A magnetizing structure and magnetizing method for a permanent magnet brushless DC IPM motor

Abstract

The present invention discloses a magnetizing structure for a permanent magnet brushless DC (IPM) motor, comprising an iron core and magnetic tiles thereon. An auxiliary magnetizing structure and a main magnetizing structure are sequentially arranged on the outer side of the iron core from the inside out. Multiple auxiliary magnetizing heads facing the magnetizing portion of the iron core's triangular region are arranged on the inner side of the auxiliary magnetizing structure. Similarly, multiple main magnetizing heads facing the magnetizing portion of the iron core's triangular region are arranged on the inner side of the main magnetizing structure. The present invention also discloses a magnetizing method for a permanent magnet brushless DC (IPM) motor, employing a magnetizing structure comprising the following steps: providing a magnetizing voltage to the main magnetizing structure via a first circuit, with the main magnetizing head facing the magnetizing portion of the iron core between two magnetic tiles; and providing a magnetizing voltage to the auxiliary magnetizing structure via a second circuit, with the auxiliary magnetizing head facing the magnetizing portion of the iron core between two magnetic tiles and located on the inner side of the main magnetizing structure. In the present invention, the addition of auxiliary magnetization improves the rotor's magnetizing saturation rate, reduces equipment requirements, and saves energy.

Description

Technical Field

[0001] The present invention relates to the technical field of magnetization of permanent magnet brushless DC IPM motors, in particular to a magnetization structure and a magnetization method for permanent magnet brushless DC IPM motors. Background Art

[0002] Existing magnetizer structures are limited. When magnetizing the SPM rotor, the magnets can achieve a high saturation rate. However, for integrated IPM rotors, the magnets may not be fully magnetized. The magnetic circuit at the bottom of the core between the two magnets is easily saturated. Even increasing the magnetizing voltage cannot effectively address this problem. Therefore, we propose a magnetizing structure and method for permanent magnet brushless DC (IPM) motors to address this issue. Summary of the Invention

[0003] The object of the present invention is to provide a magnetizing structure and a magnetizing method for a permanent magnet brushless DC (IPM) motor to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a magnetizing structure for a permanent magnet brushless DC (IPM) motor, comprising an iron core and magnetic tiles thereon, wherein an auxiliary magnetizing structure and a main magnetizing structure are sequentially arranged on the outside of the iron core from the inside to the outside, a plurality of auxiliary magnetizing heads facing the magnetizing portion of the iron core triangular area are arranged on the inside of the auxiliary magnetizing structure, and a plurality of main magnetizing heads facing the magnetizing portion of the iron core triangular area are also arranged on the inside of the main magnetizing structure.

[0005] Preferably, the magnetization portion of the triangular area is located outside the iron core between the two magnetic tiles.

[0006] Preferably, the auxiliary magnetizing structure is a cylindrical structure with an open top, the auxiliary magnetizing heads are centrally symmetrically distributed inside the auxiliary magnetizing structure, and the number of the auxiliary magnetizing heads is twice the number of the magnetic tiles.

[0007] Preferably, the auxiliary magnetizing head contacts one side of the magnetic tiles.

[0008] Preferably, the main magnetizing structure is a cylindrical structure with an open top, the main magnetizing heads are centrally symmetrically distributed inside the main magnetizing structure, and the number of the main magnetizing heads is twice the number of the magnetic tiles.

[0009] Preferably, the auxiliary magnetizing structure is rotatably installed in the main magnetizing structure through a rotating component, and the rotating component includes a tray and a turntable, both of which are circular. A bearing is coaxially installed on the top of the turntable, and the bearing passes through the bottom of the turntable. The outer ring of the bearing is fixedly connected to the center of the bottom of the main magnetizing structure, and the top of the inner ring of the bearing is connected to the bottom of the auxiliary magnetizing structure. The bottom of the inner ring of the bearing is fixedly connected to the connecting shaft, and the connecting shaft passes through the bottom of the main magnetizing structure. A sleeve shaft is sleeved on the outside of the connecting shaft, and the top of the sleeve shaft is connected to the connecting shaft through a spring. The bottom of the sleeve shaft is fixed to the tray, and the edge of the tray is provided with a lower latching tooth, and the bottom edge of the main magnetizing structure is provided with an upper latching tooth corresponding to the lower latching tooth. A handle for rotation is provided on the outside of the tray.

[0010] Preferably, a coaxial limit key is protruded from the outer side of the connecting shaft, a through slot is provided in the sleeve shaft, and a limit slot cooperating with the limit key is provided on the inner side wall of the through slot.

