Electromagnetic decoupling method for a linear motor

Abstract

The application discloses a kind of electromagnetic decoupling methods of linear motor, it includes the following steps: step S1, multiple sub-motors are arranged, each sub-motor includes magnet track and mover core located in the side of magnet track;Step S2, one or more parallel and at the same height tracks are defined, each track contains multiple and linearly arranged sub-motors in the track;Step S3, determine the equipment to be moved, according to the shape quality distribution of the equipment to be moved, the corresponding position transmission connection of the equipment to be moved is connected to the mover core of the corresponding sub-motor of the corresponding track.The beneficial effects of the present application are that the linear motor is divided into multiple sub-motors, the electromagnetic coupling effect in the operation process is dispersed and weakened, and the operation parameters of the specific sub-motor can be adjusted individually, and the electromagnetic decoupling is carried out.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of linear motor, and particularly relates to a method for electromagnetic decoupling of a linear motor. BACKGROUND

[0002] As a special motor that directly converts electrical energy into linear mechanical energy, the linear motor has been widely used in the fields of industrial production, transportation, and automation equipment in recent years. The linear motor mainly comprises a mover iron core and a magnetic track. When the coil in the mover iron core is electrified, the magnetic track moves along the magnetic track under the action of the magnetic field of the magnetic track.

[0003] During the operation of the linear motor, there is a serious electromagnetic coupling phenomenon, mainly including the coupling between the motor thrust and the magnetic flux and the coupling between the motor thrust and the normal force. These coupling relationships make the control of the motor complex and difficult to achieve high-precision control. In addition, the existing linear motor also has at least the following problems during the actual operation of the motor: there is a large normal force between the mover iron core and the magnetic track, the normal force acts on the equipment to make it easily deformed under additional pressure; a large amount of heat is generated in the coil inside the mover iron core after electrification, which affects the stability of the motor during operation; the periodic cogging effect occurs between the magnetic fields of the mover iron core and the magnetic track, which affects the positioning accuracy of the mover iron core; the overall power consumption is large, and it is not energy-saving and environmentally friendly.

[0004] The process of weakening the electromagnetic coupling phenomenon of the linear motor during operation is electromagnetic decoupling. At present, electromagnetic decoupling is mostly achieved by directly adjusting the relevant parameters during the operation of the linear motor, such as the motor magnetic field, the motor winding, and the motor temperature, which can alleviate the influence of the electromagnetic coupling phenomenon to a certain extent. However, the above method directly acts on the whole linear motor. On the one hand, the change of some operating parameters may affect the operation of the whole linear motor, and a large number of tests are required each time the parameters are adjusted, which is relatively inconvenient. On the other hand, the electromagnetic coupling conditions at different positions of the linear motor are often quite different, and it is difficult to take into account the adjustment. In addition, it is also unable to solve many other problems during the operation of the linear motor. SUMMARY

[0005] The present application aims to design a method for electromagnetic decoupling of a linear motor, and the main purpose is to overcome the defects of the existing methods for solving the electromagnetic coupling phenomenon and to solve other problems during the operation of the linear motor.

[0006] The present application provides a method for electromagnetic decoupling of a linear motor, which comprises the following steps:

[0007] Step S1, a plurality of sub-motors are arranged in the linear motor, and each sub-motor comprises a magnetic track and a mover iron core located on the side of the magnetic track;

[0008] Step S2, one or more parallel and at the same height of the track, each track contains a plurality of and linearly arranged within the track sub-motor;

[0009] Step S3, determine the device to be moved, according to the shape of the mass distribution of the device to be moved, the corresponding position of the moving device is drivingly connected to the mover core of the corresponding sub-motor of the corresponding track.

[0010] Further, in step S2, when a plurality of tracks are provided, 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 the different tracks is the same, and the sub-motors in the same track are linearly arranged with the same spacing.

[0011] Further, the adjacent sub-motors in the same track are in contact with each other, and form a continuous magnetic track in the track.

[0012] Further, in the same group of tracks, the front and rear parallel sub-motors are connected in parallel with each other, and the sub-motors in the same track are connected in series with each other.

[0013] Optionally, in step S1, the magnetic track in the sub-motor is vertically arranged, and the mover core is also vertically arranged on the left and right sides of the magnetic track.

[0014] Optionally, in step S1, the magnetic track in the sub-motor is horizontally arranged, and the mover core is also horizontally arranged on the upper and lower sides of the magnetic track.

[0015] Further, in step S2, a plurality of tracks at different heights are also included, and the tracks at the same height form a track array at the height.

[0016] Further, when the device to be moved is a square plate structure with uniform mass, the mover core of the sub-motor is drivingly connected to the device to be moved according to the principle that the square center of the device to be moved overlaps with the center of all track groups.

