The fractional slot concentrated winding permanent magnet synchronous machines (PMSM) are widely investigated in recent years. electromagnetic performance of traditional 24-slot/20-pole surface-mounted PM machine (24/20-SPM) and SPM with consequent pole (CP) used for in-wheel motor drives electric vehicle (EV) applications is quantitatively analyzed compared by finite element analysis (FEA). shape the PMs 24/20-SPM rotor designed as eccentric (24/20-ECP-SPM) 24/20-CP-SPM tile (24/20-CP-SPM)....

Similar to conventional permanent magnet machine, consequent-pole (CPM) machines without special design suffer from large torque ripple, which will lead vibration and noise. This paper employs shifting suppress the ripple of CPM machine. Magnet can change phase magnets reduce harmonics torque. It is found that different angles orders harmonic, whilst directions has slight influence. However, average loss inevitable after shifting. Therefore, assisted flux barrier introduced in rotor...

Along with the higher requirement of aircraft's generation system proposed, Integrated Starter Generator appeared on stage history which can work as an electric motor and a generator at same time. This paper talks about Permanent Magnet Machine (PMM) is applied (ISG) used into unmanned aerial vehicle (UAV). has superiority in high-efficiency compared other motors such Squirrel-cage Asynchronous Motor. Moreover it advantages excellent starting performance starter quality when works state...

This paper presents the current application situation of five-phase permanent magnet synchronous motor and control algorithms. The mathematical model is established through coordinate transformation, meanwhile linear decoupling equation PMSM state also derived, two-vector algorithm (NTV-SVPWM) four-vector (NFV-SVPWM) are discussed especially. A modified introduced to alter content third harmonic in a3/ß3space, which used improve torque performance motor. Simulation results verify...

Sensorless operation based on third harmonic back-EMF has the advantage over fundamental such as free of pulse width modulation (PWM) noise and less influenced by variation parameters machine. In order to achieve instantaneous rotor position speed, a phase-locked loop (PLL) is always proposed, in which its integration taken input signal. However, direct may result integral drift saturation. To avoid circumstance high-resolution position, an improved PLL structure introduced this paper. It...

Abstract The unstart phenomenon of supersonic inlets caused by backpressure is dangerous for aircraft during flights because it severely reduces the air mass flow rate through engine. We used unsteady numerical simulations to evaluate and restart characteristics a two-dimensional inlet rapid changes. effects depressurisation time value on features are discussed. results show that affects procedure when back pressure drops from normal working state value. When decreases, becomes easier...

This paper presents a CP spoke type PM structure with optimal pole arc to improve the output torque without deteriorating performance of machine. Compared surface-mounted (CP SPM) machine, flux-enhancement capability for improving maximum is analytically derived and conformed by finite-element analysis (FEA). Furthermore, unipolar end leakage flux machine can be eliminated effectively. For traditional SPM, V interior (IPM) PM, electromagnetic performance, including air-gap density,...

Compared to the conventional three-phase permanent magnet (PM) machine, multi-phase PM machine has better fault tolerant capability. In this paper, a fault-tolerant control strategy for five-phase synchronous (FPMSM) is proposed based on current compensation by utilizing third harmonic frame. The key of method redefine in subspace and realize normal vector system. Four coefficients are utilized describe relationship between fundamental reference different open-circuit conditions. Values...

In this paper, the sinusoidal + third (Sin+3rd) harmonic shaped PM is used to suppress high torque ripple of consequent-pole machine (CPM). This paper will introduce general development status CPM and research actuality machine. The parameters conventional Sin+3rd be optimized by 2D finite element analysis. Moreover, optimal results air-gap magnetic flux density, cogging torque, waveform different machines compared analyzed in paper. show that PMs adopting shaping can reduce further improve...

The traditional three phase permanent magnet machine has poor fault-tolerant capability. In this paper, the tooth and stator offset are proposed to achieve better This paper introduces structure of (TPM), with unequal widths tips (UT-FTPM) (STO-FTPM). Their electromagnetic properties, including output torque, self-inductance mutual inductance, compared analyzed.

