This paper investigates the inverter nonlinearities in a drive system based on silicon carbide metal-oxide-semiconductor field-effect transistor (SiC-mosfets) and compares its performance with that of an equivalent insulated-gate bipolar (Si-IGBT) system. Initially, novel comprehensive analytical model voltage distortion is developed. Not only drops, dead time, output capacitance, but also switching delay times overshoot power devices are taken into account model. Such yields more accurate...

This paper proposes a novel ten-phase fault-tolerant permanent-magnet synchronous motor (FTPMSM) with two stators and rotors on the same shaft. Furthermore, concentrated, single-layer, alternate-teeth-wound winding is adopted to enhance fault isolation capacity of motor. In addition, we propose new approach speed control developed motor, which takes electromagnetic torque ripple in switch process into account. The can guarantee uniform boundedness ultimate system regardless load disturbance...

Rotational power losses have been measured on nonoriented grain-oriented silicon steel sheets under different rotational flux conditions. Several methods proposed for this purpose. Among these, a method based the measurement of field quantities B/sub x/, y/, H/sub and y/ seems to be most convenient as far preparation test specimen is concerned. In method, loss P/sub r/ torque generated from angle lag between H-vector B-vector caused by rotating field. The effect axis ratio components...

In this article, a new power switch open-circuit fault diagnosis approach is proposed for the six-phase fault-tolerant permanent magnet synchronous motor (FTPMSM) system based on average current Park's vector (ACPV), which can detect FTPMSM in both normal and phase open-circuit/short-circuit operation conditions. To fault, detection moduli of ACPV two orthogonal subspaces first even short-circuit operation. Then, ACPV-based location proposed, identify according to sign symbol ACPV. The...

The control design problem for a class of constrained uncertain systems is considered in this paper. uncertainty the system, including unknown system parameters and external disturbance, nonlinear time-varying. bound described via fuzzy set. states are to be bounded. A one-to-one state transformation proposed convert bounded into unconstrained system. new robust scheme then transformed which deterministic form not if-then rule based. By description bound, optimal gain proposed, minimizes...

To enhance the reliability of fault-tolerant permanent-magnet synchronous motor (FTPMSM) drives, a new sensorless control based on robust observer, nonorthogonal phase-locked loop (PLL), and variable phase delay compensation is proposed, which can guarantee medium- high-speed performance for FTPMSM even in open-circuit short-circuit fault conditions. A observer proposed to achieve any two healthy back electromotive force (EMF) estimation, regardless parameter variation, external disturbance,...

This article proposes a novel dual-three-phase high-power high-speed permanent magnet assisted synchronous reluctance starter generator (PMaSynR SG) for aviation application, which has the characteristics of high efficiency, power density, reliability, and excellent antishort-circuit ability. The proposed PMaSynR SG can obtain higher efficiency density by embedding in rotor topology compared with generator, better ability starter-generator. Moreover, design winding is adopted, not only...

To improve the current tracking performance, this article proposes a new fault-tolerant control for six-phase permanent magnet synchronous motor (FTPMSM) system with multifrequency quasi-proportional-resonant (QPR) and back electromotive force (EMF) feedforward compensation, which can track time-varying sinusoidal nonsinusoidal reference currents in stationary frame (SRF) under normal fault conditions. First, QPR controller shunt topology is proposed to SRF, guarantee performance regardless...

This article proposes a new pulsewidth modulation (PWM) harmonic-current-based diagnostic method for the interturn short-circuit fault (ITSCF) of fault-tolerant permanent-magnet synchronous motor (FTPMSM) drives, which is able to detect and locate phase system even in operation (FTO) condition. The ITSCF model H-bridge drive-based FTPMSM first proposed, while high-frequency harmonic current component impedance are analyzed both normal conditions. PWM approach then proposed confirm phase,...

In this paper, a four-phase interleaved parallel bidirectional DC/DC converter topology is proposed. A model predictive control-based current equalization method and voltage stabilization control are introduced to meet the high power lightweight demands for converters solve problem of unequal distribution between phases. current-voltage dual-loop scheme constructed phase-to-phase equalisation stabilise output under load input variations. The effect phase-shifted prediction on inductor...

The dual three-phase permanent magnet synchronous generator (DTP-PMSG) has a promising application in aircraft starter-generator system. However, the electromagnetic coupling existing between three phases causes current harmonics, which poses difficult problem for highly dynamic voltage stabilisation control of DTP-PMSG. In this paper, maximum four-vector space vector pulse width modulation (SVPWM) algorithm is proposed based on decoupling (VSD) to achieve harmonic suppression DTP-PMSG...

