CN104319975A - Single-groove unipolar cylindrical moving-magnet linear alternating-current generator - Google Patents

Abstract

The invention discloses a single-slot unipolar cylinder moving magnet linear alternator, which comprises a coaxial stator assembly and a mover assembly, the stator assembly includes an iron yoke and a coil body, and the coil body is wound in the iron yoke slot; The mover assembly includes an inner iron yoke, four sets of permanent magnets and permanent magnet spacer rings. The four sets of permanent magnets are coaxial with the inner iron yoke and are closely attached to the inner iron yoke. The four sets of permanent magnets are separated by permanent magnet spacer rings. Open, the polarity of the two sets of permanent magnets on both sides is the same, and the polarity of the two sets of permanent magnets in the middle is opposite; the generator air gap is formed between the pole piece of the iron yoke and the four sets of permanent magnets; the mover assembly is in the stator assembly For reciprocating motion. The generator of the invention has small air gap and high air gap magnetic density, and is directly coupled with the reciprocating motor or heat engine. The invention has the advantages of high power density, high efficiency, simple structure, convenient processing and manufacturing, etc., and can be used as thermoelectric conversion equipment for solar energy, nuclear thermal energy, biomass energy Stirling heat engines and other heat engines with linear motion output.

Description

Single Slot Unipolar Cylindrical Moving Magnet Linear Alternator

technical field

The invention relates to the technical field of generators, in particular to a single-slot unipolar cylinder moving magnet linear alternator, which can be used as Stirling solar power generation, biomass Stirling solar power generation, Stirling nuclear power generation and other Electromechanical conversion of a heat engine with linear motion output.

Background technique

Stirling thermal cycle has high efficiency, but its output motion is linear motion. If the linear motion is converted into rotary motion, and then the rotary generator is used for electromechanical conversion, the overall thermoelectric conversion efficiency will inevitably be reduced, and the processing is difficult. Noisy operation. Therefore, a linear generator must be used to take advantage of the Stirling machine to directly transmit the linear motion of the Stirling heat engine to the linear generator mover, and convert mechanical energy into electrical energy output through the linear motion of the linear generator mover in the magnetic field.

Contents of the invention

Aiming at the deficiencies of the prior art, the present invention proposes a single-slot unipolar cylindrical moving-magnet linear alternator, which realizes the combination of a Stirling heat engine with linear motion output and other linear motion output heat engines with the same linear motion generator, The invention overcomes the deficiencies of the prior art and provides a low-noise generator with high efficiency, small size, light weight and convenient processing and manufacturing.

In order to achieve the purpose of the above invention, the present invention provides the following technical solutions: a single-slot unipolar cylinder moving magnet linear alternator, including a coaxial stator assembly and a mover assembly, the stator assembly includes an iron yoke and a coil body, and the coil body Wound in the iron yoke slot; the mover assembly includes the inner iron yoke, four sets of permanent magnets and permanent magnet spacer rings, the four sets of permanent magnets are coaxial with the inner iron yoke, and are closely attached to the inner iron yoke, and the four sets of permanent magnets are coaxial with the inner iron yoke, and the four sets of permanent magnets The magnets are separated by permanent magnet spacer rings. The polarity of the two sets of permanent magnets on both sides is the same, and the polarity of the two sets of permanent magnets in the middle is opposite; the generator air gap is formed between the pole shoes of the iron yoke and the four sets of permanent magnets ; The mover assembly reciprocates in the stator assembly.

Further, the four sets of permanent magnets are all ring structures, and are magnetized in the radial direction.

Further, the axes of the permanent magnet spacer rings between the permanent magnets of different polarities at the two ends of the four groups of permanent magnets are aligned with the axes of the corresponding iron yoke pole pieces.

Further, the four sets of permanent magnets are made of rare earth permanent magnet materials or ferrite permanent magnet materials.

Furthermore, both the iron yoke and the inner iron yoke are made of materials with good magnetic permeability. the

Further, the permanent magnet spacing ring is made of non-magnetic material.

Further, the four sets of permanent magnets have the same axial length and thickness.

