Rotor of permanent magnet motor

Abstract

The utility model discloses a rotor of a permanent magnet motor, which comprises a rotating shaft and a rotor core, the rotor core comprises a rotor punching sheet, the rotor punching sheet comprises an inner annular area and a plurality of outer fan-shaped areas, the plurality of outer fan-shaped areas are arranged around the inner annular area, and a permanent magnet mounting groove is formed between two adjacent outer fan-shaped areas in the circumferential direction of the rotor core. The permanent magnet mounting grooves are first mounting grooves or second mounting grooves, the first mounting grooves and the second mounting grooves are alternately arranged, the size of the first mounting grooves in the radial direction of the fan-shaped part is larger than that of the second mounting grooves in the radial direction of the fan-shaped part, and the size of the first mounting grooves in the circumferential direction is smaller than that of the second mounting grooves in the circumferential direction. Sintered neodymium-iron-boron magnetic steel is placed in the first mounting groove, and ferrite magnetic steel is placed in the second mounting groove. Therefore, the torque pulsation can be reduced, so that the vibration noise of the motor is reduced; and half of the mounting grooves adopt ferrite to replace the traditional structure of neodymium iron boron magnetic steel, so that the cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to air compressor motor technology field especially relates to a rotor of permanent magnet motor. BACKGROUND

[0002] The motor rotor is the rotating part in the motor, the motor rotor for air compressor currently includes the rotating shaft and the rotor core, the rotor core includes the rotor lamination, the rotor lamination includes the inner annular region and multiple outer sector regions, multiple outer sector regions are arranged around the inner annular region, and the mounting groove for installing permanent magnet is formed between the adjacent two outer sector regions in the circumferential direction of the rotor core, the magnet placed in the magnet placing groove currently all adopts the neodymium iron boron magnetic steel, not only the cost is higher, and the space occupation is big and leads to the rotor torque pulsation to be bigger, can cause the vibration and the noise of motor to be bigger. SUMMARY

[0003] To solve the technical problem in the background art, the utility model provides a rotor of permanent magnet motor.

[0004] The utility model discloses a rotor of permanent magnet motor, including rotating shaft and rotor core, the rotor core includes the rotor lamination, the rotor lamination includes the inner annular region and multiple outer sector regions, multiple the outer sector regions are arranged around the inner annular region, and the permanent magnet mounting groove is formed between the adjacent two outer sector regions in the circumferential direction of the rotor core, the permanent magnet mounting groove is set as first installation groove or second installation groove, the first installation groove and the second installation groove are alternately arranged, the size in the radial direction of sector portion of the first installation groove is greater than the size in the radial direction of sector portion of the second installation groove, the size in the circumferential direction is less than the size in the circumferential direction of the second installation groove, the first installation groove is used for placing sintered neodymium iron boron magnetic steel in, and the second installation groove is used for placing ferrite magnetic steel.

[0005] Preferably, a plurality of reinforcing ribs are provided between the outer sector regions and the inner annular region along the circumferential direction thereof.

[0006] Preferably, the space between the outer sector regions and the inner annular region is filled with a vibration-absorbing injection material.

[0007] Preferably, a plurality of neodymium iron boron magnetic steel bosses are provided on the outer side of the inner annular region along the circumferential direction thereof, and the circumferential width of the neodymium iron boron magnetic steel bosses is greater than twice the circumferential width L3 of the reinforcing ribs, and the height thereof is less than or equal to twice the width thereof.

[0008] Preferably, the circumferential width of the first installation groove is L4, and L3 is greater than or equal to 1 / 3 of L4.

[0009] Preferably, the radial length of the second mounting slot is L1, the bottom of the second mounting slot is L1 away from the radial length of the outer side of the inner annular region, and L2≤1 / 3L1.

[0010] Preferably, the adjacent first mounting slot and second mounting slot are arranged as a pair, and the rotor core includes P / 2 pairs, wherein P is 4, 6, 8, 10 or 12.

