A coreless and frameless winding motor

Abstract

A coreless and frameless winding motor comprises: a housing, a stator assembly, a rotor assembly and an end cover. The stator assembly is composed of a formed circular ring winding coil, and the stator assembly is sleeved in the housing, and is directly supported and fixed by the motor housing as a frame. The rotor assembly is sleeved in the ring of the stator assembly, and the rotor assembly comprises: a permanent magnet, an axis core and a positioning ring, the axis core is inserted into the permanent magnet, the positioning ring is sleeved at both ends of the axis core, the positioning ring at the upper end of the axis core cooperates with the positioning hole at the top of the stator assembly, and the positioning ring is used to fix the axial size; the end cover is arranged at the top of the stator assembly. The stator coil of the present application is fixed without an iron core, and each turn of the coil is arranged into a closed ring, and multiple groups of coils form a cylindrical winding, which can not only simply fix the winding coil, but also directly reduce the space occupied by the iron core, thereby reducing the outer diameter of the motor, reducing the cost of the motor, and realizing the miniaturization of the motor.

Description

Technical Field

[0001] The present application relates to the technical field of electric motors, and in particular to an iron-coreless and frameless winding electric motor. Background Art

[0002] The existing hollow cup brushless motor uses a frame to fix the cup-shaped coil, which is difficult to miniaturize in terms of spatial structure and has certain limitations on the outer diameter of the motor. The present invention designs a motor without a frame, without an iron core, with a small radial dimension, which runs smoothly and has high efficiency. Compared with the motor with an iron core, it has the characteristics of small size, light weight, compact structure, high reliability and durability. Hollow cup motors are generally used in medical equipment and communication equipment, such as medical injection pumps, medical teeth grinding machines and surveillance cameras, which give it a wide range of applications. Summary of the invention

[0003] The present application provides an ironless and frameless winding motor, which aims to reduce the motor diameter and reduce the motor cost.

[0004] The present application provides an ironless coreless winding motor, comprising:

[0005] shell,

[0006] The stator assembly is composed of a formed circular ring coil, and the stator assembly is sleeved in the housing and directly supported and fixed by the motor housing as a frame;

[0007] A rotor assembly, wherein the rotor assembly is sleeved in the annular ring of the stator assembly, and the rotor assembly comprises: a permanent magnet, an axis core and a positioning ring, wherein the axis core is inserted into the permanent magnet, and the positioning ring is sleeved at both ends of the axis core, and the positioning ring at the upper end cooperates with the positioning hole at the top of the stator assembly;

[0008] The end cover is arranged on the top of the stator assembly.

[0009] In some embodiments, the circular winding coil of the stator assembly is composed of multiple groups of coils, and two groups of coils can form a stator of a two-phase motor, or 3n groups of coils can form a three-phase motor, or 4n groups of coils can form a four-phase motor.

[0010] In some embodiments, the outer wall of the winding coil may be insulated and protected by coating with conformal coating, or wrapped with high temperature adhesive tape, or an insulating layer may be electroplated on the inner wall of the shell.

[0011] In some embodiments, the outer wall of the winding coil is formed by flattening the entire circle with the aid of glue.

[0012] In some embodiments, the stator assembly further includes a PCB board or a PCBA disposed on the upper portion of the circular ring assembly coil.

[0013] In some embodiments, the PCB board is a hard board or a soft board FPC, and IC and electronic components are arranged on the hard board or the soft board FPC to form a PCBA.

[0014] In some embodiments, the housing is a multi-stage cup-shaped structure, and a bearing may be provided at the bottom of the housing.

[0015] In some embodiments, the end cover is made of plastic or metal, and a bearing can be provided on the top of the end cover; the rubber cover is formed by injection molding and fixed integrally with the oil-containing bearing.

[0016] In some embodiments, the permanent magnet is a ring structure, the shaft core is inserted into the inner hole of the permanent magnet, and the permanent magnet is connected and fixed to the shaft core.

[0017] In some embodiments, the permanent magnet uses AlNiCo, SmCo, or NdFeB.