[0017] The electromagnetic decoupling method of the linear motor provided in the present application directly disperses and weakens the electromagnetic coupling phenomenon generated by the linear motor by replacing the previous larger motor with multiple smaller sub-motors, and the operator can adjust the parameters of a certain sub-motor according to the condition of the sub-motor in operation to weaken the electromagnetic coupling phenomenon generated by the sub-motor, without affecting other sub-motors and without excessively interfering with the operation of the equipment. In addition, since the sub-motors are divided into multiple sub-motors, the normal forces generated in the sub-motors will cancel each other out, so that the equipment is not easy to deform due to the action of the normal force; the dispersed sub-motor structure facilitates heat dissipation and improves the stability during operation; the cogging effect generated in the sub-motors is small and will also cancel out part of it between the sub-motors, reducing the influence on the positioning accuracy of the mover iron core during movement; a certain sub-motor can be adjusted individually, reducing the power consumption and being more energy-saving and environmentally friendly. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 Flowchart of the present application;

[0019] Figure 2 Schematic diagram of the three-dimensional structure of the linear motor in the present application.

[0020] The correspondence between the reference numbers of the various drawings in the figure and the component names is as follows:

[0021] 1, sub-motor; 2, magnetic track; 3, mover iron core. DETAILED DESCRIPTION

[0022] The technical solutions of the present application will be described below in conjunction with the embodiments.

[0023] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not intended to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0024] In addition to indicating the orientation or positional relationship, some of the above terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain attachment relationship or connection relationship in some cases. For those skilled in the art, the specific meaning of these terms in the present application can be understood according to the specific situation.

[0025] As Figure 1 and Figure 2As shown, the present application proposes a specific embodiment, which is an electromagnetic decoupling method of linear motor, the overall idea is to replace the existing single larger linear motor with multiple smaller sub-motor 1, and then realize the effect of electromagnetic decoupling, the flow chart is shown in Figure 1 , specifically including the following steps:

[0026] Step S1, setting sub-motor 1

[0027] The linear motor contains multiple sub-motors 1 independent of each other, referring to Figure 2 As shown, at the same height, a plurality of sub-motors 1 are arranged along two vertical squares in turn, each sub-motor 1 includes a magnetic track 2 and a mover core 3 located at the side of the magnetic track 2, the mover cores 3 of all sub-motors 1 are connected with the power supply and central control system, a plurality of permanent magnets are arranged on the two largest side surfaces of the magnetic track 2, the N and S poles of adjacent permanent magnets are staggered, and the mover core 3 is moved along the magnetic track 2 after being electrified.

[0028] According to different specific use scenarios, the magnetic track 2 in the sub-motor 1 can be arranged vertically or horizontally, when the magnetic track 2 is arranged vertically, the permanent magnets are arranged vertically on the left and right sides of the magnetic track 2, and the mover core 3 is also arranged vertically on the left and right sides of the magnetic track 2. When the magnetic track 2 is arranged horizontally, the permanent magnets are arranged horizontally on the upper and lower sides of the magnetic track 2, and the mover core 3 is also arranged horizontally on the upper and lower sides of the magnetic track 2. Figure 2 The magnetic track 2 and the mover core 3 in the above are both arranged horizontally.

[0029] Step S2, setting the track and the position of the sub-motor 1

[0030] One or more parallel tracks at the same height are defined, and then a plurality of sub-motors 1 are arranged in each track, usually the number of sub-motors 1 in each track is the same and linearly arranged in the track; on the basis of the above, when there are multiple tracks, the tracks can also be divided into one or more groups, wherein the tracks in the same group are arranged in parallel with the same spacing, and the sub-motors 1 in the track are linearly arranged with the same spacing, after that, all sub-motors 1 are arranged in a matrix, in addition, when the number of track groups is an even number, the tracks can also be arranged in pairs of symmetrical mirror image.

[0031] Further, the distance between adjacent sub-motors 1 in the same track can also be zero at this time, that is, the adjacent magnetic tracks 2 are in contact with each other, finally forming a continuous magnetic track 2 in the track, so as to increase the distance that the mover core 3 can move along the magnetic track 2, or the sub-motors 1 in the same track can be regarded as a whole, only one integrated magnetic track 2 is arranged, and then a plurality of parallel mover cores 3 are arranged on the side of the magnetic track 2.

[0032] Further, the tracks can also be of different heights, with tracks at the same height constituting a track array at that height, and track arrays at different heights corresponding to linear motors at different heights. This method of arranging linear motors at different heights greatly saves space.

[0033] Step S3, installing the device to be moved

[0034] The device to be moved is determined, and the corresponding position of the device to be moved is drivingly connected to the mover core 3 of the corresponding sub-motor 1 of the corresponding track according to the shape and mass distribution of the device to be moved. Here, the determination of the corresponding position of the device to be moved and the mover core 3 of the corresponding sub-motor 1 can be made by finite element analysis or other methods, the device to be moved is decomposed into multiple simpler structures, and then the mass center distribution of each part is determined, the appropriate position of the sub-motor 1 is selected, and the mover core 3 is drivingly connected to the device to be moved.

