Thin motor capable of reducing signal interference

Abstract

The utility model relates to the technical field of motors, and particularly discloses a thin motor capable of reducing signal interference, which comprises a motor shell, a stator assembly, a rotor assembly, an encoder, a wire holder, a first wire structure and a second wire structure, the stator assembly, the rotor assembly and the encoder are all arranged in the motor shell, and the stator assembly comprises a stator coil; the wire holder is fixed on the outer surface of the motor shell, two ends of the first wire structure are respectively connected with the stator coil and the wire holder so as to transmit power signals, and two ends of the second wire structure are respectively connected with the encoder and the wire holder so as to transmit encoder signals; the first wire structure is wired in the motor shell, and one end, close to the wire holder, of the first wire structure extends out of the motor shell; the end, close to the encoder, of the second wire structure extends out of the motor shell, and the second wire structure is wired on the outer surface of the motor shell. According to the utility model, interference between power supply signals and encoder signals can be reduced, and the performance of the motor is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technical field especially a thin motor of reducing signal interference. BACKGROUND

[0002] Servo motor refers to the engine that controls the operation of mechanical elements in the servo system, and the servo motor can control the speed, and the position accuracy is very accurate, and is widely applied in various industrial fields. The servo motor is generally provided with an encoder inside. The traditional servo motor is configured with two groups of wires. One group is a power supply wire for supplying power to the stator coil, and the other group is an encoder wire for feeding back the signal of the encoder. Since the power supply wire transmits a strong electric signal, and the encoder wire transmits a weak electric signal, if the power supply wire and the encoder wire share the same terminal block, the power supply wire and the encoder wire will be close to each other, especially for thin motors, the power supply wire and the encoder wire will be closer, thereby causing signal interference and affecting the performance of the motor. SUMMARY

[0003] The utility model provides a thin motor of reducing signal interference can reduce the interference between power signal and encoder signal, guarantee the performance of motor.

[0004] To solve the above problems, the utility model adopts the following technical scheme:

[0005] The embodiment of the utility model provides a thin motor of reducing signal interference, including motor casing, stator assembly, rotor assembly, encoder, terminal block, first wire structure and second wire structure, the stator assembly, rotor assembly and encoder all are arranged in the motor casing, the stator assembly includes stator coil, the terminal block is fixed on the outer surface of motor casing, the both ends of first wire structure are connected with stator coil and terminal block respectively, to be used for transmitting power signal, the both ends of second wire structure are connected with encoder and terminal block respectively, to be used for transmitting encoder signal, the first wire structure is wired in the motor casing, and the end of first wire structure close to terminal block protrudes from the motor casing and is connected with terminal block, the end of second wire structure close to encoder protrudes from the motor casing, and the part of second wire structure protruding from the motor casing is wired on the outer surface of motor casing and is connected with terminal block.

[0006] In some embodiments, the outer surface of the motor casing is provided with a wiring groove, and the part of the second wire structure protruding from the motor casing is wired in the wiring groove.

[0007] In some embodiments, the first wire structure and the second wire structure are both flexible circuit boards.

[0008] In some embodiments, the terminal block is fixed at the bottom of the side surface of the motor housing, and the first wire structure is routed from the gap between the stator assembly and the motor housing.

[0009] In some embodiments, the terminal block has two wire outlet holes for respectively passing out the connection line for transmitting the power signal and the connection line for transmitting the encoder signal.

[0010] In some embodiments, the output shaft, the mounting seat, the first bearing and the lower end cover are further included; the output shaft is arranged in the motor housing, the inner ring of the first bearing is sleeved on the output shaft, the bottom of the motor housing is provided with a lower opening through which the first bearing passes, the mounting seat is arranged in the motor housing, the outer ring of the first bearing is fixedly arranged on the mounting seat, and the lower end cover is fixed on the motor housing and covers the lower opening.

[0011] In some embodiments, the mounting seat is provided with a mounting groove which is in abutment with the lower opening, and the first bearing is located in the mounting groove.

