阅读说明：本技术 磁浮电机及其控制方法 (Magnetic suspension motor and control method thereof ) 是由 丛国栋 于 2019-04-17 设计创作，主要内容包括：本发明提供了一种磁浮电机及其控制方法,磁钢阵列模块上具有至少两个线圈模块,每个所述线圈模块均包括至少6个呈矩阵分布的发力体,控制模块实时识别两个线圈模块所处的工况并根据所述线圈模块所处的工况控制其发力体的通电和断电并切换所述线圈模块的工作模式,能够在有限的面积下使至少6个呈矩阵分布的发力体同时使用,在需要时增加所述线圈模块运动的加速度,并且不需要将磁钢阵列模块的尺寸做的足够大。(The invention provides a magnetic suspension motor and a control method thereof, wherein a magnetic steel array module is provided with at least two coil modules, each coil module comprises at least 6 force generators distributed in a matrix, the control module identifies the working condition of the two coil modules in real time, controls the power on and off of the force generators according to the working condition of the coil modules and switches the working mode of the coil modules, so that the at least 6 force generators distributed in the matrix can be used at the same time in a limited area, the acceleration of the movement of the coil modules is increased when needed, and the size of the magnetic steel array module does not need to be made large enough.)

1. A magnetic levitation motor, comprising:

the magnetic steel array module is used for generating a magnetic field;

the coil modules are positioned on the magnetic steel array module and can move in a plane parallel to the magnetic steel array module, and each coil module comprises at least 6 force generators distributed in a matrix;

and the control module is connected with each coil module and is used for controlling the electrification and the outage of each power generating body in the coil module and switching the working mode of the coil module.

2. A magnetic levitation motor as recited in claim 1, wherein the force generating body in the coil module comprises a plurality of coils arranged in parallel along a same direction, wherein the coil arrangement direction of two adjacent force generating bodies is perpendicular.

3. A method of controlling a magnetic levitation motor as recited in claim 1 or 2, wherein the total number of forcers per row in the coil module is less than the total number of forcers per column.

4. A magnetic levitation motor as recited in claim 2, wherein the coil module has K force generators therein, K being an even number greater than or equal to 6;

when K is a multiple of 3, the distance D between the centers of the two force generators in the coil arrangement direction in the coil module, which are the same as each other in the coil arrangement direction, in the coil arrangement direction satisfies the following formula:

when K is not a multiple of 3, the distance D between the centers of the two force generators in the coil arrangement direction in the coil module, which are the same as the coil arrangement direction, in the coil arrangement direction thereof satisfies the following formula:

wherein n is any positive integer, and τ is the magnetic pole pitch of the magnetic steel array module.

5. A magnetic levitation motor as recited in claim 1, wherein each of said coil modules comprises a support base, said force generator being disposed within said support base.

6. The magnetic levitation motor of claim 1, wherein a sum of width dimensions of all the coil modules on the magnetic steel array module in a row direction is smaller than a width dimension of the magnetic steel array module in the row direction; the width dimension of one coil module in the column direction is smaller than the width dimension of the magnetic steel array module in the column direction, and the sum of the width dimensions of the two coil modules in the column direction is larger than the width dimension of the magnetic steel array module in the column direction.

7. A method of controlling a magnetic levitation motor as recited in any one of claims 1-6, comprising:

the control module identifies the working condition of the coil module in real time;

the control module controls the power-on and power-off of the force generating body of the coil module according to the working condition of the coil module and switches the working mode of the coil module.

8. The method of claim 7, wherein the operation modes of the coil module include a less-coil operation mode and a full-coil operation mode, in the less-coil operation mode, the control module controls at least one of the power generators of the coil module to be powered off and the power generators of the remaining rows to be powered on, and in the full-coil operation mode, the control module controls all the power generators of the coil module to be powered on.

9. The method of claim 8, wherein the coil module is in a measurement alignment mode when the coil module moves within the magnetic steel array module, the control module controls the coil module to be in a full coil mode, and the coil module is in a position switching mode when the coil module moves to switch positions, the control module controls a power generator suspended outside the magnetic steel array module to be powered off and controls the coil module to be in a less coil mode.

10. A method for controlling a magnetic levitation motor as recited in claim 8 or 9, wherein in the less-coil operation mode, the control module controls the same number and same position of the force generators to be powered off each time for the same coil module.

Technical Field

The invention relates to the technical field of semiconductor preparation, in particular to a magnetic suspension motor and a control method thereof.

