阅读说明：本技术 一种混合励磁绕线转子及混合励磁绕线式同步电机 (Mixed excitation wound rotor and mixed excitation wound synchronous motor ) 是由 赵文良 张利勃 刘炎 刘聪 于 2019-12-12 设计创作，主要内容包括：本发明公开了一种混合励磁绕线转子及混合励磁绕线式同步电机,包括：位于转子中心的转轴,所述转轴外设置转子铁心,所述转子铁心上设置设定数量的凸极,每个凸极两侧上缠绕线圈形成转子励磁绕组,每个凸极的几何中心线的电机转子旋转运动方向的反向一侧表面安装永磁体,整个转子的永磁体呈非对称分布。本发明混合励磁绕线转子可有效利用直流励磁转矩和永磁转矩,并且永磁体非对称设计不仅增加电机的凸极比而增大磁阻转矩,而且使得电机的直流励磁转矩、永磁转矩和磁阻转矩在相同或相近的电流相位角处叠加而提升电磁转矩,进而提升本发明混合励磁绕线式同步电机的转矩密度、效率和功率因数等电磁性能。(The invention discloses a mixed excitation wound rotor and a mixed excitation wound synchronous motor, comprising: the permanent magnet synchronous motor comprises a rotating shaft positioned in the center of a rotor, wherein a rotor iron core is arranged outside the rotating shaft, a set number of salient poles are arranged on the rotor iron core, coils are wound on two sides of each salient pole to form a rotor excitation winding, a permanent magnet is arranged on the surface of one side of the geometric center line of each salient pole, which is opposite to the rotating direction of the motor rotor, and the permanent magnets of the whole rotor are asymmetrically distributed. The mixed excitation wound rotor can effectively utilize direct current excitation torque and permanent magnet torque, and the asymmetric design of the permanent magnet not only increases the salient pole ratio of the motor and increases reluctance torque, but also enables the direct current excitation torque, the permanent magnet torque and the reluctance torque of the motor to be overlapped at the same or similar current phase angles to improve electromagnetic torque, thereby improving the torque density, the efficiency, the power factor and other electromagnetic properties of the mixed excitation wound synchronous motor.)

1. A hybrid excitation wound rotor comprising: the permanent magnet synchronous motor is characterized in that a plurality of salient poles are arranged on the rotor core, coils are wound on each salient pole to form a rotor excitation winding, permanent magnets are arranged on the surfaces of the opposite sides of the geometric center lines of the salient poles in the rotating direction of the motor rotor, and the permanent magnets of the whole rotor are distributed asymmetrically.

2. The hybrid excitation wound rotor as claimed in claim 1, wherein said rotor core is made by laminating silicon steel sheets.

3. A hybrid excitation wound rotor as claimed in claim 1, wherein said permanent magnet is a neodymium iron boron permanent magnet or other permanent magnet.

4. A hybrid excitation wound rotor as claimed in claim 1, wherein said permanent magnets are tile shaped and asymmetrically distributed on the salient poles.

5. The hybrid excitation wound rotor as claimed in claim 1, wherein the permanent magnets are magnetized in a direction radially outward or inward, and the magnetization of the permanent magnets in two adjacent magnetic poles is opposite.

6. A hybrid excitation wound rotor as claimed in claim 1, wherein the magnetomotive force generated by energizing the rotor excitation winding is in the same direction as the direction of magnetization of the permanent magnets mounted on the poles.

7. A hybrid excitation wound synchronous machine comprising: a stator part and a rotor part, characterized in that the rotor part employs a hybrid excitation wound rotor according to any of claims 1-6.

8. A hybrid excitation wound synchronous motor as set forth in claim 7, wherein said stator portion includes: the stator comprises a stator core and a stator winding, wherein the stator core is cylindrical and extends along the direction of a rotating shaft.

9. A hybrid excitation wound-rotor type synchronous motor according to claim 8, wherein a plurality of stator slots are provided at equal intervals in a circumferential direction on an inner periphery of said stator core, said stator slots extending in a convex shape from a side of said stator core toward a direction of a rotation axis; and a three-phase stator winding is arranged in the stator slot.

10. A hybrid excitation wound synchronous machine as recited in claim 8, wherein the stator core and the rotor core are disposed with an annular air gap spacing therebetween.

Technical Field

The invention relates to the technical field of hybrid excitation synchronous motors, in particular to a hybrid excitation wound rotor and a hybrid excitation wound synchronous motor.

Background

The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.

In recent years, permanent magnet synchronous motors have attracted considerable attention with their high torque density and high efficiency. However, since rare earth permanent magnet materials are expensive, it is imperative to develop high performance motors with less or no rare earth permanent magnets. The wound rotor synchronous motor does not depend on permanent magnetic materials, and has low cost, strong stability and relatively low performance. Many researchers have proposed a number of techniques to improve the performance of wound rotor synchronous machines, but the performance still differs greatly from that of permanent magnet synchronous machines. The hybrid excitation wound rotor synchronous motor integrating the advantages of the two motors receives more and more attention because the hybrid excitation wound rotor synchronous motor improves the torque density and the efficiency and has better weak magnetic capacity. The traditional mixed excitation wound-rotor synchronous motor is designed based on a rotor structure of symmetrical permanent magnets and excitation windings, so that the motor cannot fully utilize all torque components.

