CN214583316U

CN214583316U - Magnetoelectric encoder for sewing machine

Info

Publication number: CN214583316U
Application number: CN202120039020.5U
Authority: CN
Inventors: 吴海苗; 包马乾; 吴海刚
Original assignee: Hangzhou Chenkong Intelligent Control Technology Co ltd
Current assignee: Hangzhou Chenkong Intelligent Control Technology Co ltd
Priority date: 2021-01-08
Filing date: 2021-01-08
Publication date: 2021-11-02
Anticipated expiration: 2031-01-08

Abstract

The utility model discloses a magnetoelectric encoder for sewing machine, including motor stator, rotatory axis body, the axle sleeve, the magnetic ring, and PCB board subassembly including a plurality of hall element, be connected with the ring carrier on the PCB board subassembly, a plurality of spacing grooves along axial extension, be used for installing hall element have been laid to this ring carrier's first terminal surface along circumference, its second terminal surface, the position that corresponds with the spacing groove forms the perforation of intercommunication spacing groove, hall element's part falls into the spacing inslot, its stabilizer blade can pass and link to each other with PCB board subassembly after perforating. The utility model adds the ring-shaped bracket, and the positioning is more reliable and convenient during installation; through the fixed position cooperation of magnetic ring, axle sleeve and axis body to and the fixed cooperation of PCB board subassembly and motor stator, guarantee batch production's electric zero angle of motor and sewing machine aircraft nose needle stopping position, have fixed angular relation with encoder angle zero-bit, guarantee batch production's convenience and uniformity, improve production efficiency, reduction in production cost.

Description

Magnetoelectric encoder for sewing machine

Technical Field

The utility model belongs to the technical field of the encoder, especially, relate to a magneto electric encoder for sewing machine.

Background

The position feedback of the traditional sewing machine spindle motor mostly adopts a photoelectric encoder. Due to the characteristics of the working environment of the sewing machine, sundries such as lubricating oil greasy dirt particles of the sewing machine and fabric fine fibers exist, so that the grating pulse is lost, and the complete machine fault is caused. The magnetic encoder is used for magnetic signal detection, has the characteristics of pollution resistance, vibration resistance and the like, effectively reduces the position feedback fault of a sewing machine motor, and is gradually replacing the application of a photoelectric encoder in the sewing industry.

The sewing machine industry has very high requirements on the accessory cost and the production efficiency of the whole machine. Based on the working characteristics of a sewing machine, a fixed needle stopping position is required, and the traditional method is to add a path of independent switch signal detection on the basis of a motor photoelectric encoder, adopt a magnet and a switch Hall element, adjust the position of the magnet in the assembling process and realize the adjustment of the needle stopping position. When the photoelectric encoder is installed, the rotation angle in the circumferential direction also needs to be adjusted, so that the Z-phase angle of the photoelectric feedback and the electric angle of the motor have a fixed corresponding relation. The whole hardware cost of the set of mode is high, and the production efficiency is low.

The utility model discloses aim at solving the not enough of present trade application, adopt the magnetic encoder who has unified initial positioning information, cancel the independent aircraft nose of traditional mode and stop the angular adjustment of needle locating signal and assembling process. The reliability is enhanced, the cost of the whole scheme is reduced, the production efficiency is improved, and the position adjusting procedure in the assembling process is omitted. The convenience and consistency of the mass production and assembly process of the motor and the sewing machine are effectively solved.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model provides a low-cost and high-reliability magneto-electric encoder with unified initial positioning information for sewing machine.

The utility model provides a technical scheme that its technical problem adopted is: the utility model provides a magnetoelectric encoder for sewing machine, includes motor stator, is located the rotatory axis body at motor stator center, the axle sleeve that links to each other with the axis body, the magnetic ring of being connected with the axle sleeve splines, and the PCB board subassembly including a plurality of hall element, be connected with the ring carrier on the PCB board subassembly, a plurality of spacing grooves along axial extension, be used for installing hall element have been laid to the first terminal surface of this ring carrier along circumference, and its second terminal surface, the position that corresponds with the spacing groove form the perforation of intercommunication spacing groove, the part of hall element falls into the spacing inslot, and its stabilizer blade can pass and link to each other with the PCB board subassembly after perforating.

The utility model has the advantages that the annular support is arranged on the PCB assembly, the positioning effect is formed on the Hall element by the annular support, the positioning is more reliable, the position precision of the Hall element is higher, and the assembly structure is simple; meanwhile, the Hall element is inserted into the annular support in advance and fixed on the PCB, so that automatic welding of all elements can be realized, the processing cost is reduced, and the efficiency is improved.

