TWI792848B - Rotor structure with suppress harmonic structure - Google Patents

Abstract

A rotor structure with suppress harmonic structure includes a rotor structure body and a plurality of magnets. The rotor structure body is provided with a plurality of magnet setting areas around a circle center, each magnet setting area has a central axis, and a rotor outer edge of the rotor structure body has a plurality of main notches, a plurality of first auxiliary notches and a plurality of second auxiliary notches. Each main notch intersects the central axis of each magnet setting area, and each first auxiliary notch and each second auxiliary notch are respectively located on both sides of each main notch. The magnets are respectively fixed to the first magnet slot and the second magnet slot of the magnet installation area.

Description

Rotor with harmonic suppression structure

The present invention relates to a rotor structure, in particular to a rotor with a harmonic suppression structure.

Please refer to the first figure and the second figure, the first figure is a schematic plan view showing the structure of the prior art permanent magnet motor; the second figure is an enlarged schematic diagram of the first circle A. As shown in the first and second figures, a permanent magnet motor structure PA100 includes a stator structure PA1 and a rotor structure PA2, the rotor structure PA2 is arranged in the stator structure PA1, and the rotor structure PA2 includes a rotor structure body PA21 and a rotor structure PA21. A plurality of magnets PA22, and a plurality of magnets PA22 are respectively fixed in a plurality of magnet setting holes (not shown in the figure) of the rotor structure body PA21; among them, a plurality of magnets PA22 are arranged in a V shape to make magnets of the same polarity PA22 has the effect of collecting magnetism, so as to effectively enhance the magnetic force.

For the V-shaped configuration adopted by the above-mentioned magnet PA22, please continue to refer to the third figure. The third figure is a three-dimensional schematic diagram showing a permanent magnet motor of the prior art. As shown in the third figure, a permanent magnet motor rotor PA200 has a first end face PA201 and a second end face PA202 oppositely arranged, and the permanent magnet motor rotor PA200 is provided with a plurality of magnets (only the magnets PA300, PA400, PA500 and PA600), and these magnets PA300, PA400, PA500 and PA600 are also arranged in the V-shaped configuration as mentioned above; among them, the first end PA301 of the magnet PA300 and the first end PA401 of the magnet PA400 are magnetically the same and the first end PA501 of the magnet PA500 and the first end PA601 of the magnet PA600 are also magnetically identical, but the magnetic poles of the magnets PA500 and PA600 are opposite to those of the magnets PA300 and PA400.

For example, the magnetic poles of the first terminals PA301 and PA401 are S poles, while the second terminals PA302 and PA402 are both N poles; on the contrary, the magnetic poles of the first terminals PA501 and PA601 are N poles, and the second terminals Both PA502 and PA602 are S poles. It can be seen that the V-shaped configuration method adopted by the existing permanent magnet motor rotor PA200 is to regard the magnets PA300 and PA400 as one group, and the magnets PA500 and PA600 as another group, and then the magnetic pole directions of the two groups are opposite, and then The magnets of the entire permanent magnet motor rotor PA200 (including PA300, PA400, PA500 and PA600) are arranged alternately in a set of N poles and a set of S poles.

As mentioned above, although the existing permanent magnet motor can increase the magnetic force through the V-shaped arrangement of magnets, when the permanent magnet motor operates, the magnetic poles of the coils on the stator and the magnetic poles of the magnets on the rotor correspond to mutual attraction. At this time, the magnetic attraction between the two will resist the rotation of the rotor, thereby causing a cogging torque (Cogging Torque) that affects the rotation of the rotor.

In view of the prior art, in order to concentrate the magnetic force of the rotor magnet, the existing permanent magnet synchronous motor usually adopts a V-shaped arrangement. Therefore, when the rotor rotates, it is easy to cause the magnetic pole of the magnet and the magnetic pole of the stator coil. The phenomenon of cogging torque generated when the rotor rotates due to mutual attraction; therefore, the main purpose of the present invention is to provide a rotor structure that can reduce the cogging torque generated when the rotor rotates through structural improvement.

In order to solve the problems of the prior art, the necessary technical means adopted by the present invention is to provide a rotor with a harmonic suppression structure, which includes a rotor structure body and a plurality of magnets.

Rotor Structure The system is provided with a plurality of magnet installation areas around a center of a circle, each magnet installation area is provided with a first magnet slot and a second magnet slot, and the first magnet slot and the second magnet slot are symmetrical about one and extend to the center of the circle The central axis extends obliquely, the first outer end of the first magnet groove and the second outer end of the second magnet groove are adjacent to the central axis and the rotor outer edge of the rotor structural body, one of the first magnet grooves The first inner end and the second inner end of the second magnet groove are far away from the central axis and the outer edge of the rotor, and the outer edge of the rotor is provided with a plurality of main notches, a plurality of first auxiliary notches and a plurality of second auxiliary notches, The center of each main notch intersects with the central axis of each magnet setting area, and each first auxiliary notch and each second auxiliary notch are respectively located on both sides of each main notch.

