Motor rotor and motor

Abstract

The utility model belongs to the technical field of motors, and discloses a motor rotor and a motor. The motor rotor comprises a rotor iron core, a plurality of magnetic grooves are uniformly arranged on the rotor iron core around the axis of the rotor iron core, two ends of each magnetic groove extend from the middle section of the magnetic groove to the periphery of the rotor iron core, two ends of each magnetic groove are provided with magnetic isolation grooves, and each magnetic isolation groove comprises a first groove part and a second groove part which are communicated in sequence. The extension direction of the first groove portion intersects with the extension direction of the magnetic groove, the extension direction of the first groove portion intersects with the extension direction of the second groove portion, and a magnetic isolation area is formed between the magnetic isolation groove and the end portion of the magnetic groove on the plane, perpendicular to the axial direction of the rotor iron core, of the rotor iron core. According to the motor rotor provided by the utility model, the magnetic isolation grooves extend along the folding lines, and the magnetic isolation path is prolonged in a limited space, so that the area of a magnetic isolation region is increased, the problem of inter-pole magnetic leakage of the rotor is effectively relieved, the force lines of a magnetic field in the motor can be increased or enhanced, and the efficiency of the motor is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technology field especially relates to a motor rotor and motor. BACKGROUND

[0002] Motor rotor is the rotating part in motor, and the rotor can be made into solid form, or can be pressed from laminations, and permanent magnet material is mounted thereon. The motor of the commonly used variable frequency compressor generally uses built-in permanent magnet motor, that is, a magnetic slot is formed on the rotor along the axial direction, and a plurality of magnetic slots are formed along the circumferential direction of the rotor, and the magnetic stone is arranged in the interior of the magnetic slot.

[0003] At present, in order to prevent the end of the magnetic stone from generating magnetic flux leakage, a magnetic separation hole is reserved at the end of the magnetic slot close to the outer periphery of the rotor, and the effective magnetic separation area of the magnetic separation hole is the cross-sectional area of the magnetic separation hole perpendicular to the axis of the rotor, but the current magnetic separation hole generally extends from the end of the magnetic slot to the outer periphery of the rotor, and the space between the end of the magnetic slot and the outer periphery of the rotor is limited, which results in that the magnetic separation area of the magnetic separation hole is small, thereby limiting the magnetic separation effect of the magnetic separation hole, and a certain degree of magnetic flux leakage phenomenon occurs between the poles of the rotor, which results in that the magnetic field force lines in the motor are less or weaker, and further results in that the electromagnetic torque and the rotating speed of the motor are reduced, which greatly affects the efficiency of the motor. In addition, the outer periphery of the conventional motor rotor is a whole circle, which results in that the motor has high induction voltage harmonic distortion rate, large vibration amplitude and large noise. SUMMARY

[0004] The utility model aims at providing a motor rotor and motor to increase the magnetic separation area, reduce the magnetic flux leakage, so that the magnetic field force lines in the motor are more or stronger, thereby greatly improving the efficiency of the motor.

[0005] To achieve this purpose, the utility model adopts the following technical scheme:

[0006] The motor rotor comprises a rotor core, a plurality of magnetic slots are uniformly arranged on the rotor core along the axis thereof, the magnetic slots are used for accommodating magnetic members, and the two ends of each magnetic slot extend from the middle section of the magnetic slot to the outer periphery of the rotor core, so that the middle section of the magnetic slot forms an angle part pointing to the axis of the rotor core.

[0007] The two ends of each magnetic slot are provided with a magnetic separation slot, the magnetic separation slot comprises a first slot part and a second slot part which are sequentially communicated, the first slot part extends from the end of the magnetic slot to the middle section of the magnetic slot, the extension direction of the first slot part and the extension direction of the magnetic slot are crossed, the second slot part extends from the end of the first slot part to the middle section of the magnetic slot, and the extension direction of the first slot part and the extension direction of the second slot part are crossed, so as to form a magnetic separation area between the magnetic separation slot and the end of the magnetic slot on the plane of the rotor core perpendicular to the axial direction of the rotor core.

[0008] Preferably, the extending direction of the first slot portion is perpendicular to the extending direction of the second slot portion.

[0009] Preferably, the magnetic slot is arranged in a V shape, and the included angle of the V shape is β, 95°≤β≤145°.