[0012] In some embodiments, the bottom of the motor housing is provided with an inner recessed lower groove, the lower opening is arranged on the inner wall of the lower groove, the encoder is fixed in the lower groove, the lower end cover covers the lower groove and covers the encoder, and the lower end cover is provided with a notch, and the second wire structure extends from the notch.

[0013] In some embodiments, the first bearing is located on the inner side of the stator assembly.

[0014] In some embodiments, the second bearing is further included, the inner ring of the second bearing is sleeved on the output shaft, the top surface of the motor housing is provided with an upper groove, the second bearing is located in the upper groove, and the outer ring of the second bearing is fixedly connected with the motor housing.

[0015] The utility model has at least the following beneficial effects: the first wire structure for transmitting the power signal is routed inside the motor housing, one end of the first wire structure close to the terminal block extends out of the motor housing and is connected with the terminal block; one end of the second wire structure for transmitting the encoder signal close to the encoder extends out of the motor housing, the part of the second wire structure extending out of the motor housing is routed on the outer surface of the motor housing and is connected with the terminal block; thus, the first wire structure and the second wire structure can share the same terminal block, and the motor housing wall is used to separate the first wire structure and the second wire structure, so as to avoid the first wire structure and the second wire structure being routed too close, reduce the interference between the power signal and the encoder signal, and ensure the performance of the motor. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The structure diagram of the thin motor for reducing signal interference in one embodiment of the utility model;

[0017] Figure 2 A structure schematic view of the thin motor for reducing signal interference according to an embodiment of the present application is shown from the bottom;

[0018] Figure 3 A cross-sectional view of the thin motor for reducing signal interference is shown. Figure 2

[0019] Figure 4 An exploded view of the thin motor for reducing signal interference according to an embodiment of the present application is shown.

[0020] Figure 5 A structure schematic view of the motor housing according to an embodiment of the present application is shown from the bottom;

[0021] Figure 6 A structure schematic view of the mounting seat according to an embodiment of the present application is shown.

[0022] Figure 7 A structure schematic view of the fixing member according to an embodiment of the present application is shown.

[0023] Figure 8 A structure schematic view of the motor housing according to an embodiment of the present application is shown from the top;

[0024] Figure 9 A structure schematic view of the stator assembly and the rotor assembly according to an embodiment of the present application is shown.

[0025] Figure 10 A structure schematic view of the stator assembly according to an embodiment of the present application is shown.

[0026] Figure 11 A structure schematic view of the rotor assembly according to an embodiment of the present application is shown.

[0027] Figure 12 A partial structure schematic view of the stator lamination according to an embodiment of the present application is shown.

[0028] Figure 13 A cross-sectional view of the rotor assembly along the A-A cross-sectional line is shown. Figure 11

[0029] Wherein, the reference signs are:

[0030] Stator assembly 10, stator lamination 100, winding slot 110, accommodating portion 120, bottom wall 121, first side wall 122, top wall 123, opening portion 130, second side wall 131;

[0031] Rotor assembly 20, magnet 210, rotor connecting plate 220, accommodating groove 221, center hole 222; ​​

[0032] Motor housing 300, lower opening 301, lower groove 302, upper groove 303, wiring groove 304, lower end cover 310, notch 311;

[0033] Output shaft 400;

[0034] First bearing 510, second bearing 520, mounting seat 530, mounting groove 531, positioning member 532, threaded hole 533, fixing member 540, through slot 541, encoder 550, connecting ring 560, connecting member 570;

[0035] Second wire structure 620;

[0036] Terminal block 700, wire outlet hole 710. DETAILED DESCRIPTION

[0037] The present application provides the following description with reference to the accompanying drawings to help comprehensively understand various embodiments of the present application as defined by the claims and their equivalents. The description includes various specific details to help understanding, but these details should be regarded as just exemplary. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the various embodiments described herein without departing from the scope and spirit of the present application.

[0038] In the description of the present application, the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0039] It should be understood that when one element (e.g., a first element) is "connected" to another element (e.g., a second element), the element can be directly connected to the other element, or there can be an intervening element (e.g., a third element) between the element and the other element.