A plurality of magnets are respectively fixed in the first magnet groove and the second magnet groove of the magnet installation area.

In a subsidiary technical means derived from the above necessary technical means, each first auxiliary notch includes a first outer round corner adjacent to the central axis, a second outer round corner far away from the central axis, and a first outer round corner located on the first outer round corner. The fillet between the corner and the second bull fillet.

Preferably, the radius of curvature of the first outer fillet is 0.3 mm, the radius of curvature of the second outer fillet is 5 mm, and the radius of curvature of the inner fillet is 1 mm.

In addition, there is a first extension section between the first round corner and the inner corner, a second extension section between the second outer corner and the inner corner, and a second extension section between the first extension section and the second extension section. An included angle, the included angle is 83 degrees.

In one of the subsidiary technical means derived from the above-mentioned necessary technical means, each main notch includes a central fillet and two outer fillets, the central axis passes through the central fillet, and the two outer fillets are located at the central guide fillet. Both sides of the fillet.

Preferably, the radius of curvature of the central fillet is 5 mm, and the radius of curvature of the two outer fillets is 5 mm. Each main notch further includes two straight line extensions, and the two straight line extensions are respectively extended from the center fillet to two Outer fillet.

In addition, there is a notch opening angle between the two straight line extensions, and the notch opening angle is between 50 degrees and 70 degrees; wherein, the notch opening angle is preferably 62 degrees.

As mentioned above, since the rotor with harmonic suppression structure of the present invention is provided with a plurality of main notches, a plurality of first auxiliary notches and a plurality of second auxiliary notches on the outer edge of the rotor, when the rotor structure is in operation, it is set at the first The magnetic field of the magnets in the first magnet slot and the second magnet slot can be more effectively extended to the stator, so that the cogging torque of the rotor structure can be significantly reduced, and then the permanent magnet motor can be used after using the rotor structure of the present invention. It can effectively increase the operating efficiency.

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

Please refer to Figures 4 and 5. Figure 4 shows a schematic plan view of a rotor with a harmonic suppression structure provided in a preferred embodiment of the present invention provided in a stator; Figure 5 is an enlargement of circle B of the fourth picture schematic diagram. As shown in the fourth and fifth figures, a rotor 100 with a harmonic suppression structure is used to be arranged in a stator 200, and the rotor 100 with a harmonic suppression structure includes a rotor structure body 1 and a plurality of magnets 2 (Only one is marked in the picture). In practical application, the rotor 100 with the harmonic suppression structure is rotatably disposed in the stator 200 through a rotating shaft (not shown in the figure).

The rotor structure body 1 has a rotor inner edge 11 and a rotor outer edge 12 that are oppositely arranged inside and outside. Both the rotor inner edge 11 and the rotor outer edge 12 extend around a center CC, that is, the rotor inner edge 11 and the rotor outer edge 12 For concentric circles. In addition, the rotor structural body 1 is provided with twelve magnet setting areas 13 (only one is marked in the figure) between the rotor inner edge 11 and the rotor outer edge 12, and the magnet setting areas 13 are arranged around the center CC of the circle. And each magnet installation area 13 defines a first magnet groove 131 and a second magnet groove 132 .

Based on the above, the first magnet groove 131 and the second magnet groove 132 are symmetrical to a central axis X extending to the center of the circle CC and extend obliquely; wherein, the first magnet groove 131 has a first outer end 1311 opposite to each other. Similar to a first inner end 1312, the second magnet slot 132 also has a second outer end 1321 and a second inner end 1322 oppositely arranged, and the first outer end 1311 and the second outer end 1321 are adjacent to The central axis X and the rotor outer edge 12 , and the first inner end 1312 and the second inner end 1322 are far away from the central axis X and the rotor outer edge 12 .

In addition, the outer edge of the rotor 12 defines a main notch 121 (only one is marked in the figure), a first auxiliary notch 122 (only one is marked in the figure) and a second auxiliary notch 123 (only one is marked in the figure) in each magnet setting area 13 . Only one is marked), so the outer edge of the rotor 12 actually has twelve main notches 121 , twelve first auxiliary notches 122 and twelve second auxiliary notches 123 .

