Open-winding induction motor for a cascade power supply system of energy storage and generator

Abstract

The utility model relates to a kind of open-winding induction motor of energy storage and generator (or photovoltaic and generator) cascade power supply system, including rotor, stator, excitation permanent magnet and magnetism adjusting ring, stator includes armature winding, armature winding is open-winding form, magnetism adjusting ring can be adjusted along axial position, when energy storage or photovoltaic independent work, rotor is stationary, magnetism adjusting ring is in short-circuit position, motor no-load air-gap flux density is almost zero, rotor pulsating electromagnetic torque is very small;When energy storage and generator, or photovoltaic and generator work simultaneously, or generator independent work, rotor rotates, magnetism adjusting ring is in open-circuit position, motor no-load air-gap flux density is normal value, generator can provide electric power to outside.This open-winding induction motor shows significant performance advantage in energy storage and generator cascade power supply system, photovoltaic and generator cascade power supply system, not only improves the stability and reliability of system, but also optimizes system performance, reduces energy loss.

Description

Technical Field

[0001] This utility model relates to the field of special motor technology, specifically to an open-winding induction motor for a cascaded power supply system of energy storage and generator (or photovoltaic and generator). Background Technology

[0002] With the rapid development of new energy technologies, cascaded power supply systems combining energy storage and generators, as well as cascaded power supply systems combining photovoltaics and generators, have attracted widespread attention due to their high efficiency and flexibility. In these systems, the motor, as the core component, directly affects the overall system's operating efficiency and stability.

[0003] Traditional cascaded power supply systems for energy storage and generators, as well as cascaded power supply systems for photovoltaics and generators, typically employ open-winding permanent magnet synchronous motors. However, when the energy storage or photovoltaic system operates independently, the motor rotor remains stationary, and the alternating current in the three-phase windings generates a significant pulsating electromagnetic torque in the rotor. This pulsating electromagnetic torque not only increases the mechanical stress on the motor but also causes system vibration and noise, reducing system operating efficiency and reliability.

[0004] To address the aforementioned issues, this invention proposes a novel open-winding induction motor for use in energy storage and generator cascade power supply systems (or photovoltaic and generator cascade power supply systems). Through optimized design, this motor significantly reduces rotor pulsating electromagnetic torque, improving system operating efficiency and stability. Furthermore, the induction motor's rotor structure is relatively simple, offering higher reliability and lower maintenance costs compared to traditional motors. Utility Model Content

[0005] This invention provides an open-winding induction motor for a cascaded power supply system of energy storage and generator (or photovoltaic and generator).

[0006] The specific technical solution of this utility model is as follows: An open-winding induction motor for a cascaded power supply system of energy storage and generator (or photovoltaic and generator) includes a rotor, a stator, an excitation permanent magnet, and a magnetic adjusting ring. The stator includes an armature winding, which is an open winding. The magnetic adjusting ring is axially adjustable. When the energy storage or photovoltaic system operates independently, the rotor is stationary, the magnetic adjusting ring is in a short-circuit position, the motor's no-load air gap magnetic flux density is almost zero, and the rotor's pulsating electromagnetic torque is very small. When the energy storage and generator, or the photovoltaic and generator, operate simultaneously, or the generator operates independently, the rotor rotates, the magnetic adjusting ring is in an open-circuit position, the motor's no-load air gap magnetic flux density is at a normal value, and the generator can provide electrical power.

[0007] Furthermore, preferably, the rotor is an external rotor structure or an internal rotor structure.

[0008] Furthermore, preferably, when the rotor is an external rotor structure, the rotor is a claw-pole external rotor. The claw-pole external rotor is internally provided with a stator, excitation permanent magnets, and an internal adjusting magnetic ring. The stator includes an armature winding, a stator core, a stator yoke, and a stator back yoke. The stator core is disposed close to the inner wall of the claw-pole external rotor. The stator yoke is located inside the stator core. Excitation permanent magnets are evenly distributed on both sides of the stator yoke. The stator back yoke is disposed on the outer end face of the two excitation permanent magnets. The center of the excitation permanent magnets and the stator back yoke is a cavity structure, and the internal adjusting magnetic ring is disposed within this cavity structure.

