CN211579723U

CN211579723U - Rotor structure for effectively reducing cogging torque of brushless direct current motor

Info

Publication number: CN211579723U
Application number: CN201922342662.8U
Authority: CN
Inventors: 陈刚; 易恭才; 闫鲲
Original assignee: Shenzhen Power Motor Industrial Co Ltd
Current assignee: Shenzhen Power Motor Industrial Co Ltd
Priority date: 2019-12-20
Filing date: 2019-12-20
Publication date: 2020-09-25
Anticipated expiration: 2029-12-20

Abstract

The utility model relates to an effectively reduce rotor structure of brushless DC motor tooth's socket torque, including pivot, magnet steel and a plurality of rotor core, the pivot includes axle body, first axis body, second axis body, axle tail and spindle nose, rotor core with axle body interference fit connects, rotor core's outer wall is equipped with a plurality of bosss, adjacent two along the circumferencial direction array form the recess between the boss, it is with to paste in the recess the magnet steel, it is a plurality of rotor core is in the setting of staggering around the same direction of axis homogeneous rotation in the axial of pivot, the first and last two that arrange in proper order of the axial of pivot the value scope of the angle that staggers at the biggest of rotor core is 5 ~ 35, the utility model discloses can reach the mesh that reduces tooth's socket torque.

Description

Rotor structure for effectively reducing cogging torque of brushless direct current motor

Technical Field

The utility model belongs to the technical field of the motor and specifically relates to an effectively reduce rotor structure of brushless DC motor tooth's socket torque.

Background

In the permanent magnet brushless motor, the rotor generally adopts the structure that a plurality of N, S adjacent column-shaped permanent magnet steels are uniformly attached to the surface of a rotor core, and due to the grooving reason on a stator core, certain tooth space torque exists, and adverse effect is generated on the operation of the motor.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a through set up the even dislocation of stator core of multistage in the pivot then paste the magnet steel that corresponds on the rotor core surface and reach the rotor structure who reduces tooth's socket torque.

In view of the above, it is necessary to provide a rotor structure for effectively reducing cogging torque of a brushless dc motor, which includes a rotating shaft, magnetic steel, and a plurality of rotor cores; the rotating shaft comprises a shaft body, a first shaft body and a second shaft body are respectively arranged at two opposite side ends of the shaft body, a shaft tail is arranged at one end, far away from the shaft body, of the first shaft body, and shaft heads are sequentially arranged at one end, far away from the shaft body, of the second shaft body; rotor core with shaft body interference fit connects, rotor core's outer wall is equipped with a plurality of bosss along the circumferencial direction array, adjacent two form the recess between the boss, it has to paste in the recess the magnet steel, it is a plurality of rotor core is in the axial of pivot is gone up to the same direction of axis line uniform rotation stagger and is set up, the first last two of the axial of pivot is arranged in proper order rotor core's the value range of the angle of staggering at the utmost is 5 ~ 35.

Further, the boss gradually narrows from top to bottom, and the boss and the rotor core are integrally formed.

Further, the magnetic steel is tile magnetic rigidity.

Furthermore, a punching rib is arranged between the shaft body and the rotating shaft.

Further, two adjacent rotor cores are attached to each other.

The beneficial effects of the utility model reside in that: after the motor rotor is improved, the normal performance of the motor is met, the cogging torque can be reduced by about 25%, the operation process can be realized by slightly adjusting, and the manufacturing cost is low.

Drawings

Fig. 1 is a schematic view of the overall structure of the embodiment of the present invention.

Fig. 2 is a schematic view of a rotating shaft structure according to an embodiment of the present invention.

Fig. 3 is a schematic structural diagram of a rotor core according to an embodiment of the present invention.

Fig. 4 is a side view of the overall structure of an embodiment of the present invention.

In the figure, a rotating shaft 100, a shaft body 110, a first shaft body 120, a second shaft body 130, magnetic steel 200, a shaft tail 140, a shaft head 150, magnetic steel 200, a rotor core 300, a boss 310, a groove 320 and a maximum staggering angle alpha are provided.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the following description, taken in conjunction with the accompanying drawings and embodiments, will explain in further detail the present invention, which is a rotor structure for effectively reducing the cogging torque of a brushless dc motor. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