Furthermore, a positioning boss extending along the radial direction is formed on the inner ring of the magnetic ring, a groove is formed on the outer ring of the shaft sleeve, and the groove and the positioning boss are in clearance fit; the magnetic ring is magnetized by 2 radial poles, and takes a radial line passing through the center line of the positioning boss as a center, one side of the magnetic ring is an N pole, and the other side of the magnetic ring is an S pole. The matching structure between the magnetic ring and the shaft sleeve is simple and stable.

Furthermore, the inner ring of the shaft sleeve forms a cutting surface, and the outer wall of the shaft body forms a horizontal plane which is attached to the cutting surface. The matching structure between the shaft sleeve and the shaft body is simple and effective.

The utility model discloses a set up magnetic ring and the installation of axle sleeve circumference fixed position, axle sleeve and the installation of axle body circumference fixed position, and the horizontal cutting face of axle body has fixed angular position relation with motor magnet steel, the magnetic ring magnetizes and magnetizes with the central line symmetry of the inboard location boss of magnetic ring again, so the process, the magnetic field of the motor magnet steel magnetic field of having guaranteed batch production and magnetoelectric encoder magnetic ring has unified signal corresponding relation, like this in the batch production in-process, and in the after-sales service, need not adjustment control ware electrical angle offset parameter and angle counterpoint operation, realize the arbitrary matching of the same parameter of controller and motor, further improve motor assembly efficiency, reduce assembly cost, reduce the after-sales operation degree of difficulty.

Furthermore, a neck is formed between the first end face and the second end face of the annular support, a shielding ring is sleeved on the neck, and the height of the shielding ring is equivalent to the depth of the limiting groove. The purpose of adding the shielding ring is to improve the immunity of the magnetoelectric encoder to an external magnetic field; the design of the neck part can accommodate the shielding ring, and the shielding ring and the annular bracket can be integrally formed by injection molding; the height of the shielding ring is equal to the depth of the limiting groove, the depth of the limiting groove is equal to the height of the magnetic sensitive detection part of the Hall element, all the parts are mutually matched, the flatness of the outer surface of the assembled Hall element is guaranteed, and the Hall element is assisted to achieve higher detection precision and enhanced detection sensitivity.

Furthermore, be equipped with two at least locating pins on the second terminal surface of ring carrier, be equipped with the trompil that supplies the locating pin to stretch into on the PCB board subassembly, through the locating pin and the PCB board cooperation location of integrative moulding plastics on the ring carrier, reduce hall element pin axial and radial atress, improve the shock resistance simultaneously.

Furthermore, the number of the limiting grooves is six or three; the shape of the limiting groove is the same as that of the Hall magnetic sensitive plastic package part and is in a trapezoidal hexagon shape; the Hall element magnetic-sensitive detection part and the magnetic ring which are arranged in the limiting groove are arranged on the same horizontal plane and are circumferentially and uniformly distributed. Six paths of limiting grooves are adopted, six paths of Hall elements can be assembled, two Hall elements which are symmetrical at 180 degrees are subjected to differential processing to form three paths of sinusoidal voltage signals with phase difference of 120 degrees, the angle is output through signal decoding and temperature compensation, the precision of the encoder is improved, three paths of Hall elements are adopted to directly form three paths of sinusoidal voltage signals with phase difference of 120 degrees, the angle is output through signal decoding and temperature compensation, and the three paths of Hall elements are applied to some low-resolution output occasions with more rigorous cost; the shape of the limiting groove is similar to that of the Hall magnetic sensitive plastic package part and is in a trapezoidal hexagon, so that the limiting groove can well fix the Hall element and prevent the Hall element from being inserted reversely in the assembling process; the Hall element magnetic-sensing detection part and the magnetic ring which are arranged in the limiting groove are arranged on the same horizontal plane and are circumferentially and uniformly distributed so as to effectively detect the change of the magnetic field.

Furthermore, the PCB of the PCB assembly is provided with at least three non-circumferentially and uniformly distributed mounting holes, and the outer ring of the PCB forms a rotation-stopping positioning surface. The purpose of the design is to ensure that a Hall detection part of the magnetoelectric encoder has a fixed circumferential rotation position assembly relation with a motor stator, and has a fixed position relation with a motor flux linkage according to a magnetic field of a front magnetic ring, and a signal detection part of the encoder has a fixed position relation with the motor stator, so that an angle zero position output by the magnetoelectric encoder and an electric angle zero position of the motor are ensured to have a fixed position relation; the motor stator and the sewing machine head are assembled with a fixed positioning relation, so that the needle stop position of the machine head and the angle zero position of the encoder have a fixed angle relation; therefore, according to the preset uniform position deviation, under the condition of not adjusting any position, the electric zero angle of the motor and the needle stop position of the machine head of all the magnetic encoders, the motor and the sewing machine heads of the same type are uniform, and no position information needs to be adjusted in production and after-sale maintenance.

