A high-speed permanent magnet motor rotor structure

Abstract

The utility model relates to a high-speed permanent magnet motor rotor structure, its structure is no lamination rotor, including the pivot and the magnetic steel, the magnetic steel is axially divided into several sections, each section adjacent cladding is in the pivot surface, each section magnetic steel includes several magnetic steel units, each section all magnetic steel units circumferentially evenly spaced cladding is in the pivot surface, all magnetic steel whole outside cladding sheath, the pivot on the sheath both ends outside side is equipped with left baffle ring and right baffle ring. The utility model has the advantages of: reasonable structure design, adopts no lamination design, can simplify rotor structure, controls the rotor deformation from the source under the centrifugal force effect of lamination due to high speed, and selects suitable pivot, sheath and baffle ring material, can effectively satisfy the high-speed operation of high-speed permanent magnet motor.

Description

Technical Field

[0001] This utility model relates to a rotor structure of a permanent magnet motor, specifically a rotor structure of a high-speed permanent magnet motor. Background Technology

[0002] Motors with speeds exceeding 10,000 rpm are generally classified as high-speed motors. Alternatively, the linear velocity of the rotor can be used for definition; the linear velocity of a high-speed motor is typically greater than 50 m / s. The rotor structure of high-speed motors, especially high-speed permanent magnet motors, is limited by current rotor technology, making it difficult to effectively ensure rotor stability during high-speed operation. This is primarily due to rotor deformation caused by centrifugal force on the rotor laminations at high speeds. Utility Model Content

[0003] This utility model proposes a rotor structure for a high-speed permanent magnet motor, which aims to overcome the above-mentioned shortcomings of the existing technology and effectively meet the working requirements of a high-speed permanent magnet motor.

[0004] The technical solution of this utility model is a high-speed permanent magnet motor rotor structure, which is a laminationless rotor, including a shaft and magnets. The magnets are axially divided into several segments, each segment adjacent to each other covering the surface of the shaft. Each segment of magnets includes several magnet units. All magnet units in each segment are circumferentially and evenly spaced around the surface of the shaft. All magnets are wrapped with a protective sleeve on the outside. A left retaining ring and a right retaining ring are provided on the shaft at both ends of the protective sleeve.

[0005] Preferably, the magnet unit has an unequal circular design. This can effectively reduce harmonic losses, thereby reducing electromagnetic pulsation during high-speed rotor rotation.

[0006] Preferably, the gaps between the sheath and the magnets, as well as between adjacent magnet units, are filled with potting compound. This ensures the stability of the magnets and the integrity of the entire rotor during high-speed operation.

[0007] Preferably, the rotating shaft is made of 0Cr17Ni4Cu4Nb martensitic stainless steel, and the sheath, left retaining ring, and right retaining ring are made of GH4169 nickel-based alloy. These high-strength materials further ensure the structural stability of the rotor under high-speed operation. The use of the aforementioned high-strength shaft steel material, combined with the structure of surface-mounted magnets and an outer high-strength magnet sheath, ensures that the motor can meet the high-speed operation requirements of 100,000 RPM.

[0008] Preferably, the potting compound 6 is an epoxy resin-based potting compound. Its temperature resistance is 180-280℃, ensuring the stability of the magnets and the integrity of the entire rotor during high-speed operation.

[0009] The advantages of this utility model are: reasonable structural design, adopting a lamination-free design, which simplifies the rotor structure, controls the rotor deformation caused by centrifugal force at high speeds from the source, and selects appropriate shaft, sleeve and retaining ring materials to effectively meet the high-speed operation of high-speed permanent magnet motors. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the axial structure of the rotor structure of the high-speed permanent magnet motor of this utility model.

[0011] Figure 2 This is a radial structural schematic diagram of the rotor structure of the high-speed permanent magnet motor of this utility model.

