CN211655863U

CN211655863U - Brushless motor rotor

Info

Publication number: CN211655863U
Application number: CN202020358910.8U
Authority: CN
Inventors: 陈云华
Original assignee: Longzhong Motor Technology Kunshan Co ltd
Current assignee: Longzhong Motor Technology Kunshan Co ltd
Priority date: 2020-03-20
Filing date: 2020-03-20
Publication date: 2020-10-09
Anticipated expiration: 2030-03-20

Abstract

The utility model discloses a brushless motor rotor, including rotor core, locate rotor magnetic pole that a plurality of angular interval distribution such as circumference in the rotor core periphery and be used for the cover to establish rotor core and the pivot that links firmly with it, there is the same rotor core of multistage along angular interval distribution such as axial in the pivot of its characterized in that, and sets up mutually by mistake between the adjacent rotor core, and rotor magnetic pole on these rotor cores adopts the radial radiation of segmentation dislocation to magnetize for rotor magnetic pole circumference forms the N utmost point and the S utmost point in turn. The utility model adopts the segmented oblique pole structure, the tooth space torque of the motor is obviously reduced, the noise and vibration of the motor during working are effectively reduced, and the working performance is improved; and the rotor magnetic poles of the multi-section rotor iron core are magnetized by adopting multi-magnetic pole radial radiation, so that the phenomenon that the interlaced part of the adjacent magnetic poles is not magnetized due to integral oblique magnetization in the prior art is avoided, and the output torque of the motor is further ensured.

Description

Brushless motor rotor

Technical Field

The utility model relates to a brushless motor rotor belongs to motor technical field.

Background

With the development of modern traditional automobiles and new energy automobiles and the requirement of intelligent unmanned automobiles, brushless motors are more and more widely applied. The brushless motor has the advantages of small volume, light weight, high efficiency, energy conservation and the like.

In order to arrange an armature winding (stator) in a brushless motor, a slot needs to be provided in an armature core. This results in interaction between the permanent magnets on the rotor core and the armature core, producing cogging torque, which is caused by the tangential component of the interaction force between the rotor permanent magnets and the armature cogging. The cogging torque can cause the torque fluctuation of the motor, vibration and noise are generated, and the rotation speed fluctuation occurs at the same time, so that the motor cannot run stably, and the performance of the motor is influenced. Therefore, the larger the motor cogging torque is, the larger the vibration and noise are, and the worse the motor stability is. And under the premise of a certain armature core specification, the size of the cogging torque is mainly related to the design structure form of the rotor (including the distribution condition of the rotor core and the upper magnetic poles thereof).

At present, some measures are adopted in the development of brushless motors in the industry to reduce the cogging torque, but the effect is not good. And for molded brushless motor products, compared with the mode of completely changing the whole motor, the mode of improving the performance by only pertinently improving and replacing one part is more economical. The design of the rotor is the main improvement direction, namely, the rotor is improved in a reasonable design on one side, so that the cogging torque of the brushless motor during the whole operation is reduced, the noise and the vibration of the brushless motor are reduced, and the performance and the working stability of the brushless motor are improved. However, in the prior art, no good solution exists so far, and the rotor still needs to be optimized and improved.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a brushless motor rotor, its tooth's socket torque that is used for further reducing the motor behind the brushless motor, and then reduces brushless motor's noise and vibration, improves its performance and job stabilization nature.

The technical scheme of the utility model is that: the utility model provides a brushless motor rotor, including rotor core, locate the rotor magnetic pole of a plurality of angular interval distribution such as circumference on the rotor core periphery and be used for the cover to establish rotor core and the pivot that links firmly with it, this brushless motor rotor of its characterized in that adopts segmentation oblique utmost point structure, it has the same rotor core of multistage along axial interval distribution such as, and stagger mutually between the adjacent rotor core sets up, rotor magnetic pole on these rotor cores adopts the radial radiation of segmentation dislocation to magnetize, make rotor magnetic pole circumference form the N utmost point and the S utmost point in turn.

