c of the rotor core 122a and stator core 121a. It can be confirmed that the smaller the air gap 121c, the greater the electromagnetic pull (MPF), and conversely, the larger the air gap 121c, the smaller the electromagnetic pull (MPF), i.e., they are inversely proportional.

[0183] First, scenarios 1 to 3, which are configurations that are advantageous for reducing electromagnetic pull, will be explained.

[0184] In scenario 1, the first permanent magnet 123 and the second permanent magnet 124 each have an arc portion 123a and 124a on their respective upper ends, which are close to each other.

[0185] Compared to other cases, in case 1, the arc portions 123a, 124a of the first permanent magnets 123, 124 and the arc portions 123a, 124a of the second permanent magnets 123, 124 are as close as possible.

[0186] exist Figure 2 and Figure 3 In the rotor core 122a, the first magnet receiving portion 122b and the second magnet receiving portion 122c are formed to cross each other on one side. Furthermore, the first magnet receiving portion 122b and the second magnet receiving portion 122c can be paired and alternately arranged on the outer side of the rotor core 122a, showing two pairs of continuously arranged portions.

[0187] Taking the portion with the rotating shaft 125 at the center of the rotor core 122a as a reference, a first magnet receiving portion 122b is arranged on the left side, and a second magnet receiving portion 122c is arranged on the right side. The first magnet receiving portion 122b and the second magnet receiving portion 122c are connected so that they can cross each other.

[0188] Arc portions 123a and 124a are formed on the upper right side of the first permanent magnets 123 and 124 housed in the first magnet housing 122b, and arc portions 123a and 124a are formed on the upper left side of the second permanent magnets 123 and 124 housed in the second magnet housing 122c.

[0189] As described above, the first permanent magnet 123 and the second permanent magnet 124 each have an arc portion 123a and 124a formed on their respective upper ends, close to each other.

[0190] like Figure 2 and Figure 3 As shown, in the first permanent magnet 123 and the second permanent magnet 124, the curvature of the side 124b, 123j of the arc portions 123a, 124a that are close to each other can be less than the curvature of the opposite side 123i, 124c of the arc portions 123a, 124a.

[0191] Therefore, it not only minimizes the decrease in motor efficiency, but also reduces electromagnetic pull.

[0192] In scenario 2, the first permanent magnets 123 and 124 have arcuate portions 123a and 124a on the upper end near the side of the second permanent magnets 123 and 124. The second permanent magnets 123 and 124 have arcuate portions 123a and 124a in the middle portion between the side of the upper end near the first permanent magnets 123 and 124 and the opposite side.

[0193] Figure 7 This is a top view showing the configuration of the first and second permanent magnets in scenario 2.

[0194] exist Figure 7In the rotor core 122a, the first magnet receiving portion 122b and the second magnet receiving portion 122c are formed to cross each other on one side. Furthermore, the first magnet receiving portion 122b and the second magnet receiving portion 122c can be paired and alternately arranged on the outer side of the rotor core 122a; two pairs of continuously arranged portions are shown in the accompanying drawings.

[0195] Taking the portion with the rotating shaft 125 at the center of the rotor core 122a as a reference, a first magnet receiving portion 122b is arranged on the left side, and a second magnet receiving portion 122c is arranged on the right side. The first magnet receiving portion 122b and the second magnet receiving portion 122c are connected so that they can cross each other.

[0196] Arc portions 123a and 124a are formed on the upper right side of the first permanent magnets 123 and 124 housed in the first magnet housing 122b, and arc portions 123a and 124a are formed at the middle position between the upper right and left sides of the second permanent magnets 123 and 124 housed in the second magnet housing 122c.

[0197] As described above, the first permanent magnets 123 and 124 have arcuate portions 123a and 124a on the upper end near the side of the second permanent magnets 123 and 124. The second permanent magnets 123 and 124 have arcuate portions 123a and 124a in the middle portion between the side of the upper end near the first permanent magnets 123 and 124 and the opposite side.

[0198] As an example, refer to Figure 5 to Figure 7 In the first permanent magnet 123, the curvature of the side 123j of the arc portion 123a that is closer to the second permanent magnet 124 can be less than the curvature of the opposite side 123i. In the second permanent magnet 124, the curvature of the side 124d of the arc portion 124a that is closer to the first permanent magnet 123 and the opposite side 123h can be the same as each other.

[0199] Therefore, it not only minimizes the decrease in motor efficiency, but also reduces electromagnetic pull.

