In this paper, a robust adaptive sliding-mode observer (SMO) is designed based on the surface permanent-magnet synchronous machine (SPMSM) model in rotor reference frame (γδ-axis), and an online inverter nonlinearity identification compensation method proposed. order to reduce chattering of SMO, law presented help estimate back electromotive forces SPMSM; thus, smaller gains can be set for switching functions SMO. The small-signal proposed sensorless scheme derived analyzing steady-state...

For the purpose of reducing cost and volume, techniques reconstructing three-phase currents through a single current sensor have been reported for permanent magnet synchronous motor vector control system. In existing studies, reconstruction precision is largely affected by dead zones in space PWM plane, which requires additional efforts to compensate either modifying pulse width modulation (PWM) strategy or phase-shifting signal. this paper, novel zero voltage sampling method (ZVVSM)...

This paper aims to clarify global and local force harmonics their effects on vibration in permanent magnet (PM) synchronous machines. The includes both the tangential radial forces distributing stator bore while refers cogging torque ripple. First, expressions of are derived based periodicity magnetic field. relationship between is also established. Then, work continues with vibration. It found may induce remarkable lateral motion when mounting stiffness low, main combined effect inducing At...

In the context of distributed generation and renewable energy penetration toward smart grid, grid-connected inverter with LCL filter has drawn many attentions, whose current control conventionally requires several sensors to realize active damping grid synchronization. this paper, a novel full status observation strategy based on extended state observer (ESO) is proposed using feedback only without voltage sensor. The contains transformation process. Unlike conventional Luenberger observer,...

Dual three-phase (DTP) permanent magnet synchronous machines (PMSM) have been utilized in many applications due to their outstanding performance. However, large stator current harmonics limit the further application of DTP-PMSM low impedance harmonic subspace. To solve this problem, article proposes a suppression strategy based on an extended state observer (ESO). A detailed analysis is carried out demonstrate disturbance rejection ability and robustness proposed method. The theoretical also...

To promote the control performance of modern high-precision permanent-magnet synchronous motor (PMSM) system on existence time-delay and parameter mismatch, an improved deadbeat predictive current (DPCC) method is proposed in this article. First, conventional DPCC considering compensation introduced. Along with method, negative influence when mismatch occur analyzed mathematically. Afterward, article proposes a novel scheme based integral sliding mode (ISMC) theory for disturbance...

The aim of this article is an attempt to provide a more credible control mode or fault-tolerant strategy for permanent magnet synchronous motor (PMSM) drives when unexpected failure occurs the current position sensor. Considering that, sensorless method that uses only one sensor proposed. Different from traditional scheme utilizes additional sensors obtain information multiple phase currents, single (SCS) arranged on branches included among whole circuit. Three-phase currents are...

Accurate rotor position is essential for PMSM to execute vector control. The resolver and encoder have been most commonly employed, however, the bulk mass usually limit their further application in fields of aerospace robotic joints. This paper presents a sensor with minimum components, including linear Hall sensors an optimized permanent magnetic ring which can produce sinusoidal air-gap field. working principle discussed, errors its compensation are analyzed. Experimental results proved...

For the purpose of reducing cost and volume, as well to increase reliability in hostile environments, techniques reconstructing three-phase current through a single sensor have been reported for alternating motor vector control system. Based on phase reconstruction method, this paper proposes novel open-circuit fault diagnosis method low-power voltage source inverter permanent-magnet synchronous drive. Other than sampling dc-link sensor, zero (ZVVSM) is adopted implement diagnosis. By...

This paper proposed a novel hybrid random pulsewidth modulation (HRPWM) technique based on the modified space vector PWM for three-phase voltage source inverters to eliminate acoustic noise. Due and switching losses considerations, ear-piercing high-frequency noise from motor is common. The HRPWM able remove unpleasant more effectively than conventional RPWM with lower shorter frequency range. In addition, harmonics in phase current are reduced significantly. method simple implement does not...

Current sensing techniques with reduced number of sensors attract a high interest from industry, for the possibility cost reduction and sampling mismatch reduction. This article puts forward new single current sensor (SCS) method permanent magnet synchronous motor three-phase reconstruction, novel hybrid pulsewidth modulation (PWM) technique introduced. is implemented by changing position SCS dc bus to branch, modified space vector PWM employed realize phase reconstruction. Compared...