In recent years, dual three-phase PMSM has been widely studied for its high power density and reliability. However, in the traditional model predictive current control, large voltage vector will cause torque ripple. this paper, a new extended virtual control strategy is proposed to reduce ripple while maintaining low switching frequency. The simplified selection method adopted, computational complexity reduced. Experimental results verify effectiveness of method.

Hybrid excitation synchronous generator(HESG) inherits the high power density and efficiency of permanent magnet machine(PMSM), solves problem that air gap magnetic field PM machine is difficult to adjust. Because winding added HESG, its control system has characteristics strong coupling, multi-dimensional multi variable, so it control. Firstly, this paper establishes mathematical model AC excited HESG analyses regulation mechanism. In addition, a voltage strategy for AC-excited proposed...

The control quality of the servo system is mainly characterized by high precision and fast response speed, so structure outer loop permanent magnet synchronous motor as position can meet this demand. However, when meets requirements response, there are problems uncontrollable speed or rough control. To solve problem, paper simplifies system, proposes a strategy applied to rail transit door based on traditional current structure. be controlled setting realized according calculated absolute...

Dual three-phase permanent-magnet synchronous motor (DTP-PMSM) has more variables to be controlled. Thus, the consequent high computation burden brings challenges implementation of some high-performance control strategies, such as generalized predictive (GPC). In this paper, an interleaved current scheme based on GPC is proposed for a DTP-PMSM, release contradiction between performance and burden.

The influence of magnet imperfections on the torque ripple 12-slot/8-pole surface-mounted permanent (SPM) machines are investigated in this paper. Both double layer and single winding connections considered under five different N-pole PM diversity cases. Different from ideal condition (no diversity) where only <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$24n$</tex> ( xmlns:xlink="http://www.w3.org/1999/xlink">$n$</tex> is a positive integer)...

This paper investigates the influence of stator flux barriers on short-circuit current (SCC) and braking torque dual three-phase permanent magnet (PM) synchronous machine. In order to achieve high output fault-tolerant capability, are commonly introduced armature teeth. Firstly, SCC is analytically derived it found that amplitude proportional PM linkage inversely self-inductance. The square Then, equivalent magnetic circuit model established. Its inductance analyzed, improvement mechanism...

This paper proposes a novel AC-field hybrid excitation DC (AC-HEDC) generator, in which the AC field winding is located on stator to achieve brushless excitation. The spoke-type permanent magnet (PM) rotor employed improve flux per pole and thus power density due its strong flux-focusing effect. Furthermore, PMs segmented by multilayer bridges are designed obtain parallel path of PM flux, beneficial for regulation reduction eddy loss demagnetization risk PMs. Then, electromagnetic...

The influence of magnetization on the electromagnetic performance in surface-mounted permanent magnet (SPM) machine with sinusoidal+3rd harmonic shaped rotor is investigated this paper. flux density, cogging torque, phase back-EMF, torque and loss are analyzed by finite element (FE) method. differences between machines parallel radial manners illustrated. It found that can produce high but also accompanied ripple compared to magnetization.

This paper compares the electromagnetic performance of three phase 24-slot/8-pole surface-mounted permanent magnet (SPM) machines with various shapes, in which overlapping winding is employed. The magnets (PM) on rotor are designated as conventional one, sine shape, and shape third harmonic injection. It found that compared Sine-shaped PMs, average torque Sine+3rd-shaped PMs can be improved by>9% but cogging increases. increased reduced by optimizing configurations such width slots, yoke...

In this paper, we present a novel method for implementing three-loop control of motors using digital signal processors (DSP). We introduce fast current loop algorithm (FCL) to enhance the performance servo motors. The three separate loops include position, speed, and respectively. implemented TI C2000 series DSP conducted laboratory testing. By comparison with traditional methods, proposed exhibits higher response lower overshoot greater resistance external disturbances system parameter...

In recent years, hybrid excitation machine (HEM) drawn much attention due to their preferred flux regulation than permanent magnet (PM) machine. The integrated-induction-based HEM (II-HEM) achieves both the brushless and flexible while high space utilization is obtained. This paper aims quantitative comparison of capability between novel II-HEM adopting consequent-pole PM rotor conventional counterparts spoke-type rotor. principle two II-HEMs are revealed based on equivalent magnetic circuit...