Compared with the prior art, the present invention has the following advantages: the permanent magnet magnetic field is used as the electromechanical conversion of the generator, and the generator mover adopts a reciprocating linear motion mode. The structure reduces the volume and weight. Due to the small air gap, the electromechanical conversion efficiency is high, and the symmetrical magnetic pole structure is adopted, which is convenient for installation and control. Compared with the existing permanent magnet linear generator, the single-slot unipolar cylinder moving magnet linear alternator of the present invention has a compact permanent magnet magnetic circuit, high air gap magnetic density, easy installation and control, and high efficiency.

Description of drawings

Fig. 1 is an axial sectional view of a single-slot unipolar cylindrical moving-magnet linear alternator of the present invention;

Fig. 2 is the axial end view of the single-slot unipolar cylinder moving magnet linear alternator of the present invention;

Fig. 3 is a radial sectional view of a single-slot unipolar cylindrical moving-magnet linear alternator of the present invention (a sectional view along the centerline of the permanent magnet spacer ring 7);

Fig. 4 is an axial sectional view (half sectional view along the axis line) of the single-slot unipolar cylindrical moving magnet linear alternator of the present invention.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings. The description in this part is only exemplary and explanatory, and should not have any limiting effect on the protection scope of the present invention.

A single-slot unipolar cylindrical moving-magnet linear alternator as shown in Figures 1 and 2 consists of an iron yoke 1, a coil body 2, an inner iron yoke 3, and four sets of permanent magnets 4, 5, 8, 10. Magnet spacing rings 6, 7, 9 are composed of four sets of permanent magnets 4, 5, 8, 10, which are coaxial with the inner iron yoke 3 and are closely attached to the inner iron yoke 3. The four sets of permanent magnets 4, 5, 8, 10 are separated by permanent magnet spacer rings 6, 7, 9, the polarity of permanent magnet 4 and permanent magnet 10 in four groups of permanent magnets 4, 5, 8, 10 is the same, and the polarity of permanent magnet 5 and permanent magnet 8 Similarly, the polarity of the permanent magnet 4 is opposite to that of the permanent magnet 5 (it can also be magnetized in the opposite direction). The inner iron yoke 3, the permanent magnet spacer rings 6, 7, 9 and four sets of permanent magnets 4, 5, 8, 10 constitute the moving subassembly of the generator. The coil body 2 is wound in the slot of the iron yoke 1, which constitutes the stator assembly of the generator. The wires of the coil body 2 are drawn out from the threading hole of the iron yoke 1. The mover assembly and the stator assembly are coaxial. The four sets of permanent magnets 4, 5, 8, and 10 of the generator moving subassembly form an air gap of the generator, and magnetic fields of different polarities are generated on the air gap. The iron yoke 1 and the moving subassembly form the magnetic circuit of the generator. When the mover assembly reciprocates and linearly moves in the air gap of the generator, the magnetic flux in the magnetic circuit changes, thereby inducing current output in the stator coil body.

As shown in Figures 1, 2, and 3, the magnetization directions of the permanent magnets 4, 5, 8, and 10 (also can be magnetized in the opposite direction), the permanent magnet magnetic circuit of the present invention is: the magnetic flux flows from the N pole of the permanent magnet 4 Starting from the air gap, the pole shoe of the iron yoke 1, the iron yoke 1, the air gap, the S pole of the permanent magnet 8, the N pole of the permanent magnet 8, the inner iron yoke 3, and the S pole of the permanent magnet 4, the generator magnetism is formed. road, as shown by the dotted line in Figure 1. The magnetic flux in the opposite direction starts from the N pole of the permanent magnet 10, passes through the air gap, the pole shoe of the iron yoke 1, the iron yoke 1, the air gap, the S pole of the permanent magnet 5, the N pole of the permanent magnet 5, the inner iron The S pole of the yoke 3 and the permanent magnet 10; such a magnetic circuit structure ensures that the positioning force of the generator mover is zero when it is in a balanced position. When the generator is within its range of motion, due to the change of position, the magnetic flux in the iron yoke undergoes periodic changes related to the position of the mover, thereby inducing a voltage output in the generator coil.

Permanent magnets should be used symmetrically in pairs in a generator, and the magnetization directions are all radial.

