阅读说明：本技术 一种双定子杯式转子电机 (Double-stator cup type rotor motor ) 是由 欧阳斌 李配飞 刘勇 李德南 马名中 郭威 李鹏飞 张成亮 于 2021-08-02 设计创作，主要内容包括：本发明采用的技术方案是：一种双定子杯式转子电机,包括外定子、内定子和空心杯式转子；外定子包括外定子铁芯和外定子绕组；内定子包括内定子铁芯；所述外定子铁芯、内定子铁芯和空心杯式转子均为环形结构且三者同轴套接设置；空心杯式转子设置于外定子铁芯和内定子铁芯之间；外定子绕组均匀设置于外定子铁芯内壁表面。本发明解决了转矩需求大、转子机械惯性要求低的难题。(The technical scheme adopted by the invention is as follows: a double-stator cup type rotor motor comprises an outer stator, an inner stator and a hollow cup type rotor; the outer stator comprises an outer stator iron core and an outer stator winding; the inner stator comprises an inner stator iron core; the outer stator iron core, the inner stator iron core and the hollow cup type rotor are all of annular structures and are coaxially sleeved; the hollow cup type rotor is arranged between the outer stator iron core and the inner stator iron core; the outer stator winding is uniformly arranged on the surface of the inner wall of the outer stator core. The invention solves the problems of large torque requirement and low mechanical inertia requirement of the rotor.)

1. The utility model provides a two stator cup formula rotor electric machines which characterized in that: comprises an outer stator, an inner stator and a hollow cup type rotor; the outer stator comprises an outer stator iron core and an outer stator winding; the inner stator comprises an inner stator iron core; the outer stator iron core, the inner stator iron core and the hollow cup type rotor are coaxially sleeved; the hollow cup type rotor is arranged in a gap between the outer stator and the inner stator iron core.

2. A double stator cup rotor machine according to claim 1, wherein: the stator comprises an inner stator iron core and an outer stator winding, wherein the inner stator winding is arranged in a stator groove of the inner stator iron core; the inner stator winding adopts the same winding structure as the outer stator winding; the inner stator winding is spatially arranged in the same phase as the outer stator winding.

3. A double stator cup rotor machine according to claim 1, wherein: the inner wall of the outer stator core is circumferentially provided with uniform outer stator slots; the outer stator winding is two-phase, three-phase or multi-phase winding, and is evenly embedded in the outer stator slot.

4. A double stator cup rotor machine according to claim 2, wherein: the outer wall of the inner stator iron core is provided with uniform inner stator slots along the circumference; the inner stator winding is two-phase, three-phase or multi-set multi-phase winding, and is evenly embedded in the inner stator slot.

5. A double stator cup rotor machine according to claim 1, wherein: a circle of uniform air gap is formed between the outer stator and the inner stator, the rotating magnetic field of the outer stator and the rotating magnetic field of the inner stator are synchronous and in phase, and are mutually coupled by penetrating through the air gap to generate electromagnetic torque.

6. A double stator cup rotor machine according to claim 1, wherein: a uniform gap exists between the outer wall of the hollow cup type rotor and the inner wall of the outer stator core, and the gap is called as an outer gap; a uniform gap is also formed between the inner wall of the hollow cup type rotor and the outer wall of the inner stator iron core, and the gap is called as an inner gap; the outer gap is larger than the inner gap.

7. A double stator cup rotor machine according to claim 1, wherein: the device also comprises a hub; one end of the hollow cup type rotor is fixedly connected with the outer wall of the hub; the inner wall of the hub is fixedly connected with the motor rotating shaft.

8. A double stator cup rotor machine according to claim 7, wherein: the hollow cup type rotor and the hub form a synchronously rotating whole, and the rotating shaft is supported by a bearing.

9. A double stator cup rotor machine according to claim 1, wherein: the hollow cup type rotor axially extends out of the end faces of the two sides of the outer stator iron core and the inner stator iron core.