[0011] In summary, the utility model has the following beneficial effects: the first mounting slot for placing sintered neodymium iron boron magnetic steel and the second mounting slot for placing ferrite magnetic steel are alternately arranged, which can reduce torque ripple and thus reduce motor vibration noise; the rotor core space saved by the second mounting slot is filled with vibration-absorbing injection material, further reducing motor noise; half of the mounting slots use ferrite to replace the traditional structure of all neodymium iron boron magnetic steel, reducing cost.

[0012] Additional aspects and advantages of the utility model will be partially given in the following description, some will become apparent from the following description, or be understood through the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0013] Fig. 1 is a structure diagram of a rotor core of a permanent magnet motor of an embodiment of the utility model;

[0014] Fig. 2 is a perspective view of a rotor core of a permanent magnet motor of an embodiment of the utility model.

[0015] In the drawings:

[0016] 1, rotor punching; 2, inner annular region; 3, outer fan-shaped region; 4, first mounting slot; 5, second mounting slot; 6, sintered neodymium iron boron magnetic steel; 7, ferrite magnetic steel; 8, reinforcing rib; 9, vibration-absorbing injection material; 10, neodymium iron boron magnetic steel boss; 11, shaft center hole. DETAILED DESCRIPTION

[0017] The embodiments of the utility model are described in detail below, and examples of the embodiments are represented in the drawings, wherein the same or similar symbols represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the utility model and cannot be understood as limiting the utility model.

[0018] As Figs. 1-2As shown, the rotor of the permanent magnet motor provided in the embodiment comprises a rotating shaft and a rotor core, the rotor core comprises rotor laminations 1, the rotor laminations 1 comprise an inner annular region 2 and a plurality of outer fan-shaped regions 3, the plurality of outer fan-shaped regions 3 are arranged around the inner annular region 2, and a permanent magnet mounting groove is formed between two adjacent outer fan-shaped regions 3 in the circumferential direction of the rotor core, the permanent magnet mounting groove is provided as a first mounting groove 4 or a second mounting groove 5, the first mounting groove 4 and the second mounting groove 5 are arranged alternately, and the length and thickness of the first mounting groove 4 and the second mounting groove 5 are different, the size of the first mounting groove 4 in the radial direction of the fan-shaped part is greater than the size of the second mounting groove 5 in the radial direction of the fan-shaped part, and the size of the first mounting groove 4 in the circumferential direction is less than the size of the second mounting groove 5 in the circumferential direction, the first mounting groove 4 is used for placing sintered neodymium iron boron magnetic steel 6, and the second mounting groove 5 is used for placing ferrite magnetic steel 7.

[0019] In the embodiment, the outer side of the inner annular region 2 is provided with a plurality of neodymium iron boron magnetic steel bosses 10 along the circumferential direction thereof, and the circumferential width of the neodymium iron boron magnetic steel boss 10 is greater than twice the circumferential width L3 of the reinforcing rib 8, and the height of the neodymium iron boron magnetic steel boss 10 is less than or equal to twice the width thereof.

[0020] In this way, the first mounting groove 4 for placing the sintered neodymium iron boron magnetic steel 6 and the second mounting groove 5 for placing the ferrite magnetic steel 7 are arranged alternately, which can reduce torque ripple and thus reduce motor vibration noise; half of the mounting grooves use ferrite to replace the traditional structure of all neodymium iron boron magnetic steel, thereby reducing the cost.

[0021] Further, a plurality of reinforcing ribs 8 are arranged between the outer fan-shaped regions 3 and the inner annular region 2 along the circumferential direction thereof. The reinforcing ribs 8 can strengthen the structure strength of the rotor laminations 1 of the rotor core, the permanent magnet mounting groove and the center connection structure of the rotating shaft. Specifically, the circumferential width of the reinforcing rib 8 is set as L3, the circumferential width of the first mounting groove 4 is set as L4, and L3≥1 / 3L4.

[0022] Further, the space between the outer fan-shaped regions 3 and the inner annular region 2 is filled with a vibration-absorbing injection material 9. The vibration and noise caused by the rotation of the rotor are further reduced.

