Permanent magnet direct current linear oscillation generator with segmented stator and segmented winding structure

Abstract

The invention discloses a permanent-magnet direct-current linear oscillation generator with a segmented stator and a segmented winding structure. The permanent-magnet direct-current linear oscillation generator comprises a stator and a rotor, the stator adopts a sectional structure and is formed by arranging m sections of stator units with the same structure along the axial direction; each stator unit comprises an inner stator, an outer stator and a coil winding; the outer stator is of a hollow circular ring structure; the inner stator comprises a first hollow circular ring and k stator teeth uniformly distributed outwards in the radial direction of the first hollow circular ring; the coil winding adopts a sectional structure, is wound on the stator teeth respectively, and is connected in series to form a single-phase winding; the rotor comprises a rotor framework and a permanent magnet; the permanent magnets are embedded in the rotor framework and are in one-to-one correspondence with the stator teeth; h groups of permanent magnets are uniformly distributed along the axial direction; and the magnetizing directions of the adjacent permanent magnets are opposite. The linear generator can be used for free piston power generation, oscillation power generation and other high-speed reciprocating linear power generation occasions, and has the advantages of being small in loss, high in power generation efficiency, low in manufacturing difficulty and the like.

Description

Technical Field

[0001] The invention belongs to the field of linear oscillation power generation, in particular to a permanent magnet direct current linear oscillation generator with a segmented stator and segmented winding structure. Background Art

[0002] Linear oscillation power generation is a novel energy conversion technology that directly converts the kinetic energy of linear reciprocating motion into electrical energy through electromagnetic induction, eliminating the intermediate energy conversion step and significantly improving energy conversion efficiency. This technology not only opens up new avenues for sustainable energy utilization but also attracts significant attention for its simple device structure and low cost. Therefore, it has broad application prospects in fields such as ocean power generation and free piston power generation systems, and is a key direction for the future development of energy conversion technology.

[0003] Existing linear oscillation generators still have several problems. On the one hand, linear oscillation generators inevitably generate mechanical friction losses and electromagnetic eddy current losses during operation. These losses will reduce the overall energy conversion efficiency, making it difficult for the generator to meet the demand for high energy conversion efficiency in practical applications. On the other hand, to improve power generation efficiency, many generators use complex electromagnetic structures, such as multi-phase windings and Halbach array magnetization, which greatly increases manufacturing difficulty and production costs. Therefore, how to reduce the losses of linear oscillation generators, improve power generation efficiency, and reduce manufacturing difficulty have become key issues that need to be addressed in current linear oscillation generators. Summary of the Invention

[0004] The purpose of the present invention is to provide a permanent magnet DC linear oscillation generator with a segmented stator and segmented winding structure, so as to achieve the advantages of low loss, high power generation efficiency, and low manufacturing difficulty while meeting the output power requirements.

[0005] The technical solutions for achieving the purpose of the present invention are as follows:

[0006] A permanent magnet DC linear oscillation generator with a segmented stator and segmented winding structure comprises a stator and a mover.

[0007] The stator adopts a segmented structure, consisting of m stator units with the same structure arranged along the axial direction, the center distance between adjacent stator units is the pole pitch τ, and each stator unit includes an inner stator, an outer stator and a coil winding.

[0008] The outer stator is a hollow ring structure.

[0009] The inner stator includes a first hollow circular ring and k stator teeth uniformly distributed radially outward from the first hollow circular ring, and the circumferential interval angle between adjacent stator teeth is 360° / k.

[0010] The coil winding adopts a segmented structure, which is wound on the stator teeth respectively and connected in series to form a single-phase winding; the induced electromotive force and generated current in the above winding remain in the same direction during a stroke.

[0011] The mover includes a mover frame and a permanent magnet; the mover is placed in the air gap between the inner stator and the outer stator and moves axially; the permanent magnet is embedded in the mover frame to form a cylindrical array, and k permanent magnets evenly arranged in the circumferential direction form a group, and the permanent magnets correspond one-to-one with the stator teeth; the h groups of permanent magnets are evenly distributed along the axial direction, h<m; the magnetization directions of adjacent permanent magnets are opposite.

[0012] Preferably, a pole shoe is provided at the outer end of the stator tooth, and the pole shoe extends in the circumferential direction, and the extension range does not exceed the radial projection area of the permanent magnet.

[0013] Preferably, the magnetization direction of the permanent magnet is radial magnetization.

[0014] Preferably, the permanent magnet is an arc-shaped sheet structure and is embedded.

