TWI467893B - A rotor with cut arc structure - Google Patents

Description

Rotor with arc-cut structure

The invention relates to a rotor with a curved arc structure, in particular to a rotor core having a core portion corresponding to a different arc and a magnet accommodating groove, and the magnet is a fan-shaped rotor.

In general, whether it is industrial applications, transportation or household electrical appliances, rotary electric machines (including motors and generators) are often used as sources of kinetic energy, electrical energy is converted into mechanical energy, and then the generated mechanical energy is made. Further application. The motor is divided into a permanent magnet brushless motor and a wound-type excitation field motor. Compared with the wound-type excitation field motor, the permanent magnet brushless motor rotor contains permanent magnets, which can eliminate the use of carbon brushes and slip rings. High efficiency, high power density, high durability, small size, good handling and easy maintenance, so the permanent magnet brushless motor has gradually replaced the traditional winding type excitation field motor.

In general, the conventional permanent magnet brushless motor includes a stator having a cogging structure and a rotor having a permanent magnet. Since the stator has a cogging structure, the air gap reluctance between the rotor and the stator when the rotor is operated relative to the stator As the position changes, the magnetic flux and energy in the magnetic circuit also change, thus causing a phenomenon of torque ripple, that is, the output torque of the motor changes up and down with time. Among them, the above-mentioned torque ripple easily causes the error of the motor in the rotation speed and the position control, and is also prone to vibration and noise, thereby affecting the rotational stability of the motor.

In the prior art, there are two methods for reducing or eliminating torque chopping, one of which reduces the size of the air gap equivalent flux. However, if the air gap equivalent magnetic flux is lowered due to the reduction of the torque, the driving torque will be reduced at the same time, so the method is rarely used; the other is to reduce the rate of change of the magnetic circuit equivalent reluctance with respect to the rotation angle. It is mainly a tooth groove structure on the armature core for accommodating the winding, and in the case of relative rotation with the magnetic pole core, the magnetic flux path is changed, causing a relative change of the equivalent magnetic reluctance of the magnetic circuit to generate a torsional torque.

However, in the conventional method of suppressing the torque, for example, reducing the total equivalent magnetoresistance change around the air gap, it is easy to increase the cost and time course of manufacturing, assembly, and inspection; Or the design of the oblique magnetic pole, although it can suppress vibration and noise, but in the process of practical production, it is often difficult to wind the wire and it is not easy to manufacture. Therefore, the existing rotor that can reduce the torque ripple is still improved. space.

In view of the prior art, in the prior art design of a rotor for reducing torque chopping, there are generally problems of increasing the cost and time course of manufacturing, assembly, and inspection, and problems of vibration and noise. Existing rotors still have room for improvement.

Accordingly, the main object of the present invention is to provide a rotor having a reduced arc structure, the rotor core having a plurality of core portions and a plurality of magnet receiving grooves, and the arc corresponding to the core portion is different from the magnet capacity. The circle corresponding to the groove The arc, and the magnet used in the rotor is fan-shaped, thereby improving the back electromotive force and reducing the torque ripple.

The present invention solves the problems of the prior art, and the necessary technical means is to provide a rotor having a curved structure, which is disposed in a stator of a motor and includes a rotating shaft, a rotor core and a plurality of sectors. magnet. The rotor core includes a plurality of core portions and a plurality of magnet receiving grooves. The core portions are integrally formed integrally with each other and have a first arc, and the first arc has a first center of curvature. The magnet accommodating groove is fan-shaped and is disposed between the iron core portions and corresponds to a second arc, the second arc is coupled to the first arc and corresponds to a second center of curvature, and the second The center of curvature is different from the center of the first curvature. The fan-shaped magnets are correspondingly accommodated in the magnet receiving slots.

In a preferred embodiment of the rotor having the arcuate structure, each of the core portions is coupled to each other by an outer connecting portion and an inner connecting portion, and each of the magnet receiving groove portions is disposed. Between the outer connecting portion and the inner connecting portion, and the outer connecting portion corresponds to the second arc. In addition, the first arc has a first radius of curvature corresponding to the first center of curvature, the second arc has a second radius of curvature corresponding to the second center of curvature, and the second radius of curvature is the first radius of curvature plus a bias The amount of shift, and the offset is one of 0 mm to 10 mm.

