CN203761240U - Silicon steel sheet, iron core linear motor, linear motor platform and LED test classification equipment - Google Patents

Abstract

The utility model discloses a silicon steel sheet, an iron core linear motor, a linear motor platform and LED testing and classification equipment. The side teeth of the silicon steel sheet are partially or completely removed. Correspondingly, the iron core formed by stacking silicon steel sheets has no side teeth, or the height of the side teeth is lower than that of the middle teeth. By adopting such a silicon steel sheet design and the corresponding iron core, the cogging force of the iron-core linear motor can be reduced, and the mass of the iron core can also be reduced, and a high-speed, high-acceleration, and high-precision linear motor platform can be realized.

Description

Silicon steel sheet, iron core linear motor, linear motor platform and LED testing and sorting equipment

technical field

The utility model relates to a silicon steel sheet, an iron-core linear motor, a linear motor platform and LED testing and classification equipment. A plurality of silicon steel sheets are stacked to form an iron core of an iron-core linear motor, and the linear motor platform includes two iron-core linear motors.

Background technique

Iron core linear motors have been widely used.

Figure 1 is a schematic diagram of an iron core linear motor.

As shown in FIG. 1 , the iron core linear motor includes a stator part 100 and a mover part 200 , and the mover part 200 can move relative to the stator part 100 .

A magnet array 110 is disposed on the stator part 100 . An iron core 210 is disposed on the mover part 200 . The iron core 210 has a plurality of slots (not shown in FIG. 1 ) into which a plurality of coils (not shown in FIG. 1 ) are respectively embedded.

FIG. 2 schematically shows an iron core 210 and a coil 220 used in a conventional iron core linear motor. The iron core 210 has two side teeth 211 and a plurality of middle teeth 212 . There are slots 214 between the side teeth 211 and the middle teeth 212 and between each middle teeth 212 . The coil 220 is wound on the middle tooth 212 and embedded in the slot 214 . The side teeth 211 close off the sides of the coil 220 .

Due to the iron core, the mass of the mover part of the iron core linear motor will be relatively large. Larger mover mass is not conducive to improved acceleration performance and precise control.

On the other hand, the iron core generally needs to be slotted in order to embed the coil in the iron core, so the inductance of the motor will be relatively large, and the excitation of the motor will lag behind, and the slotting of the iron core will bring the unique cogging of the iron core linear motor force.

Using the traditional iron core shown in Figure 2, the cogging force is generally equivalent to about 8 to 10% of the effective driving force of the motor. That is to say, for the effective output force of the motor of 1000N, the cogging force is about 80-100N.

In the design of the iron core linear motor, the core is to reduce the cogging force and the mass of the mover as much as possible. Common methods to reduce cogging force include closed or semi-closed cogging, dislocation of magnetic poles or cogging, oblique poles or helical teeth, adding auxiliary slots, optimal slot number and magnetic pole number combination design, etc. One or more methods can be used. Various methods are combined to reduce the cogging force of the iron core motor.

However, when designing a motor, it is often necessary to consider multiple factors comprehensively and seek a better compromise solution in multiple aspects.

Utility model content

The technical problem to be solved by the utility model is to provide an iron-core linear motor and a linear motor platform, as well as silicon steel sheets used to laminate the iron core of the iron-core linear motor, which can effectively reduce the motor cogging force and the mover Quality, to achieve the goal of small cogging force, high acceleration and large output force of iron core linear motor.

According to one aspect of the present invention, there is provided a silicon steel sheet, comprising: a side strip extending along a first direction; and a plurality of teeth extending from one side of the side strip along a second direction substantially perpendicular to the first direction , the heights of the plurality of teeth in the second direction are substantially the same, and grooves are formed between the plurality of teeth, wherein the side strips extend outward for a predetermined length l from the two outermost teeth of the plurality of teeth along the first direction.

Preferably, the predetermined length l and the width D of the groove in the first direction satisfy the following relationship: D/2≤l≤D.

Preferably, the number of teeth is an integer multiple of 3 and not less than 6.

