A magnetic encoder motor structure based on off-chip contour positioning

Abstract

The application relates to a motor structure of a magnetic encoder based on an out-of-chip contour positioning, which comprises a front end cover, a rotor assembly, a stator assembly, a rear end cover assembly, a printed circuit board assembly with a magnetic encoding chip, a permanent magnet and a wire box, the printed circuit board assembly with the magnetic encoding chip comprises a printed circuit board with the magnetic encoding chip and a mounting frame, and the printed circuit board with the magnetic encoding chip is matched with an inner profiling contour gap of the mounting frame through a chip package out-of-contour. Compared with the prior art, the application has the advantages of improved relative position accuracy of a signal receiving end of a magnetic encoder and a signal output source.

Description

Technical Field

[0001] This invention relates to a motor structure, and more particularly to a magnetic encoder motor structure based on chip outer contour positioning. Background Technology

[0002] Magnetic encoder motors are widely used in aerospace, medical, and robotic arm fields due to their high sensitivity, good temperature stability, and strong anti-interference capabilities. However, in applications, the signal receiver (magnetic encoder chip) and the signal output source (permanent magnet) are required to have good relative structural accuracy. How to control the alignment accuracy between the signal receiver and the signal output source has become a key issue in the manufacturing of magnetic encoder motors.

[0003] A search of CN102257364A, which describes a motor with a structure exhibiting good relative accuracy between the signal receiver and the signal output source, reveals a structure that achieves good concentricity between the rotary encoder chip and the mounting surface of the kit by using tooling for positioning and injection molding to connect the rotary encoder chip to the mounting metal kit. However, this existing patent uses plastic coating, which complicates the motor manufacturing process and is also not conducive to optimizing the motor space. Summary of the Invention

[0004] The purpose of this invention is to overcome the defects of the prior art and provide a magnetic encoder motor structure based on chip outer contour positioning.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] According to one aspect of the present invention, a magnetic encoder motor structure based on chip outer contour positioning is provided. The motor structure includes a front end cover, a rotor assembly, a stator assembly, a rear end cover assembly, a printed circuit board assembly with a magnetic encoder chip, a permanent magnet, and a junction box. The printed circuit board assembly with the magnetic encoder chip includes a printed circuit board with the magnetic encoder chip and a mounting bracket. The printed circuit board with the magnetic encoder chip is in clearance fit with the inner contour of the mounting bracket through the chip encapsulation outer contour.

[0007] As a preferred technical solution, the inner contour of the mounting bracket has a shape similar to the outer contour of the chip encapsulation, preferably square.

[0008] As a preferred technical solution, the chip end face of the printed circuit board with magnetically encoded chip is attached to the mounting bracket plane of the mounting bracket, and glue is applied and fixed in the glue dispensing groove.

[0009] As a preferred technical solution, the outer circular surface of the mounting bracket is fitted with the inner stop of the rear end cover in the rear end cover assembly, and the end face of the mounting bracket is attached to the mounting surface of the rear end cover and fixed with adhesive.

[0010] As a preferred technical solution, the printed circuit board with magnetically encoded chips is provided with power line holes, and the mounting bracket is provided with a wire guide groove aligned with the power line holes.

[0011] As a preferred technical solution, the stator assembly includes a pin that passes through a wire slot and a power wire hole, and the pin is soldered to the power wire hole for conduction.

[0012] As a preferred technical solution, the inner contour of the mounting bracket is concentrically set with the outer circular surface.

[0013] As a preferred technical solution, the outer circular surface of the mounting bracket is concentrically set with the bearing chamber of the rear end cover by cooperating with the inner stop of the rear end cover.

[0014] As a preferred technical solution, the bearing chamber of the rear end cover and the inner stop of the rear end cover are concentrically arranged.

[0015] As a preferred technical solution, the rotor assembly includes a rotating shaft, wherein the rotating shaft step one and rotating shaft step two are concentrically arranged, and the inner and outer circles of the permanent magnet are concentrically arranged.

[0016] Compared with the prior art, the present invention improves the relative positional accuracy between the signal receiving end and the signal output source of the magnetic encoder, and uses the outer contour of the chip for positioning to achieve the concentricity requirement between the chip and the permanent magnet. Attached Figure Description

[0017] Figure 1 This is an exploded structural diagram of the printed circuit board assembly with magnetically encoded chips according to the present invention.

[0018] Figure 2 This is a cross-sectional view of the printed circuit board assembly with magnetically encoded chips according to the present invention.

[0019] Figure 3 This is a front view of the printed circuit board assembly with magnetically encoded chips according to the present invention.

