A U-shaped linear motor

Abstract

The present invention belongs to the field of linear motors, and more specifically, it is a U-shaped linear motor, which includes a housing main body, end covers, a cover plate, a motor stator core, a motor rotor core, motor coils, a motor shaft, a sliding seat, a brake assembly and a plurality of permanent magnets. The brake assembly is installed at the top of the sliding seat, and the brake assembly includes a brake coil; when the brake coil is de-energized, a braking force is formed between the brake assembly and the bottom surface of the cover plate; when the brake coil is energized, the brake assembly releases the braking force with the bottom surface of the cover plate. The present invention provides an electromagnetic device, namely a linear motor, with a simple structure, high efficiency, flexible rotor movement, low manufacturing cost, without the need for other transmission devices, capable of directly pushing a load at the end of the motor shaft to perform continuous linear motion, and with adjustable speed. The motor structure of the present invention replaces the braking method of the traditional linear motor that uses the reverse magnetic field force generated by a large current, and with an innovative braking method of the brake assembly, it can achieve arbitrary braking, thereby increasing the service life of the motor.

Description

Technical Field

[0001] The present invention belongs to the field of linear motors, and more particularly to a U-shaped linear motor. Background Art

[0002] Currently, for power presses, plate shears, air compressors, etc., their power sources are generally in the form of rotational power, such as the rotational form of a rotary motor or a fuel-powered machine, which is changed into a linear reciprocating motion through a crankshaft, connecting rod, and lead screw nut. Their structures are complex, requiring high machining precision, having low power, and having a relatively high failure rate.

[0003] Although there are currently linear motors that can directly convert electrical energy into linear motion mechanical energy without any intermediate conversion mechanism, currently traditional linear motors use the reverse magnetic field force generated by large currents for braking, resulting in a relatively low service life. Summary of the Invention

[0004] Aiming at the problem that traditional linear motors use the reverse magnetic field force generated by large currents for braking and have a relatively low service life, the purpose of the present invention is to provide a U-shaped linear motor that can achieve arbitrary braking with an innovative brake assembly braking method.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] A U-shaped linear motor includes a housing and a motor stator core, a motor rotor core, a motor coil, a motor shaft, a sliding seat, a brake assembly, and a magnet respectively accommodated in the housing.

[0007] The interior of the housing is an installation chamber, the motor stator core is installed in the installation chamber, and a coil installation groove for passing the motor coil is provided on the inner side surface of the motor stator core.

[0008] The top of the sliding seat is slidably connected to the housing, the lower part of the sliding seat extends to the inner side of the motor stator core, the lower inner side of the sliding seat is provided with the motor rotor core, and a plurality of magnets are installed on the bottom surface of the motor rotor core along the length direction; the motor shaft is installed in the housing so as to be relatively movable along the length direction, and both ends of the motor shaft respectively pass through the housing, and the motor shaft respectively passes through the motor rotor core and the sliding seat and is linked with the motor rotor core and the sliding seat.

[0009] A brake assembly is installed at the top of the sliding seat. The brake assembly forms a brake with the housing when the brake assembly is powered off, and releases the brake with the housing when the brake assembly is powered on.

[0010] The radial cross-sectional shape of the motor stator core is U-shaped.

[0011] The housing includes a housing body, end covers and a cover plate. The end covers are respectively installed at both ends of the housing body in the length direction. The top of the housing body is open and the cover plate is installed thereon. Both ends of the motor shaft pass through the end covers.

[0012] The top of the sliding seat is slidably connected to the lower surface of the cover plate. The axial direction of the motor shaft is the same as the length direction of the housing body, and the axial center line of the motor shaft is parallel or collinear with the length direction center line of the housing body. Linear bearings for supporting the motor shaft are provided inside each of the end covers.

[0013] A gasket is provided between the end cover and the end face of the housing body, and sealing rings are provided at the positions where the motor shaft passes through the end covers.

[0014] Guide rail A is provided on the bottom surface of the cover plate. The length direction of the guide rail A is parallel to the length direction of the housing body. A slider A slidably connected to the guide rail A is provided at the top of the sliding seat.

