Assembly method for surface-mounting Halbach array permanent magnets on rotor yoke of permanent magnet motor

Abstract

The invention discloses an assembling method for surface-mounting a Halbach array permanent magnet on a rotor yoke of a permanent magnet motor. The assembling method solves the problems that the permanent magnet is prone to tangential overturning and radial flying-out and is difficult to be in place in the assembling process. A rotor yoke (2) is arranged on a motor rotating shaft (1), magnetic steel positioning strip-shaped protrusions (6) are arranged on the outer surface of the rotor yoke (2) at equal radian intervals, a left side annular blocking end plate (3) is arranged at the left end of the rotor yoke (2), and positioning strips (4) are arranged on the outer surface of the rotor yoke (2) on the right side of the left side annular blocking end plate (3) at equal 90 radian intervals. The four positioning strips (4) are sleeved with protective sleeves (5), and the longitudinal sections of the positioning strips (4) are completely the same as those of the Halbach permanent magnets (8); the installation time of the magnetic steel is greatly shortened, the production efficiency is remarkably improved, and the labor intensity can be greatly reduced.

Description

Technical Field

[0001] The invention relates to an assembly tool for a Halbach array structure permanent magnet rotor, and in particular to an assembly method for surface-mounting a Halbach array structure magnetic steel on a rotor yoke of a small permanent magnet motor. Background Art

[0002] The Halbach permanent magnet rotor array structure is a permanent magnet arrangement method that combines radial and tangential permanent magnets. The purpose is to use the least amount of magnets to generate the strongest magnetic field. Since the force directions between the permanent magnets in the Halbach permanent magnet rotor array structure are variable, during the assembly process of the magnetic steels of each polarity, if there are no external guidance and protection measures, the assembled permanent magnets will have assembly problems such as tangential flipping, radial flying out, and difficulty in positioning, and in serious cases, personal injury accidents may occur. Therefore, designing a tooling that is not only conducive to assembly work, but also can play a role in safety protection for operators is an urgent problem that needs to be solved on site in terms of how to safely and efficiently assemble this special structure of permanent magnets. Summary of the invention

[0003] The invention provides an assembly method for surface-mounting a Halbach array permanent magnet on a permanent magnet motor rotor yoke, which solves the technical problems that the permanent magnet is prone to tangential flipping, radial flying out and difficulty in positioning during the assembly process.

[0004] The present invention solves the above technical problems through the following technical solutions: A tooling for mounting a Halbach array permanent magnet on a rotor yoke of a small permanent magnet motor comprises a motor shaft, a Halbach permanent magnet, a protective sleeve and a magnetic steel push-in rod. A rotor yoke is arranged on the motor shaft, and magnetic steel positioning strip-shaped protrusions are arranged at equal intervals of arc on the outer surface of the rotor yoke. A left annular sealing end plate is arranged at the left end of the rotor yoke, and positioning strips are arranged at equal intervals of 90 arcs on the outer surface of the rotor yoke on the right side of the left annular sealing end plate. Protective sleeves are sleeved on the four positioning strips, and two adjacent positioning strips, the protective sleeve and the rotor yoke form an assembly space for the Halbach permanent magnet; the longitudinal section of the positioning strip is completely the same as the longitudinal section of the Halbach permanent magnet.

[0005] A countersunk hole with an internal thread is arranged on the side elevation of the right end of the positioning strip, and an external thread is arranged on the left end of the magnetic steel push-in rod. The external thread at the left end of the magnetic steel push-in rod is screwed together with the internal thread in the countersunk hole; the bottom end surface of the positioning strip is fitted with the magnetic steel bonding surface between the two adjacent magnetic steel positioning strip-like protrusions on the rotor yoke, and the top end surface of the positioning strip is fitted with the inner side surface of the protective sleeve, and the lower end of the left elevation surface and the lower end of the right elevation surface of the positioning strip are clamped between the two adjacent magnetic steel positioning strip-like protrusions.

