Electromagnetic decoupling method of linear motor

Abstract

The invention discloses an electromagnetic decoupling method for a linear motor, and the method comprises the following steps: S1, arranging a plurality of sub-motors, and enabling each sub-motor to comprise a magnetic track and a rotor iron core located at the side part of the magnetic track; s2, one or more parallel rails located at the same height are stipulated, and each rail comprises a plurality of sub-motors linearly arranged in the rail; and S3, determining to-be-moved equipment, and according to the shape quality distribution condition of the to-be-moved equipment, enabling the corresponding position of the mobile equipment to be in transmission connection with the rotor iron core of the corresponding sub-motor of the corresponding track. The method has the beneficial effects that the linear motor is decomposed into a plurality of sub-motors, the electromagnetic coupling effect in the operation process is dispersed and weakened, meanwhile, the operation parameters of the specific sub-motor can be independently adjusted, and electromagnetic decoupling is carried out on the specific sub-motor.

Description

Technical Field

[0001] This invention belongs to the field of linear motor technology, and more specifically, relates to an electromagnetic decoupling method for linear motors. Background Technology

[0002] Linear motors, as a type of special motor that directly converts electrical energy into linear motion mechanical energy, have been widely used in industrial production, transportation, and automation equipment in recent years. They mainly consist of two parts: a moving core and a magnetic track. When the coil inside the moving core is energized, it drives the connected equipment to move along the magnetic track under the influence of the magnetic field.

[0003] Linear motors suffer from severe electromagnetic coupling during operation, primarily involving coupling between motor thrust and magnetic flux, and between motor thrust and normal force. These couplings complicate motor control, making high-precision control difficult. Furthermore, existing linear motors exhibit at least the following problems during actual operation: a large normal force exists between the mover core and the magnetic track, causing additional pressure on the equipment and potentially leading to deformation; the coils inside the mover core generate significant heat when energized, affecting motor stability; periodic cogging effects occur between the magnetic fields of the mover core and the magnetic track, impacting the mover core's positioning accuracy; and overall power consumption is high, making them less energy-efficient and environmentally friendly.

[0004] Electromagnetic decoupling is the process of reducing electromagnetic coupling during the operation of a linear motor. Currently, electromagnetic decoupling is mostly achieved by directly adjusting relevant parameters of the linear motor during operation, such as the motor magnetic field, motor windings, and motor temperature. This can alleviate the impact of electromagnetic coupling to some extent. However, the above methods directly affect the linear motor as a whole. On the one hand, changes in certain operating parameters may affect the overall operation of the linear motor, and each parameter adjustment requires extensive testing, which is inconvenient. On the other hand, the electromagnetic coupling conditions at different locations of the linear motor often vary significantly, making it difficult to adjust them all simultaneously. Furthermore, it cannot solve many other problems that arise during the operation of the linear motor. Summary of the Invention

[0005] The present invention aims to design an electromagnetic decoupling method for linear motors, with the main purpose of overcoming the shortcomings of existing methods for solving electromagnetic coupling phenomena, while also addressing other problems in the operation of linear motors. This invention proposes an electromagnetic decoupling method for a linear motor, which includes the following steps: Step S1: The linear motor is equipped with multiple sub-motors, each of which includes a magnetic track and a moving iron core located on the side of the magnetic track; Step S2: Define one or more parallel tracks at the same height, each track containing multiple sub-motors arranged linearly within the track; Step S3: Determine the device to be moved. Based on the shape and mass distribution of the device to be moved, connect the corresponding position of the device to the moving core of the corresponding sub-motor on the corresponding track.

[0006] Furthermore, in step S2, when there are multiple tracks, the tracks are divided into one or more groups, the tracks in the same group are arranged in parallel with the same spacing, the number of sub-motors in different tracks is the same, and the sub-motors in the same track are arranged linearly with the same spacing.

[0007] Furthermore, adjacent sub-motors located in the same track have their magnetic tracks in contact with each other, forming a continuous magnetic track within the track.

[0008] Furthermore, within the same set of tracks, the sub-motors that are aligned front to back are connected in parallel, and the sub-motors within the same track are connected in series.

[0009] Optionally, in step S1, the magnetic rail inside the sub-motor is vertically arranged, and the moving iron core is also vertically arranged on the left and right sides of the magnetic rail.

[0010] Optionally, in step S1, the magnetic rail inside the sub-motor is horizontally arranged, and the moving iron core is also horizontally arranged on the upper and lower sides of the magnetic rail.

[0011] Furthermore, in step S2, multiple tracks located at different altitudes are also included, and tracks located at the same altitude form an orbital array at that altitude.

[0012] Furthermore, when the device to be moved is a square plate structure with uniform mass, the moving core of the sub-motor is connected to the device to be moved based on the principle that the square center of the device to be moved overlaps with the center of all track groups.

