Highly Reliable Modular Hybrid Excitation Doubly Salient Machine for High-Speed Turbine Generation

Abstract

An embodiment of the present invention discloses a highly reliable modular hybrid excitation doubly salient motor for high-speed turbine power generation, which relates to the technical field of doubly salient motors. The motor stator core includes a first module stator core, a second module stator core, permanent magnets, and a magnetic isolation sleeve. The single-phase stator core is composed of two module stator cores, namely the first module stator core and the second module stator core. The three-phase module stator cores are fixed by being embedded in a magnetic isolation sleeve made of magnetic isolation material. An excitation coil and an armature coil are wound on the middle large tooth of the first module stator core, and only an armature coil is wound on the middle large tooth of the second module stator core, without an excitation coil. Both the motor stator core and the motor rotor core are of salient pole structures. The motor realizes the isolation of the magnetic flux paths between phases, ensuring that when a fault occurs in a certain phase winding, the influence of the faulty phase on other phases is relatively small.

Description

Technical Field

[0001] The present invention relates to the technical field of doubly salient motors, and in particular, to a highly reliable modular hybrid excitation doubly salient motor for high-speed turbine power generation. Background Art

[0002] Doubly salient motors are developed on the basis of switched reluctance motors. Currently, relatively mature doubly salient motor structures include permanent magnet doubly salient motors, electric excitation doubly salient motors, hybrid excitation doubly salient motors, etc. Doubly salient motors have received extensive attention due to their simple and reliable structure and good magnetic and thermal characteristics. Among them, the electric excitation doubly salient motor is developed on the basis of the original permanent magnet doubly salient motor. An excitation winding is used on the stator for excitation, and the output voltage can be flexibly adjusted. It has the characteristics of simple and reliable structure, good heat dissipation performance, and suitability for high-speed operation, and has good application prospects in the field of in-wheel starter generators.

[0003] Although the electric excitation doubly salient motor inherits the advantages of the simple and reliable structure of the permanent magnet doubly salient motor and is suitable for high-speed working environments, since the excitation source of the motor is only composed of a voltage source or a current source, its excitation efficiency is low, resulting in a relatively low power density. Due to the unique structure of the traditional doubly salient motor itself, there is a large coupling in the inter-phase magnetic circuit. After a fault occurs in one phase, it will have a greater impact on the non-fault phases, resulting in a relatively low fault tolerance of the motor. The traditional hybrid excitation doubly salient motor uses axial segmented excitation, and the excitation sources are distributed at both axial ends. One section is electric excitation, that is, a voltage source or a current source is used as the excitation source, and the other section uses permanent magnets for excitation. Although this motor has a relatively high power density compared with the electric excitation doubly salient motor, its magnetic field regulation is difficult, and the fault has a greater impact on the non-fault phases, and the fault tolerance of the motor is relatively low.

[0004] Therefore, how to improve the hybrid excitation doubly salient motor so that it has a relatively high power density while the impact of the fault phase on the non-fault phases is relatively small when a fault occurs in one phase, and has a relatively high fault tolerance has become a research topic. Summary of the Invention

[0005] An embodiment of the present invention provides a highly reliable modular hybrid excitation doubly salient motor for high-speed turbine power generation, which can improve the power density of the motor while reducing the impact of the fault phase on the non-fault phases when a fault occurs in one phase, and improve the fault tolerance of the motor.

[0006] To achieve the above object, the embodiments of the present invention adopt the following technical solutions:

[0007] A highly reliable modular hybrid excitation doubly salient motor for high-speed turbine power generation, comprising: a stator core, an armature winding, an excitation winding, a permanent magnet (4), a magnetic isolation sleeve (1), and a rotor core (8), wherein the rotor core (8) serves as the rotor of the motor and the rotor core (8) has a salient pole structure; the stator core includes two types of stator core modules, namely a first module stator core (2) and a second module stator core (3), and both the first module stator core (2) and the second module stator core (3) have a salient pole structure; the first module stator core (2) and the second module stator core (3) are fixed by being embedded in the magnetic isolation sleeve (1), and a permanent magnet (4) is embedded at the position in the middle of the intervals between the large teeth and small teeth of the second module stator core (3); the magnetic isolation sleeve (1) is made of a magnetic isolation material, and the magnetic flux between the first module stator core (2) and the second module stator core (3) is isolated from each other through the magnetic isolation sleeve (1); the first set of armature coils (6) and the second set of armature coils (7) on the first module stator core (2) and the second module stator core (3) are connected in series in sequence to form one phase in the armature winding; three sets of excitation coils (5) distributed on the middle large tooth of the first module stator core (2) are connected in series in sequence to form the excitation winding.

[0008] Wherein, one first module stator core (2) and one second module stator core (3) form a single-phase structure of the stator core; the permanent magnet (4) and the excitation winding provide the required magnetic flux for torque generation, and the three-phase module stator cores share the excitation winding. The permanent magnet (4) is in a strip structure; the permanent magnet (4) is embedded in the second module stator core (3) through an assembly process and is distributed at the position in the middle of the intervals between the large teeth and small teeth of the second module stator core (3). Both the first module stator core (2) and the second module stator core (3) are of E-type structure, and each module has a mechanical angle of 55° along the circumference, a mechanical angle of 15° for the middle large tooth, and mechanical angles of 5° for the small teeth on both sides, and each tooth of the magnetic isolation sleeve (1) occupies a mechanical angle of 5°.

[0009] Further, the first module stator core (2) and the second module stator core (3) are alternately arranged at intervals of 60° mechanical angle along the circumference, and a total of 6 module stator cores are fixed by being embedded in the magnetic isolation sleeve (1).

[0010] Further, the structure of the first module stator core (2) includes three stator teeth. An excitation coil (5) and an armature coil (6) are wound on the middle large tooth among the three stator teeth of the first module stator core (2), and there are no coils on the small teeth at both ends among the three stator teeth of the first module stator core (2); the structure of the second module stator core (3) includes three stator teeth. An armature coil (7) is wound on the middle large tooth among the three stator teeth of the second module stator core (3), and a permanent magnet (4) is distributed at the position in the middle of the large teeth and small teeth of the three stator teeth of the second module stator core (3).

[0011] Further, the stator core altogether includes three first-module stator cores (2) and three second-module stator cores (3); the first-module stator cores (2) and the second-module stator cores (3) are alternately placed at intervals of 60° mechanical angle along the circumference. Among them, the single-phase armature winding is composed of two segments of armature coils respectively distributed on the middle large teeth of the first-module stator core (2) and the middle large teeth of the second-module stator core (3). Specifically, the first set of armature coils (6) on the first-module stator core (2) and the second set of armature coils (7) on the second-module stator core (3) at an interval of 180° mechanical angle are connected in series in turn to form one phase of the armature winding.

[0012] In practical applications, two segments of phase-A armature coils are connected in series in turn to form the phase-A armature winding. The first outgoing terminal A+ and the second outgoing terminal A- of the phase-A armature winding are connected to an external control circuit or a rectifying circuit. The connection modes of the phase-B armature winding and the phase-C armature winding are the same as that of the phase-A armature winding. The first connection terminal of the first set of exciting coils is used as the incoming terminal F+ of the exciting winding, and the second connection terminal of the third set of exciting coils is used as the outgoing terminal F- of the exciting winding. The incoming terminal F+ and the outgoing terminal F- of the exciting winding are connected to an external control circuit.