Further, be equipped with the output connector on the PCB board, be equipped with Z signal line interface on this output connector, the characteristic of Z signal line is: and rotating the magnetic ring, and when the radial line of the central line of the positioning boss is vertical to the radial line of the central line of the first Hall element on the PCB assembly, the Z signal line generates signal edge jumping. The Z signal has an edge jump, namely, the Z signal represents that the magnetoelectric encoder is at a zero angle position at the moment; and magnetic encoder magnet steel and motor shaft, magnetic encoder stator and motor stator all have fixed position assembly relation, consequently, when the border jump takes place for the Z signal, the electric angle position of motor also is known.

Furthermore, the output connector is at least provided with an orthogonal AB signal line interface and a handpiece needle-stopping positioning signal line interface; the signal characteristic of the machine head needle-stop positioning signal line interface is that a rotating magnetic ring always has a fixed orthogonal AB pulse count value theta between the edge jump of the signal line interface and the edge jump of the Z signal line when the edge jump of the signal line interface occurs.

Furthermore, the PCB is provided with an MCU, and the MCU is internally provided with a storage unit for storing the count value theta.

The utility model discloses a when the aircraft nose was installed to the motor, motor stator had fixed cooperation installation relation with the aircraft nose, and the needle position that stops of every aircraft nose is only definite, consequently through set for fixed AB pulse count value theta in encoder MCU, also fixed angle offset, and the needle position signal is stopped in the output, and when the border that the controller detected this signal changed, the aircraft nose can be controlled and needle is stopped to only definite position.

The utility model discloses an on the motor position signal feedback basis of traditional output, increase aircraft nose stop needle positioning signal all the way, utilize the inherent absolute position attribute of magnetoelectric encoder of single antipodal magnetic ring, save traditional stop needle signal, reduce cost is compatible with traditional sewing machine controller interface simultaneously, reduces application cost. The storage parameters are set in the MCU, and unified motor electric angle zero position information and machine head needle stop position information are set, so that the application of different sewing machine product types and different sewing machine factory home products is conveniently popularized.

The utility model has the advantages that: the annular support is added, so that the magnetic sensitive detection part of the Hall element is assembled and connected with the annular support, and the support legs of the Hall element penetrate through the annular support and then are welded and connected with the PCB assembly; through the fixed position cooperation of magnetic ring, axle sleeve and axis body to and the fixed cooperation of PCB board subassembly and motor stator, guarantee batch production's the electric zero angle of motor and sewing machine aircraft nose needle stopping position, have fixed angle relation with encoder angle zero-bit, through parameter setting, guarantee batch production's convenience and uniformity, improve production efficiency, reduction in production cost, reduce and maintain the degree of difficulty, have very practical spreading value.

Drawings

Fig. 1 is a perspective view 1 of the present invention.

Fig. 2 is a perspective view of the present invention 2.

Fig. 3 is an exploded view of the present invention.

Fig. 4 is a front view of the encoder assembly (encoder stator and rotor) of the present invention.

Fig. 5 is a cross-sectional view of an encoder assembly (encoder stator and rotor) according to the present invention.

Fig. 6 is the utility model discloses ring carrier and PCB board welding position sketch map.

Fig. 7 is a first perspective view of the ring support of the present invention.

Fig. 8 is a second perspective view of the ring support of the present invention.

Fig. 9 is a cross-sectional view of the ring support of the present invention.

Fig. 10 is a perspective view of the rotor assembly (encoder rotor and motor rotor) of the present invention.

Fig. 11 is an exploded view of the rotor assembly (encoder rotor and motor rotor) of the present invention.

Fig. 12 is a perspective view of the shaft sleeve of the present invention.

Fig. 13 is a schematic view of the magnetic ring of the present invention.

Fig. 14 is a perspective view of a stator assembly (encoder stator and motor stator) according to the present invention.

Fig. 15 is a schematic view of the positioning mode of the encoder stator and the motor rear end cover of the present invention.

Fig. 16 is a schematic diagram of the output logic of the present invention.

Detailed Description

In order to make the technical solution of the present invention better understood, the following figures in the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.

