A natural magnetic suspension tidal energy generator device

Abstract

This invention discloses a natural magnetic levitation tidal energy generator device, comprising: a generator unit, the generator unit including a magnetic levitation shell, a stator core, and an impeller; the magnetic levitation shell has a cavity, and openings are provided at both ends of the magnetic levitation shell, the openings communicating with the cavity; the impeller is disposed within the cavity, and a rotor permanent magnet is embedded at the end of the impeller; the stator core is disposed on the inner side of the magnetic levitation shell near the rotor permanent magnet, and windings are provided on the stator core; the stator core and the rotor permanent magnet constitute a radial magnetic circuit permanent magnet generator. This invention uses the force of the tides to drive the impeller to rotate, causing the stator core and the rotor permanent magnet to form a radial magnetic circuit permanent magnet generator; the force of the tides impacts the impeller, causing it to rotate back and forth, generating alternating voltage.

Description

Technical Field

[0001] This disclosure relates to the field of rotary precision machinery technology, and in particular to a natural magnetic levitation tidal energy generator device. Background Technology

[0002] Generating electricity using tidal energy is one of the best ways to utilize natural energy. However, existing tidal generators float on the water surface, occupying water space, resulting in low tidal energy utilization and high costs. Summary of the Invention

[0003] This disclosure provides a natural magnetic levitation tidal energy generator device to solve one of the technical problems recognized by the inventors.

[0004] This disclosure provides a natural magnetic levitation tidal energy generator device, comprising: a generator unit, the generator unit including a magnetic levitation shell, a stator core and an impeller, the magnetic levitation shell having a cavity inside, and openings at both ends of the magnetic levitation shell communicating with the cavity, the impeller being disposed within the cavity, and a rotor permanent magnet being embedded at the end of the impeller, the rotor permanent magnet having a pole number of 2P=40 or 2P=32, the stator core being disposed on the inner side of the magnetic levitation shell near the rotor permanent magnet, the stator core having windings, the stator core having a slot number of Z=36, the stator core and the rotor permanent magnet forming a radial magnetic circuit permanent magnet generator.

[0005] Preferably, the number of slots in the stator core and the number of phases in the winding satisfy Z / (3m) = 4. The winding can be divided into four groups, each group containing three phases V, U, and W. Adjacent V, U, and W three-phase windings are connected in series to form a branch, for a total of four interconnected branches. The two symmetrical branches formed by the two groups of windings that are symmetrically distributed at 180° are connected in parallel to form parallel branch windings. When the number of pole pairs P of the rotor permanent magnet is even, the two parallel branch windings are connected in parallel at the beginning and end (opposite-named ends). When P is odd, the two parallel branch windings are connected in parallel at the beginning and end (same-named ends). One end of the two parallel branch windings is used as the midpoint of the phase winding.

[0006] Preferably, the radial magnetic circuit permanent magnet generator is driven by a variable frequency power supply.

[0007] Preferably, the stator core is divided into several segments, with gaps between each segment, and the segment gap λ of the stator core is... d = (1~2)δ, where δ is the electromagnetic air gap of the motor, the rotor permanent magnet is divided into several segments, and the segment gap λ of the rotor permanent magnet is... r =λ d .

[0008] Preferably, the segment gap between the axial ends of the rotor permanent magnet and the stator core is: λ rd＝ (1.5~2)λ r =(1.5~2)λ d The segment gap between the stator core and the rotor permanent magnet is λ = δ(1~2). When λ is less than 4 to 5 times the axial length of each segment, the axial magnetic levitation stiffness is proportional to the number of segments n. The maximum stiffness of the axial passive magnetic levitation after segmentation is 0.95nK (Nm / mm), where K (Nm / mm) is the stiffness of a single segment of axial passive magnetic levitation. The effective axial working range of the magnetic levitation is 0.95λ.

[0009] Preferably, the radial magnetic circuit permanent magnet generator is a distributed winding motor.

[0010] Preferably, the ratio of the number of slots Z of the stator core to the number of phases m of the winding, Z / m, is an even number. Therefore, each phase winding of this type of motor can form a winding symmetrically distributed along the circumference at 180°, and can generate a 180° symmetrical torque couple.

