Permanent magnet linear synchronous motor

Abstract

The invention provides a permanent magnet linear synchronous motor which comprises two opposite supporting frames, accommodating grooves are formed in the opposite positions of the supporting frames, guide plates are fixed to the opposite sides of the supporting frames, sliding rings are arranged between the supporting frames, and the sliding rings are connected to the exteriors of the guide plates in a sleeving mode and can slide along the guide plates. First permanent magnets are arranged between the guide plate and the supporting frame, a coil winding is arranged on the outer ring face of the sliding ring in a surrounding mode, and when the coil winding is powered on, the sliding ring moves back and forth along the guide plate under the action of magnetic field force between the first permanent magnets. According to the invention, the sliding ring is arranged between the first permanent magnets, and the coil winding is arranged around the outer ring surface of the sliding ring, so that the sliding ring can linearly move back and forth between the first permanent magnets after the coil winding is electrified, and a load can be driven to accurately move on a plane in the field of laser galvanometers. In addition, a limited rotation angle motor is matched, and three-dimensional accurate positioning in the X-axis direction, the Y-axis direction and the Z-axis direction can be achieved.

Description

Technical Field

[0001] This invention relates to the field of electric motors, and more specifically to a permanent magnet linear synchronous motor. Background Technology

[0002] If a linear synchronous motor cannot achieve precise positioning, it will directly lead to a serious decline in system performance. First, in industrial scenarios requiring high-precision synchronous control (laser galvanometer motors), positioning deviations will reduce product quality, causing processing errors or even product scrap. Second, limited dynamic response capabilities make it difficult for the motor to quickly stabilize at the target position, increasing adjustment time and reducing production efficiency. In addition, inaccurate positioning will cause mechanical vibration or impact, accelerating equipment wear and shortening its service life. Finally, to achieve the required precision, complex and expensive feedback compensation systems are often required, significantly increasing control difficulty and overall cost, thereby weakening its competitiveness in high-end applications. Summary of the Invention

[0003] To address the aforementioned problems, this application provides a permanent magnet linear synchronous motor, comprising two opposing U-shaped support frames. An open receiving groove is provided at the relative position of the support frames. A guide plate is fixed to the opposite side of the support frames. A sliding ring is provided between the support frames, the sliding ring being sleeved on the outside of the guide plate and capable of sliding along the guide plate. A first permanent magnet is provided between the guide plate and the support frames, with the same poles of the first permanent magnets facing each other. A coil winding is arranged around the outer ring surface of the sliding ring. When the coil winding is energized, the sliding ring reciprocates along the guide plate under the action of the magnetic field force between the first permanent magnets.

[0004] Furthermore, the sliding ring is rectangular in shape and includes a top plate, a bottom plate, and a side plate for connecting the top plate and the bottom plate. The top plate and the bottom plate are disposed between the first permanent magnet along the vertical direction, and the side plate is disposed between the guide plate and the first permanent magnet and is parallel to the first permanent magnet.

[0005] Furthermore, the support frame includes a support portion, and extension portions perpendicular to the support portion are provided on both sides of the support portion. The first permanent magnet is rectangular in shape, and one side of the first permanent magnet is tightly attached to the support portion. A magnetic shielding sheet is provided between the extension portions and the two sides of the first permanent magnet.

[0006] Furthermore, the magnetic shielding sheet has the same length as the extension portion and is perpendicular to the guide plate.

[0007] Furthermore, a support base is provided between the support frames, and a guide rail is provided on the top of the support base. The layout direction of the guide rail is parallel to that of the guide plate. A sliding seat is fixed at the bottom of the top plate. The sliding seat is engaged with the top of the guide rail and can slide along the guide rail.

[0008] Furthermore, a first limiting rod is provided on one side opposite to the guide plate, and first positioning holes are provided on both sides of the support base. When the support base is located between the support frames, the first limiting rod is inserted into the first positioning hole.

[0009] Furthermore, a base is provided at the bottom of the support frame, a connecting plate is provided on the base plate, a second permanent magnet is provided at the bottom of the connecting plate, and a Hall sensor is provided on the base, with the Hall sensor located below the second permanent magnet.

[0010] Furthermore, a second positioning hole is provided at one end of the extension portion, and a second limiting rod protruding outward is provided on the side of the guide plate away from the support seat. When the guide plate is assembled with the support frame, the second limiting rod is inserted into the second positioning hole.

[0011] Furthermore, a third permanent magnet is provided above the top plate, and the arrangement direction of the third permanent magnet is perpendicular to the arrangement direction of the first permanent magnet.

[0012] Furthermore, the third permanent magnet has a protrusion on the side facing the top plate.