[0013] The highly reliable modular hybrid-excitation doubly salient motor for high-speed turbine power generation provided by the embodiment of the present invention. The motor stator core includes a first-module stator core, a second-module stator core, permanent magnets and a magnetic isolation sleeve. The single-phase stator core is composed of two module stator cores, namely the first-module stator core and the second-module stator core. The three-phase module stator cores are fixed by being embedded in a magnetic isolation sleeve made of magnetic isolation material. The middle large teeth of the first-module stator core are wound with exciting coils and armature coils, and the middle large teeth of the second-module stator core are only wound with armature coils without exciting coils. Both the motor stator core and the motor rotor core are of salient-pole structures. The motor realizes the isolation of the magnetic flux paths between phases, ensuring that when a fault occurs in a certain phase winding, the influence of the faulty phase on other phases is small, and improving the fault tolerance of the motor. Description of the Drawings

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to these drawings without creative efforts.

[0015] Figure 1 It is a schematic 3D structure diagram of the stator modular hybrid-excitation doubly salient motor provided by the embodiment of the present invention;

[0016] Figure 2This is a 3D structural sectional view of the stator modular hybrid-excitation doubly salient motor provided by the embodiments of the present invention.

[0017] Figure 3 This is a schematic 2D structural sectional view of the stator modular hybrid-excitation doubly salient motor provided by the embodiments of the present invention;

[0018] Figure 4 This is a schematic diagram of the connection of the first set of armature coils and the second set of armature coils of phase A of the stator modular hybrid-excitation doubly salient motor provided by the embodiments of the present invention;

[0019] Figure 5 This is a schematic diagram of the placement positions and magnetic flux directions of two permanent magnets of the highly reliable modular hybrid-excitation doubly salient motor suitable for high-speed turbine power generation provided by the embodiments of the present invention. Detailed implementation manners

[0020] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners. The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary only for explaining the present invention and should not be construed as limiting the present invention. Those skilled in the art of the present technology can understand that unless specifically stated otherwise, the singular forms "a", "an", "the", and "said" used herein may also include the plural forms. It should be further understood that the term "comprising" used in the description of the present invention means the presence of the described features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or their groups. It should be understood that when we say that an element is "connected" or "coupled" to another element, it can be directly connected or coupled to other elements, or there may also be intermediate elements. In addition, the "connection" or "coupling" used here may include wireless connection or coupling. The phrase "and / or" used here includes any unit and all combinations of one or more related listed items. Those skilled in the art of the present technology can understand that unless otherwise defined, all terms (including technical terms and scientific terms) used here have the same meaning as the general understanding of those of ordinary skill in the art to which the present invention belongs. It should also be understood that terms such as those defined in a general dictionary should be understood to have a meaning consistent with the meaning in the context of the prior art and will not be interpreted with an idealized or overly formal meaning unless defined as here.

[0021] An embodiment of the present invention provides a highly reliable modular hybrid-excited doubly salient motor applicable to high-speed turbine power generation. The structure of the highly reliable modular hybrid-excited doubly salient motor applicable to high-speed turbine power generation is as Figures 1 to 3 shown. Among them, in order to better display the winding structure of the motor, Figure 2 it is a 3D structural sectional view of the motor.

[0022] The motor includes a stator core, permanent magnets (4), armature windings, field windings, a magnetic isolation sleeve (1), and a rotor core (8). Among them, the stator core includes a first-module stator core (2) and a second-module stator core (3), and both the first-module stator core (2) and the second-module stator core (3) are salient-pole structures.

[0023] The first-module stator core (2) and the second-module stator core (3) are fixed by being embedded in the magnetic isolation sleeve (1), and only two permanent magnets (4) are embedded in each second-module stator core (3). The magnetic isolation sleeve (1) is made of a magnetic isolation material, and the magnetic fluxes between the first-module stator core (2) and the second-module stator core (3) are isolated from each other.

[0024] A single-phase stator core includes both the first-module stator core (2) and the second-module stator core (3). Among them, the permanent magnets (4) are embedded in the second-module stator core (3) through an assembly process and are distributed in the middle of the large teeth and small teeth of the second-torque-module stator core (3). The single-phase first-module stator core (2) and the second-module stator core (3) are placed at a mechanical angle interval of 180° along the circumference.

