Fixed shaft type linear motor integrated with encoder and Hall sensor
By adding brackets and support to fixed shaft linear motors, the integrated installation of encoder and Hall sensors is achieved, which solves the problem of lack of closed-loop control function in the prior art, reduces product costs and expands market applications.
Patent Information
- Application Number
- CN202421898033.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-07
- Publication Date
- 2025-05-30
- Estimated Expiration
- 2034-08-07
AI Technical Summary
The lack of integrated encoder and Hall sensor capabilities in application environments where closed-loop control is required, resulting in the need of customers to add additional electrical signal feedback systems, increasing product costs and limiting market share.
By adding a bracket, fixing the bracket and the end cover of the motor, fixing the encoder and the bracket, and adding a support to fix the support and the bracket, fixing the Hall sensor and the bracket, fixing the Hall induction magnet with the screw, so that the Hall sensor and the support are fixed and correspond to the Hall induction magnet, realizing the integrated installation of the encoder and the Hall sensor.
The closed-loop control function of fixed-axis linear motor is realized, which reduces customer product costs and expands the scope of application of motors in the market.
Smart Images
Figure CN222928226U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of motors, and particularly relates to a fixed-axis linear motor integrating an encoder and a Hall sensor. Background Art
[0002] The fixed-axis linear motor of model SIZE8 is a linear motor mass-produced by our company at present. Due to its stable quality, small volume, large thrust, and multiple step size specifications available, it has a wide range of market applications. However, due to the open-loop control characteristics of the stepper motor itself, for special application environments that require closed-loop control, customers need to add an additional electrical signal feedback system, which increases the cost of customer products and also restricts the market share of the fixed-axis linear motor.
[0003] Our company early produced a fixed-axis linear motor encoder rotor structure, and its structure is as follows: the rear part of the inner ring of the encoder bearing is the code disk mating surface; the encoder rotor includes an aluminum part with an axial through hole, a magnet is fixedly sleeved outside the aluminum part, the aluminum part has an axial through screw hole, the rear part of the inner ring of the front bearing is inserted and fixed at the front end of the through hole of the aluminum part, and the front part of the inner ring of the encoder bearing is inserted and fixed at the rear end of the through hole of the aluminum part; the mounting plate and the machine shell are fixedly connected to form a motor shell; the front coil is fixed on the mounting plate, and the front part of the front coil extends out of the mounting plate; the rear coil is fixed inside the machine shell, and the rear part of the rear coil extends out of the machine shell; the middle pole plate is fixed between the front coil and the rear coil; the front coil is sleeved on the outer ring of the front bearing, and the rear coil is sleeved on the outer ring of the encoder bearing; the connector is fixed on the rear coil; the encoder base is fixed on the connector; the encoder PCB board and the encoder cover are fixed on the encoder base; the inner hole of the encoder code disk is sleeved on the code disk mating surface of the encoder bearing and is in interference fit; the encoder PCB board and the encoder code disk are located inside the encoder cover; the screw component passes through the shaft holes of the front coil, the encoder rotor, and the rear coil, and the external thread section of the screw component is matched with the internal thread of the axial through screw hole of the encoder rotor.
[0004] The above-mentioned fixed-axis linear motor encoder rotor structure is relatively complex, and only the encoder function is integrated on the fixed-axis linear motor. At present, users hope to integrate a Hall sensor in addition to the encoder function. Therefore, in the fierce market environment, in order to solve the application problems of customers, the demand for adding a closed-loop control function to the fixed-axis linear motor body is very urgent. How to integrate the components for feeding back the above electrical signals on the fixed-axis linear motor is the current problem. Content of the Utility Model
[0005] The utility model provides a fixed-axis linear motor integrating an encoder and a Hall sensor, and the fixed-axis linear motor of the utility model adds the integrated installation of an encoder and a Hall sensor.