A novel robust deadbeat predictive direct speed control (RDP-DSC) method for permanent magnet synchronous motor is proposed to improve the bandwidth and eliminate conventional cascaded structure. First, basic DP-DSC with one-step ahead time delay compensation introduced briefly. Then, sensitivity analysis issue on electrical mechanical parameter mismatches, external disturbance inverter nonlinearity are inspirationally discussed. Further, based above, a dual second-order sliding-mode...

Random telegraph noise (RTN) is one of the important dynamic variation sources in ultrascaled MOSFETs. In this paper, recently focused ac trap effects RTN digital circuits and their impacts on circuit performance are systematically investigated. Instead occupancy probability under dc bias condition (p <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">dc</sub> ), which traditionally used for characterization,...

The magnetic field computation and performance characteristics analysis for a tubular transverse flux machine (TFM) with permanent-magnet excitation have been discussed. following issues emphasized: construction of the TFM, distribution, winding back electromotive force, inductance, thrust force. topology such requires 3-D finite-element method to accurately predict performance. simplified model is proposed in order save computing time. experimental setup has developed. calculated results...

The characteristic variability in gate-all-around (GAA) Si nanowire (NW) metal-oxide-semiconductor field-effect transistors (SNWTs) is analyzed and experimentally investigated this paper. First, the main variation sources SNWTs are overviewed, with detailed discussion on specific of NW cross-sectional shape variation, random dopant fluctuation source/drain extension regions line-edge roughness (LER). Then, following measurement-modeling approach, via calibrated statistical simulation that...

This paper aims to disclose the noticeable effect of local tangential force on vibration performance in fractional-slot concentrated-winding permanent magnet synchronous machines (PMSMs). The mechanism induce vibrations by is revealed at first. It found that able deflect yoke through tooth's lever arm effect. phenomenon detailedly explained finite element simulation and analytical description microscopic deformation this paper. With aid a 10-pole/12-slot PMSM, quantitative contribution also...

In motor drive system, ear-piercing acoustic noise caused by high-frequency vibration from becomes unacceptable in sensitive environments, due to the application of pulsewidth modulation (PWM) and consideration switching losses. this paper, a novel method which associates presented dual three-phase permanent magnet synchronous (PMSM) called dual-branch PMSM with carrier phase-shift technique is implemented completely reduce odd-order PWM frequency vibration. The proposed has two no windings,...

This paper has focused on the novel space vector pulse-width modulation (SVPWM) strategy for two-level three-phase inverter, which could eliminate harmonics nearby pulse width (PWM) frequency. Ear-piercing high-frequency electromagnetic noise from motor is common due to PWM technique. The proposed SVPWM able remove located frequency and other odd multiples by changing original switching states. unpleasant acoustic be removed with whose selected near 10 kHz. By comparison, it 20 kHz...

Inverter nonlinearity and sampling current dc bias can cause harmonic distortion of estimated back electromotive forces (EMFs), therefore results in position estimation error degrades control performance model-based sensorless techniques permanent-magnet synchronous motors, especially low speed region. In this paper, the effects inverter on EMF are analyzed. A voltage feedforward compensation method based an iterative learning (ILC) algorithm is proposed it used to eliminate harmonics EMFs...

In order to improve the efficiency of permanent-magnet synchronous motor, which is closely related its magnet shape, we have designed magnets in various shapes. A parallel top sine wave design has proved be an optimum plan. This adds three time components induced phase voltage, enables amplitude line voltage increase about 14.9%. The design's simplified approximate arc configuration important engineering applications.

In this paper, an analytical model for parasitic gate capacitances in gate-all-around cylindrical silicon nanowire MOSFETs (SNWTs) is developed the first time. A practical 3-D architecture of SNWTs with surrounding-gate channel and source/drain extension regions taken into account capacitance modeling. The SNWT are divided four parts: 1) outer fringe <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">C</i> <sub...

This paper proposed a novel method for two-segment three-phase motor to eliminate the harmonics nearby pulsewidth modulation (PWM) frequency. Due PWM technique and switching losses considerations, ear-piercing high-frequency electromagnetic noise in drive system is common. By using magnetically coupled inductors (MCIs) interleaved technique, able remove located frequency other odd multiples motor. With this method, unpleasant acoustic could be removed when selected near 10 kHz. The size of...