Shaft driving type linear motor with external encoder

Abstract

The utility model discloses a shaft driving type linear motor with an external encoder, which belongs to the technical field of linear motors, and comprises a magnetic shaft assembly and a body assembly, the body assembly is fixed on a working platform, the magnetic shaft assembly is arranged in the body assembly in a sliding manner, a plurality of cylindrical magnetic steels are arranged in the magnetic shaft assembly, and the magnetic steels are arranged in the magnetic shaft assembly. Different magnetic poles of adjacent magnetic steels are close to each other, a three-phase winding is arranged in the body assembly, three leads of the three-phase winding are electrified with three-phase alternating current, an alternating magnetic field generated after the three-phase winding is electrified is coupled with a magnetic field of the magnetic steels in the magnetic shaft assembly, and then the magnetic shaft assembly is driven to reciprocate in the body assembly. The linear motor disclosed by the technical scheme of the utility model has the advantages of low inertia, high acceleration and no cogging effect, is relatively high in response speed and precision, and is suitable for application scenes with high frequency requirements.

Description

Technical Field

[0001] The utility model relates to the technical field of linear motors, in particular to a shaft-driven linear motor with an external encoder. Background Art

[0002] A linear motor is a motor that performs linear motion. A linear motor includes two parts: a mover and a stator. As the name implies, the stator is the fixed part, and the mover is the part that can achieve specific motion when in use. Currently, linear motors on the market basically use the main body where the coil is located as the mover, such as plate-type linear motors. Some plate-type linear motors are equipped with an iron core inside. The linear motors in the above-mentioned prior art have the following disadvantages: on the one hand, the structure of the linear motor with the main body as the mover is relatively large, and is not suitable for some scenarios with strict requirements on the use space; on the other hand, the linear motor with an iron core has a cogging effect, and the cogging effect will cause the mover to have greater resistance during movement, causing energy loss and affecting the use of the linear motor. Based on the above characteristics, the utility model provides a shaft-driven linear motor with an external encoder, which uses the main body with a coil as the mover, greatly reducing the size of the linear motor. At the same time, no iron core is provided, thereby avoiding the influence of the cogging effect. Summary of the invention

[0003] In response to the above technical problems, the technical solution adopted by the utility model is: an axis-driven linear motor with an external encoder, including a magnetic axis assembly and a main body assembly, the main body assembly is fixed on a working platform, the magnetic axis assembly is slidably arranged inside the main body assembly, a plurality of magnetic steels are arranged inside the magnetic axis assembly, the magnetic steels are cylindrical, and the different magnetic poles of adjacent magnetic steels are close to each other, a three-phase winding is arranged inside the main body assembly, three-phase alternating current is passed through the three leads of the three-phase winding, and the alternating magnetic field generated after the three-phase winding is energized is coupled with the magnetic field of the magnetic steel in the magnetic axis assembly, thereby driving the magnetic axis assembly to reciprocate inside the main body assembly.

[0004] Furthermore, the magnetic axis assembly includes a magnetic axis sleeve, a plurality of magnetic steels are arranged inside the magnetic axis sleeve, and magnetic axis end covers are arranged at both ends of the magnetic axis sleeve, and the magnetic axis end covers are used to fix the magnetic steels inside the magnetic axis sleeve.

[0005] Furthermore, the magnetic axis assembly is connected to a measurement feedback device, which is used to measure the relative position between the magnetic axis assembly and the body assembly. The measurement feedback device is connected to the driver via an encoder connecting line. One end of the three-phase winding converges into a power line, and the power line is connected to the driver. The driver controls the electrical signal passing through the three-phase winding via the power line.

[0006] Furthermore, the measurement feedback device includes an external guide rail, which is connected to the magnetic axis assembly through a magnetic axis clamp, a magnetic scale connecting piece is provided on the external guide rail, a magnetic scale is provided on the magnetic scale connecting piece, a magnetic scale is provided on the magnetic scale, a magnetic grid position encoder is provided above the magnetic scale, the magnetic grid position encoder cooperates with the magnetic scale to detect the relative position of the magnetic axis assembly and the main body assembly in real time, and the magnetic grid position encoder is connected to the encoder connecting line.

