TWI627819B - Rotor mechanism - Google Patents

Abstract

A motor rotor mechanism includes a plurality of rotor bars and a rotor body. The rotor bars are disposed on the rotor body. The rotor body has a plurality of reluctance holes and a plurality of reluctance tracks. Each magnetoresistive track extends from one of the rotor bars to the other of the rotor bars. The magnetic resistance holes are respectively arranged along the magnetic resistance track, each magnetic resistance hole is a magnetic flux barrier, and a magnetic circuit channel is formed between the adjacent two magnetic resistance holes.

Description

Motor rotor mechanism

The present invention relates to a motor rotor mechanism, and more particularly to a motor rotor mechanism that combines the advantages of synchronous and asynchronous motors.

The so-called electric motor is an electromagnetic actuating method for converting mechanical energy and electric energy. It is the most widely used product in daily life of various industries and people, for example, it can be used in machine tools, water pumps, light industrial machinery, wind power generation and hydraulic power. Power generation, etc., is one of the basic equipment necessary for industrial development, and is closely related to economic development.

Conventional motors are often used to increase efficiency through the choice of materials, the addition of more materials, or the use of electronic materials. Permanent magnets made of, for example, rare earth materials are widely used in synchronous machines. However, in recent years, energy conservation issues have received much attention, the price of rare earth materials has risen, and the control technology has matured. Research on reducing rare earth elements while improving motor efficiency has gradually become one of the key projects in the motor field. In this context, a synchronous reluctance motor that does not require the use of rare earth magnets has become a research trend, but it requires additional drivers and controllers to operate smoothly, which is a disadvantage of this type of motor.

Therefore, if the high-efficiency characteristics of the synchronous reluctance motor can be combined with the conventional asynchronous motor (induction motor) with superior structure such as direct start, high load and high reliability, the configuration of the driver can be eliminated. Competitive motor types.

In view of this, the present invention provides an electric motor rotor mechanism, which has the advantages of both synchronous and asynchronous motors. In addition to helping to reduce the size and cost of the motor, it can also achieve self-starting characteristics, increase the unit magnetic flux density of the motor, and output the output. Moment, improved motor efficiency and high load capacity.

An electric motor rotor mechanism according to the present invention includes a plurality of rotor bars and a rotor body. The rotor bars are disposed on the rotor body. The rotor body has a plurality of reluctance holes and a plurality of reluctance tracks. Each magnetoresistive track extends from one of the rotor bars to the other of the rotor bars. The magnetic resistance holes are respectively arranged along the magnetic resistance track, each magnetic resistance hole is a magnetic flux barrier, and a magnetic circuit channel is formed between the adjacent two magnetic resistance holes.

In the rotor mechanism of the motor disclosed in the present invention, since the rotor body has magnetoresistive holes arranged along the track of the magnetoresistance, the arrangement of the magnetoresistive holes forms a magnetic flux barrier and blocks the passage of the magnetic circuit when the motor is operated for a time. In order to compress the magnetic flux of the rotor before these reluctance tracks, thereby helping to increase the magnetic flux density of the overall rotor, thereby increasing the torque of the motor, and at the same time improving the efficiency of the motor. As time changes, the magnetic flux can pass through the magnetic path formed between the adjacent reluctance holes to maintain the smooth running of the motor, thereby helping to reduce the torque ripple of the motor.

In short, due to the proper arrangement of the magnetoresistive holes in the rotor body, the reluctance torque, the magnetic flux density and the like can be increased while the operation is smooth, so that the motor can follow the structure of the asynchronous motor, that is, the structure is simple. In addition to the advantage of reducing the overall volume, the overall unit flux can be increased by the magnetoresistive aperture, and the advantage of torque is increased, thereby improving the efficiency of the motor and additionally providing the advantage of high torque of the synchronous motor.

The above description of the disclosure and the following embodiments are intended to illustrate and explain the spirit and principles of the invention, and to provide further explanation of the scope of the invention.

1a‧‧‧Rotor mechanism

2‧‧‧stator

9‧‧‧Motor

10a, 10b, 10c, 10d‧‧‧ rotor body

10s‧‧‧ stomata

11, 12‧‧‧ end face

11s‧‧‧Axis hole

12s‧‧‧Rotor guide groove

13‧‧‧Magnetic resistance hole

15‧‧‧Auxiliary magnetoresistive structure

30‧‧‧Rotor bars

40‧‧‧End ring

A‧‧‧ area

B‧‧‧Area

C‧‧‧ area

R1, R2, R3, R4‧‧‧ magnetic resistance track

1 is a perspective view of a motor illustrated in accordance with an embodiment of the present invention.

Figure 2 is an exploded view of the motor of Figure 1.

Figure 3 is a front elevational view of the motor of Figure 1.

