In high-voltage dc power systems of advanced aircraft, most the electrical motor drives and electronic converters behave as constant loads (CPLs) when tightly regulated usually cause negative impedance instability problems. This paper presents stability criteria for an system constituted a supply, multistage <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex Notation="TeX">$LC$</tex></formula> filters, ideal CPL. The...

The aircraft electric actuator is one of the most important kind loads future more aircraft. power characteristic an possesses feature rapidly varying in a wide range, and it shows constant load nature small-signal sense. In this paper, novel dc-bus voltage switched control method three-phase source pulsewidth-modulated rectifiers (VSRs), which aims to solve problem flexible regulating under dynamic loads, proposed cascade structure rotating synchronous coordinates d−q . Several linear...

The development of electric vehicles has brought about a campaign for researching and developing new motors. In this paper, novel wheel hub motor is proposed, according to the regulation that electromagnet permanent magnet interact in way homopolar magnets repel heteropolar attract. can be assembled by identical electromagnetic units with U-shaped electromagnets stator rotor, making it convenient flexible practical requirement. voltage equation formula torque are given analyzing...

Most of power electronic converter loads and motor loads, in advanced aircraft systems, behave as constant loads. To attenuate the switching noise these EMI filters are needed at input terminals. The purpose this paper is to introduce a novel design method double LC for high more electric systems. This can guarantee overall systems stability during large disturbances, simultaneously, it also meet standards attenuation. based on mixed potential theory, existence equilibrium points three...

Quantum genetic algorithm (QGA) was proved better than the traditional in numerical and combinatorial optimization problems. However, it seldom applied to optimize In-Wheel motors. For exerting advantages of QGA adequately, a new motor which is similar transverse-flux permanent magnet (TFPMM) optimized based QGA. Firstly, structure working principle this are introduced. Secondly, torque ripple rate model established could be found that size air gap have great relationship with its ripple....

In this paper, a novel hybrid Three-Redundant Electro-Mechanical Actuator (EMA) system is proposed, which mainly composed of two automatic brushless DC motor (BLDCM) drivers and one manual BLDCM driver. Each driver in charge the control motor. At any tine, only set works to realize accurate position control. The rationality analysed then. Compared with traditional redundant EMA parallel structure, exhibits advantages more simple flexibility higher reliability. Two kinds fault tolerant...

In this paper a hybrid quad-redundant Electro-Mechanical Actuator (EMA) used in the aircraft is researched, which composed of two brushless DC motors with sets control channels, driven by four independent power electronic units, output torque coupled through mechanical transmission device. The configuration introduced into electrical unit weakness reliability system, and it exists "Fail-Op, Fail-Op" fault tolerant operation capability. principle EMA analyzed, modes methods are discussed...

The secondary energy of more electric aircraft uses electrical to replace hydraulic and pneumatic in order achieve the purpose saving energy. flight control system is an airborne complete transformation. According actuator short-time power characteristics system, this paper compares with traditional terms loss, transmission It also analyses optimization system. On basis, are simulated under typical status analyzed by simulation data.

As power electronic converters become more widely used in aviation systems, the associated capacitive loads harmonic filter circuits increase accordingly. The risk of self-excitation aeronautical synchronous generators due to is thus increased. Compared with a generator conventional fixed-frequency system, this process complicated variable-frequency supply (360–800 Hz), as both varied frequency and loading conditions contribute self-excitation. To quantify effect, our study, series-parallel...

This paper studyed a new hybrid rectifier applied to the Air Supply. By analyzing operation principle of circuit topology and input current characteristics,we proposed control target designed strategy based on PR controller/quasi controller achieve it. It can make two paralleling outputs including PWM Diode parts supply active power at same time. The be allocated by changing given in system. recitfier part compensate harmonic component so well which is produced that content least. Compared...

A new circuit of power converter for aircraft variable frequency AC electrical system is discussed. The three-phase diode rectifier rearranged by using three single-phase rectifiers. factor each corrected a passive correction technique based on resistive-capacitive branch connected at the DC-side rectifier. Analyses performances are developed with help MATLAB/Simulink. Some considerations different working conditions also developed.

This paper presents a novel analysis method for the three-phase voltage source PWM rectifier (VSR). And new is employed to analyze VSR with variable frequency supply. The simulation results are presented. they show that proposed simple and effective.

A novel building-block transverse flux permanent-magnetic motor (B-TFPM) structure was analyzed. The stator electromagnets is decoupled. Like “building-blocks”, the whole consisted of series elementary blocks. two features overcome majority TFPMs' shortcomings complex structures and difficult manufacture. multi-phase stators are placed in same circle, which reduces axial size. Therefore it more suitable for wheel hub driving. mechanical characteristic deduced based on its voltage torque...

Redundant structures are often used for improving the reliability of electrical systems in aircrafts. In paper, an electro-mechanical actuator (EMA) with hybrid redundant structure is researched more-electric aircraft (MEA). This kind EMA combines electric redundancy and mechanical redundancy. It has two dual-winding brushless DC motors (BLDCM) driven by four sets power circuits. The circuits controlled control units based on DSP, output torque these integrated gear reducer. According to...

Aircraft variable frequency power and a new application of induction motor under the aero-power are introduced. The transient models simulation reviewed. A model method is presented that includes deep-bar effect magnetic saturation. Dynamic magnetizing inductance, rotor resistance leakage reactance considered as varying parameters in state-space model. Base on known structure speed, these can be calculated.

"More electric/all electrical aircraft" become the development trend in modern aviation, which leads a large increase of motor devices. This makes power supply system inductive. A capacitor filter is used to improve load characteristics and correct factor. Coupled with using 360~800Hz system, will complex. paper consider general situation, equivalent model asynchronous established, simplified, simplified RL impedance derived analyze motor. Combined example, impact for changing frequency...

The estimation of devices states and the prediction condition developments are always utilized in projects by monitoring time-series data. For solving problems non-stationary time-varying variance practical data, generalized autoregressive conditional heteroscedasticity (GARCH) model is discussed, compared with traditional model, this paper order to gain a better greater predicting effect. In GRACH applied state constant speed generator drive (CSD) aircraft for residual life prediction....

Aero variable-frequency generators are employed in current airplanes to provide high power for increasing loads. Due nonlinear characteristics of electrical material, an induction machine works at saturated state when aero frequency is lower than its rated frequency. As a result, machines generate harmonic the line aircraft system. To satisfy requirements quality, should be restrained. The flux density and saturation factors adopted study analyze relevant harmonic. Current components...

More electric/all electrical aircraft" become the development trend in modern aviation, which leads a large increase of nonlinear devices.A capacitive load is formed when uses capacitor filter to improve quality DC power supply.Coupled with using 360~800Hz supply system, impedance characteristics system will complex.This paper consider general situation, deduces parameter calculation expressions equivalent exchange RC series-parallel load.Then, combined example, impact for changing frequency...

To effectively solve the fault diagnosis problem of BLDCM unbalanced three-phase winding under unsteady case, this article puts forward a method based on Support Vector Machine (SVM) and FFT. Using FFT to analyze time-frequency local signal can extract features, which are utilized for SVM training. Once satisfied effects achieved, structure internal parameters should be freezed. compare output codes with given input realize goal diagnosis. At same time, simulate by building position servo...