As shown in fig. 1-16, a magnetoelectric encoder for a sewing machine includes a motor stator 1, a rotating shaft body 2 located at the center of the motor stator 1, a shaft sleeve 3 connected with one end of the shaft body 2, a magnetic ring 4 connected with the shaft sleeve 2 in a rotation stopping fit manner, and a PCB board assembly 5 including a plurality of hall elements 7; the magnetic ring 4 is magnetized with 2 radial poles, one side of the magnetic ring is a semicircular N pole, the other side of the magnetic ring is a semicircular S pole, a positioning boss 41 is formed on the inner ring of the magnetic ring 4, specifically, a radial line passing through the center line of the positioning boss 41 is taken as the center, one side of the magnetic ring is the N pole, and the other side of the magnetic ring is the S pole.

The PCB board assembly 5 is connected with an annular support 6, the annular support 6 is provided with a first end face 61 and a second end face 62 opposite to the first end face 61, a plurality of limiting grooves 63 are distributed on the first end face 61 along the circumferential direction, the limiting grooves 63 extend along the axial direction of the annular support 6, and the Hall element 7 is installed on the limiting grooves. Specifically, in the present embodiment, the number of the limiting grooves 63 is six, and the limiting grooves are uniformly arranged at intervals in the circumferential direction. Of course, in other embodiments, the number of the limiting grooves 63 may be three.

The second end surface 62 of the ring support 6 is formed with protrusions 64, the positions of which correspond to the positions of the limiting grooves 63, that is, the number of the protrusions 64 is six, and through holes 65, which penetrate through the entire axial thickness direction of the protrusions 64 and have one end opening communicated with the limiting grooves 63, are formed in the protrusions 64. The number of the through holes 65 in each of the stopper grooves 63 is three. Of course, the projection 64 may be eliminated.

The shape of the limiting groove 63 is similar to that of the Hall magnetic sensitive plastic package part and is in a trapezoidal hexagon shape. During assembly, the magnetic sensing detection part of the Hall element 7 falls in the limiting groove 63, and three support legs 71 of the Hall element respectively pass through the through holes 65 and then are connected with the PCB 52 in a welding mode.

In order to ensure that the hall element 7 and the PCB panel assembly 5 do not generate relative offset when being fixedly connected, at least two positioning pins 67 are arranged on the second end surface 62 of the annular bracket 6, openings 51 for the positioning pins 67 to extend into are arranged at corresponding positions on the PCB 52, and the positioning pins 67 and the through holes 65 are alternately arranged at intervals.

The PCB 52 is provided with three non-circumferentially uniformly distributed mounting holes 53, and the outer ring of the PCB 52 is provided with a rotation stop positioning surface 54, so that the consistency of the mounting direction can be ensured by the matching of the PCB assembly and the motor stator 1 through the non-circumferentially uniformly distributed mounting holes 53 and the rotation stop positioning surface 54.

As shown in fig. 15, the PCB 52 is provided with an output connector 55, the output connector 55 is provided with an orthogonal AB signal line interface 56, a handpiece needle-stopping positioning signal line interface 58 and a Z signal line interface 57, and the Z signal is characterized in that: rotating the magnetic ring 4, and when the radial line of the central line of the positioning boss 41 is vertical to the radial line of the central line of the first Hall element 7a on the PCB plate component 5, the signal edge jumping of the Z signal line occurs; the head needle stop positioning signal is characterized in that the magnetic ring 4 rotates, and when the edge of a signal of the signal line interface 58 jumps, a fixed orthogonal AB pulse count value theta is always arranged between the signal and the Z signal line edge jump.

In order to facilitate storage and retrieval of the set angle value, the MCU59 is disposed on the PCB 52, and the MCU59 is internally provided with a storage unit for storing a count value θ.

In order to ensure the detection accuracy of the hall element 7, the shielding ring 8 is sleeved on the outer ring of the annular support 6, specifically, a neck 66 is formed between the first end surface 61 and the second end surface 62 of the annular support 6, the shielding ring 8 is clamped outside the neck 66 in a tight fit manner, the shielding ring 8 can be formed by integral injection molding with the annular support 6, and the height of the shielding ring 8 is equal to the depth of the limiting groove 63, so that the shielding ring corresponds to the magnetic sensitive detection part of the hall element 7.

In order to realize the rotation-stopping fit connection of the magnetic ring 4 and the shaft sleeve 3, a positioning boss 41 is formed on the inner ring of the magnetic ring 4, the positioning boss protrudes along the radial direction of the magnetic ring 4, a groove 31 is formed on the outer ring of the shaft sleeve 3, the shape and the size of the groove 31 are matched with the positioning boss 41, and the groove 31 and the positioning boss 41 form clearance tight fit.

