A single closed-loop inverter drive with multiple motors connected to it is a type of topology commonly used in steel processing industry, electric railway systems, and vehicles. However, condition monitoring for this configuration remains largely unexplored. This paper proposes an impedance identification approach detect locate the stator turn-to-turn fault multiple-motor system. Sensitive fast detection achieved by utilizing characteristics current regulators motor controller. Experimental...

This paper proposed a temperature-dependent iron loss model and corresponding dynamic hysteresis model, where temperature coefficient k is introduced to consider the thermal effect on eddy-current loss. The validated by massive experimental measurement of test samples, 1174 combinations various temperatures, magnetic inductions, frequencies for nonoriented silicon steel specimen. relative error ~11% in wide range 50-400 Hz, 26 °C-200 °C, 0-2 T. method can be applicable other types materials...

For the battery super-capacitor hybrid energy storage system (BSHESS) applied to electric vehicle (EV) or (HEV), bidirectional dc-dc converter (BDC) is key component control flow between and super-capacitor. To reduce internal loss of BSHESS, efficient BDC with soft-switching characteristics best choice. In this paper, through analyzing several existing BDCs, a new coupled inductor based proposed. This has simple structure no auxiliary switch can provide conditions for both switches without...

This paper proposes a novel circular winding brushless dc (CWBLDC) motor, which offers high torque density as BLDC motors and low-torque ripple permanent-magnet synchronous machines (PMSMs). The novelty of the proposed machine is circularly connected windings its way commutation, make it suitable for high-power high-performance marine propulsion applications. First, structure operation principle CWBLDC are described. method calculating phase current subsequently introduced validated by...

Closed-loop induction motor drives have wide applications in electric traction system and industrial processes. Accurate thermal monitoring not only protects the machines from overheating, but also boosts usage performance of overall drive system. State-of-the-art schemes for utilize models, which are inaccurate drive-fed adaptive to varying cooling conditions. This paper proposes a nonintrusive scheme motors fed by closed-loop inverter drives. By applying offsets current controllers drive,...

This paper proposes two thermal monitoring methods for induction machines with direct torque control (DTC). The stator resistance Rs is used as a indicator of average winding temperature and estimated via dc current offset in the winding. In DTC drive system, major challenge how to excite only existing flux loops. quantitative relationship between desired corresponding changes linkage derived, this shows that can be achieved either by superimposing bias command [ ΔΨ <sub...

In this paper, a soft-switching topology is proposed for the bidirectional dc-dc converter. order to achieve conditions, auxiliary circuits including small inductor and two capacitors are introduced By generating keeping recycle current in circuits, can provide conditions both switches of converter fixed frequency control application. Meanwhile, no introduced. Due existence also reduce ripple main inductor. Based on method, family topologies derived. These have similar structures same...

Owning to its extremely long endurance, small size, cost-effective employment, easy, and fast transported properties, the merits of autonomous underwater vehicles (AUVs) exceed those manned vehicles. Therefore, it has become an indispensable member in navies throughout world, as well with oceanographic research, commercial resource explorations, especially search rescue (SAR) sectors. Up date, tragic MH370 QZ8501 flight incidents have dramatically increasing awareness high-performance SAR...

High-frequency vibration and noise induced by pulsewidth modulation (PWM) deteriorate the acoustic performance of permanent magnet synchronous motor (PMSM) drives. Periodic-carrier-frequency PWM (PCFPWM) is an effective method that can disperse high-frequency harmonics to a wider frequency band, thereby suppressing peak harmonic. This article presents detailed study on how exactly PCFPWM affects both low-frequency vibrations PMSMs. It revealed actually deteriorates motor, due unwanted side...

Synthetic biology revolutionizes our ability to decode and recode genetic systems. The capability reconstruct flexibly manipulate multi-gene systems is critical for understanding cellular behaviors has significant applications in therapeutics. This study aims construct a diverse library of synthetic tunable promoters (STPs) enable flexible control expression mammalian cells. We designed constructed that incorporate both universal activation site (UAS) specific (SAS), enabling multi-level via...

A 15-phase induction machine supplied by voltages with third-order harmonic injection has nonsinusoidal magnetomotive forces distribution. This paper introduces a distributed magnetic circuit approach to perform calculations in order determine the magnetizing inductance for both fundamental and third-harmonic component. The proposed divides half-pole or one-pole model into large number of fan-shaped sectors. air-gap flux densities all sectors are then solved iteratively. inductances...

By measuring 13 grades of neodymium (NdFeB), we obtained their temperature-dependent magnetic properties from 25 °C to 120 °C. Furthermore, a piecewise linear hysteresis model for NdFeB magnet is generalized one, where temperature coefficients are introduced consider deterioration performance due rising temperature. The movement working point on loops when changes discussed. validated by massive experimental measurement specimens. accuracy the about 5% in range °C-120 proposed can be applied...