[0018] According to the above embodiment, the stator coil of the present application is fixed without an iron core, and each turn of the coil is arranged into a closed ring. The coils are fixed to each other with glue to form a cylindrical winding. The outer ring of the winding is wrapped with high-temperature adhesive tape and then directly inserted into the outer shell. This method can not only simply fix the winding coil, but also directly reduce the space occupied by the iron core, thereby reducing the outer diameter of the motor, reducing the cost of the motor, and realizing the miniaturization of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A disassembled diagram of an ironless and frameless winding motor according to an embodiment;

[0020] Figure 2 A cross-sectional view of an ironless coreless and frameless winding motor according to an embodiment;

[0021] Figure 3 A schematic diagram of a rotor assembly of an ironless coreless and frameless winding motor according to an embodiment;

[0022] Figure 4 A schematic diagram of a stator assembly and a housing of an ironless coreless and frameless winding motor according to an embodiment;

[0023] Figure 5 The figure is an expanded view of a circular winding coil of a stator assembly according to an embodiment. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below by specific embodiments in conjunction with the accompanying drawings. Wherein similar elements in different embodiments adopt associated similar element numbers. In the following embodiments, many detailed descriptions are for making the present application better understood. However, those skilled in the art can easily recognize that some features can be omitted in different situations, or can be replaced by other elements, materials, methods. In some cases, some operations related to the present application are not shown or described in the specification, this is to avoid the core part of the present application being overwhelmed by too much description, and for those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations according to the description in the specification and the general technical knowledge in the art.

[0025] In addition, the features, operations or characteristics described in the specification can be combined in any appropriate manner to form various implementations. At the same time, the steps or actions in the method description can also be interchanged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the various sequences in the specification and the drawings are only for the purpose of clearly describing a certain embodiment and are not meant to be a required sequence, unless otherwise specified that a certain sequence must be followed.

[0026] The terms “connection” and “coupling” in this application include direct and indirect connections (couplings) unless otherwise specified.

[0027] Please refer to Figure 1-5 The present application provides an ironless and frameless winding motor, comprising: a housing 1, a stator assembly, a rotor assembly and an end cover 2.

[0028] The stator assembly is composed of a formed circular ring coil 7, which is sleeved in the housing 1 and directly supported and fixed by the motor housing 1 as a frame. The rotor assembly is sleeved in the ring of the stator assembly. The rotor assembly includes: a permanent magnet 4, a shaft core 3 and a positioning ring 6. The shaft core 3 is inserted into the permanent magnet 4. The positioning ring 6 is sleeved at both ends of the shaft core 3. The positioning ring 6 at the upper end of the shaft core 3 matches the positioning hole at the top of the stator assembly. The positioning ring 6 is used to fix the axial size. The end cover 2 is set at the top of the stator assembly.

[0029] The stator assembly of the present application is composed of a formed circular ring coil, which is directly supported and fixed by the motor housing 1 as a frame. The motor does not use the silicon steel sheet core used in traditional motors, which simplifies the structure, reduces the size and reduces the cost. The minimum diameter of the brushless DC motor invented in this project can be 7mm, or even smaller.

[0030] In some embodiments, the circular winding coil 7 is composed of multiple groups of coils, and two groups of coils can form a stator of a two-phase motor, or 3n groups of coils can form a three-phase motor, or 4n groups of coils can form a four-phase motor. The copper wire of the coil has a small wire diameter and is wound neatly to reduce the gap between the wires, reduce the thickness of the winding, and reduce the diameter of the motor.

[0031] In some embodiments, the outer wall of the circular winding coil 7 may be insulated and protected by coating with conformal coating, or wrapped with high temperature adhesive tape, or an insulating layer may be electroplated on the inner wall of the shell.

[0032] In some embodiments, the outer wall of the circular winding coil 7 is formed by flattening the entire circle with the aid of glue.