[0025] In this embodiment, as Figure 3 、 Figure 4As shown, there are two types of stator cores, the first-module stator core (2) and the second-torque-module stator core (3). The centering of both types of cores is an E-type salient pole structure. The single-phase armature winding of the motor is composed of two sets of armature coils, the first set of armature coils (6) and the second set of armature coils (7), which are respectively distributed on the first-module stator core (2) and the second-module stator core (3), and the two sets of armature coils are connected in series in sequence. Each set of armature coils has two terminals, namely the first terminal and the second terminal. Taking phase A as an example, the second terminal of the first set of phase-A armature coils (6) is used as the outgoing terminal A- of the phase-A armature winding. The first terminal of the first set of phase-A armature coils (6) is connected to the second terminal of the second set of phase-A armature coils (7), and the first terminal of the second set of phase-A armature coils (7) is used as the incoming terminal A+ of the phase-A armature winding. The incoming terminal A+ and the outgoing terminal A- of the phase-A armature winding are connected to an external control circuit or a rectifier circuit. The connection method of the phase-B armature winding and the phase-C armature winding is the same as that of the phase-A armature winding. The incoming terminal and the outgoing terminal of the phase-B armature winding are respectively the first terminal B+ of the first set of phase-B armature coils and the second outgoing terminal B- of the second set of phase-B armature coils; the incoming terminal and the outgoing terminal of the phase-C armature winding are respectively the first terminal C+ of the first set of phase-C armature coils and the second outgoing terminal C- of the second set of phase-C armature coils. The incoming terminal B+ and the outgoing terminal B- of the phase-B armature winding are connected to an external control circuit or a rectifier circuit; the incoming terminal C+ and the outgoing terminal C- of the phase-C armature winding are connected to an external control circuit or a rectifier circuit.

[0026] Two strip-shaped permanent magnets are respectively embedded in the positions between the large teeth and small teeth of the second-module stator core (3). The magnetization directions of the two permanent magnets (4) are symmetric along the axis of the middle large tooth of the second-module stator core (3). The permanent magnets (4) are embedded in the second-module stator core (3). For the specific magnetic flux direction, please refer to Figure 4 .

[0027] The technical problem solved by the embodiment of the present invention is mainly that the coupling between phases of the traditional hybrid-excitation doubly salient motor is relatively strong. When a fault occurs in one phase, it has a greater impact on the non-faulty phases, and the fault tolerance of the motor is relatively low. A modular hybrid-excitation doubly salient motor with low inter-phase coupling, high fault tolerance, and high power density is provided. Compared with the prior art, the solution provided by this embodiment has at least the following advantages:

[0028] The modular hybrid-excitation doubly salient motor realizes a reduction in the inter-phase magnetic flux coupling. While the power density is increased, the impact of the faulty phase on the non-faulty phases is relatively small, and the fault tolerance of the motor is relatively high.

[0029] The modular hybrid-excitation doubly salient motor inherits the advantage of high power density of the traditional hybrid-excitation doubly salient motor, and its fault tolerance is further improved. The structure is simple and reliable, and it is suitable for working environments with high temperature, high speed, and high reliability requirements.

[0030] Each embodiment in this specification is described in a progressive manner. For the same or similar parts among the embodiments, reference can be made to each other, and the key points of each embodiment are the differences from other embodiments. As described above, the above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A highly reliable modular hybrid-excited doubly salient motor for high-speed turbine power generation, characterized in that, Comprising: A stator core, an armature winding, an exciting winding, a permanent magnet (4), a magnetic isolation sleeve (1) and a rotor core (8), wherein the rotor core (8) serves as the rotor of the motor and the rotor core (8) has a salient pole structure; The stator core includes two types of stator core modules, namely a first-module stator core (2) and a second-module stator core (3), and both the first-module stator core (2) and the second-module stator core (3) have a salient pole structure; The first-module stator core (2) and the second-module stator core (3) are fixed by being embedded in the magnetic isolation sleeve (1), and a permanent magnet (4) is embedded at the position in the middle of the intervals between the large teeth and small teeth of the second-module stator core (3); The magnetic isolation sleeve (1) is made of a magnetic isolation material, and the magnetic fluxes between the first-module stator core (2) and the second-module stator core (3) are isolated from each other through the magnetic isolation sleeve (1); The first set of armature coils (6) and the second set of armature coils (7) on the first-module stator core (2) and the second-module stator core (3) are connected in series in sequence to form one phase in the armature winding; Three sets of exciting coils (5) distributed on the middle large teeth of the first-module stator core (2) are connected in series in sequence to form the exciting winding.

