CN111092532A - Linear motor - Google Patents
Linear motor Download PDFInfo
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- CN111092532A CN111092532A CN201811244765.4A CN201811244765A CN111092532A CN 111092532 A CN111092532 A CN 111092532A CN 201811244765 A CN201811244765 A CN 201811244765A CN 111092532 A CN111092532 A CN 111092532A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K41/00—Propulsion systems in which a rigid body is moved along a path due to dynamo-electric interaction between the body and a magnetic field travelling along the path
- H02K41/02—Linear motors; Sectional motors
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Abstract
The invention provides a linear motor which comprises a primary assembly and a secondary assembly, wherein the secondary assembly comprises a magnetic conduction substrate and a conductive substrate arranged on the magnetic conduction substrate. The conductive substrate is provided with a plurality of grooves which are spaced from each other in the length direction of the conductive substrate, the grooves form resistance increasing areas, and the extending direction of the grooves is perpendicular to the length direction of the conductive substrate; and the grooves do not extend to the two side edges of the conductive substrate in the width direction of the conductive substrate, so that the conductive substrate is provided with a plurality of mutually separated eddy currents in the length direction of the conductive substrate by the primary assembly, and the current in the eddy currents can flow along the width direction of the conductive substrate, so that the effective component of the eddy currents is increased, the ineffective component is reduced, the electromagnetic thrust output capacity of the linear motor is increased, and the performance of the linear motor can be improved to a certain degree.
Description
Technical Field
The invention relates to the technical field of rail transit, in particular to a linear motor for the field of rail transit, and particularly relates to a short-stator linear asynchronous motor.
Background
The linear motor structure forms in the wheel-rail traffic linear motor driving field and the medium-low speed magnetic levitation field are short stator linear asynchronous motors, the short stators are installed on the vehicle body, and the long secondary is laid on the track and is consistent with the length of the track.
The long secondary structure is slightly different according to different application fields, but the materials are all aluminum-iron composite secondary structures, namely, a conductive substrate formed by covering a copper plate or an aluminum plate on a magnetic conductive substrate of a steel bracket used as a secondary magnetic yoke. The magnetic conductive substrate serving as the secondary yoke functions as a magnetic path, and corresponds to a secondary core of the rotating electrical machine, and a copper plate or an aluminum plate covered on the magnetic conductive substrate functions as an electric conductor.
Fig. 1 is a top view and a side view of a basic structure of a conductive substrate of a linear motor using an aluminum-iron composite secondary structure in the related art, in which the conductive substrate is formed by press molding.
When the primary winding is electrified and passes through the upper part of the secondary winding, the conductive substrate of the composite secondary winding induces eddy current, and the eddy current field interacts with a traveling wave magnetic field generated by the primary winding to generate electromagnetic force required by a vehicle. However, since the conductive substrate is a monolithic structure, the flow path of the eddy current field is not parallel to the width direction of the conductive substrate, as shown in fig. 2. As shown in fig. 3, the eddy current flows in the conductive substrate, and the eddy current is composed of a current component Ix parallel to the longitudinal direction (traveling magnetic field advancing direction) and a current component Iy parallel to the width direction of the conductive substrate. The eddy current component Iy parallel to the width direction of the conductive substrate and the traveling wave magnetic field interact to generate electromagnetic thrust/braking force required by the linear motor, the eddy current component Ix simply increases the eddy current loss of the conductive substrate, and no electromagnetic force is output.
In order to solve the above problems, chinese patent application CN201310323983.8 relates to a grid-shaped linear motor secondary device for linear motor rail transit, which includes a magnetically conductive iron core, a conductor and a mounting bracket, wherein the conductor includes a set of grid-shaped arranged conductive bars and conductive end bars connecting the ends of adjacent conductive bars. The magnetic conductive iron core is provided with an installation notch matched with the conductive conducting bar, wherein the conductive conducting bar is embedded in the installation notch, the two end parts of the conductive conducting bar extend out of the installation notch, the conductive end bars are arranged on the side part of the magnetic conductive iron core, and the magnetic conductive iron core is arranged on the installation bracket.
Furthermore, the linear motor secondary proposed by chinese patent application CN201420143661.5 includes a magnetic conductor with a groove on the surface and a conductive bar mounted in the groove. The utility model discloses a change linear electric motor secondary current conducting plate into the stripe structure by whole piece formula, the vortex that appears in the busbar can effectively be reduced to the stripe structure to the eddy current loss in the busbar has been reduced.
