Permanent magnet mounting fixture for outer rotor brushless motor and mounting method thereof

Abstract

A mounting fixture for the permanent magnet of an outer rotor brushless motor and an mounting method thereof, comprising a magnet assembly fixture and a magnet positioning shaft; wherein the magnet positioning shaft is used to fix the magnet, and comprises a spring, a push rod, a cover plate, a screw, a handle and a bevel block, wherein the spring is used to keep the push rod in a reset state; the handle is installed on the push rod, and the handle is used to keep the pressure of the push rod on the bevel block in a locked position; the magnet assembly fixture is used to assemble the magnet and the yoke.

Description

Technical Field

[0001] The invention relates to the design and application of a brushless motor, and in particular to a permanent magnet mounting fixture for an outer rotor type brushless DC motor and a mounting method thereof. Background Art

[0002] The brushless DC motors used in light and small drones are mostly separated from the inner rotor. When the propeller is damaged or destroyed by the wing tip, the torque of the outer rotor is unbalanced, causing the torque imbalance of the outer rotor of the brushless DC motor, causing the magnet to be damaged or the outer rotor and the inner stator to be mechanically worn, resulting in the motor being unusable, and the maintenance and replacement costs are high; when the dynamic balance and static balance of the propeller are poorly consistent or the overall performance is poor, the torque of the outer rotor is unbalanced, causing the torque imbalance of the outer rotor of the brushless DC motor, causing the magnet to be damaged or the outer rotor and the inner stator to be mechanically worn, resulting in the motor being unusable, and the maintenance and replacement costs are high. When the weight, bending stiffness and torsional stiffness of the propeller are poorly consistent or the overall performance is poor, the instantaneous increase or decrease of the throttle causes the torque imbalance of the outer rotor, causing the torque imbalance of the outer rotor of the brushless DC motor, causing the magnet to be damaged or the outer rotor and the inner stator to be mechanically worn, resulting in the motor being unusable, and the maintenance and replacement costs are high.

[0003] Patent document No. 201720561054 discloses a brushless DC motor, characterized in that it includes a propeller pre-tightening screw, a propeller pre-tightening gasket, a propeller mounting gasket, a top cover, a top cover pre-tightening screw, an outer rotor housing, an outer rotor magnet, an outer rotor main shaft, an inner stator, an inner stator base, a limit control bearing, a bottom cover pre-tightening screw, an anti-dropping limit block and a transition metal part; the top cover is provided with a turbofan structure, the top cover and the outer rotor housing are screwed and installed by the top cover pre-tightening screw, and the outer rotor main shaft is locked by the propeller pre-tightening screw after matching the top cover aperture A propeller preload gasket and a propeller mounting gasket are arranged downward in sequence between the propeller preload screw and the top cover; the outer rotor magnet is embedded in the concave-convex groove on the top cover and glued, and the two form a rigid body; the outer rotor main shaft is installed on the inner stator through aperture matching, and the inner stator base is installed on the bottom of the inner stator; the inner ring aperture of the limit control bearing is matched and installed on the inner stator base; the outer ring of the limit control bearing is matched with the inner ring aperture of the transition metal part, and is threadedly connected through the bottom cover preload screw, and the anti-drop limit block is matched with the aperture of the outer rotor main shaft, and is installed at the bottom of the outer rotor main shaft through the preload screw.

[0004] The inventors have found that the outer rotor type brushless DC motor disclosed in the above technical solution uses glue to glue the permanent magnets one by one to the inner side of the yoke at a certain interval; this method of installing and fixing the permanent magnets has very low production efficiency and accuracy. Summary of the invention

[0005] To solve the above problems, the object of the present invention is to provide a mounting fixture and a mounting method thereof, so as to improve the efficiency and accuracy of mounting the permanent magnets of the outer rotor brushless motor onto the inner side surface of the yoke.

