Brushless direct-drive angle grinder rotor and motor

Abstract

The utility model discloses a brushless direct drive angle grinder rotor, comprising a motor shaft, a rotor punching sheet and two axial fixing sleeves, the rotor punching sheet is sleeved on the periphery of the motor shaft, the periphery of the rotor punching sheet is provided with a plurality of magnetic steels which are distributed in an annular array by taking the motor shaft as a center, and the two axial fixing sleeves are fixed on the motor shaft. And the axial fixing sleeve is sleeved on the periphery of the motor shaft, is respectively clamped with the two axial ends of the magnetic steel, and is used for locking the magnetic steel. The utility model further discloses a brushless direct-drive angle grinder motor. According to the motor rotor structure, the exposed magnetic steel design is adopted, a plurality of magnetic steel sheets are directly fixed to form the periphery of the rotor through the rotor punching sheets and the axial fixing sleeve, redundant shells are replaced, the gap between the periphery of the rotor and the inner periphery of the stator can be reduced as much as possible, the rotor and the stator are close to each other as much as possible, and the service life of the rotor is prolonged. Therefore, the torque upper limit of the rotor is effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of electric tools, and relates to a brushless direct drive angle grinder rotor and motor. BACKGROUND

[0002] Handheld angle grinder is a common kind of electric tool, and the angle grinder relies on driving of large torque and high rotating speed to provide excellent working performance, the existing angle grinder products adopt brushless motor to provide driving force, the model selection range of the brushless motor is limited due to the size of the handheld angle grinder, and the existing brushless motor structure is provided with a shell between the rotor and the stator to provide certain structural strength and protection, so that the gap between the rotor and the stator is too large, and thus the small-size brushless motor adapted to the angle grinder is easily affected by the large gap, so that the torque is difficult to improve. SUMMARY

[0003] The utility model discloses in order to overcome the insufficient of prior art, provide a kind of brushless direct drive angle grinder rotor and motor.

[0004] In order to realize the above-mentioned purpose, the utility model adopts the following technical scheme:

[0005] A brushless direct drive angle grinder rotor, comprising a motor shaft, a rotor lamination, and two axial fixing sleeves, the rotor lamination is sleeved on the outer periphery of the motor shaft, the outer periphery of the rotor lamination is provided with a plurality of magnetic steels arranged in a circular array with the motor shaft as the center, the axial fixing sleeve is sleeved on the outer periphery of the motor shaft and is respectively clamped with the axial ends of the magnetic steels, for locking the magnetic steels.

[0006] Further, the number of magnetic steels is six.

[0007] Further, the outer periphery of the rotor lamination is provided with a plurality of clamping ribs arranged in a circular array, and a clamping groove for clamping the magnetic steels is formed between adjacent clamping ribs.

[0008] Further, the outer periphery of the axial fixing sleeve protrudes towards the magnetic steels and is provided with an annular flange, and the flange abuts against the outer periphery of the magnetic steels.

[0009] Further, the outer periphery of the magnetic steels is provided with a first chamfer surface, and the inner periphery of the flange is provided with a second chamfer surface for abutting against the first chamfer surface.

[0010] Further, the shaft end of the motor shaft is provided with a thread for mounting a tool head.

[0011] A brushless direct drive angle grinder motor using the brushless direct drive angle grinder rotor further comprises a stator, the stator is sleeved on the outer periphery of the rotor, and the inner wall of the stator and the outer wall of the magnetic steels form a set gap.

[0012] Further, the stator comprises a plurality of stator laminations distributed along an annular array, and the stator laminations are provided with windings.

[0013] Further, the stator laminations are in the shape of an I-shaped structure, and the stator laminations are respectively provided with clamping strips and clamping grooves on two sides.

[0014] Further, the utility model also comprises a circuit board, which is arranged at one end of the axial direction of the stator, and the circuit board is connected with the windings.