4 is a magnetic line and magnetic flux density analysis diagram of the motor of FIG. 1.

Figure 5 is a front elevational view of a rotor mechanism in accordance with another embodiment of the present invention.

Figure 6 is a front elevational view of a rotor mechanism in accordance with yet another embodiment of the present invention.

Figure 7 is a front elevational view of the rotor mechanism in accordance with yet another embodiment of the present invention.

The detailed features and advantages of the present invention are described in detail in the embodiments of the present invention. The related objects and advantages of the present invention will be readily understood by those skilled in the art. The following examples are intended to describe the present invention in further detail, but are not intended to limit the scope of the invention.

In addition, the embodiments of the present invention are disclosed in the following drawings, and for the sake of clarity, the details of the invention are described in the following description. However, it should be understood that these practical details are not intended to limit the invention. In addition, for the sake of simplicity of the drawings, some conventional structures and components will be illustrated in a simplified schematic manner, and even some of the drawings omits the structure of cables (cables, or cables). In order to keep the picture clean and tidy, declare it first.

Furthermore, unless otherwise defined, all terms used herein, including technical and scientific terms, have their ordinary meaning, and their meaning is understood by those skilled in the art. Furthermore, the definition of the above vocabulary should be interpreted in the present specification as having the same meaning as the technical field related to the present invention. Unless specifically defined, these terms are not to be construed as too idealistic or formal.

1 to 2, FIG. 1 is a perspective view of a motor according to an embodiment of the present invention, and FIG. 2 is an exploded view of the motor of FIG. 1.

The invention proposes a rotor mechanism 1a suitable for use in a motor 9. The motor 9 has a stator 2, an end ring 40, and the like. The rotor mechanism 1a is rotatably located inside the stator 2. The two end ring 40 is located at opposite end faces 11, 12 of the rotor mechanism 1a. However, the invention is not limited to the stator 2, the end ring 40 or its structure.

Hereinafter, the rotor mechanism 1a will be described. Please refer to Figure 3, Figure 3 It is a front view of the motor of Figure 1. The rotor mechanism 1a includes a rotor body 10a and a plurality of rotor bars 30. The rotor body 10a, which may also be referred to as a rotor core, may be, but is not limited to, a structure composed of a plurality of stacks of silicon steel sheets. Further, the rotor body 10a can be transmitted through a skewed slot technique to improve motor starting characteristics and reduce excitation noise.

Further, the rotor body 10a has a shaft hole 11s and a plurality of rotor bar grooves (also referred to as rotor grooves) 12s. The shaft hole 11s penetrates the rotor body 10a and is located on the center line of the rotor body 10a, and may be provided with a shaft to transmit and output the rotational driving force of the rotor mechanism 1a. However, the shaft is optional, and the present invention is not This is limited. Further, in the present embodiment or other embodiments, the shaft hole 11s may also maintain a clearance and output the rotational driving force in other configurations.

In the present embodiment, the rotor bar groove 12s penetrates the rotor body 10a and surrounds the shaft hole 11s, but is positioned closer to the side of the rotor body 10a, and the rotor bars 30 are respectively disposed in the rotor bar groove 12s. It should be noted that although the position of the rotor guide groove 12s of the present embodiment is arranged close to the side of the rotor body 10a, the present invention is not limited thereto. For example, in other embodiments, the position of the rotor bar groove 12s may be closer to the shaft hole 11s, that is, the position of the rotor bar 30 is closer to the shaft hole 11s.

Next, it should be noted that in the present embodiment, the rotor body 10a further has a plurality of magnetoresistive traces R1 and a plurality of magnetoresistive apertures 13, but it should be stated that for the purpose of simplicity of the drawing, FIG. 3 only A magnetoresistive track R1 is shown.

Specifically, the reluctance track R1 is located in the rotor yoke space (not numbered) between the rotor bar 30 and the shaft hole 11s, and each magnetoresistive track R1 extends from one of the rotor bars 30 to the other rotor. The guide bar 30, that is, the two ends of the single reluctance track R1 are respectively located on the two different rotor bars 30, but the two rotor bars are located at the two ends of the single reluctance track R1, which is not limited by the present invention. . In addition, in this embodiment or other embodiments, each of the magnetoresistive traces R1 is at least interleaved with the other two magnetoresistive traces R1. As shown in FIG. 3, the rotor body 10a has seven magnetoresistive traces R1, which can be used to Magnetic lines of force pass smoothly in front of these tracks.

In more detail, as shown in Figures 2 to 3, each magnetoresistive track R1 is at least partially The area A of the orthographic projection in which one end ring 40 is projected to one of the end faces 11 of the rotor body 10a overlaps.