10. A double stator cup rotor machine according to claim 2, wherein: leading-out wires of phase windings corresponding to the inner stator winding and the outer stator winding are connected in series or in parallel; when the phase windings are connected in series, the negative lead-out wire of the phase winding of the outer stator winding is connected with the positive lead-out wire of the corresponding phase winding of the inner stator winding; when the phase windings are connected in parallel, the positive outgoing line of the phase winding of the outer stator winding is connected in parallel with the positive outgoing line of the phase winding corresponding to the inner stator winding, and the negative outgoing line of the phase winding of the outer stator winding is connected in parallel with the negative outgoing line of the phase winding corresponding to the inner stator winding.

Technical Field

The invention belongs to the technical field of motors, and particularly relates to a double-stator cup type rotor motor.

Background

The motor is a device for realizing conversion between mechanical energy and electric energy, and the motor operates as a generator when the mechanical energy is converted into the electric energy and operates as a motor when the electric energy is converted into the mechanical energy; the motion form of the electromechanical energy conversion of the rotating motor is rotary motion, and the motion form of the electromechanical energy conversion of the linear motor is rotary motion. The electric motor has been advanced to various aspects of production and life, such as various squirrel cage or wound induction motors for hoisting equipment, various salient pole and non-salient pole synchronous generators of hydraulic or thermal power plants, various permanent magnet motors for electric vehicles, and the like. Without the wide application of the motor, the high efficiency of modern production and the high convenience of modern life are not available.

The conventional rotating electric machine rotor adopts an inner rotor structure, and not only conductor loops or permanent magnets for carrying current are arranged on the rotor, but also an iron core made of a magnetic conductive material is arranged on the rotor to serve as a magnetic field passage. The structure leads the mechanical inertia of the rotor to be relatively large, and the torque density of the unit moment of inertia is usually difficult to exceed 400rad/s ^2, and is generally in the range of 30-300 rad/s ^ 2.

The utility model patent CN 206023523U discloses an asynchronous tachogenerator of hollow rotor cup, has arranged excitation winding and output winding on the inner stator, and it has the notch to open on the outer stator, and the notch aligns with the output winding of inner stator to alleviate the problem that the residual voltage is higher than usual of the asynchronous tachogenerator of traditional hollow rotor cup existence. The asynchronous tachogenerator of coreless rotor including this utility model is little special motor, and essence belongs to the sensing and detects technical field for detect the rotational speed of rotation axis, this type of tachogenerator have only arranged excitation winding and output winding, can't form rotating magnetic field, also can't be used for electromechanical energy conversion technical field, more can't be used for producing the occasion that the electromechanical energy conversion was accomplished to the big torque.

The invention patent CN 108880093A discloses a hollow rotor driving motor, the rotor is a hollow structure, the hollow rotor is composed of an aluminum alloy hollow supporting body with a polygonal star structure and a rotor main body made of magnetic steel, the hollow structure is used for installing part or all of a speed change mechanism, and the structure is beneficial to realizing the integration of a speed changer and the motor. The invention is essentially a permanent magnet synchronous motor without an inner stator structure, and the main structure of a rotor not only has a permanent magnet but also comprises an iron core bearing a magnetic path.

The invention patent CN 103227521 a discloses a hollow rotor motor and a system comprising the hollow rotor motor, the hollow rotor rotates in the outer stator and is driven by the outer stator, the minimum cross-sectional area of the hollow rotor flow channel is at least 25% of the maximum cross-sectional area of the motor housing, the motor topology comprises surface-mounted permanent magnets, built-in permanent magnets, induction, winding, synchronous reluctance and switched reluctance. The invention discloses a permanent magnet, induction or reluctance motor without an inner stator and a hollow rotor, wherein the main structure of the rotor not only has a permanent magnet or a conductor loop for bearing current, but also comprises an iron core for bearing a magnetic path, and the permanent magnet, induction or reluctance motor is mainly used for a well fluid lifting system capable of bearing extreme pressure and temperature.