[0006] The technical solution for solving the above technical problems is as follows:
[0007] A fixed-axis linear motor integrating an encoder and a Hall sensor, comprising a fixed-axis linear motor body and an encoder. The encoder is provided with a through hole for a screw in the fixed-axis linear motor body to pass through. The first part of the encoder is fixed to the rotor shaft of the axial linear motor body, and the second part of the encoder is fixed to the end cover of the fixed-axis linear motor body. It further includes a bracket, a support, a Hall induction magnet, and a Hall sensor. After one end of the bracket is fixed to the end cover, the encoder is located between the end cover and the bracket. The other end of the bracket is provided with a relief hole for the Hall signal to pass through. One end of the support is fixed to the other end of the bracket. The Hall induction magnet is fixed to the screw, and the Hall sensor is fixed to the support and corresponds to the Hall induction magnet.
[0008] The utility model fixes the bracket to the end cover of the motor, fixes the encoder to the bracket, adds a support, fixes the support to the bracket, fixes the Hall sensor to the support, fixes the Hall induction magnet to the screw, and makes the Hall sensor correspond to the Hall induction magnet after being fixed to the support. Based on the principle of low cost, through innovative design, the utility model realizes the integrated installation of adding an encoder and a Hall sensor to the SIZE8 fixed-axis linear motor without increasing the mold cost, achieving the closed-loop control function of the motor. Description of the Drawings
[0009] Figure 1 It is a perspective view of a fixed-axis linear motor integrating an encoder and a Hall sensor.
[0010] Figure 2 It is a sectional view of a fixed-axis linear motor integrating an encoder and a Hall sensor.
[0011] Figure 3 It is an exploded view of a fixed-axis linear motor integrating an encoder and a Hall sensor.
[0012] Figure 4 It is a sectional view of the encoder.
[0013] Marks in the drawings:
[0014] Motor body 1, screw 1a, rotor shaft 1b, end cover 1c, main housing 1d, stator 1e, rotor core 1f, bearing 1g, spline sleeve 1h, nut 1i, spline shaft 1j.
[0015] Encoder 2, code disk 2a, fixed seat 2b, housing 2c, photoelectric detection component 2d, boss 2e, buckle 2f, buckling part 2g.
[0016] Bracket 3, relief hole 3a, connecting arm 3b, bridging part 3c.
[0017] Support 4, flange 4a, sleeve 4b, relief opening 4c.
[0018] Hall induction magnet 5, Hall sensor 6, Hall sensor body 6a, snap 6b, sheath 6c, notch 6d. Specific embodiments
[0019] The present utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0020] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by 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. are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation.
[0021] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.
[0022] In the present utility model, unless otherwise clearly defined and limited, the terms "mounted", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0023] In the present utility model, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.
[0024] As Figures 1 to 4 shown, the fixed-axis linear motor integrating an encoder and a Hall sensor of the present utility model includes a fixed-axis linear motor body 1, an encoder 2, a bracket 3, a support 4, a Hall induction magnet 5, and a Hall sensor 6. The following will explain each part and the relationship between each part.
[0025] The fixed-axis linear motor body 1 includes a screw 1a, a rotor shaft 1b, end covers 1c, a main housing 1d, a stator 1e, a rotor core 1f, bearings 1g, a spline sleeve 1h, a nut 1i, and a spline shaft 1j. End covers 1c are fixed to both ends of the main housing 1d, that is, there are two end covers 1c. Bearings 1g are fixed in both end covers 1c. The stator 1e is located inside the main housing 1d and is fixed to the main housing 1d. The rotor core 1f is fixed to the rotor shaft 1b. Both ends of the rotor shaft 1b are connected to the bearings 1g. The rotor shaft 1b is a hollow shaft. One end of the rotor shaft 1b extends into the encoder 2. The encoder 2 is fixed to the first end cover 1c. The nut 1i is located inside the rotor shaft 1b and is fixed to the rotor shaft 1b. The screw 1a passes through the nut 1i and is threadedly connected to the nut 1i. The screw 1a is fixed to the spline shaft 1j. The spline shaft 1j and the spline sleeve 1h are in spline fit. The spline sleeve 1h is fixed to the second end cover 1c.
[0026] The encoder 2 is provided with a through hole for the screw 1a in the fixed-axis linear motor body 1 to pass through. The first part of the encoder 2 is fixed to the rotor shaft 1b of the shaft-type linear motor body 1. The second part of the encoder 2 is fixed to the end cover 1c of the fixed-axis linear motor body 1.