[0010] Preferably, along the axial direction perpendicular to the rotor core, the outer contour of the rotor core is connected by a plurality of alternately arranged main arc segments and auxiliary arc segments, and the curvatures of the main arc segments and the auxiliary arc segments are different.

[0011] Preferably, the length of the rotor core along the axial direction of the rotor core is Lr, and the maximum outer diameter of the rotor core is Dor, 1.141≤Lr / Dor≤1.57.

[0012] Preferably, the rotor core comprises a plurality of rotor laminations stacked along the axial direction of the rotor core, and the thickness of the rotor laminations is hr, hr≤0.35mm.

[0013] The motor comprises a housing and a stator arranged inside the housing, and further comprises a motor rotor rotatably arranged in the inner ring of the stator.

[0014] Preferably, the rotor core further comprises a magnetic member arranged inside the magnetic slot, and the dimension of the magnetic member along the radial direction of the rotor core is hm, 1.1×≤hm≤5×, wherein Ris is the radius of the inner ring of the stator, and Ror is the maximum radius of the rotor core.

[0015] Preferably, the stator comprises a stator core, and the length of the stator core along the axial direction thereof is Ls, 90mm≤Ls≤140mm.

[0016] Preferably, the stator comprises a stator core, and the length of the stator core along the axial direction thereof is Ls, 1.301≤Ls / Dor≤1.46.

[0017] The motor rotor has the following beneficial effects:

[0018] The motor rotor has the following beneficial effects: BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a sectional view of the stator and motor rotor of the utility model along the radial direction of the rotor shaft;

[0020] Figure 2 is a structural schematic view of the motor rotor of the utility model along the axial direction perpendicular to the rotor shaft;

[0021] Figure 3 is Figure 2 is an enlarged view of A in the figure;

[0022] Figure 4 is a structural schematic view of the rotor core of the utility model.

[0023] in the figure:

[0024] 1, rotor core; 11, rotor lamination; 2, rotor shaft; 3, magnetic slot; 4, magnetic isolation slot; 41, first slot part; 42, second slot part; 43, magnetic isolation area; 51, main arc segment; 52, auxiliary arc segment; 53, reference circle; 6, stator core. DETAILED DESCRIPTION

[0025] The utility model will be further described in detail below in combination with the drawings and examples. It can be understood that the specific examples described herein are only used to explain the utility model and are not limited to the utility model. In addition, it should be noted that, in order to facilitate the description, only the part related to the utility model is shown in the drawings, not all the structures.

[0026] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, 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; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0027] In the utility model, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature in the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature in the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature in the second feature include that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0028] In the description of the present embodiment, the terms "upper", "lower", "right", "left", and the like, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used to distinguish in the description, and have no special meaning.

[0029] Reference will now be made to Figures 1 to 4 The motor rotor and the motor provided by the present application are described.

[0030] Reference is made to Figure 1 The motor includes a housing (not shown in the figure), a stator, and a motor rotor, the stator is fixedly connected to the inner wall of the housing, the motor rotor is coaxially arranged in the inner ring of the stator, and the motor rotor is rotationally connected to the housing. Among them, the stator includes a stator core 6 and a stator winding.

[0031] In addition, the length of the stator core 6 along its axial direction is Ls, 90mm≤Ls≤140mm, in this embodiment, the length of the stator core 6 along its axial direction is set to 90mm to 140mm, which can take into account the noise reduction performance and efficiency of the motor.

[0032] Reference is made to Figure 1 And Figure 2 The motor rotor includes a rotor core 1, a rotor shaft 2, and a magnetic member (not shown in the figure), the rotor shaft 2 is coaxially fixed through the rotor core 1, and the magnetic member is arranged inside the rotor core 1. Specifically, a plurality of magnetic grooves 3 are uniformly arranged on the rotor core 1 around the rotor shaft 2, each magnetic groove 3 has a magnetic member arranged inside, and both ends of each magnetic groove 3 extend from the middle section of the magnetic groove 3 to the outer periphery of the rotor core 1, so that the middle section of the magnetic groove 3 forms a corner part pointing to the axis of the rotor core 1.

