An extremely high power density cylindrical linear motor

Abstract

The present invention discloses an extreme high power density cylindrical linear motor, comprising a frame, a cylindrical primary assembly, a secondary assembly, a connecting piece, a hanging piece and a friction pair sliding piece; the frame comprises a primary mounting assembly, a long strip-shaped beam and a hanging piece; there are two primary mounting assemblies, which are respectively sleeved on the two ends of the primary assembly, the secondary assembly is sleeved in the middle of the primary assembly, and there are two long beams, which are symmetrically mounted on the upper and lower ends of the two primary mounting assemblies; a vertical hollow structure is arranged on the end face of the long beam close to the primary assembly, a horizontal hollow structure is arranged in the middle of the long beam, the hanging piece is embedded in both sides of the long beam, and grooves for placing the friction pair sliding pieces are also provided on the left and right side surfaces of the hanging piece, so that the winding utilization rate is high; the secondary is a cylindrical iron core with an embedded permanent magnet structure, which does not need to be powered by wires, so that it is easy to install and convenient to be hung with an execution structure; the motor has a small volume and weight and has a high thrust density.

Description

Technical Field

[0001] This patent relates to the field of linear motor technology, specifically an extreme high power density cylindrical linear motor. Background Art

[0002] Linear motors can directly generate linear motion without the need for complex mechanical conversion. They have a relatively simple structure, small motion inertia, and fast dynamic response speed. Their application areas are expanding.

[0003] Compared with conventional flat permanent magnet linear motors, cylindrical permanent magnet linear motors have the advantage of high winding utilization because their primary windings are annular windings without end windings. And because of their centrally symmetrical structure, the radial forces offset each other, making it easy to overcome the problem of unilateral magnetic pull. In addition, since there is no lateral disconnection in the cylindrical permanent magnet linear motor, the magnetic field is evenly distributed along the circumference, so it has no lateral edge effect.

[0004] Conventional linear motors have a primary element consisting of a rotor with windings and an iron core. The rotor with windings needs to drag the power supply wires during operation, which is not conducive to high-speed and long-stroke movement. In some situations where there are strict restrictions on thrust, volume, stroke, etc., the traditional primary structure of the rotor can no longer meet the requirements.

[0005] At present, in some occasions with strict requirements on thrust, volume, stroke, etc., the traditional linear propulsion device has great room for improvement, and high power density linear motors provide a new idea for its upgrade. Therefore, it is necessary to develop a cylindrical permanent magnet linear motor with reliable operation, convenient maintenance, short working hours, high thrust density, low cost, compact structure, light weight, and dynamic secondary to meet the needs of special applications. Summary of the invention

[0006] The present invention aims to solve the problem that the existing conventional linear motor has a mover with windings that needs to drag the power supply wire during operation, which is not conducive to its high-speed and long-stroke movement and is difficult to apply in certain occasions with strict restrictions on thrust, volume, stroke, etc.

[0007] In view of the above problems, the technical solution adopted by the present invention is: an extreme high power density cylindrical linear motor, including a frame, a hanging part, a cylindrical primary assembly, a secondary assembly, a connecting part and a friction pair sliding plate; the frame includes a primary mounting assembly, a long strip-shaped long beam and a hanging part; the primary mounting assembly has two components, which are respectively sleeved on the two ends of the cylindrical primary assembly to fix the cylindrical primary assembly; the secondary assembly is sleeved in the middle of the cylindrical primary assembly, and there are two long beams, which are symmetrically mounted on the upper and lower ends of the two primary mounting assemblies; the side of the long beam close to the primary assembly A vertical hollow structure is arranged on the end face, a horizontal hollow structure is arranged in the middle of the long beam, and the horizontal hollow structure and the vertical hollow structure are interconnected; the hanging parts are embedded in both sides of the long beam, the hanging parts are hollow tubular structures, and the left and right side surfaces thereof are partially hollowed out, grooves for placing the friction pair sliding plates are also arranged on the left and right side surfaces of the hanging parts, the connecting parts are fixedly arranged on the upper and lower surfaces of the secondary components, the connecting parts include a fixed block located in the middle and a horizontal rod arranged on the upper or lower part of the fixed block, the fixed block passes through the vertical hollow structure of the long beam, and the horizontal rod passes through the horizontal hollow structure of the long beam and is fixedly connected with the friction pair sliding plates.

