Direct-drive type rotation driving device with adjustable axial clearance of motor rotor

Abstract

The utility model discloses a direct-drive type rotary driving device with an adjustable axial clearance of a motor rotor. The direct-drive type rotary driving device comprises a torque motor, a casing and a first rotary supporting piece, the torque motor comprises a rotor assembly and a stator assembly. The rotor assembly comprises a rotor yoke, an adjusting shaft and an adjusting flange. The adjusting flange is in threaded connection with the adjusting shaft; the adjusting shaft is rotationally connected with the machine shell through a first rotating supporting piece. By rotating the adjusting flange, axial pre-tightening adjustment of the first rotating supporting piece can be achieved. Compared with the prior art, direct driving is realized by utilizing the torque motor, so that the problems of gaps, resonance and positioning errors caused by introduction of a middle assembly are eliminated, the axial positions of the first rotating support piece and the rotor assembly can be finely adjusted, the problem of movement is effectively solved, and the service life of the motor is prolonged. The problem of vibration of the radar rotary table caused by movement is avoided, and the precision of radar data acquisition is further improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to motor technical field especially relates to a motor rotor axial gap adjustable direct drive type rotary drive device. BACKGROUND

[0002] Radar as an important electronic equipment, in aerospace, meteorological monitoring, traffic control and many other fields play a key role. Its basic working principle is through emitting electromagnetic wave and receiving the echo of target reflection to detect the position, speed, size and other information of target. Radar antenna is a relatively independent and special part, in addition to the control part, other is characterized by large piece, the intuitive performance is heavy, small maintenance operation space, inconvenient maintenance etc. In order to realize the effective detection of different directions, different distance targets, radar antenna usually needs to have rotating function, so as to be able to cover larger monitoring range. In order to realize the rotation of radar antenna, radar antenna is installed on radar turntable, and is connected with radar turntable by rotary drive device to drive radar turntable to rotate with radar antenna.

[0003] In prior art, rotary drive device is the structure of traditional motor and speed reduction mechanism combination. This mode uses ordinary induction motor or stepper motor, reduces motor rotating speed and increases torque through gear box, belt drive or chain drive and other speed reduction devices, to meet the low speed and large torque requirement of radar rotation.

[0004] The deficiency of prior art is that: speed reduction mechanism will produce larger noise and vibration in the running process, which affects the stability and reliability of radar, such as driving gap, component vibration when driving radar turntable to rotate, which will affect the accuracy of radar data acquisition. In addition, the axial position of the rotary force output shaft of the existing motor is not adjustable, and the long-term use will easily cause the problem of axial movement, and the axial movement will also cause the problem of radar turntable vibration, which affects the accuracy of radar data acquisition.

[0005] Therefore, it is necessary to provide a new motor rotor axial gap adjustable direct drive type rotary drive device to solve the above technical problems. SUMMARY

[0006] (1) technical problems to be solved

[0007] Based on this, the utility model provides a kind of motor rotor axial gap adjustable direct drive type rotary drive device, to solve the technical problems that the stability and reliability of radar are influenced by driving gap, vibration etc. in the mode that existing motor speed increasing and speed reducing mechanism drives radar to rotate.

[0008] (2) technical scheme

[0009] To solve the above technical problems, the utility model provides a motor rotor axial gap adjustable direct drive type rotary drive device, include: torque motor, casing and first rotation support piece, torque motor includes rotor assembly and the stator assembly of setting in the outside of rotor assembly, rotor assembly and stator assembly rotation links, casing is equipped with stator installation cavity in, stator assembly fixedly embedded in stator installation cavity, rotor assembly includes coaxial arrangement rotor yoke, adjustment shaft and adjustment flange, adjustment flange is located in the one end outside of casing, adjustment shaft passes through rotor yoke and is fixedly connected with rotor yoke, the one end of adjustment shaft is screw joint end, screw joint end stretches into adjustment flange, and adjustment flange is connected with adjustment shaft threadedly, first rotation support piece sets up in the outside of adjustment shaft, and first rotation support piece is located in the space of rotor yoke, adjustment flange, adjustment shaft and casing four, adjustment shaft is connected with casing rotation through first rotation support piece, adjustment flange includes the pre-tightening pressure convex ring of setting opposite first rotation support piece, rotates adjustment flange, can drive pre-tightening pressure convex ring close to or away from first rotation support piece, to realize the axial pre-tightening adjustment of first rotation support piece.

