Double-end permanent magnet closed-loop motor

Abstract

The invention discloses a double-end permanent magnet closed-loop motor, which comprises a casing, a first end cover, a second end cover, a double-end rotating shaft, a rotor iron core and a stator iron core, magnetic steel is arranged on the rotor iron core, a stator winding and a junction box are arranged on the stator iron core, a first via hole for the double-end rotating shaft to pass through is formed in the center of the first end cover, and a second via hole for the double-end rotating shaft to pass through is formed in the center of the second end cover. The outer end face of the first end cover is concaved inwards to form an installation cavity concentric with the first via hole, an encoder is installed in the installation cavity, an outer sealing cover for sealing the encoder is detachably arranged on the first end cover, a stator part of the encoder is pressed and fixed to the first end cover through the outer sealing cover, and a rotor part of the encoder is arranged on the double-end rotating shaft in a sleeving mode and located on the outer side of the bearing. The first end cover is provided with a wiring channel for wiring of a wire harness of the encoder. According to the double-end closed-loop motor, the external space of the end cover is ingeniously and innovatively utilized to install the encoder, the structure is exquisite, the number of parts is greatly reduced, the encoder can be positioned in cooperation with the outer sealing cover, disassembly and assembly are easy and convenient, and the maintenance difficulty is low.

Description

Technical Field

[0001] The present invention relates to the technical field of permanent magnet motors, and particularly to a dual-head permanent magnet closed-loop motor. Background Art

[0002] A motor with an encoder is called a closed-loop motor, while a motor without an encoder is called an open-loop motor. Closed-loop motors have many significant advantages. On the one hand, the encoder can real-time feedback the angle and position of the rotor, enabling the encoder to more accurately capture the magnetic field direction. On this basis, the current during motor operation can reach an optimal state. The encoder transmits the feedback signal to the control system, which then regulates the current in an optimal manner to achieve an energy-saving and efficient operation effect. On the other hand, for the working condition of heavy-load and low-speed startup, the role of the encoder is particularly significant. When operating without load, the current of the closed-loop motor can be maintained at a very low level, and for high-power motors, this difference is more obvious.

[0003] For traditional dual-head motors, due to the structure of the double-ended extension of the rotating shaft, the installation and configuration of the encoder are extremely inconvenient, so they usually do not have an encoder. However, in the current development trend of permanent magnet synchronous servo motors, it has become the mainstream for dual-head motors to be equipped with an encoder to achieve closed-loop control.

[0004] Currently in the market, the vast majority of dual-head motors do not adopt the control method with an encoder. Although the existing patent (CN202889159U) discloses a technical solution for installing an encoder on a single-head motor, the encoder in this solution has the following problems: 1. Its installation process requires the use of two parts, namely an encoder seat and an encoder rotor ring bracket, which not only increases the error risk of tolerance accumulation, but also makes the part management more difficult, and the tolerance accumulation error is likely to cause assembly mistakes. 2. The encoder of this solution is set inside the bearing, which is extremely unfavorable for disassembly and assembly; once the encoder needs to be replaced due to a decrease in accuracy over the years of use, since the bearing forms an interference fit with the shaft by means of hot sleeve, the disassembly process is extremely difficult and often requires the assistance of a puller tool, but this solution does not reserve space for the puller operation, and the entire disassembly and replacement process lacks reasonable consideration.

[0005] In summary, the existing dual-head motors mostly do not achieve closed-loop control due to the inconvenient installation of the encoder, and the existing technical solutions for installing an encoder on a single-head motor have many defects. Therefore, it is necessary to continue to research and develop an encoder installation method suitable for dual-head permanent magnet motors to achieve efficient and convenient closed-loop control. Summary of the Invention

[0006] In view of the above deficiencies of the prior art, the purpose of the present invention is to provide a dual-head permanent magnet closed-loop motor that is convenient for disassembly and assembly.

[0007] To achieve the above purpose, the present invention adopts the following technical solutions:

[0008] A double - headed permanent - magnet closed - loop motor includes a machine housing, a first end cover arranged at one end of the machine housing, a second end cover arranged at the other end of the machine housing, a double - headed rotating shaft that extends outwards through the first end cover and the second end cover at both ends to form a transmission end and is rotatably connected to the first end cover and the second end cover through bearings, a rotor core arranged on the double - headed rotating shaft, and a stator core arranged between the rotor core and the machine housing. There are magnetic steel on the rotor core, a stator winding and a junction box arranged on the machine housing. A first through - hole for the double - headed rotating shaft to pass through is formed in the center of the first end cover. The outer end face of the first end cover is recessed inwards to form an installation cavity concentric with the first through - hole. An encoder is installed in the installation cavity. An outer cover for sealing the encoder is detachably arranged on the first end cover. The outer cover presses the stator part of the encoder on the first end cover. The rotor part of the encoder is sleeved on the double - headed rotating shaft and is located outside the bearing. A wiring channel for the wiring harness of the encoder is arranged on the first end cover.