As shown in Figure 4, it is the permanent magnet spacing ring 6 between the permanent magnets 4 of different polarities and the permanent magnets 5 at the two ends of the four groups of permanent magnets in the single slot and unipolar cylinder moving magnet linear alternator of the present invention, and The axial centerlines of the permanent magnet spacer rings 9 between the permanent magnets 8 and the permanent magnets 10 are respectively aligned with the axial centerlines of the corresponding pole pieces of the iron yoke 1 .

In the above scheme, the four sets of permanent magnets 4, 5, 8, and 10 of the moving subassembly are separated by permanent magnet spacer rings 6, 7, and 9, and the permanent magnets 4 and the permanent magnets in the four sets of permanent magnets 4, 5, 8, and 10 The polarity of 10 is the same, the polarity of permanent magnet 5 and permanent magnet 8 is the same, and the polarity of permanent magnet 4 and permanent magnet 5 is opposite (also can be magnetized in the opposite direction). The permanent magnet spacing rings 6 between the permanent magnets 4 of different polarities and the permanent magnets 5 at the two ends of the four groups of permanent magnets, and the axial centerlines of the permanent magnet spacing rings 9 between the permanent magnets 8 and the permanent magnets 10 are respectively corresponding to the iron yokes 1 The pole pieces are aligned with the midline.

The permanent magnet of the mover is an axial ring, which is magnetized in the radial direction. The axial length and thickness are the same. It should be made of rare earth permanent magnets or ferrite permanent magnets with good magnetic properties. It should be made of magnetically conductive materials, such as various carbon steels, various alloy steels, electrical pure iron, cast iron, cast steel, etc., and the spacer ring of the permanent magnet of the mover is made of nonmagnetically conductive materials. The coil 2 is formed by winding an electromagnetic wire with good conductivity and then dipping and drying it.

The principle of the above scheme is: the permanent magnet provides the air gap magnetic field for the generator, and the iron yoke 1, the inner iron yoke 3 and the permanent magnet form the magnetic circuit of the generator. The intensity of the medium magnetic field changes periodically, so that a voltage is induced in the generator coil body and output. Due to the small air gap of the generator, the high utilization rate of permanent magnet materials, and no mechanical reversing mechanism, the structure is simple and the electromechanical conversion efficiency is high.

The above is only a preferred embodiment of the present invention, it should be pointed out that, for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications can also be made. It should be regarded as the protection scope of the present invention.

Claims (7)

1. A single-slot unipolar cylinder moving magnet linear alternator, characterized in that: it comprises a coaxial stator assembly and a mover assembly, the stator assembly includes an iron yoke and a coil body, and the coil body is wound on the iron yoke wire slot Inside; the mover assembly includes an inner iron yoke, four sets of permanent magnets and permanent magnet spacer rings, the four sets of permanent magnets are coaxial with the inner iron yoke, and are closely attached to the inner iron yoke, and the four sets of permanent magnets are separated by permanent magnets The polarity of the two sets of permanent magnets on both sides is the same, and the polarity of the two sets of permanent magnets in the middle is opposite; the generator air gap is formed between the pole piece of the iron yoke and the four sets of permanent magnets; the mover assembly is in the stator reciprocating motion in the component. 2. The single-slot unipolar cylindrical moving-magnet linear alternator according to claim 1, characterized in that: the four sets of permanent magnets are all ring structures, and are magnetized along the radial direction. 3. single-slot unipolar cylindrical moving magnet linear alternator as claimed in claim 1, characterized in that: the axis of the permanent magnet spacer ring between the permanent magnets of different polarities at the two ends of the four groups of permanent magnets and its corresponding iron Axis alignment of yoke pole pieces. 4. The single-slot unipolar cylinder moving magnet linear alternator according to claim 1, wherein the four sets of permanent magnets are made of rare earth permanent magnet materials or ferrite permanent magnet materials. 5. The single-slot unipolar cylindrical moving-magnet linear alternator according to claim 1, wherein the iron yoke and the inner iron yoke are both made of materials with good magnetic permeability. 6. The single-slot unipolar cylindrical moving-magnet linear alternator according to claim 1, characterized in that: the spacer ring of the permanent magnet is made of non-magnetic material. 7. The single-slot unipolar cylindrical moving-magnet linear alternator according to claim 2, characterized in that: the axial lengths and thicknesses of the four sets of permanent magnets are the same.