Furthermore, in the present invention, the rotor core has two or three sections along the axial direction of the rotating shaft.

Further, the utility model discloses in every section the rotor magnetic pole quantity that sets up in the rotor core periphery is 6 or 8 or 10.

Furthermore, in the present invention, when the number of the rotor magnetic poles is 6, the phase-offset angle between the adjacent rotor cores is 10 ° or 6.7 °.

Furthermore, in the present invention, when the number of the rotor magnetic poles is 8, the phase-offset angle between the adjacent rotor cores is 7.5 ° or 5 °.

Furthermore, in the present invention, when the number of the rotor magnetic poles is 10, the phase-offset angle of the adjacent rotor cores is 3 ° or 2 °.

Further, in the present invention, the rotor magnetic pole is a tile-shaped high performance magnetic steel.

The utility model discloses adopt the radial radiation of segmentation dislocation to magnetize to the rotor magnetic pole, this is also a slant mode of magnetizing, nevertheless is different from the whole slant among the prior art and magnetizes, contains following characteristic:

further, the utility model discloses the oblique angle of filling of the rotor magnetic pole on every section rotor core is 0 in, and the dislocation angle an that the rotor magnetic pole on the adjacent rotor core magnetized is the same with adjacent rotor core phase error angle. The magnetizing offset angle a in the present application can also be understood as an oblique magnetizing angle in the present application.

Compared with the prior art, the utility model the advantage be:

1) the utility model adopts a segmented oblique pole structure, the tooth space torque of the motor is obviously reduced, the noise and vibration of the motor during working are effectively reduced, and the working performance and stability of the motor are improved;

2) the utility model provides a rotor magnetic pole adopts the radial radiation of segmentation dislocation to magnetize, has avoided adopting current whole slant to magnetize and has had the phenomenon that the magnetic pole staggered position part magnetic pole of two sections rotor core does not fill magnetism, has further guaranteed brushless motor's output torque, has effectively reduced brushless motor's tooth's socket torque, and has reduced the noise and the vibration of motor during operation. Therefore the utility model discloses specially adapted modern traditional car, new energy automobile and intelligence are rotor system for electric power assisted steering motor and electric brake motor for unmanned driving car.

Drawings

The invention will be further described with reference to the following drawings and examples:

fig. 1 is a schematic perspective view of an embodiment of the present invention;

fig. 2 is a front view of a rotor magnetic pole magnetizing state of a brushless motor rotor according to the prior art (in the figure, an oblique line a is a conventional oblique charging representation line, and a1 is an oblique charging angle);

FIG. 3 is a front view of the brushless motor of FIG. 1 showing the rotor of the brushless motor in a magnetized state (line B is a diagonal line in the present case);

FIG. 4 is a right side view of the brushless motor of the embodiment of FIG. 1 with the rotor poles magnetized;

fig. 5 is a schematic perspective view of another embodiment of the present invention;

FIG. 6 is a front view of the brushless motor of FIG. 5 showing the rotor of the brushless motor in a magnetized state (line B is the oblique line in this case);

fig. 7 is a right side view of the rotor pole of the brushless motor of the embodiment of fig. 5 in a magnetized state.

Wherein: 1. a rotor core; 2. a rotor magnetic pole; 3. a rotating shaft; a. the dislocation angle of magnetization.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

Example 1:

first, as shown in fig. 1, fig. 3 and fig. 4, the present invention discloses a specific embodiment of a brushless motor rotor, which adopts a segmented skewed pole structure, and is formed by a rotating shaft 3, a two-section rotor core 1 sleeved and fixedly connected to the rotating shaft 3, and a plurality of circumferentially equiangular spaced rotor magnetic poles 2 arranged on the periphery of each section of rotor core 1, and is combined with fig. 1, fig. 3 and fig. 4.

In this embodiment, two sections of rotor cores 1 are distributed at equal intervals along the axial direction of the rotating shaft 3, two adjacent sections are arranged in a staggered manner, and the number of rotor magnetic poles 2 distributed on the peripheral surface of each section of rotor core 1 is 6, and each section of rotor magnetic pole is made of tile-shaped high-performance magnetic steel. The phase-staggered angle of the adjacent two sections of rotor cores 1 is 10 degrees.