[0200] In scenario 3, the first permanent magnets 123 and 124 have arcuate portions 123a and 124a on the upper end near the side of the second permanent magnets 123 and 124. The second permanent magnets 123 and 124 have arcuate portions 123a and 124a on the upper end opposite to the side near the first permanent magnets 123 and 124.

[0201] Figure 8 This is a top view showing the configuration of the first and second permanent magnets in scenario 3.

[0202] exist Figure 8In the rotor core 122a, the first magnet receiving portion 122b and the second magnet receiving portion 122c are formed to cross each other on one side. Furthermore, the first magnet receiving portion 122b and the second magnet receiving portion 122c can be paired and alternately arranged on the outside of the rotor core 122a, showing a portion where only two pairs (first magnet receiving portion 122b and second magnet receiving portion 122c) of the rotor core 122a are cut apart and arranged continuously.

[0203] Taking the portion with the rotating shaft 125 at the center of the rotor core 122a as a reference, a first magnet receiving portion 122b is arranged on the left side, and a second magnet receiving portion 122c is arranged on the right side. The first magnet receiving portion 122b and the second magnet receiving portion 122c are connected so that they can cross each other.

[0204] Arc portions 123a and 124a are formed on the upper right side of the first permanent magnets 123 and 124 housed in the first magnet housing 122b, and arc portions 123a and 124a are formed on the upper right side of the second permanent magnets 123 and 124 housed in the second magnet housing 122c.

[0205] As described above, in case 3, the first permanent magnets 123 and 124 have arcuate portions 123a and 124a on the upper end near the side of the second permanent magnets 123 and 124. The second permanent magnets 123 and 124 have arcuate portions 123a and 124a on the upper end opposite to the side near the first permanent magnets 123 and 124.

[0206] Reference Figure 6 and Figure 8 In the first permanent magnet 123, the curvature of the side 123j of the arc portion 123a that is closer to the second permanent magnet 124 can be less than the curvature of the opposite side 123i. In the second permanent magnet 124, the curvature of the side 124i of the arc portion 124a that is closer to the first permanent magnet 123 can be greater than the curvature of the opposite side 124j.

[0207] Therefore, it not only minimizes the decrease in motor efficiency, but also reduces electromagnetic pull.

[0208] Figure 15 The curves show the electromagnetic force (MPF) and motor efficiency for each case.

[0209] Reference Figure 15 The extent of the decrease in electromagnetic pull (MPF) and motor efficiency can be determined according to each situation.

[0210] In scenarios 1 through 3, the electromagnetic pull force (MPF) decreased by 27%, and the motor efficiency decreased by approximately 17–18%.

[0211] Compared with the permanent magnet configurations 123 and 124 in Situations 4 to 9, the permanent magnet configurations 123 and 124 in Situations 1 to 3 can minimize the decrease in motor efficiency and minimize the electromagnetic pull force (MPF), which will be explained later.

[0212] In case 4, the first permanent magnets 123 and 124 have arcuate portions 123a and 124a in the upper part between the side of the first permanent magnet 123 and 124 that is close to the second permanent magnet 123 and 124 and the opposite side thereto.

[0213] The second permanent magnets 123 and 124 have arc-shaped portions 123a and 124a on the upper end near the side of the first permanent magnets 123 and 124.

[0214] Figure 9 This is a top view showing the configuration of the first and second permanent magnets in scenario 4.

[0215] exist Figure 9 In the rotor core 122a, the first magnet receiving portion 122b and the second magnet receiving portion 122c are formed to cross each other on one side. Furthermore, the first magnet receiving portion 122b and the second magnet receiving portion 122c can be paired and alternately arranged on the outer side of the rotor core 122a, showing two pairs of continuously arranged portions.

[0216] Taking the portion with the rotating shaft 125 at the center of the rotor core 122a as a reference, a first magnet receiving portion 122b is arranged on the left side, and a second magnet receiving portion 122c is arranged on the right side. The first magnet receiving portion 122b and the second magnet receiving portion 122c are connected so that they can cross each other.

[0217] Arc portions 123a and 124a are formed at the middle position between the upper right and left sides of the first permanent magnets 123 and 124 housed in the first magnet housing 122b, and arc portions 123a and 124a are formed on the upper left side of the second permanent magnets 123 and 124 housed in the second magnet housing 122c.

[0218] As described above, in case 4, the first permanent magnets 123 and 124 have arcuate portions 123a and 124a in the upper end between the side of the first permanent magnets 123 and 124 and the opposite side thereof, and the second permanent magnets 123 and 124 have arcuate portions 123a and 124a in the upper end between the side of the first permanent magnets 123 and 124.