2. The highly reliable modular hybrid excitation doubly salient machine for high-speed turbine power generation according to claim 1, characterized in that, One first-module stator core (2) and one second-module stator core (3) form a single-phase structure of the stator core; The permanent magnet (4) and the exciting winding provide the required magnetic flux for torque generation, and the exciting winding is shared by the three-phase module stator cores.

3. The highly reliable modular hybrid-excited doubly salient machine for high-speed turbine power generation according to claim 2, wherein The permanent magnet (4) has a strip structure; The permanent magnet (4) is embedded in the second-module stator core (3) through an assembly process and is distributed at the position in the middle of the intervals between the large teeth and small teeth of the second-module stator core (3).

4. The highly reliable modular hybrid-excited doubly salient machine for high-speed turbine power generation according to claim 2, wherein Both the first-module stator core (2) and the second-module stator core (3) have an E-shaped structure, and each module has a mechanical angle of 55° along the circumference, a mechanical angle of 15° for the middle large teeth, a mechanical angle of 5° for the small teeth on both sides, and each tooth of the magnetic isolation sleeve (1) occupies a mechanical angle of 5°.

5. The highly reliable modular hybrid excitation doubly salient motor for high-speed turbine power generation according to claim 4, wherein The first-module stator core (2) and the second-module stator core (3) are alternately placed at intervals of 60° mechanical angle along the circumference, and a total of 6 module stator cores are fixed by being embedded in the magnetic isolation sleeve (1).

6. The highly reliable modular hybrid excitation doubly salient machine for high-speed turbine power generation according to claim 1 or 2, characterized in that, The structure of the first-module stator core (2) includes three stator teeth. An exciting coil (5) and an armature coil (6) are wound on the middle large tooth among the three stator teeth of the first-module stator core (2), and there are no coils on the small teeth at both ends among the three stator teeth of the first-module stator core (2); The structure of the second-module stator core (3) includes three stator teeth. An armature coil (7) is wound on the middle large tooth of the three stator teeth of the second-module stator core (3), and permanent magnets (4) are distributed at the positions in the middle of the intervals between the large teeth and small teeth of the three stator teeth of the second-module stator core (3).

7. The highly reliable modular hybrid-excited doubly salient machine for high-speed turbine power generation according to claim 1 or 2, characterized in that, The stator core altogether includes 3 first-module stator cores (2) and 3 second-module stator cores (3); The first module stator core (2) and the second module stator core (3) are alternately placed in sequence at intervals of 60° mechanical angle along the circumference. Among them, the first set of armature coils (6) on the first module stator core (2) and the second set of armature coils (7) on the second module stator core (3) at an interval of 180° mechanical angle are connected in series in sequence and constitute one phase in the armature winding.

8. The highly reliable modular hybrid-excited doubly salient machine for high-speed turbine power generation according to claim 7, wherein Two sections of phase A armature coils are connected in series in sequence to form a phase A armature winding. The first outgoing terminal A+ and the second outgoing terminal A- of the phase A armature winding are connected to an external control circuit or a rectifier circuit.

9. The highly reliable modular hybrid-excited doubly salient machine for high-speed turbine power generation according to claim 1, wherein The first connection terminal of the first set of exciting coils is used as the incoming line terminal F+ of the exciting winding, and the second connection terminal of the third set of exciting coils is used as the outgoing line terminal F- of the exciting winding. The incoming line terminal F+ and the outgoing line terminal F- of the exciting winding are connected to an external control circuit.

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