[0015] Preferably, the power generation power P of the permanent magnet DC linear oscillation generator satisfies the following formula:

[0016]

[0017] Where U is the output voltage, I is the output current, U0 is the voltage of the generator 2 / k structure, R is the magnetic resistance, n is the number of winding turns, φ m is the magnetic flux, and v is the velocity of the mover.

[0018] Compared with the prior art, the present invention has the following significant advantages:

[0019] (1) The stator adopts a segmented stator structure, which decomposes the complex overall structure into multiple relatively simple segmented units. Each unit can be processed independently, greatly reducing the manufacturing difficulty.

[0020] (2) The number of stator unit segments is greater than the number of permanent magnet groups, forming a long stator and short mover structure, which can prevent the permanent magnets from being exposed to a fast alternating magnetic field, thereby significantly reducing the eddy current loss in the permanent magnets and improving the power generation efficiency.

[0021] (3) The coil winding adopts a segmented structure. Compared with the traditional continuous winding, the leakage flux is more evenly distributed between the windings, and part of the leakage flux is weakened between the winding segments, thereby reducing the eddy current loss, hysteresis loss and copper loss of the motor and improving the efficiency of the motor.

[0022] (4) The rotor adopts a cylindrical structure. The permanent magnets in the rotor are arc-shaped sheets and embedded in the rotor frame. Therefore, the overall mass of the rotor of this generator is small, and mechanical losses are reduced. The permanent magnets are magnetized radially, and the magnet structure is relatively simple, which is easy to manufacture. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a 1 / 2 structural cross-sectional view of the permanent magnet DC linear oscillation generator of the present invention.

[0024] Figure 2 Schematic diagram of the permanent magnet poles of the permanent magnet DC linear oscillation generator of the present invention.

[0025] Figure 3 This is a 1 / 6 structural magnetic circuit diagram of the permanent magnet DC linear oscillation generator of the present invention when the mover moves to the starting point of the stroke.

[0026] Figure 4 This is a 1 / 6 structural magnetic circuit diagram of the permanent magnet DC linear oscillation generator of the present invention when the mover moves to the midpoint of the stroke.

[0027] Figure 5 This is a 1 / 6 structural magnetic circuit diagram of the permanent magnet DC linear oscillation generator of the present invention when the mover moves to the end of the stroke.

[0028] Figure 6 This is a characteristic diagram of the induced electromotive force and the position of the mover of the permanent magnet DC linear oscillation generator of the present invention.

[0029] In the figure, 1. rotor frame, 2. permanent magnet, 3. coil winding, 4. inner stator, 4-1. stator teeth, 4-2. pole shoes, 5. outer stator. DETAILED DESCRIPTION

[0030] The present invention will be further described below with reference to the accompanying drawings and examples.

[0031] Combine Figure 1 The present invention provides a permanent magnet DC linear oscillation generator with a segmented stator and segmented winding structure, including a stator and a mover.

[0032] The stator adopts a segmented structure, consisting of m stator units with the same structure arranged along the axial direction, the center distance between adjacent stator units is the pole pitch τ, and each stator unit includes an inner stator 4, an outer stator 5 and a coil winding 3.

[0033] The outer stator 5 is a hollow ring structure.

[0034] The inner stator 4 includes a first hollow circular ring and k stator teeth 4 - 1 uniformly distributed radially outward from the first hollow circular ring. The circumferential interval angle between adjacent stator teeth 4 - 1 is 360° / k.

[0035] The coil winding 3 adopts a segmented structure and is wound around the stator teeth 4-1 respectively, and is connected in series to form a single-phase winding; the induced electromotive force and the generated current in the above winding remain in the same direction during a stroke.

[0036] The mover includes a mover frame 1 and permanent magnets 2; the mover is placed in the air gap between the inner stator 4 and the outer stator 5 and moves axially; the permanent magnets 2 are embedded in the mover frame 1 to form a cylindrical array, and k permanent magnets 2 evenly arranged in the circumferential direction form a group, and the permanent magnets 2 correspond one-to-one to the stator teeth 4-1; the h groups of permanent magnets are evenly distributed along the axial direction, h<m; the magnetization directions of adjacent permanent magnets 2 are opposite.

[0037] The outer end of the stator tooth 4 - 1 is provided with a pole shoe 4 - 2 , which extends in the circumferential direction and the extension range does not exceed the radial projection area of the permanent magnet 2 .

[0038] The magnetization direction of the permanent magnet 2 is radial magnetization. The permanent magnet 2 is an arc-shaped sheet structure and is embedded.