[0006] The technical solution of the present invention is as follows: a permanent magnet installation fixture for an outer rotor brushless motor, characterized in that it includes a magnet assembly fixture and a magnet positioning shaft (6); wherein the magnet positioning shaft is used to fix the magnet (62), and includes a spring (65), a push rod (66), a cover plate (64), a screw (68), a handle (67) and a bevel block (63), wherein the spring is used to keep the push rod in a reset state; the handle is installed on the push rod, and the handle is used to keep the pressure of the push rod on the bevel block in a locked position; the magnet assembly fixture is used to assemble the magnet and the yoke (2).

[0007] Furthermore, the magnet assembly fixture comprises a base plate (1), a positioning block (3), a support plate (4), a vertical plate (5), a panel (7), a guide column (8), a guide sleeve (9), a cylinder connector (10), a second connector (11), a reinforcing rib (12), a limit rod (13), a first pressure block (14), a foot pad (15), a quick clamp (16), a quick clamp bracket (17), a second reinforcing rib (18), a first cylinder (19), a second cylinder (20), a positioning screw (21), a nut (22), a second pressure block (23), a slider (24), a part (25), a solenoid valve switch (26), a switch bracket (27), a straight-through connector (28), a solenoid valve (29), and a torque handle (31). A method for installing a permanent magnet of an outer rotor brushless motor comprises the following steps:

[0008] The magnet is installed into the magnet positioning shaft (6);

[0009] Apply glue to the outer side of the magnet (62);

[0010] Installing the magnet positioning shaft into the magnet assembly fixture and locking the quick clamp (16);

[0011] A magnetic yoke (2) is fixed between the positioning block (3) and the second pressing block (23) to press the torque handle (31);

[0012] The pneumatic source switch is turned on, the first cylinder (19) pushes the support plate (4) downward, and the positioning screw (21) is used to position the height of the magnet positioning shaft. When the positioning screw reaches the set height, it means that the magnet on the magnet positioning shaft reaches the predetermined installation height; at this time, the limit rod (13) triggers the solenoid valve switch (26), and the solenoid valve (29) connects to the air source of the second cylinder (20);

[0013] The second cylinder (20) pushes the push rod (66) in the magnet positioning shaft (6), presses the magnet (62) against the magnetic yoke (2), and twists the handle (67) into a locking position;

[0014] By pressing the air source switch, the first air cylinder (19) and the second air cylinder (20) are reset, and the magnet positioning shaft (6) is removed.

[0015] Furthermore, the method further comprises the following step: placing the magnet positioning shaft (6) into an oven to solidify the glue.

[0016] The beneficial effects of the present invention are as follows: the present invention creatively designs and invents a permanent magnet mounting fixture and a mounting method for an outer rotor brushless motor, which greatly improves the production efficiency and precision of permanent magnet mounting. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the magnet positioning shaft of the present invention;

[0018] Figure 2 A schematic top view of the magnet positioning shaft of the present invention;

[0019] Figure 3 It is a cross-sectional schematic diagram of the magnet positioning shaft of the present invention;

[0020] Figure 4 It is a structural schematic diagram of the magnet positioning shaft of the present invention when it is installed into the magnet assembly fixture;

[0021] Figure 5 It is a schematic structural diagram of the magnet positioning shaft of the present invention after the height is positioned;

[0022] Figure 6 It is a schematic diagram of the structure of the present invention when pressing and locking the magnet.

[0023] In the figure, 1, bottom plate; 2, yoke; 3, positioning block; 4, support plate; 5, vertical plate; 6, magnet positioning shaft; 7, panel; 8, guide column; 9, guide sleeve; 10, cylinder connecting piece; 11, second connecting piece; 12, reinforcing rib; 13, limit rod; 14, first pressure block; 15, foot pad; 16, quick clamp; 17, quick clamp bracket; 18, second reinforcing rib; 19, first cylinder; 20, second cylinder; 21, positioning screw; 22, nut; 23, second pressure block; 24, slider; 25, parts; 26, solenoid valve switch; 27, switch bracket; 28, straight-through connector; 29, solenoid valve; 31, torque handle; 62, magnet; 63, oblique block; 64, cover plate; 65, second spring; 66, push rod; 67, handle; 68, screw. DETAILED DESCRIPTION

[0024] The technical solution of the present invention is described in detail below in conjunction with the accompanying drawings and embodiments.