[0012] In the diagram, 1 is the shaft, 2 is the magnet, 3 is the sheath, 4 is the left retaining ring, 5 is the right retaining ring, and 6 is the potting compound. Detailed Implementation

[0013] The present invention will be further described in detail below with reference to embodiments and specific implementation methods.

[0014] like Figure 1 , 2 As shown, a high-speed permanent magnet motor rotor structure is a laminationless rotor, including a rotating shaft 1 and magnets 2. The magnets 2 are axially divided into several segments, each segment adjacent to each other covering the surface of the rotating shaft 1. Each segment of magnets 2 includes several magnet units. All magnet units in each segment are circumferentially and evenly spaced around the surface of the rotating shaft 1. All magnets 2 are wrapped with a protective sleeve 3 on the outside. A left retaining ring 4 and a right retaining ring 5 are provided on the rotating shaft 1 at both ends of the protective sleeve 3.

[0015] In the specific design, the magnet unit is designed with an unequal circle, which can effectively reduce harmonic losses and thus reduce electromagnetic pulsation when the rotor rotates at high speed. The gap between the sheath 3 and the magnet 2, as well as between adjacent magnet units, is filled with potting compound 6, preferably epoxy resin-based potting compound with a temperature resistance of 180-280℃. Vacuum potting treatment is performed to ensure the stability of the magnet and the integrity of the entire rotor when operating at high speed. In actual production, the sheath 2, left retaining ring 4 and right retaining ring 5 are respectively interference-fitted with magnet 2 and rotating shaft 1; the joint between sheath 2 and left retaining ring 4 and right retaining ring 5 is treated with open weld; the shaft extension and bearing stop of sheath 2, left retaining ring 4, right retaining ring 5 and rotating shaft 1 need to leave a margin for secondary processing, which can ensure the high runout and dynamic balance requirements of the rotor and eliminate the deformation generated during the rotor manufacturing process.

[0016] In a preferred embodiment, the shaft 1 is made of 0Cr17Ni4Cu4Nb martensitic stainless steel, and the sleeve 3, left retaining ring 4 and right retaining ring 5 are made of GH4169 nickel-based alloy. The above high-strength materials can further effectively ensure the structural stability of the rotor under high-speed operation. The shaft adopts the above-mentioned high-strength shaft steel material, combined with the structure of surface-mounted magnets and high-strength magnet sleeves, which can ensure that the motor can meet the high-speed operation of 100,000 revolutions per minute.

[0017] All of the components described above are existing technologies, and those skilled in the art can use any model and existing design that can achieve their corresponding functions.

[0018] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present utility model, and these all fall within the protection scope of the present utility model.

Claims

1. A rotor structure for a high-speed permanent magnet motor, characterized in that, The rotor is a laminationless rotor, including a shaft (1) and magnets (2). The magnets (2) are divided into several segments along the axis, and each segment is adjacent to the surface of the shaft (1). Each segment of magnets (2) includes several magnet units. All magnet units in each segment are evenly spaced around the surface of the shaft (1) in the circumferential direction. All magnets (2) are wrapped with a sheath (3) on the outside of the whole. A left retaining ring (4) and a right retaining ring (5) are provided on the shaft (1) at both ends of the sheath (3).

2. The high-speed permanent magnet motor rotor structure as described in claim 1, characterized in that, The magnetic steel unit is designed with unequal circles.

3. The high-speed permanent magnet motor rotor structure as described in claim 1, characterized in that, The sheath (3) and the gap between the magnet (2) and the adjacent magnet units are filled with potting compound (6).

4. The high-speed permanent magnet motor rotor structure as described in claim 1, characterized in that, The rotating shaft (1) is made of 0Cr17Ni4Cu4Nb martensitic stainless steel, and the sheath (3), left retaining ring (4) and right retaining ring (5) are made of GH4169 nickel-based alloy.

5. The high-speed permanent magnet motor rotor structure as described in claim 3, characterized in that, The potting compound (6) is an epoxy resin-based potting compound.

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