Each main notch 121 has a central rounded corner 1211, two outer rounded corners 1212 and 1213, and two linear extensions 1214 and 1215, and the central axis X of each magnet setting area 13 passes through each main notch respectively. The central fillet 1211 of the notch 121, the two outer fillets 1212 and 1213 are symmetrical to the central axis X and are respectively located on both sides of the central axis X, and the two straight line extensions 1214 and 1215 are two sides of the central fillet 1211. The sides are formed by extending toward the two outer fillets 1212 and 1213 respectively. In addition, in each magnet setting area 13 , the first auxiliary notch 122 and the second auxiliary notch 123 are respectively located on two sides of the main notch 121 .

In this embodiment, the radius of curvature of the central rounded corner 1211 and the two outer rounded corners 1212 and 1213 is 5mm, and there is a notch opening angle (not shown) between the two straight line extensions 1214 and 1215, and the notch The opening angle in this embodiment is 62 degrees, but it is not limited thereto. In other embodiments, the opening angle of the notch can also be between 50 degrees and 70 degrees.

A plurality of magnets 2 are respectively fixed in the first magnet groove 131 and the second magnet groove 132 of each magnet installation area 13 . Wherein, the arrangement of the magnetic poles of the magnet 2 please refer to the third figure and the description of the prior art, and no further details are given here.

Please continue to refer to the sixth figure, which is an enlarged schematic diagram of circle C in the fifth figure. As shown in the fourth figure to the sixth figure, each first auxiliary notch 122 includes a first outer fillet 1221 adjacent to the central axis X, a second outer fillet 1222 away from the central axis X, and a first outer fillet 1222 located at the first The inner fillet 1223 between the outer fillet 1221 and the second outer fillet 1222; wherein, the radius of curvature of the first outer fillet 1221 is 0.3 mm, the radius of curvature of the second outer fillet 1222 is 5 mm, and the inner fillet 1223 The radius of curvature is 1mm. In addition, the inner fillet 1223 also has a first extension 12231 extending to the first outer fillet 1221 and a second extension 12232 extending to the second outer fillet 1222, the first extension 12231 and the second extension There is an included angle (not shown in the figure) between 12232, and the included angle is 83 degrees.

Similarly, each second auxiliary notch 123 includes a first outer fillet 1231 adjacent to the central axis X, a second outer fillet 1232 away from the central axis X, and a second outer fillet 1231 between the first outer fillet 1231 and the second outer fillet. The inner fillet 1233 between the rounded corners 1232; wherein, the radius of curvature of the first outer fillet 1231 is 0.3 mm, the radius of curvature of the second outer fillet 1232 is 5 mm, and the radius of curvature of the inner fillet 1233 is 1 mm. In addition, the inner fillet 1233 also has a first extension 12331 extending to the first outer fillet 1231 and a second extension 12332 extending to the second outer fillet 1232, the first extension 12331 and the second extension There is an included angle (not shown in the figure) between 12332, and the included angle is 83 degrees.

It should be noted that the restrictions on the radius of curvature and angle of the main notch 121, the first auxiliary notch 122 or the second auxiliary notch 123 shown in the fourth figure to the sixth figure are only schematic displays, and are actually based on the instructions. The parameters restricted in are the main ones.

Please continue to refer to the seventh figure. The seventh figure is a schematic diagram showing the torque change curves measured during operation of the permanent magnet motor made with the rotor structure of the present invention and the permanent magnet motor of the prior art. As shown in the first figure, the second figure, the fourth figure to the seventh figure, the permanent magnet motor made of the permanent magnet motor structure PA100 of the prior art has a curve of torque change as a curve TC, while using the present invention The torque change curve of the permanent magnet motor made of the rotor 100 with the harmonic suppression structure is a curve IC.

From the curves TC and IC in Figure 7, it can be seen that the permanent magnet motor made of the rotor 100 with harmonic suppression structure provided by the present invention has significantly smaller torque variation during operation than the permanent magnet motor structure using the prior art The magnitude of the torque change of the permanent magnet motor made of PA100 relatively shows that the rotor 100 with harmonic suppression structure of the present invention can indeed make the The cogging torque of the rotor 100 with the harmonic suppression structure is reduced during operation.

To sum up, compared with the problem that the permanent magnet motor of the prior art is prone to generate cogging torque, the rotor with harmonic suppression structure of the present invention has a plurality of main gaps and a plurality of first The auxiliary notch and the plurality of second auxiliary notches, when the rotor structure is in operation, the magnetic field of the magnet set in the first magnet slot and the second magnet slot can be more effectively extended to the stator, so that the cogging torque of the rotor structure can be reduced when the rotor structure is in operation. It can be significantly reduced, so that the permanent magnet motor can effectively increase the operating efficiency after using the rotor with the harmonic suppression structure of the present invention.

Through the above detailed description of the preferred embodiments, it is hoped that the characteristics and spirit of the present invention can be described more clearly, and the scope of the present invention is not limited by the preferred embodiments disclosed above. On the contrary, the intention is to cover various changes and equivalent arrangements within the scope of the patent application for the present invention.