[0006] An assembly method for attaching a Halbach array permanent magnet to a permanent magnet motor rotor yoke is performed by a tooling for attaching a Halbach array permanent magnet to a small permanent magnet motor rotor yoke, the tooling comprising a motor shaft, a rotor yoke is arranged on the motor shaft, magnetic steel positioning strip-shaped protrusions are arranged at equal intervals of arc on the outer surface of the rotor yoke, a left annular blocking end plate is arranged at the left end of the rotor yoke, positioning strips are arranged at equal intervals of 90 arcs on the outer surface of the rotor yoke on the right side of the left annular blocking end plate, a protective sleeve is sleeved on the four positioning strips, and the longitudinal section of the positioning strip is completely the same as the longitudinal section of the Halbach permanent magnet; the assembly method comprises the following steps: The first step is to mark the polarity direction of the pre-mounted Halbach permanent magnet on each magnetic steel slot of the rotor yoke to ensure that the magnetic steel is distributed according to the Halbach array structure; Step 2: In the assembly space of each magnetic steel slot of the Halbach permanent magnet, which is composed of two adjacent positioning bars, a protective sleeve and a rotor yoke, except for the magnetic steel slot occupied by four positioning bars, the Halbach permanent magnet is pushed into the corresponding magnetic steel slot by using a magnetic steel pushing rod and attached to the surface; Step 3: Connect the external thread at the left end of the magnetic steel push-in rod with the internal thread in the countersunk hole with internal thread provided on the side elevation of the right end of the positioning strip, and pull the positioning strip out of the protective sleeve by pushing the magnetic steel push-in rod; Step 4: Use a magnetic steel push rod to push the corresponding Halbach permanent magnet into the corresponding magnetic steel slot of the pulled-out positioning strip and attach it to the surface; Step 5. After removing the protective sleeve, assemble the right annular sealing end plate of the rotor; use a surface magnetic distribution detector to detect the magnetic flux density on the surface of each magnetic pole.

[0007] The present invention realizes the limitation of the assembled Halbach array permanent magnet through the protective sleeve and the magnetic steel groove. Since the positioning rod positions the protective sleeve in the radial direction, the uniform distribution of the magnetic steel groove is guaranteed. The protective sleeve protects and guides the magnetic steel, and fundamentally solves the problems of tangential flipping, radial flying out, and difficulty in positioning of the permanent magnet in the process of assembly without tooling. It is conducive to assembly and provides good protection for people. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a schematic diagram of the structure of the tooling of the present invention; Figure 2 It is a structural schematic diagram of the right end side elevation of the positioning strip 4 of the present invention; Figure 3 is a schematic structural diagram of the Halbach permanent magnet 8 of the present invention; Figure 4 It is a structural schematic diagram of the magnetic steel push rod 14 of the present invention; Figure 5This is a schematic diagram of the structure when the Halbach array permanent magnet is surface mounted on the rotor yoke of a small permanent magnet motor; Figure 6 This is a quarter cross-sectional view after the Halbach array permanent magnets are mounted on the rotor yoke of a small permanent magnet motor. DETAILED DESCRIPTION

[0009] The present invention is described in detail below in conjunction with the accompanying drawings: A tooling for attaching a Halbach array permanent magnet on a rotor yoke of a small permanent magnet motor comprises a motor shaft 1, a Halbach permanent magnet 8, a protective sleeve 5 and a magnetic steel push-in rod 14, wherein a rotor yoke 2 is arranged on the motor shaft 1, magnetic steel positioning strip protrusions 6 are arranged at equal intervals of arc on the outer surface of the rotor yoke 2, a left annular blocking end plate 3 is arranged at the left end of the rotor yoke 2, positioning strips 4 are arranged at equal intervals of 90 arcs on the outer surface of the rotor yoke 2 on the right side of the left annular blocking end plate 3, and protective sleeves 5 are sleeved on the four positioning strips 4, and two adjacent positioning strips 4, the protective sleeve 5 and the rotor yoke 2 form an assembly space for the Halbach permanent magnet 8; the longitudinal section of the positioning strip 4 is exactly the same as the longitudinal section of the Halbach permanent magnet 8.

[0010] A countersunk hole 13 with an internal thread is provided on the right side elevation of the positioning strip 4, and an external thread 16 is provided on the left end of the magnetic steel push-in rod 14. The external thread 16 at the left end of the magnetic steel push-in rod 14 is screwed together with the internal thread in the countersunk hole 13; the bottom end surface 9 of the positioning strip 4 is attached to the magnetic steel bonding surface 7 between the two adjacent magnetic steel positioning strip-shaped protrusions 6 on the rotor yoke 2, and the top end surface 12 of the positioning strip 4 is attached to the inner side surface of the protective sleeve 5. The lower end of the left side elevation 10 and the lower end of the right side elevation 11 of the positioning strip 4 are clamped between the two adjacent magnetic steel positioning strip-shaped protrusions 6. .