Preferably, the silicon steel sheet is used to laminate the iron core of the iron core linear motor, and the size of the silicon steel sheet is designed to be suitable for the iron core with a pole spacing between two magnets of the same polarity in the magnet array not less than 20mm and not greater than 50mm Linear Motor.

According to another aspect of the present invention, there is provided a silicon steel sheet, comprising: a side strip extending along a first direction; and a plurality of side strips extending from one side of the side strip along a second direction substantially perpendicular to the first direction. teeth forming slots therebetween, the plurality of teeth comprising: side teeth positioned at both ends in a first direction; and a plurality of middle teeth positioned between the two side teeth, wherein the middle teeth are positioned in a second direction The heights above are approximately the same and greater than the heights of the two side teeth in the second direction.

Preferably, the number of middle teeth is an integer multiple of 3.

Preferably, the height of the side teeth is 2/3 to 3/4 of the height of the middle teeth.

Preferably, the width d of the side groove in the first direction between the side tooth and its adjacent middle teeth and the width D of the middle groove in the first direction between two adjacent middle teeth satisfy the following relationship: D /2≤d≤D.

Preferably, the silicon steel sheet is used to laminate the iron core of the iron core linear motor, and the size of the silicon steel sheet is designed to be suitable for the iron core with a pole spacing between two magnets of the same polarity in the magnet array not less than 20mm and not greater than 50mm Linear Motor.

According to another aspect of the utility model, an iron core linear motor is provided, including: a stator part, on which a magnet array is arranged; and a mover part, which can move relative to the stator part, and an iron core is arranged on it, and The core has a plurality of slots, and a plurality of coils are respectively embedded in the plurality of slots. Wherein, the iron core is formed by laminating a plurality of silicon steel sheets according to the above-mentioned first or second aspect of the utility model.

Preferably, the pole spacing between two magnets of the same polarity in the magnet array is not less than 20 mm and not greater than 50 mm. Preferably, the multiple coils are connected in a 3-phase manner.

Preferably, each magnet in the magnet array is arranged obliquely relative to the moving direction of the mover part.

According to another aspect of the present invention, a linear motor platform is provided, including a first iron-core linear motor and a second iron-core linear motor, the stator part of the second iron-core linear motor is fixedly connected to the first iron-core linear motor The mover part, so as to move synchronously with the mover part of the first iron core linear motor. Wherein, both the first iron-core linear motor and the second iron-core linear motor are iron-core linear motors according to the utility model. The iron core of the first iron core linear motor has no side teeth. The side teeth of the iron core of the second iron core linear motor are partially cut off.

According to another aspect of the present invention, a kind of LED testing and sorting equipment is provided, including: the linear motor platform according to the present invention, wherein the moving direction of the mover part of the second iron-core linear motor is the same as that of the first iron-core linear motor The moving directions of the mover parts are perpendicular to each other; the blanking tube is fixedly connected to the mover part of the second iron core linear motor so as to move synchronously with the mover part of the second iron core linear motor; the blanking plate has multiple channels hole, the blanking plate is set to adapt to the range of movement of the blanking tube with the mover part of the second iron core linear motor, so that the blanking tube can move to the vicinity of each through hole; and a plurality of buckets are located at the bottom The lower part of the material plate is respectively connected to the through holes of the lower material plate.

By using the iron core formed by stacking silicon steel sheets according to the utility model, the new XY linear motor platform not only has relatively large load driving capacity, but also can realize high speed, high acceleration and high precision.

Description of drawings

Figure 1 is a schematic diagram of an iron core linear motor.

Figure 2 schematically shows the iron core and coils used in a conventional iron core linear motor.

Fig. 3 shows a schematic diagram of an iron core and a coil according to the first embodiment of the present invention.

Fig. 4 shows a silicon steel sheet according to the first embodiment of the present invention.

Fig. 5 shows a schematic diagram of an iron core and a coil according to a second embodiment of the present invention.

Fig. 6 shows a silicon steel sheet according to the second embodiment of the present invention.

Fig. 7 shows a schematic diagram of a linear motor platform according to a third embodiment of the present invention.

