Rotor structure

Abstract

A rotor structure comprises a silicon steel sheet body. The silicon steel sheet body is provided with a plurality of magnetic poles, an axis and an outer edge, and each magnetic pole is provided with a double-layer V-shaped magnet groove structure. The double-layer V-shaped magnet groove structure comprises an inner-layer V-shaped magnet groove group close to the axis and an outer-layer V-shaped magnet groove group close to the outer edge. The inner-layer V-shaped magnet groove group is provided with an inner-side magnetic bridge close to the axis in the radial direction, the outer-layer V-shaped magnet groove group is provided with an outer-side magnetic bridge close to the axis in the radial direction, and the width of the inner-side magnetic bridge is larger than that of the outer-side magnetic bridge. The double-layer V-shaped magnet groove structure comprises four magnet grooves, each magnet groove is provided with two long edges, and one of the two long edges, which is relatively far away from the corresponding inner side magnetic bridge or the corresponding outer side magnetic bridge, is provided with a blocking point. The silicon steel sheet body has a riveting point. The inner-layer V-shaped magnet groove group or the outer-layer V-shaped magnet groove group is provided with a radial magnetic bridge.

Description

Technical Field

[0001] The utility model relates to a rotor structure of a motor, and in particular to a rotor structure with an optimized magnetic bridge design. Background Art

[0002] The magnets contained in the silicon steel sheet body of the motor rotor structure have tolerances and lead angles in their manufacturing dimensions. When there is no blocking point in the magnet slots of the silicon steel sheet, displacement space of the magnets will be generated when the rotor rotates.

[0003] In addition, when the magnet stop point in the silicon steel sheet magnet slot is not well positioned (for example, the magnet slot does not have a stop point on the long side connecting the inner / outer magnetic bridge), the stress during operation is easily concentrated on the silicon steel sheet bridge part and causes breakage. Utility Model Content

[0004] The utility model provides a rotor structure to solve the problems of the prior art.

[0005] According to some embodiments of the present invention, a rotor structure includes a silicon steel sheet body. The silicon steel sheet body has multiple groups of magnetic poles, an axis, and an outer edge. Each group of magnetic poles has a double-layer V-shaped magnet groove structure. The double-layer V-shaped magnet groove structure includes an inner V-shaped magnet groove group close to the axis and an outer V-shaped magnet groove group close to the outer edge. The angle between a pair of magnet grooves in the inner V-shaped magnet groove group is smaller than the angle between a pair of magnet grooves in the outer V-shaped magnet groove group. The inner V-shaped magnet groove group has an inner magnetic bridge radially close to the axis, and the outer V-shaped magnet groove group has an outer magnetic bridge radially close to the axis. The width of the inner magnetic bridge is greater than the width of the outer magnetic bridge. Either the pair of inner magnetic grooves or the pair of outer magnetic grooves has two long sides, and the one of the two long sides that is relatively far away from the corresponding inner magnetic bridge or the outer magnetic bridge has a stop point. The silicon steel sheet body has a rivet point extending axially therethrough, with a line connecting the geometric center of the rivet point and the axis passing through the inner magnetic bridge and the outer magnetic bridge. The inner V-shaped magnet slot group or the outer V-shaped magnet slot group has a pair of radial magnetic bridges extending from the inner magnetic slots or the outer magnetic slots, respectively, and the pair of radial magnetic bridges are further away from the axis than the inner magnetic bridge or the outer magnetic bridge.

[0006] According to some embodiments of the present invention, the width of the inner magnetic bridge is equal to 1.5 times the width of the air gap between the rotor structure and the stator structure.

[0007] According to some embodiments of the present invention, a width of the outer magnetic bridge is equal to a width of an air gap between the rotor structure and a stator structure.

[0008] According to some embodiments of the present invention, the width of the radial magnetic bridge is greater than the width of the air gap between the rotor structure and the stator structure.

[0009] According to some embodiments of the present invention, the silicon steel sheet body is composed of a plurality of stacked silicon steel sheets, and the width of the radial magnetic bridge is smaller than the thickness of a single silicon steel sheet.