Referring to fig. 1-4, a rotor structure for effectively reducing cogging torque of a brushless dc motor according to an embodiment of the present invention includes a rotating shaft 100, a magnetic steel 200, and a plurality of rotor cores 300; the rotating shaft 100 comprises a shaft body 110, a first shaft body 120 and a second shaft body 130 are respectively arranged at two opposite side ends of the shaft body 110, a shaft tail 140 is arranged at one end, far away from the shaft body 110, of the first shaft body 120, and shaft heads 150 are sequentially arranged at one end, far away from the shaft body 110, of the second shaft body 130; rotor core 300 with shaft body 110 interference fit is connected, rotor core 300's outer wall is equipped with a plurality of bosss 310 along the circumferencial direction array, adjacent two form recess 320 between the boss 310, the magnet steel 200 is attached to in the recess 320, and is a plurality of rotor core 300 is in the setting of staggering evenly rotating around the same direction of axis in the axial of pivot 100, the first two that the axial of pivot 100 was arranged in proper order the value scope of the angle alpha that staggers of rotor core 300 the biggest is 5 ~ 35.

It can be understood that the maximum offset angle α is required to be different for different motors and different stator core slot widths, and the uniform rotation offset of the plurality of rotor cores 300 makes the formed electromagnetic torque and induced electromotive force approximate to the average value of the same rotor conducting bar uniformly distributed in a circumferential range, so that the additional torque caused by the tooth harmonic magnetic field can be effectively weakened, the electromagnetic vibration and noise can be reduced, the electromagnetic vibration and noise can cross a small slot on a road in comparison with the situation that an automobile needs to cross the small slot on the road, if the automobile passes through the small slot in the direction perpendicular to the slot, the vibration is large, and the automobile needs to be more stable if the automobile passes through the small slot on the road obliquely.

Referring to fig. 3, the boss 310 gradually narrows from top to bottom, the boss 310 and the rotor core 300 may be detachably connected, and may be integrally formed, and preferably, the boss 310 and the rotor core 300 are integrally formed.

It can be understood that the integrally formed structure is more stable, maintaining the stability of the boss 310 when the rotor core 300 is rotated at a high speed.

Preferably, the magnetic steel 200 is tile magnetic steel.

It will be appreciated that this is not primarily for obtaining high torque, which is a reason in terms of typical physical shape, in order to achieve a uniform air gap, reducing the magnetic gap and thus achieving higher efficiency.

Preferably, a punching rib is arranged between the shaft body 110 and the rotating shaft 100.

It can be understood that the ribs on the shaft body 110 are used to secure the iron core of the motor rotor on the shaft, and to prevent rotation.

Referring to fig. 1, two adjacent rotor cores 300 are attached to each other.

Understandably, this guarantees the stability of the rotor structure and the magnetic field.

The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above description in any form, and although the present invention has been disclosed with reference to the preferred embodiment, it is not limited to the present invention, and any skilled person in the art can make modifications or changes equivalent to the equivalent embodiment of the above embodiments without departing from the scope of the present invention.

Claims

1. The utility model provides an effectively reduce rotor structure of brushless DC motor cogging torque, includes pivot (100) and magnet steel (200), its characterized in that: further comprising a plurality of rotor cores (300);

the rotating shaft (100) comprises a shaft body (110), a first shaft body (120) and a second shaft body (130) are respectively arranged at two opposite side ends of the shaft body (110), a shaft tail (140) is arranged along one end, far away from the shaft body (110), of the first shaft body (120), and shaft heads (150) are sequentially arranged along one end, far away from the shaft body (110), of the second shaft body (130);

rotor core (300) with shaft body (110) interference fit connects, the outer wall of rotor core (300) is equipped with a plurality of bosss (310) along the circumferencial direction array, adjacent two form recess (320) between boss (310), be scribbled the gluing agent in recess (320), magnet steel (200) attached with in recess (320), it is a plurality of rotor core (300) are in the setting of staggering around the same direction of axis homogeneous rotation in the axial of pivot (100), the first last two that the axial of pivot (100) was arranged in proper order the value range of the angle (alpha) that staggers of the biggest of rotor core (300) is 5 ~ 35.

2. A rotor structure for effectively reducing cogging torque of a brushless dc motor as claimed in claim 1, wherein: the boss (310) is gradually narrowed from top to bottom, and the boss (310) and the rotor core (300) are integrally formed.

3. A rotor structure for effectively reducing cogging torque of a brushless dc motor as claimed in claim 1, wherein: the magnetic steel (200) is tile magnetic steel.

4. A rotor structure for effectively reducing cogging torque of a brushless dc motor as claimed in claim 1, wherein: a punching rib is arranged between the shaft body (110) and the rotating shaft (100).

5. A rotor structure for effectively reducing cogging torque of a brushless dc motor as claimed in claim 1, wherein: two adjacent rotor cores (300) are attached to each other.