Background

In a workpiece stage and a mask stage of a lithography machine, a long-stroke linear motor is usually combined with a short-stroke voice coil motor, and an air bearing is selected to realize high-speed and high-precision positioning. However, in this structure, in order to obtain multiple degrees of freedom of movement, multiple linear motors are often required to be stacked. The structural scheme not only increases the complexity of the whole system and reduces the mode, but also increases the load of the bottom layer linear motor, so that the positioning precision, the control bandwidth and the movement speed of the movement table are greatly reduced. In addition, when the moving stroke needs to be increased, the manufacturing cost of the air floatation linear guide rail is not only increased geometrically, but also is more difficult, and the manufacturing cost becomes a development bottleneck of manufacturing large-size wafers.

In order to solve the problems, a magnetic suspension motor, which is a motor with a novel structure, is provided. The electromagnetic force generating device is based on the Lorentz force principle, directly applies the generated electromagnetic force to a workpiece table, and can provide multi-axis motion simultaneously. The magnetic suspension motor generally comprises two parts, namely a magnetic steel array module and a coil unit module, and magnetic steel array units in the magnetic steel array module are arranged alternately, so that the magnetic suspension motor is very convenient to expand and effectively solves the technical bottleneck of large-stroke design. And the constraint on the motion surface type is reduced through the magnetic levitation technology, the working process is free of contact abrasion, and the device is very suitable for the requirements of large stroke, vacuum, ultra-clean and ultra-precise positioning.

The coil unit module of current magnetic levitation motor has 4 to send out the acceleration that the power body provided the removal usually, and total acceleration is less, just need increase the quantity of sending out the power body in order to increase total acceleration, but because magnet steel array module width size can't accomplish very greatly in the direction of being listed as, be limited to the restraint of size and overall arrangement, the area of current magnet steel array module can't satisfy 6 and the more than sending out the power body and use simultaneously.

Disclosure of Invention

The invention aims to provide a magnetic suspension motor and a control method thereof, which can meet the requirement that 6 or more force generators are used simultaneously under the condition that the width size of a magnetic steel array module in the row direction is limited.

In order to achieve the above object, the present invention provides a magnetic levitation motor, comprising:

the magnetic steel array module is used for generating a magnetic field;

the coil modules are positioned on the magnetic steel array module and can move in a plane parallel to the magnetic steel array module, and each coil module comprises at least 6 force generators distributed in a matrix;

and the control module is connected with each coil module and is used for controlling the electrification and the outage of each power generating body in the coil module and switching the working mode of the coil module.

Optionally, the force generating body in the coil module includes a plurality of coils arranged in parallel along the same direction, and the coil arrangement directions of two adjacent force generating bodies are perpendicular.

Optionally, the total number of the hair-force bodies in each row in the coil module is less than the total number of the hair-force bodies in each column.

Optionally, the coil module has K force generators, where K is an even number greater than or equal to 6;

when K is a multiple of 3, the distance D between the centers of the two force generators in the coil arrangement direction in the coil module, which are the same as each other in the coil arrangement direction, in the coil arrangement direction satisfies the following formula:

when K is not a multiple of 3, the distance D between the centers of the two force generators in the coil arrangement direction in the coil module, which are the same as the coil arrangement direction, in the coil arrangement direction thereof satisfies the following formula:

wherein n is any positive integer, and τ is the magnetic pole pitch of the magnetic steel array module.

Optionally, each coil module includes a support seat, and the force generator is disposed in the support seat.

Optionally, the sum of the width dimensions of the coil modules on the magnetic steel array module in the row direction is smaller than the width dimension of the magnetic steel array module in the row direction; the width dimension of one coil module in the column direction is smaller than the width dimension of the magnetic steel array module in the column direction, and the sum of the width dimensions of the two coil modules in the column direction is larger than the width dimension of the magnetic steel array module in the column direction.

The invention also provides a control method of the magnetic suspension motor, which comprises the following steps:

the control module identifies the working condition of the coil module in real time;

the control module controls the power-on and power-off of the force generating body of the coil module according to the working condition of the coil module and switches the working mode of the coil module.

Optionally, the working modes of the coil module include a few-coil working mode and a full-coil working mode, in the few-coil working mode, the control module controls at least one line of the force generating bodies of the coil module to be powered off, and the force generating bodies in the remaining lines to be powered on, and in the full-coil working mode, the control module controls all the force generating bodies of the coil module to be powered on.

Optionally, when the coil module is in the magnetic steel array module moves, the coil module is in a measurement alignment working condition, the control module controls the coil module to be in a full-coil working mode, and when the coil module moves to switch positions, the coil module is in a position switching working condition, and the control module controls a force generating body suspended outside the magnetic steel array module to be powered off and controls the coil module to be in a less-coil working mode.

