Motor rotor and permanent magnet brushless motor with same

Abstract

The motor rotor comprises a rotor iron core and magnetic steel, the rotor iron core comprises a first rotor punching sheet and a second rotor punching sheet, the outside of the first rotor punching sheet is provided with a protruding portion, the outside of the second rotor punching sheet is provided with a groove portion, and the protruding portion and the groove portion are arranged in a staggered mode. The magnetic steel is fixed between the protruding parts of the first rotor punching sheet and is fixed between the groove parts of the second rotor punching sheet at the same time. And the first rotor punching sheet is arranged at the front part, the rear part or the front and rear parts of the second rotor punching sheet. Compared with the prior art, the utility model has the advantages that the magnetic flux leakage of the motor is reduced as much as possible under the condition that the output of the motor is not changed, and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of motor, especially a kind of motor rotor and permanent magnet brushless motor with rotor. BACKGROUND

[0002] Traditional permanent magnet brushless motor rotor structure is divided into pasting magnetic steel on the surface of rotor core and magnetic steel insertion inside rotor core, when magnetic steel is placed on the surface of rotor core, in order to prevent magnetic steel from being thrown out when rotor rotates, the fixation of magnetic steel is particularly important, generally is the way of fixed in the outside of magnetic steel by clavus or steel sleeve.

[0003] In addition, when magnetic steel is pasted on the outside of rotor, the positioning between magnetic steel and magnetic steel is also very important, inaccurate positioning can affect the cogging torque of motor, and then bring the abnormality of torque fluctuation and the increase of vibration noise in running process.

[0004] As shown in Figure 1 The permanent magnet brushless motor rotor structure of existing scheme one includes first existing rotor core 1 and magnetic steel 2, there is protruding part 3 outside rotor core, magnetic steel 2 is fixed between protruding part 3 outside first existing rotor core 1, so that the positioning of magnetic steel on the outside of rotor is solved, but the problem is that protruding part outside rotor core can bring the magnetic leakage of magnetic steel, and the torque of motor is reduced; at the same time, magnetic steel needs to be fixed on the outside of rotor by glue.

[0005] Existing scheme one can reduce the torque of motor, and the bonding of magnetic steel can increase working hours.

[0006] In order to reduce the magnetic leakage of magnetic steel caused by setting positioning protruding part, while keeping magnetic steel can be positioned, and removing the use of magnetic steel glue, scheme two is adopted, as shown in Figure 2, the original magnetic steel protruding part is hollowed into dovetail groove part 5, which prevents the magnetic leakage of magnetic steel and improves the torque of motor. At the same time, plastic part 6 (or other non-magnetic material) is placed in dovetail groove part 5, plastic part 6 is the component of first and last dovetail; small dovetail part cooperates with dovetail groove part 5 of second existing rotor core 4, and larger outside dovetail is used to fix magnetic steel. The combination of plastic part 6 and second existing rotor core 4 can be that plastic part 6 is inserted into second existing rotor core 4 as a separate component, and then magnetic steel is inserted; or second existing rotor core 4 is an insert, and a one-piece of second existing rotor core 4 and plastic part 6 is obtained by injection molding, and then magnetic steel is inserted.

[0007] Existing scheme two can increase the manufacturing process of motor by injection molding or inserting plastic part, and the cost of motor is increased. UTILITY MODEL CONTENTS

[0008] The utility model discloses a motor rotor and permanent magnet brushless motor with rotor which overcome the defects of the prior art.

[0009] The utility model discloses a motor rotor and permanent magnet brushless motor with rotor which overcome the defects of the prior art.

[0010] According to one aspect of the utility model, a motor rotor is provided, which comprises a rotor core and a magnetic steel, the rotor core comprises a first rotor lamination and a second rotor lamination, the first rotor lamination is externally provided with a protruding portion, the second rotor lamination is externally provided with a groove portion, the magnetic steel is fixed between the protruding portions of the first rotor lamination and simultaneously fixed between the groove portions of the second rotor lamination, and the first rotor lamination is arranged at the front portion, rear portion or front and rear portions of the second rotor lamination.

[0011] As a preferred technical scheme, the first rotor lamination is provided with at least one piece.

[0012] As a preferred technical scheme, the first rotor lamination is made of a non-magnetic material, and the non-magnetic material is preferably stainless steel.

[0013] As a preferred technical scheme, when the first rotor lamination is made of stainless steel, the first rotor lamination is positioned and fixed on the rotating shaft of the motor by means of segmented pressing.