[0020] Figure 4 This is an exploded structural diagram of the motor structure of the present invention;

[0021] Figure 5 This is a cross-sectional view of the motor structure of the present invention;

[0022] 1 is the front cover, 2 is the rotor assembly, 3 is the stator assembly, 4 is the rear cover assembly, 5 is the printed circuit board assembly with magnetic braided chip, 6 is the permanent magnet, and 7 is the wire box.

[0023] 21 is the front bearing, 22 is the rear bearing, 23 is the shaft, 231 is the first step of the shaft, and 232 is the second step of the shaft.

[0024] 31 is the housing, 32 is the stator core, 33 is the winding, 34 is the insulating support, 35 is the printed circuit board, 36 is the pin, 37 is the insulating sleeve, and 38 is the circuit board assembly.

[0025] 41 is the rear end cover, 411 is the rear end cover bearing chamber, 412 is the mounting surface, and 413 is the inner stop.

[0026] 51 is a printed circuit board with a magnetically encoded chip, 52 is a mounting bracket, 511 is the outer contour of the chip encapsulation, 512 is the chip end face, 515 is a power line hole, 521 is the inner contour, 522 is the mounting bracket plane, 523 is the outer circular surface, 524 is the end face, and 525 is the wire guide groove. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0028] like Figure 4 As shown, a magnetic encoder motor structure based on chip outer contour positioning is disclosed. The motor structure includes a front cover 1, a rotor assembly 2, a stator assembly 3, a rear cover assembly 4, a printed circuit board assembly 5 with a magnetic encoder chip, a permanent magnet 6, and a wire box 7. The printed circuit board assembly 5 with the magnetic encoder chip includes a printed circuit board 51 with a magnetic encoder chip and a mounting bracket 52. The printed circuit board 51 with the magnetic encoder chip is in clearance fit with the inner contour 521 of the mounting bracket 52 through the chip-encapsulated outer contour 511.

[0029] In this structure, the front bearing 21 of the rotor assembly 2 is installed in the bearing chamber of the front end cover 1, and the rear bearing 22 is installed in the bearing chamber 411 of the rear end cover 41. The stator assembly 3 is positioned with the front and rear stops of the housing 31 respectively on the mounting surfaces of the front end cover 1 and the rear end cover 41. In the stator assembly 3, the stator core 32 is interference-fitted and fixed to the housing 31, and the winding 33 is positioned by tooling and bonded to the stator core 32. The pins 36 at three locations are first welded to the printed circuit board 35 to form a circuit board assembly 38. The circuit board assembly 38 is heat-fitted to the insulating bracket 34, and the rear end face is connected to the stator core 35. The rear end face of the core 32 is bonded, and the outer circular surface is bonded to the inner circular surface of the housing 31. The lead wire of the winding 33 is soldered to the printed circuit board 35. At this time, the lead wire of the winding 33 is connected to the pins 36 at three locations through the printed circuit board 35. The insulating sleeves 37 are sleeved on the surface of the pins 36 at three locations. Heating causes the insulating sleeves 37 to shrink and hold the pins 36 tightly. When the stator assembly 3 and the rear end cover assembly 4 are installed, the pins 36 at three locations pass through the rear end cover 41 under the protection of the insulating sleeves 37. The permanent magnet 6 is positioned and installed at the tail of the rotating shaft 23 by tooling to ensure the concentricity of the permanent magnet 6 and the mounting surface 412 of the rear end cover 41.

[0030] The printed circuit board 51 with magnetically encoded chips (with soldered wire harness) is encapsulated by the chip's outer contour 511 (square in this example, e.g.) Figure 1 The chip end face 512 is fitted with the inner contour 521 of the mounting bracket 52, and then glued in the glue dispensing groove to fix it, forming a printed circuit board assembly 5 with a magnetically encoded chip (during installation, it is necessary to ensure that the wire guide groove 525 on the mounting bracket 52 is aligned with the power line hole 515). The printed circuit board assembly 5 with the magnetically encoded chip is fitted with the inner stop 413 of the rear end cover 41 through the outer circular surface 523 of the mounting bracket 52, and the end face 524 of the mounting bracket 52 is fitted with the mounting surface 412 of the rear end cover and glued to fix it. During installation, the pins 36 at 3 locations pass through the mounting bracket 5. The wire guide 525 on the upper part and the power wire hole 515 on the printed circuit board 51 with magnetic braided chip are connected. Then, the pin 36 is soldered to the power wire hole 515 on the printed circuit board 51 with magnetic braided chip to make it conductive. The wire box 7 is installed on the rear end cover 41, and filler is added to the tail cavity formed by the printed circuit board 51 with magnetic braided chip and the wire box 7 to fix and protect the components and wire harness on the printed circuit board 51 with magnetic braided chip, thus completing the assembly of the motor.