[0009] As a further improvement of the above - mentioned technical solution, the junction box is arranged on the top of the machine housing. A first wiring perforation is opened on the top of the machine housing, and a second wiring perforation aligned with the first wiring perforation is opened at the bottom of the junction box.

[0010] As a further improvement of the above - mentioned technical solution, the wiring channel includes a first wiring groove opened on the top of the installation cavity and a wiring inclined hole penetrating through the inner and outer sides of the first end cover. The wiring harness of the encoder is embedded in the first wiring groove and then extends into the machine housing along the wiring inclined hole, and then is wired to the junction box along the first wiring perforation and the second wiring perforation.

[0011] As a further improvement of the above - mentioned technical solution, a rabbet for pressing the stator part of the encoder is arranged on the back surface of the outer cover, and a second wiring groove aligned with the first wiring groove is opened.

[0012] As a further improvement of the above - mentioned technical solution, a positioning flange for installing a sealing ring is recessed inwards at the center of the outer cover, and the positioning flange is in a C - shape.

[0013] As a further improvement of the above - mentioned technical solution, a plurality of installation holes are opened on the outer cover, and the same number of threaded holes corresponding one - to - one are opened on the first end cover. A screw cooperating with the corresponding threaded hole is arranged at each installation hole.

[0014] As a further improvement of the above - mentioned technical solution, the encoder is a magnetoresistive resolver.

[0015] As a further improvement of the above - mentioned technical solution, the rotor part of the magnetoresistive resolver is connected to the double - headed rotating shaft by a key - connection method, and an axial retaining ring for axially positioning the rotor part of the magnetoresistive resolver is arranged on the double - headed rotating shaft.

[0016] Advantages of the present invention: The double-headed closed-loop motor provided by the present invention ingeniously and innovatively utilizes the external space of the end cover to install the encoder. It has a delicate structure, greatly reducing the number of parts. Together with the outer cover, the encoder can be positioned. The outer cover also effectively blocks external objects from directly contacting the encoder, avoiding damage to the encoder due to collision, and greatly reducing the entry of dust and debris into the encoder, ensuring the accuracy and reliability of the encoder. Since the rotor part of the encoder is located outside the bearing, when the accuracy of the encoder decreases due to long-term use and needs to be replaced, it is not necessary to disassemble the interference-fitted bearing. By removing the outer cover, the encoder can be replaced, greatly simplifying the disassembly and assembly process, reducing the maintenance difficulty, and improving the maintenance efficiency. In addition, a wire routing channel is specifically provided on the first end cover, enabling the wire harness of the encoder to have a dedicated wire routing space, making the wiring more regular, avoiding potential safety hazards and signal interference problems caused by messy wire harnesses, and contributing to improving the overall performance and stability of the motor. Description of the Drawings

[0017] Figure 1 It is a perspective view of the double-headed permanent magnet closed-loop motor provided by the present invention.

[0018] Figure 2 It is a perspective view of the double-headed permanent magnet closed-loop motor provided by the present invention after removing the outer cover, and the wire harness of the encoder is not shown.

[0019] Figure 3 It is a schematic diagram of an encoder embodiment.

[0020] Figure 4 It is a cross-sectional view of the double-headed permanent magnet closed-loop motor provided by the present invention, and the wire harness of the encoder is not shown.

[0021] Figure 5 It is Figure 4 A partial enlarged view of the L area in

[0022] Figure 6 It is a perspective view of the first end cover.

[0023] Figure 7 It is a perspective Figure 1 .

[0024] Figure 8 It is a perspective Figure 2 .