In the above preferred embodiment of the rotor having the arcuate structure, the fan-shaped magnets have a sector arc corresponding to the second arc, and the sector arc Corresponding to the first center of curvature has a certain opening angle, and the fixed angle is one of 70 degrees to 100 degrees. In addition, the rotor core is a silicon steel sheet, and the fan magnets are ferrite magnets, and each of the fan magnets is adjacent to the outer circumference of the stator parallel to the second arc.

Compared with the prior art, the rotor having the arc-cut structure provided by the present invention has a plurality of core portions and a plurality of magnet receiving grooves, and the arc corresponding to the core portion is different from The arc corresponding to the magnet accommodating groove and the magnet used in the rotor are fan-shaped, thereby effectively improving the counter electromotive force and reducing the torque chopping, thereby increasing the durability of the rotor. In addition, another effect of the present invention is that since each core portion is coupled to each other, mechanical strength can be increased, and thus it is suitable for high-speed use such as an air conditioner compressor motor, and the process can be simplified, and the present invention can be remanufactured. There is also no problem with the easy winding of the prior art.

The specific embodiments of the present invention will be further described by the following examples and drawings.

Since the combined embodiments of the rotor provided by the present invention are numerous, they will not be further described herein, and only a preferred embodiment will be specifically described.

Please refer to the first to third B drawings. The first figure shows a schematic view of a rotor with a curved structure according to a preferred embodiment of the present invention, and the second figure shows A schematic diagram of a sector magnet according to a preferred embodiment of the present invention, a second diagram showing a back electromotive force distortion simulation of a fan magnet design in accordance with a preferred embodiment of the present invention, and a second diagram B showing a sector magnet design in accordance with a preferred embodiment of the present invention. The schematic diagram of the torque chopping simulation, the third figure shows the first arc and the second arc of the preferred embodiment of the present invention, and the third A shows the first arc and the first embodiment of the preferred embodiment of the present invention. A schematic diagram of the back electromotive force simulation of the two arcs, and a third B diagram shows a torque simulation diagram of the first arc and the second arc of the preferred embodiment of the present invention.

As shown in the figure, the rotor 1 having the arc-cutting structure provided by the present invention is disposed in the stator 2 of a motor 100, and includes a rotating shaft 11, a rotor core 12 and a plurality of fan-shaped magnets 13 (in the figure) Only one is marked). The rotating shaft 11 is rotatable in the stator 2, and is made of a non-magnetic material, and the non-magnetic material is defined as having a relative magnetic permeability of not more than one, which is, for example, a metal of copper and lead, but is not limited to the above. The rest are known to those skilled in the art and will not be described again.

The rotor core 12 is a silicon steel sheet, but is not limited thereto, and the rotor core 12 includes a plurality of core portions 121 (only one is shown) and a plurality of magnet receiving slots 122 (only one is shown), iron The core portions 121 are integrally formed to be coupled to each other. Further, in the preferred embodiment of the present invention, each of the core portions 121 is coupled to each other by an outer connecting portion 14 and an inner connecting portion 15, wherein The outer connecting portion 14 is an outer diameter, and the inner connecting portion 15 is an inner diameter, that is, the outer diameter and the inner diameter of the rotor core 12 are connected to each other, wherein the core portion 121 has a first circular arc 1211.

The magnet accommodating groove 122 is fan-shaped and is opened in the core portions 121 Specifically, each of the magnet accommodating grooves 122 is disposed between the outer connecting portion 14 and the inner connecting portion 15, that is, each of the magnet accommodating grooves 122 is located at the core portion of the core. 121, between the outer connecting portion 14 and the inner connecting portion 15. In addition, the magnet accommodating groove 122 corresponds to the second circular arc 1221 , and the second circular arc 1221 is coupled to the first circular arc 1211 , and the outer connecting portion 14 corresponds to the second circular arc 1221.