Said invention is aimed at improving the structure of secondary conducting plate and magnetic conducting plate, making it approach to cast aluminium rotor structure, reducing eddy current of conducting bar and raising performance of linear motor. However, the application of the structure in the short stator linear asynchronous motor for rail transit has the following problems:
1) the magnetic conduction substrate is changed into a structure with secondary grooves from the original integral steel plate structure, so that the processing cost is increased;
2) the conductive substrate is changed from an integral aluminum plate structure to an aluminum conducting bar structure, so that the manufacturing cost is increased;
3) the end part of the aluminum conducting bar needs to be welded, the manufacturing cost is increased, the welding difficulty of the aluminum bar is high, and the welding defects such as poor welding and the like easily exist.
In summary, the secondary structure proposed by the above invention increases the cost and reduces the reliability.
Disclosure of Invention
In order to solve the problems in the prior art, the secondary structure of the linear motor provided by the invention can effectively reduce the secondary eddy current loss and improve the performance index of the linear motor, and meanwhile, the linear motor is simple in structure and the manufacturing cost cannot be obviously increased.
The invention provides a linear motor which comprises a primary assembly and a secondary assembly, wherein the secondary assembly comprises a magnetic conduction substrate and a conductive substrate arranged on the magnetic conduction substrate. The conductive substrate 10 has a plurality of grooves spaced from each other in a length direction of the conductive substrate, and an extending direction of the grooves is perpendicular to the length direction of the conductive substrate; and the grooves do not extend to both side edges of the conductive substrate in the width direction of the conductive substrate.
Preferably, the spacing distance between adjacent grooves in the plurality of mutually spaced grooves is three times the width of the grooves; and/or the distance between the end part of the groove in the width direction of the conductive substrate and the two side edges of the conductive substrate is twice of the width of the groove.
Preferably, the magnetically conductive substrate comprises a plurality of magnetically conductive stacks arranged sequentially along a length of the magnetically conductive substrate.
The invention provides a linear motor, which comprises a primary component and a secondary component, wherein the secondary component comprises a magnetic conduction substrate and a conductive substrate arranged on the magnetic conduction substrate, the conductive substrate is provided with a plurality of mutually-spaced resistance increasing areas in the length direction of the conductive substrate, and the extending direction of the resistance increasing areas is vertical to the length direction of the conductive substrate; and the resistance increasing region does not extend to both side edges of the conductive substrate in the width direction of the conductive substrate.
Preferably, the resistance-increased region is formed in a long strip shape.
Preferably, the distance between adjacent ones of the plurality of mutually spaced resistance increase regions is three times the width of the resistance increase region; and/or the distance between the end of the resistance increasing region in the width direction of the conductive substrate and the two side edges of the conductive substrate is twice the width of the resistance increasing region.
Preferably, the magnetically conductive substrate comprises a plurality of magnetically conductive stacks arranged sequentially along a length of the magnetically conductive substrate.
The invention provides a linear motor which comprises a primary assembly and a secondary assembly, wherein the secondary assembly comprises a magnetic conduction substrate and a conductive substrate arranged on the magnetic conduction substrate, the conductive substrate induces a plurality of mutually separated eddy currents in the length direction of the conductive substrate by the primary assembly, and the current in the eddy currents can flow along the width direction of the conductive substrate.
Preferably, the magnetically conductive substrate comprises a plurality of magnetically conductive stacks arranged sequentially along a length of the magnetically conductive substrate.
The invention has the beneficial effects that:
by adopting the technical scheme of the invention, on the basis of unchanging the structural size of the conductive substrate, the conductive area and the resistivity are changed through simple local processing, so that the circulation path of the eddy current is planned, the effective component of the eddy current is increased, the ineffective component is reduced, the electromagnetic thrust output capacity of the linear motor is increased, and the performance of the linear motor can be improved to a certain degree.
Drawings
The foregoing summary, as well as the following detailed description of the invention, will be better understood when read in conjunction with the appended drawings. It is to be noted that the appended drawings are intended as examples of the claimed invention. In the drawings, like reference characters designate the same or similar elements.
Fig. 1 is a schematic top view of a basic structure of a conductive substrate of a linear motor adopting an aluminum-iron composite secondary structure in the prior art.
Fig. 2 is a schematic diagram of an induced current of the conductive substrate in fig. 1.
