High-precision linear motor

Abstract

The utility model discloses a high-precision linear motor, which comprises a shell, a driving part and a transmission part, wherein the driving part and the transmission part are arranged in the shell. The driving part comprises a motor rotor and a motor stator, a groove is formed in the motor stator, and two parallel and opposite magnetic tracks are arranged in the groove. The transmission part comprises a connecting piece in sliding connection with the shell. And the connecting piece is fixedly connected with the motor rotor, so that a thrust coil of the motor rotor is positioned between the two magnetic tracks in the groove and is not connected with the motor stator. According to the utility model, the motor stator and the motor rotor in the driving part are in non-contact connection, so that non-contact driving can be realized through interaction of magnetic fields in the working process of the motor, mechanical friction is greatly reduced, energy consumption in the working process of the motor is reduced, motion smoothness and positioning accuracy of the motor are improved, and the service life of the motor is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of motors, and in particular relates to a high-precision linear motor. Background Art

[0002] Traditional linear motors generally use ball screws or sliding guides to achieve linear motion. Although these mechanisms are mature, they have problems such as mechanical wear, large friction resistance, and limited positioning accuracy, which affect the long-term stability and operating efficiency of the system. With the development of science and technology, higher requirements are placed on the accuracy, response speed and reliability of linear motion components. An innovative drive solution is urgently needed to overcome the limitations of existing technologies. Utility Model Content

[0003] The utility model is dedicated to solving the deficiencies of the prior art and aims to improve the precision and life of the moving parts of the linear motor and reduce the energy consumption of the linear motor.

[0004] In a first aspect, the utility model provides a high-precision linear motor, comprising:

[0005] A housing and a driving component and a transmission component arranged inside the housing;

[0006] The driving component comprises a motor mover and a motor stator with a groove inside, wherein the groove has two parallel and opposite magnetic tracks inside;

[0007] The transmission component includes a connecting piece slidably connected to the housing;

[0008] The connecting member is fixedly connected to the motor mover, so that the thrust coil of the motor mover is located between the two magnetic tracks inside the groove and is not connected to the motor stator.

[0009] In a possible implementation, the transmission component further includes a rotating shaft and a bearing;

[0010] The rotating shaft is fixedly connected to the housing, and the bearing is arranged outside the rotating shaft, fixedly connected to the connecting member, and slidably connected to the rotating shaft.

[0011] In a possible implementation, the housing has a vent hole;

[0012] The bearing in the transmission component is an air bearing, which is connected to the vent hole through an air pipe;

[0013] During the operation of the linear motor, external high-pressure gas is input into the air bearing through the air vent and the air pipe, forming an air film between the air bearing and the rotating shaft.

[0014] In a possible implementation, an encoder is also included;

[0015] The encoder is fixedly connected to the housing;

[0016] The transmission component also includes a grating ruler fixedly connected to the connecting member;

[0017] The grating ruler and the encoder are arranged in parallel.

[0018] In a possible implementation, during the operation of the linear motor, the encoder monitors the position of the grating ruler to generate a corresponding monitoring signal.

[0019] In a possible implementation, it further includes a driver for the high-precision linear motor;

[0020] The encoder is communicatively connected to the driver and is used for sending the monitoring signal to the driver.

[0021] In a possible implementation, the driver is used to adjust the position of the driving component according to the monitoring signal.

[0022] In a possible implementation, during operation of the linear motor, the thrust coil reciprocates parallel to the magnetic rail.

[0023] In a possible implementation, it further includes a spring pull seat fixedly connected to the housing;

[0024] The fixing position of the spring pull seat is directly opposite to the side where the fixing position of the bearing is located.

[0025] In a possible implementation, the connecting piece in the transmission component is connected to the spring pull seat via a spring.