[0013] Compared with the prior art, the beneficial effects of the present invention are: Compared with the prior art: This application sets a sliding ring between first permanent magnets, and a coil winding is arranged around the outer ring surface of the sliding ring. This allows the sliding ring to make linear reciprocating motion between the first permanent magnets when the coil winding is energized. In the field of laser galvanometers, this can drive the load to move precisely on a plane. When combined with a limited rotation angle motor, it can also achieve three-dimensional precise positioning in three directions of XYZ axes.

[0014] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the magnetic field lines of the present invention; Figure 3 This is a cross-sectional view of the overall structure of the present invention; Figure 4 This is a schematic diagram of the overall structure of the present invention from another angle; Figure 5 This is an exploded view of the present invention; Figure 6 This is a schematic diagram of the structure of the second permanent magnet of the present invention; Figure 7 This is a schematic diagram of the structure of the second embodiment of the present invention; Figure 8 This is a schematic diagram of the structure of the third permanent magnet of the present invention.

[0017] The reference numerals and names in the figure are as follows: Support frame 100, receiving groove 110, guide plate 200, sliding ring 300, first permanent magnet 400, coil winding 310, top plate 320, bottom plate 330, side plate 340, support part 120, extension part 130, magnetic shielding sheet 140, support base 500, guide rail 510, sliding base 520, first limiting rod 210, first positioning hole 530, base 600, connecting plate 331, second permanent magnet 332, Hall sensor 610, second positioning hole 131, second limiting rod 220, third permanent magnet 700, protrusion part 710, bracket 800. Detailed implementation method: The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] The present invention will now be described in more detail. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention. It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as being "connected to" another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them.

[0019] In the description of this invention, it should be noted that directional terms such as "front," "rear," "up," "down," "left," "right," "horizontal," "vertical," "horizontal," and "top," "bottom," etc., indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are used solely for the convenience of describing the invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner or outer contours of each component itself. In the description of this invention, it should be noted that the use of terms such as "first" and "second" to define components is merely for the convenience of distinguishing the corresponding components. Unless otherwise stated, these terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0020] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention.

[0021] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0022] The preferred embodiments of the present invention will now be further described with reference to the accompanying drawings, such as... Figure 1As shown, a permanent magnet linear synchronous motor includes two opposing U-shaped support frames 100. An open receiving groove 110 is provided at the opposite position of each support frame 100. A guide plate 200 is fixed to the opposite side of each support frame 100. A sliding ring 300 is provided between the support frames 100. The sliding ring 300 is sleeved on the outside of the guide plate 200 and can slide along the guide plate 200. A first permanent magnet 400 is provided between the guide plate 200 and the support frame 100, with the same poles of the first permanent magnets 400 facing each other. A coil winding 310 is arranged around the outer ring surface of the sliding ring 300. When the coil winding 310 is energized, the sliding ring 300 moves back and forth along the guide plate 200 under the action of the magnetic force between the first permanent magnets 400.

[0023] This application pertains to a type of linear motor, primarily used in applications such as electric toothbrushes or galvanometer motors. In the operating state of this application, as follows... Figure 2 As shown, the support frame 100 is disposed opposite to both sides of the guide ring, and the guide plate 200 is respectively engaged with both sides of the inner ring of the guide ring. Its function is to allow the sliding ring 300 to be suspended between the support frames 100 and to guide the movement of the sliding ring 300. The first permanent magnet 400 is disposed in the receiving groove 110 between the guide plate 200 and the support frame 100, and the first permanent magnets 400 are arranged with the same poles facing each other. Here, the same poles facing each other refers to the same polarity of the first permanent magnets 400 being arranged opposite each other, such as N pole facing N pole or S pole facing S pole. A coil winding 310 is disposed around the outer ring surface of the sliding ring 300. When the coil winding 310 is energized, a magnetic field is generated around the coil winding 310 based on the magnetic effect of the current, thereby exerting a magnetic force between the first permanent magnets 400. Figure 2 (Middle dashed line) The sliding ring 300 moves along the guide plate 200. When the energizing direction of the coil winding 310 is changed, the direction of the magnetic field generated around the coil winding 310 changes. As a result, under the action of the magnetic force between the first permanent magnets 400, the sliding ring 300 is driven to move in the opposite direction along the guide plate 200, thus forming a reciprocating movement. Figure 2 (The direction of the middle F arrow).

[0024] Compared with the prior art, this application sets the sliding ring 300 between the first permanent magnets 400, and a coil winding 310 is arranged around the outer ring surface of the sliding ring 300. This allows the sliding ring 300 to make linear reciprocating motion between the first permanent magnets 400 after the coil winding 310 is energized. In the field of laser galvanometers, this can drive the load to move precisely on a plane. With the help of a limited rotation angle motor, it can also achieve three-dimensional precise positioning in three directions of XYZ axes.