The reluctor holes 13 are arranged along the magnetoresistive track R1 and are not connected to each other. When the motor is running, each of the reluctance holes 13 may be a flux barrier, and the magnetic lines of force cannot pass, but between the adjacent two reluctance holes 13, a magnetic path can be formed when the slip characteristic is generated. Let the magnetic lines pass. In addition, in the embodiment or other embodiments, the plurality of reluctance holes 13 on the single magnetoresistive track R1 are kept at equal intervals, but the invention is not limited thereto. For example, in other embodiments, the plurality of magnetoresistive apertures 13 on the single magnetoresistive trace R1 may maintain an unequal pitch or an arrangement of unequal pitches of partially equidistant portions.

In addition, in this embodiment or other embodiments, the cross-sectional shape of each of the magnetoresistive apertures 13 is circular, but the invention is not limited thereto. For example, in some embodiments, the cross-sectional shape of the magnetoresistive aperture 13 may also be any shape, such as an elliptical shape or a polygonal shape.

Further, in this embodiment or other embodiments, the ratio of the spacing of the adjacent two reluctance holes 13 to the outer diameter of each of the reluctance holes 13 is less than about 3 according to actual requirements.

In addition, in this embodiment, the cross-sectional area of the magnetoresistive hole 13 is at least smaller than the cross-sectional area of the rotor bar 30, but the invention is not limited thereto. For example, in other embodiments, the cross-sectional area of the reluctor hole may also be larger than the cross-sectional area of the rotor bar or larger than the cross-sectional area of the rotor slot accommodating the rotor bar.

Furthermore, in the embodiment or other embodiments, the magnetoresistive holes 13 are filled with a medium, for example, a metal material such as gold or aluminum, which can be used to increase the effect of the magnetism. However, the present invention is not limited to the type of material of the medium filled in the magnetoresistive hole 13, and the medium is optional. In principle, as long as the magnetic permeability in the magnetic resistance hole 13 is kept lower than the magnetic permeability of the rotor body 10a. For example, in some embodiments, the reluctance hole 13 may also remain clear and only air is present.

Next, in FIG. 3, in the embodiment or other embodiments, the rotor body 10a further has a plurality of air holes 10s adjacent to the shaft hole 11s. Specifically, the air hole 10s is a bit In the area B of the inner ring of the end ring 40. Further, the purpose of the air holes 10s is to reduce the moment of inertia of the rotor body 10a or to increase the heat dissipation effect.

According to the above design, when the motor is in operation, the rotor mechanism 1a is mounted in the stator 2 of the motor 9 to form the basic structure of the motor, but the difference is that the rotor body 10a is arranged along the magnetoresistive track R1. The reluctance holes 13 are arranged to form a flux barrier to block the passage of magnetic flux to compress the magnetic flux of the rotor mechanism 1a before the reluctance tracks R1, thereby contributing to the magnetic reluctance holes 13 Increase the flux density (Flux Density) and reluctance torque of the overall motor. For example, please refer to FIG. 4. FIG. 4 is a magnetic line and magnetic flux density analysis diagram of the motor of FIG. It can be seen from the figure that in a certain time interval, the magnetic lines of force passing through the rotor body are concentratedly distributed on the front side of the magnetoresistive track (for example, the area C), that is, between the magnetoresistive track and the outer edge of the rotor, so that the area C The magnetic flux density increases (as shown, the B value of the region C falls within the range of 1.1111e+000 to 8.8889e-001 Tesla). Moreover, according to the experimental comparison data, the magnetic flux density of the region C is increased by about 176.2% compared with the same region of the conventional rotor, and the motor torque can be effectively increased by more than 15%, thereby contributing to the motor improvement. effectiveness. Then, as time passes, since the adjacent magnetoresistive holes 13 are not connected, an appropriate distance is maintained to form a magnetic path passage when the slip characteristics are generated, and the magnetic flux can pass through the magnetic path. That is to say, when the rotor body 10a and the stator 2 produce slip characteristics, the magnetic circuit can pass through the magnetic path between the adjacent magnetoresistive holes 13 to maintain smooth operation, thereby helping to reduce the rotation of the motor. Torque Ripple.

In short, the proper arrangement of the reluctance holes 13 in the rotor body 10a can increase the reluctance torque, the magnetic flux density and the like while keeping the operation smooth, so that the motor 9 can follow the structure of the asynchronous motor, that is, The utility model has the advantages of simple structure, helps to reduce the overall volume, and can increase the overall magnetic energy by the magnetoresistive hole 13 to increase the torque, thereby improving the efficiency of the motor, and additionally having the advantage of high torque of the synchronous motor. .

Further, the rotor mechanism 1a of the present invention does not require a magnet, so that there is no permanent magnet auxiliary synchronous motor using a magnet to increase the material cost, and high temperature degaussing due to the use of the magnet. And other issues. In contrast, the rotor mechanism of the present invention can be applied in a wide range and has a high load capacity.

