Double-winding permanent magnet fault-tolerant electric drive system and control method based on three-phase four-leg bridge

Abstract

The invention discloses a three-phase four-leg structure-based double-winding permanent magnet fault-tolerant electric driving system and a control method. A double-winding permanent magnet fault-tolerant motor stator in the system is composed of two sets of evenly-distributed three-phase windings which are independent from each other, wherein the two sets of evenly-distributed three-phase windings spatially differ from each other by an electric angle of 60 degrees; an armature winding concentrated tooth spaced winding mode is adopted to form the two sets of three-phase windings; and according to the driver, two sets of independent three-phase half-bridge driving circuits are adopted, and a direct-current bus-bar and a bridge leg circuit are used in a shared manner. The three-phase four-leg structure-based double-winding permanent magnet fault-tolerant electric driving system of the invention has a motor winding open-circuit fault diagnosis function and a motor winding short-circuit fault diagnosis function, can quickly obtain the type of a fault through diagnosis and locate the fault, and carry out corresponding fault-tolerant control according to a fault diagnosis result and an established post-fault mathematical model and based on acquired signals in the operation of a motor. The three-phase four-leg structure-based double-winding permanent magnet fault-tolerant electric driving system and the control method of the invention have the advantages of simplicity, high feasibility, high reliability and high fault-tolerant capability. With the three-phase four-leg structure-based double-winding permanent magnet fault-tolerant electric driving system and the control method adopted, the problem that a double-winding permanent magnet fault-tolerant motor continues to operate after one-phase and multi-phase open-circuit or short-circuit faults occur can be solved.

Description

technical field [0001] The invention relates to the field of motor control technology, in particular to a dual-winding permanent magnet fault-tolerant electric drive system and control method based on three-phase four-bridge arms. Background technique [0002] With the rapid development of the aerospace field, multi-electric aircraft are gradually replacing the existing hydraulic and pneumatic systems on the aircraft due to their advantages in many aspects such as small size, light weight, high efficiency, and high reliability, and are favored in this field. The more electric aircraft that have come out include Boeing's B787, Airbus' A380, etc. According to the existing research, the design of the electric drive system is very important for the more electric aircraft, and the fault tolerance of the electric drive system and Reliability is directly related to whether the system can continue to operate stably after a failure occurs. [0003] At present, the fault types of ele...

AI Technical Summary

Problems solved by technology

[0004] For the redundant motor drive system, the reliability of the system is improved by repeatedly configuring resources and increasing system redundancy. When a set of controllers or a set of motor windings fails, the main power drive device is cut off, and the remaining A set of main power drive device continues to work, which effectively solves the problem of continuous stable and reliable operation of the electric drive system after an open circuit fault occurs; however, the system often uses a motor with distributed windings, which cannot suppress the short-circuit current when a winding short-circuit fault occurs. The short-circuit current of the faulty phase is coupled to the non-faulty phase through the magnetic field, which will eventually cause malfunction

[0005] The switched reluctance motor drive system is a motor drive system with a special double salient pole structure. The speed control system has a wide speed range, excellent speed control performance, and strong fault tolerance; The magnetic synchronous motor drive system has the disadvantages of large torque ripple, low operating efficiency, and low power density.

[0006] The armature winding of the permanent magnet fault-tolerant motor used in the H-bridge drive system of the multi-phase permanent magnet fault-tolerant motor adopts a single-layer spaced tooth winding method. In addition to the characteristics of small size, high power and small torque ripple of general permanent magnet synchronous motors, It has the advantages of physical isolation, thermal isolation, magnetic isolation, electrical isolation, etc., and can effectively suppress short-circuit current, and the system uses multiple (consistent with the number of phases of multi-phase motor) H-bridge inverters, and one inverter is only connected to multiple Phase permanent magnet fault-tolerant motors are connected to one-phase stator windings. Once an H-bridge inverter or one-phase winding fails, it will be cut off immediately, which will not affect other H-bridge inverters and other phase stator windings; but relative to the redundancy Motor drive system, multi-phase permanent magnet fault-tolerant motor H-bridge drive system needs to double the power switch tube and several times (consistent with the number of phases of the multi-phase motor) power supply system, and the control is complicated

[0007] Double-winding permanent magnet fault-tolerant motor dual three-phase drive system uses two sets of independent three-phase half-bridge inverters to drive permanent magnet fault-tolerant motors with two sets of mutually independent windings. This system has both redundant motor drive system and multi-phase permanent magnet The advantage of the fault-tolerant motor H-bridge drive system is that it has a strong fault-tolerant capability for both open-circuit and short-circuit faults. Compared with the multi-phase permanent magnet fault-tolerant motor H-bridge drive system, the number of power tubes and the number of DC bus power systems are drastically reduced. The control is simple; however, the control idea of ​​the system is to cut off the entire set of windings when an open circuit or short circuit fault occurs, and the non-faulty set of windings operates independently, and the load capacity of the motor is only 50% of that without faults. Disadvantages of insufficient post-system utilization

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