[0010] Preferably, the motor rotor axial gap adjustable direct drive type rotary drive device further comprises a rear end cover and a second rotation support piece, the rear end cover covers the slot of the stator installation cavity, the rear end cover is fixedly connected with the casing, and the rear end cover also abuts against the side of the stator assembly away from the adjustment flange; the second rotation support piece is sleeved outside the adjustment shaft, and the second rotation support piece is located in the space surrounded by the rotor yoke, the rear end cover, and the adjustment shaft; the adjustment shaft is also connected with the casing in rotation through the second rotation support piece; and the first rotation support piece and the second rotation support piece are symmetrically arranged on both sides of the rotor yoke.

[0011] Preferably, the first rotating support is a first bearing, the first bearing comprising a first bearing inner ring and a first bearing outer ring; the second rotating support is a second bearing, the second bearing comprising a second bearing inner ring and a second bearing outer ring; the machine shell further comprises a recessed first bearing chamber, the first bearing chamber being located at one side of the stator mounting cavity, the rear end cover further comprises a recessed second bearing chamber, the first bearing being accommodated in the first bearing chamber, the second bearing being accommodated in the second bearing chamber, the first bearing inner ring and the second bearing inner ring being respectively arranged outside the adjusting shaft, the pre-tightening abutting protruding ring being arranged opposite to the first bearing inner ring; the adjusting shaft further comprises a protruding bearing limiting ring, the second bearing inner ring being abutted against the bearing limiting ring away from the adjusting flange; the first limiting pre-tightening ring and the second limiting pre-tightening ring are respectively movably sleeved outside the adjusting shaft.

[0012] Preferably, the machine shell further comprises an end cover mounting step groove, the end cover mounting step groove being located at the other side of the stator mounting cavity; the rear end cover comprises a coaxially arranged end cover body and an adjusting ring, the second bearing chamber being arranged on the end cover body, the end cover body being mounted in the end cover mounting step groove, the end cover body being provided with a recessed sliding groove at the side close to the end cover mounting step groove, the adjusting ring being slidably connected in the sliding groove, the end cover body being provided with an adjusting screw hole penetrating through the end cover body and arranged opposite to the adjusting ring, the adjusting screw hole being provided with an adjusting screw for adjusting the distance between the adjusting ring and the bottom of the sliding groove, the two side surfaces of the adjusting ring being respectively abutted against the stator assembly and the adjusting screw.

[0013] Preferably, the end cover body is provided with an end cover mounting hole penetrating through the end cover body and arranged opposite to the bottom of the end cover mounting step groove, the motor rotor shaft axial gap adjustable direct drive type rotary drive device further comprising an end cover connecting screw penetrating through the end cover mounting hole and extending into the machine shell, the end cover connecting screw being used for fixing the end cover body in the machine shell.

[0014] Preferably, the machine shell is a cylindrical shell as a whole, the rotor assembly being coaxially arranged with the machine shell; the outer side wall of the stator assembly and the inner side wall of the stator mounting cavity are fixed by an adhesive.

[0015] Preferably, the motor rotor axial gap adjustable direct drive rotary drive device further comprises a detection member for detecting the action parameter of the rotor assembly, the detection member is fixed to the side of the rear end cover away from the stator mounting cavity; the detection member comprises a detection lead-out wire; the torque motor comprises a motor lead-out wire; the outer wall of the end cover body is provided with a recessed wire through channel, the wire through channel communicates the inside of the casing and the outside space of the casing, and the detection lead-out wire and the motor lead-out wire both penetrate through the wire through channel and extend out of the casing.

[0016] Preferably, the stator assembly comprises a stator core and a stator winding, the stator winding is nested in the stator core; the rotor assembly further comprises a magnetic steel fixedly sleeved on the outside of the rotor yoke or in the rotor yoke; the stator mounting cavity is overall circular stepped, the stator mounting cavity is provided with a stator limiting step, and the two sides of the stator core abut against the stator limiting step and the adjusting ring respectively.

[0017] Preferably, the torque motor is a frameless split type inner rotor motor; the detection member is an inductive magnetic encoder.

[0018] Preferably, the motor rotor axial gap adjustable direct drive rotary drive device is used in connection with a radar turntable to change the azimuth of the radar turntable; the end of the adjusting flange away from the casing is provided with an outer turntable connecting screw hole for connecting the radar turntable; the end of the adjusting shaft close to the adjusting flange is provided with a recessed shaft end connecting hole; the two ends of the casing are respectively provided with a connecting ear plate, and the connecting ear plate is provided with a casing connecting hole penetrating therethrough.