[0011] A magnetizing method for a permanent magnet brushless DC (IPM) motor, using the magnetizing structure, comprises the following steps:

[0012] The first circuit provides a magnetizing voltage to the main magnetizing structure, and the main magnetizing head faces the magnetizing part of the iron core between the two magnetic tiles;

[0013] The auxiliary magnetizing structure is provided with a magnetizing voltage through the second circuit. The auxiliary magnetizing head is directly facing the magnetizing portion of the iron core between the two magnetic tiles and is located inside the main magnetizing structure.

[0014] The first circuit and the second circuit are started simultaneously during the magnetization process.

[0015] Preferably, the first circuit and the second circuit share the same power supply system.

[0016] Compared with the prior art, the beneficial effects of the present invention are: the addition of auxiliary magnetization in the present invention improves the magnetization saturation rate of the rotor, reduces equipment requirements, and saves energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention;

[0018] Figure 2 This is an exploded schematic diagram of the structure of the present invention;

[0019] Figure 3 It is a schematic structural diagram of the rotating assembly of the present invention.

[0020] In the figure: 1 main magnetizing structure, 101 main magnetizing head, 2 auxiliary magnetizing structure, 201 auxiliary magnetizing head, 3 rotating assembly, 31 tray, 3101 lower latching tooth, 3102 handle, 32 turntable, 3201 bearing, 33 sleeve shaft, 3301 through slot, 3302 limit slot, 34 connecting shaft, 3401 limit key, 3402 spring, 4 iron core, 401 magnetic tile. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] See also Figure 1-3 The present invention provides a technical solution: a magnetizing structure for a permanent magnet brushless DC (IPM) motor, comprising an iron core 4 and a magnetic tile 401 thereon, wherein an auxiliary magnetizing structure 2 and a main magnetizing structure 1 are sequentially arranged on the outside of the iron core 4 from the inside to the outside, a plurality of auxiliary magnetizing heads 201 facing the magnetizing portion of the triangular area of ​​the iron core 4 are arranged on the inside of the auxiliary magnetizing structure 2, and a plurality of main magnetizing heads 101 facing the magnetizing portion of the triangular area of ​​the iron core 4 are also arranged on the inside of the main magnetizing structure 1.

[0023] Furthermore, the magnetization portion of the triangular area is located outside the iron core between the two magnetic tiles 401.

[0024] The auxiliary magnetizing structure 2 is a cylindrical structure with an open top. The auxiliary magnetizing heads 201 are centrally symmetrically distributed inside the auxiliary magnetizing structure 2. The number of the auxiliary magnetizing heads 201 is twice the number of the magnetic tiles 401. The auxiliary magnetizing heads 201 are in contact with one side of the magnetic tiles 401.

[0025] The main magnetizing structure 1 is a cylindrical structure with an open top. The main magnetizing heads 101 are centrally symmetrically distributed inside the main magnetizing structure 1 , and the number of the main magnetizing heads 101 is twice the number of the magnetic tiles 401 .

[0026] like Figure 2-3As shown, in order to facilitate the adjustment of the auxiliary magnetizing structure 2, the auxiliary magnetizing structure 2 is rotatably installed in the main magnetizing structure 1 through the rotating component 3. The rotating component 3 includes a tray 31 and a turntable 32, both of which are circular. A bearing 3201 is coaxially installed on the top of the turntable 32. The bearing 3201 passes through the bottom of the turntable 32. The outer ring of the bearing 3201 is fixedly connected to the center of the bottom of the main magnetizing structure 1, and the top of the inner ring of the bearing 3201 is connected to the bottom of the auxiliary magnetizing structure 2. The bottom of the inner ring of the bearing 3201 is fixedly connected to the connecting shaft 34. The connecting shaft 34 passes through the bottom of the main magnetizing structure 1. A sleeve shaft 33 is sleeved on the outside of the connecting shaft 34. The top of the sleeve shaft 33 is connected to the connecting shaft 34 by a spring 3402. The bottom of the sleeve shaft 33 is fixed to the tray 31. A lower latch 3101 is provided on the edge of the tray 31, and an upper latch 102 corresponding to the lower latch 3101 is provided on the bottom edge of the main magnetizing structure 1. A handle 3102 for rotation is provided on the outside of the tray 31.

[0027] A coaxial limit key 3401 is protruded from the outer side of the connecting shaft 34 , a through slot 3301 is provided in the sleeve shaft 33 , and a limit slot 3302 cooperating with the limit key 3401 is provided on the inner side wall of the through slot 3301 .

[0028] The main magnetizing structure 1 is hoisted on the frame by the ear plates on both sides. Pulling the tray 31 downward can disengage the lower latching tooth 3101 from the upper latching tooth 102. At this time, rotating the tray 31 can drive the turntable 32 to rotate, causing the auxiliary magnetizing structure 2 to rotate a certain range, ensuring that the auxiliary magnetizing head 201 can always contact one side of the magnetic tile 401.