Fig. 3 is a schematic diagram of an induced current of the conductive substrate in fig. 1.
Fig. 4 is a side view of the basic structure of the magnetic conductive substrate of the linear motor adopting the aluminum-iron composite secondary structure according to the present invention.
Fig. 5 is a schematic top view of the basic structure of the conductive substrate of the linear motor using the al-fe composite secondary structure according to the present invention.
Fig. 6 is a side view schematically showing the basic structure of the conductive substrate of the linear motor using the al-fe composite secondary structure according to the present invention.
Fig. 7 is a schematic diagram of an induced current of the conductive substrate in fig. 4.
Detailed Description
The detailed features and advantages of the present invention are described in detail in the detailed description which follows, and will be sufficient for anyone skilled in the art to understand the technical content of the present invention and to implement the present invention, and the related objects and advantages of the present invention will be easily understood by those skilled in the art from the description, claims and drawings disclosed in the present specification.
The present embodiment relates to a linear motor, which includes a primary assembly (not shown) and a secondary assembly 1, fig. 4 shows a secondary structure 1 of the linear motor of the present invention, wherein the secondary assembly includes a magnetic conductive substrate 20 and an electric conductive substrate 10 disposed on the magnetic conductive substrate 20, and the magnetic conductive substrate 20 and the electric conductive substrate 10 are connected by a bolt 23. When the primary winding in the primary assembly is energised and passes over the secondary assembly 1, eddy currents e are induced in the conductive substrate 10 of the secondary assembly which interact with the travelling magnetic field generated by the primary winding to generate the electromagnetic thrust/braking force required by the linear motor required by the vehicle.
Fig. 5 shows a side view of a basic structure of a conductive substrate 10 of a linear motor adopting an aluminum-iron composite secondary structure according to the present invention, wherein the conductive substrate 10 has a plurality of grooves 11 spaced apart from each other in a length direction ld of the conductive substrate 10, an extending direction of the grooves 11 is perpendicular to the length direction ld of the conductive substrate 10, i.e., parallel to a width direction wd of the conductive substrate, and the grooves 11 do not extend to both side edges of the conductive substrate 10 in the width direction wd of the conductive substrate 10. Specifically, the width sw of each groove 11 is 5mm, and the distance d between the end of each groove 11 in the width direction wd and both side edges of the conductive substrate 10 may be 10mm, and the spacing distance s between adjacent grooves in the plurality of mutually spaced grooves 11 may be 15 mm. In other words, a distance d between an end of the groove 11 in the width direction wd of the conductive substrate 10 and both side edges of the conductive substrate 10 is twice the width sw of the groove 11, and a spacing distance s between adjacent grooves in the plurality of mutually spaced grooves 11 is three times the width sw of each groove 11. The dimensions of the grooves are provided for reference, and the design can be made in consideration of the structural strength and the current flow capacity in practical use.
As shown in fig. 7, the conductive substrate 10 can induce a plurality of mutually separated eddy currents by the primary assembly in the length direction ld of the conductive substrate 10. Since the plurality of grooves 11 are spaced from each other on the conductive substrate 10, the conductive area at the grooves 11 is reduced, and the resistivity is increased, and the grooves 11 form an example of the resistance increasing region of the present invention, so as to force the induced current on the conductive layer to flow along a specified path, and to some extent, define the flow path of the eddy current. Specifically, as shown in fig. 7, the current of the eddy current s1 in the region a can flow along the width direction wd of the conductive substrate 10. Thus, eddy current s1 is substantially composed of Iy component and the reactive current Ix is small. Therefore, on the premise that the eddy current is constant, the current component Iy participating in energy conversion is increased, the electromagnetic thrust output capacity of the linear motor is increased, and the performance of the linear motor can be improved to a certain degree.
In particular, in this embodiment, the non-communicating groove is formed on the conductive substrate 10 instead of the communicating punched hole, so that the smooth surface is formed on the conductive substrate while the eddy current effect is reduced and the motor performance is improved, and the foreign matter does not enter the groove, thereby reducing the driving risk.
Preferably, the magnetic conductive substrate 20 includes a plurality of magnetic conductive blocks 21 sequentially arranged along the length direction ld of the magnetic conductive substrate 20, that is, the magnetic conductive substrate 20 is a block structure composed of the plurality of magnetic conductive blocks 21.