[0040] The embodiment of the present application provides a thin motor for reducing signal interference, such as Figures 1-3As shown, the motor includes a motor housing 300, a stator assembly 10, a rotor assembly 20, an encoder 550, a terminal block 700, a first wire structure and a second wire structure 620. The stator assembly 10, the rotor assembly 20 and the encoder 550 are all arranged in the motor housing 300. The stator assembly 20 includes stator coils which are used to generate a changing magnetic field after being energized. The terminal block 700 is fixed on the outer surface of the motor housing 300 for wiring. The two ends of the first wire structure are connected to the stator coils and the terminal block 700 respectively. The first wire structure is used to transmit power signals. The terminal block 700 can be connected to a power supply device to deliver power signals to the first wire structure. The two ends of the second wire structure 620 are connected to the encoder 550 and the terminal block 700 respectively. The second wire structure 620 is used to transmit encoder signals. The terminal block 700 can be connected to an external control module. The encoder signals generated by the encoder 550 can be delivered to the control module through the second wire structure 620 and the terminal block 700 to feedback the rotation angle of the rotor assembly 20 to the control module.

[0041] The first wire structure is routed inside the motor housing 300. The end of the first wire structure close to the terminal block 700 extends out of the motor housing 300 and is connected to the terminal block 700. The motor housing 300 is naturally provided with an opening or a through hole for the first wire structure to pass through. The end of the second wire structure 620 close to the encoder 540 extends out of the motor housing 300. The part of the second wire structure 620 extending out of the motor housing 300 is routed on the outer surface of the motor housing 300 and is finally connected to the terminal block 700. In this way, the first wire structure and the second wire structure 620 can share the same terminal block 700, and the first wire structure and the second wire structure 620 are separated by the wall of the motor housing 300, avoiding the first wire structure and the second wire structure 620 being routed too close to each other, reducing the interference between the power signals and the encoder signals, and ensuring the performance of the motor.

[0042] In some embodiments, as shown in Figure 2 and Figure 3 The outer surface of the motor housing 300 is provided with a routing groove 304. The part of the second wire structure 620 extending out of the motor housing 300 is routed in the routing groove 304. The routing groove 304 can guide the routing of the second wire structure 620, limit the movement of the second wire structure 620 on the surface of the motor housing 300, and keep the ideal routing position. At the same time, the routing groove 304 protects the second wire structure 620. The second wire structure 620 does not protrude from the surface of the motor housing 300, and is not easily damaged during use or handling, thereby improving its service life.

[0043] In some embodiments, the first conductor structure and the second conductor structure 620 are both flexible circuit boards. Flexible circuit boards can provide excellent electrical performance and are resistant to bending and wear, and are suitable for the application scenario of this embodiment where wiring is performed in a small space.

[0044] Of course, according to actual needs, the first conductive wire structure and the second conductive wire structure 620 can also be conductive wires or wiring.

[0045] In some embodiments, as Figure 2 and Figure 3 As shown, the terminal block 700 is fixed to the bottom of the side of the motor housing 300, eliminating the need for space on the bottom of the motor housing 300 and making the bottom of the motor housing 300 relatively flat, making it easy to place and install. Furthermore, the second conductor structure 620 can be routed along the bottom of the motor housing 300 and ultimately directly connected to the terminal block 700, eliminating the need to route the conductor along the side of the motor housing 300. This shortens the routing distance of the second conductor structure 620.

[0046] The first wire structure is routed through the gap between the stator assembly 10 and the motor housing 300 to avoid interference with the stator assembly 10 and / or the rotor assembly 20. Specifically, the first wire structure can be routed through the gap between the bottom of the stator assembly 10 and the inner bottom wall of the motor housing 300.

[0047] In some embodiments, as Figure 2 As shown, the terminal block 700 has two wire outlet holes 710, which are respectively used for the first connecting wire for transmitting the power signal and the second connecting wire for transmitting the encoder signal to pass through. The first connecting wire can be directly connected to the first wire structure, or connected to the first wire structure through an intermediate device, and the second connecting wire can be directly connected to the second wire structure 620, or connected to the second wire structure 620 through an intermediate device.