Fig. 8 shows a schematic diagram of an LED testing and sorting device according to a fourth embodiment of the present invention.

Detailed ways

The iron core linear motor, silicon steel sheet and linear motor platform according to the present invention will be described below with reference to the accompanying drawings.

Similar to the iron core linear motor shown in FIG. 1 , the iron core linear motor according to the present invention also includes a stator part 100 and a mover part 200 , and the mover part 200 can move relative to the stator part 100 . A magnet array 110 is disposed on the stator part 100 . An iron core 210 is disposed on the mover part 200 . The iron core 210 has a plurality of slots, and a plurality of coils are embedded in the slots, respectively. These coils can be connected in a 3-phase connection.

In order to reduce the cogging force, preferably each magnet in the magnet array is arranged obliquely relative to the moving direction of the mover part 200 .

As known by those skilled in the art, the pole spacing between two magnets in the magnet array of the iron core linear motor is an important dimension of the iron core linear motor, and the approximate size range of the teeth and slots of the iron core can be determined based on the pole spacing.

Through design calculations and prototype experiments, it is found that the pole spacing is preferably not less than 20 mm and not greater than 50 mm. When the 3-phase connection method is adopted, the pole spacing is between 20mm and 50mm, and the iron core has no side teeth or the side teeth are partially cut off, a better comprehensive effect can be achieved. At this time, the electromagnetic efficiency of the motor is very high, the installation space is simple, and it is convenient for production and assembly. The output performance of the motor is also relatively stable, and it also has relatively small cogging force.

The difference between the iron-core linear motor according to the utility model and the iron-core linear motor shown in FIG. 1 mainly lies in the different design of the iron core.

first embodiment

Fig. 3 shows a schematic diagram of an iron core and a coil 320 according to the first embodiment of the present invention.

Compared with the iron core shown in FIG. 2 , the side teeth (211 in FIG. 2 ) at the edge of the teeth of the iron core shown in FIG. 3 are completely removed, leaving only the teeth for winding the coil 320 thereon. Middle teeth 312 .

Through experiments and electromagnetic simulation calculations, it is found that the attraction and cogging force between the coil assembly and the magnet assembly can be effectively reduced by removing the side teeth, and the general reduction range is between 10% and 25%. If it is combined with other reduction The method of cogging force, such as magnet tilting, etc., can reduce the cogging force by more than 80%. At the same time, with the removal of the side teeth, the mass of the iron core is also reduced.

Preferably, the number of middle teeth 312 is an integer multiple of 3. Correspondingly, the number of coils 320 is the same as the number of middle teeth 312 , which is also an integer multiple of 3. These coils 320 can be connected in a 3-phase manner.

Generally, the iron core of the motor is made of laminated silicon steel sheets.

In the first embodiment, in the actual motor design and manufacturing process, it is difficult to achieve interlayer insulation between silicon steel sheets. When the number of teeth is 3, after the side teeth are completely cut off, due to the influence of silicon steel sheets and the The eddy current and other effects generated will affect the phase angle distribution of the motor. In severe cases, the motor will not work normally. Therefore, when the number of teeth is 3, we do not completely remove the side teeth, but we can use partial removal of the side teeth to improve the performance of the motor. , see the second embodiment for details. Through design calculations and actual experiments, we found that when the number of teeth is greater than or equal to 6 for a 3-phase motor, the operation of the motor will not be affected after the side teeth are completely removed. Therefore, preferably, the number of middle teeth 312 is not less than six.

Fig. 4 shows a silicon steel sheet 400 according to the first embodiment of the present invention. The silicon steel sheet 400 can be used for stacking to form the iron core according to the first embodiment of the present invention.

As shown in FIG. 4 , the silicon steel sheet 400 includes a side bar 410 extending along a first direction and a plurality of teeth 420 extending from one side of the side bar along a second direction substantially perpendicular to the first direction.

The heights of the plurality of teeth 420 in the second direction are substantially the same.

Slots 430 are formed between the plurality of teeth 420 .