Improving fault tolerant performance of permanent magnet synchronous motor has always been the central issue electrically supplied actuator for aerospace application. In this paper, a novel is proposed, which characterized by two stators and rotors on same shaft with circumferential displacement mechanical angle 4.5°. It helps to reduce cogging torque. Each segment stator rotor can be considered as an 8-pole/10-slot five-phase concentrated, single-layer alternate teeth wound winding, enhance...

This article proposes a robust observer and nonorthogonal phase-locked loop (PLL)-based sensorless control for the fault-tolerant permanent magnet synchronous motor (FTPMSM) in medium- high-speed ranges to improve position estimation reliability of system, which can be applied FTPMSM system both normal fault conditions. Due unsymmetric state under condition, new scheme based on back electromotive force (EMF) nonfault two-phase windings is proposed, reference frame transformation not...

To improve the power density and simplify seal structure, Wet-Type Permanent Magnet Synchronous Motor (WTPMSM) technique has been applied to aerospace Electro-Hydrostatic Actuators (EHA). In a WTPMSM, stator rotor are both immersed in aviation hydraulic oil. Although heat dissipation performance of WTPMSM can be enhanced, oil will cost an extra frictional loss narrow airgap WTPMSM. This paper proposes accurate model for which wide speed range (0-20 kr/min) narrowness (0.5-1.5 mm) its...

To enhance the fault transient performance of aerospace multiphase permanent magnet synchronous motor (PMSM) system, an adaptive robust speed control is proposed regardless phase open-circuit (OC) and short-circuit (SC) in this paper, which can be applied for both redundant system tolerant system. For PMSM besides external load disturbance parameter perturbation, there inevitably exists electromagnetic torque ripple process, degrade even cause instability. cope with issue, electromagnet...

The authors propose an adaptive robust control approach for the levitation of non-linear maglev vehicle with state constraint. system contains and (possibly) time-varying uncertainty, which is supposed to be bounded. In order prevent undesirable collision, airgap between suspended chassis guideway should restrained in a specified range safety concerns. Furthermore, does not satisfy (global) matching condition. three-step transformation transform interconnected uncertain system. After that,...

The position control and vibration suppression problems of the flexible solar array drive system containing uncertainty are considered in this paper. may be due to unknown parameters external disturbance. bound can described via a fuzzy set. In addition, there exists system. A new optimal robust approach with input shaping is proposed for By designing command trajectory, shaper suppress vibration. To enhance performance, by description bound. Neither nor <sc...

Improving frequency response of direct drive valve (DDV) system is a research focus on the hydraulic system. This paper presents high-frequency DDV based voice coil motor (VCM-DDV). First, new design VCM with high acceleration proposed. A magnetic circuit method and electromagnetic finite element are adopted in this paper. 3-D thermal field also employed to analyze temperature rise developed at rated current. Next, dual closed-loop control structure applied VCM-DDV Moreover, nonlinear PID...

With the development of more/all electrical aircraft technology, an electro-mechanical actuator (EMA) is more and used in actuation system. The motor system, as crucial part EMA, usually adopts redundancy technology or fault tolerance to improve reliability. To compare performances these two systems, a 10-pole/12-slot six-phase permanent magnet synchronous (PMSM) designed with concentrated single-layer winding, which able operate at dual-redundant tolerant modes. Furthermore, position servo...

This article proposes a new diagnostic method based on average current Park vector (ACPV) for single and dual power switch open-circuit faults of six-phase fault-tolerant permanent magnet synchronous motor (FTPMSM) system, which can be applied the system both in nonfault fault tolerant operation conditions. The diagnosis structure is composed two parts: ACPV moduli-based detection polarity-based location. By analyzing before after fault, normalized proposed by using components three...

A fuzzy-based optimal approach to robust control design is proposed for interconnected uncertain systems with mismatching conditions, which were previously unavailable. The system contains uncertainty, may include initial unknown parameters and input disturbance. uncertainty bound lies within a prescribed fuzzy set. does not satisfy the matching condition. in this paper consists of scheme gain optimization. new first proposed, whose structure deterministic if-then rule based. problem then...

To improve the heat dissipation performance, this paper proposes a novel hybrid cooling method for high-speed high-power Permanent Magnet assisted Synchronous Reluctance Starter/Generator (PMaSynR S/G) in aerospace applications. The structure with oil circulation housing, spray at winding ends and rotor end surface is firstly proposed PMaSynR S/G. Then accurate loss calculation of S/G proposed, which includes air gap friction under cooling, copper loss, stator core permanent magnet eddy...