The object disclosed in the above patent is that not only the conductor loops or permanent magnets carrying the current are arranged on the hollow rotor, but also the iron core made of a magnetically conductive material is arranged as a magnetic field path, so that the mechanical inertia of the rotor is relatively large, and without an internal stator, the torque density is still not high enough. In some special application occasions, the rotating motor is required to have high torque operation capacity and low mechanical inertia, so that the electromagnetic torque output capacity is improved, and the rotational inertia of the rotor is obviously reduced, so as to meet the characteristic requirement of high dynamic response.

Disclosure of Invention

The invention aims to solve the defects in the prior art, and provides a double-stator cup type rotor motor which solves the problems of large torque requirement and low requirement on mechanical inertia of a rotor.

The technical scheme adopted by the invention is as follows: a double-stator cup type rotor motor comprises an outer stator, an inner stator and a hollow cup type rotor; the outer stator comprises an outer stator iron core and an outer stator winding; the inner stator comprises an inner stator iron core; the outer stator iron core, the inner stator iron core and the hollow cup type rotor are coaxially arranged; the hollow cup type rotor is arranged in a gap between the outer stator and the inner stator.

In the technical scheme, an inner stator winding can be added according to the use condition, and the inner stator winding is arranged in a stator slot of an inner stator iron core; the inner stator winding adopts the same winding structure as the outer stator winding; the inner stator winding is spatially arranged in the same phase as the outer stator winding.

In the technical scheme, uniform outer stator slots are formed in the inner wall of the outer stator core along the circumference; the outer stator winding is two-phase, three-phase or multi-phase winding, and is evenly embedded in the outer stator slot.

In the technical scheme, the outer wall of the inner stator iron core is provided with uniform inner stator slots along the circumference; the inner stator winding is two-phase, three-phase or multi-set multi-phase winding, and is evenly embedded in the inner stator slot.

In the technical scheme, a circle of uniform air gap is formed between the outer stator and the inner stator, the rotating magnetic field of the outer stator and the rotating magnetic field of the inner stator are synchronous and in phase, and are mutually coupled by penetrating the air gap to generate electromagnetic torque.

In the technical scheme, a uniform gap is formed between the outer wall of the hollow cup type rotor and the inner wall of the outer stator core, namely the outer gap; a uniform gap is also formed between the inner wall of the hollow cup type rotor and the outer wall of the inner stator iron core, and the gap is called as an inner gap; the outer gap is typically slightly larger than the inner gap.

In the above technical scheme, the device further comprises a hub; one end of the hollow cup type rotor is fixedly connected with the outer wall of the hub; the inner wall of the hub is fixedly connected with the motor rotating shaft.

Among the above-mentioned technical scheme, still include the pivot, the pivot constitutes synchronous pivoted whole with above-mentioned hollow cup formula rotor, wheel hub, and the pivot adopts the bearing to support.

In the technical scheme, the hollow cup type rotor axially extends out of the end faces of the two sides of the outer stator iron core and the inner stator iron core.

In the technical scheme, the phase winding outgoing lines corresponding to the inner stator winding and the outer stator winding are connected in series or in parallel; when the phase windings are connected in series, the negative lead-out wire of the phase winding of the outer stator winding is connected with the positive lead-out wire of the corresponding phase winding of the inner stator winding; when the phase windings are connected in parallel, the positive outgoing line of the phase winding of the outer stator winding is connected in parallel with the positive outgoing line of the phase winding corresponding to the inner stator winding, and the negative outgoing line of the phase winding of the outer stator winding is connected in parallel with the negative outgoing line of the phase winding corresponding to the inner stator winding.

The invention has the beneficial effects that: by adopting the structure of the inner stator and the outer stator, the magnetic resistance is reduced, the power factor is improved, the line load can be improved, and the electromagnetic torque amplitude is further improved; the hollow cup type rotor does not need an iron core, so that the rotational inertia of the hollow cup type rotor is obviously reduced, and the electromagnetic torque density of unit rotational inertia is improved.