As shown in the figure, there may be a plurality of holes 440 on the edge strip 410 of the silicon steel sheet 400, so as to stack and fix a plurality of silicon steel sheets 400 to form an iron core.

The portion 411 of the side bar 410 extends outwards from the two outermost teeth of the plurality of teeth 420 along the first direction by a predetermined length l. The predetermined length l and the width D of the groove 430 in the first direction satisfy the following relationship:

D/2≤l≤D.

The number of teeth 420 can be an integer multiple of 3, so the number of coils wound on the teeth of the iron core is also an integer multiple of 3, and the coils can be connected in a 3-phase manner.

In addition, as mentioned above, preferably the number of teeth 420 is not less than 6, that is, 6, 9, 12, ...

Moreover, the size of the silicon steel sheet according to the present utility model (especially the width W of the tooth 420 in the first direction and the width D of the groove 430 in the first direction) is designed to be suitable for different polar pitches of the same polarity in the magnet array. Iron-core linear motors less than 20mm and not greater than 50mm.

Using the iron core linear motor according to the first embodiment of the utility model, the cogging force can be reduced to 2% of the effective output force of the motor, or even lower. That is to say, for the effective output force of the motor of 1000N, the cogging force is about 20N, or even lower.

second embodiment

Fig. 5 shows a schematic diagram of an iron core and a coil 520 according to a second embodiment of the present invention.

Compared with the iron core shown in FIG. 2 , among the teeth of the iron core shown in FIG. 5 , the side teeth 511 at the edge are partially removed. Therefore, the height is lower compared to the centrally located teeth 512 for winding the coil 520 thereon. The height of the side teeth 511 may be about 3/4 to about 2/3 of the height of the middle teeth 512 .

Through experiments and simulation calculations, it is found that as long as part of the tooth 511 is cut off, the effect of reducing the attractive force and the cogging force between the coil assembly and the magnet assembly can be achieved. It is known through experiments and simulations that when about 1/4 to about 1/3 of the side teeth are cut off, sufficient attraction force and cogging force can be reduced. There is a limit to the further reduction in attractive and cogging forces that can be achieved by continuing to remove more teeth. In some cases, for example, when the number of middle teeth is 3 (the corresponding number of motor phases is 3), the existence of side teeth with appropriate height helps to optimize other factors. Thus, in some cases, it may be preferable not to remove the cog completely, but only about 1/4 to about 1/3 of the cog. The iron core according to the second embodiment of the utility model is designed for this situation.

Fig. 6 shows a silicon steel sheet 600 according to the second embodiment of the present invention. The silicon steel sheets 600 can be used for stacking to form the iron core according to the second embodiment of the present invention.

As shown in FIG. 6, the silicon steel sheet 600 includes a side bar 620 extending along a first direction and a plurality of teeth (620, 625) extending from one side of the side bar along a second direction substantially perpendicular to the first direction. Slots (middle slot 630 and side slot 635) are formed between teeth (620, 625),

As shown in the figure, the side bar 610 of the silicon steel sheet 600 may also have a plurality of holes 640 for stacking and fixing a plurality of silicon steel sheets 600 to form an iron core.

The plurality of teeth ( 620 , 625 ) includes side teeth 625 located at both ends in the first direction and a plurality of middle teeth 620 located between the two side teeth 625 . Preferably, the number of middle teeth 620 is an integer multiple of 3, that is, 3, 6, 9, 12, ...

The heights H of the plurality of middle teeth 620 in the second direction are substantially the same, and are greater than the height h of the two side teeth 625 in the second direction.

The height h of the side teeth 625 is 2/3 to 3/4 of the height H of the middle teeth 620 . That is, the side teeth 625 are cut off by Δh relative to the middle teeth 620, and Δh is about 1/4 to 1/3 of H.

The width d of the side groove 635 in the first direction between the side tooth 625 and its adjacent middle tooth 620 and the width D of the middle groove 630 between two adjacent middle teeth 620 in the first direction satisfy the following relationship :

D/2≤d≤D.