[0008] Furthermore, the cylindrical primary component includes a primary core with grooves, an annular winding and casting material; the installation position of the primary core is determined by the position of the middle beam; the annular primary winding is wound on the outer surface of the primary cylindrical core and is formed by integral vacuum pressure casting. After casting, the coil and the glue layer are an integral structure, and the casting material fills the gaps between single windings and between the windings and the core, so that the windings and the core, and the windings and the ends of the mover bracket are solidified as a whole.

[0009] Furthermore, the annular winding includes Litz wire, an outlet / parallel joint, and insulation; the coil winding is wound by the Litz wire along the outer circle of the stator core, and the folded part of the winding is placed in a groove pre-opened in the primary core; each coil is folded at the same angle at the same position, which is convenient for embedding in the groove of the primary core to achieve winding fixation and transposition.

[0010] Furthermore, the primary iron core is formed by bonding and stacking circular silicon steel sheets. After the circular silicon steel sheets are stacked, the inside and outside are concentric circle structures. In order to ensure the concentricity of the inner and outer circles and the dimensional accuracy, the iron core is installed and fixed to the primary mounting assembly, and is positioned by positioning pins. In addition, an axial groove is opened on the surface of the iron core for installing and fixing the primary annular winding.

[0011] Furthermore, each pole of the annular winding is transposed by the wire in the groove between the primary iron core and the magnetic pole, and the two ends of the winding are led out through the winding lead-out holes reserved at the two ends of the mover bracket.

[0012] Furthermore, the casting material is epoxy resin material.

[0013] Furthermore, the primary mounting assembly includes an intermediate beam and a flange; a circular mounting straight hole for positioning the primary iron core is provided in the middle of the intermediate beam; the intermediate beam is located on the left and right sides of the entire frame, and the flanges are respectively installed in the mounting straight holes of the left and right intermediate beams, and the cylindrical primary assembly is fixedly mounted on the flange during assembly.

[0014] Furthermore, the friction pair sliding plate is a wear-resistant and smooth non-metallic material, such as Teflon; it provides a support point for the secondary component, maintains a set gap between the cylindrical primary component and the secondary component, prevents direct friction between the two, and provides guidance for the secondary movement.

[0015] Furthermore, the secondary component includes a cylindrical secondary core shell, a permanent magnet, a core sleeve and an end ring; the cylindrical secondary core shell is made of concentric circular silicon steel sheets, and a permanent magnet is arranged on the inner side of the cylindrical secondary core shell. The permanent magnet is a permanent magnet ring spliced ​​by single-piece magnetic tiles with the same magnetizing direction, and magnetic tiles with different magnetizing directions are installed alternately. It is installed on the outer surface of the core sleeve, that is, the permanent magnet is arranged in the interlayer between the core sleeve and the cylindrical secondary core shell, which is used to provide a constant air gap magnetic field to the motor. The core sleeve is a steel thin-walled cylinder, which is used to install and fix the permanent magnet and provide a path for the magnetic lines of force. It is installed on the inner surface of the secondary core shell, and the end rings are installed at both ends of the core sleeve to tightly connect the core sleeve and the secondary core shell, so that the permanent magnet, the core sleeve, the secondary core shell and the secondary connecting piece are tightly connected into a whole to constitute the secondary of the cylindrical motor.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention adopts an extremely high power density cylindrical linear motor, and the primary winding adopts a ring structure, so there is no end winding, and there is no lateral end leakage flux and additional impedance, and the winding utilization rate is high; the linear motor achieves high thrust density, high redundancy, good controllability and self-compatibility, etc.

