CN111478541A - Novel coreless motor - Google Patents

Abstract

The present invention is a novel hollow-cup motor, comprising: a stator assembly and a rotor assembly, the stator assembly includes at least one magnetic component; the rotor assembly includes a printed circuit board disposed at both ends of the stator assembly, and soldered to the printed circuit The armature winding on the board, the armature winding includes at least three windings, and the two ends of each of the windings are respectively fixed on the printed circuit board; wherein, each of the windings is in a straight line shape, and is connected with the The rotational centerlines of the rotor assemblies are parallel. The novel hollow cup motor of the present invention makes the self-adhesive enameled wire in the armature winding of the hollow cup motor straight due to the PCB boards arranged at both ends of the rotating shaft. The distribution coefficient can improve the utilization rate of the wire, and then can improve the output performance of the motor.

Description

A new type of hollow cup motor

technical field

The invention relates to the technical field of hollow cup motors, in particular to a novel hollow cup motor.

Background technique

The hollow cup motor adopts an ironless rotor. This rotor structure completely eliminates the power loss caused by the eddy current formed by the iron core, and at the same time, its weight and moment of inertia are greatly reduced, thereby reducing the mechanical energy loss of the rotor itself. Due to the structural change of the rotor, the operating characteristics of the motor have been greatly improved, not only with outstanding energy-saving characteristics, but more importantly, with the control and drag characteristics that iron core motors cannot achieve. Therefore, hollow cup motors are widely used in industrial robots, aircraft and other fields.

The current hollow cup motors mostly use the diamond winding winding as shown in Figure 1, and the block type or winding type is formed into a circular process structure. In the process of processing, a copper wire needs to be wound into hundreds of diagonal lines. Or diamond-shaped broken lines, which are difficult to process and complicated in processing technology, resulting in the defects of uneven arrangement of rotor armature windings, difficult shaping, and large distribution coefficient in the formed hollow cup motor.

Therefore, it is necessary to provide an improved technical solution for the deficiencies of the above-mentioned prior art.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a new type of hollow cup motor, the rotor of the hollow cup motor is neatly arranged inside, the inertia is low, and the distribution coefficient is low, which can improve the output performance of the product, reduce the moment of inertia, and reduce the response speed.

In order to achieve the above object, the present invention provides the following technical solutions:

A new type of hollow cup motor, including:

a stator assembly including at least one magnetic member;

The rotor assembly is rotatably sleeved outside the stator assembly, and the rotor assembly includes:

a printed circuit board, the printed circuit board is disposed at both ends of the stator assembly;

an armature winding, the armature winding is welded on the printed circuit board, the armature winding includes at least three windings, and two ends of each of the windings are respectively fixed on the printed circuit board;

Wherein, each of the windings is linear and parallel to the rotation centerline of the rotor assembly.

Further, the stator assembly further includes a bushing, the bushing is in the shape of a hollow tube, and the bushing is embedded in the magnetic member.

Further, the rotor assembly further includes a rotating shaft, and the rotating shaft is rotatably arranged in the bushing.

Further, the rotor assembly further includes a commutator, the commutator is arranged at one end of the stator assembly, the commutator is fixed between the printed circuit board and the rotating shaft, and is used to change the electrical The direction of current flow in the armature winding.

Further, the printed circuit board is provided with wire grooves and positioning holes, the wire grooves are evenly arranged along the outer circumference of the printed circuit board, and the positioning holes are opened on the inner circumference edge of the printed circuit board for fixing the PCB board.

Further, the printed circuit board includes N layers, and the printed circuit boards of the N layers are connected in parallel, and N≥2.

Further, the winding adopts self-adhesive enameled wire, and the self-adhesive enameled wire is passed through the wire groove of the printed circuit board.

Further, the magnetic member is a magnetic steel, and glue is used for bonding between the magnetic steel and the bushing.

Further, the bushing is connected to the rotating shaft in rolling connection through the bearings on both sides.

Further, the stator assembly, the rotor assembly and the rotating shaft are concentric on the same horizontal plane.

Compared with the prior art, the beneficial effects that the present invention can achieve are:

In the hollow cup motor of the present invention, the self-adhesive enameled wires in the armature windings of the hollow cup motor are linear due to the PCB boards arranged at both ends of the rotating shaft, which can effectively reduce the distribution of the armature windings compared with the rhombus structure in the prior art. coefficient, improve the utilization rate of the wire, and then can improve the output performance of the motor.

