CN110829676A

CN110829676A - Injection molding stepping motor

Info

Publication number: CN110829676A
Application number: CN201810924264.4A
Authority: CN
Inventors: 彭光明; 金万兵; 张喜臣; 林聪明
Original assignee: Shanghai Moons Electric Co Ltd
Current assignee: Shanghai Moons Electric Co Ltd
Priority date: 2018-08-14
Filing date: 2018-08-14
Publication date: 2020-02-21

Abstract

The invention relates to an injection molding stepping motor which comprises a stator part, a rotor part, an injection molding front end cover, an injection molding rear end cover, a front bearing chamber, a rear bearing and a rear bearing chamber, wherein the rotor part is arranged in the stator part, two ends of a rotating shaft of the rotor part are respectively connected with the front bearing and the rear bearing, the front bearing is arranged in the front bearing chamber, the rear bearing is arranged in the rear bearing chamber, the injection molding front end cover and the injection molding rear end cover are respectively arranged at two ends of the stator part, the motor further comprises a front lining ring and a rear lining ring, the front lining ring is arranged on an installation surface of the injection molding front end cover, the rear lining ring is arranged on an installation surface of the rear lining ring, and the front lining ring and the rear lining ring are metal lining rings. Compared with the prior art, the invention has the advantages of preventing the stator and the rotor from rubbing and sweeping the chamber in the running process of the motor, greatly improving the quality of the motor and the like.

Description

Injection molding stepping motor

Technical Field

The invention relates to a stepping motor, in particular to an injection molding stepping motor.

Background

The prior injection molding stepping motor structure is shown in fig. 1-3, and comprises a stator part 1, a rotor part 2, an injection molding front end cover 3, an injection molding rear end cover 4, a front bearing 5, a front bearing chamber 6, a rear bearing 7 and a rear bearing chamber 8, wherein the rotor part 2 is arranged in the stator part 1, and two ends of a rotating shaft of the rotor part 2 are respectively connected with the front bearing 5 and the rear bearing 7.

In the prior art injection molded motor, the stator part 1 includes a stator core 11, a stator frame 12 and a core winding 13, as shown in fig. 4. After the stator part is finished, injection molding is carried out on the front and the back of the stator part, and as shown in fig. 5, the front and the back injection end covers of the motor and the stator part are integrally injected to form an injection molded stator part.

A front bearing 5 and a rear bearing 7 of the motor are respectively arranged in a front bearing chamber 6 and a rear bearing chamber 8 (the front and rear bearing chambers are made of aluminum or iron), the front and rear bearing chambers are matched with injection-molded front and rear end covers, and the matching precision of the motor stator and rotor installation depends on the matching of the front and rear bearing chambers with the injection-molded front and rear end covers. Because the material of front and back bearing room is the metal, the processing property is better, can guarantee very high tolerance, usually at 0 ~ 0.005mm, so the precision of installation cooperation lies in the internal diameter and the tolerance of end cover before moulding plastics.

After the stator part is finished, the inner diameter of the stator core is used for positioning, a front end cover 3 and a rear end cover 4 of a motor are injected at the front end and the rear end of the stator part 1, as shown in fig. 6, the inner diameter of the stator core is phi 1, the inner diameters of the front injection end cover and the rear injection end cover after injection are phi 2, the inner diameter of the stator is required to be honed to ensure the size and consistency of an air gap because the air gap of a stepping motor is smaller and is generally 0.04-0.05 mm, the whole injection-molded stator part is honed, the inner diameter of the honed stator is phi, the injection-molded front end cover and the injection-molded rear end cover are made of plastic, nylon or resin, and the like, because the hardness of the materials is not high, when a honing rod is used for high-speed cutting, the honing rod has good cutting effect on the plastic, nylon or resin and the like, and can generally generate large extrusion and, and the tolerance of the inner diameters of the front and rear injection molding end covers is within 0-0.1 mm, so that the mounting fit size of the front and rear bearing chambers is not well determined, the problem of non-concentricity of the mounting of the front and rear bearings is caused, the air gap of the motor is not uniform, and the positioning torque is overlarge. Seriously, when the motor runs at high temperature, the chamber sweeping phenomenon caused by the rubbing of the stator and the rotor can be caused, and the motor has great hidden quality trouble.

Disclosure of Invention

The present invention is directed to overcoming the above-mentioned drawbacks of the prior art and providing an injection molding stepping motor.

The purpose of the invention can be realized by the following technical scheme:

the utility model provides a step motor moulds plastics, includes stator part, rotor part, moulds plastics the front end housing, moulds plastics rear end cap, front bearing room, rear bearing and rear bearing room, the rotor part dress in stator part, the pivot both ends of rotor part be connected with front bearing and rear bearing respectively, front bearing arrange in the front bearing room, the rear bearing arrange in the rear bearing room, the front end housing of moulding plastics, the rear end housing of moulding plastics establish respectively at stator part both ends, the motor still include preceding neck ring and back neck ring, preceding neck ring arrange in the installation face of moulding plastics the front end housing on, back neck ring arrange in the installation face of back neck ring on, preceding neck ring and back neck ring be the metal neck ring.

Preferably, the metal lining ring is an aluminum lining ring.

Preferably, the metal lining ring is an iron lining ring.

Preferably, the metal lining ring is a lining ring with the thickness of 0.5-2 mm.

Preferably, the inner diameter of said metal liner ring corresponds to the inner diameter of the stator part.

Preferably, the stator component comprises a stator core, a stator framework and a core winding, and the outer diameter of the metal lining ring is consistent with the inner diameter of the stator framework.

