Linear motor with bidirectional position detection

Abstract

The utility model discloses a bidirectional position detection linear motor, which comprises a linear motor body, a housing, a first sensor and a first inductor, the housing sleeves the linear motor body and is fixed with the linear motor body, the first sensor is connected with the housing, the first inductor is connected with a screw assembly in the linear motor body, and the first sensor is connected with the screw assembly in the linear motor body. The first sensor is arranged in the axial direction of the screw assembly, the first sensor is used for detecting the first position of the screw assembly when being matched with the first sensor, one part of the second sensor is matched with the housing, the second sensor is connected with the screw assembly, the second sensor is arranged in the radial direction of the screw assembly, and the second sensor is used for detecting the second position of the screw assembly when being matched with the second sensor. The second sensor is used for detecting the second position of the screw assembly when matched with the second inductor. According to the utility model, the retraction stroke and the extension stroke of the screw assembly can be detected.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, specifically to a linear motor with bidirectional position detection. Background Technology

[0002] Fixed-axis linear motors are an effective linear transmission mechanism that reduces the need for slide rails, pulleys, and other components in linear transmission mechanisms, greatly simplifying their use and making them widely used in linear motion solutions.

[0003] The motor uses a screw assembly and nut drive structure internally, directly converting the rotational motion of the nut into the linear motion of the screw assembly, simplifying the motor's structural design. Due to its stable quality, small size, high thrust, and availability in various step length specifications, it has wide market applications.

[0004] When a fixed-axis linear motor is used as a driver in industrial production, it is usually necessary to control the stroke of the screw assembly in the fixed-axis linear motor. The current method is to install a cover on the linear motor body, and a first sensor is installed on the cover. A first sensing element is installed at the end of the screw assembly in the linear motor body. When the screw assembly retracts, the first sensing element on the screw assembly is detected by the first sensor, and the controller controls the motor body to stop working, and the screw assembly stops retracting to avoid the screw assembly exerting a destructive force on the cover.

[0005] In the above structure, only the retraction of the screw assembly is controlled, and the stroke of the screw assembly when it extends is controlled. For example, when the screw assembly extends to its maximum stroke, the screw assembly abuts against the limiting part at the front end of the motor housing. However, since there is no stroke control, the motor body is still in working state at this time, which causes damage to the rotor assembly and screw and screw assembly inside the motor body. Utility Model Content

[0006] This invention provides a linear motor with bidirectional position detection, which can detect the retraction and extension stroke of the screw assembly.

[0007] The technical solutions to the above technical problems are as follows:

[0008] A linear motor for bidirectional position detection includes a linear motor body, a housing, a first sensor, and a first inductor. The housing is fitted onto and fixed to the linear motor body. The first sensor is connected to the housing, and the first inductor is connected to a screw assembly in the linear motor body. The first inductor is arranged along the axial direction of the screw assembly. When the first sensor and the first inductor cooperate, they are used to detect a first position of the screw assembly. The motor also includes a second sensor and a second inductor. A portion of the second sensor cooperates with the housing. The second inductor is connected to the screw assembly and is arranged along the radial direction of the screw assembly. When the second sensor and the second inductor cooperate, they are used to detect a second position of the screw assembly.

[0009] Furthermore, the screw assembly is provided with a first mounting hole and a second mounting hole. The first mounting hole is arranged along the axial direction of the screw assembly, and the second mounting hole is arranged along the radial direction of the screw assembly. The first sensor cooperates with the first mounting hole, and the second sensor cooperates with the second mounting hole.

[0010] Furthermore, a second through hole is provided on the circumferential surface of the cover, and the second sensor includes a second sensor body and a second wire, the second wire cooperating with the second through hole.

[0011] Furthermore, it also includes a mounting component for mounting a second sensor. One end of the linear motor body is provided with an extension sleeve, and the screw assembly passes through the extension sleeve. The mounting component includes a first mounting sleeve and a second mounting sleeve. The first mounting sleeve is fitted onto the extension sleeve and fixed to the extension sleeve. The second mounting sleeve is located outside the axial end face of the extension sleeve. The other part of the second sensor is located inside the second mounting sleeve and cooperates with the second mounting sleeve.

[0012] Furthermore, the second mounting sleeve is provided with a slot, at least a portion of which is tapered, and another portion of the second sensor engages with the slot.

[0013] When the linear motor rotates clockwise, the screw assembly moves linearly from left to right (i.e., the screw assembly retracts). The screw assembly, carrying the first and second sensors, moves linearly from left to right. When the first sensor detects the screw, the screw assembly retracts to its limit position and sends a detection signal to the controller. The controller then stops the linear motor, or reverses the linear motor to move the screw assembly linearly from right to left. When the linear motor rotates counter-clockwise, the screw assembly moves linearly from right to left (i.e., the screw assembly extends). The screw assembly, carrying the first and second sensors, moves linearly from right to left. When the second sensor detects the screw, the screw assembly extends to its limit position and sends a detection signal to the controller. The controller then stops the linear motor, or reverses the linear motor to move the screw assembly linearly from left to right. Therefore, this invention achieves bidirectional detection of the screw assembly in the linear motor during linear motion through the above structure. Attached Figure Description

[0014] Figure 1 This is an exploded view of a linear motor for bidirectional position detection.