[0015] To sum up, the utility model has the advantages of:

[0016] The motor rotor structure of the utility model adopts exposed magnetic steel design, and a plurality of magnetic steels are directly fixed to form the outer periphery of the rotor through rotor laminations and axial fixing sleeves, the excess shell is replaced, the gap between the outer periphery of the rotor and the inner periphery of the stator can be reduced as much as possible, the rotor and the stator can be as close as possible, and the upper limit of the torque of the rotor is effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a structure schematic view of the rotor of the utility model.

[0018] Figure 2 It is an explosion structure schematic view in Figure 1 .

[0019] Figure 3 It is a cross-sectional structure schematic view of the rotor. Figure 1

[0020] Figure 4 It is a rotor stator combination structure schematic view of the utility model.

[0021] Figure 5 It is a cross-sectional structure schematic view in Figure 4 .

[0022] Figure 6 It is a rotor stator separation structure schematic view in Figure 4 .

[0023] Figure 7 It is a stator lamination structure schematic view of the stator.

[0024] Identified in the drawing: 1, stator;11, stator lamination;12, circuit board;2, rotor;21, motor shaft;22, magnetic steel;23, rotor lamination;24, axial fixing sleeve;241, flange. DETAILED DESCRIPTION

[0025] ​The following embodiments and features in the embodiments can be combined with each other under the condition of no conflict.

[0026] It should be noted that the drawings provided in the following embodiments only schematically illustrate the basic concept of the present application, and only the components related to the present application are shown in the drawings, not the number, shape and size of the components in actual implementation. The shape, number and proportion of each component in actual implementation can be changed arbitrarily, and the component layout pattern can be more complex.

[0027] All directional indications (such as up, down, left, right, front, back, transverse, longitudinal, etc.) in the embodiments of the present application are only used to explain the relative position relationship, movement condition, etc. between components in a certain specific posture, and if the specific posture changes, the directional indications will also change accordingly.

[0028] Due to installation errors and other reasons, the parallel relationship referred to in the embodiments of the present application may actually be an approximate parallel relationship, and the perpendicular relationship may actually be an approximate perpendicular relationship.

[0029] The present application provides a brushless direct-drive angle grinder rotor, referring to Figure 1 The outer periphery of the rotor 2 is exposed and formed with a plurality of magnetic steels 22. The magnetic steels 22 are arranged in a central annular array along the axis of the rotor 2. In this embodiment, the number of magnetic steels 22 is preferably six, so as to form six levels of magnetic steels 22 in the circumferential direction of the rotor 2.

[0030] Referring to Figure 2 The rotor 2 further includes a motor shaft 21, a rotor lamination 23 and an axial fixing sleeve 24. The rotor lamination 23 is coaxially sleeved on the outer periphery of the middle part of the motor shaft 21. The outer periphery of the rotor lamination 23 is provided with a plurality of clamping ribs arranged in an annular array. A clamping groove for clamping a single magnetic steel 22 is formed between each adjacent two clamping ribs, so that the six magnetic steels 22 are clamped in sequence on the outer periphery of the rotor lamination 23.

[0031] The axial fixing sleeve 24 is provided with two, and is located on both sides of the rotor lamination 23 in the axial direction, the axial fixing sleeve 24 is annular structure, its fixed sleeve is arranged on the outer periphery of the motor shaft 21, and the outer periphery of the side of the axial fixing sleeve 24 towards the rotor lamination 23 is provided with a whole circle annular flange 241, so that the axial fixing sleeve 24 forms abutting fixation to the axial both ends of the magnetic steel 22, and the flange 241 is annularly arranged on the outer periphery of the magnetic steel 22, and forms radial abutting fixation with the magnetic steel 22, and the above forms sufficient locking positioning of the magnetic steel 22.

[0032] Preferably, referring to Figure 3 , the outer periphery of the both ends of the magnetic steel 22 in the axial direction is provided with a first chamfer surface, and the inner periphery of the flange 241 is provided with a second chamfer surface, and in the installation, the first chamfer surface and the second chamfer surface form a surface-to-surface abutting, and then the chamfer surface forms locking positioning of the magnetic steel 22 in the axial and radial directions.

[0033] Among them, the axial one end of the motor shaft 21 is provided with a threaded connection structure of external thread or internal thread, which is used for connecting with the tool head of the angle grinder, and the tool head of the angle grinder includes cutting blade, grinding blade, louver, steel wire wheel and the like.