[0025] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, a permanent magnet mounting fixture for an outer rotor brushless motor is characterized in that it includes a magnet assembly fixture and a magnet positioning shaft (6); wherein the magnet positioning shaft is used to fix the magnet (62), and includes a spring (65), a push rod (66), a cover plate (64), a screw (68), a handle (67) and a bevel block (63), wherein the spring is used to keep the push rod in a reset state; the handle is installed on the push rod, and the handle is used to keep the pressure of the push rod on the bevel block in a locked position; the magnet assembly fixture is used to assemble the magnet and the yoke (2).

[0026] Furthermore, the magnet assembly fixture comprises a base plate (1), a positioning block (3), a support plate (4), a vertical plate (5), a panel (7), a guide column (8), a guide sleeve (9), a cylinder connector (10), a second connector (11), a reinforcing rib (12), a limit rod (13), a first pressure block (14), a foot pad (15), a quick clamp (16), a quick clamp bracket (17), a second reinforcing rib (18), a first cylinder (19), a second cylinder (20), a positioning screw (21), a nut (22), a second pressure block (23), a slider (24), a part (25), a solenoid valve switch (26), a switch bracket (27), a straight-through connector (28), a solenoid valve (29), and a torque handle (31). A method for installing a permanent magnet of an outer rotor brushless motor comprises the following steps:

[0027] The magnet is installed into the magnet positioning shaft (6);

[0028] Apply glue to the outer side of the magnet (62);

[0029] Installing the magnet positioning shaft into the magnet assembly fixture and locking the quick clamp (16);

[0030] A magnetic yoke (2) is fixed between the positioning block (3) and the second pressing block (23) to press the torque handle (31);

[0031] The pneumatic source switch is turned on, the first cylinder (19) pushes the support plate (4) downward, and the positioning screw (21) is used to position the height of the magnet positioning shaft. When the positioning screw reaches the set height, it means that the magnet on the magnet positioning shaft reaches the predetermined installation height; at this time, the limit rod (13) triggers the solenoid valve switch (26), and the solenoid valve (29) connects to the air source of the second cylinder (20);

[0032] The second cylinder (20) pushes the push rod (66) in the magnet positioning shaft (6), presses the magnet (62) against the magnetic yoke (2), and twists the handle (67) into a locking position;

[0033] By pressing the air source switch, the first air cylinder (19) and the second air cylinder (20) are reset, and the magnet positioning shaft (6) is removed.

[0034] Furthermore, the method further comprises the following step: placing the magnet positioning shaft (6) into an oven to solidify the glue.

[0035] The above description only relates to some specific embodiments of the present invention. Any replacement or improvement made by any technician in the field based on the spirit of the present invention should be covered by the protection scope of the present invention, and the protection scope of the present invention should be based on the claims.