[0015] Figure 2 This is a schematic diagram showing the first sensor and the first sensor working together in a linear motor for bidirectional position detection.

[0016] Figure 3 This is a schematic diagram showing the second sensor in a linear motor for bidirectional position detection working in conjunction with a second sensor unit.

[0017] Figure 4 for Figure 3 Enlarged view of part P in the image.

[0018] Figure 5 This is a diagram showing the combination of the second sensor and the mounting components.

[0019] Labels in the attached diagram:

[0020] Linear motor body 1, screw assembly 1a, first mounting hole 1b, second mounting hole 1c, extension sleeve 1d, stator assembly 1e, rotor assembly 1f, guide sleeve 1g, cover 2, radial mounting hole 2a, second through hole 2b, clearance hole 2c, first sensor 3, first sensor body 3a, first wire 3b, first sensor 4, second sensor 5, second sensor body 5a, second wire 5b, second sensor 6, mounting component 7, first mounting sleeve 7a, second mounting sleeve 7b, slot 7c. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0022] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0024] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0025] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0026] like Figures 1 to 5As shown, the bidirectional position detection linear motor of this utility model includes a linear motor body 1, a housing 2, a first sensor 3, and a first inductor 4. One end of the housing 2 is closed, and the other end of the housing 2 has an opening. The housing 2 is fitted onto the linear motor body 1 and fixed to the linear motor body 1. The first sensor 3 is connected to the housing 2. The closed end of the housing 2 is provided with a radial mounting hole 2a. A partition 2d is provided between the radial mounting hole 2a and the clearance hole 2c. The first sensor 3 includes a first sensor body 3a and a first wire 3b connected to the first sensor body 3a. The first sensor body 3a cooperates with the radial mounting hole 2a. The first wire 3b extends to the outside of the radial mounting hole 2a. After passing through the clearance hole 2c, the obstruction of the first sensor 3 to the first inductor 4 can be reduced.

[0027] The first sensor 4 is connected to the screw assembly 1a in the linear motor body 1. The linear motor body 1 also has a stator assembly 1e, a rotor assembly 1f, and a guide sleeve 1g. The rotor assembly 1f includes a rotor body and a nut. The nut is located in the inner hole of the rotor body and is fixed to the rotor body. The screw assembly 1a consists of a screw and a splined shaft fixed to the screw. The screw is threadedly connected to the nut in the rotor assembly 1f, and the splined shaft is slidably engaged with the guide sleeve 1g.

[0028] The screw assembly 1a is provided with a first mounting hole 1b, which is located on the screw in the screw assembly 1a. The first mounting hole 1b is arranged along the axial direction of the screw assembly 1a. The first sensor 4 is fitted with the first mounting hole 1b. The first sensor 4 is cylindrical. One end of the first sensor 4 is preferably fitted with the first mounting hole 1b by an interference fit, and the other end of the first sensor 4 is exposed outside the first mounting hole 1b.

[0029] The first sensor 4 is arranged along the axial direction of the screw assembly 1a. When the first sensor 3 cooperates with the first sensor 4, it is used to detect the first position of the screw assembly 1a. The first sensor 3 preferably adopts a Hall sensor, and the first sensor 4 preferably adopts a magnet. When the Hall sensor senses the magnet, the first position of the screw assembly 1a is detected.

[0030] This utility model also includes a second sensor 5 and a second sensor 6. A part of the second sensor 5 is fitted with the housing 2. The housing 2 has a second through hole 2b on its circumferential surface. The second sensor 5 includes a second sensor body 5a and a second wire 5b connected to the second sensor body 5a. The second wire 5b is bent and passes through the second through hole 2b, so that the second wire 5b fits with the second through hole 2b.

[0031] This utility model also includes a mounting component 7 for mounting the second sensor 5. One end of the linear motor body 1 is provided with an extension sleeve 1d. The screw assembly 1a passes through the extension sleeve 1d. After the cover 2 is fixed to the linear motor body 1, an annular cavity is formed between the extension sleeve 1d and the cover 2. The mounting component 7 includes a first mounting sleeve 7a and a second mounting sleeve 7b. The first mounting sleeve 7a is located in the annular cavity between the extension sleeve 1d and the cover 2, and the first mounting sleeve 7a is sleeved on the extension sleeve 1d and fixed to the extension sleeve 1d. The second mounting sleeve 7b is located outside the axial end face of the extension sleeve 1d. The other part of the second sensor 5 is located inside the second mounting sleeve 7b and cooperates with the second mounting sleeve 7b.