Meanwhile, in the embodiment, the rotor magnetic poles 2 on the rotor iron cores 1 are magnetized by means of segmented dislocation radial radiation, so that N poles and S poles are alternately formed by the rotor magnetic poles in the circumferential direction, the magnetizing dislocation angle a is the same as the dislocation angle of the rotor iron cores 1 and is also 10 degrees, and the oblique charging angle of the rotor magnetic poles 2 on each segment of the rotor iron cores 1 is 0 degree as shown in fig. 3 and 4 (a straight line B in fig. 3 is an oblique charging indicating line in the case). The overall oblique magnetization of the conventional rotor shown in fig. 2 is different from the overall oblique magnetization (the oblique line a in fig. 2 is an oblique magnetization indicating line), so that the phenomenon that the magnetic poles 2 at the staggered positions of the two sections of magnetic poles of the rotor core 1 are not magnetized is avoided, and the overall output torque of the brushless motor can be further ensured.

The embodiment adopts a segmented skewed pole structure, so that the tooth space torque of the motor is obviously reduced, the noise and vibration of the motor during working are effectively reduced, and the working performance and stability of the motor are improved; meanwhile, the rotor magnetic poles are magnetized by adopting segmented staggered radial radiation, so that the phenomenon that the magnetic poles at the staggered positions of the two sections of rotor iron core magnetic poles are not magnetized due to the adoption of the conventional integral oblique magnetization is avoided, the output torque of the brushless motor is further ensured, the tooth space torque of the brushless motor is effectively reduced, and the noise and vibration of the motor during working are reduced. Therefore the utility model discloses specially adapted modern traditional car, new energy automobile and intelligence are rotor system for electric power assisted steering motor and electric brake motor for unmanned driving car.

Example 2: the difference between this embodiment and embodiment 1 is that the phase-offset angle of two adjacent rotor cores 1 is 6.7 °, and correspondingly, the magnetizing offset angle a of the rotor magnetic pole 2 is also 6.7 °, and the specific structure can still refer to fig. 1, fig. 3, and fig. 4.

Example 3: referring to fig. 5, 6 and 7, the brushless motor rotor of the present embodiment also adopts a segmented skewed pole structure, and is formed by a rotating shaft 3, three segments of rotor cores 1 sleeved and fixedly connected to the rotating shaft 3, and a plurality of rotor magnetic poles 2 arranged on the periphery of each segment of rotor core 1 and distributed circumferentially at equal angular intervals.

In this embodiment, three sections of rotor cores 1 are distributed at equal intervals along the axial direction of the rotating shaft 3, two adjacent sections are arranged in a staggered manner, and the number of rotor magnetic poles 2 distributed on the peripheral surface of each section of rotor core 1 is 8, and each section of rotor magnetic pole is made of tile-shaped high-performance magnetic steel. The phase-staggered angle of the adjacent two sections of rotor cores 1 is 7.5 degrees.

Meanwhile, in the embodiment, the rotor magnetic poles 2 on the rotor iron cores 1 are magnetized by means of segmented dislocation and radial radiation, so that N poles and S poles are alternately formed by the rotor magnetic poles in the circumferential direction, the magnetizing dislocation angle a is the same as the rotor iron cores 1 and is also 7.5 degrees, and the oblique magnetization angle of the rotor magnetic pole 2 on each segment of the rotor iron cores 1 is 0 degree, as shown in fig. 6 and 7 (a straight line B in fig. 6 is an oblique magnetization indicating line in the case and is parallel to the axis of the rotor iron cores 1).

Example 4: the present embodiment is the same as embodiment 3 except that the phase-offset angle of two adjacent rotor cores 1 is 5 °, and correspondingly, the magnetizing offset angle a of the rotor magnetic pole 2 is also 5 °, and the specific structure can still refer to fig. 5, 6, and 7.