[0010] According to some embodiments of the present invention, the rotor structure further includes a plurality of magnets located in the pair of inner magnet slots and the pair of outer magnet slots, each of the plurality of magnets has a width W, and the blocking point has a height h, where W / 10≤h≤W / 5.

[0011] According to some embodiments of the present invention, the rivet point is a rectangle.

[0012] According to some embodiments of the present invention, the rivet point is circular.

[0013] According to some embodiments of the present invention, the silicon steel sheet body further includes a plurality of magnetic barrier structures located near the outer edge and between the outer V-shaped magnet groove group.

[0014] According to some embodiments of the present invention, the magnetic barrier structure is selected from one of the following configurations: the long axis direction of the rectangular magnetic barrier is perpendicular to the outer V-shaped magnet groove group, the long axis direction of the rectangular magnetic barrier is perpendicular to the outer edge, the center of curvature of the arc-shaped magnetic barrier is toward the outer V-shaped magnet groove group, or a semicircular notch magnetic barrier is formed along the radial direction toward the outside of the outer edge.

[0015] According to some embodiments of the present invention, a ratio of the width of the inner magnetic bridge to the width of the outer magnetic bridge ranges from 1.2 to 1.6.

[0016] According to some embodiments of the present invention, a ratio of the width of the inner magnetic bridge to the width of the outer magnetic bridge is equal to 1.5.

[0017] In summary, the rotor structure of this invention optimizes the magnetic bridge form and adjusts the structure to a radial orientation. The radial magnetic bridge is aligned with the centrifugal force during rotation, reducing stress, increasing maximum speed, and effectively minimizing magnetic flux leakage. Furthermore, magnetic barriers can be incorporated into the edges of the rotor structure to increase the magnetic resistance of the silicon steel sheet path and reduce performance degradation caused by magnetic flux leakage.

[0018] The above description will be described in detail below with reference to an embodiment, and a further explanation of the technical solution of the present invention will be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] To make the above and other objects, features, advantages and embodiments of the present invention more apparent, the accompanying drawings are described as follows:

[0020] Figure 1 1 is a top view of a single magnetic pole of the motor structure of the first embodiment of the present invention;

[0021] Figure 2 1 is a top view of a single magnetic pole of a motor rotor structure according to a second embodiment of the present invention;

[0022] Figure 3 FIG1 is a top view of a single magnetic pole of a motor rotor structure according to a third embodiment of the present invention;

[0023] Figure 4 FIG1 is a top view of a single magnetic pole of a motor rotor structure according to a fourth embodiment of the present invention;

[0024] Figure 5 FIG1 is a top view of a single magnetic pole of a motor rotor structure according to a fifth embodiment of the present invention;

[0025] Figure 6 is a top view illustrating a single magnetic pole of a motor rotor structure according to a sixth embodiment of the present invention; and

[0026] Figure 7 It is a drawing Figure 6 A three-dimensional diagram of a single magnetic pole.

[0027]

Explanation of symbols

[0028] 100a: magnetic pole

[0029] 100b: magnetic pole

[0030] 100c: magnetic pole

[0031] 100d: magnetic pole

[0032] 100e: magnetic pole

[0033] 100f: magnetic pole

[0034] 101: Axis

[0035] 102: Inner magnetic bridge

[0036] 103: Inner V-shaped magnet groove group

[0037] 103a, 103b: magnet groove

[0038] 104: Outer magnetic bridge

[0039] 105: Outer V-shaped magnet groove group

[0040] 105a, 105b: magnet groove

[0041] 108: Block point

[0042] 119: Silicon steel sheet body

[0043] 119a: Silicon steel sheet

[0044] 110: stator structure

[0045] 111a, 111b, 111c: rivet points

[0046] 112a, 112b, 112c, 112d, 113a, 113b, 114a, 114b: magnetic barrier structure

[0047] 120a, 120b: radial magnetic bridge

[0048] 130:Magnet

[0049] 150: outer edge

[0050] G: air gap width

[0051] D1, D2, D3, D4: width

[0052] W: width

[0053] h: height

[0054] RD: Radial

[0055] A1, A2: Angle

[0056] r: radius

[0057] r1: distance

[0058] r2: distance

[0059] T:Thickness DETAILED DESCRIPTION

[0060] For a more detailed and complete description of the present invention, reference is made to the accompanying drawings and the various embodiments described below. Like numbers in the drawings represent identical or similar elements. Well-known elements and steps are not described in the embodiments to avoid unnecessary limitations on the present invention. In the embodiments and claims, unless otherwise specified, the words "a," "an," and "the" may refer to one or more.