[0011] Preferably, the impeller has six secondary blades with a height of 0.2 to 0.5 mm evenly distributed at both ends of the cavity and on the outer circumference.

[0012] Preferably, the surfaces of the magnetic levitation housing and the impeller are coated with a polymer anti-corrosion coating.

[0013] Preferably, there are multiple generator units, which are connected in series or in parallel, or multiple generator units are connected in parallel and then in series, or multiple generator units are connected in series and then in parallel, and a management circuit module is connected to the multiple generator units connected in parallel.

[0014] The main beneficial effects of this disclosure are:

[0015] 1. This invention uses the force of tides to drive the impeller to rotate, so that the stator core and the rotor permanent magnet form a radial magnetic circuit permanent magnet generator. The force of tides impacts the impeller, causing it to rotate back and forth and generate alternating voltage.

[0016] 2. Existing tidal generators need to float on the water surface, occupying water surface space, resulting in low tidal energy utilization and high cost; this invention can be directly placed on the seabed in shallow waters, resulting in low cost and high tidal utilization.

[0017] 3. This invention employs radial and axial natural electromagnetic levitation technology, where all the currents in the windings work together to naturally levitate the motor rotor, thus providing a large natural electromagnetic levitation force. To further increase the radial and axial levitation force, this invention adds secondary fins to provide additional radial and axial liquid levitation force, making the invention even more powerful in terms of natural levitation capability.

[0018] It should be understood that both the foregoing general description and the following detailed description are for illustrative purposes and do not necessarily limit the scope of this disclosure. The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate the subject matter of this disclosure. Furthermore, the specification and drawings serve to explain the principles of this disclosure. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the specific embodiments of this disclosure or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the generator unit structure according to an embodiment of the present disclosure;

[0021] Figure 2 This is a schematic diagram of the stator core and winding connection structure according to an embodiment of the present disclosure;

[0022] Figure 3 This is a wiring diagram of a generator group according to an embodiment of the present disclosure;

[0023] Figure 4 This is a schematic diagram showing the connection of the generator unit and the management circuit module according to an embodiment of this disclosure.

[0024] Icons: 1-Magnetic levitation shell; 11-Cavity; 2-Impeller; 3-Rotor permanent magnet; 4-Stator core; 5-Winding. Detailed Implementation

[0025] The technical solutions of this disclosure will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments.

[0026] Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this disclosure.

[0027] In the description of this disclosure, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of this disclosure, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0029] Example

[0030] like Figure 1 As shown, this embodiment provides a natural magnetic levitation tidal energy generator device, including a generator unit. The generator unit includes a magnetic levitation shell 1, a stator core 4, and an impeller 2. A cavity 11 is provided inside the magnetic levitation shell 1. Openings are provided at both ends of the magnetic levitation shell 1, which are connected to the cavity 11, allowing seawater to pass through. The middle part of the cavity 11 corresponding to the opening is called the inner cavity, and the semi-enclosed area outside the cavity 11 located inside the magnetic levitation shell 1 is called the outer cavity. The impeller 2 is provided in the part, and multiple fan blades are provided on the impeller 2. A rotor permanent magnet 3 is embedded in the region of the end of the impeller 2 near the outer cavity. The rotor permanent magnet 3 has a circular structure and the number of poles of the rotor permanent magnet 3 is 2P=40 or 2P=32. The stator core 4 is located on the inner side of the magnetic levitation shell 1 near the rotor permanent magnet 3. Multiple windings 5 ​​are provided on the stator core 4. The stator core 4 and the rotor permanent magnet 3 constitute a radial magnetic circuit permanent magnet generator.