[0019] (Three) beneficial effects

[0020] Compared with the prior art, the motor rotor axial gap adjustable direct drive rotary drive device of the utility model utilizes the advantages of torque motor to realize direct drive, thereby eliminating the gap, resonance and positioning error introduced by other components, and also has the advantages of small size, simple maintenance and high reliability. In addition, the adjusting flange is used to adjust the axial position of the first rotating support and the rotor assembly, which changes the state that the axial position of the traditional rotary force output shaft is not adjustable. When assembling and subsequent maintaining, the axial position of the first rotating support and the rotor assembly can be fine-tuned according to actual needs, the installation flexibility is better, and the problem of axial movement can be effectively solved, thereby avoiding the problem of radar turntable vibration caused by axial movement, and greatly improving the accuracy of radar data acquisition. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description, obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0022] Figure 1 It is the whole structure section view schematic diagram of the present application;

[0023] Figure 2 It is the three-dimensional schematic diagram of the present application;

[0024] Figure 3 It is the three-dimensional schematic diagram of the adjusting flange in the present application;

[0025] Figure 4 It is the three-dimensional schematic diagram of the adjusting shaft in the present application;

[0026] Figure 5 It is the three-dimensional schematic diagram of the rear end cover in the present application Figure 1 ;

[0027] Figure 6 It is the three-dimensional schematic diagram of the rear end cover in the present application Figure 2 ;

[0028] Figure 7 It is the exploded schematic diagram of the rear end cover in the present application.

[0029] Explanation of reference signs:

[0030] 1, torque motor; 2, machine shell; 3, first rotating support; 4, rear end cover; 5, second rotating support; 6, first limit pre-tightening ring; 7, second limit pre-tightening ring; 8, lead wire bundle;

[0031] 11, stator assembly; 12, rotor assembly;

[0032] 21, stator mounting cavity; 22, first bearing chamber; 23, end cover mounting step groove;

[0033] 31, first bearing inner ring; 32, first bearing outer ring;

[0034] 41, end cover body; 42, adjusting ring;

[0035] 51, second bearing inner ring; 52, second bearing outer ring;

[0036] 111, stator core; 112, stator winding;

[0037] 121, magnetic steel; 122, rotor yoke; 123, adjusting flange; 124, adjusting shaft;

[0038] 211, stator limiting step;

[0039] 411, second bearing chamber; 412, sliding groove; 413, adjusting screw hole; 414, end cover mounting hole; 415, wire through channel;

[0040] 1231, pre-tightening pressing convex ring; 1232, outer rotating table connecting screw hole;

[0041] 1241, screw end; 1242, bearing limiting ring; 1243, shaft end connecting hole. DETAILED DESCRIPTION

[0042] In order to make the above objectives, characteristics and advantages of the utility model more apparent, obvious and easy to understand, the specific embodiments of the utility model will be described in detail below with reference to the drawings. In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the utility model, so the utility model is not limited by the specific implementation disclosed below.

[0043] The utility model discloses a motor rotor axial gap adjustable direct drive type rotary drive device will be described below with reference to the drawings Figures 1-7 The utility model discloses a motor rotor axial gap adjustable direct drive type rotary drive device will be described below with reference to the drawings

[0044] The utility model discloses a motor rotor axial gap adjustable direct drive type rotary drive device, include: torque motor 1, casing 2 and first rotation support piece 3, torque motor 1 includes rotor assembly 12 and the stator assembly 11 of setting in rotor assembly 12 outside, rotor assembly 12 and stator assembly 11 rotation is connected, be equipped with stator installation cavity 21 in casing 2, stator assembly 11 fixedly embed in stator installation cavity 21, rotor assembly 12 includes coaxial arrangement's rotor yoke 122, adjusting shaft 124 and adjusting flange 123, adjusting flange 123 is located in the outer side of one end of casing 2, adjusting shaft 124 passes through rotor yoke 122, and with rotor yoke 122 fixedly connected, adjusting shaft 124 one end is screw end 1241, screw end 1241 stretches into adjusting flange 123, and adjusting flange 123 is connected with adjusting shaft 124 threadedly, first rotation support piece 3 sets up in adjusting shaft 124 outside, and first rotation support piece 3 is located in the space that rotor yoke 122, adjusting flange 123, adjusting shaft 124 and casing 2 four enclose, adjusting shaft 124 is rotationally connected with casing 2 through first rotation support piece 3, adjusting flange 123 includes the pre-tightening pressing convex ring 1231 of setting opposite first rotation support piece 3, rotates adjusting flange 123, can drive pre-tightening pressing convex ring 1231 close to or away from first rotation support piece 3, to realize the axial pre-tightening adjustment of first rotation support piece 3.