High-frequency vibration caused by pulsewidth modulation (PWM) is a critical problem of permanent magnet synchronous motor drives for low-noise applications. Periodic carrier frequency PWM (PCFPWM) can effectively reduce high-frequency vibrations dispersing concentrated harmonics over wider band. However, the resulting spectra are normally far from ideal and still contain several local peaks because uneven response not taken into account. To address this problem, article proposes an optimal...

The Noise, Vibration, and Harshness (NVH) experience during driving is significantly influenced by the sound insulation performance of car floor acoustic package. As such, accurate efficient predictions its are crucial for optimizing related noise reduction designs. However, complex transmission mechanisms difficulties in characterizing absorption properties package pose significant challenges to traditional Computer-Aided Engineering (CAE) methods, leading low modeling efficiency prediction...

This paper presents a detailed design process of an ultra-high speed, switched reluctance machine for micro machining. The performance goal the is to reach maximum rotation speed 750,000 rpm with output power 100 W. rotor involves reducing aerodynamic drag, avoiding mechanical resonance, and mitigating excessive stress. stator focuses on meeting torque requirement while minimizing core loss copper loss. strength structure are both verified through finite-element simulations final 6/4 6 mm...

Switching-frequency vibration caused by pulsewidth modulation (PWM) is a critical shortcoming of permanent magnet synchronous motor (PMSM) drives in certain applications. This article reveals the mechanism for suppressing high-frequency multiphase surface (SPM) motors via PWM carrier phase shifting (CPS). The first introduces 12-phase SPM drive with three different modes CPS. Then, it presents an analytical method to calculate current harmonics as well flux and force distributions along...

The stator turn-to-turn short circuit is an important type of fault in automotive claw-pole generators. In a typical vehicle electric power system, the built-in rectifier generator makes it difficult to access ac current or voltage information, rendering conventional sequence-component-based fault-detection methods useless. To detect such using only available sensor dynamic model with turn faults derived this paper analyze how would interact connected battery and static full-bridge affect...

This paper proposes an improved signal-injection-based stator-winding thermal-monitoring method for field-oriented-controlled (FOC) induction motors. In this method, DC resistance is normally used as a direct indicator of winding temperature, and obtained from injected currents voltages in the motor winding. Conventionally, however, implementation DC-injection causes low-frequency torque ripple, which undesired especially high-performance applications becomes major disadvantage type scheme....

This article introduces a new method to analyze electromagnetic forces induced by pulsewidth modulation current harmonics in inverter-fed surface permanent-magnet motors. The concept of the permeance distribution function (PDF) is first introduced with its properties and relation machine inductances fully explained. Utilizing PDFs, two methods are proposed calculate flux on stator boundaries armature currents rotor permanent magnets, respectively. By superposing distributions from both...

The `claw-pole' type synchronous alternator is the heart of virtually all automotive Electric Power Generation and Storage (EPGS) system. Timely accurate detection faults will not only decrease "walk-home" incidences for drivers but also significantly misdiagnoses, thereby resulting in significant warranty cost savings auto manufacturers. This paper performs a general analysis on voltage current spectrum claw-pole alternators. Various harmonic components are explained from first principles....

Due to low space utilization rate of traditional magnetic field generator, an improved 3-D generator with compact structure and larger uniform region is proposed in this paper. Compared the Helmholtz coil, a pair auxiliary coil introduced each dimension. To design five model parameters need be optimized according user's requirement on uniformity. Finally, was built tested validate coils its method. Validation process shows that result fits desired one very well, maximum error only 0.12%....

Efficient and durable OLEDs of cyan, greenish yellow, yellow white colors were fabricated in simple structures with Pt–C py bonded complexes, giving state-of-the-art tuning the color electroluminescence.

The circular winding brushless direct current (CWBLDC) motor is a special type of multiphase permanent magnet motors with nonsinusoidal electromotive forces and circularly connected phase windings. does not rely on conventional pulsewidth-modulation inverters has high torque density low ripple, making it promising choice for high-power high-performance applications, such as marine propulsions. This paper studies the radial electromagnetic force CWBLDC motors. effect slot-pole combinations...

In this paper, 8 high induction soft magnetic rings of FeCoV alloy 1J22 is used to simulate motor core lamination during manufacturing process, such as punching, spark wire cutting, annealing, second annealing. different process procedures are selected among several combinations through comparative experiments, the influence processing on property analyzed. Preliminary results indicate that, punching and cutting will cause damage property, Wherein has greater impact, annealing allows a...

In this paper, the magnetic properties of non-oriented (NO) and grain-oriented (GO) silicon steels with dc-biased induction are measured analyzed within wide range 20-1000 Hz, 0-1.9 T. While by physical method, we found that all ac-, dc-, fields do not influence electrical resistivity steel, hysteresis loss is mainly responsible for iron increase when exists. With frequency ac going up, effect on will become weak. Compared NO GO steel more sensitive to induction. The validation shows...