[0031] like Figure 2As shown, the radial magnetic circuit permanent magnet generator is a fractional-slot concentrated winding 5 motor. In this embodiment, the ratio Z / m of the number of slots in the stator core 4 to the number of phases in the winding 5 is even. Therefore, each phase winding 5 can form a winding 5 symmetrically distributed along the circumference at 180°, and can generate a 180° symmetrical torque couple. In this embodiment, the number of slots in the stator core 4 is Z = 36, the number of poles of the rotor permanent magnet 3 is 2P = 40, and the number of phases in the winding 5 is m = 3. The stator core 4 is divided into four segments to obtain a greater passive magnetic levitation capability in the axial direction. The winding 5 does not need to be segmented along with the segmentation of the stator core 4. Each phase winding 5 on the stator core 4 is divided into four groups of windings 5, Kpm = Z / (3m) = 4, symmetrically distributed along the circumference at 180°. Each group has three adjacent windings 5, with the tail ends of the adjacent windings 5 ​​connected in series. The three adjacent windings 5 ​​connected in series form a branch. Similarly, the other three groups of windings 5 ​​of the same phase are connected in series in the same way. Then, the two symmetrical branches formed by the two groups of windings 5 ​​that are symmetrically distributed at 180° are connected to form parallel branch windings 5. The principle of parallel connection is: when the number of pole pairs P is even, the two parallel branch windings 5 ​​are connected according to the first and last ends (opposite name ends). In this invention, when P is odd, the two parallel branch windings 5 ​​are connected in parallel at the beginning, beginning and end, and end (same-name ends), with one end of each parallel branch winding 5 serving as the midpoint of the phase winding 5. When P is even, the two parallel branch windings 5 ​​are connected in parallel at the beginning-end (opposite-name ends). The U-phase winding 5 has two orthogonal parallel branches, one midpoint, and one U-phase winding 5 port. This process is repeated to form 180° symmetrical parallel branches for each of the three phase windings 5. Furthermore, the U, V, and W phase ports and the midpoint of each phase winding 5 are formed. This results in a special 180° symmetrical parallel branch three-phase winding 5. In this invention, each phase winding 5 has one or more pairs of 180° symmetrical parallel branches. The current in these 180° symmetrical parallel branches is theoretically the same when there is no deviation in the air gap between the stator core 4 and the rotor permanent magnet 3. As is well known, there is an attractive force between the stator core 4 and the rotor permanent magnet 3. Due to the bearing, the air gap between the stator and rotor is kept equal, and the attractive force is equal everywhere along the circumference. The bearing makes the radial attractive force in the motor air gap equal everywhere and cancels each other out. However, assuming the motor rotates and the bearing fails, there will inevitably be a deviation in the air gap on both sides of 180°. At this time, the rotor permanent magnet 3 will be attracted to the side with the smaller air gap, and the back electromotive force of the parallel branch on the side with the smaller air gap will inevitably increase, and the current will decrease. Conversely, the back electromotive force of the parallel branch on the side with the larger air gap will decrease, and the current will increase. Thus, the radial tension on the side with the larger air gap increases, and the radial tension on the side with the smaller air gap decreases, which will inevitably cause the air gap to change in the direction of decreasing deviation and stabilize the air gap deviation. Therefore, once the motor starts rotating, this invention has the ability to restore centering via radial natural magnetic levitation.This invention has 36 slots (Z), 40 poles (P), and 3 phases (m). Each phase has two pairs of 180° symmetrical parallel branch windings (5), and the three phases have six pairs of 180° symmetrical parallel branch windings (5). Clearly, it can actively restore rotor alignment from 12 directions. Since the permanent magnet rotor is randomly attracted to the side with the smaller air gap when the motor is not running and not rotating, it is radially unstable due to the lack of back electromotive force and therefore a starting protection bearing. This invention, without adding any sensors or controllers, achieves complete dynamic radial natural electromagnetic levitation and passive axial magnetic levitation functions using traditional motor drive methods.

[0032] Furthermore, in order to enable the rotor permanent magnet 3 to have static electromagnetic levitation capability when it is not rotating, the radial magnetic circuit permanent magnet generator can be driven by a frequency converter. At this time, although the motor is not rotating and there is no back electromotive force e=NBLV, the motor winding 5 has induced electromotive force dΨ / dt, and based on the same principle, the motor has static electromagnetic levitation capability.

