High-axial-bearing direct-drive rotating motor structure applied to servo press

Abstract

The utility model discloses a high-axial-bearing direct-drive rotating motor structure applied to a servo press. The high-axial-bearing direct-drive rotating motor structure comprises a pressure bag, a machine shell and a rear cover. The pressure bag comprises a front cover, a rotor assembly, a band-type brake adapter shaft and a coding adapter shaft; a stator assembly is arranged in the machine shell. A band-type brake and an encoder are arranged in the rear cover; according to the utility model, the rotor assembly adopts the hollow structure design, and an enough space is reserved, so that the screw rod of the transmission system of the press can freely and axially move in the hollow groove to realize direct transmission of power, the problems of assembly clearance, frictional wear and the like caused by the adoption of a matched reduction gear box in the traditional electric servo press are avoided, and the service life of the press is prolonged. And the precision and the service life of the press are further improved. The encoder and the band-type brake are integrated in the rear cover of the non-output end, a more compact integrated structure is achieved, the height size of the whole machine is effectively reduced, the requirement for the height of a plant is lowered, and equipment conveying and future maintenance are facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to a press technical field more specifically, especially relates to a kind of high axial bearing direct drive rotary motor structure applied to servo press. BACKGROUND

[0002] Press, also called press machine, is a kind of mechanical equipment using pressure to process, form, assemble and other operations, which is widely used in many industries. Most of the traditional large-tonnage press machines are designed with hydraulic system, which has the advantages of high power, large output torque, high reliability and stable performance. However, it also has some obvious disadvantages, including low positioning accuracy, slow moving speed, high noise, high energy consumption and difficult maintenance. With the development of servo motor power and control accuracy, servo electric press machine gradually replaces traditional hydraulic press machine in high-end application scenarios with high positioning accuracy and work efficiency requirements. It has the advantages of fast response, low energy consumption, low noise, clean environment, small size and high efficiency.

[0003] However, servo electric press machine still needs further optimization. First, traditional servo motor generally adopts a combination structure of servo motor and reduction gear box to obtain the required instantaneous large torque of the press. The worm and gear structure inside the reduction gear box will have contact clearance due to long-term wear, which will reduce the cumulative superposition accuracy of the press. Second, traditional servo motor generally has a complete structure design, and the stator, rotor and position sensor of the motor are integrated in the motor housing. The output rotating shaft of the servo motor is combined and assembled with the mechanical transmission part. The superposition of the motor axial length and the press transmission system length results in a very high overall height of the press, which requires a very high height for the supporting workshop, and is not conducive to transportation during the process. In addition, the length of the motor rotating shaft and the transmission system such as screw rod after superposition also reduces the radial torque stiffness of the press, which affects the accuracy and service life of the servo electric press. UTILITY MODEL CONTENTS

[0004] The utility model provides a kind of high axial bearing direct drive rotary motor structure applied to servo press to solve the problems raised in the above background technology. To achieve the above purpose, the utility model provides the following technical scheme: a kind of high axial bearing direct drive rotary motor structure applied to servo press, including pressure package, machine shell and back cover;

[0005] The pressure package comprises a front cover, a rotor assembly, a brake clutch adapter shaft and an encoder adapter shaft; the rotor assembly is rotatably connected with the front cover, a hollow slot is formed in the rotor assembly, the hollow slot is open at one end and closed at the other end; the brake clutch adapter shaft is installed at the end of the rotor assembly, and the encoder adapter shaft is installed on the brake clutch adapter shaft;

[0006] The machine shell is provided with a stator assembly matched with the rotor assembly;

[0007] The rear cover is provided with a brake clutch and an encoder, the brake clutch is matched with the brake clutch adapter shaft, and the encoder is installed on the brake clutch and matched with the encoder adapter shaft.