[0048] Therefore, although the first conductive line structure and the second conductive line structure 620 share the same wiring base 700 , they are connected by different connecting wires, which does not affect the transmission of signals between each other.

[0049] Based on the above embodiment, this embodiment also provides another embodiment of a thin motor with reduced signal interference, such as Figure 4 and Figure 5As shown, the thin motor with the cover to reduce signal interference further comprises an output shaft 400, a mounting seat 530, a first bearing 510 and a lower end cover 310. The output shaft 400 is arranged in the motor housing 300, i.e. a part of the output shaft 400 extends into the motor housing 300 and the other part extends out of the motor housing 300 to connect to the driven part. The output shaft 400 is the part of the motor to provide driving force, and rotates when the motor works. The inner ring of the first bearing 510 is sleeved on the output shaft 400 to rotate with the output shaft 400.

[0050] The bottom of the motor housing 300 is provided with a lower opening 301 through which the first bearing 510 passes, and the lower opening 301 is in communication with the internal cavity of the motor housing 300, so that the first bearing 510 can be placed into the internal cavity of the motor housing 300 through the lower opening 301. The mounting seat 530 is arranged in the motor housing 300, i.e. in the internal cavity of the motor housing 300, and the outer ring of the first bearing 510 is fixedly arranged on the mounting seat 530 to fix the first bearing 510. The lower end cover 310 is fixed on the motor housing 300 and covers the lower opening 301 to prevent dust from entering the internal cavity of the motor housing 300 through the lower opening 301, thereby playing a dustproof role.

[0051] When installing the first bearing 510 of the embodiment, the first bearing 510 can be placed into the internal cavity of the motor housing 300 through the lower opening 301 and then fixed on the mounting seat 530. This installation method does not require complex processing of the motor housing 300, and the installation structure is simpler and facilitates the assembly of the bearing. The motor housing 300 can only be subjected to simple processing such as stamping, thereby saving the step of complex processing of the motor housing 300, simplifying the manufacturing process and reducing the manufacturing cost of the entire motor.

[0052] In the embodiment, the caliber of the lower opening 301 can be greater than the outer diameter of the first bearing 310 to facilitate the first bearing 510 to pass through the lower opening 301. Alternatively, the area of the lower opening 301 can be greater than the cross-sectional area of the first bearing 310 in the vertical cross section, so that the first bearing 510 can be deflected by a certain angle and then inserted into the lower opening 301 to be placed into the internal cavity of the motor housing 300.

[0053] In some embodiments, as Figures 4-6As shown, the mounting seat 530 is provided with a mounting groove 531 which is in butt joint with the lower opening 301, and the first bearing 510 is located in the mounting groove 531. The mounting groove 531 not only provides a mounting space for the first bearing 510, but also can limit the movement of the first bearing 510 in the radial direction, thereby playing a positioning role for the first bearing 510. Since the mounting groove 531 is in butt joint with the lower opening 301, after the first bearing 510 is passed through the lower opening 301, the first bearing 510 can be directly placed into the mounting groove 531, thereby facilitating the installation of the first bearing 510 and improving the assembly speed.

[0054] Further, the outer ring of the first bearing 510 is in clamping connection with the inner wall of the mounting groove 531, so as to fix the first bearing 510 to the mounting seat 530. The inner wall of the mounting groove 531 can be provided with a plurality of protruding clamping strips or clamping rings, which abut against the outer ring of the first bearing 510, thereby clamping and fixing the first bearing 510 in the mounting groove 531.

[0055] Alternatively, the outer ring of the first bearing 510 is in interference fit with the mounting groove 531, so as to fix the first bearing 510 to the mounting seat 530. Of course, the first bearing 510 can also be fixed on the mounting seat 530 by other ways such as welding, pasting, etc.