[0035] Generally, the device to be moved by the linear motor is usually a workbench, and the specific machining workpiece is arranged on the workbench. Such a workbench can be basically simplified as a square plate structure with uniform mass. At this time, only the square center of the workbench and the center of all track groups at the same height need to be determined, and they are overlapped with each other. At this time, each sub-motor 1 is uniformly distributed on the workbench, and finally the mover core 3 is fixedly connected to the corresponding workbench.

[0036] After the mover core 3 is connected to the power supply, the device can be moved, and all 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 device as stable as possible during movement, the device usually cannot turn or deviate. Different sub-motors 1 can also be used in parallel or series combination. In this way, multiple sub-motors 1 are regarded as a whole, and their movement can be controlled uniformly, which significantly reduces the cost and control difficulty. Taking the square workbench as an example, the front and rear parallel sub-motors 1 are connected in parallel between the same group of tracks, and the sub-motors 1 in the same track are connected in series. In this way, when the sub-motors 1 are controlled, the mover cores inside the sub-motors 1 in a row or a column move together.

[0037] In the present application, the device is moved by replacing the previous larger linear motor with multiple smaller sub-motors 1. Firstly, the original single strong electromagnetic coupling phenomenon is decomposed into multiple weaker electromagnetic coupling phenomena, which is equivalent to directly decoupling the electromagnetism. Secondly, for each sub-motor 1, its own electromagnetic coupling has little effect on other sub-motors 1, that is, changing the motor thrust of a certain sub-motor 1 will only affect that sub-motor 1, and other sub-motors 1 remain normal and will not significantly affect the entire DC motor itself, thereby weakening the influence of electromagnetic coupling phenomenon. Moreover, for sub-motors 1 at different positions, the operator can adjust the operating parameters of a certain sub-motor 1 or several sub-motors 1 according to the strength of electromagnetic coupling during operation.

[0038] In actual use, the embodiments proposed in the present application also have the following characteristics:

[0039] (1) The device is not easily deformed by the action of the normal force

[0040] The linear motor in this embodiment 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 always the same and will cancel each other out until equilibrium. On the other hand, the normal forces are distributed at different positions of the device by the sub-motors 1, which are relatively dispersed and difficult to cause deformation of the device during movement;

[0041] (2) Good overall heat dissipation performance

[0042] Multiple sub-motors 1 are separately arranged, leaving a large number of gaps in between, which increases the passive heat dissipation area and facilitates the use of active heat dissipation means such as fans, making the linear motor more stable and reliable during operation;

[0043] (3) High positioning accuracy of the mover core 3

[0044] By adjusting the operating parameters of the mover core 3 of the sub-motors 1 at different positions during operation, the cogging effect of the mover core 3 can be reduced. Even if the cogging effect of individual sub-motors 1 is still relatively severe, the overall impact on the linear motor is relatively small, so that the positioning accuracy of the mover core 3 during operation is affected;

[0045] (4) Energy saving

[0046] In actual use, a certain sub-motor 1 can be adjusted or stopped individually to reduce the overall power consumption, which is more energy-saving and environmentally friendly.

[0047] The above merely provides the specific implementation of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method of electromagnetic decoupling of a linear motor, characterized in that, The method comprises the following steps: Step S1, a plurality of sub-motors (1) are arranged in the linear motor, each sub-motor (1) comprises a magnetic track (2) and a mover iron core (3) arranged on the side of the magnetic track (2); Step S2, one or more parallel tracks at the same height are defined, each track comprises a plurality of sub-motors (1) arranged linearly in the track; Step S3, a device to be moved is determined, and the mover iron core (3) of the corresponding sub-motor (1) of the corresponding track is drivingly connected to the corresponding position of the device to be moved according to the shape and mass distribution of the device to be moved; In step S2, when a plurality of tracks are arranged, 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, and the sub-motors (1) in the same track are arranged linearly with the same spacing.

2. The electromagnetic decoupling method of claim 1, wherein: The magnetic tracks (2) of adjacent sub-motors (1) in the same track are in contact with each other, and a continuous magnetic track (2) is formed in the track.

3. The electromagnetic decoupling method of claim 2, wherein: In the same group of tracks, the front and rear sub-motors (1) are parallel to each other, and the sub-motors (1) in the same track are connected in series.

4. The electromagnetic decoupling method of claim 1, wherein: In step S1, the magnetic track (2) in the sub-motor (1) is vertically arranged, and the mover iron core (3) is arranged on the left and right sides of the magnetic track (2).

5. The electromagnetic decoupling method of claim 1, wherein: In step S1, the magnetic track (2) in the sub-motor (1) is horizontally arranged, and the mover iron core (3) is arranged on the upper and lower sides of the magnetic track (2).

6. The electromagnetic decoupling method of claim 1, wherein: In step S2, a plurality of tracks at different heights are further included, and the tracks at the same height form a track array at the height.

7. The electromagnetic decoupling method of claim 1, wherein: When the device to be moved is a square plate structure with uniform mass, the mover iron core (3) of the sub-motor (1) is drivingly connected to the device to be moved in the principle that the square center of the device to be moved overlaps the center of all track groups.

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