[0023] In the embodiment, in order to ensure the radial fixing strength of the magnetic steel and the rigidity of the tangential rotation of the rotor, the rotor laminations 1 should meet the following conditions: the radial length of the second mounting groove 5 is L1, the radial length from the bottom of the second mounting groove 5 to the outer side of the inner annular region 2 is L1, and L2≤1 / 3L1; and adjacent first mounting grooves 4 and second mounting grooves 5 are arranged as a pair, and the rotor core comprises P / 2 pairs, wherein P is 4, 6, 8, 10 or 12, that is, the rotor core should contain at least 2 pairs of the structure.

[0024] It should be noted that the rotor of the permanent magnet motor in the embodiment can be coated with injection molding material to coat the permanent magnet and the rotor core into an integral piece. It can be a PBT piece, which has the characteristics of light weight, high strength, insulation, corrosion resistance, and also has the advantages of high utilization rate, high molding rate, stable product quality, easy operation, etc., facilitating the molding of injection molded parts and improving the stability of injection molded parts. Of course, in other embodiments, it can also be a BMC piece, which has excellent electrical insulation, heat resistance, flame resistance, high mechanical strength, dimensional stability, shrinkage stability, easy processing, smooth molding surface, and is conducive to improving the performance of the rotor. The specific form of injection molding is not limited here.

[0025] It should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0026] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0027] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication or interaction relationship of two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0028] In the utility model, unless another definite provision and limitation, first feature is on second feature "on" or "under" can be first and second feature direct contact, or first and second feature indirectly contact through intermediate medium. Moreover, first feature is on second feature "on", "above" and "on" can be first feature is on second feature directly or obliquely, or only indicate first feature horizontal height is higher than second feature. First feature is on second feature "under", "below" and "under" can be first feature is on second feature directly or obliquely, or only indicate first feature horizontal height is less than second feature.

[0029] The above merely describes a preferred specific embodiment of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art in the technical range disclosed by the utility model, according to the technical scheme and utility model concept of the utility model, equivalent replacement or change, should be covered in the protection scope of the utility model.

Claims

1. A rotor of a permanent magnet motor, comprising a rotation shaft and a rotor core, the rotor core comprising rotor laminations, the rotor laminations comprising an inner annular region and a plurality of outer sector regions, the plurality of outer sector regions being arranged around the inner annular region, a permanent magnet mounting slot being formed between two adjacent outer sector regions in a circumferential direction of the rotor core, characterized in that, The permanent magnet mounting slot is provided as a first mounting slot or a second mounting slot, the first mounting slot and the second mounting slot are alternately arranged, the size of the first mounting slot in the radial direction of the sector is greater than the size of the second mounting slot in the radial direction of the sector, and the size of the first mounting slot in the circumferential direction is less than the size of the second mounting slot in the circumferential direction, the first mounting slot is used for placing sintered neodymium iron boron magnetic steel, and the second mounting slot is used for placing ferrite magnetic steel.

2. A rotor of a permanent-magnet electric machine according to claim 1, characterized in that A plurality of reinforcing ribs are arranged between the outer sector region and the inner annular region along the circumferential direction thereof.

3. A rotor of a permanent-magnet electric machine according to claim 2, characterized in that The space between the outer sector region and the inner annular region is filled with a vibration-absorbing injection material.

4. A rotor of a permanent-magnet electric machine according to claim 2, characterized in that, The outer side of the inner annular region is provided with a plurality of neodymium iron boron magnetic steel bosses along the circumferential direction thereof, and the circumferential width of the neodymium iron boron magnetic steel boss is greater than twice the circumferential width L3 of the reinforcing rib, and the height of the neodymium iron boron magnetic steel boss is less than or equal to twice the width thereof.

5. The rotor of a permanent-magnet electric machine according to claim 2, characterized in that, The circumferential width of the first mounting slot is L4, and L3 is greater than or equal to 1 / 3 L4.

6. The rotor of a permanent-magnet electric machine according to claim 1, characterized in that, The radial length of the second mounting slot is L1, the radial length of the bottom of the second mounting slot to the outer side of the inner annular region is L1, and L2 is less than or equal to 1 / 3 L1.

7. The rotor of a permanent-magnet electric machine according to claim 1, characterized in that, The first mounting slot and the second mounting slot adjacent to each other are provided as a pair, and the rotor core includes P / 2 pairs, wherein P is 4, 6, 8, 10 or 12.

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