[0061] Please refer to Figure 1, which shows a top view of a single magnetic pole of the motor structure according to the first embodiment of the present invention. The rotor structure's single magnetic pole 100a comprises an inner V-shaped magnet slot group 103 located near the axis 101 and an outer V-shaped magnet slot group 105 located near the outer edge 150, forming a double-layer V-shaped magnet slot structure. An air gap width G is defined between magnetic pole 100a and stator structure 110. The inner V-shaped magnet slot group 103 includes magnet slots 103a and 103b, with an inner magnetic bridge 102 located radially (RD) toward the axis 101 between the two slots. The outer V-shaped magnet slot group 105 comprises magnet slots 105a and 105b, with an outer magnetic bridge 104 located radially (RD) toward the axis 101 between the two slots. The width D1 of the inner magnetic bridge 102 is greater than the width D2 of the outer magnetic bridge 104. In some embodiments of the present invention, the magnetic pole 100a has a rectangular magnetic barrier structure (113a, 113b) located between the outer V-shaped magnet slot group 105 and the outer edge 150. The long axis of the magnetic barrier structure (113a, 113b) is perpendicular to the outer V-shaped magnet slot group 105 and may comprise an air layer, a magnet, or a high magnetic resistance material. The magnetic pole 100a has a rivet point 111a extending axially therethrough, and the line connecting the geometric center of the rivet point 111a and the axis 101 passes through the inner magnetic bridge 102 and the outer magnetic bridge 104.

[0062] In some embodiments of the present invention, the width D2 of the outer magnetic bridge 104 is equal to the air gap width G between the rotor structure and the stator structure, where the stator structure is radially coupled to the outer edge 150 of the rotor structure. In some embodiments of the present invention, the width D1 of the inner magnetic bridge 102 is equal to 1.5 times the air gap width G between the rotor structure and the stator structure. In some embodiments of the present invention, the ratio of width D1 to width D2 ranges from 1.2 to 1.6. In some embodiments of the present invention, the ratio of width D1 to width D2 is equal to 1.5. Rotor structures that meet the above width relationship are effective in reducing magnetic bridge stress.

[0063] Please refer to Figure 2, which illustrates a top view of a single magnetic pole of a motor rotor structure according to a second embodiment of the present invention. The single magnetic pole 100b of the rotor structure also has an inner V-shaped magnetic groove group 103 located near the axis 101 and an outer V-shaped magnetic groove group 105 located near the outer edge 150, forming a double-layer V-shaped magnetic groove structure. The magnetic pole 100b also has an inner magnetic bridge 102 and an outer magnetic bridge 104, as well as the aforementioned technical features. In some embodiments of the present invention, the magnetic pole 100b has a rivet point 111a extending axially therethrough, and the line connecting the geometric center of the rivet point 111a and the axis 101 passes through the inner magnetic bridge 102 and the outer magnetic bridge 104. The rivet point 111a is located farther from the axis 101 or closer to the outer edge 150 than the inner magnetic bridge 102 and the outer magnetic bridge 104. In some embodiments of the present invention, the rivet point 111a is rectangular, with the major axis of the rivet point 111a parallel to the radial direction RD. In some embodiments of the present invention, the magnetic pole 100b further has at least one inter-pole rivet point 111b extending along the normal vector of the magnet surface to reduce the influence on the magnetic lines of force.

[0064] In some embodiments of the present invention, the magnet slots 103a, 103b, 105a, and 105b all have stop points 108. The stop points 108 are located on the two long sides of each magnet slot that are relatively far away from the corresponding inner magnetic bridge 102 or outer magnetic bridge 104. In some embodiments of the present invention, the magnet 130 accommodated in the magnet slot has a width W (e.g., Figure 6 ), the blocking point 108 has a height h. The relationship between the height h of the blocking point 108 and the width W of the magnet 130 is W / 10≤h≤W / 5. This relationship also applies to the height of the blocking point 108 in other embodiments of the present invention. In some embodiments of the present invention, the magnetic pole 100b differs from other embodiments in that it has a long rectangular magnetic barrier structure (112a, 112b) located between the outer V-shaped magnet groove group 105 and the outer edge 150. The long axis of the magnetic barrier structure (112a, 112b) is perpendicular to the outer edge 150 and may include an air layer, a magnet, or a high magnetic resistance material.