[0015] The middle part of the motor shaft passes through the motor rotor core and the sliding seat. Locking nuts are respectively threadedly connected to the parts of the motor shaft located outside both ends of the sliding seat in the length direction. The motor shaft is fixed to the motor rotor core and the sliding seat through the locking nuts.

[0016] The brake assembly includes a brake coil, a main brake assembly bracket, a brake stator, an armature, a spring, and two groups of cooperating swing rods, friction plate mounting seats and friction plates.

[0017] The main brake assembly bracket is installed at the top of the sliding seat. Hinged ends are respectively convexly provided upward at both ends of the main brake assembly bracket. The middle parts of each group of swing rods are respectively hinged to a corresponding hinged end. One end of each group of swing rods is respectively hinged to the friction plate mounting seat of the same group. Friction plates are respectively provided on the top surfaces of each group of friction plate mounting seats. A long groove is respectively provided at the other end of each group of swing rods. The brake stator is installed on the main brake assembly bracket between the two hinged ends. The brake coil is installed on the brake stator. The armature is located between the brake stator and the main brake assembly bracket. Linkage pins are respectively provided at both ends of the armature in the length direction. Each linkage pin respectively passes through the long groove of a neighboring swing rod. A plurality of springs are provided between the brake stator and the armature.

[0018] A limiting plate is further provided between the armature and the main brake assembly bracket. A plurality of threaded connection sleeves are provided on the limiting plate. Each of the plurality of threaded connection sleeves respectively passes through the armature. Connection screws are respectively provided at the positions on the brake stator corresponding to the threaded connection sleeves. Each connection screw is respectively threadedly connected to the corresponding threaded connection sleeve.

[0019] On the outer side surface of the brake stator, a plurality of guide rails B are provided, and sliders B slidably connected to the respective guide rails B are provided on the armature.

[0020] The advantages and positive effects of the present invention are as follows:

[0021] 1. The present invention provides an electromagnetic device, namely a linear motor, which has a simple structure, high efficiency, flexible rotor movement, low manufacturing cost, does not require other transmission devices, can directly push a load at the end of the motor shaft to perform continuous linear motion, and has adjustable speed.

[0022] 2. The motor structure of the present invention cancels the braking method of using the reverse magnetic field force generated by a large current in a traditional linear motor, and adopts an innovative brake assembly for braking, which can be braked arbitrarily, increasing the service life of the motor.

[0023] 3. The parts of the present invention have a high degree of interchangeability and can be lengthened arbitrarily according to user needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is one of the schematic diagrams of the overall internal structure of the present invention;

[0025] Figure 2 is the schematic diagram of the setting structure of the housing main body and the motor stator core of the present invention;

[0026] Figure 3 is the second of the schematic diagrams of the overall internal structure of the present invention;

[0027] Figure 4 is the schematic diagram of the structure of the brake assembly of the present invention.

[0028] In the figure: 1 is the housing main body, 2 is the end cover, 3 is the cover plate, 4 is the motor stator core, 5 is the motor rotor core, 6 is the motor coil, 7 is the motor shaft, 8 is the sliding seat, 9 is the permanent magnet, 10 is the brake coil, 11 is the linear bearing, 12 is the gasket, 13 is the sealing ring, 14 is the guide rail A, 15 is the slider A, 16 is the locking nut, 17 is the main bracket of the brake assembly, 18 is the brake stator, 19 is the armature, 20 is the spring, 21 is the swing rod, 22 is the friction plate mounting seat, 23 is the friction plate, 24 is the limit plate, 25 is the threaded connecting sleeve, 26 is the connecting screw, 27 is the guide rail B, 28 is the slider B. DETAILED DESCRIPTION OF THE INVENTION

[0029] The following further details the present invention in conjunction with the attached Figures 1-4 drawings.

[0030] A U-shaped linear motor, as Figures 1-4As shown in the figure, this embodiment includes a housing and a motor stator core 4, a motor rotor core 5, a motor coil 6, a motor shaft 7, a sliding seat 8, a brake assembly, and a magnet 9 respectively accommodated in the housing.

[0031] The interior of the housing is an installation chamber. The motor stator core 4 is installed in the installation chamber. A coil installation groove for passing through the motor coil 6 is provided on the inner side surface of the motor stator core 4. In this embodiment, the setting structure of the motor coil 6 and the coil installation groove adopts the prior art, and the motor coil 6 is controlled to be powered on and off by an external control system. In this embodiment, the radial cross-sectional shape of the motor stator core 4 is U-shaped.