[0008] Preferably, the rotor assembly comprises a hollow shaft, an expansion sleeve and a rotor yoke; the hollow slot is formed in the hollow shaft, the expansion sleeve is arranged on the outer surface of the hollow shaft, and the rotor yoke is connected with the hollow shaft through the expansion sleeve.

[0009] Preferably, a connecting installation slot is arranged on the hollow shaft, a movable nut is connected to the connecting installation slot through a bolt, and a transmission screw rod is connected to the movable nut; the hollow shaft drives the movable nut to rotate, and the transmission screw rod moves along the axial direction with the rotation of the movable nut.

[0010] Preferably, the machine shell comprises an outer shell and an inner shell, the outer shell and the inner shell are welded together; the surface of the inner shell is provided with a spiral water channel, and the inner wall of the inner shell is connected with the stator assembly.

[0011] Preferably, the stator assembly comprises a stator core and a stator winding, the outer diameter of the stator core is 515 mm, the stack thickness is 125 mm, and the stator core is composed of oriented silicon steel without bottom layer with a thickness of 0.35 mm; the stator core is provided with a stator slot, and the stator winding is wound in the stator slot.

[0012] Preferably, a plurality of magnet insertion slots are arranged on the rotor yoke, permanent magnets are arranged in the magnet insertion slots, the permanent magnets are sintered neodymium-iron-boron permanent magnets with a temperature-resistant grade of 42SH or above, and the permanent magnets are bonded with the magnet insertion slots by glue.

[0013] Preferably, the front cover comprises a front end cover, an outer bearing chamber, a thrust aligning roller bearing and a conical roller bearing; the front end cover is used to connect with the machine shell, the outer bearing chamber is connected with the front end cover, the thrust aligning roller bearing is arranged in the front end cover, the conical roller bearing is arranged in the outer bearing chamber, and the rotor assembly is connected with the thrust aligning roller bearing and the conical roller bearing respectively.

[0014] Preferably, the rear cover comprises a rear end cover, a rear shell and a rear cover, the rear end cover is provided with a deep groove ball bearing, the rotor assembly is connected with the deep groove ball bearing; the band brake is mounted on the rear end cover, the end of the band brake is provided with a mounting seat; the encoder is mounted on the mounting seat.

[0015] Preferably, the braking force of the band brake is equal to or greater than 150N·m; the encoder is an optical encoder, and the single circle resolution of the optical encoder is equal to or greater than 24 bits.

[0016] Preferably, the front cover, the rotor assembly, the band brake adapter shaft and the encoder adapter shaft are integrated.

[0017] Compared with the prior art, the beneficial effects of the utility model are that: the rotor assembly of the utility model adopts a hollow structure design, sufficient space is reserved, the lead screw of the press transmission system can freely move axially in the hollow groove, direct transmission of power is realized, assembly virtual position, friction and wear and other problems caused by the use of a matching reduction gear box in traditional electric servo presses are avoided, and the precision and service life of the press are further improved. In addition, since the structure does not involve a reduction gear box, the encoder and the band brake can be integrated in the rear cover of the non-output end, a more compact integrated structure is realized, the height dimension of the whole machine is effectively reduced, the requirement for the height of the factory building is reduced, and the transportation and future maintenance of the equipment are also facilitated. In addition, the utility model also has a spiral water channel in the machine shell, which removes the heat generated by the motor through water cooling or oil cooling, and ensures the reliability and safety of the press in the continuous production process. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a structure diagram of the high axial bearing direct drive rotary motor structure applied to the servo press of the utility model embodiment;

[0019] Figure 2 It is a side view of the high axial bearing direct drive rotary motor structure applied to the servo press of the utility model embodiment;

[0020] Figure 3 It is a side view of the high axial bearing direct drive rotary motor structure applied to the servo press of the utility model embodiment;

[0021] Figure 4 It is a partial exploded view of the high axial bearing direct drive rotary motor structure applied to the servo press of the utility model embodiment;