[0056] In some embodiments, as shown in Figures 4-6 The mounting seat 530 is provided with a downward protruding positioning member 532, the positioning member 532 is inserted into the lower opening 301 and abuts against the inner wall of the lower opening 301, so that the positioning member 532 is limited by the inner wall of the lower opening 301, and the radial movement of the mounting seat 530 in the lower opening 301 is limited accordingly, thereby positioning the mounting seat 530 and keeping it in a relatively stable position to stably support the first bearing 510.

[0057] Further, the positioning member 532 can be plate-shaped and distributed around the lower opening 301 in a plurality of circular shapes, or the positioning member 532 can be ring-shaped and coaxial with the lower opening 301.

[0058] In some embodiments, as shown in Figures 3-6 The bottom of the motor housing 300 is provided with an inner recessed lower groove 302, and the lower opening 301 is arranged on the inner wall of the lower groove 302. The encoder 550 is fixed in the lower groove 302, and the lower end cover 310 covers the lower groove 302 and covers the encoder 550 inside. Since the lower opening 301 is arranged on the inner wall of the lower groove 302, when the lower end cover 310 covers the lower groove 302, the lower opening 301 is also covered. The encoder 550 is covered inside by the lower end cover 310, so as to play a dustproof protection role for the encoder 550.

[0059] The lower end cover 310 is provided with a notch 311, and the second wire structure 620 extends from the notch 311, so that the second wire structure 620 can be wired on the outer surface of the motor housing 300. The lower groove 302 opened in the embodiment provides space for the installation of the encoder 550, so that the encoder 550 can not protrude from the bottom surface of the motor housing 300, and the bottom surface of the motor housing 300 is more flat.

[0060] In the embodiment, the notch 311 can be arranged at the edge of the lower end cover 310, and the second wire structure 620 can be directly wired on the outer surface of the motor housing 300 after extending from the notch 311, without the need to be wired along the surface of the lower end cover 310, so as to shorten the length of the wire on the outer surface of the motor housing 300, and ensure that the outer part of the second wire structure 620 can be wired in the wire slot.

[0061] Further, the lower groove 302 is fixed with a fixing member 540, and the encoder 550 is fixed on the fixing member 540. The fixing member 540 is a mounting carrier for the encoder 550, which can avoid abnormal situations such as short circuit of the encoder 550 compared with the motor housing 300 as the mounting carrier, and the thickness of the fixing member 540 can be greater than the thickness of the motor housing wall, which is more convenient for installing the encoder 550.

[0062] In the embodiment, the fixing member 540 can be annular, and the center hole thereof can be used for avoiding the output shaft 400 to avoid interference with the output shaft 400. The encoder 550 can be fixed on the fixing member 540 by various ways such as screw fixing and adhesive fixing.

[0063] Further, as shown in Figure 4 , Figure 6 and Figure 7 , the mounting seat 530 and the fixing member 540 are fixedly connected with the motor housing 300 through the same set of connecting members 570, so that the mounting seat 530 and the fixing member 540 can be installed and fixed through the connecting members 570, so as to simplify the installation structure.

[0064] In the embodiment, the connecting member 570 can be a screw, the fixing member 540 is provided with a through slot 541 penetrating through itself, the motor housing 300 is provided with a through hole, and the mounting seat 530 is provided with a threaded hole 533, the threaded hole 533, the through hole and the through slot 541 are in butt joint, and the screw can penetrate through the through slot 541 and the through hole and then be fixed into the threaded hole 533.

[0065] In some embodiments, as shown in Figure 4 and Figure 5As shown, the lower groove 302 is provided with a connecting ring 560, and the lower end cover 310 is fixedly connected with the connecting ring 560. On one hand, the connecting ring 560 can strengthen the structural strength of the motor housing 300, and on the other hand, the connecting ring 560 is equivalent to increasing the thickness of the mounting position, which is more convenient for the installation of the lower end cover 310.

[0066] The connecting ring 560 can abut against and be fixed on the inner wall of the lower groove 302. The connecting ring 560 can be fixed on the inner wall of the lower groove 302 by welding, pasting or the like.

[0067] The lower end cover 310 can be fixed on the connecting ring 560 by welding, screwing, pasting or the like.