[0032] The top of the sliding seat 8 is slidably connected to the housing. The lower part of the sliding seat 8 extends to the inner side of the motor stator core 4. A motor rotor core 5 is installed on the inner side of the lower part of the sliding seat 8. A plurality of magnets 9 are installed on the bottom surface of the motor rotor core 5 along the length direction. The setting structure of the motor rotor core 5 and the magnet 9 adopts the prior art. The thrust of the linear motor can be obtained by adjusting the cross-sectional area of the motor rotor core 5. The motor shaft 7 is installed in the housing so as to be relatively movable along the length direction, and both ends of the motor shaft 7 penetrate through the housing respectively. The motor shaft 7 passes through the motor rotor core 5 and the sliding seat 8 respectively and is interlocked with the motor rotor core 5 and the sliding seat 8.

[0033] A brake assembly is installed at the top of the sliding seat 8. The brake assembly forms a brake with the housing when the brake assembly is powered off, and releases the brake with the housing when the brake assembly is powered on.

[0034] Specifically, in this embodiment, the housing includes a housing main body 1, end covers 2, and a cover plate 3. End covers 2 are respectively installed at both ends of the housing main body 1 in the length direction. The top of the housing main body 1 is open and is installed with a cover plate 3 by screws; both ends of the motor shaft 7 penetrate through the end covers 2 respectively. The top of the sliding seat 8 is slidably connected to the lower surface of the cover plate 3. The axial direction of the motor shaft 7 is the same as the length direction of the housing main body 1, and the axial center line of the motor shaft 7 is parallel or collinear with the length direction center line of the housing main body 1. In this embodiment, the housing main body 1 equipped with the motor stator core 4 can also be connected to the same housing main body 1 to increase the overall length according to the usage requirements, and the modularity is high. The motor shaft 7 can be replaced with a motor shaft 7 of different lengths according to the usage requirements of the stroke. When the motor coil 6 is powered on, the magnetic force pushes the motor rotor core 5 and the sliding seat 8 to perform a linear motion inside the motor stator core 4, and makes the motor shaft 7 output a linear motion; when the motor coil 6 is powered off, the motor rotor core 5 and the sliding seat 8 stop moving.

[0035] Specifically, linear bearings 11 for supporting the motor shaft 7 are provided on the inner sides of the end covers 2 in this embodiment. The linear bearings 11 in this embodiment are commercially available products. The linear bearings 11 play a supporting role for the motor shaft 7, enabling the motor shaft 7 to stably move axially.

[0036] Specifically, a gasket 12 is provided between the end face of the end cover 2 and the end face of the housing body 1 in this embodiment, and a sealing ring 13 is provided at each position where the motor shaft 7 passes through the end cover 2. The provision of the gasket 12 and the sealing ring 13 can prevent dust and water mist from the outside from entering the motor interior and corroding the motor.

[0037] Specifically, two guide rails A14 are provided on the bottom surface of the cover plate 3 in this embodiment. The length direction of each guide rail A14 is parallel to the length direction of the housing body 1, and a slider A15 slidably connected to the guide rail A14 is provided at the top end of the sliding seat 8. The provision of the guide rail A14 and the slider A15 enables the sliding seat 8 to slide stably.

[0038] Specifically, the middle part of the motor shaft 7 passes through the motor rotor core 5 and the sliding seat 8 in this embodiment. Locking nuts 16 are respectively threadedly connected to the parts of the motor shaft 7 located outside the two ends in the length direction of the sliding seat 8. The motor shaft 7 is fixed to the motor rotor core 5 and the sliding seat 8 through the locking nuts 16, which is convenient for disassembly and assembly.

[0039] Specifically, the brake assembly in this embodiment includes a brake coil 10, a main brake assembly bracket 17, a brake stator 18, an armature 19, a spring 20, and two groups of cooperating swing rods 21, friction plate mounting seats 22, and friction plates 23. The friction plate 23 in this embodiment is a commercially available product.