[0026] Based on the above scheme, the motor stator and the motor mover in the driving component of the utility model are connected contactlessly, and can achieve non-contact driving through magnetic field interaction during the operation of the motor, greatly reducing mechanical friction and energy consumption during the operation of the motor, and improving movement smoothness, motor positioning accuracy and motor service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] This specification describes the complete and instructive disclosure of the present application, including its best mode of implementation, for those skilled in the art. This specification refers to the accompanying drawings, in which:

[0028] Figure 1 One of the overall structural schematic diagrams of a high-precision linear motor provided by an embodiment of the utility model;

[0029] Figure 2A schematic diagram of the structure of a driving component provided in an embodiment of the utility model;

[0030] Figure 3 A schematic diagram of the structure of a transmission component provided by an embodiment of the utility model;

[0031] Figure 4 A schematic diagram of the structure of an air bearing provided in an embodiment of the utility model;

[0032] Figure 5 The second schematic diagram of the overall structure of a high-precision linear motor provided in an embodiment of the utility model.

[0033] Housing 1, driving component 2, transmission component 3, motor stator 4, motor mover 5, air pipe 6, encoder 7, rotating shaft 8, air bearing 9, connecting piece 10, air port 11, spring 12. DETAILED DESCRIPTION

[0034] Now with reference to the embodiments of the present application in detail, one or more examples of the embodiments of the present application are illustrated in the drawings. Each example is provided to explain the present application, but not to limit the present application. In fact, it will be clear to those skilled in the art that various modifications and changes can be made in the present application without departing from the scope or spirit of the present application. For example, the features described or described as a part of an embodiment can be used together with another embodiment to produce another embodiment. As used in this specification, the terms "first", "second", etc. are used interchangeably to distinguish one component from another component without intending to indicate the position or importance of each component. As used in the specification, unless the context clearly indicates otherwise, the terms "one", "an", "the", and "said" are intended to indicate that there are one or more elements. The terms "include", "include" and "have" are intended to be inclusive, and mean that there may be other elements in addition to the listed elements.

[0035] Now referring to the drawings, in which the same numerals represent the same elements in all the drawings, the present invention will be further explained below in conjunction with specific embodiments.

[0036] Figure 1 This is one of the overall structural diagrams of a high-precision linear motor provided by an embodiment of the utility model. Figure 1 As shown, the high-precision linear motor of the embodiment of the utility model includes a housing 1, a driving component 2 and a transmission component 3.

[0037] Among them, a cavity is provided inside the shell 1, and the driving component 2 and the transmission component 3 are arranged in the cavity of the linear motor shell 1. The driving component 2 and the transmission component 3 are connected, and are used for the driving component 2 to drive the transmission component 3 to perform linear motion during the operation of the linear motor.

[0038] Figure 2 This is a schematic diagram of the structure of a driving component 2 provided in an embodiment of the utility model. Figure 2 As shown, the driving component 2 also includes a motor mover 5 and a motor stator 4 with a groove inside. Among them, the motor stator 4 is fixedly connected to the housing 1, and the fixed connection method can be connected by a fixing member such as a bolt, which is not limited here. At the same time, the groove of the motor stator 4 has two parallel and opposite magnetic tracks inside. During the operation of the linear motor, the motor stator 4 always remains fixed, and a magnetic field is formed between the two magnetic tracks inside the groove. The motor mover 5 does not have any contact or connection relationship with the motor stator 4. It has a thrust coil located inside the groove of the motor stator 4, between the two magnetic tracks and not in contact with the magnetic track. During the operation of the linear motor, the motor mover 5 is energized to cut the magnetic field to generate electromagnetic thrust, so that the thrust coil is parallel to the magnetic track and performs a linear reciprocating motion in the groove. This method can greatly reduce the mechanical friction between the motor mover 5 and the motor stator 4 in the linear motor driving component 2, and improve the motion accuracy of the linear motor.

