Shaft driving type linear motor with built-in encoder

Abstract

The utility model discloses a shaft driving type linear motor with a built-in encoder, which belongs to the technical field of linear motors and comprises a magnetic shaft, the magnetic shaft is inserted in a body assembly, the body assembly comprises a motor shell, and two A-phase windings and a B-phase winding are arranged in the motor shell. The first end cover and the second end cover are used for fixing the A-phase winding and the B-phase winding in the motor shell, the second end cover is provided with an encoder, the encoder is used for detecting the position of the magnetic shaft, and the first end cover and the second end cover are connected with a cover plate. And a larger design space is created for the structure of automatic equipment based on the linear motor.

Description

Technical Field

[0001] The utility model relates to the technical field of linear motors, and particularly relates to an axial moving linear motor with an encoder built therein. Background Art

[0002] A linear motor is a device that works based on the principle of electromagnetic induction. Through the coupling between the alternating magnetic field generated by the energized coil and the magnetic field generated by the permanent magnet, relative movement is generated between the primary and secondary of the motor. During the control process of the linear motor, an encoder and a driver are required. The function of the encoder is to detect the movement position of the motor and transmit the data to the driver connected thereto. The driver understands the motor state based on the data feedback of the motor and controls the movement of the motor. Currently, the main types of encoders on the market are magnetic gratings, optical gratings, and Hall encoders. When using the above types of encoders, they generally need to be fixed outside the motor. Magnetic grating and optical grating encoders also require the configuration of magnetic gratings and optical gratings, which not only occupy a large amount of space but also limit the use scenarios. When designing automated equipment using a linear motor, in addition to considering the size and stroke of the motor itself, the installation position of the encoder must also be considered, which increases the difficulty of using the linear motor. Based on the above technical problems, the utility model proposes an axial moving linear motor with an encoder built therein. Summary of the Invention

[0003] For the above technical problems, the technical solution adopted by the utility model is: an axial moving linear motor with an encoder built therein, including a magnetic shaft, the magnetic shaft is inserted inside the body assembly, the body assembly includes a motor housing, two sets of A-phase windings and one set of B-phase windings are arranged inside the motor housing, the winding directions of the A-phase windings and the B-phase windings are opposite, end cover one and end cover two are respectively arranged at both ends of the motor housing, end cover one and end cover two are used to fix the A-phase windings and the B-phase windings inside the motor housing, an encoder is installed on end cover two, and the encoder is used to detect the position of the magnetic shaft.

[0004] Further, a cover plate is connected to end cover one and end cover two.

[0005] Further, both the A-phase windings and the B-phase windings include a plurality of winding coils. The winding coils of the A-phase windings and the B-phase windings are arranged in sequence and inserted on the winding support shaft. The winding directions of adjacent two winding coils are opposite. A spacer is arranged between adjacent two winding coils. A spacer is arranged between the A-phase windings or the B-phase windings and end cover one and end cover two on both sides. Both ends of the winding support shaft are respectively inserted inside end cover one and end cover two.

[0006] Further, resin is poured inside the U-shaped area formed by the motor housing, end cover one, and end cover two.

[0007] Furthermore, one ends of the two sets of A-phase windings and one set of B-phase windings are connected together, and the other ends converge into a power line and are led out from the cover plate. Three-phase alternating current is applied to the A-phase windings and B-phase windings via the power line. An encoder line is connected to the encoder, and the encoder line is led out from the cover plate and connected to the driver.

[0008] Furthermore, the magnetic axis includes a magnetic axis outer sleeve. A plurality of permanent magnets are arranged inside the magnetic axis outer sleeve, and the same magnetic poles of adjacent permanent magnets are installed opposite to each other. Magnetic axis end caps are arranged at both ends of the magnetic axis outer sleeve, and the magnetic axis end caps are used to fix the plurality of permanent magnets inside the magnetic axis outer sleeve.

[0009] Furthermore, two mounting threaded holes are arranged on the surfaces of the first end cap and the second end cap opposite to the cover plate. Pin holes are arranged at positions between the two mounting threaded holes on the first end cap and the second end cap. Corresponding holes are arranged on the motor housing for the pin holes and the mounting threaded holes.

[0010] Furthermore, the winding support shaft is an engineering plastic bearing, and there is a clearance fit relationship between the winding support shaft and the magnetic axis. The winding support shaft is used to provide a guiding function for the magnetic axis.