Example 5: the brushless motor rotor of the embodiment also adopts a segmented skewed pole structure, and is formed by a rotating shaft 3, two sections of rotor cores 1 sleeved and fixedly connected on the rotating shaft 3 and a plurality of rotor magnetic poles 2 which are circumferentially distributed at equal angular intervals and arranged on the periphery of each section of rotor core 1.

In this embodiment, two sections of rotor cores 1 are distributed along the rotating shaft 3 at equal intervals, and two adjacent sections are arranged in a staggered manner, and the number of rotor magnetic poles 2 distributed on the peripheral surface of each section of rotor core 1 is 10, and each section of rotor magnetic pole is made of tile-shaped high-performance magnetic steel. The phase-staggered angle of the adjacent two sections of rotor cores 1 is 3 degrees.

Meanwhile, in the embodiment, the rotor magnetic poles 2 on the rotor iron cores 1 are magnetized by means of segmented dislocation radial radiation, so that N poles and S poles are alternately formed in the circumferential direction of the rotor magnetic poles, the magnetizing dislocation angle a is the same as the dislocation angle of the rotor iron cores 1 and is also 3 degrees, and the oblique magnetization angle of the rotor magnetic pole 2 on each segment of the rotor iron cores 1 is 0 degree. The present embodiment does not give any drawings, and the overall architecture thereof can refer to fig. 1, fig. 3 and fig. 4.

Example 6: the present embodiment is the same as embodiment 5 except that the phase-offset angle of two adjacent rotor cores 1 is 2 °, and correspondingly, the magnetizing offset angle a of the rotor magnetic pole 2 is also 2 °. The present embodiment does not give any drawings, and the overall architecture thereof can refer to fig. 1, fig. 3 and fig. 4.

The above description is only for the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are all covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope defined by the claims.

Claims

1. The utility model provides a brushless motor rotor, including rotor core (1), locate rotor magnetic pole (2) of a plurality of circumference equal angle interval distribution in rotor core (1) periphery and be used for the cover to establish rotor core (1) and pivot (3) that link firmly with it, this brushless motor rotor of its characterized in that adopts segmentation oblique utmost point structure, it has the same rotor core (1) of multistage along axial equal interval distribution on its pivot (3), and the phase error sets up between adjacent rotor core (1), rotor magnetic pole (2) on these rotor core (1) adopt the radial radiation of segmentation dislocation to magnetize, make rotor magnetic pole (2) circumference form N utmost point and S utmost point in turn.

2. A brushless electric machine rotor according to claim 1, wherein: two sections or three sections are distributed on the rotor iron core (1) along the axial direction of the rotating shaft (3).

3. A brushless electric machine rotor according to claim 1, wherein: the number of the rotor magnetic poles (2) arranged on the periphery of each section of the rotor iron core (1) is 6, 8 or 10.

4. A brushless electric machine rotor according to claim 3, wherein: when the number of the rotor magnetic poles (2) is 6, the phase-staggered angle of the adjacent rotor iron cores (1) is 10 degrees or 6.7 degrees.

5. A brushless electric machine rotor according to claim 3, wherein: when the number of the rotor magnetic poles (2) is 8, the phase-staggered angle of the adjacent rotor iron cores (1) is 7.5 degrees or 5 degrees.

6. A brushless electric machine rotor according to claim 3, wherein: when the number of the rotor magnetic poles (2) is 10, the phase-staggered angle of the adjacent rotor iron cores (1) is 3 degrees or 2 degrees.

7. A brushless electric machine rotor according to claim 1, wherein: the rotor magnetic pole (2) is tile-shaped high-performance magnetic steel.

8. A brushless electric machine rotor according to claim 1, wherein: the oblique charging angle of the rotor magnetic pole (2) on each section of the rotor iron core (1) is 0 degree, and the magnetizing dislocation angle a of the rotor magnetic pole (2) on the adjacent rotor iron core (1) is the same as the dislocation angle a of the adjacent rotor iron core (1).