The armature winding of the present invention adopts hot-melt (or alcohol) self-adhesive enameled wire. After the winding is completed, the hot-melt paint carried by the self-adhesive enameled wire is melted by heating, and under the action of rotating centrifugal force, the hot-melt The paint is evenly distributed between the windings. After the room temperature hot melt paint is cured, the strength of the motor rotor cup will be greatly increased. Compared with the ordinary enameled wire, the armature winding of the hot melt (or alcohol) self-adhesive enameled wire is used. It can effectively enhance the strength of the middle of the rotor cup of the hollow cup motor. Moreover, after the winding of the hollow cup winding is completed, subsequent shaping is not required, which can ensure the uniformity of the arrangement of the self-adhesive enameled wire inside the armature winding, so that the thickness of the rotor cup can be reduced to a certain extent, so that it can be further improved. The number of windings of the self-adhesive enameled wire inside the rotor cup.

The invention adopts the form of PCB board welding, and the winding wires on both sides of the hollow cup rotor are welded on the pads of the PCB board, and the electrical connection is realized through the inside of the PCB board, which can greatly reduce the resistance of the end and the self-adhesive enameled wire of the end. It can also reduce the weight of the entire hollow cup motor, reduce the moment of inertia of the hollow cup motor, and improve the response speed of the hollow cup motor.

Based on the various effects of the above analysis, it can be seen that the present invention can be applied to the mass production of hollow cup motors with low winding density and large winding wire diameter, thereby improving production efficiency.

Description of drawings

The accompanying drawings forming a part of the present application are used to provide further understanding of the present invention, and the exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. in:

Fig. 1 is the schematic diagram of the rhombus winding structure of the rotor of the existing hollow cup motor;

Fig. 2 is the structural sectional view of the hollow cup motor of the present invention;

3 is a schematic diagram of a linear winding structure of the hollow cup motor of the present invention;

4 is a schematic diagram of the side structure of the PCB board in the hollow cup motor of the present invention;

5 is a schematic diagram of the three-dimensional structure of the PCB board in the hollow cup motor of the present invention;

6 is a schematic diagram of the armature winding tooling and installation of the present invention.

In the figure: 1. Rotating shaft; 2. Magnetic steel; 3. Armature winding; 4. Bushing; 5. Commutator; 6. PCB board; 7. The first winding tool; 8. The second winding tool; 9 , thimble hole; 10, solder joint; 11, positioning hole; 12, line connection structure; 13, self-adhesive enameled wire.

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments. The various examples are provided by way of explanation of the invention and do not limit the invention. In fact, it will be apparent to those skilled in the art that modifications and variations can be made in the present invention without departing from the scope or spirit of the invention. For example, features illustrated or described as part of one embodiment can be used on another embodiment to yield yet another embodiment. Therefore, it is intended that the present invention embrace such modifications and variations as come within the scope of the appended claims and their equivalents.

In the description of the present invention, the terms "portrait", "horizontal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", " The orientations or positional relationships indicated by "top" and "bottom" are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention rather than requiring the present invention to be constructed and operated in a specific orientation, and therefore cannot be understood as Limitations of the present invention. The terms "connected", "connected" and "arranged" used in the present invention should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection; it may be directly connected or indirectly connected through intermediate components; it may be It is a wired electrical connection, a radio connection, or a wireless communication signal connection. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

The structure of the hollow cup motor of the present invention is shown in FIG. 2, including an outer casing, a stator assembly and a rotor assembly; both the stator assembly and the rotor assembly are installed in the outer casing.

The stator assembly includes a magnetic steel 2 and a bushing 4. The magnetic steel 2 and the bushing 4 are assembled. Specifically, the magnetic steel 2 is sleeved on the outer circumferential surface of the bushing 4, and the magnetic steel 2 is axially close to one end of the bushing 4. Setting, the magnetic steel 2 and the bushing 4 are bonded by anaerobic glue. When the magnetic steel 2 is rotated, the anaerobic glue will be evenly distributed between the magnetic steel 2 and the bushing 4, and the bonding will be more firm. In this embodiment, anaerobic glue is used for pasting between the magnetic steel and the bushing. As other implementations, structural glue and epoxy glue can also be selected; the bushing 4 is made of high-strength magnetic conductive material, such as 2Cr13/ 10# steel and other metal materials; magnetic steel 2 is a hollow cylindrical NdFeB magnetic material component. The magnetic steel 2 may be an integrally formed magnetic component, or may be a combined magnetic component including multiple segments of the magnetic steel 2 .

The stator assembly is sleeved on the rotating shaft 1 of the rotor assembly through the bearings assembled in the grooves on both sides of the bushing 4, the magnetic steel 2 is embedded in the hollow part of the rotor, and the rotor assembly is realized through the bearings on both sides of the bushing 4 Rolling connection with stator assembly. The rotor assembly and stator assembly maintain the same concentricity.