[0040] The main brake assembly bracket 17 is installed at the top end of the sliding seat 8. Hinge ends are respectively convexly provided upward at both ends of the main brake assembly bracket 17. The middle parts of each group of swing rods 21 are respectively hinged to a corresponding hinge end. One end of each group of swing rods 21 is respectively hinged to the friction plate mounting seat 22 of the same group. Friction plates 23 are respectively provided on the top surfaces of each group of friction plate mounting seats 22. A long groove is respectively formed at the other end of each group of swing rods 21. The brake stator 18 is installed on the main brake assembly bracket 17 between the two hinge ends. The brake coil 10 is installed on the brake stator 18. The armature 19 is located between the brake stator 18 and the main brake assembly bracket 17. Link pins are respectively provided at both ends in the length direction of the armature 19. Each link pin respectively passes through the long groove of a neighboring swing rod 21. A plurality of springs 20 are provided between the brake stator 18 and the armature 19. When the brake coil 10 is de-energized, the spring 20 provides pressure to the armature 19 to separate the armature 19 from the brake stator 18. At this time, the friction plate 23 is separated from the bottom surface of the cover plate 3 to generate a gap, so that the motor is released from braking; when the brake coil 10 is energized, the brake stator 18 generates a magnetic field to attract the armature 19 and compress the spring 20. The two ends of the armature 19 respectively drive the swing rod

[0041] Specifically, in this embodiment, a limiting plate 24 is further provided between the armature 19 and the main bracket 17 of the brake assembly. A number of threaded connection sleeves 25 are provided on the limiting plate 24. Each of the threaded connection sleeves 25 passes through the armature 19 respectively. Connection screws 26 are provided at positions corresponding to the threaded connection sleeves 25 on the brake stator 18 respectively. Each connection screw 26 is threadedly connected to the corresponding threaded connection sleeve 25. The limiting plate 24 functions to block the armature 19 and prevent the armature 19 from separating from the brake stator 18. By providing the connection screws 26 and the threaded connection sleeves 25, the gap size between the limiting plate 24 and the brake stator 18 can be adjusted.

[0042] Specifically, in this embodiment, a number of guide rails B 27 are provided on the outer side surface of the brake stator 18. The length directions of the guide rails B 27 are all perpendicular to the plane where the cover plate 3 is located. Sliders B 28 slidably connected to the guide rails B 27 are respectively provided on the armature 19. The provision of the guide rails B 27 and the sliders B 28 enables the armature 19 to move up and down stably.

[0043] Working principle:

[0044] When the motor coil 6 is energized, the magnetic force pushes the motor rotor core 5 and the sliding seat 8 to perform a linear motion inside the motor stator core 4, and the motor shaft 7 outputs a linear motion; when the motor coil 6 is de-energized, the motor rotor core 5 and the sliding seat 8 stop moving; when the brake coil 10 is de-energized, the spring 20 provides pressure to the armature 19, separating the armature 19 from the brake stator 18. At this time, the friction plate 23 separates from the bottom surface of the cover plate 3 and a gap is generated, relaxing the braking of the motor; when the brake coil 10 is energized, the brake stator 18 generates a magnetic field to attract the armature 19 and compress the spring 20. The two ends of the armature 19 drive the swing rods 21 to swing respectively, causing the friction plate 23 to press against the bottom surface of the cover plate 3, achieving the braking effect of the motor; the brake coil 10 and the motor coil 6 are energized or de-energized simultaneously, enabling the sliding seat 8 provided with the brake assembly to stop and achieve braking at any time, and relaxing the braking simultaneously when moving.