[0009] Furthermore, preferably, the inner adjusting magnetic ring is composed of an inner adjusting magnetic ring permanent magnet and an inner adjusting magnetic ring magnetic guide block arranged sequentially from the inside to the outside along the axial direction. The axial length of the inner adjusting magnetic ring permanent magnet is the same as the axial length of the excitation permanent magnet. Both the inner adjusting magnetic ring permanent magnet and the excitation permanent magnet are magnetized along the axial direction, and their magnetization directions are opposite.

[0010] Furthermore, preferably, an oil film paper is provided between the internal adjusting magnetic ring and the excitation permanent magnet and the stator back yoke.

[0011] Furthermore, preferably, when the rotor is an inner rotor structure, the rotor is a salient pole rotor. The stator, excitation permanent magnet, housing, and external adjusting magnetic ring are coaxially arranged on the outside of the salient pole rotor. The stator includes an armature winding and a stator core. The stator core is arranged on the outside of the salient pole rotor. The housing is sleeved on the outside of the stator core. The excitation permanent magnet is located between the left and right halves of the housing. The external adjusting magnetic ring is located on the outside of the housing.

[0012] Furthermore, preferably, the external adjustment magnetic ring is composed of two external adjustment magnetic ring conductive blocks and one external adjustment magnetic ring permanent magnet arranged axially. The two external adjustment magnetic ring conductive blocks are respectively located on both sides of the external adjustment magnetic ring permanent magnet. The axial length of the external adjustment magnetic ring permanent magnet is the same as the axial length of the excitation permanent magnet. Both the external adjustment magnetic ring permanent magnet and the excitation permanent magnet are magnetized in the axial direction, and their magnetization directions are opposite.

[0013] Furthermore, preferably, an oil film paper is provided between the external adjusting magnetic ring and the housing.

[0014] Furthermore, preferably, the open-winding induction motor is suitable for cascaded power supply systems of energy storage and generators, and cascaded power supply systems of photovoltaics and generators.

[0015] The beneficial effects of this invention are as follows: The open-winding induction motor of this invention exhibits significant performance advantages in energy storage and generator cascade power supply systems, as well as photovoltaic and generator cascade power supply systems. Through optimized magnetic field regulation and low-pulsation electromagnetic torque design, this motor not only improves the stability and reliability of the system but also optimizes system performance and reduces energy loss. These characteristics make this motor particularly suitable for distributed renewable energy grid connection, with broad application prospects and significant economic benefits.

[0016] (1) Through optimized magnetic field regulation, the rotor pulsating electromagnetic torque is significantly reduced. In the cascaded power supply system, this low pulsating electromagnetic torque characteristic enables the motor to maintain extremely low energy consumption and extremely high stability when energy storage or photovoltaic works independently, and better adapt to different load requirements. Moreover, the flexible magnetic field regulation capability enables the motor to automatically adjust the magnetic field state according to different working modes (energy storage, photovoltaic, generator working independently or in combination), optimize system performance, and improve energy utilization efficiency.

[0017] (2) The rotor structure of the open-winding induction motor is relatively simple. Compared with the traditional open-winding permanent magnet synchronous motor, its rotor does not have complex windings and electronic components, reducing the risk of downtime due to winding failure or electronic component failure. This high-reliability design ensures that the motor can operate stably under various operating conditions in energy storage or photovoltaic and generator cascade power supply systems, reducing maintenance costs and downtime, and improving the overall efficiency and reliability of the system. Attached Figure Description

[0018] Figure 1 A framework diagram of a cascaded power supply system for an open-winding induction motor, consisting of energy storage and generator (or photovoltaic and generator). Figure 2 This is a schematic diagram of the structure of the external rotor open-winding induction motor in Example 1; Figure 3 This is a schematic diagram of the structure of the internal rotor open-winding induction motor in Example 2; Figure 4 Waveform of air gap magnetic flux density of an external rotor open-winding induction motor under no-load conditions; Figure 5 Waveform of air gap magnetic flux density of an internal rotor open-winding induction motor under no-load conditions; In the diagram: 1-Claw pole outer rotor; 2-Inner adjusting magnetic ring, 201-Inner adjusting magnetic ring permanent magnet, 202-Inner adjusting magnetic ring magnetic guide block; 3-Armature winding; 4-Stator core; 5-Stator yoke; 6-Stator back yoke; 7-Excitation permanent magnet; 8-Sagittal pole rotor; 9-Outer adjusting magnetic ring, 901-Outer adjusting magnetic ring magnetic guide block, 902-Outer adjusting magnetic ring permanent magnet; 10-Casing; 11-End cover; 12-Shaft. Detailed Implementation

[0019] To make the technical problems and solutions solved by this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present utility model and are not intended to limit the present utility model.