The rotor assembly is rotatably sleeved on the stator assembly, and the rotor assembly includes an armature winding 3, a commutator 5 and a pair of printed circuit boards, namely PCB boards 6; a set of PCB boards 6 are respectively arranged on both ends of the rotor assembly , that is, along the two ends of the rotating shaft 1 , it is used to fix and realize the winding tool of the armature winding 3 , and at the same time, it can also connect the armature winding 3 and the commutator 5 to support the armature winding 3 .

The commutator 5 is arranged between the inner circumference of the PCB board 6 and the outer circumference of the rotating shaft 1, the inner circumference of the commutator 5 is tightly connected with the rotating shaft 1, and the outer circumference of the commutator 5 is welded and glued to the armature winding 3. Connection, so that the armature winding 3, the PCB board 6, the commutator 5, and the rotating shaft 1 are connected as a mechanical whole to form a rotor. During the operation of the hollow cup motor, due to the commutation of the commutator 5, the current direction of the armature winding 3 changes, and the hollow cup motor is controlled to work normally under continuous current.

The side structure of the PCB board 6 on both sides of the hollow cup type armature winding is shown in Figure 4. The PCB board 6 includes a positioning hole 11, a line connection structure 12 and a wire slot. The wire slot is arranged along the outer circumference of the PCB board. The self-adhesive enameled wire 13 is passed through, and the circuit connection structure 12 is used to realize the electrical connection in the PCB board. The positioning hole is opened on the inner circumference edge of the PCB board. The fixing of the positioning hole 11 can keep the PCB board 6 and the rotating shaft 1 Concentricity .

The windings of the armature winding 3 are welded to the designated pads of the PCB board 6 by laser welding, and are welded on the solder joints 10 of the PCB board at both ends as shown in Figure 3, so that the armature winding 3 is parallel to the axis of the rotating shaft 1, that is, The armature windings form a linear structure, and the armature windings 3 are arranged at intervals from the outer surface of the magnetic steel 2 and are parallel to the rotation center line of the rotor assembly. A number of self-adhesive enameled wires in the armature winding 3 are welded to the corresponding positions of the PCB board 6 in sequence. The internal electrical grouping of the armature is the same as that of the commutator 5. The armature winding 3 is connected through the circuit connection structure 12 in the PCB to achieve different connections. Way.

Based on the structural features of the rotor assembly described above, the rotor assembly of the present invention is a cylindrical structure with a hollow interior.

Considering the size limitation of actual laser welding, therefore, in the case of a large number of turns, the N-layer PCB board is connected in parallel. The boards are all fixed, so that the N-layer PCB boards are all concentric with the rotating shaft 1. In this implementation, a three-layer PCB board is used, and its three-dimensional three-dimensional structure is shown in Figure 5. The three-layer PCB board is also connected in parallel. Specifically, the three PCB boards are glued together with glue to realize the parallel connection of the PCB boards. Connection is fixed.

The installation of the hollow cup motor of the present invention is to first install the bushing 4, the rotating shaft 1, the magnetic steel 2, the PCB board 6, the first winding tool 7, and the second winding tool 8 on the machine tool; then perform the following specific steps:

(1) Installation of stator assembly: The stator assembly is an assembly assembled from the magnetic steel 2 and the bushing 4. Since the through holes on both sides of the armature winding of the hollow cup motor structure are small, it can only be carried out when the armature winding is carried out. Before winding, first install the internal stator components in place; specifically, first fix the bushing 4 with the shaft 1 through the bearings on both sides, and then glue the magnetic steel 2 on the bushing 4, so as to realize the first Internal installation of the stator assembly.

(2) Rotor assembly installation: as shown in Figure 6, firstly use the first winding tool 7 and the second winding tool 8 to support the PCB boards 6 on both sides of the stator assembly, and ensure the shape and position of each component Tolerance; there are positioning holes 11 on both sides of the second winding tool 8, and the PCB boards 6 at both ends are fixed to the machine tool through the thimble holes 9 by a thimble, and then the PCB board 6 is fixedly installed through the positioning holes 11, and the two ends are The concentricity between the PCB board 6 and the rotating shaft 1 .