[0025] Description of main component symbols: 1 - housing, 11 - first wiring through-hole, 21 - first end cover, 211 - first through-hole, 212 - installation cavity, 213 - wiring channel, 2131 - first wiring groove, 2132 - wiring inclined hole, 214 - threaded hole, 215 - screw, 216 - wiring area, 22 - second end cover, 3 - double-headed rotating shaft, 41 - rotor core, 42 - stator core, 43 - permanent magnet, 44 - stator winding, 46 - bearing, 5 - junction box, 51 - second wiring through-hole, 6 - encoder, 61 - stator part, 62 - rotor part, 63 - wire harness, 7 - outer cover, 71 - rabbet, 72 - second wiring groove, 73 - positioning flange, 74 - mounting hole, 75 - second through-hole, 81 - shaft retaining ring, 9 - sealing ring. Detailed implementation manners

[0026] The present invention provides a double-headed permanent magnet closed-loop motor. To make the objectives, technical solutions and effects of the present invention clearer and more definite, the following further describes the present invention in detail with reference to the accompanying drawings and by way of examples. It should be understood that the specific examples described herein are only used to explain the present invention and are not used to limit the protection scope of the present invention.

[0027] Please refer to Figures 1 to 8 , the present invention provides a double-headed permanent magnet closed-loop motor, including a housing 1, a first end cover 21 provided at one end of the housing 1, a second end cover 22 provided at the other end of the housing 1, a double-headed rotating shaft 3 that extends outwards through the first end cover 21 and the second end cover 22 at both ends to form a transmission end and is rotatably connected to the first end cover 21 and the second end cover 22 through bearings 46, a rotor core 41 provided on the double-headed rotating shaft 3, and a stator core 42 provided between the rotor core 41 and the housing 1. A permanent magnet 43 is provided on the rotor core 41, a stator winding 44 is provided on the stator core 42, and a junction box 5 is provided on the housing 1. A first through-hole 211 for the double-headed rotating shaft 3 to pass through is formed in the center of the first end cover 21, and an installation cavity 212 concentric with the first through-hole 211 is recessed inward from the outer end surface of the first end cover 21. An encoder 6 is installed in the installation cavity 212. It can be understood that the encoder 6 is located outside the first end cover 21 and does not affect the internal structural layout of the motor. An outer cover 7 for covering and sealing the encoder 6 is detachably provided on the first end cover 21. The outer cover 7 presses the stator part 61 of the encoder 6 against the first end cover 21. The rotor part 62 of the encoder 6 is sleeved on the double-headed rotating shaft 3 and is located outside the bearing 46. A wiring channel 213 for the wire harness 63 of the encoder 6 to route is provided on the first end cover 21. It can be understood that both ends of the double-headed rotating shaft 3 are transmission ends and can be connected to other devices by key connection.

[0028] When the double-headed permanent magnet closed-loop motor is working, the current is transmitted to the stator winding 44 through the junction box 5, and the stator winding 44 generates a rotating magnetic field after being energized. Under the action of the rotating magnetic field, the magnetic steel 43 on the rotor core 41 drives the double-headed shaft 3 to rotate, realizes the conversion of electrical energy into mechanical energy, and outputs power to the outside through the transmission end of the double-headed shaft 3. At the same time, the encoder 6 located in the mounting cavity 212 of the first end cover 21 starts to work. The rotor part 62 of the encoder 6 is mounted on the double-headed shaft 3. As the shaft rotates synchronously, its stator part 61 is pressed on the first end cover 21 by the outer cover 7 to remain stationary. In this way, the encoder 6 can detect the rotation of the rotor in real time, and transmit the angle and position information of the rotor in the form of electrical signals through the wiring harness 63 along the wiring channel 213 on the first end cover 21 to the control system. The control system accurately regulates the current according to the signal fed back by the encoder 6, so that the current of the motor is in the optimal state when it is running, and achieves efficient operation.

[0029] The double-headed closed-loop motor provided by the present invention cleverly and innovatively utilizes the external space of the end cover to install the encoder 6. It has a sophisticated structure and greatly reduces the number of parts. The encoder 6 can be positioned in conjunction with the outer cover 7. The outer cover 7 also effectively prevents external objects from directly contacting the encoder 6, preventing the encoder 6 from being damaged due to collision, and greatly reduces dust and debris from entering the encoder 6, thereby ensuring the accuracy and reliability of the encoder 6. Since the rotor portion 62 of the encoder 6 is located outside the bearing 46, when the encoder 6 needs to be replaced due to the increase in the service life and the decrease in accuracy, there is no need to disassemble the interference-fitting bearing 46. The encoder 6 can be replaced by disassembling the outer cover 7, which greatly simplifies the disassembly and assembly process, reduces the difficulty of maintenance, and improves the maintenance efficiency. In addition, a wiring channel 213 is specially set on the first end cover 21, so that the wiring harness 63 of the encoder 6 has a special wiring space, the wiring is more regular, and the safety hazards and signal interference problems caused by the disorder of the wiring harness 63 are avoided, which helps to improve the overall performance and stability of the motor.