Disclosure of Invention

In order to solve the problems, the invention provides a hybrid excitation wound rotor and a hybrid excitation wound synchronous motor, which fully utilize direct current excitation torque, permanent magnet torque and reluctance torque and improve the torque density, efficiency and power factor of the motor.

In some embodiments, the following technical scheme is adopted:

a hybrid excitation wound rotor comprising: the permanent magnet synchronous motor comprises a rotating shaft positioned in the center of a rotor, wherein a rotor iron core is arranged outside the rotating shaft, a set number of salient poles are arranged on the rotor iron core, a rotor excitation winding is formed by winding coils on each salient pole, a surface-mounted permanent magnet is arranged on one side of the geometric center line of each salient pole along the reverse direction of the rotating motion direction of the motor rotor, and the permanent magnets of the whole rotor are asymmetrically distributed.

Further, the rotor core is manufactured by laminating silicon steel sheets.

Further, the permanent magnet is a neodymium iron boron permanent magnet or other permanent magnet materials.

Further, the permanent magnet is tile-shaped.

Furthermore, the permanent magnets are magnetized outwards or inwards along the radial direction, and the magnetizing directions of the permanent magnets on two adjacent magnetic poles are opposite.

Further, the magnetomotive force direction generated after the rotor excitation winding is electrified is the same as the magnetizing direction of the permanent magnet arranged on the magnetic pole.

In other embodiments, the following technical solutions are adopted:

a hybrid excitation wound synchronous machine comprising: the stator part and the rotor part adopt the mixed excitation wound rotor.

Further, the stator part includes: the stator comprises a stator core and a stator winding, wherein the stator core is cylindrical and extends along the direction of a rotating shaft.

Furthermore, a set number of stator slots are arranged on the inner periphery of the stator core at equal intervals along the circumferential direction, and the stator slots extend in a convex shape from the stator core side to the rotating shaft direction; and a three-phase stator winding is arranged in the stator slot.

Further, an annular air gap space is formed between the stator core and the rotor core.

Compared with the prior art, the invention has the beneficial effects that:

the mixed excitation winding rotor can simultaneously output direct-current excitation torque, permanent magnet torque and reluctance torque, and remarkably improves the electromagnetic properties of the motor such as torque, efficiency, power factor and the like.

The permanent magnet on the convex pole side of the hybrid excitation rotor is designed and installed to have asymmetry, and the asymmetric structure can optimize the torque component superposition relationship of the traditional wound rotor synchronous motor and the permanent magnet synchronous motor, so that the direct current excitation torque, the permanent magnet torque and the reluctance torque of the hybrid excitation wound synchronous motor are superposed at the same or similar current phase angles, the utilization rate of the torque components of the motor is improved, the torque output of the motor is improved on the premise of not changing the size of the motor, and the integrity of the motor, such as torque density, efficiency, power factor and the like, is further improved.

The hybrid excitation rotor of the invention adopts the permanent magnet and the direct current winding coil as the excitation sources respectively, the performance of the motor can be comprehensively improved by the matching use of the two excitation sources, and the direct current excitation torque and the permanent magnet torque generated by the two excitation sources are collectively called as the excitation torque. The asymmetric installation of the permanent magnets improves the utilization rate of each torque component and improves the integral torque output; the rotor flux linkage has the characteristic of easy control by using the winding coil, the weak magnetic speed raising of the motor can be realized more conveniently, and meanwhile, the torque output of the motor can be increased under the condition that the current on the stator side is not changed by controlling the current of the rotor winding, so that the performance of the motor is more stable.

Drawings

Fig. 1 is a cross-sectional structural view of a 27-slot 4-high electromagnetic performance hybrid excitation wound rotor synchronous motor perpendicular to a rotating shaft in the first embodiment of the invention;

FIG. 2 is a cross-sectional view of a rotor with the magnetizing direction of the permanent magnets and the current applied to the windings labeled according to a first embodiment of the present invention;

FIG. 3 is a cross-sectional view of one magnetic pole of a hybrid excitation wound rotor according to a first embodiment of the present invention;

FIG. 4 is a torque curve of an exemplary motor of the present invention;

fig. 5 is a torque characteristic diagram of a conventional wound-rotor synchronous motor, a hybrid excitation synchronous motor or a salient-pole permanent magnet synchronous motor for comparison;

the magnetic torque motor comprises a stator core 1, a stator winding 2, an air gap 3, a rotor fixing screw 4, a rotor excitation winding 5, a rotor core 6, a permanent magnet 7, a rotating shaft 8, a direct-current excitation torque and permanent magnet torque (or excitation torque), a reluctance torque 10 and an electromagnetic torque 11.

Detailed Description

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The embodiments and features of the embodiments of the present invention may be combined with each other without conflict.