[0007] Furthermore, the measurement feedback device includes an external guide rail, which is connected to the magnetic axis assembly through a magnetic axis clamp, a grating scale connecting piece is provided on the external guide rail, a grating scale is provided on the grating scale connecting piece, a grating position encoder is provided above the grating scale, the grating scale and the grating position encoder are used together to detect the relative position of the magnetic axis assembly and the main body assembly in real time, and the grating position sensor is connected to the driver through an encoder connecting line.

[0008] Furthermore, a guide seat is fixedly installed above the main body component, the external guide rail is slidably installed on the guide seat, an encoder connector is fixedly installed on the main body component, and the magnetic grating position encoder or the grating position encoder is fixedly installed on the encoder connector.

[0009] Furthermore, a wire pressing plate is provided on the side of the body component, and the wire pressing plate is used to fix the power line on the side of the body component. The wire pressing plate is installed on the body component by screws.

[0010] Furthermore, a threaded hole and a pin hole are provided at the bottom of the body component, the threaded hole is used to achieve fixed installation of the body component, and the pin hole is used to achieve positioning of the body component.

[0011] Furthermore, an anti-collision pad is fixedly installed on one end of the magnetic axis assembly away from the magnetic axis clamp seat, and the anti-collision pad is used to prevent the magnetic axis assembly from collision damage. The end of the magnetic axis assembly is provided with a threaded hole for connecting with the working part.

[0012] Furthermore, the three-phase winding includes an A-phase winding, a B-phase winding and a C-phase winding. The A-phase winding, the B-phase winding and the C-phase winding are respectively provided with four coil windings, each coil winding is alternately arranged on the winding support shaft in sequence, and a spacer is arranged between every two adjacent winding coils. The winding support shaft is sleeved on the outside of the magnetic axis assembly.

[0013] Compared with the prior art, the beneficial effects of the utility model are as follows: the linear motor disclosed in the utility model uses the magnetic shaft assembly as the mover, which expands the applicable scenarios of the linear motor, has no iron core inside, has the characteristics of low inertia, high acceleration, no cogging effect, etc., has a high thrust density, and a fast dynamic response speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a front view of the overall structure of the utility model (including power cord and encoder connecting wire).

[0015] Figure 2 It is a top view of the overall structure of the utility model.

[0016] Figure 3 It is a bottom view of the overall structure of the utility model.

[0017] Figure 4 It is an axonometric drawing of the overall structure of the utility model.

[0018] Figure 5 It is a schematic diagram of the internal structure of the main body component of the utility model.

[0019] Figure numbers: 1-anti-collision pad; 2-magnetic axis assembly; 3-body assembly; 4-wire pressing plate; 5-power cord; 6-magnetic axis clamp; 7-external guide rail; 8-encoder connecting wire; 9-guide seat; 10-encoder connector; 11-magnetic scale connector; 12-position encoder for magnetic grid; 13-threaded hole; 14-pin hole; 15-winding support shaft; 16-spacer; 17-A phase winding; 18-B phase winding; 19-magnetic scale; 20-C phase winding. DETAILED DESCRIPTION

[0020] The technical solution of the utility model is described in detail below in conjunction with the accompanying drawings.

[0021] Example: Figure 1-Figure 5 As shown, an axis-driven linear motor with an external encoder includes a magnetic axis component 2 and a main body component 3. The main body component 3 is fixed on a working platform. The magnetic axis component 2 is slidably arranged inside the main body component 3. A plurality of magnetic steels are arranged inside the magnetic axis component 2. The magnetic steels are cylindrical. The different magnetic poles of adjacent magnetic steels are close to each other. A three-phase winding is arranged inside the main body component 3. Three-phase alternating current is passed through three leads of the three-phase winding. The alternating magnetic field generated after the three-phase winding is energized is coupled with the magnetic field of the magnetic steel in the magnetic axis component 2, thereby driving the magnetic axis component 2 to reciprocate inside the main body component 3.

[0022] The magnetic axis assembly 2 comprises a magnetic axis outer sleeve, a plurality of magnetic steels are arranged inside the magnetic axis outer sleeve, and magnetic axis end covers are arranged at both ends of the magnetic axis outer sleeve, and the magnetic axis end covers are used to fix the magnetic steels inside the magnetic axis outer sleeve.

[0023] like Figure 1As shown, the magnetic axis assembly 2 is connected to a measuring feedback device, which is used to measure the relative position between the magnetic axis assembly 2 and the main body assembly 3. The measuring feedback device is connected to the driver through an encoder connecting line 8. One end of the three-phase winding converges into a power line 5, and the power line 5 is connected to the driver. The driver controls the electrical signal passing through the three-phase winding through the power line 5.