(3) Winding installation: After the above-mentioned rotor assembly is fixedly installed on the machine tool, and then control the machine tool to rotate at a constant speed according to the tool turning direction as shown in Figure 6, it can ensure the uniform and neat arrangement of the self-adhesive enameled wire inside one winding. When the tooling is in place, the windings are stretched and fixed into the wire grooves of the PCB boards at both ends and welded; after completion, run to the next position and repeat the above steps; after completing one layer of the PCB board, cut off the excess self-adhesive enameled wire , and shape the solder joints, start to install the next layer of PCB board, and continue winding;

(4) The rotor component is cured and shaped: after the winding is completed, the component is placed on the rotating platform, and the self-adhesive enameled wire is heated, and the melted self-adhesive paint does not enter the air gap in the motor by centrifugal force. After curing, it is placed on the outer circle of the cup-shaped armature winding Increase the glass fiber epoxy reinforcement layer to improve the overall mechanical strength;

(5) Assembly: first remove the second winding tooling, and install the rotating shaft 1 and the commutator 5 at the position of the second winding tooling 8. As another embodiment, the second winding tooling 8 can directly use the rotating shaft 1 Instead, correspondingly, after winding, shaping and welding, only the commutator 5 can be installed directly at the corresponding position. Then apply glue between the parts to tighten the fixed type, and then remove the first winding tool 7 after fixing and forming, until the overall size is processed in place and passed the inspection, and all installations are completed.

In the present invention, each component is installed according to the above steps, and during installation, attention is always paid to the installation position to ensure the concentricity of each component and the rotating shaft 1 . If there are many windings, more layers of PCB boards can be used. The installation method of the subsequent layers is the same as that of the first layer, and the relative position of the winding installation is determined according to the actual design requirements.

Based on the above-mentioned record description, it can be seen that the above-mentioned embodiments of the present invention have achieved the following technical effects:

The self-adhesive enameled wire inside the hollow cup armature is straight, not the ordinary diamond structure, which can effectively reduce the winding distribution coefficient, improve the utilization rate of the wire, and thus improve the output performance of the motor. At the same time, the structure can enhance the strength of the middle part of the rotor cup;

After the winding of the hollow cup winding is completed, there is no subsequent shaping step, which can improve the uniformity of the internal winding arrangement of the armature, reduce the thickness of the rotor cup to a certain extent, and increase the number of self-adhesive enameled wires inside the rotor cup;

The winding wiring on both sides of the hollow cup rotor is in the form of PCB board welding, and the two wires on the opposite side of the armature are connected through the internal wiring of the PCB board, which greatly reduces the end resistance and the size of the self-adhesive enameled wire at the end, and the material of the PCB board The density is much smaller than that of copper wire, and this structure can also reduce the gravity of the entire rotor cup and the moment of inertia, which is beneficial to improve the response speed of the hollow cup motor.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. a novel hollow cup motor, is characterized in that, comprises: a stator assembly including at least one magnetic member; The rotor assembly is rotatably sleeved outside the stator assembly, and the rotor assembly includes: a printed circuit board, the printed circuit board is disposed at both ends of the stator assembly; an armature winding, the armature winding is welded on the printed circuit board, the armature winding includes at least three windings, and two ends of each of the windings are respectively fixed on the printed circuit board; Wherein, each of the windings is linear and parallel to the rotation centerline of the rotor assembly. 2 . The novel hollow-cup motor according to claim 1 , wherein the stator assembly further comprises a bushing, the bushing is in the shape of a hollow tube, and the bushing is embedded in the magnetic member. 3 . 3 . The novel hollow cup motor according to claim 2 , wherein the rotor assembly further comprises a rotating shaft, and the rotating shaft is rotatably arranged in the bushing. 4 . 4 . The novel hollow-cup motor according to claim 3 , wherein the rotor assembly further comprises a commutator, the commutator is arranged at one end of the stator assembly, and the commutator is fixed on the Between the printed circuit board and the rotating shaft, it is used to change the current direction of the armature winding. 5 . The new type of hollow cup motor according to claim 1 , wherein a wire groove and a positioning hole are provided on the printed circuit board, the wire groove is evenly arranged along the outer circumference of the printed circuit board, and the positioning hole is opened. 6 . On the inner circumference edge of the printed circuit board, it is used to fix the PCB board. 6 . The novel hollow cup motor according to claim 1 , wherein the printed circuit board comprises N layers, and the printed circuit boards of the N layers are connected in parallel, and N≧2. 7 . 7 . The novel hollow cup motor according to claim 1 , wherein the winding adopts self-adhesive enameled wire, and the self-adhesive enameled wire is passed through the wire groove of the printed circuit board. 8 . 8 . The novel hollow cup motor according to claim 2 , wherein the magnetic member is a magnetic steel, and glue is used for bonding between the magnetic steel and the bushing. 9 . 9 . The novel hollow cup motor according to claim 4 , wherein the bushing is connected to the rotating shaft in rolling connection through the bearings on both sides. 10 . 10 . The novel hollow cup motor according to claim 3 , wherein the stator assembly, the rotor assembly and the rotating shaft are concentric on the same horizontal plane. 11 .

Images