Claims

1. A permanent magnet mounting fixture for an outer rotor brushless motor, characterized in that: The invention comprises a magnet assembly fixture and a magnet positioning shaft (6); wherein the magnet positioning shaft is used to fix the magnet (62), comprises a spring (65), a push rod (66), a cover plate (64), a screw (68), a handle (67) and an inclined block (63); the spring is used to keep the push rod in a reset state; the push rod is mounted with the handle, and the handle is used to keep the pressure of the push rod on the inclined block in a locked position; the magnet assembly fixture is used to assemble the magnet and the yoke (2); the magnet assembly fixture comprises a bottom plate (1), a positioning block (3), a support plate (4), a vertical plate (5), a surface plate (66), a vertical plate (67), a vertical plate (68), a vertical plate (69), a vertical plate (7), a vertical plate (8), a vertical plate (9), a vertical plate (10), a vertical plate (11), a vertical plate (12), a vertical plate (13), a vertical plate (14), a vertical plate (15), a vertical plate (16), a vertical plate (17), a vertical plate (18), a vertical plate (19), a vertical plate (20), a vertical plate (21), a vertical plate (22), a vertical plate (23), a vertical plate (24), a vertical plate (25), a vertical plate (26), a vertical plate (27), a vertical plate (28), a vertical plate (29), a vertical plate (30), a vertical plate (31), a vertical plate (32), a vertical plate (33), a vertical plate (34), a vertical plate (35), a vertical plate (36), a vertical plate (37), a vertical plate (38), a vertical plate (39), a vertical plate (44), a vertical plate (5), a vertical plate (56), a vertical plate (57), a vertical plate (58), a vertical plate (59), a vertical plate (69), a vertical plate (61), a vertical plate (62), a vertical plate (63), a vertical plate (64), a vertical plate (65), a vertical plate (66), a A plate (7), a guide column (8), a guide sleeve (9), a cylinder connecting piece (10), a second connecting piece (11), a reinforcing rib (12), a limiting rod (13), a first pressing block (14), a foot pad (15), a quick clamp (16), a quick clamp bracket (17), a second reinforcing rib (18), a first cylinder (19), a second cylinder (20), a positioning screw (21), a nut (22), a second pressing block (23), a slider (24), a part (25), a solenoid valve switch (26), a switch bracket (27), a straight connector (28), a solenoid valve (29), and a torque handle (31); The mounting fixture is installed by the following steps: The magnet is installed into the magnet positioning shaft (6); Apply glue to the outer side of the magnet (62); Installing the magnet positioning shaft into the magnet assembly fixture and locking the quick clamp (16); A magnetic yoke (2) is fixed between the positioning block (3) and the second pressing block (23) to press the torque handle (31); The pneumatic source switch is turned on, the first cylinder (19) pushes the support plate (4) downward, and the positioning screw (21) is used to position the height of the magnet positioning shaft. When the positioning screw reaches the set height, it means that the magnet on the magnet positioning shaft reaches the predetermined installation height; at this time, the limit rod (13) triggers the solenoid valve switch (26), and the solenoid valve (29) connects to the air source of the second cylinder (20); The second cylinder (20) pushes the push rod (66) in the magnet positioning shaft (6), pressing the magnet (62) onto the magnetic yoke (2), and twisting the handle (67) into a locking position; The air source switch is pressed, the first air cylinder (19) and the second air cylinder (20) are reset, and the magnet positioning shaft (6) is removed.

2. The method for installing the permanent magnet mounting fixture of the outer rotor brushless motor according to claim 1, comprising the following steps: The magnet is installed into the magnet positioning shaft (6); Apply glue to the outer side of the magnet (62); Installing the magnet positioning shaft into the magnet assembly fixture and locking the quick clamp (16); A magnetic yoke (2) is fixed between the positioning block (3) and the second pressing block (23) to press the torque handle (31); The pneumatic source switch is turned on, the first cylinder (19) pushes the support plate (4) downward, and the positioning screw (21) is used to position the height of the magnet positioning shaft. When the positioning screw reaches the set height, it means that the magnet on the magnet positioning shaft reaches the predetermined installation height; at this time, the limit rod (13) triggers the solenoid valve switch (26), and the solenoid valve (29) connects to the air source of the second cylinder (20); The second cylinder (20) pushes the push rod (66) in the magnet positioning shaft (6), pressing the magnet (62) onto the magnetic yoke (2), and twisting the handle (67) into a locking position; The air source switch is pressed, the first air cylinder (19) and the second air cylinder (20) are reset, and the magnet positioning shaft (6) is removed.

3. The method for installing a permanent magnet mounting fixture of an outer rotor brushless motor according to claim 2, characterized in that: The method further comprises the following steps: placing the magnet positioning shaft (6) into an oven to solidify the glue.

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