CN-119853388-B - Modularized bearingless electro-magnetic doubly salient motor

CN119853388BCN 119853388 BCN119853388 BCN 119853388BCN-119853388-B

Abstract

The embodiment of the invention discloses a modularized bearingless electro-magnetic doubly salient motor, relates to the technical field of bearingless electro-magnetic doubly salient motors, and can further improve the fault tolerance of the modularized bearingless electro-magnetic doubly salient motor. The invention comprises a body structure of the modularized bearingless electro-magnetic doubly salient motor and an annular direct current winding control method for controlling the suspension of the modularized bearingless electro-magnetic doubly salient motor. The invention realizes the structural optimization of the traditional bearingless electro-magnetic doubly salient motor, reduces the inter-winding coupling of the traditional bearingless electro-magnetic doubly salient motor, and meanwhile, the modularized topology is beneficial to realizing the physical isolation and the electric, magnetic and thermal isolation of the motor winding, and has high utilization rate of the rest healthy windings in the fault. The topological structure can be used for bearingless electro-magnetic doubly salient motors with other stator and rotor pole numbers.

Inventors

YU LI
Luo zhongshan
CHEN WEI
Zou Haonan
ZHANG ZHUORAN

Assignees

南京航空航天大学

Dates

Publication Date: 20260505
Application Date: 20241122

Claims (5)

1. The modularized bearingless electro-magnetic doubly salient motor is characterized by comprising a rotor core (1), a stator core (2), an armature winding (3) and a ring-shaped direct current winding (4) in a topological structure; the rotor core (1) and the stator core (2) are of salient pole structures; The stator core (2) is uniformly divided into 4 stator modules, wherein the stator modules comprise M1, M2, M3 and M4, and the shapes of the stator modules are the same; the armature winding (3) is wound on a stator pole of the stator core (2), and the annular direct current winding (4) is wound on the middle yoke part of each stator module; The wire ends of the armature windings in one stator module are respectively marked as C Mx-① 、A Mx-① 、B Mx-① 、C Mx-② 、A Mx-② 、B Mx-② in a clockwise direction, the wire ends of the armature windings in the other stator module which are spatially opposite to the one stator module are respectively marked as C My-① 、A My-① 、B My-① 、C My-② 、A My-② 、B My-② in a clockwise direction, x is a positive integer, the maximum value of x is even, and y=x+2; The armature windings of the two opposite stator modules are connected in series to form a three-phase armature winding, wherein A Mx-① of Mx and A My-① of My are connected in series to form an armature winding A MxMy-① ; The adjacent stator modules are not directly connected through iron cores, and magnetic flux generated by the annular direct current winding DC Mz of each stator module only forms a closed loop with the rotor iron core (1) through the stator module, wherein z is a positive integer, and the maximum value of z is equal to the maximum value of x; The toroidal direct current winding (4) includes independent windings DC M1 、DC M2 、DC M3 and DC M4 on each of the yokes of M1, M2, M3 and M4.
2. The modular bearingless electro-magnetic doubly salient motor of claim 1 wherein M1 is opposite M3 and M2 is opposite M4; the armature winding (3) comprises ABC three-phase armature windings A M1M3 、B M1M3 、C M1M3 、A M2M4 、B M2M4 and C M2M4 , wherein A M1M3 、B M1M3 and C M1M3 are respectively wound on M1 and M3, and A M2M4 、B M2M4 and C M2M4 are respectively wound on M2 and M4.
3. A modular bearingless electro-magnetic doubly salient motor as claimed in claim 1 or 2, wherein a levitation control method applied to the modular bearingless electro-magnetic doubly salient motor comprises: by adopting a single-phase bridge inverter circuit, a control current is introduced into the annular direct current winding (4) through the control of a switching tube, wherein the control current is the sum of exciting current I f and levitation control current I sx/sy , and I sx 、I sy is the levitation control current component of levitation control current I sx/sy in the x axis and the y axis respectively.
4. The modular bearingless electro-magnetic doubly salient motor of claim 3 wherein, when the modular bearingless electro-magnetic doubly salient motor is operating normally, the excitation current components of the four stator modules are the same, the excitation field generated by the excitation current of each stator module simultaneously acts as a bias field required for rotor levitation; The levitation control current components of the spatially opposed stator modules are equal in magnitude and opposite in polarity.
5. The modular bearingless electro-magnetic doubly salient motor of claim 4 wherein the currents of the independent windings DC M1 、DC M2 、DC M3 and DC M4 are I DCM1 、I DCM2 、I DCM3 、I DCM4 when the modular bearingless electro-magnetic doubly salient motor is operating normally, wherein, , , , I f denotes an excitation current.