[0011] An assembly method for attaching a Halbach array permanent magnet to a permanent magnet motor rotor yoke is performed by a tooling for attaching a Halbach array permanent magnet to a small permanent magnet motor rotor yoke, the tooling comprising a motor shaft 1, a rotor yoke 2 is arranged on the motor shaft 1, magnetic steel positioning strip protrusions 6 are arranged at equal intervals of arc on the outer surface of the rotor yoke 2, a left annular blocking end plate 3 is arranged at the left end of the rotor yoke 2, positioning strips 4 are arranged at equal intervals of 90 arcs on the outer surface of the rotor yoke 2 on the right side of the left annular blocking end plate 3, and protective sleeves 5 are sleeved on the four positioning strips 4, and the longitudinal section of the positioning strip 4 is completely the same as the longitudinal section of the Halbach permanent magnet 8; the assembly method comprises the following steps: The first step is to mark the polarity direction of the pre-mounted Halbach permanent magnet 8 on each magnetic steel slot of the rotor yoke 2 to ensure that the magnetic steel is distributed according to the Halbach array structure; Step 2: In the assembly space of each magnetic steel slot of the Halbach permanent magnet 8 formed by two adjacent positioning bars 4, the protective sleeve 5 and the rotor yoke 2 except the magnetic steel slot occupied by the four positioning bars 4, the Halbach permanent magnet 8 is pushed into the corresponding magnetic steel slot by using the magnetic steel pushing rod 14 and attached to the surface; Step 3: Connect the external thread 15 at the left end of the magnetic steel push-in rod 14 with the internal thread in the internally threaded countersunk hole 13 provided on the right end side elevation of the positioning bar 4, and pull the positioning bar 4 out of the protective sleeve 5 by pushing the magnetic steel push-in rod 14; Step 4: Use the magnetic steel push rod 14 to push the corresponding Halbach permanent magnet 8 into the corresponding magnetic steel slot of the pulled-out positioning strip 4 and attach it to the surface; Step 5: After removing the protective sleeve 5, assemble the right annular sealing end plate of the rotor; use a surface magnetic distribution detector to detect the magnetic flux density on the surface of each magnetic pole.

[0012] The bottom end surface 9 of the positioning strip 4 is bonded to the magnetic steel bonding surface 7 between the two adjacent magnetic steel positioning strip-shaped protrusions 6 on the rotor yoke 2, the top end surface 12 of the positioning strip 4 is bonded to the inner side surface of the protective sleeve 5, and the lower end of the left side vertical surface 10 and the lower end of the right side vertical surface 11 of the positioning strip 4 are clamped between the two adjacent magnetic steel positioning strip-shaped protrusions 6.

Claims

1. A method for assembling a Halbach array permanent magnet on a permanent magnet motor rotor yoke, which is performed by using a tooling for attaching a Halbach array permanent magnet on a small permanent magnet motor rotor yoke, wherein a rotor yoke (2) is arranged on a motor shaft (1), and magnetic steel positioning strip protrusions (6) are arranged at equal intervals of arc on the outer surface of the rotor yoke (2), characterized in that: A left annular sealing end plate (3) is arranged at the left end of the rotor yoke (2); positioning strips (4) are arranged at equal intervals of 90 arcs on the outer surface of the rotor yoke (2) to the right of the left annular sealing end plate (3); protective sleeves (5) are sleeved on the four positioning strips (4); the longitudinal cross-section of the positioning strips (4) is completely the same as the longitudinal cross-section of the Halbach permanent magnet (8); the assembly method comprises the following steps: The first step is to mark the polarity direction of the pre-mounted Halbach permanent magnet (8) on each magnetic steel slot of the rotor yoke (2) to ensure that the magnetic steel is distributed according to the Halbach array structure; Step 2: In the assembly space of each magnetic steel slot of the Halbach permanent magnet (8) formed by two adjacent positioning bars (4), the protective sleeve (5) and the rotor yoke (2), except for the magnetic steel slot occupied by the four positioning bars (4), the Halbach permanent magnet (8) is pushed into the corresponding magnetic steel slot by using a magnetic steel pushing rod (14) and attached to the surface; Step 3: Screw the external thread (15) at the left end of the magnetic steel push rod (14) together with the internal thread in the internally threaded countersunk hole (13) provided on the right end side elevation of the positioning strip (4), and pull the positioning strip (4) out of the protective sleeve (5) by pushing the magnetic steel push rod (14); Step 4: Use a magnetic steel push rod (14) to push the corresponding Halbach permanent magnet (8) into the corresponding magnetic steel slot of the pulled-out positioning strip (4) and attach it to the surface; Step 5: After removing the protective sleeve (5), assemble the right annular sealing end plate of the rotor; use a magnetic distribution detector to detect the magnetic flux density on the surface of each magnetic pole.

2. The method for assembling a Halbach array permanent magnet on a permanent magnet motor rotor yoke according to claim 1, characterized in that: The bottom end surface (9) of the positioning strip (4) is bonded to the magnetic steel bonding surface (7) between two adjacent magnetic steel positioning strip-shaped protrusions (6) on the rotor yoke (2), the top end surface (12) of the positioning strip (4) is bonded to the inner side surface of the protective sleeve (5), and the lower end of the left side elevation (10) and the lower end of the right side elevation (11) of the positioning strip (4) are clamped between the two adjacent magnetic steel positioning strip-shaped protrusions (6).

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