[0065] Please refer to Figure 3, which illustrates a top view of a single magnetic pole of a motor rotor structure according to a third embodiment of the present invention. The single magnetic pole 100c of the rotor structure also has an inner V-shaped magnetic groove group 103 near the axis 101 and an outer V-shaped magnetic groove group 105 near the outer edge 150, forming a double-layer V-shaped magnetic groove structure. Magnetic pole 100c also has the aforementioned technical features similar to those of magnetic pole 100a, such as the inner magnetic bridge 102, outer magnetic bridge 104, and stop point 108. In some embodiments of the present invention, magnetic pole 100c has a rivet point 111a extending axially therethrough, and the line connecting the geometric center of rivet point 111a and the axis 101 passes through the inner magnetic bridge 102 and the outer magnetic bridge 104. In some embodiments of the present invention, the magnetic pole 100c is different from other embodiments in that the arc-shaped magnetic barrier structure (112c, 112d) is arranged between the outer V-shaped magnet groove group 105 and the outer edge 150. The center of curvature of the arc-shaped magnetic barrier structure (112c, 112d) is roughly toward the outer V-shaped magnet groove group 105, and may include an air layer, a magnet or a high magnetic resistance material.

[0066] Please refer to Figure 4 , which shows a top view of a single magnetic pole of a motor rotor structure according to the fourth embodiment of the present invention. The single magnetic pole 100d of the rotor structure also has an inner V-shaped magnet groove group 103 located near the axis 101 and an outer V-shaped magnet groove group 105 located near the outer edge 150, forming a double-layer V-shaped magnet groove structure. The inner V-shaped magnet groove group 103 includes magnet grooves 103a and 103b, with an angle A1 formed between the magnet grooves 103a and 103b. The outer V-shaped magnet groove group 105 includes magnet grooves 105a and 105b, with an angle A2 formed between the magnet grooves 105a and 105b. Angle A1 is smaller than angle A2. This angular relationship of the double-layer V-shaped magnet groove structure also applies to other embodiments of the present invention. Magnetic pole 100d also has the aforementioned technical features, including inner magnetic bridge 102, outer magnetic bridge 104, and stop point 108. In some embodiments of the present invention, magnetic pole 100d has a rivet point 111a extending axially therethrough, with the line connecting the geometric center of rivet point 111a and axis 101 passing through inner magnetic bridge 102 and outer magnetic bridge 104.

[0067] In some embodiments of the present invention, the angle A1 of the inner V-shaped magnet slot group has the relationship of 360 / p ≤ A1 ≤ r / (r-r1) x 360 / p, where p is the number of rotor poles, r is the radius of the rotor, and r1 is the distance between the inner magnetic bridge 102 and the shaft center 101. In some embodiments of the present invention, the angle A2 of the outer V-shaped magnet slot group has the relationship of 360 / p ≤ A2 ≤ r / (r-r2) x 360 / p, where p is the number of rotor poles, r is the radius of the rotor, and r2 is the distance between the outer magnetic bridge 104 and the shaft center 101. Rotors that meet this relationship for the inner and outer magnet spread angles can achieve better torque performance. The above relationship for the angles of the inner and outer V-shaped magnet slot groups also applies to other embodiments of the present invention.

[0068] In some embodiments of the present invention, the magnetic pole 100d is different from other embodiments in that a magnetic barrier structure (114a, 114b) with a semicircular notch is directly formed on the outer edge 150, which is arranged near the outer V-shaped magnet groove group 105. The notch of the magnetic barrier structure (114a, 114b) is formed along the radial direction RD toward the outside of the outer edge 150 and may include an air layer, a magnet or a high magnetic resistance material.