[0025] Furthermore, based on the above embodiments, combined with Figure 1 and Figure 3 As shown, the sliding ring 300 is rectangular in shape and includes a top plate 320, a bottom plate 330, and a side plate 340 for connecting the top plate 320 and the bottom plate 330. The top plate 320 and the bottom plate 330 are arranged between the first permanent magnet 400 along the vertical direction of the first permanent magnet 400. The side plate 340 is arranged between the guide plate 200 and the first permanent magnet 400 and is parallel to the first permanent magnet 400. This allows the coil winding 310 to effectively improve its power density, efficiency, and performance within the limited physical space between the first permanent magnets 400 by increasing material utilization, providing good heat dissipation, and controlling high-frequency losses.

[0026] Furthermore, based on the above embodiments, combined with Figure 2 and Figure 4 As shown, the support frame 100 includes a support portion 120, with extension portions 130 perpendicular to the support portion 120 on both sides. The first permanent magnet 400 is rectangular in shape, with one side of the first permanent magnet 400 tightly attached to the support portion 120. A magnetic shielding sheet 140 is provided between the extension portion 130 and the two sides of the first permanent magnet 400. The magnetic shielding sheet 140 optimizes the magnetic lines of force emanating from the first permanent magnet 400, preventing them from entering the first permanent magnet 400 through the extension portion 130. This allows the magnetic lines of force to originate from the first permanent magnet 400, pass through the magnetic field generated by the coil winding 310, and then concentrate before entering the first permanent magnet 400 from the support portion 120. This allows more magnetic lines of force to pass through the magnetic field generated by the coil winding 310, preventing magnetic leakage.

[0027] Furthermore, based on the above embodiments, such as Figure 4 As shown, the magnetic shielding sheet 140 has the same length as the extension portion 130 and is perpendicular to the guide plate 200. Setting the length of the magnetic shielding sheet 140 to be the same as that of the extension portion 130 allows the magnetic shielding sheet 140 to achieve the best isolation effect between the extension portion 130 and the first permanent magnet 400 without affecting the normal magnetic field line distribution.

[0028] Furthermore, based on the above embodiments, such as Figure 5As shown, a support base 500 is provided between the support frames 100, and a guide rail 510 is provided on the top of the support base 500. The arrangement direction of the guide rail 510 is parallel to that of the guide plate 200. A sliding seat 520 is fixed at the bottom of the top plate 320. The sliding seat 520 is engaged with the top of the guide rail 510 and can slide along the guide rail 510. In this way, when the sliding ring 300 moves back and forth along the guide plate 200 under the action of the magnetic force between the first permanent magnets 400, it drives the sliding seat 520 to move along the guide rail 510, thereby helping to guide the movement of the sliding ring 300.

[0029] Furthermore, based on the above embodiments, such as Figure 5 As shown, a first limiting rod 210 is provided on one side opposite to the guide plate 200, and first positioning holes 530 are provided on both sides of the support base 500. When the support base 500 is located between the support frames 100, the first limiting rod 210 is inserted into the first positioning hole 530. This allows the support base 500 to be suspended and fixed below the support frame 100.

[0030] Furthermore, based on the above embodiments, such as Figure 6 As shown, a base 600 is provided at the bottom of the support frame 100, a connecting plate 331 is provided on the base plate 330, a second permanent magnet 332 is provided at the bottom of the connecting plate 331, and a Hall sensor 610 is provided on the base 600, located below the second permanent magnet 332. Under the action of the magnetic force between the first permanent magnets 400, the sliding ring 300 moves back and forth along the guide plate 200, causing the second permanent magnet 332 to continue moving above the Hall sensor 610. This allows the Hall sensor 610 to collect the movement data of the sliding ring 300, including but not limited to its trajectory and speed. This data is then transmitted, analyzed, and fed back to change the current intensity and direction on the coil winding 310, thereby driving the sliding ring 300 to move precisely on the plane.

[0031] Furthermore, based on the above embodiments, such as Figure 5 As shown, a second positioning hole 131 is provided at one end of the extension portion 130, and a second limiting rod 220 protruding outward is provided on the side of the guide plate 200 away from the support base 500. When the guide plate 200 is assembled with the support frame 100, the second limiting rod 220 is inserted into the second positioning hole 131. This forms a fixed connection between the guide plate 200 and the support frame 100, preventing the guide plate 200 from moving along with the sliding ring 300 when the sliding ring 300 moves.