Optionally, in the less-coil operating mode, for the same coil module, the control module controls the power-off of the force generators in the same number and the same position each time.

In the magnetic suspension motor and the control method thereof provided by the invention, the magnetic steel array module is provided with at least two coil modules, each coil module comprises at least 6 power generating bodies distributed in a matrix, the control module identifies the working condition of the two coil modules in real time, controls the power on and off of the power generating bodies according to the working condition of the coil modules and switches the working mode of the coil modules, so that the at least 6 power generating bodies distributed in the matrix can be used at the same time in a limited area, the acceleration of the movement of the coil modules is increased when needed, and the size of the magnetic steel array module does not need to be made large enough.

Drawings

Fig. 1 is a schematic cross-sectional view of a coil module according to an embodiment of the present invention;

fig. 2 is a top view of a coil module provided in an embodiment of the present invention;

fig. 3 is a schematic plan view of a magnetic levitation motor according to an embodiment of the present invention;

fig. 4-8 are diagrams illustrating control steps of a magnetic levitation motor according to an embodiment of the present invention;

wherein the reference numerals are:

1-a magnetic steel array module; 2-a coil module; 21 a-a first coil module; 21 b-a second coil module; 211-hair force body; 212-support seat.

Detailed Description

The following describes in more detail embodiments of the present invention with reference to the schematic drawings. Advantages and features of the present invention will become apparent from the following description and claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.

For convenience of description, an XYZ three-dimensional coordinate system is established herein with a direction X (column direction) downward parallel to the paper, a direction Y (row direction) leftward on the paper, and a direction Z outward perpendicular to the paper. As shown in fig. 1-3, the present embodiment provides a magnetic levitation motor, which includes a magnetic steel array module 1, a control module, and at least two coil modules 2, where the magnetic steel array module 1 is configured to generate a magnetic field, at least two of the coil modules 2 are suspended above the magnetic steel array module 1, each of the coil modules 2 includes a support base 212 and at least 6 force generators 211 located in the support base 212, and each of the force generators 211 in the coil module 2 includes a plurality of coils arranged in parallel along a same direction, where the coil arrangement directions of two adjacent force generators 211 are perpendicular, and when the coils of the force generators 211 are energized, the coil modules 2 can move in a plane parallel to the magnetic steel array module 1. The control module is connected to each coil module 2, and is configured to control power on and power off of each force generating body 211 in the coil module 2 and switch a working mode of the coil module 2.

Specifically, as shown in fig. 2 and 3, in this embodiment, the magnetic steel array module 1 has two coil modules 2, each of the coil modules 2 has 6 force generators 211(XZ1, XZ2, XZ3, YZ1, YZ2, YZ3), each of the force generators 211 includes 3 coils arranged in parallel in the X direction or the Y direction (the coils in XZ1, XZ2, XZ3 are arranged in parallel in the X direction, and the coils in YZ1, YZ2, YZ3 are arranged in parallel in the Y direction), and the coil arrangement directions of two adjacent force generators 211 are different, that is, the force generators 211 with different coil arrangement directions are always arranged at intervals regardless of the X direction or the Y direction.

It can be understood that, although the Z-direction force generated by each coil in each of the force generating bodies 211 can generate the required levitation force to levitate the coil module 2 on the magnetic steel array module 1, due to the existence of the rotating arm to the center of mass of the force generating body 211, the resultant torque of the force generating body 211 is not zero, and an accompanying torque around the X direction or the Y direction, called pitch torque, cannot be avoided, the coils generating the X-direction force and the Z-direction force have a pitch torque around the Y direction, and the coils generating the Y-direction force and the Z-direction force have a pitch torque around the X direction, so that the pitch torques exist as interferences and must be eliminated. As shown in fig. 2, in this embodiment, 6 power generators 211 are distributed in 3 rows and 2 columns, where let the magnetic pole pitch of the magnetic steel array module 1 be τ, the distance between the center of XZ2 and the center of XZ1 in the X direction be Δ X1, the distance between the center of XZ1 and the center of XZ3 in the X direction be Δ X2, Δ X1 ═ Δ X2 ═ 5+1/3 ×, the distance between the center of YZ1 and the center of YZ3 in the Y direction be Δ Y1, the distance between the center of YZ2 and the center of YZ1 in the Y direction be Δ Y2, Δ Y1 ═ 4+1/3 τ, and Δ Y2 ═ 1/3, then the pitch torques generated by the 6 power generators 211 are:

wherein the content of the first and second substances,

Ty_XZ1、Ty_XZ2、Ty_XZ3、Tx_YZ1、Tx_YZ2、Tx_YZ3the pitch torques, Fx, generated by XZ1, XZ2, XZ3, YZ1, YZ2 and YZ3_XZ1、Fx_XZ2、Fx_XZ3The X-direction force, Fy, generated by XZ1, XZ2 and XZ3 respectively_YZ1、Fy_YZ2、Fy_YZ3Y-direction forces, Fz, generated by YZ1, YZ2, YZ3, respectively_XZ1、Fz_XZ2、Fz_XZ3The Z-direction force, Fz, generated by XZ1, XZ2 and XZ3 respectively_YZ1、Fz_YZ2、Fz_YZ3The Z-direction forces generated by YZ1, YZ2, YZ3, respectively.