[0011] The beneficial effects of the present invention compared with the prior art are as follows: The technical solution of the present utility model realizes the miniaturization and integration of the linear motor volume by placing the encoder inside the linear motor, without considering the installation positions of magnetic gratings, optical gratings and encoder heads on the motor, simplifies the use difficulty of the linear motor, and at the same time expands a larger space for the design of automation equipment based on the linear motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the present utility model (first perspective).

[0013] Figure 2 It is a schematic diagram of the internal structure of the present utility model.

[0014] Figure 3 It is a schematic diagram after the main part of the present utility model is cut.

[0015] Figure 4 It is a schematic diagram of the overall structure of the present utility model (second perspective)

[0016] Figure 5 It is a schematic diagram of the internal structure of the magnetic axis of the present utility model.

[0017] Reference Numerals of the Attached Drawings: 1 - magnetic axis; 101 - magnetic axis end cover; 102 - magnet; 103 - outer sleeve of magnetic axis; 2 - first end cover; 3 - motor housing; 4 - power cord; 5 - encoder cable; 6 - cover plate; 7 - phase A winding; 8 - second end cover; 9 - encoder; 10 - phase B winding; 11 - spacer; 12 - winding support shaft; 13 - pin hole; 14 - mounting threaded hole. Detailed Implementation Manner

[0018] Example: As Figures 1 - 5 shown, an axis - driven linear motor with an in - built encoder includes a magnetic axis 1. The magnetic axis 1 is inserted into the interior of the body assembly. The magnetic axis 1 includes a magnetic axis end cover 101, a magnet 102, and an outer sleeve 103 of the magnetic axis. A plurality of magnets 102 are arranged inside the outer sleeve 103 of the magnetic axis, and the same magnetic poles of adjacent magnets 102 are installed opposite to each other. Magnetic axis end covers 101 are provided at both ends of the outer sleeve 103 of the magnetic axis. The magnetic axis end covers 101 are used to fix the plurality of magnets 102 inside the outer sleeve 103 of the magnetic axis. In this embodiment, the fixing method between the outer sleeve 103 of the magnetic axis and the magnetic axis end cover 101 is that a threaded structure is provided on the inner side of the end of the outer sleeve 103 of the magnetic axis, an external thread is provided on the magnetic axis end cover 101, and the magnetic axis end cover 101 and the outer sleeve 103 of the magnetic axis are connected by threads.

[0019] The body assembly includes a motor housing 3. Two sets of phase A windings 7 and one set of phase B windings 10 are arranged inside the motor housing 3. The winding directions of the phase A windings 7 and the phase B windings 10 are opposite. First end covers 2 and second end covers 8 are respectively provided at both ends of the motor housing 3. The first end covers 2 and the second end covers 8 are used to fix the phase A windings 7 and the phase B windings 10 inside the motor housing 3. An encoder 9 is installed on the second end cover 8. The encoder 9 is used to detect the position of the magnetic axis 1. The installation method of the encoder 9 on the second end cover 8 can be fixed on the second end cover 8 by screws or fixed on the second end cover 8 by pasting. A cover plate 6 is connected to the first end covers 2 and the second end covers 8. In this embodiment, threaded holes are provided on the upper surfaces of the first end covers 2 and the second end covers 8, and the cover plate 6 is installed on the first end covers 2 and the second end covers 8 by screws. The working principle of the encoder 9 used in this embodiment is to feedback the movement position of the motor by detecting the magnetic field of the magnetic axis 1.

[0020] Both the phase A windings 7 and the phase B windings 10 include a plurality of winding coils. The winding coils of the phase A windings 7 and the phase B windings 10 are arranged in sequence and penetrated through a winding support shaft 12. The winding directions of adjacent two winding coils are opposite. A spacer 11 is provided between adjacent two winding coils. A spacer 11 is provided between the phase A windings 7 or the phase B windings 10 and the first end covers 2 and the second end covers 8 on both sides. Both ends of the winding support shaft 12 penetrate through the interiors of the first end covers 2 and the second end covers 8 respectively.

[0021] In this embodiment, the winding support shaft 12 is selected as an engineering plastic bearing. There is a clearance fit relationship between the winding support shaft 12 and the magnetic shaft 1. The winding support shaft 12 is used to provide a guiding function for the magnetic shaft 1, so as to ensure that the magnetic shaft 1 can withstand a certain force during movement.

[0022] Resin is cast inside the U-shaped area formed by the motor housing 3, the first end cover 2, and the second end cover 8.

