An eccentric brushless motor

Abstract

The utility model discloses an eccentric brushless motor. The eccentric brushless motor includes a stator assembly, the stator assembly includes a stator core, the stator core is formed by a plurality of stator punching sheets, the stator punching sheet includes a yoke, the outer contour of the yoke is circular, the inner side of the yoke is provided with an eccentric hole which is eccentric with the outer contour of the yoke, the side of the yoke close to the eccentric hole is provided with a plurality of short straight teeth, the side of the yoke far from the eccentric hole is provided with a plurality of long straight teeth, the outer side of the long straight teeth is provided with a stator winding which is a phase, and the long and short straight teeth are arranged uniformly around the eccentric hole. The utility model solves the problem of small output force in the prior art.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to an eccentric brushless motor. Background Technology

[0002] There is a Chinese utility model patent with publication number CN203617868U, entitled "A High Slot Fill Rate, High Performance Open Slot Straight Gear Permanent Magnet Motor". Its description states that "eight armature straight teeth are evenly distributed on the stator core 1, and a set of concentrated windings is wound on every other armature tooth, forming a single phase." Referring to the accompanying drawings, the eight armature straight teeth are evenly distributed around the center of the stator core, and the eight armature straight teeth are of the same length. Within the same space, the potential distribution of each winding is relatively small, affecting the motor's output force. Utility Model Content

[0003] The purpose of this invention is to provide an eccentric brushless motor with high output force.

[0004] To achieve the above-mentioned objectives of this utility model, the eccentric brushless motor of this utility model adopts the following technical solution:

[0005] An eccentric brushless motor includes a stator assembly, which includes a stator core. The stator core is formed by stacking several stator laminations. Each stator lamination includes a yoke. The outer contour of the yoke is circular. An eccentric hole that is not concentric with the outer contour of the yoke is provided on the inner side of the yoke. A plurality of short straight teeth are provided on the side of the yoke adjacent to the eccentric hole, and a plurality of long straight teeth are provided on the side of the yoke away from the eccentric hole. A stator winding forming a single phase is provided on the outer side of the long straight teeth. The long and short straight teeth are evenly arranged in a circle around the eccentric hole.

[0006] Preferably, the inner edge of the yoke is provided with spacer teeth between adjacent long straight teeth, between adjacent short straight teeth, and between adjacent long and short straight teeth.

[0007] Preferably, the stator winding includes a coil frame sleeved on the outside of the long straight teeth, and enameled wire is wound on the coil frame.

[0008] Preferably, it also includes a rotor assembly, which includes a plastic housing, an inner cavity of which is provided with a bearing for fitting the rotating shaft, and a rotor permanent magnet is provided on the outer side of one end of the plastic housing that extends into the stator core.

[0009] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0010] By using an eccentric design, the length of the straight teeth on one side is shortened and the length of the straight teeth on the other side is lengthened, thereby forming multiple long straight teeth on one side of the inner edge of the yoke for connecting the stator winding. As a result, the radial length of the stator winding is increased, which in turn increases the potential distribution of the stator winding and improves the motor output force. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the eccentric brushless motor of this utility model.

[0012] Figure 2 This is a schematic diagram of the stator lamination structure.

[0013] Figure 3 This is a schematic diagram of the stator winding structure.

[0014] Figure 4 This is a schematic diagram of the rotor assembly.

[0015] Among them, 1 is stator assembly, 11 is stator core, 111 is yoke, 112 is eccentric hole, 113 is short straight tooth, 114 is long straight tooth, 115 is spacer tooth, 12 is stator winding, 121 is coil bobbin, 122 is enameled wire, 2 is rotor assembly, 21 is plastic housing, 22 is bearing, and 23 is rotor permanent magnet. Detailed Implementation

[0016] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are only for illustrating the present invention and not for limiting the scope of the present invention. After reading the present invention, any modifications of the present invention in various equivalent forms by those skilled in the art will fall within the scope defined by the appended claims.