When all of the Δ X1, Δ X2, Δ Y1 and Δ Y2 satisfy the formula

Wherein D is Δ X1, Δ X2, Δ Y1 or Δ Y2, and n is any positive integer, then equation (1) is equivalent to:

tx and Ty are respectively distance torques in the X direction and the Y direction, and the magnetic suspension motor is in a state of uniform output at the moment, so that structural compensation of the distance torques is completed. That is, in the present embodiment, the distance D between the centers of the two power generating bodies 211 in the coil arrangement direction in the coil module 2 is set to be the same as each other in the coil arrangement directionThe distance torque of the magnetic suspension motor is compensated, so that the magnetic suspension motor is in a state of uniform output.

As can be obtained from the above manner, when the number K of the force generators 211 in the coil module 2 is a multiple of 3, the distance D between the centers of the two force generators 211 in the coil arrangement direction in the coil module 2 is set to be equal to each other in the coil arrangement directionWhen the number K of the force generators 211 in the coil module 2 is not a multiple of 3 (for example, an even number greater than or equal to 6, K-8, K-10, or the like), the distance D between the centers of two force generators in the same coil arrangement direction in the coil arrangement direction is set to be equal to or smaller than 3

It is understood that, the distance D between the centers of each two of the power generating bodies 211 in the coil arrangement direction in the coil module 2 may be equal or different as long as the distance D satisfies the requirementOrAnd (4) finishing.

Further, as shown in fig. 3, in this embodiment, the sum of the width dimensions of all the coil modules 2 in the Y direction of the magnetic steel array module 1 is smaller than the width dimension of the magnetic steel array module 1 in the Y direction, one of the width dimensions of the coil modules 2 in the X direction is smaller than the width dimension of the magnetic steel array module 1 in the X direction, so that the coil modules 2 can move and adjust positions in the X direction and the Y direction, and the sum of the width dimensions of the two coil modules 2 in the X direction is larger than the width dimension of the magnetic steel array module 1 in the X direction, so that the size of the magnetic steel array module 1 in the X direction can be made smaller, and the manufacturing cost of the magnetic steel array module 1 is reduced. Because the size of the magnetic steel array module 1 in the X direction is limited, when the two coil modules 2 move, the space of the magnetic steel array module 1 cannot be well utilized, and particularly, the exchange of the positions of the two coil modules 2 is difficult to realize. When two coil modules 2 are located in the magnetic steel array module 1 and only move within a fixed range (position exchange is not involved), the control module controls each force generating body in the coil modules 2 to be electrified and switches the working mode of the coil modules 2 to a full-coil working mode (6 force generating bodies work simultaneously), and when the two coil modules 2 need to switch positions, the control module controls at least one line of force generating bodies in the coil modules 2 to be powered off and switches the working mode of the coil modules 2 to at least the coil working mode (4 force generating bodies work simultaneously).

Based on this, the present embodiment further provides a control method of a magnetic levitation motor, including:

step S1: the control module identifies the working condition of the coil module in real time;

step S2: the control module controls the power-on and power-off of the force generating body of the coil module according to the working condition of the coil module and switches the working mode of the coil module.

Specifically, as shown in fig. 4 to 8, the magnetic levitation motor is used in a stage of a lithography machine to carry and move a substrate to be exposed.

As shown in fig. 4, the magnetic steel array module 1 has two stations, which are an exposure station and a measurement station, respectively, an exposure module and a measurement module are respectively disposed above the exposure station and the measurement station, the coil module is used for bearing a substrate, and when the coil module bears the substrate and is located at the exposure station or the measurement station, the exposure module and the measurement module perform exposure or measurement on the substrate. In this embodiment, the magnetic steel array module 1 is respectively provided with two coil modules 2, namely a first coil module 21a and a second coil module 21b, in an initial state, the two first coil modules 21a and the second coil modules 21b are respectively located at an exposure station and a measurement station, at this time, a substrate carried by the first coil module 21a is performing work flows such as coaxial alignment, silicon wafer exposure and the like, a substrate carried by the second coil module 21b is performing work flows such as workpiece stage leveling, workpiece stage alignment, silicon wafer surface shape measurement, silicon wafer alignment and the like, so as to prepare for exposure, at this time, the two first coil modules 21a and the second coil module 21b are both in a measurement alignment condition, and both the two first coil modules 21a and the second coil modules 21b need high acceleration to rapidly realize alignment work, therefore, at this time, the control module controls the first coil module 21a and the second coil module 21b to be in the full-coil operating mode, that is, the 6 generators of the first coil module 21a and the second coil module 21b are all energized to provide high acceleration, so as to improve the speed of measurement and exposure, and improve the yield.