In addition, the size of the silicon steel sheet according to the present invention (especially the width W of the teeth 620 in the first direction and the width D of the groove 630 in the first direction) is designed to be suitable for different polar pitches of the same polarity in the magnet array. Iron-core linear motors less than 20mm and not greater than 50mm.

Using the ferromagnetic linear motor according to the second embodiment of the present invention, the cogging force drops to 2% of the effective output force of the motor, or even lower. That is to say, for the effective output force of the motor of 1000N, the cogging force is about 20N, or even lower.

third embodiment

Fig. 7 shows a schematic diagram of a linear motor platform according to a third embodiment of the present invention.

The linear motor platform shown in FIG. 7 includes an X-direction (first) iron-core linear motor at the lower part and a Y-direction (second) iron-core linear motor at the upper part.

The base plate 710 and other components fixed on the base plate 710, such as the X guide rail, the X magnet assembly 720, the X limit switch, the X linear displacement sensor, etc., together constitute the X stator part of the X-direction iron core linear motor. Although the figure schematically shows guide rails, limit switches, linear displacement sensors, etc., in order to avoid obscuring the essence of the utility model, no detailed description is given here.

An X iron core 740 is installed on the X mover part 730 of the X direction iron core linear motor.

The Y stator part of the iron core linear motor in the Y direction is fixedly connected to the X mover part 730 , and can even be integrated with the X mover part 730 so as to move synchronously with the X mover part 730 .

Similarly, a Y magnet assembly 750 may be provided on the Y stator part of the Y-direction iron-core linear motor. In addition, a Y guide rail, an X limit switch, and a Y linear displacement sensor may also be provided, which will not be described in detail here.

A Y iron core 770 is installed on the Y mover part 760 of the Y direction iron core linear motor.

Both the X-direction iron-core linear motor and the Y-direction iron-core linear motor can be the iron-core linear motor according to the above-mentioned first or second embodiment of the utility model.

Since the mass of the X mover part is large and requires a large driving force, six or more teeth (intermediate teeth) for winding coils can be provided for the X iron core 740 of the X direction iron core linear motor to facilitate winding Six or more coils. In this case, you can choose to use the iron core linear motor according to the first embodiment of the present utility model, and its iron core may not have side teeth. Of course, according to actual design requirements, the X-direction iron-core linear motor can also adopt the iron-core linear motor according to the second embodiment of the present invention.

The Y-direction iron-core linear motor is mounted on the mover part 730 of the X-direction iron-core linear motor. For better acceleration performance, a smaller mass of the stator part and the mover part is desired. Therefore, three teeth for winding coils may be provided for the Y iron core 770 of the Y direction iron core linear motor so as to wind three coils connected in a three-phase manner. In this case, it is possible to choose to use the iron core linear motor according to the second embodiment of the utility model, whose iron core has three middle teeth and two side teeth, and the side teeth are partially cut off, so that the height of the side teeth is low in the middle tooth. The height of the side teeth can be 3/4 to 2/3 of the height of the middle teeth. Of course, according to actual design requirements, the Y-direction iron-core linear motor may also have more intermediate teeth. At the same time, the Y-direction iron-core linear motor can also adopt the iron-core linear motor according to the first embodiment of the utility model.

In the linear motor platform shown in FIG. 7 , the moving directions of the first (X direction) and second (Y direction) iron core linear motors are perpendicular to each other. However, those skilled in the art should understand that the movement directions of the two iron-core linear motors can also form a predetermined angle other than 90°. Even, they can move in the same direction, such as a telescoping device similar to a crane's multi-segment telescopic boom.

In addition, both the magnet assembly 720 of the X-direction iron-core linear motor and the magnet assembly 750 of the Y-direction iron-core linear motor can use inclined magnets to further reduce the cogging force.