[0018] 2. The present invention adopts an extremely high power density cylindrical linear motor, and the secondary is a cylindrical iron core with an embedded permanent magnet structure, which does not require the use of wires for power supply, making it easy to install and easy to connect with the execution structure;

[0019] 3. The present invention adopts an extreme high power density cylindrical linear motor, the entire motor structure is compact, the motor volume and weight are small, and the motor has a high thrust density. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of a cylindrical linear motor in a preferred embodiment of the present invention;

[0021] Figure 2 It is a schematic diagram of the overall structure of a cylindrical linear motor frame in a preferred embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the structure of the intermediate beam of the cylindrical linear motor frame of a preferred embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the secondary support structure of a cylindrical linear motor in a preferred embodiment of the present invention;

[0024] Figure 5 Schematic diagram of the structure of the cylindrical linear motor frame long beam at two different angles of a preferred embodiment of the present invention;

[0025] Figure 6 It is a schematic structural diagram of the matching between the cylindrical linear motor frame hanging member and the friction pair sliding plate of a preferred embodiment of the present invention;

[0026] Figure 7 It is a schematic diagram of the secondary structure of a cylindrical linear motor in a preferred embodiment of the present invention;

[0027] Figure 8 It is a schematic diagram of the overall structure of the primary annular winding of a cylindrical linear motor in a preferred embodiment of the present invention;

[0028] Fig. 9 It is a schematic structural diagram of the folded portion of the primary winding of a cylindrical linear motor in a preferred embodiment of the present invention;

[0029] The reference numerals in the figure respectively represent: 1-hanging part, 2-cylindrical primary component, 3-middle beam, 31-mounting straight hole, 4-flange, 5-long beam, 51-vertical hollow structure, 52-horizontal hollow structure, 6-secondary component, 7-connecting part, 71-fixing block, 72-horizontal rod, 8-cylindrical secondary core shell, 9-groove, 10-permanent magnet, 11-core sleeve, 12-end ring, 13-folding position, 14-friction pair sliding plate. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0031] Figure 1 Schematic diagram of the overall structure of the cylindrical linear motor of the present invention. Figure 1As shown, an extreme high power density cylindrical linear motor device designed by the present invention includes a hanging part 1, a cylindrical primary component 2 (the primary includes a primary core and an embedded winding on the primary core slot), an intermediate beam 3, a flange 4, a long beam 5 and a secondary 6 (the secondary is a cylindrical core inlaid with a permanent magnet, a connecting part 7 and a cylindrical secondary core shell 8); the hanging part 1 is installed and fixed in the groove of the long beam, and the groove position 9 on it is used to install the friction pair sliding plate. The primary 2 is a solid electromagnetic stator, and its installation and fixing position is determined by the intermediate beam 3. The intermediate beam 3 is used to connect the upper and lower long beams 5. The flange 4 is installed in the straight hole of the intermediate beam. The secondary 6 mainly includes a permanent magnet, a connecting part 7 and a secondary core shell 8, wherein the secondary core shell 8 is cylindrical, and its inner surface is inlaid with a permanent magnet. The connecting part 7 is used to fix and support the primary core, and cooperate with the friction pair sliding plate to provide guidance for the reciprocating motion of the secondary.