[0022] Figure 5 It is an exploded view of the high axial bearing direct drive rotary motor structure applied to the servo press of the utility model embodiment;

[0023] In Figures 1 to 5 In which the correspondence between the component names and the figure numbers is:

[0024] 1 - pressure package, 11 - front cover, 111 - front end cover, 112 - outer bearing chamber, 113 - thrust self-aligning roller bearing, 114 - tapered roller bearing, 12 - rotor assembly, 121 - hollow rotating shaft, 1211 - hollow groove, 1212 - connecting mounting groove, 122 - expansion sleeve, 123 - rotor yoke, 13 - brake adapter shaft, 14 - encoder adapter shaft, 2 - housing, 21 - outer shell, 22 - inner shell, 221 - spiral water channel, 3 - rear cover, 31 - rear end cover, 32 - rear shell, 33 - rear cover, 34 - deep groove ball bearing, 4 - stator assembly, 5 - brake, 6 - encoder, 7 - mounting seat. DETAILED DESCRIPTION

[0025] The embodiments of the present application will be further described in detail below with reference to the accompanying drawings and examples, and the accompanying drawings are only used for reference and do not limit the embodiments of the present application. The following examples are used to illustrate the present application, but cannot be used to limit the scope of the present application.

[0026] In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "connected", "connected" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0028] Please refer to Figures 1 to 5 The present application provides a kind of high axial load direct drive rotary motor structure applied to servo press, comprising pressure package 1, housing 2 And rear cover 3;

[0029] The pressure pack 1 comprises a front cover 11, a rotor assembly 12, a brake adapter shaft 13 and an encoder adapter shaft 14; the rotor assembly 12 is rotatably connected with the front cover 11, a hollow groove 1211 is formed in the rotor assembly 12, the hollow groove 1211 is open at one end and closed at the other end; the brake adapter shaft 13 is installed at the end of the rotor assembly 12, and the encoder adapter shaft 14 is installed on the brake adapter shaft 13;

[0030] The stator assembly 4 is arranged in the casing 2 and cooperates with the rotor assembly 12.

[0031] The brake 5 and the encoder 6 are arranged in the rear cover 3, the brake 5 cooperates with the brake adapter shaft 13, and the encoder 6 is installed on the brake 5 and cooperates with the encoder adapter shaft 14.

[0032] The common servo motor of the servo electric press has a complete conventional mechanical structure, including the structure components of the stator, the rotor, the output shaft, the end cover, the shell 21 and the like, and thus has a certain axial length. At the same time, the common servo motor is a common permanent magnet DC motor, and the output torque and the output power thereof are generally difficult to meet the requirements of the electric servo press, and thus the output torque is generally increased through cooperation with a reduction gear box. When the servo motor and the matching reduction gear box of the power source are assembled to the electric press, the output shaft of the servo motor is fixedly connected with the screw rod of the transmission system of the press through a screw, the servo motor provides a rotating torque for the screw rod when rotating, and thus drives the working punch of the press to realize axial displacement and complete the pressing function. Therefore, the total axial length will be very long after the axial lengths of the servo motor and the reduction gear box and the axial length of the transmission system of the press are superposed.

[0033] The structure of the servo motor and the transmission structure of the conventional electric servo press bring obvious limitations to the press. First, the components such as the worm gear inside the gear box itself have a certain virtual gap, and the mechanical wear after use obviously reduces the accuracy of the press, which is very unfavorable for the application of the electric servo press in high-end occasions such as hard alloy and precision ceramics which have very high accuracy requirements. Second, the height of the servo electric press is very high, which requires a very high height of the workshop during operation, and is also very unfavorable for space transportation and transfer inside the workshop, and also causes great inconvenience to future maintenance and repair. Third, the superposed height of the transmission shaft of the servo motor and the transmission screw rod is too large, which causes the axial length of the transmission to be too long, which also reduces the overall stiffness of the press. During operation of the press, the concentricity error of the servo motor output shaft, the transmission screw rod and the mold punch during assembly is easy to produce a certain radial bending moment, which affects the axial positioning accuracy of the press and also reduces the service life of the system.