[0030] Specifically, the junction box 5 is arranged at the top of the housing 1, and a first wiring through-hole 11 is provided at the top of the housing 1, and a second wiring through-hole 51 is provided at the bottom of the junction box 5 and aligned with the first wiring through-hole 11. During installation, the cable can directly pass through the first wiring through-hole 11 from the inside of the housing 1, and then seamlessly connect to the second wiring through-hole 51 at the bottom of the junction box 5, which reduces the bending and detour of the cable during the transfer process, reduces the wiring difficulty, and improves the installation efficiency. Compared with setting the junction box 5 at the bottom of the motor or other positions that occupy a large bottom space, setting the junction box 5 at the top can effectively save the bottom space of the motor.

[0031] Specifically, the wiring channel 213 includes a first wiring groove 2131 formed at the top of the installation cavity 212 and a wiring inclined hole 2132 penetrating through the inner and outer sides of the first end cover 21. The wire harness 63 of the encoder 6 is embedded in the first wiring groove 2131 and then extends into the machine housing 1 along the wiring inclined hole 2132, and is then wired to the junction box 5 along the first wiring through-hole 11 and the second wiring through-hole 51, which defines a clear wiring path for the wire harness 63 of the encoder 6. The design of the wiring groove and the wiring inclined hole 2132 makes full use of the space of the first end cover 21 and the machine housing 1, reasonably guides the wire harness 63 in the limited space, avoids the wire harness 63 occupying too much unnecessary space, makes the internal space layout of the motor more compact and reasonable, and improves the space utilization rate.

[0032] Further, a stop 71 for pressing the stator portion 61 of the encoder 6 is provided on the back surface of the outer cover 7, and a second wiring groove 72 aligned with the first wiring groove 2131 is provided. The circumferential position of the stator portion 61 of the encoder 6 is mainly determined according to the wiring position of the wire harness 63 of the encoder 6. When the stop 71 is tightly pressed against the stator portion 61 of the encoder 6, it not only ensures that the encoder 6 will not be displaced due to vibration during the operation of the motor, guarantees the accuracy and stability of the measurement of the encoder 6, but also avoids the wear of internal components caused by the shaking of the encoder 6, and extends the service life of the encoder 6. In addition, the first wiring groove 2131 and the second wiring groove 72 combine to form a larger wiring area 216, providing sufficient space for the wire harness 63 of the encoder 6. When the wire harness 63 is arranged therein, it will not be squeezed or bent excessively due to cramped space. This can not only effectively protect the insulation layer of the wire harness 63, prevent electrical faults such as short circuits caused by extrusion damage, but also ensure the stable physical performance of the wires in the wire harness 63 and guarantee the accuracy of signal transmission. The spacious wiring area 216 provides more ample operating space for the installer. When arranging the wire harness 63 of the encoder 6 into the wiring groove, it is easier to operate, without having to be cautious to avoid the wire harness 63 from being entangled with each other or being difficult to place due to too small space. This greatly improves the installation efficiency and reduces the risk of damage to the wire harness 63 that may be caused by inconvenient operation during the installation process.

[0033] Furthermore, a second through-hole 75 is formed at the center of the outer cover 7, and a positioning flange 73 for installing the sealing ring 9 is formed by inward depression around the second through-hole 75, and the positioning flange 73 is in a C shape. The C-shaped positioning flange 73 provides an accurate installation position for the sealing ring 9. The sealing ring 9 can specifically be a lip-shaped sealing ring 9, ensuring that the sealing ring 9 can be accurately installed at the center of the outer cover 7 and accurately docked with the part to be sealed. This effectively avoids the offset or misalignment during the installation of the sealing ring 9, guarantees the effectiveness of the seal, and can better prevent impurities such as dust and water vapor from entering the motor interior, playing a protective role for the encoder 6 and other key components.

[0034] Preferably, a plurality of mounting holes 74 are formed in the outer cover 7, and threaded holes 214 with the same number and in one-to-one correspondence with the mounting holes 74 are formed in the first end cover 21. A screw 215 adapted to the corresponding threaded hole 214 is provided at each mounting hole 74. The fastening effect of the plurality of screws 215 enhances the overall structural strength of the connection between the outer cover 7 and the first end cover 21; during the operation of the motor, whether it is vibration, impact or other external forces, this uniform force distribution can effectively avoid local stress concentration and ensure that the outer cover 7 is always tightly fixed on the first end cover 21, guaranteeing a stable operating environment for the encoder 6.