Compared with the prior art, the invention has the following advantages:

the metal inner lining rings are arranged in the front and rear injection molding end covers of the motor, so that the precision of the matching size of the bearing mounting surfaces of the front and rear end covers is improved after the injection molding motor stator is honed, the phenomena of rubbing and chamber sweeping of a stator and a rotor in the operation process of the motor are prevented, and the quality of the motor is greatly improved.

Drawings

FIG. 1 is a schematic front view of a conventional injection molding motor;

FIG. 2 is a schematic perspective view of a conventional injection molding motor;

FIG. 3 is a schematic diagram of an exploded structure of a conventional injection-molded motor;

FIG. 4 is a schematic view of an exploded structure of a stator part of a prior injection molded motor;

FIG. 5 is a schematic perspective view of a stator component of a conventional injection molded motor;

FIG. 6 is a schematic cross-sectional view of a stator component of a prior injection molded motor;

FIG. 7 is a schematic view of an exploded view of a stator component of the injection molded motor of the present invention;

FIG. 8 is a schematic perspective view of a stator component of the injection molded motor of the present invention;

FIG. 9 is a schematic cross-sectional view of a stator component of the injection molded motor of the present invention;

wherein 1: a stator component; 2: a rotor component; 3: injection molding a front end cover; 4: injection molding a rear end cover; 5: a front bearing; 6: a front bearing chamber; 7: a rear bearing; 8: a rear bearing chamber; 9: a front inner liner ring; 10: a rear inner liner ring; 11: a stator core; 12: a stator frame; 13: and a stator winding.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.

In order to improve the dimensional accuracy of the injection-molded front and rear end covers after honing as much as possible, ensure that the installation fit tolerance of the motor is within a controllable range and improve the quality of the motor, as shown in fig. 7, the injection-molded stepping motor comprises a stator part 1, a rotor part 2, an injection-molded front end cover 3, an injection-molded rear end cover 4, a front bearing 5, a front bearing chamber 6, a rear bearing 7, a rear bearing chamber 8, a front lining ring 9 and a rear lining ring 10, wherein the rotor part 2 is arranged in the stator part 1, two ends of a rotating shaft of the rotor part 2 are respectively connected with the front bearing 5 and the rear bearing 7, the front bearing 5 is arranged in the front bearing chamber 6, the rear bearing 7 is arranged in the rear bearing chamber 8, the injection-molded front end cover 3 and the injection-molded rear end cover 4 are respectively arranged at two ends of the stator part 1, the front lining ring 9 is arranged on the installation surface of the injection-molded front end cover 3, the rear lining ring, the front lining ring 9 and the rear lining ring 10 are both metal lining rings.

In the injection molding stator part of the new scheme, metal lining rings are arranged on the mounting surfaces of front and rear injection molding end covers in the original scheme, the lining rings are used as the matching surfaces for mounting front and rear bearing chambers, the metal lining rings are made of aluminum or iron and have the thickness of 0.5-2.0 mm, preferably 1mm, the placement positions of the metal lining rings are shown in figures 8 and 9, the inner diameter of the lining rings is basically consistent with the inner diameter of a stator in consideration of the injection molding process of a motor, and the outer diameter of the lining rings is in contact with the inner diameter of a framework.

After the stator part finishes injection molding, the whole honing of the stator part, the inner diameter of the honed stator is phi, because the inner diameters of the metal inner lining ring and the stator core are metal, the honing rod has a good cutting effect on the metal, after the honing is finished, the same inner diameter phi and the same tolerance of the metal inner lining ring and the stator core can be ensured to be 0-0.005 mm, when the stator and the rotor of the stepping motor are assembled, the good installation effect can be obtained, the stator and the rotor in the operation process can be greatly controlled due to the fact that the stator and the rotor are rubbed and swept, and the quality of the motor is greatly improved.

While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a step motor moulds plastics, includes stator part (1), rotor part (2), the front end housing (3) of moulding plastics, back end housing (4), front bearing (5), front bearing room (6), back bearing (7) and back bearing room (8) mould plastics, rotor part (2) adorn in stator part (1), the pivot both ends of rotor part (2) be connected with front bearing (5) and back bearing (7) respectively, front bearing (5) arrange in front bearing room (6), back bearing (7) arrange in back bearing room (8), the front end housing (3) of moulding plastics, back end housing (4) of moulding plastics establish respectively in stator part (1) interior both ends, its characterized in that, the motor still include preceding interior backing ring (9) and back backing ring (10), preceding interior backing ring (9) arrange in on the installation face of front end housing (3) of moulding plastics, the rear lining ring (10) is arranged on the mounting surface of the rear lining ring (10), and the front lining ring (9) and the rear lining ring (10) are both metal lining rings.

2. An injection molded stepper motor as claimed in claim 1, wherein the metal inner liner ring is an aluminum inner liner ring.

3. An injection molded stepper motor as claimed in claim 1, wherein the metal inner bushing ring is an iron inner bushing ring.

4. An injection molded stepper motor as claimed in claim 1, wherein the metal inner liner ring is a 0.5-2mm thick inner liner ring.

5. An injection moulded stepper motor according to claim 1, wherein the inner diameter of the metal liner ring corresponds to the inner diameter of the stator part (1).

6. An injection moulded stepper motor according to claim 1, wherein the stator part (1) comprises a stator core (11), a stator frame (12) and core windings (13), and the outer diameter of the metal liner ring corresponds to the inner diameter of the stator frame (12).