Tool for surface-mounting Halbach array permanent magnets on rotor yoke of small permanent magnet motor

Abstract

The utility model discloses a tool for surface-mounting a Halbach array permanent magnet on a rotor yoke of a small permanent magnet motor. The tool 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 present invention relates to an assembly tool for a Halbach array structure permanent magnet rotor, and in particular to an assembly tool 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 that combines radial and tangential permanent magnets. Its purpose is to generate the strongest magnetic field with the least number of magnets. Due to the variable force directions between the permanent magnets in the Halbach permanent magnet rotor array structure, during the assembly process of the magnetic steel of each polarity, without external guidance and protection measures, the assembled permanent magnets may experience assembly problems such as tangential flipping, radial flying out, and difficulty in positioning. In serious cases, personal injury accidents may occur. Therefore, designing a tooling that is both convenient for assembly work and provides safety protection for operators is an urgent problem that needs to be solved on site: how to safely and efficiently assemble this special structure of permanent magnets. Summary of the Invention

[0003] The present invention provides a tooling for surface-mounting a Halbach array permanent magnet on a rotor yoke of a small permanent magnet motor, solving the technical problems of tangential flipping, radial flying out, and difficulty in positioning the permanent magnet during assembly.

[0004] The present invention solves the above technical problems through the following technical solutions:

[0005] A tooling for surface-mounting a Halbach array permanent magnet on the rotor yoke of a small permanent magnet motor comprises a motor shaft, a Halbach permanent magnet, a protective sleeve and a magnet push-in rod. A rotor yoke is arranged on the motor shaft, and magnetic positioning strip 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. Positioning strips are arranged at equal intervals of 90 arcs on the outer surface of the rotor yoke to the right of the left annular sealing end plate. A protective sleeve is sleeved on the four positioning strips. Two adjacent positioning strips, the protective sleeve and the rotor yoke constitute an assembly space for the Halbach permanent magnet. The longitudinal cross-section of the positioning strip is exactly the same as the longitudinal cross-section of the Halbach permanent magnet.

[0006] A countersunk hole with an internal thread is provided on the side elevation of the right end of the positioning strip, and an external thread is provided on the left end of the magnetic steel push-in rod. The external thread on the left end of the magnetic steel push-in rod is screwed together with the internal thread in the countersunk hole; the bottom end face 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 face of the positioning strip is fitted with the inner side face of the protective sleeve, and the lower end of the left elevation face and the lower end of the right elevation face of the positioning strip are clamped between the two adjacent magnetic steel positioning strip-like protrusions.

[0007] A method for assembling a Halbach array permanent magnet on a permanent magnet motor rotor yoke is performed using a tooling for surface-mounting a Halbach array permanent magnet on a small permanent magnet motor rotor yoke. The tooling includes a motor shaft, a rotor yoke disposed on the motor shaft, magnetic steel positioning strip protrusions disposed at evenly spaced arc intervals on the outer surface of the rotor yoke, a left annular blocking end plate disposed at the left end of the rotor yoke, positioning strips disposed at evenly spaced 90 arc intervals on the outer surface of the rotor yoke to the right of the left annular blocking end plate, protective sleeves sleeved on the four positioning strips, and a longitudinal cross-section of the positioning strips being identical to a longitudinal cross-section of the Halbach permanent magnet. The assembly method comprises the following steps:

[0008] The first step is to mark the polarity direction of the pre-mounted Halbach permanent magnets on each magnetic steel slot of the rotor yoke to ensure that the magnets are distributed according to the Halbach array structure;

[0009] Step 2: Use a magnet push rod to push the Halbach permanent magnet into the corresponding magnet slot and attach it to the surface in the assembly space of each magnet slot, which is composed of two adjacent positioning bars, a protective sleeve, and a rotor yoke, except for the magnet slot occupied by the four positioning bars.

[0010] Step 3: Push the external thread on the left end of the magnetic steel rod into the internal thread of the countersunk hole with internal threads on the right side of the positioning strip. Then, push the magnetic steel rod into the rod and pull the positioning strip out of the protective sleeve.

[0011] Step 4: Use the magnetic push rod to push the corresponding Halbach permanent magnet into the corresponding magnetic steel slot where the positioning bar was pulled out and attach it to the surface;

[0012] 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.