[0219] Reference Figure 4 , Figure 5 as well as Figure 9In the first permanent magnet 123, the curvature of the side 123h of the arc portion 123a closest to the second permanent magnet 124 and the opposite side 123g can be the same as each other. In the second permanent magnet 124, the curvature of the side 124b of the arc portion 124a closest to the first permanent magnet 123 can be less than the curvature of the opposite side 124c.

[0220] This not only reduces cogging torque but also minimizes the decrease in motor efficiency.

[0221] In scenario 5, the first permanent magnets 123 and 124 have arcuate portions 123a and 124a in the upper ends between the side of the first permanent magnets 123 and 124 and the opposite side thereof. The second permanent magnets 123 and 124 also have arcuate portions 123a and 124a in the upper ends between the side of the first permanent magnets 123 and 124 and the opposite side thereof.

[0222] Figure 10 This is a top view showing the configuration of the first and second permanent magnets in scenario 5.

[0223] exist Figure 10 In the rotor core 122a, the first magnet receiving portion 122b and the second magnet receiving portion 122c are formed to cross each other on one side. Furthermore, the first magnet receiving portion 122b and the second magnet receiving portion 122c can be paired and alternately arranged on the outer side of the rotor core 122a, showing two pairs of continuously arranged portions.

[0224] Taking the portion with the rotating shaft 125 at the center of the rotor core 122a as a reference, a first magnet receiving portion 122b is arranged on the left side, and a second magnet receiving portion 122c is arranged on the right side. The first magnet receiving portion 122b and the second magnet receiving portion 122c are connected so that they can cross each other.

[0225] Arc portions 123a and 124a are formed at the middle position between the upper right and left sides of the first permanent magnets 123 and 124 housed in the first magnet housing 122b, and arc portions 123a and 124a are formed at the middle position between the upper right and left sides of the second permanent magnets 123 and 124 housed in the second magnet housing 122c.

[0226] As described above, in case 5, the first permanent magnets 123 and 124 have arcuate portions 123a and 124a in the upper ends between the side of the first permanent magnets 123 and 124 and the opposite side thereof. The second permanent magnets 123 and 124 also have arcuate portions 123a and 124a in the upper ends between the side of the first permanent magnets 123 and 124 and the opposite side thereof.

[0227] This not only reduces cogging torque but also minimizes the decrease in motor efficiency.

[0228] In case 6, the portion of the upper end of the first permanent magnets 123 and 124 between the side of the second permanent magnets 123 and 124 and the opposite side thereof has an arc 123a and 124a.

[0229] The second permanent magnets 123 and 124 have arcuate portions 123a and 124a on the upper end opposite to the side near the first permanent magnets 123 and 124.

[0230] Figure 11 This is a top view showing the configuration of the first and second permanent magnets in scenario 6.

[0231] exist Figure 11 In the rotor core 122a, the first magnet receiving portion 122b and the second magnet receiving portion 122c are formed to cross each other on one side. Furthermore, the first magnet receiving portion 122b and the second magnet receiving portion 122c can be paired and alternately arranged on the outer side of the rotor core 122a, showing two pairs of continuously arranged portions.

[0232] Taking the portion with the rotating shaft 125 at the center of the rotor core 122a as a reference, a first magnet receiving portion 122b is arranged on the left side, and a second magnet receiving portion 122c is arranged on the right side. The first magnet receiving portion 122b and the second magnet receiving portion 122c are connected so that they can cross each other.

[0233] Arc portions 123a and 124a are formed at the middle position between the upper right and left sides of the first permanent magnets 123 and 124 housed in the first magnet housing 122b, and arc portions 123a and 124a are formed at the upper right side of the second permanent magnets 123 and 124 housed in the second magnet housing 122c.

[0234] As described above, in case 6, the first permanent magnets 123 and 124 have arcuate portions 123a and 124a in the upper part between the side of the first permanent magnet 123 and 124 that is close to the second permanent magnet 123 and 124 and the opposite side thereto.

[0235] The second permanent magnets 123 and 124 have arcuate portions 123a and 124a on the upper end opposite to the side near the first permanent magnets 123 and 124.

[0236] This not only reduces cogging torque but also minimizes the decrease in motor efficiency.

[0237] Figure 16 It shows the curves of cogging torque and motor efficiency for each case.

