TW202118195A - Rotor structure of permanent magnetism motor - Google Patents

Abstract

The present invention provides a rotor structure of permanent magnetism motor, of which the main technical feature is that the magnets the rotor which are distributed according to Halbach array, and a ratio of a distance between the magnets of the parallel array and the outer ring edge of the rotor to a inner and outer diameter difference of the annular rotor is between 0.43~ 0.48.

Description

Permanent magnet motor rotor structure

The present invention relates to motors, and particularly relates to a permanent magnet motor rotor structure.

Although the technological development of motor devices using electromagnetic technology has reached maturity, the development of improvements such as how to enhance its performance and reduce energy consumption has never stopped. Among them, the Halback magnetic ring array has been developed since the 20th century. Since Klaus Halback revealed, its special magnet arrangement compared to the traditional magnet arrangement can greatly reduce the motor's stall torque and ripple torque effect, and further improve the motor's vibration and noise problems. And its magnetic self-shielding feature can also reduce the magnetic leakage phenomenon of the motor and reduce the electromagnetic interference of the motor to the external environment. It is obvious that it can be used to enhance the performance of the motor.

However, the research on the Halbach magnetic ring array is still relatively lacking in the published prior art.

Therefore, the main purpose of the present invention is to provide a rotor structure of a permanent magnet motor, which can increase the torque of the motor, reduce magnetic flux leakage and reduce iron loss.

The reason is that, in order to achieve the above-mentioned object, the main technical feature of the permanent magnet motor rotor structure provided by the present invention is that the magnets arranged in the ring rotor according to the Halbach magnetic ring array are located between the magnets in the parallel array and The distance between the outer edge of the rotor and the difference between the inner and outer diameters of the annular rotor, the ratio of the distance/the difference between the inner and outer diameters is between 0.43 and 0.48.

Wherein, the ratio of the distance/the difference between the inner and outer diameters is preferably between 0.44 and 0.46.

Among them, the magnet strength of the parallel array in the Halbach magnetic ring array is less than the magnet strength of the radial array in the Halbach magnetic ring array.

First of all, please refer to Figures 1 and 2. The rotor structure (10) of the permanent magnet motor provided in a preferred embodiment of the present invention mainly includes a rotor (20) and a plurality of first magnets ( 30) With the majority of the second magnet (40).

The rotor (20) has a body (21) in the shape of a circular ring, and most of the first grooves (22) with a rectangular section are drawn from the outer ring edge of the body (21) to the inner edge of the body (21) It extends a first length (L1) in the radial direction, and most of the second grooves (23) with a rectangular cross-section are respectively provided in the body (21) and between two adjacent first grooves (22) And make the long axis of each of the second grooves (23) perpendicular to the radial direction of the body, so that each of the first grooves (22) and each of the second grooves (23) are in the body ( 21) Form a crisscross arrangement state;

In addition, the rotor (20) further includes a plurality of sheet-like supports (24) which are respectively protrudingly arranged on the extension ends of the first grooves (22), and move toward each other along the radial direction of the body (21). The notch direction of the first groove (22) extends a second length (L2) shorter than the first length, and most pairs of recesses (25) are respectively recessed on the long axis of each second groove (23) The two ends are located at the corner positions on one side of the short axis and are perpendicular to the long axis of each second groove (23).

Each of the first magnets (30) is in the shape of a rectangular block, and is inserted into each of the first grooves (22) so that one end of the long axis abuts against the extension end of the corresponding support body (24), and Make the length of each first magnet (30) shorter than the difference between the first length (L1) and the second length (L2), so that the other end of the long axis of each first magnet (30) can be submerged It is inside the notch of each first groove (22), and does not protrude outside the outer ring side of the body (21).

Each of the second magnets (40) is in the shape of a rectangular block, and the magnetic intensity is less than that of each of the first magnets (30). Each of the second magnets (40) is embedded in each of the second grooves (23), and each of the The rectangular shape of the two magnets (40) is the same as the rectangular shape of each of the second grooves (23), so that each of the second magnets (40) can be firmly embedded in each of the second grooves (23) .

Each of the first magnets (30) and each of the second magnets (40) are arranged in a Halbach magnetic ring array, wherein each of the first magnets (30) arranged in a radial pattern is a radial array, and Each of the second magnets (40) arranged along the circumferential direction of the body (21) is a parallel array, and further, in a parallel array, each of the second magnets (40) is away from the body ( 21) The distance (α) between one end of the center of curvature and the outer ring surface of the body (21), and the diameter difference (β) between the inner and outer diameters of the body (21), there is a specific relationship between the two The proportional relationship exists. As shown in Figure 3, the value of the spacing (α)/the diameter difference (β) is between 0.43 and 0.48, which can increase torque (T), reduce iron loss (CL) and stall rotation. The effect of (CG) appears. Although the optimal ratio varies depending on different needs, in general, the ratio between 0.44 and 0.46 should be better, but it is not limited, for example, by converting For the purpose of increasing the moment, the α/β value is 0.45 as the best value. At this time, the magnetic flux density and magnetic circuit diagrams are shown in Figures 4 and 5, but if the purpose is to reduce the stall, then α The value of /β is 0.48 as the best, and the magnetic flux density at this time is shown in Figure 6.