Description

Modularized bearingless electro-magnetic doubly salient motor Technical Field The invention relates to the technical field of bearingless electro-magnetic doubly salient motors, in particular to a modularized bearingless electro-magnetic doubly salient motor. Background With the development of technology, the topology types of motors are more and more, and the control method is more and more complex. As one of the reluctance motors, the bearingless electro-magnetic doubly salient motor has the advantages of no need of lubrication, no friction, high reliability and the like, and is more suitable for high-speed operation. The bearing-free electrically excited doubly salient motor not only has important application in the industrial field which depends on lubrication-free and high-reliability, but also has important development potential for the aviation field, and in the application occasions, strict requirements are put on the fault tolerance of the motor. Therefore, how to further improve the fault tolerance of the modularized bearingless electro-magnetic doubly salient motor becomes a subject to be studied. Disclosure of Invention The embodiment of the invention provides a modularized bearingless electro-magnetic doubly salient motor and a suspension control method, which can further improve the fault tolerance of the modularized bearingless electro-magnetic doubly salient motor. In order to achieve the above purpose, the embodiment of the present invention adopts the following technical scheme: The topological structure of the modularized bearingless electro-magnetic doubly salient motor comprises a rotor iron core (1), a stator iron core (2), an armature winding (3) and annular direct current windings (4), wherein the rotor iron core (1) and the stator iron core (2) are of salient pole structures, the stator iron core (2) is uniformly divided into 4 stator modules which comprise M1, M2, M3 and M4, the shapes of the stator modules are the same, the armature winding (3) is wound on a stator pole of the stator iron core (2), and the annular direct current windings (4) are wound on a middle yoke part of each stator module. The wire ends of the armature windings in one stator module are respectively marked as C Mx-①、AMx-①、BMx-①、CMx-②、AMx-②、BMx-② in a clockwise direction, the wire ends of the armature windings in the other stator module which is opposite to the one stator module in space are respectively marked as C My-①、AMy-①、BMy-①、CMy-②、AMy-②、BMy-② in the clockwise direction, x is a positive integer, the maximum value of x is an even number, y=x+2, the armature windings of the two opposite stator modules are connected in series to form a three-phase armature winding, wherein A Mx-① of Mx and A My-① of My are connected in series to form an armature winding A MxMy-①. For example, a modularized bearingless electro-magnetic doubly salient motor stator core is provided, four modules (respectively marked as M1-M4) are provided, each stator pole is respectively wound with an armature winding (the armature windings in the M1 modules are respectively marked as C M1-①、AM1-①、BM1-①、CM1-②、AM1-②、BM1-② according to the clockwise direction, and the armature windings of the other modules are similar). In a preferred scheme, M1 is opposite to M3, M2 is opposite to M4, and the armature winding (3) comprises armature windings A M1M3、BM1M3、CM1M3、AM2M4、BM2M4 and C M2M4 of ABC three phases, wherein A M1M3、BM1M3 and C M1M3 are respectively wound on M1 and M3, and A M2M4、BM2M4 and C M2M4 are respectively wound on M2 and M4. To balance the back emf, spatially opposed in-phase armature windings are respectively connected in series to form four sets of three-phase armature windings (e.g., a M1-① and a M3-① are connected in series to form a M1M3-① winding). The adjacent stator modules are not directly connected through iron cores, and magnetic flux generated by the annular direct current winding DC Mz of each stator module only forms a closed loop with the rotor iron core (1) through the stator module, wherein z is a positive integer, and the maximum value of z is equal to the maximum value of x. The toroidal direct current winding (4) includes independent windings DC M1、DCM2、DCM3 and DC M4 on each of the yokes of M1, M2, M3 and M4. Adjacent stator modules are not directly connected by the core, and magnetic flux generated by the toroidal direct current winding DC M1 of each module forms a closed loop with the rotor core only through the module (e.g., magnetic flux generated by DC M1 only passes through M1 and the rotor core and not through the remaining stator modules). The suspension control method applied to the modularized bearingless electro-magnetic doubly-salient motor comprises the steps of adopting a single-phase bridge inverter circuit, and controlling a switching tube to introduce control current into an annular direct-current winding (4) so as to realize excitation and suspension control of the modularized bearingless electr