[0238] ReferenceFigure 16 This allows us to determine the extent of the decrease in cogging torque and motor efficiency under various circumstances.

[0239] In scenarios 4 to 6, the cogging torque decreased by approximately 60%, and the motor efficiency decreased by approximately 0.5%.

[0240] In terms of reducing cogging torque, the permanent magnet configurations 123 and 124 in cases 4 to 6 are more advantageous than those in cases 1 to 3 (there is a difference of about 70% in reducing cogging torque).

[0241] In terms of minimizing the decrease in motor efficiency, the permanent magnet configurations 123 and 124 in scenarios 4 to 6 are more advantageous than those in scenarios 7 to 9 (with a difference of approximately 0.05% less decrease in motor efficiency).

[0242] From the perspective of reducing cogging torque and minimizing the decrease in motor efficiency, the permanent magnet configurations 123 and 124 in cases 4 to 6 are more advantageous than those in other cases.

[0243] Figure 12 This is a top view showing the configuration of the first and second permanent magnets in scenario 7. Figure 13 This is a top view showing the configuration of the first and second permanent magnets in scenario 8. Figure 14 This is a top view showing the configuration of the first and second permanent magnets in scenario 9.

[0244] Reference Figure 12 to Figure 14 Situations 7 to 9 of the present invention will be described.

[0245] In scenarios 7 to 9, taking the portion where the rotating shaft 125 is located as the center of the rotor core 122a as a reference, a first magnet receiving portion 122b is arranged on the left side and a second magnet receiving portion 122c is arranged on the right side. The first magnet receiving portion 122b and the second magnet receiving portion 122c are connected so that they can cross each other.

[0246] In scenario 7, arc portions 123a and 124a are formed on the upper left side of the first permanent magnets 123 and 124 housed in the first magnet housing 122b, and arc portions 123a and 124a are formed on the upper left side of the second permanent magnets 123 and 124 housed in the second magnet housing 122c.

[0247] In scenario 8, arc portions 123a and 124a are formed on the upper left side of the first permanent magnets 123 and 124 housed in the first magnet housing 122b, and arc portions 123a and 124a are formed in the middle portion between the upper left and right sides of the second permanent magnets 123 and 124 housed in the second magnet housing 122c.

[0248] In scenario 9, arc portions 123a and 124a are formed on the upper left side of the first permanent magnets 123 and 124 housed in the first magnet housing 122b, and arc portions 123a and 124a are formed on the upper right side of the second permanent magnets 123 and 124 housed in the second magnet housing 122c.

[0249] The magnet insertion motor and rotary compressor having the above-described magnetic insertion motor are not limited to the configuration and method of the described embodiments. All or part of the various embodiments can be selectively combined to achieve various modified embodiments.

[0250] It will be self-evident to those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit and essential features of the invention. Therefore, all aspects of the detailed description of the invention should not be construed as limiting, but rather as exemplary. The scope of the invention should be determined by a reasonable interpretation of the appended claims, and all modifications within the equivalent scope of the invention should fall within the scope of the invention.

[0251] Industrial applicability

[0252] This invention can be applied to magnet insertion motors that reduce noise and vibration, as well as rotary compressors incorporating them.

Claims

1. A magnet insert motor, wherein, Comprise: a stator core; a rotor core disposed inside the stator core, disposed to be rotatable; a permanent magnet housed inside the rotor core; and a rotating shaft disposed inside the rotor core and rotating together with the rotor core; the rotating shaft comprises an upper side portion combined with the rotor core and a lower side portion combined with a load receiving a rotating force of the rotor core; a plurality of magnet housing portions are disposed inside the rotor core in a circumferential direction; the permanent magnet is inserted into the magnet housing portion; the permanent magnet comprises, with reference to a polarity acting surface, an upper end directed toward an end portion of the upper side portion of the rotating shaft, a lower end directed toward an end portion of the lower side portion of the rotating shaft opposite to the upper end, and two side ends connecting the upper end and the lower end; the upper end comprises an arc portion formed with an arc, and the lower end and the two side ends are formed in a straight line shape.

2. The magnet-insertion type motor according to claim 1, wherein the plurality of magnet housing portions are each composed of a pair of magnet housing portions inserted in a V shape spaced apart from each other as approaching a radially outer side; the pair of magnet housing portions have a first magnet housing portion and a second magnet housing portion; the permanent magnet comprises a first permanent magnet inserted into the first magnet housing portion and a second permanent magnet inserted into the second magnet housing portion.