[0020] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0021] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" 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 of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Example 1

[0022] like Figure 1 Figure 2 As shown, this embodiment provides an open-winding induction motor for a cascaded power supply system of energy storage or photovoltaic generators, including a rotor, a stator, an excitation permanent magnet, and an adjusting magnetic ring. When the rotor is an external rotor structure, it specifically consists of two opposing claw-pole external rotors 1, with the stator, excitation permanent magnet, and inner adjusting magnetic ring 2 coaxially arranged on the inner side of the claw-pole external rotors 1.

[0023] The stator includes an armature winding 3, a stator core 4, a stator yoke 5, and a stator back yoke 6. The stator core 4 is closely attached to the inner wall of the claw pole outer rotor 1. The stator yoke 5 is a solid cylinder located inside the stator core 4. The armature winding 3 is axially arranged in the slots of the stator core 4. The armature winding 3 is an open winding, a three-phase winding, with two terminals for each winding. Excitation permanent magnets 7 are arranged on both sides of the stator yoke 5. The two excitation permanent magnets 7 are magnetized along the axial direction, and the magnetization direction is consistent. The stator back yoke 6 is arranged on the outer end face of the two excitation permanent magnets 7 and is made of magnetically conductive material. The center of the excitation permanent magnets 7 and the stator back yoke 6 is a hollow structure, and the inner adjusting magnetic ring 2 is arranged in the hollow structure.

[0024] Both inner adjusting magnetic rings 2 can move independently along the axial direction for position adjustment. Both inner adjusting magnetic rings 2 are composed of inner adjusting magnetic ring permanent magnets 201 and inner adjusting magnetic ring magnetic guide blocks 202 arranged sequentially from the inside to the outside along the axial direction. The axial length of the inner adjusting magnetic ring permanent magnet 201 is the same as the axial length of the excitation permanent magnet 7. Both the inner adjusting magnetic ring permanent magnet 201 and the excitation permanent magnet 7 are magnetized along the axial direction, and their magnetization directions are opposite.

[0025] Preferably, an oil film paper is provided between the inner adjusting magnetic ring 2, the excitation permanent magnet 7, and the stator back yoke 6, which can reduce the resistance during movement and facilitate the adjustment of the axial position of the inner adjusting magnetic ring.

[0026] When the open-winding induction motor with the above structure is used in a cascaded power supply system for energy storage and generators (or a cascaded power supply system for photovoltaics and generators), the motor's working principle is as follows: When energy storage or photovoltaic power is operating independently, the rotor is stationary and the adjusting magnetic ring is in the short-circuit position. At this time, the inner adjusting magnetic ring permanent magnet 201 and the excitation permanent magnet 7 are completely overlapped. Since they are magnetized along the axial direction in opposite directions, their magnetomotive forces cancel each other out, resulting in almost zero air gap magnetic flux density and very small rotor pulsating electromagnetic torque. Compared to open-winding permanent magnet synchronous motors, this design offers advantages such as low rotor pulsating electromagnetic torque and high reliability. When energy storage and generator, or photovoltaic and generator, are operating simultaneously, or the generator is operating independently, the motor rotor rotates and the adjusting magnetic ring is in the open-circuit position. At this time, the inner adjusting magnetic ring permanent magnet 201 and the excitation permanent magnet 7 are completely misaligned, the motor's air gap magnetic flux density is at its normal value, and the generator can provide electrical power. Example 2

[0027] like Figure 1 Figure 3 As shown, this embodiment provides an open-winding induction motor for a cascaded power supply system of energy storage or photovoltaic generators, including a rotor, a stator, an excitation permanent magnet, and an adjusting magnetic ring. When the rotor is an inner rotor structure, it specifically consists of two salient-pole rotors 8 on the left and right sides of the rotating shaft 12. The stator, the excitation permanent magnet 7, the housing 10, and the outer adjusting magnetic ring 9 are coaxially arranged on the outer side of the salient-pole rotors 8.