[0033] Furthermore, the stator core 4 is divided into four segments, with gaps between each segment, and the segment gap λ of the stator core 4 is... d = (1~2)δ, where δ is the electromagnetic air gap of the motor, the rotor permanent magnet 3 is divided into several segments, and the segment gap λ of the rotor permanent magnet 3 is... r =λ d .

[0034] The rotor core segments at both ends of the rotor axis have a slightly larger gap, λrd = (1.5~2)λr = (1.5~2)λd. To improve the axial passive magnetic levitation stiffness, the stator and rotor are divided into multiple segments. The segment gap is λ = δ(1~2). When λ is less than 4~5 times the axial length of each segment, the axial magnetic levitation stiffness is almost proportional to the number of segments n. The maximum stiffness of the axial passive magnetic levitation after segmentation is approximately 0.95nK (Nm / mm), where K (Nm / mm) is the stiffness of a single segment of axial passive magnetic levitation. However, the effective axial working range of the magnetic levitation is reduced, approximately 0.95λ.

[0035] The radial magnetic circuit permanent magnet generator is a fractional-slot concentrated winding 5-phase motor. The ratio of its slot number to phase number, Z / m, is even. Therefore, each phase winding 5 of this type of motor can form a winding 5 symmetrically distributed along the circumference at 180°, and can generate a 180° symmetrical torque couple. In this invention, the number of slots is Z, the number of pole pairs is P, and the number of phases is m. Each phase has Dz = Z / (2m) pairs of windings 5 ​​symmetrically distributed along the circumference at 180°. The starting ends of each phase's Dz = Z / (2m) pairs of windings 5 ​​are connected in parallel to form the combined port of that phase's windings 5. The tail ends of each phase's Dz = Z / (2m) pairs of windings 5 ​​are connected in parallel to form... The midpoint of the winding 5 is the point of connection for that phase. By analogy, the U, V, and W phase connection ports and the midpoint of the three-phase winding 5 are formed. The rotor permanent magnet 3 can be naturally magnetically levitated from the radial Z / 2 directions. This method is also applicable to radial motors and axial motors. The wiring of this method is relatively complex, but the natural magnetic levitation restoring force is the greatest. Each phase has 6 pairs of 180° symmetrical parallel branch windings 5, and the three phases have 12 pairs of 180° symmetrical parallel branch windings 5. Obviously, the rotor alignment of the motor can be actively restored from 24 directions. It can be called a full radial natural magnetic levitation motor.

[0036] Furthermore, the radial magnetic circuit permanent magnet generator can also be a distributed winding 5 motor. However, it must meet the above-mentioned winding 5 design, in which each phase winding 5 of this type of motor can form a winding 5 symmetrically distributed along the circumference at 180°, and can generate a 180° symmetrical torque couple.

[0037] Furthermore, the impeller 2 has six secondary blades with a height of 0.2–0.5 mm evenly distributed at both ends and on the outer circumference of the cavity 11. The addition of these secondary blades provides additional radial and axial liquid levitation forces, resulting in a more powerful natural levitation capability.

[0038] Furthermore, the surfaces of the magnetic levitation housing 1 and the impeller 2 are coated with a polymer anti-corrosion coating to prevent seawater corrosion.

[0039] like Figure 3 As shown, there are multiple generator units, which can be connected in series or in parallel, or multiple generator units can be connected in parallel and then in series, or multiple generator units can be connected in series and then in parallel. The multiple generator units connected in parallel are connected to a management circuit module.

[0040] Because a group of tidal generator units are distributed nearby, with similar sea conditions, their power generation is very similar. Multiple units can be connected in parallel, in series, or parallel modules can be reconnected in series. Similarly, modules connected in series can be reconnected in parallel. This allows for flexible configuration of a natural electromagnetic levitation tidal generator group control system. To optimize the parallel and series connection of the levitation generator group, parallel and series management modules can be inserted to provide real-time monitoring, enabling the generator group control system to adjust its control strategy promptly and ensure efficient and safe group control operation of the levitation generator device. Each generator unit in this invention has a power output of 5kW, and 1000 units constitute a network generator group, achieving a power generation capacity of 5MW. Tidal generators can operate completely maintenance-free for 10-30 years, truly achieving an ultra-long lifespan.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure, and are not intended to limit them. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this disclosure.