[0033] Reference is made to Figure 3 Further, each magnetic groove 3 is provided with a magnetic separation groove 4 at both ends, each magnetic separation groove 4 includes a first groove part 41 and a second groove part 42 which are sequentially communicated, the first groove part 41 extends from the end of the magnetic groove 3 to the middle section of the magnetic groove 3, the second groove part 42 extends from the end of the first groove part 41 to the middle section of the magnetic groove 3, and the extension direction of the first groove part 41 and the extension direction of the second groove part 42 are crossed, so that the rotor core 1 forms a magnetic separation area 43 in the plane perpendicular to its axial direction.

[0034] By the above arrangement, the first slot portion 41 and the second slot portion 42 are sequentially arranged at the end of the magnetic slot 3, and the first slot portion 41 is different from the extension direction of the magnetic slot 3, and the extension directions of the first slot portion 41 and the second slot portion 42 are different, that is, the magnetic isolation slot 4 extends along the fold line, and the path of the magnetic isolation slot 4 is lengthened in a limited space through two changes of direction, so that the magnetic isolation slot 4 is approximately in the shape of a sickle; also, the strip-shaped magnetic isolation slot 4 is surrounded to form a magnetic isolation area 43 in a plane perpendicular to the axial direction of the rotor core 1, and the area of the magnetic isolation area 43 not only includes the cross-sectional area of the magnetic slot 3 itself in the axial direction of the rotor core 1, but also includes the cross-sectional area of the solid part between the second slot portion 42 and the magnetic slot 3, thereby greatly increasing the effective magnetic isolation area, effectively relieving the problem of magnetic leakage between rotor poles, and allowing the internal magnetic field lines of the motor to be more or stronger, thereby improving the efficiency of the motor.

[0035] As a preferred, the extension direction of the first slot portion 41 and the extension direction of the second slot portion 42 are perpendicular, thereby forming a magnetic isolation area 43 approximately close to a rectangle at the end of each magnetic slot 3, which helps to improve the effect of magnetic isolation. Among them, the cross section of the first slot portion 41 perpendicular to the axis of the rotor core 1 is approximately wedge-shaped, and the tip of the wedge shape is directed to the second slot portion 42, and the cross section of the second slot portion 42 perpendicular to the axis of the rotor core 1 is approximately trapezoidal, and the side of the second slot portion 42 farthest from the first slot portion 41 is an oblique side, and the included angle between the oblique side and the extension direction of the second slot portion 42 is θ, 110°≤θ≤150°, and θ of the embodiment is preferably 135°.

[0036] Further, on the side where the two adjacent magnetic slots 3 are close to each other, the minimum distance between the two adjacent magnetic isolation slots 4 here is b, 1mm≤b≤6mm, and the maximum distance is a, 19mm≤a≤23mm. Among them, b is at least 1mm, so as to ensure that there is at least a gap of 1mm between the two magnetic slots 3, facilitate processing, and can ensure the magnetic flux and structural strength here, and at the same time, b is at most 6mm, thereby limiting the distance between the two adjacent magnetic isolation slots 4, which helps to improve the utilization rate of the rotor core 1. In addition, a is at least 19mm, which helps to ensure the size of the magnetic isolation slot 4, thereby ensuring the efficiency of the magnetic isolation, and a is at most 23mm, which limits the maximum size of the magnetic isolation slot 4 to prevent the magnetic isolation slot 4 from interfering with the conduction of the normal magnetic circuit of the motor. In the embodiment, b is preferably 5mm, and a is preferably 20mm, and in other embodiments, b and a can also be other values.

[0037] Exemplarily, the number of the magnetic slots 3 is N, 4≤N≤10, and the number of the magnetic slots 3 in the embodiment is preferably 6. In other embodiments, the number of the magnetic slots 3 can also be 4, 8 or 10, and the number can be selected according to actual needs. Each of the magnetic slots 3 is arranged in a V shape, and the tip of the V shape faces the axis of the rotor core 1. Two magnetic pieces, for example, magnetic steels in the embodiment, are arranged in each of the magnetic slots 3. The two magnetic pieces in each of the magnetic slots 3 are arranged in a V shape on the rotor core 1. Through this arrangement, the contact area between the magnetic steels and the air gap can be increased, the magnetic flux is more likely to pass through the air gap, the utilization rate of the magnetic flux is improved, the output torque is increased, and the gap between the magnetic slots 3 facilitates air circulation and heat dissipation, reduces the operating temperature of the motor, and improves the reliability and service life of the motor. Optionally, in other optional embodiments, the magnetic slots 3 can also be arranged in a U shape or an arc shape.