[0032] Figure 2 The present invention is a schematic diagram of the overall structure of the cylindrical linear motor frame. The overall structure of the frame is mainly composed of two middle beams 3, two flanges 4 and two long beams 5. The frame is welded and formed by titanium alloy. The frame is cylindrical and light in weight. The middle beams on the left and right sides play a supporting and connecting role. The upper and lower long beams are connected and fixed, and the frame is connected as a whole, which plays a role in supporting and fixing the motor. The middle beams located on the left and right sides of the frame are formed by titanium alloy with light weight and high hardness. The center is processed with a straight hole according to the size of the secondary iron core, and the center is a cavity. The middle beams on the left and right sides can fix the primary stator iron core in a certain spatial position. At the same time, with the application of the flange, the secondary iron core is fixed between the middle beams on the left and right sides; the long beam is located on the upper and lower sides of the middle beam. The long beam is in the shape of an "I" as a whole. The bottom of the long beam is connected to the two middle beams, and the grooves on both sides are used to place and install the hanging parts. At the same time, the long beam structure is hollow to ensure that the secondary connecting parts can pass through its bottom and extend on both sides of the long beam. The length of the hollow should not be less than the length of the secondary movement. The hanging part 1 is the installation and fixing position of the secondary mover of the motor, and also provides a connection for the propulsion target. The primary 2 is an electromagnetic stator, which is fixed at the center of the frame. The middle beam 3 is located on both sides of the frame and is the installation and fixing position of the primary iron core. The flange 4 is the fixed connection position between the primary iron core and the frame. The long beam 5 is an "I" shape, one on the upper and lower sides of the frame, which is used to fix the hanging part 1 and connected to the middle beam 3. The secondary 6 is a mover, which is arranged on the outer surface of the primary 2 iron core to achieve reciprocating movement along the outer surface of the primary 2 iron core. The hanging part 1 is connected to the secondary 6 through a friction pair and a connecting part, providing a straight track for the secondary to provide a guiding effect for the secondary movement, and at the same time play a supporting and fixing role, wherein the connecting part is located at the position 7 of the secondary iron core, and the friction pair is installed in the groove 9 of the hanging part 1;

[0033] Figure 3Schematic diagram of the structure of the intermediate beam of the cylindrical linear motor frame of the present invention, which is installed between the two long beams. Figure 2 or Figure 1 As shown, the middle beam needs to cooperate with the flange plate, which mainly plays the role of installing and fixing the primary core; two straight holes need to be opened in the geometric center of the middle beam, one of which is determined by the size of the primary core and is used to install and place the primary core therein, and the other one needs to be larger than the size of the primary core and is used to place the primary core while ensuring that the flange plate can be placed therein. The flange plate can fix the primary core and the middle beam, thereby ensuring the relative fixity of the primary position in the motor.

[0034] Figure 4 Schematic diagram of the secondary support structure of the cylindrical linear motor of the present invention, which is cylindrical in shape as a whole, installed on the outer surface of the primary core and concentric with the primary core, and its installation position diagram is as shown in FIG. Figure 2 or Figure 1 The secondary structure mainly includes a permanent magnet, a connector 7 and a cylindrical secondary core shell 8, wherein the connector 7 has a total of 4 transverse columns, which are used to extend the hanging part 1 to connect with the friction pair sliding plate and the propulsion target carrier, and are used to propel the target carrier to move; wherein, the cylindrical secondary core shell 8 is made of concentric circular silicon steel sheets, and the cylindrical secondary is embedded with a permanent magnet. When the primary annular winding is energized, a traveling wave magnetic field is generated in the electromagnetic air gap. At this time, the electromagnetic thrust is generated by the magnetic field generated by the secondary embedded permanent magnet, so that the secondary as a whole together with the connector 7 moves linearly along the surface of the primary core, and the electromagnetic thrust is converted into kinetic energy of the propulsion target carrier through the connecting rod 7 to do work on the propulsion target carrier, thereby realizing the linear motion of the propulsion target carrier.

[0035] Figure 5 Schematic diagram of the cylindrical linear motor frame long beam structure of the present invention, which is installed on the upper and lower sides of the middle beam, wherein the middle beam structure is as follows Figure 3 As shown, the installation location is as follows Figure 2 or Figure 1 As shown, the two long beams are in an "I" shape as a whole, and cooperate with the middle beam to form the entire motor frame structure, such as Figure 2 As shown, the bottom of the "I" shape and the interior of the geometric body are hollow, the main purpose is to cooperate with the use of the secondary iron core connector 7. This structure can ensure that the connector 7 can smoothly enter the bottom of the long beam and pass through the left and right sides of the "I" shape, thereby ensuring secondary transmission; and the grooves on the left and right sides of the "I" shape are used to install the hanging parts, and the grooves on the left and right sides prevent the hanging parts from moving during the operation of the motor, wherein the hanging part structure is as shown in Figure 5 .