The inner and outer double-stator hollow cup type rotor motor adopting the technical scheme has the advantages that the electromagnetic torque density of unit inertia can reach more than 2000rad/s ^2, is more than 5 times of that of a conventional motor, and has extremely high dynamic response performance.

Drawings

FIG. 1 is a schematic cross-sectional view of an embodiment of the present invention.

FIG. 2 is a schematic axial section view of an embodiment of the invention.

The motor comprises a stator core, an outer stator winding, a hollow cup type rotor, an inner stator winding, an inner stator core, a hub, a bearing and a motor rotating shaft, wherein the outer stator core is 1, the outer stator winding is 2, the hollow cup type rotor is 3, the inner stator winding is 4, the inner stator core is 5, the hub is 6, the bearing is 7, and the motor rotating shaft is 8.

Detailed Description

The invention will be further described in detail with reference to the following drawings and specific examples, which are not intended to limit the invention, but are for clear understanding.

The invention provides a double-stator cup type rotor motor, which comprises an outer stator, an inner stator and a hollow cup type rotor, wherein the outer stator is fixed on the inner stator; the outer stator comprises an outer stator iron core 1 and an outer stator winding 2; the inner stator includes an inner stator core 5; the outer stator iron core 1, the inner stator iron core 5 and the hollow cup type rotor 3 are all of annular structures and are coaxially sleeved; the hollow cup type rotor 3 is arranged between the outer stator iron core 1 and the inner stator iron core 5; the outer stator winding 2 is uniformly arranged in the stator slot on the inner wall of the outer stator core 1. The outer stator winding 2 is a two-phase, three-phase or multi-set multi-phase winding.

The inner stator provides two selectable technical schemes: in the first scheme, the inner stator is only composed of an inner stator iron core 5, the magnetic resistance is reduced, the power factor is improved, and the magnetic field passage function is realized, so that the scheme is suitable for occasions where the inner stator is small in diameter and difficult to arrange windings; and in the second scheme, the inner stator comprises an inner stator iron core 5 and an inner stator winding 4, inner stator slots are uniformly distributed on the outer circle of the inner stator iron core 5 along the circumference, and the inner stator winding is a two-phase, three-phase or multi-set multi-phase winding and is uniformly embedded in the inner stator slots.

The hollow cup rotor 3 provides two alternative solutions: according to the first scheme, conductive metals such as aluminum alloy, copper alloy or titanium alloy are adopted to manufacture a hollow cup rotor, and magnetic lines of force in a cutting air gap generate electromagnetic torque to serve as a hollow cup type rotor induction motor; and in the second scheme, a hollow frame is made of a non-magnetic conducting material, permanent magnets are embedded in the hollow frame, and the permanent magnets generate a magnetic field which changes alternately in an air gap and are coupled with the inner stator and the outer stator through the air gap to serve as a hollow cup type rotor permanent magnet motor.

As shown in fig. 1 and 2, the inner stator of the double-stator cup type rotor motor in this embodiment is provided with an inner stator winding, and the hollow cup type rotor is made of light high-strength aluminum alloy. The motor main body consists of an outer stator iron core 1, an outer stator winding 2, a hollow cup type rotor 3, an inner stator winding 4, an inner stator iron core 5, a hub 6, a bearing 7, a motor rotating shaft 8, a shell and a base. For emphasis, conventionally-seen motor housings and housings are not shown in the drawings.

In the specific embodiment, the outer stator core 1 is formed by axially laminating silicon steel sheets and other soft magnetic materials, the thickness of a single laminated sheet is usually 0.1-0.5 mm, the laminated sheet with a lower power supply frequency can be thicker, the laminated sheet with a higher power supply frequency is suggested to be thinner, and the surface of the laminated sheet is provided with a layer of thin insulating paint to prevent an axial current path from being formed between the laminated sheets. The lamination is pre-tightened by adopting axial pressure, and the lamination coefficient is ensured to be more than or equal to 0.93. The inner circumference of the outer stator core is uniformly provided with grooves in which the outer stator winding 2 can be embedded, pear-shaped grooves and trapezoidal grooves can be adopted during the wire winding scattering, and semi-open grooves or open grooves can be adopted during the winding forming. The number of slots per pole is an integer multiple of the number of winding phases.