[0035] In this embodiment, the encoder 6 is a reluctance type resolver. The reluctance type resolver has a relatively simple structure and a small volume, which is convenient for installation in the limited space of the dual-head permanent magnet closed-loop motor. Moreover, there are no complex mechanical transmission components inside it, reducing the risk of failures caused by mechanical wear, and lowering the maintenance cost and difficulty. Throughout the life cycle of the motor, users can enjoy lower maintenance costs and higher operating efficiency.

[0036] The reluctance type resolver utilizes the principle of electromagnetic induction and can accurately measure the position and angle of the rotor. During the operation of the motor, it can feedback the rotor position information to the control system in the form of high-precision electrical signals. This precise feedback is crucial for the precise control of the motor, enabling the control system to accurately adjust the current of the stator winding 44 according to the actual position of the rotor, ensuring the best matching between the motor magnetic field and the rotor magnetic field, and thus realizing the efficient and stable operation of the motor. In addition, the reluctance type resolver also has the advantages of strong anti-interference ability and adaptability to harsh environments. Due to its simple and robust structure, the reluctance type resolver can work reliably under relatively harsh environmental conditions. Whether it is a high-temperature, humid or dusty environment, it will not have a significant impact on its performance. This enables the dual-head permanent magnet closed-loop motor using the reluctance type resolver to be widely applied to various industrial environments, such as the metallurgy and mining industries, reducing the failures of the encoder 6 caused by environmental factors and improving the service life and reliability of the motor.

[0037] Further, the rotor part 62 of the reluctance resolver is connected to the double-headed rotating shaft 3 by a key connection method, which can ensure reliable torque transmission between the rotor part 62 of the reluctance resolver and the double-headed rotating shaft 3. During the operation of the motor, the rotational power of the double-headed rotating shaft 3 can be accurately and stably transmitted to the rotor part 62 of the reluctance resolver through the key, enabling the two to rotate synchronously, thereby ensuring that the reluctance resolver can accurately measure the position and speed information of the rotor. This synchronous rotation is the key to achieving precise control of the motor, avoiding measurement errors and control failures caused by loose connections or slipping. An axial retaining ring 81 for positioning the rotor part 62 of the reluctance resolver is provided on the double-headed rotating shaft 3. The axial retaining ring 81 can ensure the stable axial position of the rotor part 62 on the double-headed rotating shaft 3. During the operation of the motor, it avoids the axial movement of the rotor part 62, ensures that the relative position relationship between the reluctance resolver and the double-headed rotating shaft 3 remains unchanged, so as to prevent axial movement from causing measurement errors and affecting the closed-loop control accuracy of the motor. It can also prevent the rotor part 62 from colliding or rubbing against other components due to axial movement, avoiding damage to the components.

[0038] In summary, the process of disassembling the encoder 6 is as follows: First, remove the outer cover 7 from the first end cover 21 by unscrewing the screws 215 at the mounting holes 74 on the outer cover 7. These screws 215 cooperate with the corresponding threaded holes 214 on the first end cover 21. After removal, the outer cover 7 can be taken off, thus exposing the reluctance resolver. Then, disconnect the wiring harness 63 connection of the reluctance resolver. Since the rotor part 62 of the reluctance resolver is connected to the double-headed rotating shaft 3 by a key connection method and axially positioned by the axial retaining ring 81, the axial retaining ring 81 needs to be removed first, which can be operated using a special tool (such as a snap ring pliers). After removing the retaining ring, use a suitable tool to move the rotor part 62 along the direction of the key out of the double-headed rotating shaft 3, thereby completing the disassembly of the rotor part 62. Finally, take out the stator part 61 of the reluctance resolver from the mounting cavity 212 of the first end cover 21. Since the stator part 61 was previously pressed by the stop 71 of the outer cover 7, after the outer cover 7 is removed, the stator part 61 is relatively easy to take out, but still needs to be carefully operated to avoid damaging the mounting cavity 212 or the stator part 61 itself.