[0036] Figure 6 Schematic diagram of the cylindrical linear motor frame mounting structure of the present invention, which is installed in the grooves on the left and right sides of the long beam, and the schematic diagram of its installation position is as shown in FIG. Figure 2 or Figure 1 The outer side of the said hanging part 1 is provided with a groove 9 for installing a friction pair slide 14, which can move along the groove in the hanging part. The friction pair slide needs to be connected with the secondary connecting part 7 and the propulsion target carrier to realize the installation and fixation of the secondary and provide a motion guide for it, and at the same time drive the propulsion target carrier to move along the groove to realize the linear motion of the propulsion target carrier. The hanging part adopts a hollow structure as a whole, and the back is grooved to ensure that the secondary connecting part can pass through the hanging part smoothly and can move normally. This structure reduces the overall weight of the motor and also provides a guide for the movement of the secondary and the propulsion target carrier.

[0037] Figure 7 1 is a schematic diagram of the secondary structure of the cylindrical linear motor of the present invention. The permanent magnet 10 is a permanent magnet ring formed by splicing single-piece magnetic tiles with the same magnetizing direction. The permanent magnet rings with different magnetizing directions are installed alternately. The permanent magnet ring is installed on the outer surface of the core sleeve 11 to provide a constant air gap magnetic field for the motor. The core sleeve 11 is a steel thin-walled cylinder for installing and fixing the permanent magnet and providing a path for the magnetic lines of force. The core sleeve 11 is installed on the inner surface of the secondary core shell 8. The end ring 12 is installed at the position shown in FIG. Figure 7 As shown, it is installed at both ends of the core sleeve and is used to tightly connect the core sleeve 11 and the secondary core shell 8, so that the permanent magnet 10, the core sleeve 11, the secondary core shell 8 and the secondary connecting piece 7 are tightly connected into a whole, forming the secondary of the cylindrical motor of the present invention.

[0038] Figure 8 The primary annular winding of the cylindrical linear motor of the present invention is a schematic diagram of the overall structure. The annular winding includes Litz wire, outlet / parallel connector, and insulation. The coil winding is wound by Litz wire along the outer circle of the stator core. Each coil is folded at a certain angle at the same position to facilitate embedding in the groove of the primary core to achieve winding fixation and transposition. The folding position 13 is as shown in FIG. Figure 8 As shown in the figure, the part is folded and enlarged as shown in Fig. 9 As shown, the primary annular winding is used to pass alternating current to generate a magnetic field, which interacts with the magnetic field generated by the permanent magnet to drive the secondary as a whole to move back and forth along the surface of the iron core.