Claims

1. A natural magnetic levitation tidal energy generator device, characterized in that, include: A generator unit includes a magnetic levitation shell, a stator core, and an impeller. The magnetic levitation shell has a cavity with openings at both ends that communicate with the cavity. The impeller is disposed within the cavity, and a rotor permanent magnet is embedded at the end of the impeller. The stator core is located on the inner side of the magnetic levitation shell near the rotor permanent magnet, and windings are mounted on the stator core. The stator core and the rotor permanent magnet constitute a radial magnetic circuit permanent magnet generator. The number of slots in the stator core and the number of phases in the windings satisfy Z / (3m) = 4. Z is the number of slots in the stator core, m is the number of phases in the winding, the winding is divided into four groups, each group of the winding contains three phases V, U, and W, adjacent V, U, and W three-phase windings are connected in series to form a branch, a total of four interconnected branches, the two symmetrical branches formed by the two groups of windings that are 180° symmetrically distributed are connected in parallel to form parallel branch windings, when the number of pole pairs P of the rotor permanent magnet is even, the two parallel branch windings are connected in parallel at the beginning and end, when P is odd, the two parallel branch windings are connected in parallel at the beginning and end, and the end is connected at the beginning and end, and one end of the two parallel branch windings is used as the midpoint of the phase winding.

2. The natural magnetic levitation tidal energy generator device according to claim 1, characterized in that, The radial magnetic circuit permanent magnet generator is driven by a frequency converter.

3. The natural magnetic levitation tidal energy generator device according to claim 2, characterized in that, The stator core is divided into several segments, with gaps between each segment. The segment gap λ of the stator core is... d =(1~2)δ, where δ is the electromagnetic air gap of the radial magnetic circuit permanent magnet generator, the rotor permanent magnet is divided into several segments, and the segment gap λ of the rotor permanent magnet is... r =λ d .

4. The natural magnetic levitation tidal energy generator device according to claim 3, characterized in that, The axial gap between the two ends of the rotor permanent magnet and the segment gap between the stator core is λ. rd =(1.5~2)λ r =(1.5~2)λ d When the segment gap λ of the stator core d The length of each segment of the stator core is less than 4 to 5 times the axial length of the stator core, and the segment gap λ of the rotor permanent magnet is also less than 4 to 5 times the axial length of each segment. r When the axial length of each segment of the rotor permanent magnet is less than 4 to 5 times, the axial magnetic levitation stiffness is proportional to the number of segments, n. The maximum stiffness of the segmented axial passive magnetic levitation is 0.95nK, where K is the stiffness of a single segment of axial passive magnetic levitation. The effective axial working range of the magnetic levitation is 0.95λ. d .

5. A natural magnetic levitation tidal energy generator device according to claim 4, characterized in that, The radial magnetic circuit permanent magnet generator is a distributed winding generator.

6. The natural magnetic levitation tidal energy generator device according to claim 4, characterized in that, The ratio Z / m of the number of slots Z of the stator core to the number of phases m of the winding is an even number. Therefore, each phase winding of the radial magnetic circuit permanent magnet generator can form a winding symmetrically distributed along the circumference at 180°, and can generate a 180° symmetrical torque couple.

7. The natural magnetic levitation tidal energy generator device according to claim 1, characterized in that, The impeller has six secondary blades with a height of 0.2~0.5mm evenly distributed at both ends and on the outer circumference of the cavity.

8. The natural magnetic levitation tidal energy generator device according to claim 1, characterized in that, The surfaces of the magnetic levitation shell and impeller are coated with a polymer anti-corrosion coating.

9. A natural magnetic levitation tidal energy generator device according to claim 1, characterized in that, There are multiple generator units, which can be connected in series or in parallel, or multiple generator units can be connected in parallel and then in series, or multiple generator units can be connected in series and then in parallel.

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