The fan-shaped magnets 13 are ferrite magnets, and are correspondingly accommodated in the magnet-receiving grooves 122 (the fan-shaped magnets 13 are accommodated in the cross-sectional line in the figure, and the cross-sectional line magnet-receiving grooves 122 are not shown). That is, the sector magnet 13 also corresponds to the second arc 1221. In addition, the sector magnet 13 referred to in the preferred embodiment of the present invention means that it is curved adjacent to the outer side of the stator 2, and its curvature is parallel to the second circular arc 1221, and the inner side adjacent to the rotating shaft 11 is a straight line. Rather than having a curvature. Further, the fan-shaped magnet 13 (which may also be the magnet-receiving groove 122) may be designed by a fixed angle. For example, please refer to the second figure, in the design of the preferred embodiment of the present invention, The sector magnet 13 (which may also be the magnet receiving groove 122) is designed by determining the first opening angle θ 1 and the second opening angle θ 2 , and the first opening angle θ 1 corresponds to the sector arc S1 (fan arc S2) That is, the second arc 1221), the second opening angle θ 2 corresponds to the sector arc S2, and the sector arc S1 and the sector arc S2 both correspond to the same center C1 (ie, the first curvature shown in the third figure) Center C2).

In addition, please refer to the second diagram, the second diagram A and the second diagram B. The sector magnets 13 have a sector arc S2 corresponding to the second arc 1221, and the sector arc S2 corresponds to the center C1 ( In the first curvature The heart C2) has a certain opening angle (ie, the second opening angle θ 2 described above), and the fixed angle is one of 70 degrees to 100 degrees, and the angle of the horizontal axis in the figure is the angle of the second opening angle θ 2 . As can be easily seen from the figure, the different second opening angles θ 2 have different back electromotive force distortions and torque ripples, which can be selected in a practical manner to select a better angle, for example, ninety degrees.

In addition, referring to the third figure, in the design of the rotor 1 of the preferred embodiment of the present invention, after the first opening angle θ 1 and the second opening angle θ 2 of the sector magnet 13 are selected, the offset can be further utilized. The arc method is used to arc the rotor core 12 to form a first circular arc 1211 and a second circular arc 1221. Specifically, as shown in the third figure, the first arc 1211 corresponds to a first center of curvature C2, and the first arc 1211 has a first radius of curvature R1 corresponding to the first center of curvature C2, and the second arc The 1221 system has a second center of curvature C3, and the second center of curvature C3 is different from the first center of curvature C2. The second arc 1221 has a second radius of curvature R2 corresponding to the second center of curvature C3. In addition, the second radius of curvature R2 is a first radius of curvature R1 plus an offset R3, and the offset R3 is one of 0 mm to 10 mm, wherein the first arc 1211 is the second center of curvature C3 is a center of the arc-cutting, and is formed by cutting the arc along the arcuate path L with the second radius of curvature R2 as a radius. Therefore, the first circular arc 1211 is retracted in the direction of the rotating shaft 11 with respect to the second circular arc 1221.

Please refer to the third A diagram and the third B diagram. In the simulation results of the third A diagram and the third B diagram, the offset R3 is set to 0 mm (ie, no arcing) and 10 mm, and the curve 200 and Curve 400 represents a simulated curve with an offset R3 of 0 mm, while curve 300 and curve 500 It is a simulation curve indicating that the offset R3 is 10 mm. It can be clearly seen from the figure that if the arc is offset by the offset R3 of 0 mm, the performance of the back electromotive force or the torque chopping is worse than the arcing by the offset R3 of 10 mm. It can be seen that if the arc is cut by the offset R3 of 10 mm, the torque can be reduced by the average torque output.

In summary, according to the rotor 1 having the arc-cut structure provided by the present invention, the rotor core 12 has a plurality of core portions 121 and a plurality of magnet receiving grooves 122, and the arc portion corresponding to the core portion 121 Different from the arc corresponding to the magnet accommodating groove 122, and the magnet used in the rotor 1 is fan-shaped, the counter electromotive force can be effectively improved and the torque ripple can be reduced, thereby increasing the durability of the rotor. In addition, another effect of the present invention is that since each of the core portions 121 is coupled to each other, the mechanical structural strength can be increased, and thus it is suitable for high-speed use such as an air conditioner compressor motor, and the process can be simplified.