[0034] The utility model discloses a special integrated direct drive servo motor is designed according to the deficiency of conventional electric servo press, in this embodiment, servo motor is designed as hollow structure's direct drive type servo motor, wherein rotor assembly 12 adopts hollow structure, and the sufficient space is reserved for the screw rod of press, to ensure that the screw rod of transmission system of press can move freely in the hollow groove 1211 of rotor assembly 12 in axial direction, in output end aspect, integrated pressure package 1 structure is adopted, and the front cover 11, rotor assembly 12, clutch shaft 13 and encoder adapter shaft 14 are integrally assembled to form a pressure package 1, and the pressure package 1 is used to interface the transmission system of press, and the structure is more compact, convenient to install, in addition, by fusing transmission system and braking system in the inside of direct drive servo motor, the size in height is greatly reduced, and the requirement of press to workshop height is reduced, and the transportation and future maintenance of equipment are also facilitated, more importantly, the reduction of axial length effectively improves the radial stiffness of traditional system, reduces the radial bending moment caused by assembly precision or powder filling error during pressing, and then improves the overall precision and service life of electric servo press, the direct drive motor is adopted, has the characteristics of high torque density, and the required high torque can be obtained without through the matching reduction gearbox, so the assembly virtual position, friction wear and other problems caused by the matching reduction gear box of traditional electric servo press can be avoided, and the precision and life of press are further improved.

[0035] Since the axial large pressure is required when the press is used in powder metallurgy pressing process, and the servo motor directly provides radial plane rotary torque, therefore, the suitable mechanical structure can stably complete the related torque turning and transmission, and the traditional powder metallurgy bearing, spherical or cylindrical ball bearing cannot simultaneously provide axial and radial rotation, support and positioning functions.

[0036] In addition, the direct drive motor is taken as the power source in this embodiment, and the reduction gear box is not involved, so that the high-precision position sensor and electromagnetic brake braking system can be integrated, and a more compact integrated structure design is obtained, for example, the clutch brake 5 and the encoder 6 are arranged on the rear cover 3.

[0037] The working process of the utility model is as follows: the casing 2 is provided with the stator assembly 4 matched with the rotor assembly 12, the stator assembly 4 generates a magnetic field after electrification, so that the rotor assembly 12 rotates, the hollow groove 1211 of the rotor assembly 12 is connected with the screw rod of the transmission system of the press, and the screw rod is provided with rotary torque, so as to drive the working punch of the press to realize axial displacement, and complete the pressing function.

[0038] Preferably, the rotor assembly 12 comprises a hollow shaft 121, a expansion sleeve 122 and a rotor yoke 123; the hollow slot 1211 is arranged on the hollow shaft 121, the expansion sleeve 122 is arranged on the outer surface of the hollow shaft 121, and the rotor yoke 123 is connected with the hollow shaft 121 through the expansion sleeve 122.

[0039] Preferably, the hollow shaft 121 is provided with a connecting installation slot 1212, the connecting installation slot 1212 is connected with a movable nut through bolts, and the movable nut is connected with a transmission screw rod; the hollow shaft 121 drives the movable nut to rotate, and the transmission screw rod moves along the axial direction with the rotation of the movable nut. In this embodiment, the connecting installation slot 1212 is arranged in the hollow shaft 121 to install the movable nut, so that the movable nut can rotate with the hollow shaft 121. The transmission screw rod penetrates the movable nut and is threadedly connected with the movable nut, and when the hollow shaft rotates, the movable nut rotates synchronously, and then the transmission screw rod generates axial displacement, and finally realizes the function of axial pressing through the punch fixed at the end of the transmission screw rod.