[0068] In some embodiments, as shown in Figure 3 As shown, the first bearing 510 is located on the inner side of the stator assembly 10, and in the axial direction of the output shaft 400, the first bearing 510 does not protrude from the stator assembly 10. Compared with placing the first bearing 510 on the outer side of the stator assembly 10, the size of the entire motor in the axial direction of the output shaft 400 can be reduced, which provides conditions for making the motor thinner.

[0069] In some embodiments, as shown in Figure 3 , Figure 4 and Figure 8 The thin motor for reducing signal interference further comprises a second bearing 520, and an inner ring of the second bearing 520 is sleeved on the output shaft 400 to rotate together with the output shaft 400. The top surface of the motor housing 300 is provided with an upper groove 303, and the second bearing 520 is located in the upper groove 303, and an outer ring of the second bearing 520 is fixedly connected with the motor housing 300.

[0070] When installing the second bearing 520, the second bearing 520 is placed in the upper groove 303, which simplifies the installation structure of the second bearing 520 and facilitates the assembly of the second bearing 520.

[0071] Further, the outer ring of the second bearing 520 is clamped with the inner wall of the upper groove 303. The inner wall of the upper groove 303 can be provided with a plurality of protruding clamping strips or clamping rings, which abut against the outer ring of the second bearing 520, so as to clamp and fix the second bearing 520 in the upper groove 303.

[0072] Alternatively, the outer ring of the second bearing 520 is in interference fit with the upper groove 303, so as to fix the second bearing 520 in the upper groove 303. Of course, the second bearing 520 can also be installed and fixed in the upper groove 303 by welding, pasting or other ways.

[0073] On the basis of the above embodiments, the specific structures of the stator assembly 10 and the rotor assembly 20 will be described below.

[0074] In some embodiments, as Figures 9-11 As shown, the stator assembly 10 includes a stator sheet 100. The stator sheet 100 may be disc-shaped. A plurality of winding slots 110 are evenly arranged around the center of the stator sheet 100. The winding slots 110 are used to wind the stator coils. The rotor assembly 20 also includes a plurality of magnets 210 evenly arranged around the stator sheet 100. The magnets 210 are evenly distributed along the circumference with the center of the stator sheet 100 as the center, forming an outer rotor motor structure.

[0075] In this embodiment, the number of winding slots 110 is a multiple of 3, and the number of magnets 210 is a multiple of 2. When the number of winding slots 110 is 15, the number of magnets 210 is 14 or 16. When the number of winding slots 110 is 18, the number of magnets 210 is 14, 16, 18, 20, or 22. When the number of winding slots 110 is 24, the number of magnets 210 is 20, 22, 24, 26, or 28.

[0076] The following multiple groups of specific embodiments are provided:

[0077] (1) The number of winding slots 110 is 15, and the number of magnets 210 is 14;

[0078] (2) The number of winding slots 110 is 15, and the number of magnets 210 is 16;

[0079] (3) The number of winding slots 110 is 18, and the number of magnets 210 is 14;

[0080] (4) The number of winding slots 110 is 18, and the number of magnets 210 is 16;

[0081] (5) The number of winding slots 110 is 18, and the number of magnets 210 is 18;

[0082] (6) The number of winding slots 110 is 18, and the number of magnets 210 is 20;

[0083] (7) The number of winding slots 110 is 18, and the number of magnets 210 is 22;

[0084] (8) The number of winding slots 110 is 24, and the number of magnets 210 is 20;

[0085] (9) The number of winding slots 110 is 24, and the number of magnets 210 is 22;

[0086] (10) The number of winding slots 110 is 24, and the number of magnets 210 is 24;

[0087] (11) The number of winding slots 110 is 24, and the number of magnets 210 is 26;

[0088] (12) The number of wire grooves 110 is 24, and the number of magnets 210 is 28.

[0089] In order to illustrate the beneficial effects of the utility model, a plurality of experimental data will be provided in the following. Among them, the input voltage of each group of experiments is 220V, the rated speed is 180rpm, and the rated current is 0.65A.