[0031] In this invention, the inner contour 521 on the mounting bracket 52 needs to have good concentricity with the outer circular surface 523, and the rear end cover bearing chamber 411 needs to have good concentricity with the outer circular surface 523 of the mounting bracket.

[0032] In this invention, the mounting bracket 52 mates with the outer contour 511 of the chip encapsulation on the printed circuit board 51 with the encoder chip via its inner contour 521. Furthermore, the inner contour 521 and the outer circular surface 523 of the mounting bracket 52 have good concentricity. Specifically, as shown... Figure 3 As shown, the radially extending outer circular surface 523 and the inner contour 521 share two axes of symmetry A and B ( Figure 3 The intersection of the two surfaces has good concentricity, so the chip and the outer circular surface 523 of the mounting bracket have good concentricity. Then, the outer circular surface 523 of the mounting bracket 52 and the inner stop 413 of the rear end cover 41 are matched. The bearing chamber 411 of the rear end cover needs to have good concentricity with the outer circular surface 523 of the mounting bracket, so the chip and the bearing chamber 411 of the rear end cover have good concentricity. The concentricity of the bearing and the shaft in the motor is controllable, and the concentricity of the inner and outer circles of the permanent magnet 6 is controllable, so the concentricity of the chip and the permanent magnet 6 is controllable.

[0033] The present invention imposes precision requirements on the hinge, rear end cover, mounting bracket, and permanent magnet, but does not impose requirements on the dimensional accuracy of the printed circuit board; the existing market has mature capabilities to ensure the precision of the hinge, rear end cover, mounting bracket, and permanent magnet.

[0034] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A magnetic encoder motor structure based on chip outer contour positioning, the motor structure comprising a front cover (1), a rotor assembly (2), a stator assembly (3), a rear cover assembly (4), a printed circuit board assembly with a magnetic encoder chip (5), a permanent magnet (6), and a wire box (7), characterized in that, The printed circuit board assembly (5) with magnetic braided chip includes a printed circuit board (51) with magnetic braided chip and a mounting bracket (52). The printed circuit board (51) with magnetic braided chip is fitted with the inner contour (521) of the mounting bracket (52) through a gap fit between the outer contour (511) of the chip encapsulation and the inner contour (521) of the mounting bracket (52). The outer circular surface (523) of the mounting bracket (52) is clearance-fitted with the inner stop (413) of the rear end cover (41) in the rear end cover assembly (4), and the end face (524) of the mounting bracket (52) is attached to the mounting surface (412) of the rear end cover (41) and fixed with adhesive. The inner contour (521) and outer circular surface (523) of the mounting bracket (52) are concentrically arranged; the outer circular surface (523) of the mounting bracket (52) is concentrically arranged with the rear end cover bearing chamber (411) of the rear end cover (41) by cooperating with the inner stop (413) of the rear end cover (41); the rear end cover bearing chamber (411) and the inner stop (413) of the rear end cover (41) are concentrically arranged.

2. The magnetic encoder motor structure based on chip outer contour positioning according to claim 1, characterized in that, The inner contour (521) of the mounting bracket (52) has a shape similar to the outer contour of the chip encapsulation, specifically a square shape.

3. The magnetic encoder motor structure based on chip outer contour positioning according to claim 1, characterized in that, The chip end face (512) of the printed circuit board (51) with magnetic chip is attached to the mounting plane (522) of the mounting bracket (52) and fixed by dispensing glue in the dispensing groove.

4. The magnetic encoder motor structure based on chip outer contour positioning according to claim 1, characterized in that, The printed circuit board (51) with magnetic braided chip is provided with a power line hole (515), and the mounting bracket (52) is provided with a wire groove (525) aligned with the power line hole (515).

5. The magnetic encoder motor structure based on chip outer contour positioning according to claim 4, characterized in that, The stator assembly (3) includes a pin (36) that passes through a wire groove (525) and a power wire hole (515) and is soldered to the power wire hole (515) for conduction.

6. The magnetic encoder motor structure based on chip outer contour positioning according to claim 1, characterized in that, The rotor assembly (2) includes a shaft (23) with shaft step one (231) and shaft step two (232) arranged concentrically, and the permanent magnet (6) has inner and outer circles arranged concentrically.

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