Claims

1. A U-shaped linear motor, characterized in that: It includes a housing and a motor stator core (4), a motor rotor core (5), a motor coil (6), a motor shaft (7), a sliding seat (8), a brake assembly, and a magnet (9) respectively accommodated in the housing; The interior of the housing is an installation chamber, the motor stator core (4) is installed in the installation chamber, and a coil installation groove for passing through the motor coil (6) is provided on the inner side surface of the motor stator core (4); The top of the sliding seat (8) is slidably connected to the housing, the lower part of the sliding seat (8) extends to the inner side of the motor stator core (4), the motor rotor core (5) is installed on the inner side of the lower part of the sliding seat (8), and a plurality of magnets (9) are installed on the bottom surface of the motor rotor core (5) along the length direction; the motor shaft (7) is installed in the housing so as to be relatively movable along the length direction, and both ends of the motor shaft (7) respectively pass through the housing, and the motor shaft (7) respectively passes through the motor rotor core (5) and the sliding seat (8) and is linked with the motor rotor core (5) and the sliding seat (8); A brake assembly is installed at the top of the sliding seat (8), the brake assembly forms a brake with the housing when the brake assembly is powered off, and the brake assembly releases the brake with the housing when the brake assembly is powered on; The brake assembly includes a brake coil (10), a main brake assembly bracket (17), a brake stator (18), an armature (19), a spring (20), and two groups of cooperatively arranged swing rods (21), friction plate mounting seats (22), and friction plates (23); The main brake assembly bracket (17) is installed at the top of the sliding seat (8), hinge ends are respectively convexly provided upward at both ends of the main brake assembly bracket (17), the middle parts of each group of swing rods (21) are respectively hinged to a corresponding hinge end, one end of each group of swing rods (21) is respectively hinged to the friction plate mounting seat (22) of the same group, the friction plates (23) are respectively provided on the top surfaces of each group of friction plate mounting seats (22), a long groove is respectively opened at the other end of each group of swing rods (21), the brake stator (18) is installed on the main brake assembly bracket (17) between the two hinge ends, the brake coil (10) is installed on the brake stator (18), the armature (19) is located between the brake stator (18) and the main brake assembly bracket (17), linkage pin shafts are respectively provided at both ends of the armature (19) in the length direction, and each linkage pin shaft respectively passes through the long groove of a neighboring swing rod (21), and a plurality of springs (20) are provided between the brake stator (18) and the armature (19).

2. The U-shaped linear motor according to claim 1, wherein: The radial cross-sectional shape of the motor stator core (4) is U-shaped.

3. The U-shaped linear motor according to claim 1, characterized in that: The housing includes a housing main body (1), end covers (2), and a cover plate (3), the end covers (2) are respectively installed at both ends of the housing main body (1) in the length direction, the top of the housing main body (1) is open and the cover plate (3) is installed; both ends of the motor shaft (7) respectively pass through the end covers (2).

4. The U-shaped linear motor according to claim 3, characterized in that: The top of the sliding seat (8) is slidably connected to the lower surface of the cover plate (3). The axial direction of the motor shaft (7) is the same as the length direction of the housing body (1), and the axial center line of the motor shaft (7) is parallel or collinear with the length direction center line of the housing body (1). Linear bearings (11) for supporting the motor shaft (7) are provided on the inner sides of the end covers (2).

5. The U-shaped linear motor according to claim 3, wherein: A gasket (12) is provided between the end cover (2) and the end face of the housing body (1), and sealing rings (13) are provided at the positions where the motor shaft (7) passes through the end cover (2).

6. The U-shaped linear motor according to claim 3, characterized in that: A guide rail A (14) is provided on the bottom surface of the cover plate (3). The length direction of the guide rail A (14) is parallel to the length direction of the housing body (1). A slider A (15) slidably connected to the guide rail A (14) is provided at the top end of the sliding seat (8).

7. The U-shaped linear motor according to claim 1, wherein: The middle part of the motor shaft (7) passes through the motor rotor core (5) and the sliding seat (8). Locking nuts (16) are respectively threadedly connected to the parts of the motor shaft (7) located outside the two ends in the length direction of the sliding seat (8). The motor shaft (7) is fixed to the motor rotor core (5) and the sliding seat (8) by the locking nuts (16).

8. The U-shaped linear motor according to claim 1, characterized in that: A limiting plate (24) is further provided between the armature (19) and the main bracket (17) of the brake assembly. A number of threaded connection sleeves (25) are provided on the limiting plate (24). Each of the threaded connection sleeves (25) passes through the armature (19) respectively. Connecting screws (26) are respectively provided at the positions corresponding to the threaded connection sleeves (25) on the brake stator (18). Each of the connecting screws (26) is threadedly connected to the corresponding threaded connection sleeve (25).

9. The U-shaped linear motor according to claim 1, wherein: A number of guide rails B (27) are provided on the outer side surface of the brake stator (18). Sliders B (28) slidably connected to the guide rails B (27) are respectively provided on the armature (19).

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