[0039] Optionally, the motor mover 5 is also fixedly connected to the transmission component 3 to ensure that it can be located between the two magnetic tracks and not in contact with the magnetic tracks. Among them, the transmission component 3 includes a connector 10 that is slidably connected to the housing 1, that is, the connector 10 in the transmission component 3 is connected to the housing 1 and can move relative to the housing 1. Optionally, the sliding connection method can be connected based on a structure such as a slide rail. Further, the connector 10 is fixedly connected to the motor mover 5 to ensure that the thrust coil of the motor mover 5 is located between the two magnetic tracks inside the groove and is not connected to the motor stator 4. The fixed connection method can also be connected by fasteners such as bolts, which is not limited here. In this embodiment, the relative movement of the connector 10 and the housing 1 can be the same movement as that of the motor mover 5. For example, during the operation of the linear motor, if the motor mover 5 of the driving component 2 performs a linear reciprocating motion, the connector 10 that drives it to be fixedly connected can also perform a linear reciprocating motion together.

[0040] Figure 3 This is a schematic diagram of the structure of a transmission component 3 provided in an embodiment of the utility model. Figure 3As shown, in addition to the connecting member 10, the transmission component 3 may also include a rotating shaft 8 and a bearing. The rotating shaft 8 may be a cylindrical shaft structure, fixedly connected to the housing 1, and the fixed connection method may be to fix the bottom of the rotating shaft 8 to one side of the inside of the housing 1 by fasteners such as bolts. The bearing may be a structure with a cylindrical through hole in the middle, and the size of the through hole matches the rotating shaft 8, for accommodating the rotating shaft 8. Based on the matching structure, the bearing is arranged outside the rotating shaft 8 and is slidably connected to the rotating shaft 8, and the bearing can perform reciprocating linear sliding motion up and down relative to the rotating shaft 8. At the same time, the bearing can be fixedly connected to the connecting member 10 by any fastener, and during the operation of the linear motor, it slides up and down relative to the rotating shaft 8 together with the connecting member 10 along with the movement of the motor mover 5. Optionally, the transmission component 3 may include one or more rotating shafts 8 and bearings, and the number of rotating shafts 8 and bearings is the same.

[0041] Figure 4 The structure diagram of an air bearing 9 provided in the embodiment of the utility model is shown in FIG. Figure 4 As shown, the bearing in the embodiment of the utility model can be an air bearing 9, and the inner wall thereof in contact with the rotating shaft 8 is provided with a plurality of tiny air ports 11, and the air pipe 6 for inputting high-pressure gas can be connected to the air port 11, and the high-pressure gas is input to the air bearing 9 through the plurality of air ports 11, so as to form a layer of air film between the inner wall of the air bearing 9 and the outer wall of the rotating shaft 8, so that there is no physical contact between the bearing and the rotating shaft 8, further reducing the mechanical friction generated during the operation of the motor, and improving the motion accuracy of the linear motor. Among them, the thickness of the air film between the air bearing 9 and the rotating shaft 8 can be determined according to the size of the internal through hole of the air bearing 9 and the rotating shaft 8, and the thickness of the air film is usually small, for example, it can be 5 microns.

[0042] In a possible implementation, the air bearing 9 can introduce high-pressure gas outside the linear motor into between the air bearing 9 and the rotating shaft 8 through the air pipe 6. Among them, a vent hole can be provided on the housing 1, and the vent hole and the air bearing 9 are connected through the air pipe 6. During the operation of the linear motor, the external high-pressure gas is input through the vent hole, so that the high-pressure gas is input into the air bearing 9 through the air pipe 6, and an air film is formed between the air bearing 9 and the rotating shaft 8. Optionally, in the case where the transmission component 3 includes multiple air bearings 9, the air pipe 6 can be one or more. Among them, one air pipe 6 can introduce high-pressure gas from the corresponding air holes into different air bearings 9 through multiple passages, and multiple air pipes 6 can introduce high-pressure gas from the corresponding air holes into different air bearings 9 through one or more vent holes.

