Short secondary moving-magnet permanent magnet linear motor

Abstract

The application discloses a short secondary moving-magnetic type permanent magnet linear motor, which comprises a coil framework, an armature coil and a magnetic conducting core, the three components form a unit module, a plurality of unit modules are sequentially arranged and connected to form a primary assembly, slide rods are arranged on both sides of the primary assembly, a secondary assembly seat is arranged on the primary assembly and the slide rods, the secondary assembly is internally provided with double-side secondary assemblies and a position detection magnetic steel assembly, sliding shaft sleeves are further arranged at both ends of the secondary assembly seat, and left and right mounting seats are arranged at the left and right ends of the slide rods respectively; the scheme cancels the design of a drag chain, is simple in structure, smaller in installation space and high in transmission efficiency; no yoke part exists in the primary assembly, the coil arrangement space is enlarged, and the overall weight is reduced; the primary assembly is arranged in the middle of the double-side secondary assemblies, so that the double-side magnetic pulling force borne by the double-side secondary assemblies is balanced, the loss and noise caused by vibration and abrasion are effectively reduced, and the motor performance is improved.

Description

Technical Field

[0001] This invention relates to linear motors, and more specifically to a short secondary moving magnet permanent magnet linear motor. Background Technology

[0002] Currently, mainstream linear motors typically employ a single-sided structure, resulting in unbalanced magnetic pull on the secondary components. Furthermore, most current linear motors utilize a moving-coil design, where the coil acts as the mover and the magnet as the stator. Consequently, the secondary components are usually powered by a cable chain. The presence of the cable chain complicates the motor's structural design, increases the difficulty of linear motor placement, and shortens its lifespan, making it unsuitable for applications in urban rail vehicle door systems.

[0003] In addition, current linear motors typically have a yoke, which compresses the installation space of the armature winding, resulting in problems such as high cost, heavy weight, and low induction density. Summary of the Invention

[0004] Purpose of the invention: The purpose of this invention is to provide a short secondary moving magnet permanent magnet linear motor with no drag chain, no yoke in the primary component, low cost, light weight, and high performance.

[0005] Technical Solution: The short secondary moving magnet permanent magnet linear motor of the present invention includes a coil frame, an armature coil, and a magnetic core. The coil frame, armature coil, and magnetic core constitute a unit module. Multiple unit modules are arranged and connected in sequence to form a primary assembly. Slide rods are provided on both sides of the primary assembly. Hall element plates are provided inside the slide rods. Secondary assembly seats are provided on the primary assembly and the slide rods. The secondary assembly seats contain a double-sided secondary assembly and a position detection magnet assembly. Sliding bushings are also provided at both ends of the secondary assembly seats. Left and right mounting seats are provided at the left and right ends of the slide rods, respectively. A motor control assembly is provided on the right mounting seat. The motor control assembly is connected to the output wire of the primary assembly.

[0006] Compared with existing technologies, the above technical solution eliminates the drag chain design, resulting in a simpler structure, smaller installation space, and higher transmission efficiency. The primary component does not have a yoke, which expands the coil arrangement space and reduces the overall weight. The primary component is located in the middle of the two-sided secondary components, which balances the magnetic pull on both sides of the secondary components, effectively reducing losses and noise caused by vibration and wear, and improving motor performance.

[0007] Preferably, both the left and right mounting bases are equipped with stops to prevent the secondary components from directly colliding with the left and right mounting bases.

[0008] Preferably, the front of the secondary component holder is provided with a slide groove, and a connector is provided in the slide groove, so that the operator can easily fix the connector at any position in the slide groove.

[0009] Preferably, multiple unit modules are encapsulated into primary components using non-magnetic materials, which allows for more precise positioning of components, higher accuracy, and better motor performance.

[0010] Preferably, the secondary component holder is directly stretched from a profile, which has higher precision than the assembled split secondary component, effectively improving the performance of the linear motor and reducing the manufacturing and installation costs of the linear motor.

[0011] Preferably, there is an equidistant air gap between the bilateral secondary components and the primary components, which can further maintain the balance of bilateral magnetic pull.

[0012] Preferably, a beveled slot is provided at one corner of the coil frame, which facilitates the winding in and out of the coil and the connection between armature coils.

[0013] Preferably, the Hall element plate and the position detection magnet assembly are located on the same side.

[0014] Preferably, the bilateral secondary assembly consists of permanent magnets bonded to a magnetically conductive backplate, wherein adjacent permanent magnets are magnetized in opposite directions.