[0027] The first part of the encoder 2 is a code disk 2a. The code disk 2a is sleeved on the rotor shaft 1b and is fixed to the rotor shaft 1b. The second part of the encoder 2 includes a fixed seat 2b, a housing 2c, and a photoelectric detection component 2d. The fixed seat 2b is fixed to the end cover 1c. The fixed seat 2b is fixed to the end cover 1c by screws. The housing 2c is fitted with the fixed seat 2b and is fixed to the fixed seat 2b. The photoelectric detection component 2d is fixed to the housing 2c. The code disk 2a is located inside the housing 2c. The code disk 2a corresponds to the photoelectric detection component 2d. The structure of the photoelectric detection component 2d is prior art and will not be elaborated here.
[0028] Preferably, one end of the fixed seat 2b is provided with a boss 2e, and a buckle 2f is provided on the fixed seat 2b. A buckling portion 2g is provided on the circumferential surface of the housing 2c. The housing 2c is sleeved on the boss 2e, and the buckle 2f is buckled with the buckling portion 2g, so that the fixed seat 2b and the housing 2c are fastened together. The buckle 2f is U-shaped, and the buckling portion 2g is a convex tooth on the circumferential surface of the housing 2c. The surface of the buckling portion 2g is an inclined surface. When the housing 2c is connected to the fixed seat 2b, the buckle 2f slides along this inclined surface, and the buckle 2f is gradually extruded. Finally, the end surface of the buckling portion 2g abuts against the bottom of the groove of the buckle 2f, so that the housing 2c and the fixed seat 2b are fastened together.
[0029] After one end of the bracket 3 is fixed to the end cover 1c, the encoder 2 is located between the end cover 1c and the bracket 3. A relief hole 3a for the Hall signal to pass through is provided at the other end of the bracket 3. One end of the support 4 is fixed to the other end of the bracket 3. The Hall induction magnet 5 is fixed to the screw 1a, and the Hall sensor 6 is fixed to the support 4 and corresponds to the Hall induction magnet 5.
[0030] One end of the screw 1a is provided with a mounting hole. A part of the Hall induction magnet 5 is located in the mounting hole and fixed to the screw 1a. The Hall induction magnet 5 is fixedly bonded to the screw 1a by an adhesive. The Hall induction magnet 5, the relief hole 3a, and the axis of the Hall induction magnet 5 are located on the same straight line.
[0031] The bracket 3 includes connecting arms 3b and a bridging portion 3c. There are at least two connecting arms 3b. One end of each connecting arm 3b is fitted with the side wall surface of the end cover 1c and then fastened to the end cover 1c. The other end of the connecting arm 3b is fixed to the bridging portion 3c. The relief hole 3a is provided on the bridging portion 3c. In this embodiment, the circumferential surface of the first end cover 1c is a plane. The connecting arm 3b is a rectangular body. After the connecting arm 3b is fitted with the circumferential surface of the first end cover 1c, the connecting arm 3b and the end cover 1c are fastened together by screws.
[0032] The support 4 includes a flange 4a and a sleeve 4b. One end of the sleeve 4b is fixed to the flange 4a. The Hall sensor 6 is located in the sleeve 4b and fixed to the sleeve 4b. A relief opening 4c for the signal line in the Hall sensor 6 to pass through is provided on the circumferential surface of the sleeve 4b.
[0033] The Hall sensor 6 includes a Hall sensor body 6a, a snap 6b, and a sheath 6c. One end of the snap 6b is fixed to the Hall sensor body 6a, and the other end of the snap 6b is a free end. The Hall sensor body 6a is inserted into the sheath 6c, and the snap 6b is in close contact with the inner wall of the sheath 6c. The sheath 6c is fixed to the support 4. The sheath 6c and the support 4 are fixed by threaded connection. An internal thread is provided in the sleeve 4b, an external thread is provided on the sheath 6c, and a notch 6d for cooperating with a torque tool is provided on the end face of the sheath 6c. After the torque tool is cooperated with the notch 6d, the torque tool is rotated, so that the sheath 6c and the sleeve 4b are threadedly connected.