[0045] More specifically, the adjusting flange 123 is internally threaded, and the threaded end 1241 of the adjusting shaft 124 is externally threaded.

[0046] In this embodiment, the force motor 1 can provide higher torque and lower speed. The motor rotor axial gap adjustable direct drive rotary drive device of the utility model is suitable for directly driving radar rotation. In use, the load (radar turntable) can be directly installed on the direct drive rotary drive device, specifically, the adjusting flange 123 can be fixedly connected with the radar turntable (not shown in the figure), and the direct drive rotary drive device of the utility model is used to directly drive the radar turntable to rotate, without the need of using a gear reduction box, thereby eliminating the problems of gap, resonance and positioning error caused by the introduction of intermediate components, improving the radar data acquisition accuracy, reducing the radar antenna transmission failure, and being easier to maintain and more reliable.

[0047] The rotor assembly 12 and the casing 2 are connected through the first rotation support 3, which is a variety of structures for realizing the rotation connection of the rotor assembly 12 and the casing 2, such as a bearing or a rotating wear-resistant sleeve. The adjusting flange 123 and the adjusting shaft 124 are threadedly connected, the adjusting flange 123 is rotated, the pre-tightening pressure clamping protruding ring 1231 presses and clamps the first rotation support 3, the axial pre-tightening adjustment of the first rotation support 3 is realized, and the axial gap adjustment of the rotor assembly 12 is realized, preventing the axial movement of the first rotation support 3 and the rotor assembly 12, and improving the transmission accuracy. And the axial movement distance of the adjusting flange 123 is equal for each rotation, which is convenient for realizing the accuracy control and adjustment of the pre-tightening amount.

[0048] Compared with the prior art, the motor rotor axial gap adjustable direct drive rotary drive device of the utility model utilizes the advantages of the force motor 1 to realize direct driving, thereby eliminating the problems of gap, resonance and positioning error caused by the introduction of intermediate components, and the direct drive rotary drive device also has the advantages of small size, simple maintenance and high reliability. In addition, the axial position of the first rotation support 3 and the rotor assembly 12 is adjusted by the adjusting flange 123, which changes the state that the axial position of the traditional rotary force output shaft is not adjustable. During assembly and subsequent maintenance, the axial position of the first rotation support 3 and the rotor assembly 12 can be fine-tuned according to actual needs, which is more flexible in installation and can effectively solve the problem of axial movement, thereby avoiding the problem of radar turntable vibration caused by axial movement, greatly improving the accuracy of radar data acquisition.

[0049] According to the specific embodiment of the utility model, the motor rotor axial gap adjustable direct drive type rotary drive device further includes a rear end cover 4 and a second rotating support 5, the rear end cover 4 is covered in the slot of stator installation cavity 21, the rear end cover 4 is fixedly connected with the shell 2, and the rear end cover 4 also abuts against the side of the stator assembly 11 away from the adjusting flange 123;The second rotating support 5 is sleeved on the adjusting shaft 124, and the second rotating support 5 is located in the space formed by the rotor yoke 122, the rear end cover 4 and the adjusting shaft 124;The adjusting shaft 124 is also rotatably connected with the shell 2 through the second rotating support 5;The first rotating support 3 and the second rotating support 5 are symmetrically arranged on the two sides of the rotor yoke 122.

[0050] In the embodiment, the rear end cover 4 is fixedly connected with the shell 2, and the two together form a relatively closed installation cavity, which is beneficial to improving the sealing performance and overall stability of the utility model. The rear end cover 4 also abuts against one side of the stator assembly 11, which is used to limit the axial displacement of the stator assembly 11 on that side. The first rotating support 3 and the second rotating support 5 are symmetrically arranged on the two sides of the rotor yoke 122, which improves the stability of the support, reduces the noise of the direct drive type rotary drive device of the utility model during operation, and improves the reliability and operation stability.