[0069] Please refer to Figure 5 , which illustrates a top view of a single magnetic pole of a motor rotor structure according to the fifth embodiment of the present invention. The rotor structure's single magnetic pole 100e also comprises an inner V-shaped magnetic groove group 103 located near the axis 101 and an outer V-shaped magnetic groove group 105 located near the outer edge 150, forming a double-layer V-shaped magnetic groove structure. Magnetic pole 100e also possesses the aforementioned technical features, including the inner magnetic bridge 102, outer magnetic bridge 104, and stop point 108. Magnetic pole 100e has a rivet point 111c extending axially therethrough, and the line connecting the geometric center of rivet point 111c and the axis 101 passes through the inner magnetic bridge 102 and the outer magnetic bridge 104. In some embodiments of the present invention, the magnetic pole 100e differs from other embodiments in that a circular rivet point 111c is used instead of the aforementioned rectangular rivet point, and the outer V-shaped magnet groove group 105 has a pair of radial magnetic bridges 120a. Each radial magnetic bridge 120a is farther from the axis 101 than the inner magnetic bridge 102 or the outer magnetic bridge 104. The radial magnetic bridge 120a is closer to the outer edge 150 than the inner magnetic bridge 102 or the outer magnetic bridge 104. In some embodiments of the present invention, the radial magnetic bridge 120a has a width D3, which is greater than the air gap width G between the rotor structure and the stator structure (refer to Figure 1 ), the width D3 is less than the thickness T of a single silicon steel sheet (refer to Figure 7In some embodiments of the present invention, rectangular or circular rivet points can be applied to various magnetic poles of the present invention. In some embodiments of the present invention, the radial magnetic bridge 120a enables the rotor structure to have better structural stress strength and low magnetic leakage characteristics. In some embodiments of the present invention, the rotor structure with radial magnetic bridge 120a (for example Figure 5 Embodiments) have less radial magnetic bridge rotor structure (e.g. Figure 4 The no-load back EMF increases by about 5%.

[0070] Please refer to Figure 6 、 7 , Figure 6 A top view of a single magnetic pole of a motor rotor structure according to a sixth embodiment of the present invention is shown. Figure 7 It is a drawing Figure 6 A three-dimensional diagram of a single magnetic pole. The silicon steel sheet body 119 of the single magnetic pole 100f is composed of multiple silicon steel sheets 119a stacked in the axial direction. The magnetic pole 100f of the above embodiment is also composed of multiple silicon steel sheets stacked in layers. The single magnetic pole 100f of the rotor structure also has an inner layer V-shaped magnet groove group 103 close to the axis 101 and an outer layer V-shaped magnet groove group 105 close to the outer edge 150 to form a double-layer V-shaped magnet groove structure. The magnetic pole 100f also has the above-mentioned technical features such as the inner magnetic bridge 102, the outer magnetic bridge 104 and the blocking point 108. In some embodiments of the present invention, the magnetic pole 100f has a penetrating rivet point 111a along the axial direction, and the line connecting the geometric center of the rivet point 111a and the axis 101 passes through the inner magnetic bridge 102 and the outer magnetic bridge 104. In some embodiments of the present invention, the magnetic pole 100f is different from other embodiments in that both the inner V-shaped magnet groove group and the outer V-shaped magnet groove group have radial magnetic bridges (120a, 120b), and the radial magnetic bridges (120a, 120b) are farther from the axis 101 than the inner magnetic bridge 102 or the outer magnetic bridge 104, or the radial magnetic bridges (120a, 120b) are closer to the outer edge 150 than the inner magnetic bridge 102 or the outer magnetic bridge 104. In some embodiments of the present invention, the radial magnetic bridge 120a has a width D3, and the width D3 is greater than the air gap width G between the rotor structure and the stator structure (refer to Figure 1 ), the width D3 is less than the thickness T of a single silicon steel sheet (refer to Figure 7 In some embodiments of the present invention, the radial magnetic bridge 120b has a width D4, which is greater than the air gap width G between the rotor structure and the stator structure (refer to Figure 1 ), the width D4 is less than the thickness T of a single silicon steel sheet (refer to Figure 7In some embodiments of the present invention, the radial magnetic bridges (120a, 120b) enable the rotor structure to have better structural stress strength and low magnetic leakage characteristics. In some embodiments of the present invention, the rotor structure with radial magnetic bridges (120a, 120b) (e.g. Figure 6 、 7 Embodiments) have less radial magnetic bridge rotor structure (e.g. Figure 4 The no-load back EMF increases by about 7.5%.