[0032] This application also provides a second embodiment, which differs from the first embodiment in that, as follows: Figure 7 As shown, a bracket 800 is installed directly above the top plate 320, and a third permanent magnet 700 is fixed at the bottom of the bracket 800. The arrangement direction of the third permanent magnet 700 is perpendicular to the arrangement direction of the first permanent magnet 400. Thus, when the sliding ring 300 moves back and forth along the guide plate 200 under the action of the magnetic force between the first permanent magnets 400, the magnetic field generated by the third permanent magnet 700 can compensate for the imbalance of torque between the coil winding and the magnetic field generated by the first permanent magnet 400. This makes the speed of the sliding ring 300 more linear when it moves along the guide plate 200, preventing sudden acceleration or deceleration that could lead to inaccurate control.

[0033] Furthermore, based on the above embodiments, such as Figure 8 As shown, the third permanent magnet 700 has a protrusion 710 on the side facing the top plate 320. This makes the central magnetic field of the third permanent magnet 700 stronger, thus making its effect on compensating for linear torque imbalance more obvious.

[0034] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A permanent magnet linear synchronous motor, characterized in that, The device includes two opposing U-shaped support frames (100), with open receiving grooves (110) provided at their relative positions. A guide plate (200) is fixed on the opposite side of the support frame (100). A sliding ring (300) is provided between the support frames (100). The sliding ring (300) is sleeved on the outside of the guide plate (200) and can slide along the guide plate (200). A first permanent magnet (400) is provided between the guide plate (200) and the support frame (100). The first permanent magnets (400) with the same poles are arranged opposite each other. A coil winding (310) is arranged around the outer ring surface of the sliding ring (300). When the coil winding (310) is energized, the sliding ring (300) moves back and forth along the guide plate (200) under the action of the magnetic force between the first permanent magnets (400).

2. The permanent magnet linear synchronous motor according to claim 1, characterized in that, The sliding ring (300) is rectangular in shape and includes a top plate (320), a bottom plate (330), and a side plate (340) for connecting the top plate (320) and the bottom plate (330). The top plate (320) and the bottom plate (330) are arranged vertically between the first permanent magnet (400), and the side plate (340) is arranged between the guide plate (200) and the first permanent magnet (400) and is parallel to the first permanent magnet (400).

3. The permanent magnet linear synchronous motor according to claim 2, characterized in that, The support frame (100) includes a support portion (120), and extension portions (130) perpendicular to the support portion (120) are provided on both sides of the support portion (120). The first permanent magnet (400) is rectangular in shape, and one side of the first permanent magnet (400) is closely attached to the support portion (120). A magnetic shielding sheet (140) is provided between the extension portion (130) and the two sides of the first permanent magnet (400).

4. The permanent magnet linear synchronous motor according to claim 3, characterized in that, The magnetic shielding sheet (140) has the same length as the extension portion (130) and is perpendicular to the guide plate (200).

5. The permanent magnet linear synchronous motor according to claim 2, characterized in that, A support base (500) is provided between the support frames (100), and a guide rail (510) is provided on the top of the support base (500). The arrangement direction of the guide rail (510) is parallel to that of the guide plate (200). A sliding seat (520) is fixed at the bottom of the top plate (320). The sliding seat (520) is engaged with the top of the guide rail (510) and can slide along the guide rail (510).

6. The permanent magnet linear synchronous motor according to claim 5, characterized in that, A first limiting rod (210) is provided on one side opposite to the guide plate (200), and a first positioning hole (530) is provided on both sides of the support base (500). When the support base (500) is located between the support frame (100), the first limiting rod (210) is inserted into the first positioning hole (530).

7. The permanent magnet linear synchronous motor according to claim 2, characterized in that, A base (600) is provided at the bottom of the support frame (100), a connecting plate (331) is provided on the base plate (330), a second permanent magnet (332) is provided at the bottom of the connecting plate (331), and a Hall sensor (610) is provided on the base (600), the Hall sensor (610) being located below the second permanent magnet (332).

8. The permanent magnet linear synchronous motor according to claim 3, characterized in that, A second positioning hole (131) is provided at one end of the extension (130), and a second limiting rod (220) protruding outward is provided on the side of the guide plate (200) away from the support base (500). When the guide plate (200) is assembled with the support frame (100), the second positioning hole (131) is inserted into the second limiting rod (220).

9. The permanent magnet linear synchronous motor according to claim 2, characterized in that, A bracket (800) is provided above the top plate (320), and a third permanent magnet (700) is fixed at the bottom of the bracket (800). The arrangement direction of the third permanent magnet (700) is perpendicular to the arrangement direction of the first permanent magnet (400).

10. The permanent magnet linear synchronous motor according to claim 9, characterized in that, The third permanent magnet (700) has a protrusion (710) on the side facing the top plate (320).

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