[0090]

[0091]

[0092] In the above experiments, the maximum torque of the motors of the 2nd-5th groups, the 11th-14th groups and the 17th-18th groups is obviously greater than that of other groups, all of which are in the range of 4.7-5.3, and have the characteristics of large torque. Among them, the 12th group, i.e. the number of wire grooves 110 is 18 and the number of magnets 210 is 20, the maximum torque can reach 5.00N.m, and the working state is stable, which is the best ratio of wire grooves 110 and magnets 210, while the motors of the 13th group, the 17th group and the 18th group are weaker than the motor of the 12th group in stability.

[0093] Therefore, the ratio of the wire grooves 110 and the magnets 210 of the embodiment is more reasonable, which can improve the maximum torque of the motor.

[0094] In some embodiments, as shown in Figure 12 The wire groove includes a receiving portion 120 and an opening portion 130, the receiving portion 120 and the opening portion 130 are distributed from inside to outside along the radial direction of the stator lamination, and the receiving portion 120 and the opening portion 130 are connected to each other, and the opening portion 130 is opened at the outer circumferential surface of the stator lamination. The width of the opening portion 130 is smaller than the width of the receiving portion 120, and the opening portion 130 plays a role of closing the opening, which can limit the coil from separating from the wire groove, so that the coil is tightly wound in the wire groove.

[0095] Further, the receiving portion 120 has a bottom wall 121 close to the center of the stator lamination, two first side walls 122 and two top walls 123 close to the opening portion 130, and the opening portion 130 has two second side walls 131; the two sides of the bottom wall 121 are connected to the two first side walls 122 respectively, one end of the two top walls 123 is connected to the two first side walls 122 respectively, the other end of the two top walls 123 is connected to the two second side walls 131 respectively, and the two second side walls 131 are connected to the outer circumferential surface of the stator lamination. The receiving portion 120 is substantially in the form of a fan structure, and the opening portion 130 is substantially in the form of a straight slot structure.

[0096] Further, the two first side walls 122 are arranged along the radial direction of the stator lamination, and thus the distance between the two first side walls 122 gradually increases in the direction from inside to outside along the radial direction of the stator lamination. The two second side walls 131 are arranged parallel to each other, and the distance between the two second side walls 131 remains unchanged along the radial direction of the stator lamination.

[0097] In some embodiments, the angle a between the two first side walls 122 is 20°, and the angle b between the first side wall 122 and the top wall 123 connected thereto is 90°, which defines the shape of the accommodating portion 120 to be relatively regular.

[0098] In some embodiments, the radius R of the bottom wall 121 is 34.95-35.05 mm, preferably 35.00 mm, the distance L from the bottom wall 121 to the top wall 123 is 19.70-19.80 mm, preferably 19.75 mm, the distance S from the top wall 123 to the outer circumferential surface of the stator lamination is 0.7-0.9 mm, preferably 0.8 mm, and the distance d between the two second side walls 131 is 3.95-4.05 mm, preferably 4.00 mm. These dimensions define the winding slots to be more evenly distributed, and it is easier to achieve 18 winding slots.

[0099] Further, the distance between the two adjacent winding slots can be 4.55-4.65 mm, so that the distance between the winding slots remains relatively appropriate.

[0100] In some embodiments, the bottom wall 121 is connected to the first side wall 122 with a rounded corner, the first side wall 122 is connected to the top wall 123 with a rounded corner, the top wall 123 is connected to the second side wall 131 with a rounded corner, and the second side wall 131 is connected to the outer circumferential surface of the stator lamination with a rounded corner, which makes the connection position smoother and easier to demold after casting.

[0101] In some embodiments, as shown in Figure 3 and Figure 5 the rotor assembly further comprises a rotor connecting plate 220, and the magnets 210 are fixed to the inner side of the rotor connecting plate 220 so that the relative positions of the magnets 210 remain fixed.