[0032] The second mounting sleeve 7b is provided with a slot 7c, at least a portion of which is conical. The other portion of the second sensor 5 engages with the slot 7c. In this invention, the slot 7c is opened from the inner wall of the second mounting sleeve 7b, and the second sensor body 5a engages with the slot 7c, with the shape of the second sensor body 5a matching that of the slot 7c.

[0033] The second sensor 6 is connected to the screw assembly 1a and is arranged radially along the screw assembly 1a. The screw assembly 1a is provided with a second mounting hole 1c, which is located on the screw in the screw assembly 1a and is arranged radially along the screw assembly 1a. The second sensor 6 cooperates with the second mounting hole 1c.

[0034] When the second sensor 5 cooperates with the second sensor 6, it is used to detect the second position of the screw assembly 1a. The second sensor 5 is preferably a Hall sensor, and the second sensor 6 is preferably a magnet. When the second sensor 5 senses the second sensor 6, the second position of the screw assembly 1a is detected.

[0035] The working process of this utility model is as follows:

[0036] like Figure 2 When the linear motor body 1 rotates forward, it causes the screw assembly 1a to move linearly from left to right (the screw assembly 1a retracts). The screw assembly 1a, along with the first sensor 4 and the second sensor 6, moves linearly from left to right, causing the first sensor 4 to gradually move closer to the first sensor 3, while the second sensor 6 gradually moves away from the second sensor 5. When the first sensor 3 detects the first sensor 4, the screw assembly 1a retracts to its limit position. The first sensor 3 feeds back the detection signal to the controller (the controller uses a PLC, which is not shown in the figure). The controller controls the linear motor body 1 to stop working, or the controller controls the linear motor body 1 to reverse, causing the screw assembly 1a to move linearly from right to left.

[0037] like Figure 3When the linear motor body 1 reverses, it causes the screw assembly 1a to move linearly from right to left (the screw assembly 1a extends). The screw assembly 1a, along with the first sensor 4 and the second sensor 6, moves linearly from right to left, causing the first sensor 4 to gradually move away from the first sensor 3, while the second sensor 6 gradually moves closer to the second sensor 5. When the second sensor 5 detects the second sensor 6, the screw assembly 1a extends to its limit position. The second sensor 6 feeds back the detection signal to the controller (the controller uses a PLC, which is not shown in the figure). The controller controls the linear motor body 1 to stop working, or the controller controls the linear motor body 1 to rotate forward, causing the screw assembly 1a to move linearly from left to right.

Claims

1. A linear motor for bidirectional position detection, comprising a linear motor body (1), a housing (2), a first sensor (3), and a first inductor (4), wherein the housing (2) is fitted onto the linear motor body (1) and fixed thereto, the first sensor (3) is connected to the housing (2), and the first inductor (4) is connected to a screw assembly (1a) in the linear motor body (1), the first inductor (4) is arranged along the axial direction of the screw assembly (1a), and the first sensor (3) and the first inductor (4) are used to detect the first position of the screw assembly (1a) when they cooperate, characterized in that, It also includes a second sensor (5) and a second sensor (6). A part of the second sensor (5) is engaged with the housing (2). The second sensor (6) is connected to the screw assembly (1a). The second sensor (6) is arranged radially along the screw assembly (1a). When the second sensor (5) and the second sensor (6) are engaged, they are used to detect the second position of the screw assembly (1a).

2. The linear motor for bidirectional position detection according to claim 1, characterized in that, The screw assembly (1a) is provided with a first mounting hole (1b) and a second mounting hole (1c). The first mounting hole (1b) is arranged along the axial direction of the screw assembly (1a), and the second mounting hole (1c) is arranged along the radial direction of the screw assembly (1a). The first sensor (4) cooperates with the first mounting hole (1b), and the second sensor (6) cooperates with the second mounting hole (1c).

3. The linear motor for bidirectional position detection according to claim 1, characterized in that, The casing (2) has a second through hole (2b) on its circumferential surface. The second sensor (5) includes a second sensor body (5a) and a second wire (5b). The second wire (5b) is engaged with the second through hole (2b).

4. The linear motor for bidirectional position detection according to any one of claims 1 to 3, characterized in that, It also includes a mounting component (7) for mounting a second sensor (5). One end of the linear motor body (1) is provided with an extension sleeve (1d). The screw assembly (1a) passes through the extension sleeve (1d). The mounting component includes a first mounting sleeve (7a) and a second mounting sleeve (7b). The first mounting sleeve (7a) is fitted onto the extension sleeve (1d) and fixed to the extension sleeve (1d). The second mounting sleeve (7b) is located outside the axial end face of the extension sleeve (1d). The other part of the second sensor (5) is located inside the second mounting sleeve (7b) and cooperates with the second mounting sleeve (7b).

5. The linear motor for bidirectional position detection according to claim 4, characterized in that, The second mounting sleeve (7b) is provided with a slot (7c), at least a portion of which is tapered, and the other part of the second sensor (5) engages with the slot (7c).

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