Claims
1. A fixed-axis linear motor with an integrated encoder and a Hall sensor, comprising a fixed-axis linear motor body (1), an encoder (2), the encoder (2) being provided with a through hole for a screw (1a) in the fixed-axis linear motor body (1) to pass through, the first part of the encoder (2) being fixed to a rotor shaft (1b) of the fixed-axis linear motor body (1), the second part of the encoder (2) being fixed to an end cover (1c) of the fixed-axis linear motor body (1), characterized in that: The invention also comprises a bracket (3), a support (4), a Hall induction magnet (5), and a Hall sensor (6); after one end of the bracket (3) is fixed to the end cover (1c), the encoder (2) is located between the end cover (1c) and the bracket (3); the other end of the bracket (3) is provided with a clearance hole (3a) for the Hall signal to pass through; one end of the support (4) is fixed to the other end of the bracket (3); the Hall induction magnet (5) is fixed to the screw (1a); and after the Hall sensor (6) is fixed to the support (4), it corresponds to the Hall induction magnet (5).
2. The fixed-axis linear motor with integrated encoder and Hall sensor according to claim 1, characterized in that: One end of the screw rod (1a) is provided with a mounting hole, and a portion of the Hall induction magnet (5) is located in the mounting hole and fixed to the screw rod (1a).
3. The fixed-axis linear motor with integrated encoder and Hall sensor according to claim 1, characterized in that: The first part of the encoder (2) is a code disc (2a), which is sleeved on the rotor shaft (1b) and fixed to the rotor shaft (1b). The second part of the encoder (2) comprises a fixing seat (2b), a shell (2c), and a photoelectric detection component (2d). The fixing seat (2b) is fixed to the end cover (1c), the shell (2c) is matched with the fixing seat (2b) and fixed to the fixing seat (2b), and the photoelectric detection component (2d) is fixed to the shell (2c).
4. The fixed-axis linear motor with integrated encoder and Hall sensor according to claim 3, characterized in that: A boss (2e) is provided at one end of the fixing seat (2b), a buckle (2f) is provided on the fixing seat (2b), a buckle connection portion (2g) is provided on the peripheral surface of the shell (2c), the shell (2c) is sleeved on the boss (2e), the buckle (2f) is buckled with the buckle connection portion (2g), so that the fixing seat (2b) and the shell (2c) are fastened together.
5. The fixed-axis linear motor with integrated encoder and Hall sensor according to claim 1, characterized in that: The bracket (3) comprises a connecting arm (3b) and a bridging portion (3c). There are at least two connecting arms (3b). One end of each connecting arm (3b) is matched with the side wall surface of the end cover (1c) and then fastened to the end cover (1c). The other end of the connecting arm (3b) is fixed to the bridging portion (3c). The clearance hole (3a) is arranged on the bridging portion (3c).
6. The fixed-axis linear motor with integrated encoder and Hall sensor according to claim 1, characterized in that: The support (4) comprises a flange (4a) and a sleeve (4b), one end of the sleeve (4b) is fixed to the flange (4a), the Hall sensor (6) is located in the sleeve (4b) and fixed to the sleeve (4b), and a clearance opening (4c) is provided on the circumference of the sleeve (4b) for the signal line in the Hall sensor (6) to pass through.
7. The fixed-axis linear motor with integrated encoder and Hall sensor according to claim 1, characterized in that: The Hall sensor (6) comprises a Hall sensor body (6a), a spring buckle (6b), and a sheath (6c); one end of the spring buckle (6b) is fixed to the Hall sensor body (6a), and the other end of the spring buckle (6b) is a free end; the Hall sensor body (6a) is inserted into the sheath (6c); the spring buckle (6b) is tightly attached to the inner wall of the sheath (6c); and the sheath (6c) is fixed to the support (4).
8. The fixed-axis linear motor with integrated encoder and Hall sensor according to claim 7, characterized in that: The sleeve (6c) and the support (4) are fixed together by threaded connection, and a notch (6d) for matching with a torque tool is provided on the end surface of the sleeve (6c).