[0028] The stator includes an armature winding 3 and a stator core 4. The armature winding 3 is axially arranged in the slots of the stator core 4. The armature winding 3 is an open winding, a three-phase winding, and each winding has two terminals. There are two stator cores 4, which are arranged on the outside of the two salient pole rotors 8. A housing 10 is fitted on the outside of the two stator cores 4, and the excitation permanent magnet 7 is located between the left and right halves of the housing 10.

[0029] The external adjustment magnetic ring 9 is located on the outside of the housing 10. The external adjustment magnetic ring 9 can move independently along the axial direction for position adjustment. The external adjustment magnetic ring 9 is composed of two external adjustment magnetic ring guiding blocks 901 and one external adjustment magnetic ring permanent magnet 902 arranged along the axial direction. The two external adjustment magnetic ring guiding blocks 901 are located on both sides of the external adjustment magnetic ring permanent magnet 902. The axial length of the external adjustment magnetic ring permanent magnet 902 is the same as the axial length of the excitation permanent magnet 7. Both the external adjustment magnetic ring permanent magnet 902 and the excitation permanent magnet 7 are magnetized along the axial direction, and their magnetization directions are opposite.

[0030] Preferably, an oil film paper is provided between the external adjusting magnetic ring 9 and the housing 10, which can reduce the resistance during movement and facilitate the adjustment of the axial position of the external adjusting magnetic ring.

[0031] When the open-winding induction motor with the above structure is used in a cascaded power supply system for energy storage and generators (or a cascaded power supply system for photovoltaics and generators), the motor's working principle is as follows: When energy storage or photovoltaic power is operating independently, the rotor is stationary and the adjusting magnetic ring is in the short-circuit position. At this time, the external adjusting magnetic ring permanent magnet 902 and the excitation permanent magnet 7 are completely overlapped. Since they are magnetized along the axial direction in opposite directions, their magnetomotive forces cancel each other out, resulting in almost zero no-load air gap magnetic flux density and very small rotor pulsating electromagnetic torque. Compared to open-winding permanent magnet synchronous motors, this design offers advantages such as low rotor pulsating electromagnetic torque and high reliability. When energy storage and generator, or photovoltaic and generator, are operating simultaneously, or the generator is operating independently, the motor rotor rotates and the adjusting magnetic ring is in the open-circuit position. At this time, the external adjusting magnetic ring permanent magnet 902 and the excitation permanent magnet 7 are completely misaligned, the motor's no-load air gap magnetic flux density is at its normal value, and the generator can provide electrical power.

[0032] To verify the effectiveness of Examples 1 and 2, a finite element simulation model was established and simulation calculations were performed. The simulation results of the open-winding induction motor no-load air gap magnetic flux density curves of a cascaded power supply system for energy storage and generator (or photovoltaic and generator) are shown below. Figure 4 (Example 1) and Figure 5 As shown in Example 2, when the adjusting ring is in the short-circuit position, the no-load air gap magnetic flux density of the motor is almost zero, indicating that the electromagnetic torque ripple is very small when the motor rotor is stationary. This also demonstrates that the open-winding induction motor of the energy storage or photovoltaic and generator cascade power supply system proposed in this invention has better torque ripple performance than the traditional open-winding permanent magnet synchronous motor.

[0033] The present invention has been described in detail above through specific and preferred embodiments. However, those skilled in the art should understand that the present invention is not limited to the embodiments described above. Any modifications or equivalent substitutions made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An open-winding induction motor for a cascaded power supply system of energy storage and generator, characterized in that: The device includes a rotor, a stator, an excitation permanent magnet, and a magnetic adjustment ring. The stator includes an armature winding, which is an open winding. The magnetic adjustment ring can be adjusted axially. When the energy storage or photovoltaic system operates independently, the rotor is stationary, the magnetic adjustment ring is in a short-circuit position, the motor's no-load air gap magnetic flux density is almost zero, and the rotor's pulsating electromagnetic torque is very small. When the energy storage and generator, or the photovoltaic and generator, operate simultaneously, or the generator operates independently, the rotor rotates, the magnetic adjustment ring is in an open-circuit position, the motor's no-load air gap magnetic flux density is at its normal value, and the generator can provide electrical power.