[0071] The rotor structure of this utility model optimizes the magnetic bridge form and adjusts the structure to extend radially. The radial magnetic bridge is aligned with the centrifugal force of the rotating rotor structure, which can reduce stress, increase the maximum speed, and effectively reduce magnetic flux leakage. In addition, magnetic barriers can be added to the edge of the rotor structure to increase the magnetic resistance of the silicon steel plate path and reduce the performance degradation caused by magnetic flux leakage.

[0072] Although the present invention has been disclosed above in terms of implementation methods, it is not intended to limit the present invention. Anyone skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope defined in the claims.

Claims

1. A rotor structure, characterized in that: Include: A silicon steel sheet body having multiple groups of magnetic poles, an axis and an outer edge, each group of magnetic poles having a double-layer V-shaped magnet groove structure; The double-layer V-shaped magnetic groove structure includes an inner V-shaped magnetic groove group close to the axis and an outer V-shaped magnetic groove group close to the outer edge, and an angle between a pair of inner magnetic grooves of the inner V-shaped magnetic groove group is smaller than an angle between a pair of outer magnetic grooves of the outer V-shaped magnetic groove group; The inner V-shaped magnet groove group has an inner magnetic bridge close to the axis along a radial direction, and the outer V-shaped magnet groove group has an outer magnetic bridge close to the axis along the radial direction, and a width of the inner magnetic bridge is greater than a width of the outer magnetic bridge; Any one of the pair of inner magnetic grooves and the pair of outer magnetic grooves has two long sides, and one of the two long sides that is relatively far away from the corresponding inner magnetic bridge or the outer magnetic bridge has a blocking point; The silicon steel sheet body has a rivet point, and a line connecting the geometric center of the rivet point and the axis passes through the inner magnetic bridge and the outer magnetic bridge; and The inner V-shaped magnet groove group or the outer V-shaped magnet groove group has a pair of radial magnetic bridges extending from the inner magnet grooves or the outer magnet grooves respectively, and the pair of radial magnetic bridges are farther from the axis than the inner magnetic bridge or the outer magnetic bridge.

2. The rotor structure according to claim 1, wherein: The width of the inner magnetic bridge is equal to 1.5 times the width of an air gap between the rotor structure and the stator structure.

3. The rotor structure according to claim 1, wherein: The width of the outer magnetic bridge is equal to the width of an air gap between the rotor structure and the stator structure.

4. The rotor structure according to claim 1, wherein: A width of the radial magnetic bridge is greater than a width of an air gap between the rotor structure and the stator structure.

5. The rotor structure according to claim 4, characterized in that: The silicon steel sheet body is composed of a plurality of silicon steel sheets stacked in an axial direction, and the width of the radial magnetic bridge is smaller than the thickness of a single silicon steel sheet.

6. The rotor structure according to claim 1, wherein: It also includes a plurality of magnets located in the pair of inner magnet slots and the pair of outer magnet slots. Each of the plurality of magnets has a width W. The blocking point has a height h, wherein W / 10≤h≤W / 5.

7. The rotor structure according to claim 1, wherein: The rivet point is a rectangle or a circle.

8. The rotor structure according to claim 1, wherein: The silicon steel sheet body further comprises a plurality of magnetic barrier structures, close to the outer edge and between the outer V-shaped magnet groove group.

9. The rotor structure according to claim 8, characterized in that: The magnetic barrier structure is selected from one of the following configurations: a rectangular magnetic barrier with its long axis perpendicular to the outer V-shaped magnet groove group, a rectangular magnetic barrier with its long axis perpendicular to the outer edge, an arc-shaped magnetic barrier with its center of curvature toward the outer V-shaped magnet groove group, or a semicircular notch magnetic barrier formed along the radial direction toward the outside of the outer edge.

10. The rotor structure according to claim 1, wherein: A ratio of the width of the inner magnetic bridge to the width of the outer magnetic bridge ranges from 1.2 to 1.6.

Images