In addition, since the second circular arc 1221 is parallel to the circular arc outside the sector-shaped magnet 13, the magnetic force can be enhanced, and in the rotor 1 having the arc-cut structure, the silicon-steel sheet formed by the sector-shaped magnet 13 is completely circular, thereby being effective Improvement of the conventional technology, a plurality of silicon steel sheets are round in shape and have a lack of assembly and strength.

The features and spirit of the present invention will be more apparent from the detailed description of the preferred embodiments. On the contrary, the purpose is to cover various changes and equal arrangements in the present invention. Within the scope of the patent scope.

100‧‧‧Motor

200, 300, 400, 500‧‧‧ curves

1‧‧‧Rotor with arc-cut structure

11‧‧‧ shaft

12‧‧‧Rotor core

121‧‧‧ core

1211‧‧‧First arc

122‧‧‧Magnetic accommodating slot

1221‧‧‧Second arc

13‧‧‧fan magnet

14‧‧‧External connection

15‧‧‧Internal connection

2‧‧‧stator

C1‧‧‧ Center

C2‧‧‧First Curvature Center

C3‧‧‧ Second Curvature Center

R1‧‧‧first radius of curvature

R2‧‧‧second radius of curvature

R3‧‧‧ offset

S1‧‧‧ sector arc

S2‧‧‧ sector arc

L‧‧‧Arc path

θ 1‧‧‧ first corner

θ 2‧‧‧second corner

The first figure shows a schematic view of a rotor having a curved structure according to a preferred embodiment of the present invention; the second figure shows a schematic view of a sector magnet of a preferred embodiment of the present invention; and the second figure shows a sector of a preferred embodiment of the present invention. Schematic diagram of back electromotive force distortion simulation of magnet design; second diagram B shows a schematic diagram of torque chopping simulation of a fan magnet design according to a preferred embodiment of the present invention; and third diagram shows the first arc of the preferred embodiment of the present invention a second arc diagram; and a third A diagram showing a back electromotive force simulation of the first arc and the second arc of the preferred embodiment of the present invention; and a third B diagram showing the preferred embodiment of the present invention A schematic diagram of the torque simulation of an arc and a second arc.

100‧‧‧Motor

1‧‧‧Rotor with arc-cut structure

11‧‧‧ shaft

12‧‧‧Rotor core

121‧‧‧ core

1211‧‧‧First arc

122‧‧‧Magnetic accommodating slot

1221‧‧‧Second arc

13‧‧‧fan magnet

14‧‧‧External connection

15‧‧‧Internal connection

2‧‧‧stator

Claims (6)

A rotor having an arc-cutting structure is disposed in a stator of a motor and includes: a rotating shaft; a rotor core surrounding the rotating shaft, and comprising: a plurality of core portions integrally formed integrally with each other And having a first circular arc corresponding to a first center of curvature; and a plurality of magnet receiving slots, each of the magnet receiving slots being fan-shaped and opening in the core portions And corresponding to a second arc, the second arc is coupled to the first arc, and corresponding to a second center of curvature, and the second center of curvature is different from the first center of curvature; a plurality of fan-shaped magnets are correspondingly received in the magnet receiving slots; wherein each of the core portions is connected to each other by an outer connecting portion and an inner connecting portion, and each of the magnets is coupled to each other The groove is disposed between the outer connecting portion and the inner connecting portion, and the outer connecting portion corresponds to the second circular arc. The rotor having an arc-cut structure according to claim 1, wherein the first arc has a first radius of curvature corresponding to the first center of curvature, and the second arc corresponds to the second center of curvature There is a second radius of curvature which is the first radius of curvature plus an offset. The rotor having an arc-cut structure according to claim 2, wherein the offset is one of 0 mm to 10 mm. The rotor having a curved structure as described in claim 1, wherein the fan-shaped magnets have a sector arc corresponding to the second arc, the sector arc corresponding to the first center of curvature A certain angle is set, and the fixed angle is one of 70 degrees to 100 degrees. The rotor having an arc-cutting structure according to claim 1, wherein the rotor core is a silicon steel sheet, and the fan-shaped magnets are ferrite magnets. The rotor having an arc-cut structure according to claim 1, wherein each of the fan-shaped magnets is adjacent to the second arc adjacent to the outer edge of the stator.