[0051] According to the specific embodiment of the utility model, the first rotating support 3 is a first bearing, and the first bearing includes a first bearing inner ring 31 and a first bearing outer ring 32;The second rotating support 5 is a second bearing, and the second bearing includes a second bearing inner ring 51 and a second bearing outer ring 52;The shell 2 further has a recessed first bearing chamber 22, the first bearing chamber 22 is located on one side of the stator installation cavity 21, the rear end cover 4 has a recessed second bearing chamber 411, the first bearing is accommodated in the first bearing chamber 22, the second bearing is accommodated in the second bearing chamber 411, the first bearing inner ring 31 and the second bearing inner ring 51 are respectively arranged outside the adjusting shaft 124, and the protruding ring 1231 is arranged opposite to the first bearing inner ring 31;The adjusting shaft 124 further has a protruding bearing limiting ring 1242, and the second bearing inner ring 51 abuts against the bearing limiting ring 1242 away from the adjusting flange 123;The first limiting and pre-tightening ring 6 is arranged between the first rotating support 3 and the rotor yoke 122;The second limiting and pre-tightening ring 7 is arranged between the second rotating support 5 and the rotor yoke 122;The first limiting and pre-tightening ring 6 and the second limiting and pre-tightening ring 7 are respectively movably sleeved outside the adjusting shaft 124.

[0052] In the embodiment, the rotating support (the first rotating support 3 and the second rotating support 5) is a bearing, which is beneficial to improve the rotating smoothness. The first bearing chamber 22 is used for accommodating the first rotating support 3, the side wall of the first bearing chamber 22 axially limits the first bearing outer ring 32, and the rotating adjusting flange 123 axially gap adjusts the first rotating support 3, and the pre-tightening abutting convex ring 1231 applies force to the first bearing inner ring 31, thereby realizing the adjustment of the axial gap of the first rotating support 3. That is, the structure of the embodiment can ensure that the first rotating support 3 is in a preset position, and does not affect the adjustment of the axial position of the adjusting flange 123.

[0053] The limiting pre-tightening ring (the first limiting pre-tightening ring 6 and the second limiting pre-tightening ring 7) is used for limiting the rotating support (the first rotating support 3 and the second rotating support 5), and can provide a certain pre-tightening force, thereby preventing the axial movement of the rotating support. The limiting pre-tightening ring can be a wave ring or a disc spring, and is preferably a wave ring. The wave ring can adjust the axial deformation of the bearing with force in different directions, thereby ensuring that the bearing is uniformly subjected to axial force and stably operates.

[0054] According to the specific embodiment of the utility model, the shell 2 further comprises an end cover mounting step groove 23; the end cover mounting step groove 23 is located on the other side of the stator mounting cavity 21; the rear end cover 4 comprises a coaxially arranged end cover body 41 and an adjusting ring 42, a second bearing chamber 411 is arranged on the end cover body 41, the end cover body 41 is mounted in the end cover mounting step groove 23, the end cover body 41 is provided with a recessed sliding groove 412 on the side close to the end cover mounting step groove 23, the adjusting ring 42 is slidably connected in the sliding groove 412, the end cover body 41 is provided with an adjusting screw hole 413 penetrating through the end cover body 41 and facing the adjusting ring 42, the adjusting screw hole 413 is provided with an adjusting screw (not shown in the figure) for adjusting the distance between the adjusting ring 42 and the bottom of the sliding groove 412, and the two side surfaces of the adjusting ring 42 abut against the stator assembly 11 and the adjusting screw, respectively.

[0055] In the embodiment, the end cover body 41 is fixed in the end cover mounting step groove 23, the end cover mounting step groove 23 can limit the axial displacement of the end cover body 41, and the stability of the position of the end cover body 41 is ensured. The adjusting ring 42 and the end cover body 41 are coaxially connected in sliding mode, the end cover body 41 can be tightly attached to the groove bottom of the end cover mounting step groove 23, the adjusting screw abuts against the adjusting ring 42, the extension length of the adjusting screw is adjusted, the distance between the adjusting ring 42 and the groove bottom of the sliding groove 412 is adjusted, and it is ensured that the adjusting ring 42 can always abut against the stator assembly 11, and the axial position of the abutting side of the stator assembly 11 is limited. In the embodiment, the rear end cover 4 is arranged in a split structure, the relative positions of the adjusting ring 42 and the end cover body 41 can be changed according to assembly needs, the adjusting ring 42 and the end cover body 41 are precisely mounted with respective mating parts respectively, and the assembly flexibility and the mounting precision can be improved.