PA100: Permanent magnet motor structure PA1: stator structure PA2: rotor structure PA21: rotor structure body PA22: magnet PA200: permanent magnet motor rotor PA201: the first end face PA202: Second end face PA300, PA400, PA500, PA600: magnet PA301, PA401, PA501, PA601: first end PA302, PA402, PA502, PA602: the second terminal 100: Rotor with harmonic suppression structure 1: Rotor structure body 11: Inner edge of rotor 12: The outer edge of the rotor 121: main gap 1211: Center fillet 1212, 1213: outer fillet 1214,1215: straight line extension 122: The first auxiliary gap 123:Second Auxiliary Gap 1221, 1231: first outer fillet 1222, 1232: second round corner 1223,1233: Fillet 12231, 12331: first extension 12232, 12332: second extension 13: Magnet setting area 131: The first magnet slot 1311: first outer end 1312: first medial end 132: Second magnet slot 1321: second outer end 1322: second medial end 2: magnet 200: stator X: central axis CC: center of circle TC: curve IC: curve

The first figure is a schematic plan view showing the structure of the prior art permanent magnet motor; the second figure is an enlarged schematic view of the first circle A; The third figure is a three-dimensional schematic diagram showing a permanent magnet motor in the prior art; The fourth figure is a schematic plan view showing a rotor with a harmonic suppression structure provided in a preferred embodiment of the present invention arranged in a stator; The fifth picture is the enlarged schematic diagram of the fourth picture circle B; The sixth picture is an enlarged schematic diagram of circle C in the fifth picture; and The seventh figure is a schematic diagram showing the torque change curves measured during operation of the permanent magnet motor made with the rotor structure of the present invention and the permanent magnet motor of the prior art.

121: main gap

1211: Center fillet

1212, 1213: outer fillet

122: The first auxiliary gap

123:Second Auxiliary Gap

1221, 1231: first outer fillet

1222, 1232: second round corner

1223,1233: Fillet

12231, 12331: first extension

12232, 12332: second extension

131: The first magnet slot

132: Second magnet slot

2: magnet

X: central axis

Claims (9)

A rotor with a harmonic suppression structure, including: a rotor structure body, which is provided with a plurality of magnet installation areas around a circle center, and each of the magnet installation areas is provided with a first magnet groove and a second magnet groove. The first magnet groove and the second magnet groove are symmetrical to a central axis extending to the center of the circle and extend obliquely, a first outer end of the first magnet groove and a second outer end of the second magnet groove Adjacent to the central axis and a rotor outer edge of the rotor structural body, a first inner end of the first magnet slot and a second inner end of the second magnet slot are away from the central axis and the rotor outer edge , and the outer edge of the rotor is provided with a plurality of main notches, a plurality of first auxiliary notches and a plurality of second auxiliary notches, the centers of each of the main notches intersect at the central axis of each of the magnet installation areas , each of the first auxiliary notches and each of the second auxiliary notches are located on both sides of each of the main notches, and each of the first auxiliary notches includes a first auxiliary notch adjacent to the central axis an outer fillet, a second outer fillet away from the central axis, and an inner fillet between the first outer fillet and the second outer fillet; and a plurality of magnets respectively fixed in the magnet setting areas The first magnet slot and the second magnet slot. The rotor with a harmonic suppression structure as described in Claim 1, wherein the radius of curvature of the first outer fillet is 0.3 mm, the radius of curvature of the second outer fillet is 5 mm, and the radius of curvature of the inner fillet is 1mm. The rotor with harmonic suppression structure according to claim 1, wherein there is a first extension between the first outer fillet and the inner fillet, and there is a gap between the second outer fillet and the inner fillet There is a second extension section, and there is an included angle between the first extension section and the second extension section, and the included angle is 83 degrees. The rotor with harmonic suppression structure as described in claim 1, wherein each of the main notches includes a central fillet and two outer guide fillets, the central axis passes through the central guide fillet, and the two outer guide fillets The outer lead fillets are located on both sides of the central lead fillet. The rotor with a harmonic suppression structure as claimed in claim 4, wherein the radius of curvature of the central guide fillet is 5mm. The rotor with harmonic suppression structure as claimed in claim 4, wherein the radius of curvature of the two outer fillets is 5mm. The rotor with a harmonic suppression structure as described in claim 4, wherein each of the main notches further includes two straight line extensions, and the two straight line extensions are respectively extended from the central guide radius to the two outer guide circles horn. The rotor with harmonic suppression structure as described in Claim 7, wherein there is a notch opening angle between the two straight line extensions, The opening angle of the notch is between 50 degrees and 70 degrees. The rotor with harmonic suppression structure as claimed in claim 8, wherein the opening angle of the notch is 62 degrees.

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