[0013] The electromagnetic decoupling method for linear motors proposed in this invention directly disperses and weakens the electromagnetic coupling phenomenon generated by the original linear motor by replacing the larger motor with multiple smaller sub-motors. Furthermore, operators can individually adjust the parameters of a specific sub-motor based on its operating status to reduce the electromagnetic coupling generated by that sub-motor, without affecting other sub-motors or excessively interfering with equipment operation. In addition, because it is decomposed into multiple sub-motors, the normal forces generated within each sub-motor cancel each other out, making the equipment less prone to deformation due to normal forces. The dispersed sub-motor structure facilitates heat dissipation, improving stability during operation. The cogging effect generated within the sub-motors is smaller and also partially cancels out between sub-motors, reducing the impact on the positioning accuracy during the movement of the moving core. Individual adjustments to a single sub-motor reduce power consumption, making it more energy-efficient and environmentally friendly. Attached Figure Description

[0014] Figure 1 This is a flowchart of the present invention; Figure 2 This is a three-dimensional structural diagram of the linear motor in this invention.

[0015] The correspondence between the labels and component names in the attached figures is as follows: 1. Sub-motor; 2. Magnetic track; 3. Moving core. Detailed Implementation

[0016] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments.

[0017] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing the invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0018] In addition to indicating location or positional relationship, some of the terms mentioned above may also have other meanings. For example, the term "above" may also be used in some cases to indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this invention according to the specific circumstances.

[0019] like Figure 1 and Figure 2As shown, this invention proposes a specific embodiment, which is an electromagnetic decoupling method for a linear motor. The overall idea is to replace the existing single large linear motor with multiple smaller sub-motors 1, thereby achieving the effect of electromagnetic decoupling. See the flowchart below. Figure 1 Specifically, it includes the following steps: Step S1: Set sub-motor 1 The linear motor comprises multiple independent sub-motors 1, as shown in the reference... Figure 2 As shown, at the same height, multiple sub-motors 1 are arranged sequentially along two vertical squares. Each sub-motor 1 includes a magnetic track 2 and a moving iron core 3 located on the side of the magnetic track 2. The moving iron core 3 of all sub-motors 1 is connected to the power supply and the central control system. Multiple permanent magnets are provided on the two sides of the magnetic track 2 with the largest area. The N poles and S poles of adjacent permanent magnets are arranged alternately. After the moving iron core 3 is energized, it is affected by the magnetic field generated by the permanent magnets on the magnetic track 2 and moves along the magnetic track 2.

[0020] Depending on the specific application scenario, the magnetic track 2 inside the sub-motor 1 can be set vertically or horizontally. When the magnetic track 2 is set vertically, the permanent magnets are set vertically on the left and right sides of the magnetic track 2, and the moving core 3 is also set vertically on the left and right sides of the magnetic track 2. When the magnetic track 2 is set horizontally, the permanent magnets are set horizontally on the top and bottom sides of the magnetic track 2, and the moving core 3 is also set horizontally on the top and bottom sides of the magnetic track 2. Figure 2 Both the magnetic track 2 and the moving iron core 3 are set horizontally.

[0021] Step S2: Set the position of the track and sub-motor 1 One or more parallel tracks at the same height are defined, and multiple sub-motors 1 are set in each track. Typically, the number of sub-motors 1 in each track is the same and they are arranged linearly within the track. Based on the above, when there are multiple tracks, the tracks can be divided into one or more groups, where the tracks in the same group are arranged in parallel with the same spacing, and the sub-motors 1 in the track are arranged linearly with the same spacing. After this, all the sub-motors 1 will be arranged in a matrix. In addition, when the number of track groups is even, the tracks can be arranged symmetrically and mirror each other.

[0022] Furthermore, the distance between adjacent sub-motors 1 located in the same track can be made zero. At this time, the adjacent magnetic rails 2 are in contact with each other, and finally a continuous magnetic rail 2 is formed in the track to increase the distance that the moving iron core 3 can move along the magnetic rail 2. Alternatively, the sub-motors 1 in the same track can be regarded as a whole, and only one integrated magnetic rail 2 can be set. Then, multiple parallel moving iron cores 3 are provided on the side of the magnetic rail 2.

[0023] Furthermore, the tracks can be at different heights. Tracks at the same height can form a track array at that height, while track arrays at different heights are equivalent to linear motors at different heights. This method of setting linear motors at different heights greatly saves space.

[0024] Step S3: Install the device to be moved The device to be moved is determined, and based on its shape and mass distribution, the corresponding position of the device is connected to the moving core 3 of the corresponding sub-motor 1 on the corresponding track. The determination of the corresponding position of the device and the moving core 3 of the corresponding sub-motor 1 can be achieved through finite element analysis or other methods. The device is decomposed into several simpler structures, and then, based on the mass distribution of each part, a suitable sub-motor 1 is selected, and its moving core 3 is connected to the device.

[0025] Typically, linear motors drive a worktable, and the workpiece is placed on the worktable. This type of worktable can be simplified to a square plate structure with uniform mass. At this time, it is only necessary to determine that the center of the square worktable and the center of all the track groups at the same height overlap each other. Then each sub-motor 1 will be evenly distributed on the worktable. Finally, the moving iron core 3 is fixedly connected to the corresponding worktable.