[0024] like Figure 1-Figure 4 As shown, the measurement feedback device in the form of a magnetic grating includes an external guide rail 7, which is connected to the magnetic axis assembly 2 through a magnetic axis clamp 6, a magnetic grating scale connector 11 is provided on the external guide rail 7, a magnetic grating scale connector 11 is provided with a magnetic grating scale 19, a magnetic grating position encoder 12 is provided above the magnetic grating scale 19, the magnetic grating position encoder 12 cooperates with the magnetic grating scale 19 to detect the relative position of the magnetic axis assembly 2 and the main body assembly 3 in real time, and the magnetic grating position encoder 12 is connected to the encoder connecting line 8.

[0025] like Figure 1-Figure 4 As shown, the grating-type measurement feedback device includes an external guide rail 7, which is connected to the magnetic axis assembly 2 through a magnetic axis clamp 6, a grating scale connecting piece is provided on the external guide rail 7, a grating scale is provided on the grating scale connecting piece, a grating position encoder is provided above the grating scale, and the grating scale and the grating position encoder are used together to detect the relative position of the magnetic axis assembly 2 and the main body assembly 3 in real time, and the grating position sensor is connected to the driver through an encoder connecting line 8.

[0026] like Figure 1-Figure 3 As shown, a guide seat 9 is fixedly installed above the main body component 3, the external guide rail 7 is slidably installed on the guide seat 9, an encoder connector 10 is fixedly installed on the main body component 3, and a magnetic grating position encoder 12 or a grating position encoder is fixedly installed on the encoder connector 10.

[0027] like Figure 1 As shown, a wire pressing plate 4 is provided on the side of the main body component 3, and the wire pressing plate 4 is used to fix the power line 5 on the side of the main body component 3. The wire pressing plate 4 is installed on the main body component 3 by screws.

[0028] like Figure 3 As shown, a threaded hole 13 and a pin hole 14 are provided at the bottom of the body component 3 . The threaded hole 13 is used to achieve fixed installation of the body component 3 , and the pin hole 14 is used to achieve positioning of the body component 3 .

[0029] like Figure 1-Figure 3 As shown, an anti-collision pad 1 is fixedly installed on one end of the magnetic axis assembly 2 away from the magnetic axis clamp seat 6. The anti-collision pad 1 is used to prevent the magnetic axis assembly 2 from collision damage. A threaded hole is provided at the end of the magnetic axis assembly 2, and the threaded hole is used to connect with the working part.

[0030] like Figure 5 As shown, the three-phase winding includes an A-phase winding 17, a B-phase winding 18 and a C-phase winding 20. The A-phase winding 17, the B-phase winding 18 and the C-phase winding 20 are respectively provided with four coil windings, each coil winding is alternately arranged on the winding support shaft 15 in sequence, and a spacer 16 is arranged between every two adjacent winding coils. The winding support shaft 15 is sleeved on the outside of the magnetic axis assembly 2.

[0031] The working principle of an axis-driven linear motor with an external encoder disclosed by the utility model is as follows: when in use, the power cord 5 and the encoder connecting line 8 need to be connected to a driver (not shown in the figure), and the driver controls the parameters of the electrical signal input by the power cord 5 to the A-phase winding 17, the B-phase winding 18 and the C-phase winding 20, and then controls the motion parameters of the magnetic axis component 2. The adjusted parameters include frequency, stroke, etc. The measurement feedback device can take the form of a magnetic grating or a grating, and cooperate with corresponding sensors to collect the motion parameters of the magnetic axis component 2, and transmit the digital signal to the driver through the encoder connecting line 8, thereby obtaining the feedback information of the motor. The end of the magnetic axis component 2 is connected to a working part, and the magnetic axis component 2 drives the working part to complete the set motion form during the movement.

Claims

1. A shaft-driven linear motor with an external encoder, characterized in that: The invention comprises a magnetic axis component (2) and a body component (3), wherein the body component (3) is fixed on a working platform, the magnetic axis component (2) is slidably arranged inside the body component (3), a plurality of magnetic steels are arranged inside the magnetic axis component (2), the magnetic steels are cylindrical, and the different magnetic poles of adjacent magnetic steels are close to each other, and a three-phase winding is arranged inside the body component (3), and three-phase alternating current is passed through three leads of the three-phase winding. When the three-phase winding is energized, the alternating magnetic field generated is coupled with the magnetic field of the magnetic steel in the magnetic axis component (2), thereby driving the magnetic axis component (2) to reciprocate inside the body component (3).