[0038] Further, the included angle of the V shape is β, 95°≤β≤145°, and the included angle β in the embodiment is preferably 135°. In this way, the six groups of V-shaped magnetic steels are distributed on the rotor core 1 in the most reasonable layout, which helps to improve the overall performance of the motor.

[0039] Referring to Figure 4 Exemplarily, the rotor core 1 in the embodiment includes a plurality of rotor laminations 11 stacked along the axial direction of the rotor core 1. The thickness of each of the rotor laminations 11 is hr, and hr≤0.35mm. In the embodiment, hr is preferably 0.35mm. By optimizing the thickness of the rotor laminations 11, the thickness of the rotor laminations 11 is appropriately reduced within the range of 0.35mm or less, so as to reasonably control the manufacturing cost of the motor and effectively reduce the eddy current loss and improve the efficiency of the motor under the condition of providing the required torque. Optionally, in other embodiments, the rotor core 1 can also be an integral body.

[0040] Referring to Figure 2Further, the rotor core 1 in the embodiment is designed as a special-shaped circle in a plane perpendicular to the axial direction of the rotor shaft 2, that is, the outer contour of the rotor core 1 is connected by a plurality of alternately arranged main arc segments 51 and auxiliary arc segments 52, and the curvatures of the main arc segments 51 and the auxiliary arc segments 52 are different. Specifically, in the plane perpendicular to the axial direction of the rotor shaft 2, a reference circle 53 is formed with the intersection O of the plane and the axis of the rotor shaft 2 as the center and d1 as the radius; the auxiliary arc segments 52 are located at the connection positions of the corresponding adjacent two magnetic slots 3 on the plane, and the centers of all the auxiliary arc segments 52 are distributed around the axis of the rotor shaft 2; the radius of the auxiliary arc segment 52 is greater than that of the main arc segment 51, that is, the maximum distance between the auxiliary arc segment 52 and the axis of the rotor shaft 2 is less than the radius of the main arc segment 51, so that the two ends of the auxiliary arc segment 52 intersect with the reference circle 53, and the position of the reference circle 53 between the adjacent two auxiliary arc segments 52 is cut to form a plurality of main arc segments 51, and the main arc segments 51 correspond to the opening positions of the magnetic slots 3, so that the main arc segments 51 and the auxiliary arc segments 52 are connected to form a special-shaped circle, and the maximum outer diameter Dor of the special-shaped circle rotor is 2d1.

[0041] Based on the above, by designing the outer periphery of the rotor core 1 as a special-shaped circle, the conventional induction voltage harmonic distortion rate is reduced, the cogging torque is reduced, the vibration amplitude of the motor is reduced, the noise of the motor is reduced, the generation of eddy current is reduced, the efficiency of the motor is improved, the mechanical strength of the rotor is increased, the motor can withstand greater torque and stress, the reliability and service life of the motor are improved, the heat dissipation space between the rotor core 1 and the stator is increased, the heat dissipation effect of the motor is optimized, the heat dissipation efficiency is improved, and the motor can operate stably in a high-temperature environment.

[0042] As preferred, the farthest distance of the magnetic isolation slot 4 from the point O is d2, and 0.93≤d2 / d1≤0.98, so as to limit the distance between the magnetic isolation slot 4 and the outer periphery of the rotor core 1, so as to ensure the magnetic isolation effect of the magnetic isolation slot 4 while considering the strength of the rotor core 1 at the position corresponding to the magnetic isolation slot 4.

[0043] Since the electromagnetic noise is mainly generated by the radial component of the air gap magnetic field acting on the stator core 6, and the deformation amount of the stator core 6 is proportional to the first power of the harmonic force amplitude, as preferred, 1.301≤Ls / Dor≤1.46, the Ls / Dor is controlled between 1.301 and 1.46, the amplitude of the air gap magnetic field and its harmonics can be reduced, the load armature reaction on the stator side can be weakened, and the electromagnetic noise of the motor can be reduced.

[0044] Reference Figure 1Further, the rotor core 1 has a length along its axial direction of Lr, 1.141≤Lr / Dor≤1.57, the Lr / Dor is limited to be between 1.141 and 1.57, the air gap magnetic field fundamental wave and its each harmonic amplitude are reduced, the stator side load armature reaction is weakened, the amplitude of each radial electromagnetic exciting force is effectively reduced, and the motor electromagnetic noise is reduced.