[0039] The process of installing the encoder 6 is as follows: first, place the stator part 61 of the reluctance rotary transformer in the installation cavity 212 of the first end cover 21 to ensure that its installation position is accurate. At this time, attention should be paid to the matching of the stator part 61 and the installation cavity 212 and the relative position relationship between the wiring harness 63 of the reluctance rotary transformer and the wiring channel 213. The rotor part 62 of the reluctance rotary transformer is mounted on the double-headed shaft 3 by key connection, ensuring that the key and the keyway are accurately matched to ensure the effective transmission of torque. Then the shaft retaining ring 81 is used to axially position the rotor part 62 so that the axial position of the rotor part 62 on the double-headed shaft 3 is stable to prevent it from moving. The wiring harness 63 is connected according to the correct wiring channel 213, generally first embedded in the first wiring groove 2131 at the top of the installation cavity 212 of the first end cover 21, and then extended into the housing 1 along the wiring inclined hole 2132, and then connected to the wiring box 5 along the first wiring through hole 11 and the second wiring through hole 51 at the bottom of the wiring box 5 to ensure that the electrical connection is correct and firm. Finally, align the second wiring groove 72 of the outer cover 7 with the first wiring groove 2131, and then align the mounting hole 74 with the threaded hole 214 on the first end cover 21, and fix it with the screw 215. After the outer cover 7 is installed, the stopper 71 on the back side will press the stator part 61 of the reluctance rotary transformer to further fix the encoder 6. Finally, install the sealing ring 9 on the positioning flange 73 so that the sealing ring 9 can effectively seal and prevent dust, water vapor, etc. from entering the motor.

[0040] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0041] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] It is understandable that those of ordinary skill in the art can make equivalent substitutions or modifications based on the technical solution of the present invention and its inventive concept, and all such modifications or substitutions should fall within the protection scope of the present invention.

Claims

1. A double-headed permanent magnet closed-loop motor, comprising a casing, a first end cover arranged at one end of the casing, a second end cover arranged at the other end of the casing, a double-headed rotating shaft with two ends extending outwardly through the first end cover and the second end cover to form a transmission end and rotatably connected to the first end cover and the second end cover through a bearing, a rotor core arranged on the double-headed rotating shaft, and a stator core arranged between the rotor core and the casing, wherein the rotor core is provided with a magnetic steel, the stator core is provided with a stator winding, and a terminal box arranged on the casing, characterized in that: A first through hole is formed at the center of the first end cover for the double-headed rotating shaft to pass through, and the outer end surface of the first end cover is recessed inward to form a mounting cavity concentric with the first through hole, an encoder is installed in the mounting cavity, and an outer cover for covering the encoder is detachably provided on the first end cover, and the outer cover presses the stator part of the encoder onto the first end cover, and the rotor part of the encoder is mounted on the double-headed rotating shaft and is located on the outside of the bearing, and a wiring channel for routing the wiring harness of the encoder is provided on the first end cover.

2. The double-headed permanent magnet closed-loop motor according to claim 1, characterized in that: The junction box is arranged on the top of the casing, a first wiring through-hole is provided on the top of the casing, and a second wiring through-hole aligned with the first wiring through-hole is provided on the bottom of the junction box.

3. The double-headed permanent magnet closed-loop motor according to claim 2, characterized in that: The wiring channel includes a first wiring groove opened on the top of the installation cavity and a wiring oblique hole passing through the inner and outer sides of the first end cover. After the wiring harness of the encoder is embedded in the first wiring groove, it extends into the casing along the wiring oblique hole, and then is connected to the wiring box along the first wiring through hole and the second wiring through hole.

4. The double-headed permanent magnet closed-loop motor according to claim 3, characterized in that: A stop for pressing the stator portion of the encoder is provided on the back side of the outer cover, and a second wiring groove aligned with the first wiring groove is opened.

5. The double-headed permanent magnet closed-loop motor according to claim 4, characterized in that: A second through hole is formed at the center of the outer cover, and the periphery of the second through hole is recessed inward to form a positioning flange for installing the sealing ring, and the positioning flange is C-shaped.

6. The double-headed permanent magnet closed-loop motor according to claim 1, characterized in that: The outer cover is provided with a plurality of mounting holes, the first end cover is provided with threaded holes which are the same in number and correspond one to one with the mounting holes, and each mounting hole is provided with a screw which matches with the corresponding threaded hole.

7. The double-headed permanent magnet closed-loop motor according to claim 1, characterized in that: The encoder is a reluctance rotary transformer.

8. The double-headed permanent magnet closed-loop motor according to claim 7, characterized in that: The rotor part of the reluctance rotary transformer is connected to the double-headed rotating shaft by a key connection, and the double-headed rotating shaft is provided with a shaft retaining ring for axially positioning the rotor part of the reluctance rotary transformer.

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