[0043] Optionally, the transmission component 3 in this embodiment also includes a grating ruler, which has a scale at the micron level and is fixedly connected to the connector 10 in the transmission component 3. At the same time, the linear motor also includes an encoder 7 for reading the scale of the grating ruler. Among them, the encoder 7 can also be located in a cavity inside the housing 1 and is fixedly connected to the housing 1. In order to ensure the accuracy of the reading result, the setting position of the grating ruler is parallel to the setting position of the encoder 7. During the operation of the linear motor, the grating ruler reciprocates with the motor mover 5. During the movement of the grating ruler, the encoder 7 is always parallel to the grating ruler, reads the scale of the grating ruler in real time to monitor the position of the grating ruler, and generates a corresponding monitoring signal.

[0044] Furthermore, the linear motor may also include a driver for driving the driving component 2 to work, and the driver is connected to the encoder 7 for communication. During the operation of the linear motor, the encoder 7 sends the monitoring signal obtained by monitoring the position of the grating scale to the driver in real time, and the driver can adjust the position of the driving component 2 according to the monitoring signal. Specifically, since the motor stator 4 in the driving component 2 remains fixed, adjusting the position of the driving component 2 can be regarded as adjusting the position of the motor mover 5 in the driving component 2. The adjustment feedback system composed of the encoder 7 and the driver can monitor and feedback the working state of the driving component 2, and correct the position of the motor mover 5 in the driving component 2 in real time, ensuring the high precision and stability of the linear motion trajectory generated by the linear motor movement.

[0045] Figure 5 The second schematic diagram of the overall structure of a high-precision linear motor provided by the embodiment of the utility model. Figure 5 As shown, the high-precision linear motor includes a housing 1, a driving component 2, a transmission component 3, an air pipe 6, an encoder 7 and a driver. Among them, the driving component 2, the transmission component 3, the air pipe 6, the encoder 7 and the driver can be arranged inside the housing 1. The driving component 2 includes a motor mover 5 and a motor stator 4, and the motor stator 4 is fixedly connected to the housing 1 and has a groove with two parallel and opposite magnetic tracks inside. The transmission component 3 includes a connecting member 10, a rotating shaft 8, an air bearing 9 and a grating ruler. The connecting member 10 is fixedly connected to the motor mover 5, the air bearing 9 and the grating ruler, and the rotating shaft 8 is fixed at the bottom of the housing 1 and passes through the through hole set inside the air bearing 9. During the operation of the linear motor, the connecting member 10, the motor mover 5, the air bearing 9 and the grating ruler can perform a linear motion reciprocating up and down relative to the rotating shaft 8. Further, the encoder 7 is fixed inside the housing 1 and is parallel to the grating ruler. The housing 1 is provided with a vent hole and is connected to the air bearing 9 through the air pipe 6.

[0046] During the operation of the linear motor, the thrust coil of the motor mover 5 is located between the two magnetic tracks inside the groove and is not connected to the motor stator 4. At the same time, high-pressure gas is introduced between the air bearing 9 and the rotating shaft 8 through the air pipe 6 to form an air film between the air bearing 9 and the rotating shaft 8. Therefore, the relative movement between the motor mover 5 and the motor stator 4, as well as the relative movement between the air bearing 9 and the rotating shaft 8, are free of contact between the components, which greatly reduces the mechanical consumption during the operation of the linear motor, reduces energy consumption, and improves the smoothness of the linear motion process. At the same time, during the operation of the linear motor, the encoder 7 is used to monitor and generate corresponding monitoring signals in real time, and the driver monitors and feedbacks the working status of the driving component 2, and corrects the position of the motor mover 5 in the driving component 2 in real time to ensure the high precision and stability of the linear motion trajectory generated by the linear motor movement.