[0040] Further, the hollow shaft 121 is made of 20# low carbon steel by CNC processing.

[0041] Preferably, the machine shell 2 comprises an outer shell 21 and an inner shell 22, and the outer shell 21 and the inner shell 22 are welded; the surface of the inner shell 22 is provided with a spiral water channel 221, and the inner wall of the inner shell 22 is connected with the stator assembly 4. Due to the design of the high-power direct-drive motor, the heat generation of the stator assembly 4 is large, and the traditional air cooling design cannot timely take away the corresponding heat, so it is difficult to ensure that the temperature rise of the direct-drive motor is within a reasonable range. In this embodiment, the water cooling pipeline is arranged on the machine shell 2, specifically, the spiral water channel 221 is arranged on the surface of the inner shell 22, then the circulating cooling water or circulating cooling oil is injected into the spiral water channel 221, and the cooling water or cooling oil flows out after circulating around the stator assembly 4 in the machine shell 2 for several turns, thereby taking away the heat. By adopting the spiral water channel 221 and combining the water cooling or oil cooling mode to take away the heat generated by the direct-drive motor, the reliability and safety of the electric servo press in the continuous production process are ensured.

[0042] Preferably, the stator assembly 4 comprises a stator core and a stator winding, the stator core has an outer diameter of 515 mm and a stack thickness of 125 mm, and is composed of a stack of non-grain-oriented silicon steel sheets with a thickness of 0.35 mm; the stator core is provided with stator slots, and the stator winding is wound in the stator slots. In the embodiment, the stator assembly 4 has an outer diameter of 515 mm and a stack thickness of 125 mm, and is composed of a stack of non-grain-oriented silicon steel sheets with a thickness of 0.35 mm; the stator winding is copper enameled wire wound in the stator slots. Further, in order to ensure the reliability of the motor, the enameled wire with a temperature resistance of 180°C or above is selected.

[0043] Preferably, the rotor yoke 123 is provided with a plurality of magnet insertion slots, the magnet insertion slots are provided with permanent magnets, the permanent magnets are sintered neodymium-iron-boron permanent magnets with a temperature resistance grade of 42SH or above; the permanent magnets and the magnet insertion slots are bonded by glue. In the embodiment, the rotor yoke 123 is processed with magnet insertion slots according to the magnet circuit design requirements, and the permanent magnets are sintered neodymium-iron-boron permanent magnets with a grade of 42SH or above, so as to ensure the high-temperature demagnetization resistance and provide large magnetic flux density; the neodymium-iron-boron permanent magnets are inserted into the insertion slots and then fixed by glue.

[0044] Preferably, the front cover 11 comprises a front end cover 111, an outer bearing chamber 112, a thrust self-aligning roller bearing 113, and a tapered roller bearing 114; the front end cover 111 is used to connect the machine shell 2, the outer bearing chamber 112 is connected with the front end cover 111, the thrust self-aligning roller bearing 113 is arranged in the front end cover 111, the tapered roller bearing 114 is arranged in the outer bearing chamber 112, and the rotor assembly 12 is connected with the thrust self-aligning roller bearing 113 and the tapered roller bearing 114, respectively. In the embodiment, a mixed structure design of one tapered roller bearing 114 and one thrust self-aligning roller bearing 113 is arranged at the output end of the motor, the tapered roller bearing 114 can simultaneously consider radial positioning and large pressure suppression in the axial direction, and the thrust self-aligning roller bearing 113 can effectively reduce the large pressure in the axial direction, thereby avoiding the limitation of matching higher specification bearings in the traditional single bearing design, further making the motor structure more compact and the reliability higher.

[0045] Preferably, the rear cover 3 comprises a rear end cover 31, a rear shell 32, and a rear cover 33, the rear end cover 31 is provided with a deep groove ball bearing 34, and the rotor assembly 12 is connected with the deep groove ball bearing 34; the band-type brake 5 is installed on the rear end cover 31, the band-type brake 5 is provided with a mounting seat 7 at the end, and the encoder 6 is installed on the mounting seat 7.