[0034] The rotor 2 is further sleeved with the stator 1, referring to Figure 4 to Figure 6 , the stator 1 and the rotor 2 form a motor structure, wherein the rotor 2 reduces the gap between the exposed magnetic steel 22 and the inner periphery of the stator 1, so as to reasonably enhance the torque formed by the rotor 2 and the stator 1.

[0035] The stator 1 is composed of a plurality of stator laminations 11, referring to Figure 7 , the stator lamination 11 is in the shape of an I-beam, and an independent winding is arranged at the middle part of each stator lamination 11, and a plurality of stator laminations 11 are arranged in a circular array to form a circular stator 1 structure, wherein the stator lamination 11 is provided with a clamping strip and a clamping groove at the front and back ends in the circumferential direction, respectively, so as to be clamped and matched with the front and back adjacent stator laminations 11 respectively, to ensure the accurate positioning between the stator laminations 11 and the stable structure of the stator 1 when combined.

[0036] One end of the stator 1 in the axial direction is also provided with a circuit board 12 and a protective sleeve, the circuit board 12 is annular structure, and is distributed along the outer periphery of the stator 1, the winding on each stator lamination 11 is provided with a pin, so that the pin of each winding is electrically connected with the circuit board 12, so that all the windings of the stator 1 are connected through the circuit board 12, and the protective sleeve is sleeved on the circuit board 12 to form protection.

[0037] Obviously, the described embodiments are only part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

Claims

1. A brushless direct drive angle grinder rotor, characterized by, The motor shaft (21), the rotor lamination (23) and two axial fixing sleeves (24) are included, the rotor lamination (23) is sleeved on the outer periphery of the motor shaft (21), the outer periphery of the rotor lamination (23) is provided with a plurality of magnetic steel (22) arranged in a ring array centering on the motor shaft (21), and the axial fixing sleeve (24) is sleeved on the outer periphery of the motor shaft (21) and is respectively clamped with the axial both ends of the magnetic steel (22), so as to lock the magnetic steel (22).

2. A brushless direct drive angle grinder rotor according to claim 1, characterized in that, The number of the magnetic steel (22) is six.

3. A brushless direct drive angle grinder rotor according to claim 1, characterized in that, The outer periphery of the rotor lamination (23) is provided with a plurality of clamping ribs arranged in a ring array, and the clamping slots for clamping the magnetic steel (22) are formed between adjacent clamping ribs.

4. A brushless direct drive angle grinder rotor according to claim 1, characterized in that, The outer periphery of the axial fixing sleeve (24) is provided with a ring-shaped flange (241) protruding towards the magnetic steel (22), and the flange (241) abuts against the outer periphery of the magnetic steel (22).

5. A brushless direct drive angle grinder rotor according to claim 4, characterized in that, The outer periphery of the magnetic steel (22) is provided with a first chamfer surface, and the inner periphery of the flange (241) is provided with a second chamfer surface for abutting against the first chamfer surface.

6. A brushless direct drive angle grinder rotor according to claim 1, characterized in that, The shaft end of the motor shaft (21) is provided with a thread for mounting a tool head.

7. A brushless direct drive angle grinder motor using the brushless direct drive angle grinder rotor according to any one of claims 1-6, characterized in that, A stator (1) is further included, the stator (1) is sleeved on the outer periphery of the rotor, and the inner wall of the stator (1) and the outer wall of the magnetic steel (22) form a set gap.

8. A brushless direct drive angle grinder motor according to claim 7, characterized in that, The stator (1) includes a plurality of stator laminations (11) arranged in a ring array, and the stator laminations (11) are provided with windings.

9. A brushless direct drive angle grinder motor according to claim 8, characterized in that, The stator lamination (11) is in an I-shaped structure, and the stator lamination (11) is respectively provided with a clamping strip and a clamping slot on both sides.

10. A brushless direct drive angle grinder motor according to claim 8, characterized in that, A circuit board (12) is further included, the circuit board (12) is arranged at one axial end of the stator (1), and the circuit board (12) is connected with the winding.

Images