[0047] Optionally, a spring 12 pull seat fixedly connected to the housing 1 may be provided inside the high-precision linear motor housing 1 of the present embodiment, and the fixed position of the spring 12 pull seat is directly opposite to the side where the bearing is fixed. The connecting member 10 in the transmission component 3 is connected to the spring 12 pull seat through the spring 12 to ensure the overall linear motion of the transmission component 3 during the operation of the motor, and obtain a high-precision linear motion trajectory.

[0048] Based on the above technical features, the embodiment of the utility model realizes non-contact driving through the interaction of the magnetic field between the motor stator 4 and the motor mover 5, thereby reducing the mechanical friction between the mover and the stator. At the same time, non-contact guidance is realized through the air film formed between the air bearing 9 and the rotating shaft 8, thereby reducing the mechanical friction between the air bearing 9 and the rotating shaft 8. As a result, the mechanical consumption during the operation of the linear motor is greatly reduced, and the smoothness of the linear motion process is improved while reducing energy consumption. Further, the structural wear caused by mechanical friction and the energy consumption during the working process are reduced, thereby improving the working life of the linear motor. In addition, the structure can also monitor and feedback the working state of the drive component 2 based on the adjustment feedback system composed of the grating scale, the encoder 7 and the driver, and correct the position of the motor mover 5 in the drive component 2 in real time to ensure the high precision and stability of the linear motion trajectory generated by the linear motor movement.

[0049] This specification uses embodiments to disclose the present application, including the best embodiment, and also enables those skilled in the art to practice the present application, including making and using any device or system and performing any incorporated method. The embodiments of the present application and the technical solutions obtained by slightly changing the embodiments are all within the protection scope of the present application.

Claims

1. A high-precision linear motor, characterized in that: include: A housing and a driving component and a transmission component arranged inside the housing; The driving component comprises a motor mover and a motor stator with a groove inside, wherein the groove has two parallel and opposite magnetic tracks inside; The transmission component includes a connecting piece slidably connected to the housing; The connecting member is fixedly connected to the motor mover, so that the thrust coil of the motor mover is located between the two magnetic tracks inside the groove and is not connected to the motor stator.

2. The high-precision linear motor according to claim 1, characterized in that: The transmission component also includes a rotating shaft and a bearing; The rotating shaft is fixedly connected to the housing, and the bearing is arranged outside the rotating shaft, fixedly connected to the connecting member, and slidably connected to the rotating shaft.

3. The high-precision linear motor according to claim 2, characterized in that: The housing has a vent hole; The bearing in the transmission component is an air bearing, which is connected to the vent hole through an air pipe; During the operation of the linear motor, external high-pressure gas is input into the air bearing through the air vent and the air pipe, forming an air film between the air bearing and the rotating shaft.

4. The high-precision linear motor according to claim 2, characterized in that: Also included is an encoder; The encoder is fixedly connected to the housing; The transmission component also includes a grating ruler fixedly connected to the connecting member; The grating ruler and the encoder are arranged in parallel.

5. The high-precision linear motor according to claim 4, characterized in that: During the operation of the linear motor, the encoder monitors the position of the grating ruler to generate a corresponding monitoring signal.

6. The high-precision linear motor according to claim 5, characterized in that: Also included is a driver for the high-precision linear motor; The encoder is communicatively connected to the driver and is used for sending the monitoring signal to the driver.

7. The high-precision linear motor according to claim 6, characterized in that: The driver is used to adjust the position of the driving component according to the monitoring signal.

8. The high-precision linear motor according to claim 1, characterized in that: During operation of the linear motor, the thrust coil reciprocates parallel to the magnetic track.

9. The high-precision linear motor according to claim 2, characterized in that: Also includes a spring pull seat fixedly connected to the housing; The fixing position of the spring pull seat is directly opposite to the side where the fixing position of the bearing is located.

10. The high-precision linear motor according to claim 9, characterized in that: The connecting piece in the transmission component is connected to the spring pull seat through a spring.

Images