[0046] Through the above structure, since the screw shaft axial force of the transmission system of the press directly acts on the rotor assembly 12, the motor transmission process at least meets the requirement of being able to withstand 60KN axial force, the motor is provided with three groups of bearings, wherein the outermost end of the output end adopts a tapered roller bearing 114, and a 30240 type tapered roller bearing 114 is preferentially selected to bear the axial thrust caused by the weight of the screw rod, the die holder and the like and maintain the radial positioning; the inner end of the output end adopts a thrust angular ball bearing 113, and a 29336 automatic angular ball bearing is preferentially selected to bear the axial thrust during the operation of the screw rod and maintain the radial positioning; and the non-output end adopts a deep groove ball bearing 34 to maintain the radial positioning and support.

[0047] Preferably, the brake force of the holding brake 5 is equal to or greater than 150N·m; and the encoder 6 is an optical encoder 6, and the single-turn resolution of the optical encoder 6 is equal to or greater than 24 bits. In the embodiment, the already assembled pressure pack 1 is placed in the stator assembly 4, and the encoder 6 for position sensing and the holding brake 5 for preventing the die holder from falling when power is off are installed at the non-output end according to the design, wherein the encoder 6 preferentially selects an optical encoder 6 with a single-turn resolution of 24 bits or above to obtain high-precision motor rotation accuracy; and the holding brake 5 selects a brake with a brake force equal to or greater than 150Nm.

[0048] Preferably, the front cover 11, the rotor assembly 12, the holding brake adapter shaft 13 and the encoder adapter shaft 14 are integrated. In the embodiment, the front cover 11, the rotor assembly 12, the holding brake adapter shaft 13 and the encoder adapter shaft 14 are integrally assembled, and each component is pre-assembled, and then the entire pressure pack 1 is placed in the stator assembly 4 of the housing 2, and is butted against the rear cover 3 to realize rapid installation. Through the integrated design of the pressure pack 1, the overall height of the machine is only 672mm, which is much lower than the 1000mm of the traditional electric servo press structure. In terms of axial positioning accuracy, 0.003mm can be achieved, while the positioning accuracy of the traditional electric servo press can only reach 0.03-0.05mm. In addition, the loaded axial reciprocating life of the embodiment can be higher than 1 million times, which is significantly improved compared with the 500,000 times of the traditional driving structure in terms of service life.

[0049] Compared with the prior art, the rotor assembly of the utility model adopts hollow structure design, reserves enough space, so that the screw rod of the press transmission system can freely move axially in the hollow groove, to realize direct transmission of power, avoid the problems such as assembly virtual position, friction and wear caused by the matched reduction gear box of the traditional electric servo press, further improve the precision and service life of the press.In addition, since the structure does not involve a reduction gear box, the encoder and the band brake can be integrated in the rear cover of the non-output end, realizing a more compact integrated structure, effectively reducing the height size of the whole machine, reducing the requirement for the height of the factory building, and facilitating the transportation and future maintenance of the equipment.In addition, the utility model also has a spiral water channel in the machine shell, which takes away the heat generated by the motor through water cooling or oil cooling, ensuring the reliability and safety of the press in the continuous production process.

[0050] The embodiments of the present application are given for the purpose of illustration and description, and are not exhaustive or limit the present application to the disclosed form. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are chosen and described in order to better illustrate the principles and practical application of the present application, and to enable those of ordinary skill in the art to understand the present application so as to design various embodiments with various modifications suitable for specific purposes.