2. The open-winding induction motor for a cascaded power supply system of energy storage and generator according to claim 1, characterized in that: The rotor can be an external rotor structure or an internal rotor structure.

3. The open-winding induction motor for a cascaded power supply system of energy storage and generator according to claim 2, characterized in that: When the rotor is an external rotor structure, the rotor is a claw pole external rotor (1). The claw pole external rotor (1) is equipped with a stator, an excitation permanent magnet (7) and an internal adjustment magnetic ring (2). The stator includes an armature winding (3), a stator core (4), a stator yoke (5) and a stator back yoke (6). The stator core (4) is set close to the inner wall of the claw pole external rotor (1). The stator yoke (5) is inside the stator core (4). Excitation permanent magnets (7) are evenly arranged on both sides of the stator yoke (5). The stator back yoke (6) is arranged on the outer end face of the two excitation permanent magnets (7). The center of the excitation permanent magnets (7) and the stator back yoke (6) is a cavity structure. The internal adjustment magnetic ring (2) is arranged in the cavity structure.

4. The open-winding induction motor for a cascaded power supply system of energy storage and generator according to claim 3, characterized in that: The inner adjusting magnetic ring (2) is composed of an inner adjusting magnetic ring permanent magnet (201) and an inner adjusting magnetic ring magnetic guide block (202) arranged sequentially from the inside to the outside along the axial direction. The axial length of the inner adjusting magnetic ring permanent magnet (201) is the same as the axial length of the excitation permanent magnet (7). Both the inner adjusting magnetic ring permanent magnet (201) and the excitation permanent magnet (7) are magnetized along the axial direction, and their magnetization directions are opposite.

5. The open-winding induction motor for a cascaded power supply system of energy storage and generator according to claim 4, characterized in that: An oil film paper is provided between the internal adjustment magnetic ring (2), the excitation permanent magnet (7), and the stator back yoke (6).

6. The open-winding induction motor for a cascaded power supply system of energy storage and generator according to claim 2, characterized in that: When the rotor is an inner rotor structure, the rotor is a salient pole rotor (8). The stator, excitation permanent magnet (7), housing (10) and external adjustment magnetic ring (9) are coaxially arranged on the outside of the salient pole rotor (8). The stator includes an armature winding (3) and a stator core (4). The stator core (4) is arranged on the outside of the salient pole rotor (8). The housing (10) is sleeved on the outside of the stator core (4). The excitation permanent magnet (7) is located between the left and right halves of the housing (10). The external adjustment magnetic ring (9) is located on the outside of the housing (10).

7. An open-winding induction motor for a cascaded power supply system of energy storage and generator according to claim 6, characterized in that: The external adjustment magnetic ring (9) is composed of two external adjustment magnetic ring magnetic guide blocks (901) and one external adjustment magnetic ring permanent magnet (902) arranged along the axial direction. The two external adjustment magnetic ring magnetic guide blocks (901) are located on both sides of the external adjustment magnetic ring permanent magnet (902). The axial length of the external adjustment magnetic ring permanent magnet (902) is the same as the axial length of the excitation permanent magnet (7). The external adjustment magnetic ring permanent magnet (902) and the excitation permanent magnet (7) are both magnetized along the axial direction, and the magnetization directions of the two are opposite.

8. The open-winding induction motor for a cascaded power supply system of energy storage and generator according to claim 7, characterized in that: An oil film paper is provided between the external adjustment magnetic ring (9) and the housing (10).

9. An open-winding induction motor for a cascaded power supply system of energy storage and generator according to any one of claims 1-8, characterized in that: The open-winding induction motor is suitable for cascaded power supply systems of energy storage and generators, and cascaded power supply systems of photovoltaics and generators.

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