The outer stator winding 2 can adopt 2-phase, 3-phase or 6-phase alternating current winding, and the winding form can adopt double-layer lap winding or wave winding. And are uniformly embedded in the outer stator core slots along the inner circle of the outer stator core 1.

The inner stator core 5 is also formed by axially laminating soft magnetic materials with the same thickness as the outer stator core 1, the laminating process is the same as that of the outer stator core 1, and the surface of the laminated sheet is also provided with a layer of thin insulating paint to prevent an axial current path from being formed between the laminated sheets. The inner stator core is coaxial with the outer stator core as shown in fig. 1, and the axial lengths are both equal and aligned as shown in fig. 2. Inner stator slots in which the inner stator winding 4 can be embedded are uniformly arranged on the outer circumference of the inner stator core, the slot type, the slot number and the slot size are the same as those of the outer stator core 1, and the notches of the inner stator core are aligned with the notches of the outer stator core one by one.

The inner stator winding 4 adopts the same winding structure as the outer stator winding 2, is uniformly embedded in the inner stator core slot along the inner circle of the inner stator core 5, and the inner stator winding 4 and the outer stator winding 2 have the same phase in spatial arrangement.

The phase winding outgoing lines corresponding to the inner stator winding 4 and the outer stator winding 2 can be connected in series or in parallel. When the outer stator winding 2 and the inner stator winding 4 are connected in series, the phase winding cathode outgoing line of the outer stator winding is connected with the phase winding anode outgoing line of the inner stator winding; when the phase windings are connected in parallel, the phase winding positive outgoing line of the outer stator winding 2 is connected in parallel with the positive outgoing line of the phase winding corresponding to the inner stator winding 4, and the phase winding negative outgoing line of the outer stator winding 2 is connected in parallel with the negative outgoing line of the phase winding corresponding to the inner stator winding 4.

A circle of uniform air gap, referred to as air gap, is formed between the outer stator core 1 and the inner stator core 5, as shown in fig. 1. The hollow cup type rotor 3 is arranged in the air gap, and the hollow cup type rotor 3 is formed by processing light high-strength aluminum alloy. The hollow cup type rotor 3 is coaxial with the outer stator iron core 1 and the inner stator iron core 5; a uniform gap exists between the outer circle of the hollow cup type rotor 3 and the inner circle of the outer stator core 1, and the gap is called as an outer gap; a uniform gap is also formed between the inner circle of the hollow cup type rotor 3 and the outer circle of the inner stator iron core 1, and the gap is called as an inner gap; to accommodate rotor centrifugal forces and thermal expansion variations, the outer gap is typically slightly larger than the inner gap. The hollow cup type rotor 3 axially extends out of both side end surfaces of the outer stator core 1 and the inner stator core 5 to reduce the influence of the rotor transverse end effect on the electromagnetic performance, as shown in fig. 2.

One end of the hollow cup type rotor 3 is fixedly connected with the outer circle of the hub 6, the inner circle of the hub 6 is fixedly connected with the rotating shaft 8, various forms such as interference fit, bolt pre-tightening and pin key locking can be comprehensively adopted in the fastening connection mode, and the three form a synchronous rotating whole through the fastening connection among each other so as to reliably and stably transmit the rotating torque.

The rotating shaft 8 is supported by a bearing 7, and is supported to be rotatable at high speed with low wear, and is further connected to an external load or a prime mover via a connecting member such as a coupling. When operating as a motor, the electromagnetic power is supplied to an external load and an electromagnetic torque in the same direction as the rotation direction is output.

Those not described in detail in this specification are within the skill of the art.