The magnetic conductive substrate 20 is a steel plate and has a certain conductivity; the eddy currents in the monolithic magnetically permeable substrate 20 reduce the thrust output and other performance metrics of the linear motor. The adoption of the segmented magnetic conduction substrate 20 can effectively reduce the secondary eddy current in the magnetic conduction substrate 20 and improve the traction output and other performance indexes, for example, the same primary current input, and the segmented magnetic conduction substrate 20 consisting of the segmented magnetic conduction substrate and the plurality of magnetic conduction stacked blocks 21 can increase the thrust by 10%.
Although the present invention has been described with reference to the present specific embodiments, it will be appreciated by those skilled in the art that the above embodiments are merely illustrative of the present invention, and various equivalent changes and substitutions may be made without departing from the spirit of the invention, and therefore, it is intended that all changes and modifications to the above embodiments within the spirit and scope of the present invention be covered by the appended claims.
Claims (7)
1. A linear electric motor comprising a primary assembly and a secondary assembly, the secondary assembly comprising:
a magnetically conductive substrate serving as a secondary yoke, and
set up and be in electrically conductive base plate on the magnetic conduction base plate, its characterized in that:
the conductive substrate is provided with a plurality of grooves which are spaced from each other in the length direction of the conductive substrate, and the extending direction of the grooves is perpendicular to the length direction of the conductive substrate; and is
The grooves do not extend to both side edges of the conductive substrate in the width direction of the conductive substrate.
2. A linear motor according to claim 1, wherein:
the spacing distance between adjacent grooves in the plurality of mutually spaced grooves is three times the width of the grooves; and/or
The distance between the end part of the groove in the width direction of the conductive substrate and the two side edges of the conductive substrate is twice of the width of the groove.
3. A linear electric motor comprising a primary assembly and a secondary assembly, the secondary assembly comprising:
a magnetically conductive substrate serving as a secondary yoke, and
a conductive substrate disposed on the magnetically permeable substrate, wherein,
the conductive substrate is provided with a plurality of mutually-spaced resistance increasing areas in the length direction of the conductive substrate, and the extending direction of the resistance increasing areas is perpendicular to the length direction of the conductive substrate; and is
The resistance increase region does not extend to both side edges of the conductive substrate in the width direction of the conductive substrate.
4. A linear motor according to claim 3, wherein: the resistance increase region is formed in a long shape.
5. A linear motor according to claim 4, characterized in that:
the spacing distance between adjacent resistance increasing regions in the plurality of mutually spaced resistance increasing regions is three times the width of the resistance increasing regions; and/or
The distance between the end of the resistance increasing region in the width direction of the conductive substrate and the two side edges of the conductive substrate is twice the width of the resistance increasing region.
6. A linear electric motor comprising a primary assembly and a secondary assembly, the secondary assembly comprising:
a magnetically conductive substrate serving as a secondary yoke, and
a conductive substrate disposed on the magnetically permeable substrate, wherein,
the conductive substrate induces a plurality of mutually separated electric eddy currents in a length direction of the conductive substrate by the primary assembly, and an electric current in the electric eddy currents can flow in a width direction of the conductive substrate.
7. The linear motor according to any one of claims 1, 3, and 6, wherein the magnetically conductive base plate includes a plurality of magnetically conductive blocks arranged in succession along a length direction of the magnetically conductive base plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811244765.4A CN111092532A (en) | 2018-10-24 | 2018-10-24 | Linear motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811244765.4A CN111092532A (en) | 2018-10-24 | 2018-10-24 | Linear motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111092532A true CN111092532A (en) | 2020-05-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811244765.4A Pending CN111092532A (en) | 2018-10-24 | 2018-10-24 | Linear motor |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011130527A (en) * | 2009-12-15 | 2011-06-30 | Hitachi Ltd | Reaction plate of linear induction motor |
| CN108599518A (en) * | 2018-05-09 | 2018-09-28 | 株洲市科达电机技术有限公司 | A kind of combined type tablet and line inductance electromotor for line inductance electromotor |
-
2018
- 2018-10-24 CN CN201811244765.4A patent/CN111092532A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011130527A (en) * | 2009-12-15 | 2011-06-30 | Hitachi Ltd | Reaction plate of linear induction motor |
| CN108599518A (en) * | 2018-05-09 | 2018-09-28 | 株洲市科达电机技术有限公司 | A kind of combined type tablet and line inductance electromotor for line inductance electromotor |
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Application publication date: 20200501 |