[0026] After the moving core 3 is powered on, it can drive the equipment to move. All the sub-motors 1 are connected to the central control system, and their operating parameters can be controlled individually or together. However, in order to keep the equipment as stable as possible during movement, it is usually not allowed to turn or deviate. Different sub-motors 1 can also be used in parallel or series. In this way, multiple sub-motors 1 are regarded as a whole, and their movement can be controlled uniformly, which significantly reduces costs and control difficulty. Taking the equipment to be moved as a square worktable as an example, between the tracks in the same group, the sub-motors 1 that are aligned front and back are connected in parallel, and the sub-motors 1 in the same track are connected in series. In this way, when controlling the sub-motors 1, the moving cores inside a row or column of sub-motors 1 move together.

[0027] In this invention, multiple smaller sub-motors 1 are used to replace the previous larger linear motor for moving the equipment. First, the original single strong electromagnetic coupling phenomenon is decomposed into multiple weaker electromagnetic coupling phenomena, which is equivalent to performing electromagnetic decoupling directly. Second, for each sub-motor 1, its own electromagnetic coupling has minimal impact on other sub-motors 1. That is, changing the motor thrust of a certain sub-motor 1 will only affect that sub-motor 1, while other sub-motors 1 will remain normal and will not significantly affect the entire DC motor itself, thus weakening the impact of electromagnetic coupling. Furthermore, for sub-motors 1 in different positions, the operator can adjust the operating parameters of one or more sub-motors 1 according to the strength of electromagnetic coupling during operation.

[0028] In practical use, the embodiments proposed in this invention also have the following characteristics: (1) The equipment is not easily deformed by normal force. In this embodiment, the linear motor is composed of multiple sub-motors 1. When acting on the device, on the one hand, the normal forces generated on different sub-motors 1 are not constant and will cancel each other out until they are balanced. On the other hand, the normal forces are distributed at different positions of the device along with the sub-motors 1, and are relatively dispersed, making it difficult for the device to deform during movement. (2) Good overall heat dissipation performance Multiple sub-motors are set up separately with a large gap in between, which increases the passive heat dissipation area and facilitates the use of active heat dissipation methods such as fans, making the linear motor more stable and reliable during operation. (3) The positioning accuracy of the moving core 3 is relatively high. By adjusting the operating parameters of the moving core 3 of the sub-motor 1 at different positions during operation, the cogging effect of the moving core 3 can be reduced. Even if the cogging effect of some sub-motor 1 is still relatively severe, the impact on the overall linear motor is small, thus affecting the positioning accuracy of the moving core 3 during operation. (4) Relatively energy-efficient In actual use, a single sub-motor 1 can be adjusted or stopped to reduce the overall power consumption, which is more energy-efficient and environmentally friendly.

[0029] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An electromagnetic decoupling method for a linear motor, characterized in that, Includes the following steps: Step S1: The linear motor is equipped with multiple sub-motors (1), each sub-motor (1) including a magnetic rail (2) and a moving iron core (3) located on the side of the magnetic rail (2); Step S2: Define one or more parallel tracks at the same height, each track containing multiple sub-motors arranged linearly within the track (1). Step S3: Determine the device to be moved. Based on the shape and mass distribution of the device to be moved, connect the corresponding position of the device to the moving core (3) of the corresponding sub-motor (1) of the corresponding track.

2. The electromagnetic decoupling method according to claim 1, characterized in that: In step S2, when there are multiple tracks, the tracks are divided into one or more groups. The tracks in the same group are arranged in parallel with the same spacing. The number of sub-motors (1) in different tracks is the same. The sub-motors (1) in the same track are arranged linearly with the same spacing.

3. The electromagnetic decoupling method according to claim 2, characterized in that: Adjacent sub-motors (1) located in the same track have their magnetic tracks (2) in contact with each other, forming a continuous magnetic track (2) in the track.

4. The electromagnetic decoupling method according to claim 3, characterized in that: Within the same set of tracks, the sub-motors (1) that are aligned front to back are connected in parallel, and the sub-motors (1) within the same track are connected in series.

5. The electromagnetic decoupling method according to claim 1, characterized in that: In step S1, the magnetic track (2) inside the sub-motor (1) is vertically arranged, and the moving iron core (3) is located on the left and right sides of the magnetic track (2).

6. The electromagnetic decoupling method according to claim 1, characterized in that: In step S1, the magnetic track (2) inside the sub-motor (1) is set horizontally, and the moving iron core (3) is set on the upper and lower sides of the magnetic track (2).

7. The electromagnetic decoupling method according to claim 1, characterized in that: In step S2, multiple tracks located at different altitudes are also included, and tracks located at the same altitude form an orbital array at that altitude.

8. The electromagnetic decoupling method according to claim 2, characterized in that: When the device to be moved is a square plate structure with uniform mass, the moving core (3) of the sub-motor (1) is connected to the device to be moved based on the principle that the square center of the device to be moved overlaps with the center of all track groups.

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