[0056] According to the specific embodiment of the utility model, the end cover body 41 is provided with an end cover mounting hole 414 penetrating the end cover body 41 and arranged opposite to the groove bottom of the end cover mounting step groove 23, and the motor rotor axial gap adjustable direct drive type rotary drive device further comprises an end cover connecting screw (not shown in the figure) penetrating the end cover mounting hole 414 and extending into the casing 2, and the end cover connecting screw is used for fixing the end cover body 41 in the casing 2.

[0057] In the embodiment, the end cover connecting screw is used for detachably fixing and connecting the end cover body 41 and the casing 2. The disassembly and assembly are convenient. In the specific implementation, the end cover mounting hole 414 and the adjusting screw hole 413 are arranged staggered, and the end cover mounting hole 414 and the adjusting screw hole 413 are closer to the outer side wall of the end cover body 41.

[0058] According to the specific embodiment of the utility model, the casing 2 is in the form of a cylindrical shell as a whole, and the rotor assembly 12 is coaxially arranged with the casing 2; and the outer side wall of the stator assembly 11 and the inner side wall of the stator mounting cavity 21 are fixed by an adhesive.

[0059] In the embodiment, the rotor assembly 12 is coaxial with the casing 2, which is beneficial to ensuring the uniformity of the circumferential gap between the rotor assembly 12 and the casing 2. The adhesive can be a commonly used adhesive on the market, such as DG-3S glue. During assembly, a special tool can be used to bond the inner wall of the casing 2 and the force moment motor 1.

[0060] According to the specific embodiment of the utility model, the motor rotor axial gap adjustable direct drive type rotary drive device further includes a detection member for detecting the action parameter of the rotor assembly 12, the detection member is fixed to the side of the rear end cover 4 away from the stator mounting cavity 21;The detection member includes a detection lead-out wire;The torque motor 1 includes a motor lead-out wire;The outer side wall of the end cover body 41 is provided with a recessed wire through channel 415, the wire through channel 415 communicates the inside of the machine shell 2 and the outside space of the machine shell 2, and the detection lead-out wire and the motor lead-out wire all penetrate the wire through channel 415 and extend out of the machine shell 2.The detection lead-out wire and the motor lead-out wire jointly form a lead-out wire bundle 8.

[0061] More specifically, the detection member is an encoder.

[0062] The encoder can compress data into a smaller size, which helps to save storage space and transmission bandwidth. Since the encoder and the rotor assembly 12 (load) are directly coupled, the precision of the torque motor 1 is directly related to the precision of the encoder. Using a higher precision encoder can achieve higher control precision of the torque motor 1.

[0063] The wire through channel 415 is used for the lead-out wire bundle 8 to pass through, and limits the lead-out wire bundle 8 at a preset position, avoiding interference between the lead-out wire bundle 8 and other structures, which can improve the assembly reliability of the direct drive type rotary drive device of the utility model, prevent electromagnetic interference, and improve the precision of the radar system.

[0064] Further, in the embodiment, the wire through channel 415 is arranged on the outer side wall of the end cover body 41, which is beneficial to the detection lead-out wire and the motor lead-out wire away from the middle power output end. It can effectively avoid interference, has reasonable layout, and has reliable structure. In specific implementation, the position of the wire through channel 415 can be adjusted as needed.

[0065] According to the specific embodiment of the utility model, the stator assembly 11 includes a stator core 111 and a stator winding 112, and the stator winding 112 is nested in the stator core 111;The rotor assembly 12 further includes a magnetic steel 121 fixedly sleeved on the rotor yoke 122 or arranged in the rotor yoke 122;The stator mounting cavity 21 is circular stepped as a whole, the stator mounting cavity 21 is provided with a stator limiting step 211, and the two sides of the stator core 111 abut against the stator limiting step 211 and the adjusting ring 42 respectively.

[0066] More specifically, the magnetic steel 121 and the rotor yoke 122 are coaxially fixed and bonded, and the rotor assembly 12 includes two structures. Structure one: the magnetic steel 121 is arranged on the surface of the rotor yoke 122. Structure two: the magnetic steel 121 is arranged in the rotor yoke 122. Compared with the two structures, the manufacturing process of structure one is simpler, which is the preferred scheme.