[0014] As a preferred technical scheme, the first rotor lamination and the second rotor lamination are provided with positioning built-in holes.

[0015] As a preferred technical scheme, the magnetic steel is fixed by glue.

[0016] As a preferred technical scheme, the first rotor lamination is externally provided with a dovetail portion for fixing the magnetic steel.

[0017] As a preferred technical scheme, the dovetail portion comprises a first dovetail portion for matching the circular arc portion of the magnetic steel and a second dovetail portion for matching the linear portions on the two sides of the magnetic steel.

[0018] As a preferred technical scheme, the maximum outer diameter R1 of the magnetic steel after being mounted to the rotor core is greater than or equal to the outer circle radius R2 of the dovetail portion.

[0019] According to another aspect of the utility model, a permanent magnet brushless motor with a rotor is provided, which comprises a motor stator and the motor rotor.

[0020] Compared with the prior art, the utility model has the following advantages:

[0021] 1) The rotor structure of the utility model can reduce the magnetic leakage of the motor as much as possible under the condition that the output of the motor remains unchanged, and meanwhile, the convenience of the rotor process is ensured, and the manufacturing cost of the motor is reduced.

[0022] 2) The utility model sets up the first rotor lamination and solves the axial positioning problem of the magnetic steel, the second rotor lamination solves the magnetic leakage problem of the magnetic steel, when the material of the first rotor lamination is non-magnetic stainless steel, the magnetic leakage of the magnetic steel does not exist completely;

[0023] 3) The utility model realizes positioning and fixing on the rotating shaft of the motor by the way of segmented pressing, and further improves the motor performance. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is structural schematic view of prior scheme one;

[0025] Fig. 2 (a) is structural schematic view of prior scheme two;

[0026] Fig. 2 (b) is structural schematic view after adding plastic part of prior scheme two;

[0027] Fig. 2 (c) is three-dimensional structural schematic view after assembling of prior scheme two;

[0028] Figure 3 It is structural schematic view of the first rotor lamination of embodiment 1;

[0029] Figure 4 It is structural schematic view of the second rotor lamination of embodiment 1;

[0030] Figure 5 It is three-dimensional structural schematic view after assembling of embodiment 1;

[0031] Figure 6 It is structural schematic view of the first rotor lamination of embodiment 2;

[0032] Figure 7 It is three-dimensional structural schematic view after assembling of embodiment 2;

[0033] Figure 8 It is main view structural schematic view after assembling of embodiment 2;

[0034] Wherein 1 is the first existing rotor core, 2 is the magnetic steel, 3 is the protruding part, 4 is the second existing rotor core, 5 is the dovetail groove part, 6 is the plastic part, 11 is the first rotor lamination, 12 is the second rotor lamination, 23 is the first dovetail part, 24 is the second dovetail part. DETAILED DESCRIPTION

[0035] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described, obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the protection scope of the present application.

[0036] Embodiment 1

[0037] As shown in Figure 3 and Figure 4 , a motor rotor comprises a rotor core and a magnetic steel 2, the rotor core comprises a first rotor lamination 11 and a second rotor lamination 12, the first rotor lamination 11 is externally provided with a protruding part, the second rotor lamination 12 is externally provided with a groove part, the magnetic steel 2 is fixed between the protruding parts of the first rotor lamination 11 and simultaneously fixed between the groove parts of the second rotor lamination 12; the first rotor lamination 11 is arranged at the front part, the rear part or the front and rear parts of the second rotor lamination 12.

[0038] In this scheme, the magnetic steel still needs to be fixed to the outside of the rotor by glue.

[0039] As shown in Figure 5 , the present embodiment is provided with two shapes of rotor laminations, wherein the first rotor lamination 11 and the rotor lamination of the existing scheme are completely the same in shape; but the material of the first rotor lamination 11 can be stainless steel, and the arrangement of the first rotor lamination 11 solves the problem of axial positioning of the magnetic steel; the second rotor lamination 4 solves the problem of magnetic leakage of the magnetic steel, and when the material of the first rotor lamination 11 adopts the material of the second rotor lamination 4, a small amount of magnetic leakage of the magnetic steel exists at the front and rear parts of the rotor core and the first rotor lamination 11. When the material of the second rotor lamination 11 is non-magnetic stainless steel, the magnetic leakage of the magnetic steel does not exist at all.

[0040] When the rotor laminations at the front and rear ends of the rotor core adopt non-magnetic stainless steel, positioning and fixing can be realized on the rotating shaft of the motor by means of segmented pressing.

