Low-loss disc type motor rotor structure

Abstract

The low-loss disc type motor rotor structure comprises a rotor disc, a sheath and magnetic steel, the rotor disc comprises a base body and a plurality of supporting portions, the supporting portions are arranged in an annular array with the base body as the center, magnetic steel installation grooves are formed between the supporting portions, the magnetic steel is arranged in the magnetic steel installation grooves, and the sheath is arranged in the magnetic steel installation grooves. A sheath is arranged outside the rotor disc; strip-shaped grooves are formed in the front face and the back face of the supporting part, the strip-shaped grooves extend to the base body, a plurality of strip-shaped holes are formed in the base body in an annular array mode, and the strip-shaped holes are located between the strip-shaped grooves. According to the utility model, the strip-shaped groove is arranged on the supporting part, the supporting part of the metal rotor disc is far away from the stator within the action range of the air gap of the stator and the rotor, so that the eddy current loss generated by induction is greatly reduced, and the strip-shaped hole is matched, so that the path for generating the induction eddy current on the supporting part of the metal rotor disc is further increased, and the generation of the eddy current is blocked; and the eddy-current loss is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of motor rotors, in particular to a low-loss disc-type motor rotor structure. Background Art

[0002] Disc motors feature small size, light weight, high power density, and short axial dimensions, making them suitable for most thin-profile installations. A disc motor rotor typically consists of a rotor disc, magnets, and a sheath. During operation, the alternating magnetic field creates numerous small eddy currents (circulating currents) on the rotor disc's surface, generating eddy current losses. This heats the rotor disc, increases the risk of permanent magnet demagnetization, and affects motor efficiency. Utility Model Content

[0003] The purpose of the utility model is to provide a low-loss disc motor rotor structure in response to the defects and shortcomings of the prior art.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a low-loss disc motor rotor structure, including a rotor disc, a sleeve and a magnet, and its innovation lies in: the rotor disc includes a base and multiple support parts, the support parts are arranged in a circular array with the base as the center, and there are magnet mounting grooves between the support parts, and magnets are placed in the magnet mounting grooves. A sleeve is arranged on the outside of the rotor disc; strip grooves are provided on both sides of the support parts, and the strip grooves extend to the base, and a plurality of strip holes are provided in a circular array on the base, and the strip holes are located between the strip grooves.

[0005] Furthermore, the left and right side walls of the magnetic steel installation slot are provided with locking grooves, and the left and right sides of the magnetic steel are provided with positioning ridges, and the positioning ridges and the locking grooves cooperate with each other.

[0006] Furthermore, the sheath is made of any one of BMC, DMC and glass fiber.

[0007] After adopting the above structure, the beneficial effects of the utility model are:

[0008] The utility model provides a strip groove on the support part, so that the support part of the metal rotor disk is away from the stator within the range of the stator-rotor air gap, thereby greatly reducing the eddy current loss generated by induction. In combination with the strip hole, the path of the induced eddy current on the support part of the metal rotor disk is further increased, the generation of eddy current is blocked, and the eddy current loss is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a structural diagram of the utility model;

[0010] Figure 2 This is a schematic diagram of the split structure of the utility model.

[0011] Description of reference numerals:

[0012] 1 rotor disk, 11 base, 12 support portion, 13 magnetic steel mounting groove, 14 strip groove, 15 strip hole, 16 embedding groove, 2 sleeve, 3 magnetic steel, 31 positioning protrusion. DETAILED DESCRIPTION

[0013] The present invention will be further described below with reference to the accompanying drawings.

[0014] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0015] See Figure 1-2 A low-loss disc motor rotor structure includes a rotor disc 1, a sleeve 2, and magnets 3. The rotor disc 1 includes a base 11 and multiple support portions 12. The support portions 12 are arranged in a circular array with the base 11 as the center. Magnetic steel mounting slots 13 are located between the support portions 12. Magnets 3 are placed in the magnetic steel mounting slots 13. The sleeve 2 is provided on the outside of the rotor disc 1. Strip grooves 14 are provided on both the front and back sides of the support portion 12. The strip grooves 14 extend to the base 11. The base 11 has multiple strip holes 15 in a circular array. The strip holes 15 are located between the strip grooves 14. Specifically, the strip grooves 14 are provided on the support portion 12. Within the range of the stator-rotor air gap, the presence of the strip grooves 14 creates a gap between the support portion 12 and the stator, moving the support portion 12 of the metal rotor disc away from the stator, thereby significantly reducing the induced eddy current loss. Combined with the strip holes, the path for the induced eddy current to be generated on the support portion of the metal rotor disc is further increased, blocking the generation of eddy current and reducing the eddy current loss.

[0016] See Figure 2 In this embodiment, the left and right sidewalls of the magnet mounting slot 13 are provided with engaging grooves 16, and the left and right sides of the magnet 3 are provided with positioning protrusions 31. The positioning protrusions 31 and the engaging grooves 16 cooperate with each other. The interaction between the positioning protrusions 31 and the engaging grooves 16 can ensure the positioning and installation between the magnet 3 and the magnet mounting slot 13, ensuring stability after installation and effectively preventing the magnet from shifting due to high-speed rotation.

[0017] In this embodiment, the sheath 2 is made of any one of BMC, DMC, and glass fiber. BMC, DMC, and glass fiber are all non-metallic materials that do not generate eddy current losses. The sheath is preferably made of the above three materials, but is not limited to the above three materials and may also include other non-metallic materials.

[0018] The above description is only used to illustrate the technical solution of the present invention and is not intended to limit it. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in this field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. A low-loss disc motor rotor structure, comprising a rotor disc, a sheath, and magnetic steel, characterized in that: The rotor disk includes a base and multiple support parts, which are arranged in a circular array with the base as the center. There are magnetic steel mounting grooves between the support parts, and magnetic steel is placed in the magnetic steel mounting grooves. A sheath is provided on the outside of the rotor disk; strip grooves are provided on both sides of the support parts, and the strip grooves extend to the base. A plurality of strip holes are provided in a circular array on the base, and the strip holes are located between the strip grooves.

2. The low-loss disc motor rotor structure according to claim 1, characterized in that: The left and right side walls of the magnetic steel installation slot are provided with locking grooves, and the left and right sides of the magnetic steel are provided with positioning convex strips, and the positioning convex strips and the locking grooves cooperate with each other.

3. The low-loss disc motor rotor structure according to claim 1, characterized in that: The sheath is made of any one of BMC, DMC and glass fiber.

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