[0017] like Figure 1-4As shown, an eccentric brushless motor includes a stator assembly 1 and a rotor assembly 2. The stator assembly includes a stator core 11, which is formed by stacking several stator laminations. Each stator lamination includes a yoke 111 with a circular outer contour. An eccentric hole 112, which is not concentric with the outer contour of the yoke, is formed on the inner side of the yoke. Three short straight teeth 113 of uniform width are integrally formed on the side of the yoke adjacent to the eccentric hole, with the middle short straight tooth being shorter. Three long straight teeth 114 of uniform width and length are integrally formed on the side of the yoke away from the eccentric hole. The long and short straight teeth are evenly arranged circumferentially around the eccentric hole (the pitch angle of the center lines of the long and short straight teeth is 60°). The inner edge of the yoke is integrally formed between adjacent long straight teeth, adjacent short straight teeth, and adjacent long and short straight teeth. The spacer 115 increases the spacing between the teeth to match a 10-pole rotor, improving the uniformity of the magnetic field distribution and ensuring a more stable output force. The outer side of the long straight tooth is fitted with a stator winding 12 that forms its own phase. The stator winding includes a coil frame 121 fitted on the outer side of the long straight tooth, and enameled wire 122 wound on the coil frame. Since the tooth shoe is eliminated, assembly is more convenient. The stator winding forms its own phase, avoiding cross-wire and reducing copper loss. The rotor assembly includes a plastic housing 21. In this embodiment, the plastic housing is an impeller plastic housing. The inner cavity of the plastic housing is fitted with a bearing 22 for fitting the shaft. The outer side of the end of the plastic housing that extends into the stator core is fitted with a rotor permanent magnet 23. The rotor assembly has no iron core, which can reduce costs. The rotor permanent magnet is directly exposed on the outside, which can reduce the air gap and further improve the output force of the motor.

[0018] The specific working process and principle of this utility model are as follows: Three stator windings are energized, with the current flowing through the middle winding in the opposite direction to the other two. This causes the three-phase magnetic field to shift sequentially with a 120° electrical angle difference, generating a rotating magnetic field that interacts with the magnetic field generated by the rotor permanent magnet to produce torque, driving the impeller's plastic housing to rotate. This utility model, through an eccentric design, shortens the length of the straight teeth on one side and lengthens the length of the straight teeth on the other side. Within the same or limited space, this increases the potential distribution of the stator windings, thereby increasing the motor's output force and meeting usage requirements.

[0019] The detailed description listed above is merely a specific description of feasible implementation methods of this utility model and is not intended to limit the scope of protection of this utility model.

Claims

1. An eccentric brushless motor, comprising a stator assembly, the stator assembly including a stator core, the stator core being formed by stacking a plurality of stator laminations, each stator lamination including a yoke, the outer contour of the yoke being circular, characterized in that: The inner side of the yoke is provided with an eccentric hole that is not concentric with the outer contour of the yoke. The side of the yoke adjacent to the eccentric hole is provided with multiple short straight teeth, and the side of the yoke away from the eccentric hole is provided with multiple long straight teeth. The outer side of the long straight teeth is provided with a stator winding that forms its own phase. The long and short straight teeth are arranged evenly in a circle around the eccentric hole.

2. The eccentric brushless motor according to claim 1, characterized in that: The inner edge of the yoke is provided with spacer teeth between adjacent long straight teeth, between adjacent short straight teeth, and between adjacent long and short straight teeth.

3. The eccentric brushless motor according to claim 1, characterized in that: The stator winding includes a coil frame sleeved on the outside of the long straight teeth, and enameled wire is wound on the coil frame.

4. The eccentric brushless motor according to claim 1, characterized in that: It also includes a rotor assembly, which includes a plastic housing. The inner cavity of the plastic housing is provided with a bearing for fitting the rotating shaft, and a rotor permanent magnet is provided on the outer side of one end of the plastic housing that extends into the stator core.

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