[0015] Beneficial effects: Compared with the prior art, the present invention has the following advantages: 1. It is designed with a drag chain-free structure, which has a small installation space and high transmission efficiency; 2. It is designed with a yoke-free primary component, which expands the coil arrangement space and reduces weight and cost; 3. The primary component is located in the middle of the two-sided secondary components, which maintains the balance of the two-sided magnetic pull, reduces the loss and noise caused by vibration and friction, and improves the motor performance. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the linear motor in this invention;

[0017] Figure 2 This is a schematic diagram of the structure of the primary component unit module in this invention;

[0018] Figure 3 This is a schematic diagram of the structure of the secondary component in this invention. Detailed Implementation

[0019] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0020] like Figures 1 to 3As shown, the short-secondary moving-magnet permanent magnet linear motor includes a unit module consisting of a coil frame 1, an armature coil 2, and a magnetic core 3. Multiple unit modules are arranged and connected in sequence to form a primary assembly. The bilateral secondary assembly 4 consists of permanent magnets bonded to a magnetic backplate, with adjacent permanent magnets magnetized in opposite directions. Specifically, the primary assembly is formed by encapsulation using a dedicated potting mold, with the potting material being a non-magnetic material such as epoxy resin.

[0021] Slide rods 12 are first provided on both sides of the primary component, which are also attached to both sides of the primary component by potting fixtures to form guide rails for the double-sided secondary component 4. The slide rods 12 are provided with grooves, and Hall element plates 9 are installed in the grooves.

[0022] The secondary component holder 5 is directly stretched from a profile, and is hollow, fitting onto two sliding rods 12. The dual-sided secondary components 4 are screwed into grooves in the inner wall of the secondary component holder 5. The secondary component holder 5 also contains a position detection magnet assembly 8, which is located on the same side as the Hall element board 9. Equal-distance air gaps are maintained between the dual-sided secondary components 4 and the primary components.

[0023] Sliding bushings 11 are provided on the upper and lower sides of both ends of the secondary component seat 5, which can reduce the vibration when the secondary component moves. A left mounting seat 6 and a right mounting seat 7 are provided on the left and right ends of the slide rod 12, respectively. The right mounting seat 7 is equipped with a motor control component 13, which is connected to the primary component.

[0024] Stops are also provided in the two mounting bases to prevent the secondary components from directly colliding with the left and right mounting bases. A connector 10 is provided in the external slide groove of the secondary component base 5, which can be fixed at any position in the slide groove.

[0025] Therefore, after the primary component of the linear motor is energized under the control of the motor control component 13, a lateral electromagnetic thrust is generated between the primary component and the bilateral secondary components 4. The secondary components move laterally under the action of the lateral electromagnetic thrust, thereby driving the connector 10 on the secondary component seat 5 to move left and right.

[0026] In addition, a slanted groove is provided at one corner of the coil frame 1, which facilitates the winding and unwinding of the coil and the connection between armature coils. There are also two potting ports on the coil frame 1, which can better bond the coil frame 1, the armature coil 2, and the magnetic core 3 during potting.

[0027] Two wire threaded sleeves can also be installed on the four smaller surfaces of the two mounting bases, which makes it easy to fix the linear motor in multiple positions.

Claims

1. A short-secondary moving magnet permanent magnet linear motor, comprising a coil frame (1), an armature coil (2), and a magnetic core (3), characterized in that, The coil frame (1), armature coil (2) and magnetic core (3) constitute a unit module. Multiple unit modules are arranged and connected in sequence to form a primary component. A slide rod (12) is provided on both sides of the primary component. A Hall element plate (9) is provided inside the slide rod (12). A secondary component seat (5) is provided on the primary component and the slide rod (12). A double-sided secondary component (4) and a position detection magnet assembly (8) are provided inside the secondary component seat (5). The Hall element plate (9) and the position detection magnet assembly (8) are located on the same side. The double-sided secondary component (4) is composed of permanent magnets bonded to a magnetic back plate, wherein the magnetization directions of adjacent permanent magnets are opposite. A sliding bushing (11) is also provided at both ends of the secondary component seat (5). A left mounting seat (6) and a right mounting seat (7) are provided at the left and right ends of the slide rod (12), respectively. A motor control assembly (13) is provided on the right mounting seat (7). The motor control assembly (13) is connected to the output wire of the primary component.

2. The short-secondary moving magnet permanent magnet linear motor according to claim 1, characterized in that, Both the left mounting base (6) and the right mounting base (7) are equipped with stop blocks.

3. The short-secondary moving magnet permanent magnet linear motor according to claim 1, characterized in that, The secondary component seat (5) has a groove on its front side, and a connector (10) is provided in the groove.

4. The short-secondary moving magnet permanent magnet linear motor according to claim 1, characterized in that, Multiple unit modules are encapsulated into primary components using non-magnetic materials.

5. The short-secondary moving magnet permanent magnet linear motor according to claim 1, characterized in that, The secondary component seat (5) is formed by directly stretching a profile.

6. The short-secondary moving magnet permanent magnet linear motor according to claim 1, characterized in that, The bilateral secondary component (4) and the primary component have an equidistant air gap.

7. The short-secondary moving magnet permanent magnet linear motor according to claim 1, characterized in that, The coil frame (1) has a slanted groove at one corner.

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