From the perspective of efficiency, please refer to the comparison diagrams of Figures 7 and 8. In the two figures, the solid line represents the present invention and the dotted line represents the conventional technology. It can be seen from the magnetic leakage comparison diagram of Figure 7. The rotor structure (10) of the permanent magnet motor has a significant effect on the blocking effect of magnetic flux leakage compared with the conventional technologies, and can improve the output power and efficiency of the motor, and the performance comparison chart in Fig. 8 is also sufficient to prove , The rotor structure (10) of the permanent magnet motor has better performance than the conventional technologies. According to this, it is sufficient to prove that the technology provided by the present invention can be used in the motor compared with the conventional technologies. There is a significant improvement in the effect of increasing torque, reducing magnetic flux leakage and reducing iron loss.

(10): Rotor structure of permanent magnet motor (20): Rotor (21): Body (22): The first slot (23): Second slot (24): Support (25): Alcove (30): The first magnet (40): The second magnet (L1): first length (L2): second length (α): spacing (β): Diameter difference (T): Torque (CL): iron loss (CG): Pause

Figure 1 is a plan view of a preferred embodiment of the present invention. FIG. 2 is a partial enlarged view of a preferred embodiment of the present invention along the area A in FIG. 1. FIG. Fig. 3 is a graph of torque, iron loss and jog rotation for different α/β values in a preferred embodiment of the present invention. Figure 4 is a diagram of the magnetic flux density with an α/β value of 0.45 in a preferred embodiment of the present invention. Figure 5 is a magnetic circuit diagram of a preferred embodiment of the present invention with an α/β value of 0.45. Fig. 6 is a magnetic flux density diagram with an α/β value of 0.48 in a preferred embodiment of the present invention. FIG. 7 is a comparison diagram of magnetic leakage between a preferred embodiment of the present invention and the conventional technology. FIG. 8 is a performance comparison diagram between a preferred embodiment of the present invention and the conventional technology.

(21): Body

(22): The first slot

(23): Second slot

(24): Support

(25): Alcove

(30): The first magnet

(40): The second magnet

(L1): first length

(L2): second length

(α): spacing

(β): Diameter difference

Claims (8)

A rotor structure of a permanent magnet motor, including: A rotor with an annular body, a plurality of first grooves are spaced apart from each other and radially provided on the body along the radial direction of the body, and a plurality of second grooves are respectively interposed therebetween. Between adjacent first grooves and arranged along the circumference of the body; Most of the first magnets are respectively embedded in each of the first grooves; Most of the second magnets are respectively embedded in each of the second grooves; Wherein, the distance between the side of each second magnet away from the center of curvature of the body and the outer ring edge of the body, and the diameter difference between the inner diameter and the outer diameter of the body, make the distance /The value of the diameter difference is between 0.43 and 0.48. The rotor structure of the permanent magnet motor according to claim 1, wherein the value of the pitch/the diameter difference is between 0.44 and 0.46. The rotor structure of the permanent magnet motor according to claim 1 or 2, wherein each of the first magnet and each of the second magnets are rectangular, and the long axis of each of the first magnets is parallel to the radial direction of the body , The long axis of each second magnet is perpendicular to the radial direction of the body. The rotor structure of the permanent magnet motor described in 2 or 3, wherein the magnetic intensity of each of the second magnets is smaller than the magnetic intensity of each of the first magnets. The rotor structure of the permanent magnet motor according to claim 3, wherein each of the second slots has the same rectangular shape as the second magnet. The rotor structure of the permanent magnet motor according to claim 5, wherein the rotor system further includes a plurality of recesses, which are respectively recessed on both ends of one side of the minor axis of the second slot, and are perpendicular to each of the The long axis of the second slot. The rotor structure of the permanent magnet motor according to claim 3, wherein each of the first grooves respectively extends from the outer ring surface of the body inward, and has a rectangular shape with a length greater than that of each of the first magnets. The rotor structure of the permanent magnet motor according to claim 7, wherein the rotor further includes a plurality of support bodies, which are respectively protruded at the extension ends of the first grooves and extend outward along the radial direction of the body, and The extension length of each support body is smaller than the difference between the length of each first groove and the length of each first magnet.

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