CN-119853561-B - Fault-tolerant control method for modularized bearingless electro-magnetic doubly salient motor under fault

Abstract

The embodiment of the invention discloses a fault-tolerant control method for a modularized bearingless electro-magnetic doubly salient motor under fault, and relates to the field of bearingless electro-magnetic doubly salient motor fault-tolerant control. The three-phase full-bridge converter is used for controlling the switching tube, so that the three-phase full-bridge converter alternately operates in a single-phase bridge type inverter circuit mode under normal operation and fault conditions of the switching tube, fault tolerance of the switching tube in the annular direct-current winding control circuit is realized, and suspension fault tolerance control of the modularized bearingless electro-magnetic doubly-salient motor rotor is realized through multiplexing of the armature winding under the condition of disconnection and loss of magnetism of the annular direct-current winding. The method comprises a three-phase full-bridge converter control strategy for fault tolerance control of the modularized bearingless electro-magnetic doubly salient motor and an armature winding multiplexing control strategy for fault tolerance control of the modularized bearingless electro-magnetic doubly salient motor. The fault-tolerant capability of the modularized bearingless electro-magnetic doubly salient motor is further improved.

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 (3)

1. 1. The fault-tolerant control method for the modularized bearingless electro-magnetic doubly salient motor is characterized by comprising a three-phase full-bridge converter control link and an armature winding multiplexing control link; when the bearingless electro-magnetic doubly salient motor normally operates, the three-phase full-bridge converter for controlling the direct-current annular winding operates as a single-phase bridge inverter circuit, wherein the three-phase full-bridge converter outputs control current to the direct-current annular winding; When the direct current annular winding breaks down to cause the non-bearing electro-magnetic doubly salient motor to lose magnetism, the armature winding simultaneously bears the excitation and suspension functions; In the control link of the three-phase full-bridge converter, the amplitude of the control current output to the direct-current annular winding is the sum of an exciting current component I f and a levitation control current component I sx/sy , wherein I sx 、I sy is an x-axis y-axis levitation control current component respectively; When the three-phase full-bridge converter has a switching tube fault, the three-phase full-bridge converter is replaced by another group of switching tubes and operates as a single-phase bridge inverter circuit; The three-phase full-bridge converter comprises 6 switching tubes T1, T2, T3, T4, T5 and T6, wherein the T1, T3 and T5 are distributed on an upper bridge arm, and the T2, T4 and T6 are distributed on a lower bridge arm; When any switching tube in the T1, the T4 and the T5 fails, the three-phase full-bridge converter is converted into the operation of the T2, the T3 and the T6, so that the control circuit which replaces the T1, the T4 and the T5 and is used as the annular direct current winding operates; The armature winding multiplexing control link comprises the step of introducing a control current with the amplitude being the sum of an exciting current component I f and a levitation control current component I sx/sy into an armature winding.
2. 2. The method of claim 1, wherein a three-phase four-leg converter is used as an armature winding fault-tolerant drive circuit for a modular bearingless electro-magnetic doubly salient motor, the three-phase four-leg converter outputting three-phase current when the modular bearingless electro-magnetic doubly salient motor is operating normally; When the direct current annular winding of the modularized bearingless electro-magnetic doubly salient motor has an open circuit fault, the armature winding of the modularized bearingless electro-magnetic doubly salient motor outputs armature current with an annular direct current winding control current component through the three-phase four-bridge arm converter.
3. 3. The method according to claim 1 or 2, wherein the modular bearingless electro-magnetic doubly salient motor employs two sets of three-phase full-bridge inverters to drive 4 direct-current ring windings, wherein the three-phase full-bridge inverters controlling the direct-current ring windings of the upper and lower modules have six switching tubes S11, S14, S13, S16, S15 and S12, and the three-phase full-bridge inverters controlling the direct-current ring windings of the left and right modules have six switching tubes S21, S24, S23, S26, S25 and S22.

Description

Fault-tolerant control method for modularized bearingless electro-magnetic doubly salient motor under fault Technical Field The invention relates to the field of fault-tolerant control of bearingless electro-magnetic doubly salient motors, in particular to a fault-tolerant control method under the fault of a modularized bearingless electro-magnetic doubly salient motor. Background With the progress of technology, aircraft are gradually developing towards multiple electrification and full electrification, the power level of a power generation starting motor for the operation of an aircraft turbofan engine is gradually increasing, the current motor power level is from 100W to 1MW on the current B787, and the improvement of the power level is witnessed the development of motor technology. However, the progress of the technology also brings further demands to the fault-tolerant capability of the motor, and the fault-tolerant control of the motor is also gradually paid attention to domestic and foreign students. The traditional bearingless electric excitation doubly salient motor rotor has a firm and reliable structure, but a plurality of groups of windings including armature windings, exciting windings and levitation windings are embedded on the stator side, the windings are mutually stacked, obvious coupling effects exist between the windings, any winding fails, and the other healthy windings and the internal magnetic field of the motor can be greatly influenced, so that levitation and electric/power generation operation failure can be caused. Therefore, the modularized bearingless electro-magnetic doubly salient motor is further developed, and has the advantage of stronger reliability compared with the traditional bearingless electro-magnetic doubly salient motor. However, the modularized bearingless electro-magnetic doubly salient motor still lacks an effective fault-tolerant control scheme, so how to realize fault-tolerant control of the modularized bearingless electro-magnetic doubly salient motor under fault becomes a subject to be researched. Disclosure of Invention The embodiment of the invention provides a fault-tolerant control method for a modularized bearingless electro-magnetic doubly-salient motor under fault, which can further improve the fault-tolerant capability 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: A fault-tolerant control method for a modularized bearingless electro-magnetic doubly salient motor under fault comprises a three-phase full-bridge converter control link and an armature winding multiplexing control link, wherein a control object is an annular direct current winding of the modularized bearingless electro-magnetic doubly salient motor, and during normal operation, control current with the size being the sum of an exciting current component I f and a levitation control current component I sx/sy is introduced into the winding to form exciting magnetic potential and levitation magnetic potential. The control link of the three-phase full-bridge converter comprises that when the bearingless electro-magnetic doubly salient motor normally operates, the three-phase full-bridge converter for controlling the direct-current annular winding operates as a single-phase bridge inverter circuit, wherein the three-phase full-bridge converter outputs control current to the direct-current annular winding, specifically, when the bearingless electro-magnetic doubly salient motor normally operates, the three-phase full-bridge converter for controlling the direct-current annular winding operates as a single-phase bridge inverter circuit, and outputs control current to the direct-current annular winding, wherein the amplitude of the control current is the sum of an exciting current component I f and a levitation control current component I sx/sy (I sx、Isy is an x-axis y-axis levitation control current component respectively), and when the three-phase full-bridge converter for controlling the direct-current annular winding fails, the three-phase full-bridge converter changes the other group of switching tube capacity to operate as the single-phase bridge inverter circuit in a wrong way. The armature winding multiplexing control link comprises that when the direct current annular winding breaks down to cause the non-bearing electro-magnetic doubly salient motor to lose magnetism, the armature winding simultaneously bears the excitation and suspension functions. Specifically, when the direct current annular winding breaks down to cause the modular bearingless electro-magnetic doubly salient motor to lose magnetism, the armature winding bears the excitation and levitation functions simultaneously, and the loss of magnetism fault-tolerant control of the modular bearingless electro-magnetic doubly salient motor is realized by introducing control current with the amp