[0023] One ends of two sets of phase-A windings 7 and one set of phase-B winding 10 are connected together, and the other ends converge into a power line 4 which is led out from the cover plate 6. Three-phase alternating current is passed into the phase-A windings 7 and the phase-B winding 10 via the power line 4. An encoder line 5 is connected to the encoder 9, and the encoder line 5 is led out from the cover plate 6. The encoder line 5 is connected to a driver, and the driver is used to receive the position feedback of the magnetic shaft 1 and control the movement of the magnetic shaft.

[0024] Two mounting threaded holes 14 are provided on the surfaces of the first end cover 2 and the second end cover 8 opposite to the cover plate 6. A pin hole 13 is provided at the position between the two mounting threaded holes 14 on the first end cover 2 and the second end cover 8. Corresponding holes are provided on the motor housing 3 for the pin hole 13 and the mounting threaded holes 14. The fixing of the body assembly is realized through the cooperation of the screws and the mounting threaded holes 14, and the positioning of the body assembly is realized through the mounting threaded holes 14.

Claims

1. An encoder-integrated shaft-driven linear motor, characterized in that: It includes a magnetic axis (1) which penetrates inside the body assembly. The body assembly includes a motor housing (3). Inside the motor housing (3), there are two sets of phase-A windings (7) and one set of phase-B winding (10). The winding directions of the phase-A windings (7) and the phase-B winding (10) are opposite. At both ends of the motor housing (3), there are respectively an end cover one (2) and an end cover two (8). The end cover one (2) and the end cover two (8) are used to fix the phase-A windings (7) and the phase-B winding (10) inside the motor housing (3). An encoder (9) is installed on the end cover two (8), and the encoder (9) is used to detect the position of the magnetic axis (1).

2. The shaft-driven linear motor built into an encoder according to claim 1, wherein: A cover plate (6) is connected to the end cover one (2) and the end cover two (8).

3. The axial moving linear motor built in an encoder according to claim 1, wherein: Both the phase-A windings (7) and the phase-B winding (10) include a plurality of winding coils. The winding coils of the phase-A windings (7) and the phase-B winding (10) are arranged in sequence and sleeved on a winding support shaft (12). The winding directions of adjacent two winding coils are opposite. A spacer (11) is arranged between adjacent two winding coils. A spacer (11) is arranged between the phase-A windings (7) or the phase-B winding (10) and the end cover one (2) and the end cover two (8) on both sides. Both ends of the winding support shaft (12) penetrate inside the end cover one (2) and the end cover two (8).

4. The shaft-driven linear motor built into an encoder according to claim 3, wherein: Resin is cast inside the U-shaped area formed by the motor housing (3), the end cover one (2), and the end cover two (8).

5. The axial moving linear motor built in an encoder according to claim 1, wherein: One ends of the two sets of phase-A windings (7) and one set of phase-B winding (10) are connected together, and the other ends converge into a power line (4) which is led out from the cover plate (6). Three-phase alternating current is passed into the phase-A windings (7) and the phase-B winding (10) via the power line (4). An encoder line (5) is connected to the encoder (9), and the encoder line (5) is led out from the cover plate (6). The encoder line (5) is connected to a driver.

6. The shaft-driven linear motor built into an encoder according to claim 1, wherein: The magnetic axis (1) includes a magnetic axis outer sleeve (103). Inside the magnetic axis outer sleeve (103), there are a plurality of magnetic steels (102). The same magnetic poles of adjacent magnetic steels (102) are installed opposite to each other. Magnetic axis end covers (101) are arranged at both ends of the magnetic axis outer sleeve (103), and the magnetic axis end covers (101) are used to fix the plurality of magnetic steels (102) inside the magnetic axis outer sleeve (103).

7. The axial moving linear motor built in the encoder according to claim 1, characterized in that: On the surfaces of the end cover one (2) and the end cover two (8) opposite to the cover plate (6), there are two mounting threaded holes (14). At the positions between the two mounting threaded holes (14) on the end cover one (2) and the end cover two (8), there are pin holes (13). Corresponding holes are arranged on the motor housing (3) for the pin holes (13) and the mounting threaded holes (14).

8. An in-encoder shaft-driven linear motor according to claim 3, characterized in that: The winding support shaft (12) is an engineering plastic bearing. There is a clearance fit relationship between the winding support shaft (12) and the magnetic axis (1). The winding support shaft (12) is used to provide a guiding function for the magnetic axis (1).

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