[0039] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the structural relationship and principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. An extremely high power density cylindrical linear motor, characterized in that : It comprises a frame, a hanging part (1), a cylindrical primary component (2), a secondary component (6), a connecting part (7) and a friction pair sliding plate (14); the frame comprises a primary mounting component, a long strip-shaped beam (5) and a hanging part (1); there are two primary mounting components, which are respectively sleeved on the two ends of the cylindrical primary component (2) to fix the cylindrical primary component (2); the secondary component (6) is sleeved in the middle of the cylindrical primary component (2); there are two long beams (5), which are symmetrically mounted on the upper and lower ends of the two primary mounting components; the end surface of the long beam (5) close to the primary component is provided with a vertical hollow structure (51), and the middle of the long beam (5) is provided with a horizontal hollow structure (52). The structure (52) has a horizontal hollow structure and a vertical hollow structure that are interconnected; the hanging member (1) is embedded in both sides of the long beam (5); the hanging member (1) is a hollow tubular structure and its left and right side surfaces are partially hollowed out; the left and right side surfaces of the hanging member (1) are also provided with grooves (9) for accommodating the friction pair sliding plate (14); the connecting member (7) is fixedly arranged on the upper surface and the lower surface of the secondary component (6); the connecting member (7) comprises a fixed block (71) located in the middle and a horizontal rod (72) arranged on the upper part or the lower part of the fixed block; the fixed block (71) passes through the vertical hollow structure of the long beam (5); the horizontal rod (72) passes through the horizontal hollow structure of the long beam (5) and is fixedly connected to the friction pair sliding plate (14); The cylindrical primary component (2) comprises a primary core with a groove, an annular winding and a casting material; the installation position of the primary core is determined by the position of the middle beam; the annular primary winding is wound on the outer surface of the primary cylindrical core and is formed by integral vacuum pressure casting; after casting, the coil and the glue layer are an integral structure; the casting material fills the gaps between the individual windings and between the winding and the core, so that the winding and the core, and the winding and the end of the mover bracket are solidified into a whole; The primary mounting assembly comprises an intermediate beam (3) and a flange (4); a circular mounting straight hole (31) for positioning the primary iron core is provided in the middle of the intermediate beam (3); the intermediate beam (3) is located on the left and right sides of the entire frame, the flanges (4) are respectively mounted in the mounting straight holes of the left and right intermediate beams, and the cylindrical primary assembly (2) is fixedly mounted on the flange (4) during assembly; The secondary component (6) comprises a cylindrical secondary core shell (8), a permanent magnet (10), a core sleeve (11) and an end ring (12).

2. The extreme high power density cylindrical linear motor according to claim 1, characterized in that: The annular winding includes Litz wire, an outlet / parallel joint, and insulation; the coil winding is wound by the Litz wire along the outer circle of the stator core, and the folded part of the winding is placed in a groove pre-opened in the primary core; each coil is folded at the same angle at the same position, which is convenient for embedding in the groove of the primary core to achieve winding fixation and transposition.

3. The extreme high power density cylindrical linear motor according to claim 1, characterized in that: The primary iron core is formed by bonding and stacking circular silicon steel sheets. After the circular silicon steel sheets are stacked, the inside and outside are concentric circle structures. In order to ensure the concentricity of the inner and outer circles and the dimensional accuracy, the iron core is installed and fixed to the primary installation assembly, and is positioned by positioning pins. In addition, an axial groove is opened on the surface of the iron core for installing and fixing the primary annular winding.

4. The extreme high power density cylindrical linear motor according to claim 2, characterized in that: The annular winding is transposed between each pole through the groove between the primary iron core and the magnetic pole, and the two ends of the winding are led out through the winding lead-out holes reserved at the two ends of the mover bracket.

5. The extreme high power density cylindrical linear motor according to claim 1, characterized in that: The casting material is epoxy resin material.

6. The extreme high power density cylindrical linear motor according to claim 1, characterized in that: The friction pair sliding plate (14) is made of a wear-resistant and smooth non-metallic material, and provides a support point for the secondary component (6).

7. The extreme high power density cylindrical linear motor according to claim 1, characterized in that: The cylindrical secondary core shell (8) is made of concentric circular silicon steel sheets. A permanent magnet (10) is arranged on the inner side of the cylindrical secondary core shell (8). The permanent magnet (10) is a permanent magnet ring formed by splicing single-piece magnetic tiles with the same magnetizing direction. Magnetic tiles with different magnetizing directions are installed alternately. The permanent magnet (10) is installed on the outer surface of the core sleeve (11) to provide a constant air gap magnetic field for the motor. The core sleeve (11) is a steel thin-walled cylinder for installing and fixing the permanent magnet and providing a path for magnetic lines of force. The permanent magnet (10) is installed on the inner surface of the secondary core shell (8). End rings (12) are installed at both ends of the core sleeve to tightly connect the core sleeve (11) and the secondary core shell (8), so that the permanent magnet (10), the core sleeve (11), the secondary core shell (8) and the secondary connecting member (7) are tightly connected into a whole to form a cylindrical motor secondary.

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