[0029] A magnetizing method for a permanent magnet brushless DC (IPM) motor, using a magnetizing structure, comprises the following steps:

[0030] The first circuit provides a magnetizing voltage to the main magnetizing structure 1, and the main magnetizing head 101 faces the magnetizing portion of the iron core between the two magnetic tiles 401;

[0031] The auxiliary magnetizing structure 2 is provided with a magnetizing voltage through the second circuit. The auxiliary magnetizing head 201 is facing the magnetizing portion of the iron core between the two magnetic tiles 401 and is located inside the main magnetizing structure 1.

[0032] The first circuit and the second circuit share the same power supply system, and the first circuit and the second circuit are started simultaneously during the magnetization process.

[0033] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A magnetizing structure for a permanent magnet brushless DC (IPM) motor, comprising an iron core (4) and magnetic tiles (401) thereon, characterized in that: The outer side of the iron core (4) is provided with an auxiliary magnetizing structure (2) and a main magnetizing structure (1) in sequence from the inside to the outside, the inner side of the auxiliary magnetizing structure (2) is provided with a plurality of auxiliary magnetizing heads (201) facing the magnetizing portion of the triangular region of the iron core (4), and the inner side of the main magnetizing structure (1) is also provided with a plurality of main magnetizing heads (101) facing the magnetizing portion of the triangular region of the iron core (4); The auxiliary magnetizing structure (2) is rotatably mounted in the main magnetizing structure (1) via a rotating assembly (3). The rotating assembly (3) comprises a tray (31) and a turntable (32) both of which are circular. A bearing (3201) is coaxially mounted on the top of the turntable (32). The bearing (3201) passes through the bottom of the turntable (32). The outer ring of the bearing (3201) is fixedly connected to the center of the bottom of the main magnetizing structure (1). The top of the inner ring of the bearing (3201) is connected to the bottom of the auxiliary magnetizing structure (2). The bottom of the inner ring of the bearing (3201) is fixedly connected to the connecting shaft (3 4), the connecting shaft (34) passes through the bottom of the main magnetizing structure (1), a sleeve shaft (33) is sleeved on the outside of the connecting shaft (34), the top of the sleeve shaft (33) is connected to the connecting shaft (34) through a spring (3402), the bottom of the sleeve shaft (33) is fixed to the tray (31), the edge of the tray (31) is provided with a lower latching tooth (3101), the bottom edge of the main magnetizing structure (1) is provided with an upper latching tooth (102) corresponding to the lower latching tooth (3101), and the outside of the tray (31) is provided with a handle (3102) for rotation; A coaxial limiting key (3401) is protruded from the outside of the connecting shaft (34), a through slot (3301) is provided in the sleeve shaft (33), and a limiting slot (3302) cooperating with the limiting key (3401) is provided on the inner side wall of the through slot (3301).

2. The magnetizing structure for a permanent magnet brushless DC (IPM) motor according to claim 1, characterized in that: The magnetization portion of the triangular area is located outside the middle iron core of the two magnetic tiles (401).

3. The magnetizing structure for a permanent magnet brushless DC (IPM) motor according to claim 2, characterized in that: The auxiliary magnetizing structure (2) is a cylindrical structure with an open top, the auxiliary magnetizing heads (201) are centrally symmetrically distributed inside the auxiliary magnetizing structure (2), and the number of the auxiliary magnetizing heads (201) is twice the number of the magnetic tiles (401).

4. The magnetizing structure for a permanent magnet brushless DC (IPM) motor according to claim 3, characterized in that: The auxiliary magnetizing head (201) contacts one side of the magnetic tile (401).

5. The magnetizing structure for a permanent magnet brushless DC (IPM) motor according to claim 1, characterized in that: The main magnetizing structure (1) is a cylindrical structure with an open top, and the main magnetizing heads (101) are centrally symmetrically distributed inside the main magnetizing structure (1), and the number of the main magnetizing heads (101) is twice the number of the magnetic tiles (401).

6. A magnetizing method for a permanent magnet brushless DC (IPM) motor, characterized by: The magnetization structure according to any one of claims 1 to 5 comprises the following steps: A magnetizing voltage is provided to the main magnetizing structure (1) through the first circuit, and the main magnetizing head (101) faces the magnetizing portion of the iron core between the two magnetic tiles (401); A magnetizing voltage is provided to the auxiliary magnetizing structure (2) through a second circuit, and the auxiliary magnetizing head (201) faces the magnetizing portion of the iron core between the two magnetic tiles (401) and is located inside the main magnetizing structure (1); The first circuit and the second circuit are started simultaneously during the magnetization process.

7. The magnetizing method for a permanent magnet brushless DC (IPM) motor according to claim 6, characterized in that: The first circuit and the second circuit share the same power supply system.

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