2. The shaft-driven linear motor with an external encoder according to claim 1, characterized in that: The magnetic axis assembly (2) comprises a magnetic axis outer sleeve, a plurality of magnetic steels are arranged inside the magnetic axis outer sleeve, and magnetic axis end covers are arranged at both ends of the magnetic axis outer sleeve, and the magnetic axis end covers are used to fix the magnetic steels inside the magnetic axis outer sleeve.

3. The shaft-driven linear motor with an external encoder according to claim 1, characterized in that: The magnetic axis component (2) is connected to a measurement feedback device, and the measurement feedback device is used to measure the relative position between the magnetic axis component (2) and the body component (3). The measurement feedback device is connected to the driver via an encoder connection line (8). One end of the three-phase winding converges into a power line (5), and the power line (5) is connected to the driver. The driver controls the electrical signal passing through the three-phase winding via the power line (5).

4. The shaft-driven linear motor with an external encoder according to claim 3, characterized in that: The measurement feedback device comprises an external guide rail (7), the external guide rail (7) is connected to the magnetic axis assembly (2) via a magnetic axis clamp (6), a magnetic scale connector (11) is provided on the external guide rail (7), a magnetic scale (19) is provided on the magnetic scale connector (11), a magnetic grid position encoder (12) is provided above the magnetic scale (19), the magnetic grid position encoder (12) and the magnetic grid position encoder (19) cooperate to detect the relative position of the magnetic axis assembly (2) and the main body assembly (3) in real time, and the magnetic grid position encoder (12) is connected to an encoder connecting line (8).

5. The shaft-driven linear motor with an external encoder according to claim 3, characterized in that: The measurement feedback device comprises an external guide rail (7), the external guide rail (7) is connected to the magnetic axis assembly (2) via a magnetic axis clamp (6), a grating scale connecting piece is arranged on the external guide rail (7), a grating scale is arranged on the grating scale connecting piece, a grating position encoder is arranged above the grating scale, the grating scale and the grating position encoder cooperate to detect the relative position of the magnetic axis assembly (2) and the main body assembly (3) in real time, and the grating position sensor is connected to the driver via an encoder connecting line (8).

6. The shaft-driven linear motor with an external encoder according to claim 4 or 5, characterized in that: A guide seat (9) is fixedly mounted above the main body component (3), the external guide rail (7) is slidably mounted on the guide seat (9), an encoder connector (10) is fixedly mounted on the main body component (3), and a magnetic grating position encoder (12) or a grating position encoder is fixedly mounted on the encoder connector (10).

7. The shaft-driven linear motor with an external encoder according to claim 3, characterized in that: A wire pressing plate (4) is provided on the side of the main body component (3), and the wire pressing plate (4) is used to fix the power line (5) on the side of the main body component (3). The wire pressing plate (4) is installed on the main body component (3) by means of screws.

8. The shaft-driven linear motor with an external encoder according to claim 1, characterized in that: The bottom of the body component (3) is provided with a threaded hole (13) and a pin hole (14); the threaded hole (13) is used to achieve fixed installation of the body component (3), and the pin hole (14) is used to achieve positioning of the body component (3).

9. The shaft-driven linear motor with an external encoder according to claim 4, characterized in that: An anti-collision pad (1) is fixedly mounted on one end of the magnetic axis assembly (2) away from the magnetic axis clamp seat (6), and the anti-collision pad (1) is used to prevent the magnetic axis assembly (2) from collision damage. A threaded hole is provided at the end of the magnetic axis assembly (2) for connection with a working component.

10. The shaft-driven linear motor with an external encoder according to claim 1, characterized in that: The three-phase winding comprises an A-phase winding (17), a B-phase winding (18) and a C-phase winding (20); the A-phase winding (17), the B-phase winding (18) and the C-phase winding (20) are respectively provided with four coil windings, each coil winding is alternately arranged on the winding support shaft (15) in sequence, and a spacer (16) is arranged between every two adjacent winding coils; the winding support shaft (15) is sleeved on the outside of the magnetic axis assembly (2).

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