[0039] In addition, when the permanent magnet DC linear oscillation generator of the present invention is taken as an example with m segmented stator units and h groups of permanent magnets, its power generation power P can be expressed as:

[0040]

[0041] Where U is the output voltage, I is the output current, U0 is the voltage of the generator 2 / k structure, R is the magnetic resistance, n is the number of winding turns, φ m is the magnetic flux, and v is the velocity of the mover.

[0042] Combine Figure 1 and Figure 2 The stator adopts a segmented structure, consisting of m segments of stator units with the same structure arranged axially; the permanent magnets 2 are embedded in the rotor frame 1 to form a cylindrical array, and k permanent magnets evenly arranged in the circumferential direction form a group, corresponding one-to-one to the stator teeth; the h groups of permanent magnets are evenly distributed along the axial direction, h < m. Through this long stator and short rotor structure, it is ensured that the permanent magnet 2 remains in the magnetic circuit composed of the segmented stator units at any stage of movement. This can prevent the permanent magnet 2 from being exposed to a rapidly alternating magnetic field, thereby significantly reducing the eddy current loss in the permanent magnet 2. On the one hand, it reduces the heat generated by the generator and improves the power generation efficiency. On the other hand, it can prevent the irreversible demagnetization of the permanent magnet 2 caused by eddy current loss.

[0043] Combine Figure 3 , Figure 4 and Figure 5The linear oscillation generator's m segmented stator units and h groups of permanent magnets 2 form several closed magnetic circuits, all oriented perpendicular to the direction of motion of the rotor assembly, forming segmented transverse magnetic circuits. This design improves magnetic flux utilization and generates greater thrust. It also achieves a more uniform magnetic field distribution, reducing losses and improving energy conversion efficiency.

[0044] Combine Figure 6 The linear oscillating generator has a pole pitch greater than the travel range of its rotor; the induced electromotive force and generated current in the winding maintain a constant direction throughout the travel range. This design simplifies the motor's control logic, reduces design complexity and the risk of failure, thereby improving system reliability and stability. Since no commutation is required, the motor avoids mechanical wear and electromagnetic interference caused by commutation, reducing maintenance costs and extending its service life.

[0045] The above description is only an implementation case of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made on the basis of the invention should be included in the scope of protection of the present invention.

Claims

1. A permanent magnet DC linear oscillation generator with a segmented stator and segmented winding structure, comprising a stator and a mover, characterized in that: The stator adopts a segmented structure, consisting of m segments of stator units with the same structure arranged along the axial direction, the center distance between adjacent stator units is the pole pitch τ, and each stator unit includes an inner stator (4), an outer stator (5) and a coil winding (3); The outer stator (5) is a hollow ring structure; The inner stator (4) includes a first hollow circular ring and k stator teeth (4-1) uniformly distributed radially outward along the first hollow circular ring, and the circumferential interval angle between adjacent stator teeth (4-1) is 360° / k; The coil winding (3) adopts a segmented structure and is wound around the stator teeth (4-1) respectively, and is connected in series to form a single-phase winding; the induced electromotive force and the generated current in the winding remain in the same direction during a stroke; The mover comprises a mover frame (1) and permanent magnets (2); the mover is placed in an air gap between an inner stator (4) and an outer stator (5) and moves in an axial direction; the permanent magnets (2) are embedded in the mover frame (1) to form a cylindrical array, wherein k permanent magnets (2) arranged evenly in the circumferential direction form a group, and the permanent magnets (2) correspond one to one with the stator teeth (4-1); the h groups of permanent magnets are evenly distributed in the axial direction, and h < m; the magnetization directions of adjacent permanent magnets (2) are opposite.

2. The permanent magnet DC linear oscillation generator with a segmented stator and segmented winding structure according to claim 1, characterized in that: The outer end of the stator tooth (4-1) is provided with a pole shoe (4-2), which extends in the circumferential direction, and the extension range does not exceed the radial projection area of the permanent magnet (2).

3. The permanent magnet DC linear oscillation generator with a segmented stator and segmented winding structure according to claim 1, characterized in that: The magnetization direction of the permanent magnet (2) is radial magnetization.

4. The permanent magnet DC linear oscillation generator with a segmented stator and segmented winding structure according to claim 1, characterized in that: The permanent magnet (2) is an arc-shaped sheet structure and is embedded.

5. The permanent magnet DC linear oscillation generator with a segmented stator and segmented winding structure according to claim 1, characterized in that: The power generation power P of the permanent magnet DC linear oscillation generator satisfies the following formula: Where U is the output voltage, I is the output current, U0 is the voltage of the generator 2 / k structure, R is the magnetic resistance, n is the number of winding turns, φm is the magnetic flux, and v is the movement speed of the mover.

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