As a verification, the inventor adopts an oblique magnet to the X-direction iron core linear motor, and adopts an iron core with a toothless structure (the first embodiment); also adopts an oblique magnet to the Y-direction iron core linear motor, and cuts off the iron core. The method of partial side teeth (second embodiment) is designed. The XY linear platform designed in this way not only effectively reduces the cogging force in the X direction and the Y direction, but also greatly reduces the mass of the motor mover in the X and Y directions. The actual performance parameters of the XY linear motor platform prototype using the above design method are as follows:

project x Y maximum acceleration 6G 10G Maximum speed 3m/s 3m/s journey 293 137 Repeatability 5μm 5μm absolute precision 10μm 10μm resolution 1μm 1μm dynamic response time 10ms 10ms

Fourth embodiment

As mentioned above, the XY linear motor platform according to the third embodiment of the present invention has the effect of small cogging force, high acceleration, and large output force, and is especially suitable for some applications requiring high-speed and precise operation. As an example, a kind of LED (Light Emitting Diode) testing and sorting equipment adopting the XY linear motor platform of the present invention is described here.

Existing LED testing and sorting equipment mainly adopts an XY platform structure with a servo motor and a belt to drag the LED feeding tube to move, so as to realize LED sorting. The classification speed and accuracy of this method are limited (the movement speed of the belt is difficult to break through 1.5m/s, and the electromagnetic mechanical response of the servo motor is relatively lagging, and it is difficult to achieve a fast dynamic response), and it is difficult to meet the current requirements for faster LED classification and classification accuracy. Applications with higher requirements (LEDs are getting smaller and smaller, and classification accuracy requirements are getting higher and higher).

Fig. 8 shows a schematic diagram of an LED testing and sorting device according to a fourth embodiment of the present invention.

The LED testing and sorting equipment shown in Fig. 8 is realized based on the XY linear motor platform shown in Fig. 7 . Details about the motor will not be described in detail here.

The LED testing and sorting device shown in FIG. 8 also includes a blanking tube 880, a blanking plate 890 and a plurality of barrels (not shown in the figure).

The feeding tube 880 is fixedly connected to the Y mover part 760 of the Y-direction iron core linear motor so as to move synchronously with the Y mover part 760 of the second iron core linear motor.

The blanking plate 890 may be disposed on the bottom plate 710 . The blanking plate 890 has a plurality of through holes, which are set to adapt to the range of movement of the blanking tube 880 along with the mover part 760 of the iron core linear motor in the Y direction, so that the blanking tube 880 can move to the vicinity of each through hole. FIG. 8 shows that the blanking plate 890 is under the X mover part of the X direction iron core linear motor. The Y mover part 760 can drive the blanking pipe 880 to move above the through hole of the blanking plate 890 .

A plurality of barrels (not shown) are arranged under the blanking plate 890 , which are respectively connected to each through hole of the blanking plate 890 .

In operation, under the cooperation of the X mover part and the Y mover part, the blanking pipe 880 is driven to the top of the designated through hole of the blanking plate 890 . The LED enters the corresponding through hole of the blanking plate 890 from the blanking pipe 880, and then enters the corresponding bucket through the through hole, thereby completing the classification.

Since how to classify LEDs (classification standards and methods) is not the core of the present invention, it will not be described in detail here. The focus of the fourth embodiment of the utility model is how to quickly and accurately put the sorted LEDs into the correct bucket.

An example of using the XY linear motor platform according to the present invention for LED testing and sorting equipment has been described above. However, those skilled in the art should understand that the XY linear motor platform according to the utility model can not only be used in LED testing and sorting equipment, but also can be developed into a general high-speed, high-acceleration, high-precision platform for various Where there are high demands on speed, acceleration and precision.

In addition, those skilled in the art should understand that the utility model is not limited to the specific embodiments described here, but can also be implemented in other ways. The protection scope of the utility model is defined by the appended claims. According to the content disclosed in the utility model, some similarities and alternatives that can be obviously thought of by those skilled in the art should all fall into the scope of protection of the utility model.

Claims (14)

1. a silicon steel sheet, comprising:

The edge strip extending along first direction; And

Multiple teeth that a side along substantially vertical with first direction second direction from described edge strip is extended, the height of described multiple teeth in described second direction is roughly the same, between described multiple teeth, forms groove,

It is characterized in that,

Described edge strip is along described first direction outermost two teeth directional extension predetermined length l from described multiple teeth.