[0033] In some embodiments, the stator assembly further includes a PCB board 8 or PCBA disposed on the upper part of the circular winding coil 7. Specifically, the PCB board 8 is a hard board or a soft board FPC, and an IC and electronic components are disposed on the hard board or the soft board FPC to form a PCBA. The rear end of the winding is connected to a PCB terminal board and pressed into the housing together, and is tightly matched with the housing. The three-phase wires are first soldered on the PCB board and then led out, which prevents the coil from being broken during the use of the motor.

[0034] In some embodiments, the housing 1 is a multi-stage cup-shaped structure, and a bearing 5 may be disposed at the bottom of the housing 1 .

[0035] In some embodiments, the end cover 2 is made of plastic or metal, and a bearing 5 can be set on the top of the end cover 2; the rubber cover is formed by injection molding and fixed integrally with the oil-containing bearing, thereby reducing the motor assembly process and the motor processing cost.

[0036] In some embodiments, the permanent magnet 4 is a ring structure, the shaft core is inserted into the inner hole of the permanent magnet, the inner hole is directly and tightly matched with the shaft core 3, and the two ends of the shaft core 3 are limited by the positioning ring 6. The structure is simple, which can reduce the motor assembly process and reduce labor costs. The permanent magnet 4 can be connected and fixed to the shaft core 3 with glue.

[0037] In some embodiments, the permanent magnet 4 uses AlNiCo, SmCo, or NdFeB.

[0038] The above specific examples are used to illustrate the present invention, which is only used to help understand the present invention and is not intended to limit the present invention. For those skilled in the art, according to the concept of the present invention, some simple deductions, modifications or substitutions can be made.

Claims

1. A coreless and frameless winding motor, characterized in that: include: shell, The stator assembly is composed of a formed circular ring coil, and the stator assembly is sleeved in the housing and directly supported and fixed by the motor housing as a frame; A rotor assembly, wherein the rotor assembly is sleeved in the annular ring of the stator assembly, and the rotor assembly comprises: a permanent magnet, an axis core and a positioning ring, wherein the axis core is inserted into the permanent magnet, and the positioning ring is sleeved at both ends of the axis core, and the positioning ring at the upper end cooperates with the positioning hole at the top of the stator assembly; An end cover, the end cover being arranged on the top of the stator assembly; Each turn of the coil is arranged into a closed ring, and the coils are fixed to each other with glue to form a cylindrical winding. The outer ring of the winding is wrapped with high-temperature adhesive tape and directly inserted into the shell.

2. The motor according to claim 1, characterized in that: The stator assembly circularly surrounds the coils and is composed of multiple groups of coils. Two groups of coils can form a stator of a two-phase motor, or 3n groups of coils can form a three-phase motor, or 4n groups of coils can form a four-phase motor.

3. The motor according to claim 1, characterized in that: The outer wall of the winding coil can be insulated and protected by applying three-proof paint, or wrapped with high-temperature adhesive tape, or an insulating layer can be electroplated on the inner wall of the shell.

4. The motor according to claim 1, characterized in that: The outer wall of the winding coil is formed by flattening the entire circle with the aid of glue.

5. The motor according to claim 1, characterized in that: The stator assembly also includes a PCB board or PCBA arranged on the upper part of the circular ring assembly coil.

6. The motor according to claim 5, characterized in that: The PCB board is a hard board or a soft board FPC, and IC and electronic components are arranged on the hard board or the soft board FPC to form a PCBA.

7. The motor according to claim 1, characterized in that: The shell is a multi-stage cup-shaped structure, and a bearing can be arranged at the bottom of the shell.

8. The motor according to claim 1, characterized in that: The end cover is made of plastic or metal, and a bearing can be arranged on the top of the end cover; the rubber cover is formed by injection molding and is integrally formed and fixed with the oil-containing bearing.

9. The motor according to claim 1, characterized in that: The permanent magnet is a ring structure, the shaft core is inserted into the inner hole of the permanent magnet, and the permanent magnet is connected and fixed to the shaft core.

10. The motor according to claim 1, characterized in that: The permanent magnet may be AlNiCo, SmCo or NdFeB.

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