Further, after the substrates carried by the first coil module 21a and the second coil module 21b are measured and exposed, the substrate on the first coil module 21a is exposed, and needs to be moved to a lower station to be removed and moved to an upper station to be removed, and after the removal of the substrate, the substrate on the second coil module 21b is moved to the measuring station, and after the removal of the substrate, the substrate on the second coil module 21b is measured and needs to be moved to an exposure station to perform exposure. That is, the first coil module 21a and the second coil module 21b need to exchange positions. As shown in fig. 5, due to the size limitation of the magnetic steel array module 1 in the X direction, when the first coil module 21a and the second coil module 21b exchange positions, the first power generator (XZ3 and YZ1) of the first coil module 21a and the last power generator (XZ3 and YZ1) of the second coil module 21b hang out of the magnetic steel array module 1, and the first coil module 21a and the second coil module 21b are both in a position switching condition, when the control module controls the first coil module 21a and the second coil module 21b to be in a low coil operation mode, that is, 4 power generators of the first coil module 21a and the second coil module 21b are powered before the power generators (XZ3 and YZ1) hang out of the magnetic steel array module 1, and at this time, although the acceleration is reduced for the exposure process, the alignment work of the exposure station and the measurement station needs thousands of frequent acceleration and deceleration, so the alignment work of the exposure station and the measurement station is an important factor influencing the yield, the influence of the acceleration reduction on the yield is small when the position is switched, and the control method of the magnetic suspension motor still greatly improves the yield in the whole view.

It can be understood that, in this embodiment, since each of the first coil module 21a and the second coil module 21b has only 6 force generators and is relatively small in size, only one line of force generators is suspended outside the magnetic steel array module 1, and when there are more than 6 force generators in the first coil module 21a and the second coil module 21b, so that the size of the coil module in the X direction is large, multiple lines of force generators may be suspended outside the magnetic steel array module 1, which is not illustrated herein.

Further, as shown in fig. 6, when the first coil module 21a moves to the film deposition station in the low-coil mode to remove the exposed substrate, the second coil module 21b may move to the exposure station directly in the low-coil mode to wait for the first coil module 21a to be in place. Next, as shown in fig. 7, the first coil module 21a moves to the chip loading station for chip loading under the less-coil working mode, and then moves to the measurement station, at this time, the first coil module 21a and the second coil module 21b complete position exchange, end the position switching working condition, start measurement of the alignment station, and the control module controls the first coil module 21a and the second coil module 21b to switch into the full-coil working mode. As shown in fig. 8, after the substrate of the first coil module 21a and the second coil module 21b is measured and exposed, the first coil module 21a and the second coil module 21b exchange positions again, and the control module switches the coil-less operation mode before the power generating bodies (XZ3 and YZ1) hang out of the magnetic steel array module 1. Through switching full coil mode and few coil mode can make 6 at least be matrix distribution's power of exerting oneself bodies and use simultaneously under the limited condition of magnet steel array module 1 size, increase when needs the acceleration of coil module motion to need not to do the size of magnet steel array module big enough, reduced manufacturing cost.

It can be understood that, in the few-coil operating mode, for the same coil module, the control module controls the power generators in the same number and the same position to be powered off each time, that is, the number and the positions of the power generators powered off and powered on in the few-coil operating mode of each coil module are fixed, and the control is simpler.

In summary, in the magnetic levitation motor and the control method thereof provided by the embodiments of the present invention, the magnetic steel array module is provided with at least two coil modules, each of the coil modules includes at least 6 force generators distributed in a matrix, the control module identifies the working conditions of the two coil modules in real time, controls the energization and the de-energization of the force generators according to the working conditions of the coil modules, and switches the working modes of the coil modules, so that at least 6 force generators distributed in a matrix can be used simultaneously in a limited area, the acceleration of the movement of the coil modules is increased when necessary, and the size of the magnetic steel array module does not need to be large enough.

The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any way. It will be understood by those skilled in the art that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.