In addition, in the foregoing embodiment, the arrangement of each magnetoresistive track R1 is at least interleaved with the other two magnetoresistive tracks R1, but the invention is not limited thereto. For example, please refer to FIG. 5, which is a front view of a rotor mechanism according to another embodiment of the present invention. This embodiment proposes a rotor mechanism 1b which is different from the rotor mechanism 1a of the foregoing embodiment in that the magnetoresistive trajectories R2 of the rotor body 10b of the rotor mechanism 1b are not staggered with each other. Therefore, it can be understood that the present invention is not limited to the number of the reluctance track R1, and the user can increase or decrease the quantity according to actual needs.

Next, please refer to FIG. 6, which is a front view of a rotor mechanism according to still another embodiment of the present invention. This embodiment provides a rotor mechanism 1c which is different from the rotor mechanism of the foregoing embodiment in that the rotor body 10c of the rotor mechanism 1c further has a plurality of auxiliary magnetoresistive structures 15 located in the magnetoresistive track R3 and the shaft hole 11s. The shape is matched to the magnetoresistive track R3 to form a multilayered magnetic barrier to increase the magnetic flux density. In addition, although in the present embodiment, each of the auxiliary reluctance structures 15 is a strip-shaped trench, the invention is not limited thereto. For example, in other embodiments, each of the auxiliary magnetoresistive structures may also be formed of a plurality of arrangements similar to the magnetoresistive apertures 13 of the first embodiment.

Next, please refer to FIG. 7, which is a front view of a rotor mechanism according to still another embodiment of the present invention. The present embodiment provides a rotor mechanism 1d which is different from the rotor mechanism of the foregoing embodiment in that each of the magnetic group trajectories in the foregoing embodiment is a line having a fulcrum, but the invention is not limited thereto. For example, in the present embodiment, each magnetoresistive track R4 of the rotor body 10d of the rotor mechanism 1d is an arc. Therefore, it can be inferred from the changes of the foregoing embodiments that in some embodiments, each magnetoresistive track can also be adjusted to a plurality of straight lines, that is, a plurality of line segments whose curvature changes to zero, or a curve having a curvature, according to actual needs. The trajectory formed is not limited to this invention.

From the above, the present invention proposes an innovative rotor mechanism that achieves synchronization The advantages of coupling motor and asynchronous motor can further achieve self-starting characteristics, increase the reluctance torque of the motor, flux density, reduce motor volume, reduce cost, improve motor efficiency and high load capacity, etc., and hope to become the future motor market. New topics and new motor types.

Although the present invention has been disclosed above in the foregoing embodiments, it is not intended to limit the invention. It is within the scope of the invention to be modified and modified without departing from the spirit and scope of the invention. Please refer to the attached patent application for the scope of protection defined by the present invention.

Claims (11)

An electric motor rotor mechanism comprising: a plurality of rotor bars; and a rotor body, wherein the rotor bars are disposed on the rotor body, the rotor body having a plurality of magnetoresistive tracks and a plurality of magnetoresistive holes, each of the magnets The resisting track extends from one of the rotor bars to the other of the rotor bars, and the magnetoresistive holes are respectively arranged along the track of the magnetoresistance, each of the magnetoresistive holes being a flux barrier and adjacent two A magnetic path channel is formed between the magnetoresistive holes, wherein each of the magnetoresistive holes is filled with a medium having a lower magnetic permeability than the rotor body. The motor rotor mechanism of claim 1, wherein a ratio of a pitch of adjacent two of the magnetoresistive holes to an outer diameter of each of the magnetoresistive holes is less than 3. The motor rotor mechanism of claim 1, wherein the magnetoresistive apertures are equally spaced between each of the magnetoresistive tracks. The motor rotor mechanism of claim 1, wherein the reluctance holes are not equally spaced between each of the reluctance tracks. The motor rotor mechanism of claim 1, wherein the reluctance tracks are not staggered with each other. The motor rotor mechanism of claim 1, wherein each of the magnetoresistive traces is at least interleaved with the other of the magnetoresistive traces. The motor rotor mechanism of claim 1, wherein each of the magnetoresistive traces is an arc. The motor rotor mechanism of claim 1, wherein the curvature of each of the magnetoresistive tracks changes to zero. The motor rotor mechanism of claim 1, further comprising a two-end ring disposed on opposite end faces of the rotor body, each of the magnetoresistive traces being at least partially projected with one of the end rings to one of the rotor bodies The orthographic projections of the end faces overlap. The motor rotor mechanism of claim 1, wherein the rotor body further has a shaft hole and a plurality of air holes, the air holes surrounding the shaft hole. The motor rotor mechanism of claim 9, wherein the rotor body further has a plurality of air holes, wherein the air holes are located in a region of the inner ring of the end rings.