[0045] In addition, the inner ring of the stator core 6 has a radius of Ris, the rotor core 1 has a maximum radius of Ror, the magnetic steel has a dimension along the radial direction of the rotor core 1 of hm, and 1.1×(Ris-Ror)≤hm≤5×(Ris-Ror), so that the dimension of the magnetic steel along the radial direction of the rotor core 1 is limited, a larger energy density is obtained, the battery can output a large torque, the eddy current loss caused by the high frequency harmonic electromagnetic field in the cores of the stator and the rotor is controlled in a proper range, and the motor efficiency is ensured.

[0046] Obviously, the above embodiments of the utility model are only examples for clearly illustrating the utility model, and are not a limitation on the embodiments of the utility model. For ordinary skilled in the art, various obvious changes, re-adjustment and replacement can be made without departing from the protection scope of the utility model. Here, all the embodiments need not and cannot be exhausted. Any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. An electric machine rotor comprising a rotor core (1) on which a plurality of magnetic slots (3) are arranged uniformly about an axis of the rotor core (1), the magnetic slots (3) being intended to accommodate magnetic pieces, characterized in that, Both ends of each of the magnetic grooves (3) extend from the middle section of the magnetic groove (3) to the outer periphery of the rotor core (1), so that the middle section of the magnetic groove (3) forms a corner pointing to the axis of the rotor core (1); Both ends of each of the magnetic grooves (3) are provided with a magnetic separation groove (4), the magnetic separation groove (4) comprises a first groove portion (41) and a second groove portion (42) which are sequentially communicated, the first groove portion (41) extends from the end of the magnetic groove (3) to the middle section of the magnetic groove (3), the extending direction of the first groove portion (41) and the extending direction of the magnetic groove (3) are crossed, the second groove portion (42) extends from the end of the first groove portion (41) to the middle section of the magnetic groove (3), and the extending direction of the first groove portion (41) and the extending direction of the second groove portion (42) are crossed, and a magnetic separation area (43) is formed between the magnetic separation groove (4) and the end of the magnetic groove (3) in the plane perpendicular to the axis of the rotor core (1).

2. The electric machine rotor of claim 1, wherein, The extending direction of the first groove portion (41) is perpendicular to the extending direction of the second groove portion (42).

3. The motor rotor of claim 1, wherein The magnetic groove (3) is arranged in a V shape, and the included angle of the V shape is β, 95°≤β≤145°.

4. The motor rotor of claim 1, wherein, Along the axis perpendicular to the rotor core (1), the outer contour of the rotor core (1) is connected by a plurality of alternately arranged main arc segments (51) and auxiliary arc segments (52), and the curvatures of the main arc segments (51) and the auxiliary arc segments (52) are different.

5. The electric machine rotor of claim 4, wherein, The length of the rotor core (1) along the axis thereof is Lr, and the maximum outer diameter of the rotor core (1) is Dor, 1.141≤Lr / Dor≤1.

57.

6. The motor rotor of claim 1, wherein, The rotor core (1) comprises a plurality of rotor laminations (11) stacked along the axis of the rotor core (1), and the thickness of the rotor lamination (11) is hr, hr≤0.35mm.

7. An electric machine comprising a housing and a stator, said stator being placed inside said housing, characterized in that, The motor further comprises the motor rotor according to claim 4, and the motor rotor is arranged in rotation in the inner ring of the stator.

8. The electric machine of claim 7, wherein, The rotor core (1) further comprises a magnetic member arranged in the magnetic groove (3), and the dimension of the magnetic member along the radial direction of the rotor core (1) is hm, 1.1×(Ris-Ror)≤hm≤5×(Ris-Ror), wherein Ris is the radius of the inner ring of the stator, and Ror is the maximum radius of the rotor core (1).

9. The electric machine of claim 7, wherein, The stator comprises a stator core (6), and the length of the stator core (6) along the axis thereof is Ls, 90mm≤Ls≤140mm.

10. The electric machine of claim 7, wherein, The stator comprises a stator core (6), and the length of the stator core (6) along the axis thereof is Ls, 1.301≤Ls / Dor≤1.46.

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