[0067] In the embodiment, the two ends of the stator core 111 in the force moment motor 1 are respectively in abutment with the stator limiting step 211 and the rear end cover 4, the axial movement of the stator core 111 can be prevented, and the position stability of the stator core 111 is improved.

[0068] According to the specific embodiment of the utility model, the force moment motor 1 is a frameless split type inner rotor motor, and the detection member is an inductive magnetic encoder.

[0069] In the frameless split type inner rotor motor, the rotor assembly 12 of the inner rotor motor is located inside the stator assembly 11, the structure is compact, and the space can be effectively utilized. The inductive encoder has good flexibility, and the resolution and accuracy thereof can be adjusted. The shape of the inductive encoder can be changed as required, and the inductive encoder can be selected or designed as required. The coil pattern of the inductive encoder can be automatically generated by using software when the coil of the stator part is adjusted according to requirements, and the implementation difficulty is greatly reduced.

[0070] According to the specific embodiment of the utility model, the motor rotor axial gap adjustable direct drive type rotary driving device is used to be connected with a radar turntable to change the azimuth of the radar turntable. The end of the adjusting flange 123 away from the shell 2 is provided with an outer turntable connecting screw hole 1232 for connecting the radar turntable. The end of the adjusting shaft 124 close to the adjusting flange 123 is provided with a recessed shaft end connecting hole 1243. The two ends of the shell 2 are respectively provided with a connecting lug plate (not shown in the figure), and the connecting lug plate is provided with a shell connecting hole (not shown in the figure) penetrating therethrough.

[0071] In the embodiment, the shell connecting hole is used to realize the stable installation of the shell 2, and the shaft end connecting hole 1243 and the outer turntable connecting screw hole 1232 can be used to be directly connected with the radar turntable. Finally, the effect that the radar turntable rotates with the rotor assembly 12 is realized.

[0072] In the description of the utility model, it should be explained that, unless otherwise explicitly 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, it can be the communication inside two elements, or it can be "driven connection", that is, through various suitable ways such as belt drive, gear drive or chain wheel drive, power connection. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

Claims

1. A direct drive rotary drive device with adjustable axial gap of the rotor of an electric machine, characterized in that The torque motor, the casing and the first rotating support are included. The torque motor includes a rotor assembly and a stator assembly sleeved outside the rotor assembly, and the rotor assembly and the stator assembly are rotationally connected; the casing is internally provided with a stator mounting cavity, the stator assembly is fixedly embedded in the stator mounting cavity, the rotor assembly includes a rotor yoke, an adjusting shaft and an adjusting flange which are coaxially arranged; the adjusting flange is located outside one end of the casing; the adjusting shaft penetrates through the rotor yoke and is fixedly connected with the rotor yoke; one end of the adjusting shaft is a threaded end, the threaded end extends into the adjusting flange, and the adjusting flange is threadedly connected with the adjusting shaft; the first rotating support is sleeved outside the adjusting shaft, and the first rotating support is located in a space surrounded by the rotor yoke, the adjusting flange, the adjusting shaft and the casing; the adjusting shaft is rotationally connected with the casing through the first rotating support; the adjusting flange includes a pre-tightening pressing convex ring arranged opposite to the first rotating support; rotating the adjusting flange can drive the pre-tightening pressing convex ring to approach or move away from the first rotating support, so as to realize axial pre-tightening adjustment of the first rotating support. The motor rotor axial gap adjustable direct drive type rotary drive device further includes a rear end cover and a second rotating support, the rear end cover covers a slot of the stator mounting cavity, the rear end cover is fixedly connected with the casing, and the rear end cover also abuts against one side of the stator assembly away from the adjusting flange; the second rotating support is sleeved outside the adjusting shaft, and the second rotating support is located in a space surrounded by the rotor yoke, the rear end cover and the adjusting shaft; the adjusting shaft is also rotationally connected with the casing through the second rotating support; the first rotating support and the second rotating support are symmetrically arranged on both sides of the rotor yoke.