In order to realize the connection between the shaft body 2 and the shaft sleeve 3, a horizontal cutting surface 32 is formed on the inner ring of the shaft sleeve 3, the outer wall of the shaft body 2 is cut to form a horizontal plane which is attached to the cutting surface 32, and the two are in clearance tight fit. Meanwhile, a threaded hole for mounting a jackscrew is formed in the center of the shaft sleeve 3.

The above detailed description is provided for illustrative purposes, and is not intended to limit the present invention, and any modifications and variations of the present invention are within the spirit and scope of the following claims.

Claims

1. The utility model provides a magnetoelectric encoder for sewing machine which characterized in that: including motor stator (1), be located motor stator (1) central rotatory axis body (2), axle sleeve (3) continuous with axis body (2), magnetic ring (4) of being connected with axle sleeve (3) spline fit, and PCB board subassembly (5) including a plurality of hall element (7), be connected with ring carrier (6) on PCB board subassembly (5), a plurality of spacing grooves (63) that extend along the axial are laid along circumference in first terminal surface (61) of this ring carrier (6), are used for installing hall element (7), and its second terminal surface (62), the position that corresponds with spacing groove (63) form perforation (65) that communicate spacing groove (63), the magnetism sensing part of hall element (7) falls into spacing groove (63), and its pin (71) can pass and link to each other with PCB board subassembly (5) behind perforation (65).

2. The magnetoelectric encoder for the sewing machine according to claim 1, characterized in that: a positioning boss (41) extending along the radial direction is formed on the inner ring of the magnetic ring (4), a groove (31) is formed on the outer ring of the shaft sleeve (3), and the groove (31) and the positioning boss (41) are in clearance fit; the magnetic ring (4) is magnetized in a radial 2-pole mode, a radial line passing through the center line of the positioning boss (41) is taken as a center, an N pole is arranged on one side of the magnetic ring, and an S pole is arranged on the other side of the magnetic ring.

3. A magnetoelectric encoder according to claim 1 or 2, characterized in that: the inner ring of the shaft sleeve (3) forms a cutting surface (32), and the outer wall of the shaft body (2) forms a horizontal plane (21) attached to the cutting surface (32).

4. The magnetoelectric encoder for the sewing machine according to claim 1, characterized in that: a neck (66) is formed between the first end face (61) and the second end face (62) of the annular support (6), a shielding ring (8) is sleeved on the neck, and the height of the shielding ring (8) is equivalent to the depth of the limiting groove (63).

5. The magnetoelectric encoder for the sewing machine according to claim 1, characterized in that: and at least two positioning pins (67) are arranged on the second end face (62) of the annular support (6), and an opening (51) for the positioning pins (67) to extend into is formed in the PCB plate assembly (5).

6. The magnetoelectric encoder for the sewing machine according to claim 1, characterized in that: the number of the limiting grooves (63) is six or three; the shape of the limiting groove (63) is the same as that of the Hall magnetic sensitive plastic package part and is in a trapezoidal hexagon; the magnetic sensitive detection part of the Hall element (7) arranged in the limit groove (63) and the magnetic ring (4) are arranged on the same horizontal plane and are circumferentially and uniformly distributed.

7. The magnetoelectric encoder for the sewing machine according to claim 1, characterized in that: the PCB (52) of the PCB component (5) is provided with at least three non-circumferential uniformly distributed mounting holes (53), and the outer ring of the PCB (52) forms a rotation-stopping positioning surface (54).

8. The magnetoelectric encoder for the sewing machine according to claim 7, characterized in that: an output connector (55) is arranged on the PCB (52), and a Z signal line interface (57) is arranged on the output connector (55); the signal characteristics of the Z signal line interface (57) are as follows: and rotating the magnetic ring (4), and when the radial line of the central line of the positioning boss (41) is vertical to the radial line of the central line of the first Hall element (7a) on the PCB assembly (5), the signal edge of the Z signal line jumps.

9. The magnetoelectric encoder for the sewing machine according to claim 8, characterized in that: the output connector (55) is at least provided with an orthogonal AB signal line interface (56) and a handpiece needle-stopping positioning signal line interface (58); the signal characteristic of the handpiece needle-stopping positioning signal line interface (58) is that the rotating magnetic ring (4) always has a fixed orthogonal AB pulse count value theta between the edge jump of the signal line interface (58) and the edge jump of the Z signal line when the edge jump of the signal line interface (58).

10. A magnetoelectric encoder according to claim 1 or 9, characterized in that: the PCB (52) is provided with an MCU (59), and the MCU (59) is internally provided with a storage unit for storing a count value theta.