2. silicon steel sheet according to claim 1, is characterized in that, described predetermined length l and the width D of described groove on described first direction meet following relation:

D/2≤l≤D。

3. silicon steel sheet according to claim 1, is characterized in that, the integral multiple that the number of described tooth is 3, and be not less than 6.

4. according to the silicon steel sheet described in any one in claims 1 to 3, it is characterized in that, described silicon steel sheet is for the iron core of stacked formation iron core linear electric motors, described silicon steel sheet be designed and sized to the iron core linear electric motors that die opening between two magnet that are applicable to same polarity in magnet array is not less than 20mm and is not more than 50mm.

5. a silicon steel sheet, comprising:

The edge strip extending along first direction; And

Multiple teeth that a side along substantially vertical with first direction second direction from described edge strip is extended, form groove between described multiple teeth,

Described multiple tooth comprises:

Be positioned at the heel teeth of two ends on first direction; With

Multiple center teeth between described two heel teeths,

It is characterized in that,

The height of described center teeth in described second direction is roughly the same, and is greater than the height of described two heel teeths in described second direction.

6. silicon steel sheet according to claim 5, is characterized in that, the integral multiple that the number of described center teeth is 3.

7. silicon steel sheet according to claim 5, is characterized in that, the height of described heel teeth be described center teeth height 2/3 to 3/4.

8. silicon steel sheet according to claim 5, it is characterized in that, the width D of the intermediate channel between the width d center teeth adjacent with two of the limit groove between described heel teeth and the center teeth that is adjacent on described first direction on described first direction meets following relation:

D/2≤d≤D。

9. according to the silicon steel sheet described in any one in claim 5 to 8, it is characterized in that, described silicon steel sheet is for the iron core of stacked formation iron core linear electric motors, described silicon steel sheet be designed and sized to the iron core linear electric motors that die opening between two magnet that are applicable to same polarity in magnet array is not less than 20mm and is not more than 50mm.

10. iron core linear electric motors, comprising:

Stationary part, is provided with magnet array on it; And

Mover part, can, with respect to described stationary part motion, be provided with iron core on it, described iron core has multiple grooves, and multiple coils are embedded in respectively in described multiple groove,

It is characterized in that,

Described iron core is to be laminated according to the silicon steel sheet described in any one in claim 1-9 by multiple.

11. iron core linear electric motors according to claim 10, is characterized in that,

Die opening in described magnet array between two of same polarity magnet is not less than 20mm, and is not more than 50mm;

Described multiple coil adopts 3 modes that are connected.

12. iron core linear electric motors according to claim 10, is characterized in that, each magnet in described magnet array is obliquely installed with respect to the direction of motion of described mover part.

13. 1 kinds of linear electric motors platforms, comprise the first iron core linear electric motors and the second iron core linear electric motors, the stationary part of described the second iron core linear electric motors is fixedly attached to the mover part of described the first iron core linear electric motors, so that the mover Partial synchronization motion with described the first iron core linear electric motors, it is characterized in that

Described the first iron core linear electric motors and described the second iron core linear electric motors are all according to the iron core linear electric motors described in any one in claim 10-12,

The iron core of described the first iron core linear electric motors is by being laminated according to the silicon steel sheet described in any one in claim 1-4,

The iron core of described the second iron core linear electric motors is by being laminated according to the silicon steel sheet described in any one in claim 5-9.

14. 1 kinds of LED testing classification equipment, comprising:

Linear electric motors platform according to claim 13, the direction of motion of the mover part of wherein said the second iron core linear electric motors is mutually vertical with the direction of motion of the mover part of described the first iron core linear electric motors;

Tremie pipe, is fixedly attached to the mover part of described the second iron core linear electric motors, to move with the mover Partial synchronization of described the second iron core linear electric motors;

Blanking plate, has multiple through holes, and described blanking plate is set to adapt with the range of movement of the mover part of described the second iron core linear electric motors with described tremie pipe, so that described tremie pipe can be moved near each through hole; And

Multiple charging baskets, are positioned at described blanking plate below, are communicated to respectively the through hole of described blanking plate.