[0013] The present invention achieves the limitation of the assembled Halbach array permanent magnets through the protective sleeve and the magnetic steel slots. Since the positioning rod positions the protective sleeve in the radial direction, the uniform distribution of the magnetic steel slots is ensured. The protective sleeve protects and guides the magnetic steel, fundamentally solving the problems of tangential flipping, radial flying out, and difficulty in positioning of the permanent magnets that may exist in the tooling-free assembly process. It is convenient for assembly and provides good protection for people. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic structural diagram of the tooling of the present invention;

[0015] Figure 2 1 is a schematic structural diagram of the right end side elevation of the positioning bar 4 of the present invention;

[0016] Figure 3 Schematic diagram of the structure of the Halbach permanent magnet 8 of the present invention;

[0017] Figure 4 This is a schematic structural diagram of the magnetic steel push rod 14 of the present invention;

[0018] Figure 5 This is a schematic diagram of the structure after the Halbach array permanent magnets are surface-mounted on the rotor yoke of a small permanent magnet motor;

[0019] Figure 6 This is a quarter-section view of the rotor yoke of a small permanent magnet motor after the Halbach array permanent magnets are surface-mounted. DETAILED DESCRIPTION

[0020] The present invention is described in detail below with reference to the accompanying drawings:

[0021] A tooling for surface-mounting a Halbach array permanent magnet on the rotor yoke of a small permanent magnet motor comprises a motor shaft 1, a Halbach permanent magnet 8, a protective sleeve 5 and a magnet push-in rod 14. A rotor yoke 2 is provided on the motor shaft 1, and magnetic positioning strip protrusions 6 are provided at evenly spaced arc intervals on the outer surface of the rotor yoke 2. A left annular sealing end plate 3 is provided at the left end of the rotor yoke 2. Positioning strips 4 are provided at evenly spaced 90 arc intervals 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. Two adjacent positioning strips 4, the protective sleeve 5 and the rotor yoke 2 constitute an assembly space for the Halbach permanent magnet 8. The longitudinal cross-section of the positioning strip 4 is exactly the same as the longitudinal cross-section of the Halbach permanent magnet 8.

[0022] A countersunk hole 13 with an internal thread is provided on the right end side elevation of the positioning bar 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 face 9 of the positioning bar 4 is fitted together with 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 face 12 of the positioning bar 4 is fitted together with the inner side face 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 bar 4 are clamped between the two adjacent magnetic steel positioning strip-shaped protrusions 6.

[0023] A method for assembling a Halbach array permanent magnet on a permanent magnet motor rotor yoke is performed using a tooling for surface-attaching a Halbach array permanent magnet on a small permanent magnet motor rotor yoke. The tooling includes a motor shaft 1, a rotor yoke 2 provided on the motor shaft 1, magnetic steel positioning strip protrusions 6 provided at evenly spaced arc intervals on the outer surface of the rotor yoke 2, a left annular blocking end plate 3 provided at the left end of the rotor yoke 2, positioning strips 4 provided at evenly spaced 90 arc intervals on the outer surface of the rotor yoke 2 to the right of the left annular blocking end plate 3, protective sleeves 5 sleeved on the four positioning strips 4, and the longitudinal cross-section of the positioning strips 4 is identical to the longitudinal cross-section of the Halbach permanent magnet 8. The assembly method comprises the following steps:

[0024] 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;

[0025] Step 2: Use the magnet push rod 14 to push the Halbach permanent magnet 8 into the corresponding magnetic steel slot and attach it to the surface in the assembly space of each magnetic steel slot 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;

[0026] Step 3: Connect the external thread 15 on the left end of the magnetic steel push rod 14 to the internal thread in the internally threaded countersunk hole 13 provided on the right end side elevation of the positioning bar 4. Then, pull the positioning bar 4 out of the protective sleeve 5 by pushing the magnetic steel push rod 14 into place.

[0027] 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 bar 4 and attach it to the surface;

[0028] 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.

[0029] 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 vertical surface 10 and the lower end of the right vertical surface 11 of the positioning strip 4 are clamped between the two adjacent magnetic steel positioning strip-shaped protrusions 6.

Claims

1. A tool for attaching a Halbach array permanent magnet to a rotor yoke of a small permanent magnet motor, comprising 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 provided on the motor shaft (1), and magnetic steel positioning strip protrusions (6) are provided on the outer surface of the rotor yoke (2) at equal intervals of arc, characterized in that: A left annular sealing end plate (3) is provided at the left end of the rotor yoke (2); positioning bars (4) are provided 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 bars (4); two adjacent positioning bars (4), the protective sleeves (5) and the rotor yoke (2) form an assembly space for the Halbach permanent magnet (8); and the longitudinal cross-section of the positioning bar (4) is exactly the same as the longitudinal cross-section of the Halbach permanent magnet (8).

2. The tooling for surface-mounting a Halbach array permanent magnet on a rotor yoke of a small permanent magnet motor according to claim 1, characterized in that: A countersunk hole (13) with an internal thread is provided on the right end side elevation of the positioning bar (4), and an external thread (16) is provided on the left end of the magnetic steel push-in rod (14), and 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 bar (4) is fitted with 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 bar (4) is fitted with 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 bar (4) are clamped between the two adjacent magnetic steel positioning strip-shaped protrusions (6).

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