[0102] Further, the bottom surface of the rotor connecting plate 220 has an inner recessed accommodating groove 221, the accommodating groove 221 can install a bearing to increase the smoothness and stability of the rotation of the rotor connecting plate 220, and the accommodating groove 221 is provided with a center hole 222 penetrating through the rotor connecting plate 220, and the output shaft of the motor passes through the center hole 222 and is connected to the rotor connecting plate 220.

[0103] In some embodiments, as shown in Figure 11 the outer diameter R1 of the rotor connecting plate 220 is 126 mm, and the inner diameter R2 is 113 mm. As shown inFigure 10 As shown, the outer diameter of the stator lamination 100 is 112 mm. A rotor and stator of this size is more suitable for the winding slot and magnet ratio of the above-described embodiments.

[0104] The terms and words used in the above description and claims are not limited to the bibliographical meanings, but are merely used to enable a clear and complete understanding of the present application by those skilled in the art. Accordingly, it should be apparent to those skilled in the art that the above description is provided only to illustrate the embodiments of the present application and not to limit the present application defined by the appended claims and their equivalents.

Claims

1. A thin motor that reduces signal interference, characterized by: The motor comprises a motor housing, a stator assembly, a rotor assembly, an encoder, a terminal block, a first wire structure and a second wire structure; the stator assembly, the rotor assembly and the encoder are arranged in the motor housing; the stator assembly comprises a stator coil; the terminal block is fixed on the outer surface of the motor housing; the two ends of the first wire structure are connected with the stator coil and the terminal block respectively for transmitting a power signal; the two ends of the second wire structure are connected with the encoder and the terminal block respectively for transmitting an encoder signal. The first wire structure is arranged inside the motor housing; the end of the first wire structure close to the terminal block extends out of the motor housing and is connected with the terminal block; the end of the second wire structure close to the encoder extends out of the motor housing; the part of the second wire structure extending out of the motor housing is arranged on the outer surface of the motor housing.

2. The thin motor with reduced signal interference of claim 1, wherein: The outer surface of the motor housing is provided with a wire arranging groove; the part of the second wire structure extending out of the motor housing is arranged in the wire arranging groove.

3. The thin motor with reduced signal interference of claim 1, wherein: The first wire structure and the second wire structure are both flexible circuit boards.

4. The thin motor with reduced signal interference of claim 1, wherein: The terminal block is fixed on the bottom of the side surface of the motor housing; the first wire structure is arranged in the gap between the stator assembly and the motor housing.

5. The thin motor with reduced signal interference of claim 1, wherein: The terminal block is provided with two wire holes; the two wire holes are respectively used for the connection lines for transmitting the power signal and the encoder signal to pass out.

6. The thin motor with reduced signal interference of any of claims 1-5, wherein: The motor further comprises an output shaft, a mounting seat, a first bearing and a lower end cover; the output shaft is arranged in the motor housing; the inner ring of the first bearing is sleeved on the output shaft; the bottom of the motor housing is provided with a lower opening through which the first bearing passes; the mounting seat is arranged in the motor housing; the outer ring of the first bearing is fixedly arranged on the mounting seat; the lower end cover is fixed on the motor housing and covers the lower opening.

7. The thin motor with reduced signal interference of claim 6, wherein: The mounting seat is provided with a mounting groove which is connected with the lower opening; the first bearing is arranged in the mounting groove.

8. The thin motor with reduced signal interference of claim 6, wherein: The bottom of the motor housing is provided with an inner recessed lower groove; the lower opening is arranged on the inner wall of the lower groove; the encoder is fixed in the lower groove; the lower end cover covers the lower groove and covers the encoder; the lower end cover is provided with a notch; the second wire structure extends out of the notch.

9. The thin motor with reduced signal interference of claim 6, wherein: The first bearing is arranged on the inner side of the stator assembly.

10. The thin motor with reduced signal interference of claim 6, wherein: The motor further comprises a second bearing; the inner ring of the second bearing is sleeved on the output shaft; the top surface of the motor housing is provided with an upper groove; the second bearing is arranged in the upper groove; the outer ring of the second bearing is fixedly connected with the motor housing.

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