3. The magnet-insertion type motor according to claim 1, wherein the lower side portion of the rotating shaft comprises a crankshaft eccentrically rotating.

4. The magnet-insertion type motor according to claim 2, wherein the first permanent magnet and the second permanent magnet each have an arc portion in a side of each upper end close to each other.

5. The magnet-insertion type motor according to claim 2, wherein the first permanent magnet has an arc portion in a side of an upper end close to the second permanent magnet; the second permanent magnet has an arc portion in a portion of an upper end between a side close to the first permanent magnet and another side opposite thereto.

6. The magnet-insertion type motor according to claim 2, wherein the first permanent magnet has an arc portion in a side of an upper end close to the second permanent magnet; the second permanent magnet has an arc portion in another side of an upper end opposite to the side close to the first permanent magnet.

7. The magnet-insertion type motor according to claim 2, wherein the first permanent magnet has an arc portion in a portion of an upper end between a side close to the second permanent magnet and another side opposite thereto; the second permanent magnet has an arc portion in a side of an upper end close to the first permanent magnet.

8. The magnet-insertion type motor according to claim 2, wherein the first permanent magnet has an arc portion in a portion of an upper end between a side close to the second permanent magnet and another side opposite thereto; the second permanent magnet has an arc portion in a portion of an upper end between a side close to the first permanent magnet and another side opposite thereto.

9. The magnet-insertion type motor according to claim 2, wherein the first permanent magnet has an arc portion in a portion of an upper end between a side close to the second permanent magnet and another side opposite thereto; the second permanent magnet has an arc portion in another side of an upper end opposite to the side close to the first permanent magnet.

10. The magnet-inserted motor according to claim 2, wherein the first magnet housing portion and the second magnet housing portion are alternately arranged in a circumferential direction on an outer side of the rotor core.

11. The magnet-inserted motor according to claim 2, wherein one side and the other side of the arc portion of the first permanent magnet and the second permanent magnet are respectively provided with a curvature portion.

12. The magnet-inserted motor according to claim 2, wherein a corner-removal region is provided between the two sides of the arc portion, the first magnet housing portion and the second magnet housing portion, and the side walls of the first magnet housing portion and the second magnet housing portion.

13. The magnet-inserted motor according to claim 12, wherein the stator core is provided with a tooth extending in a radial direction so as to form an air gap with an outer periphery of the rotor core; the corner-removal region overlaps the tooth in a circumferential direction.

14. The magnet-inserted motor according to claim 12, wherein a protruding bridge portion is provided which protrudes from a face between the first magnet housing portion and the second magnet housing portion to define one side of the corner-removal region between the first magnet housing portion and the second magnet housing portion.

15. The magnet-inserted motor according to claim 14, wherein the protruding bridge portion has a predetermined width and extends in an axial direction to support side faces of the first permanent magnet and the second permanent magnet.

16. The magnet-inserted motor according to claim 4, wherein a curvature of one side of the arc portion of the first permanent magnet and the second permanent magnet, which is close to the other, is smaller than a curvature of the other side of the arc portion, which is opposite thereto.

17. The magnet-inserted motor according to claim 5, wherein a curvature of one side of the arc portion of the first permanent magnet, which is close to the second permanent magnet, is smaller than a curvature of the other side, which is opposite thereto; curvatures of one side of the arc portion of the second permanent magnet, which is close to the first permanent magnet, and the other side, which is opposite thereto, are the same as each other.

18. The magnet-inserted motor according to claim 6, wherein a curvature of one side of the arc portion of the first permanent magnet, which is close to the second permanent magnet, is smaller than a curvature of the other side, which is opposite thereto; a curvature of one side of the arc portion of the second permanent magnet, which is close to the first permanent magnet, is greater than a curvature of the other side, which is opposite thereto.

19. The magnet-inserted motor according to claim 7, wherein curvatures of one side of the arc portion of the first permanent magnet, which is close to the second permanent magnet, and the other side, which is opposite thereto, are the same as each other; a curvature of one side of the arc portion of the second permanent magnet, which is close to the first permanent magnet, is smaller than a curvature of the other side, which is opposite thereto.

20. A rotary compressor, comprising: including: a housing forming an appearance; a cylinder provided inside the housing, having a compression space on an inner peripheral surface of the cylinder, the cylinder being provided with a suction port communicating with the compression space so as to be able to suck in refrigerant; a roller rotatably provided in the compression space of the cylinder; and the magnet-inserted motor according to any one of claims 1 to 19. ​

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