2. The motor rotor axial gap adjustable direct drive rotary drive of claim 1, wherein, The first rotating support is a first bearing, the first bearing includes a first bearing inner ring and a first bearing outer ring; the second rotating support is a second bearing, the second bearing includes a second bearing inner ring and a second bearing outer ring; the casing is further provided with a recessed first bearing chamber, the first bearing chamber is located on one side of the stator mounting cavity, the rear end cover is provided with a recessed second bearing chamber, the first bearing is accommodated in the first bearing chamber, the second bearing is accommodated in the second bearing chamber, the first bearing inner ring and the second bearing inner ring are respectively arranged outside the adjusting shaft, and the pre-tightening pressing convex ring is arranged opposite to the first bearing inner ring; the adjusting shaft is further provided with a convex bearing limiting ring, and one side of the second bearing inner ring away from the adjusting flange abuts against the bearing limiting ring; a first limiting pre-tightening ring is arranged between the first rotating support and the rotor yoke; a second limiting pre-tightening ring is arranged between the second rotating support and the rotor yoke; the first limiting pre-tightening ring and the second limiting pre-tightening ring are respectively movably sleeved outside the adjusting shaft.

3. The motor rotor axial gap adjustable direct drive rotary drive of claim 2, wherein, ​ 4. The motor rotor axial gap adjustable direct drive rotary drive of claim 3, wherein, The machine shell is also provided with an end cover mounting step groove; the end cover mounting step groove is located on the other side of the stator mounting cavity; the rear end cover comprises a coaxially arranged end cover body and an adjusting ring, the second bearing chamber is located on the end cover body, the end cover body is mounted in the end cover mounting step groove, the end cover body is provided with a recessed sliding groove near one side of the end cover mounting step groove, the adjusting ring is slidingly connected in the sliding groove, the end cover body is provided with an adjusting screw hole penetrating through the end cover body and facing the adjusting ring, the adjusting screw hole is provided with an adjusting screw for adjusting the distance between the adjusting ring and the bottom of the sliding groove, and the two side surfaces of the adjusting ring are respectively abutted with the stator assembly and the adjusting screw.

5. The motor rotor axial gap adjustable direct drive rotary drive of claim 4, wherein, The end cover body is provided with an end cover mounting hole penetrating through the end cover body and facing the bottom of the end cover mounting step groove, and the motor rotor axial gap adjustable direct drive type rotary drive device further comprises an end cover connecting screw penetrating through the end cover mounting hole and extending into the machine shell, and the end cover connecting screw is used for fixing the end cover body in the machine shell.

6. The motor rotor axial gap adjustable direct drive rotary drive of claim 5, wherein, The machine shell is a cylindrical shell as a whole, and the rotor assembly is coaxially arranged with the machine shell; the outer side wall of the stator assembly and the inner side wall of the stator mounting cavity are fixed by an adhesive.

7. The motor rotor axial gap adjustable direct drive rotary drive of claim 6 wherein, The motor rotor axial gap adjustable direct drive type rotary drive device further comprises a detection member for detecting the action parameter of the rotor assembly, and the detection member is fixed on the side of the rear end cover away from the stator mounting cavity; the detection member comprises a detection lead-out line; the torque motor comprises a motor lead-out line; the outer side wall of the end cover body is provided with a recessed wire penetrating channel, the wire penetrating channel communicates the inside of the machine shell and the outside space of the machine shell, and the detection lead-out line and the motor lead-out line both penetrate through the wire penetrating channel and extend out of the machine shell.

8. The motor rotor axial gap adjustable direct drive rotary drive of claim 7, wherein, The stator assembly comprises a stator core and a stator winding, and the stator winding is nested in the stator core; the rotor assembly further comprises a magnetic steel fixedly sleeved on the outside of the rotor yoke or in the rotor yoke; the stator mounting cavity is circular in shape as a whole, and the stator mounting cavity is provided with a stator limiting step; the two sides of the stator core are respectively abutted with the stator limiting step and the adjusting ring.

9. The motor rotor axial gap adjustable direct drive rotary drive of claim 8, wherein, The torque motor is a frameless split type inner rotor motor; the detection member is an inductive magnetic encoder.

10. The motor rotor axial gap adjustable direct drive rotary drive of any one of claims 1-9, wherein, The motor rotor axial gap adjustable direct drive type rotary drive device is used in connection with a radar turntable to change the azimuth of the radar turntable; one end of the adjusting flange away from the machine shell is provided with an outer turntable connecting screw hole for connecting the radar turntable; one end of the adjusting shaft close to the adjusting flange is provided with a recessed shaft end connecting hole; the two ends of the machine shell are respectively provided with a connecting ear plate, and the connecting ear plate is provided with a shell connecting hole penetrating through the connecting ear plate.

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