Claims

1. A high axial load direct drive rotary motor structure applied to a servo press, characterized by, It comprises a pressure package (1), a casing (2) and a back cover (3); The pressure package comprises a front cover (11), a rotor assembly (12), a brake clutch adapter shaft (13) and a encoder adapter shaft (14); the rotor assembly is rotatably connected with the front cover, and a hollow slot (1211) is formed in the rotor assembly; the hollow slot is open at one end and closed at the other end; the brake clutch adapter shaft is installed at the end of the rotor assembly, and the encoder adapter shaft is installed on the brake clutch adapter shaft; The casing is internally provided with a stator assembly (4) matched with the rotor assembly; The back cover is internally provided with a brake clutch brake (5) and an encoder (6); the brake clutch brake is matched with the brake clutch adapter shaft, and the encoder is installed on the brake clutch brake and matched with the encoder adapter shaft.

2. The high axial load direct drive rotary motor structure for a servo press according to claim 1, characterized by, The rotor assembly comprises a hollow shaft (121), an expansion sleeve (122) and a rotor yoke (123); the hollow slot is formed in the hollow shaft, the expansion sleeve is arranged on the outer surface of the hollow shaft, and the rotor yoke is connected with the hollow shaft through the expansion sleeve.

3. The high axial load direct drive rotary motor structure for a servo press according to claim 2, characterized by, A connecting installation slot (1212) is arranged on the hollow shaft, and a movable nut is connected to the connecting installation slot through a bolt; a transmission screw rod is connected to the movable nut; the hollow shaft drives the movable nut to rotate, and the transmission screw rod moves along the axial direction with the rotation of the movable nut.

4. The high axial load direct drive rotary motor structure for a servo press according to claim 1, characterized by The casing comprises an outer shell (21) and an inner shell (22); the outer shell and the inner shell are welded together; a spiral water channel (221) is arranged on the surface of the inner shell, and the inner wall of the inner shell is connected with the stator assembly.

5. The high axial load direct drive rotary motor structure for a servo press according to claim 4, characterized by, The stator assembly comprises a stator core and a stator winding; the outer diameter of the stator core is 515 mm, and the stack thickness is 125 mm; the stator core is composed of oriented silicon steel without bottom layer with a thickness of 0.35 mm; the stator core is provided with a stator slot, and the stator winding is wound in the stator slot.

6. The high axial load direct drive rotary motor structure for a servo press according to claim 2, characterized by A plurality of magnet insertion slots are arranged on the rotor yoke, and permanent magnets are arranged in the magnet insertion slots; the permanent magnets are sintered neodymium-iron-boron permanent magnets with a temperature resistance grade of 42SH or above; the permanent magnets are bonded to the magnet insertion slots by glue.

7. The high axial load direct drive rotary motor structure for a servo press according to claim 1, characterized by, The front cover comprises a front end cover (111), an outer bearing chamber (112), a thrust self-aligning roller bearing (113) and a tapered roller bearing (114); the front end cover is used to connect with the casing, the outer bearing chamber is connected with the front end cover, the thrust self-aligning roller bearing is arranged in the front end cover, the tapered roller bearing is arranged in the outer bearing chamber, and the rotor assembly is connected with the thrust self-aligning roller bearing and the tapered roller bearing respectively.

8. The high axial load direct drive rotary motor structure for a servo press according to claim 7, characterized by, The back cover comprises a back end cover (31), a back shell (32) and a back cover (33); a deep groove ball bearing (34) is arranged on the back end cover, and the rotor assembly is connected with the deep groove ball bearing; the brake clutch brake is installed on the back end cover, and an installation seat (7) is arranged at the end of the brake clutch brake; the encoder is installed on the installation seat.

9. The high axial load direct drive rotary motor structure for a servo press according to claim 8, characterized by, The brake force of the band brake is equal to or greater than 150 N*m; the encoder is an optical encoder, and the single-circle resolution of the optical encoder is equal to or greater than 24 bits.

10. The high axial load direct drive rotary motor structure for a servo press according to any one of claims 1 to 9, characterized by, The front cover, the rotor assembly, the band brake adapter shaft and the encoder adapter shaft are integrated.

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