[0041] The specific method is to first position through the built-in hole on the rotor lamination (insert a core rod into the built-in hole), fix the positions of the front and rear rotor cores and the middle rotor core in the circumferential direction in sequence, then press the rotating shaft of the motor into the front rotor core, the middle rotor core and the rear rotor core in sequence, the core rod ensures that the three rotor cores are positioned in order in the circumferential direction, and the motor rotor ensures that the three rotor cores are combined closely in the axial direction.

[0042] Embodiment 2

[0043] As shown in Figure 6 and 7As shown in the figure, a motor rotor comprises a rotor core and a magnetic steel 2, the rotor core comprises a first rotor lamination 11 and a second rotor lamination 12, the first rotor lamination 11 is externally provided with a protruding part, the second rotor lamination 12 is externally provided with a groove part, the magnetic steel 2 is fixed between the protruding parts of the first rotor lamination 11 and between the groove parts of the second rotor lamination 12; the first rotor lamination 11 is arranged at the front part, the rear part or the front and rear parts of the second rotor lamination 12.

[0044] The first rotor lamination 11 is externally provided with a dovetail for fixing the magnetic steel, a first dovetail part 23 and a second dovetail part 24 are respectively matched with the arc part and the linear parts on both sides of the magnetic steel; R2 is the outer radius of the dovetail part of the first rotor lamination 11, R1 is the maximum outer diameter of the magnetic steel after being fixed to the rotor core, R1≥R2, as shown in the figure. Figure 8

[0045] In this scheme, the magnetic steel does not need to be fixed to the outside of the rotor by glue.

[0046] The first rotor lamination 11 is arranged to solve the axial positioning problem of the magnetic steel, the second rotor lamination 4 is arranged to solve the magnetic leakage problem of the magnetic steel, the material of the first rotor lamination 11 is non-magnetic stainless steel, at this time, the magnetic leakage of the magnetic steel does not exist at all.

[0047] When the rotor laminations at the front and rear ends of the rotor core are made of non-magnetic stainless steel, the positioning and fixing can be realized on the rotating shaft of the motor by means of segmented pressing.

[0048] The specific method is to first position through the built-in hole on the rotor lamination (insert the core rod into the built-in hole), fix the positions of the front and rear rotor cores and the middle rotor core in the circumferential direction in sequence, then press the rotating shaft of the motor into the front rotor core, the middle rotor core and the rear rotor core in sequence, the core rod ensures that the three rotor cores are positioned in order in the circumferential direction, and the motor rotor ensures that the three rotor cores are combined closely in the axial direction.

[0049] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any skilled person in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, and these modifications or replacements shall be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.​

Claims

1. An electric machine rotor comprising a rotor core and a magnetic steel (2), characterized in that, The rotor core comprises a first rotor lamination (11) and a second rotor lamination (12), the first rotor lamination (11) is externally provided with a protruding part, the second rotor lamination (12) is externally provided with a groove part, the magnetic steel (2) is fixed between the protruding parts of the first rotor lamination (11) and between the groove parts of the second rotor lamination (12); the first rotor lamination (11) is arranged at the front part, rear part or front and rear parts of the second rotor lamination (12).

2. An electric machine rotor according to claim 1, characterized in that The first rotor lamination (11) is provided with at least one piece.

3. The electric motor rotor of claim 1, wherein, The first rotor lamination (11) is made of a non-magnetic material, preferably stainless steel.

4. An electric machine rotor according to claim 3, characterized in that When the first rotor lamination (11) is made of stainless steel, the positioning and fixing are realized on the rotating shaft of the motor by means of segmented pressing.

5. An electric machine rotor according to claim 4, characterized in that The first rotor lamination (11) and the second rotor lamination (12) are provided with positioning built-in holes.

6. The electric motor rotor of claim 1, wherein, The magnetic steel (2) is fixed by glue.

7. The electric motor rotor of claim 1, wherein, The first rotor lamination (11) is externally provided with a dovetail part for fixing the magnetic steel (2).

8. An electric machine rotor according to claim 7, characterized in that The dovetail part comprises a first dovetail part (23) for matching the arc part of the magnetic steel (2) and a second dovetail part (24) for matching the linear parts on both sides of the magnetic steel (2).

9. The electric motor rotor of claim 7, wherein, The maximum outer diameter R1 of the magnetic steel (2) after being installed on the rotor core is greater than or equal to the outer circle radius R2 of the dovetail part.

10. A permanent magnet brushless motor having a rotor, characterized by The motor comprises a motor stator and a motor rotor as claimed in any one of claims 1-9.

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