In classical control of brushless dc (BLDC) motors, flux distribution is assumed trapezoidal and fed current controlled rectangular to obtain a desired constant torque. However, in reality, this assumption may not always be correct, due nonuniformity magnetic material design trade-offs. These factors, together with controller limitation, can lead an undesirable torque ripple. This paper proposes new method attenuate ripple BLDC motors un-ideal back electromotive force (EMF) waveforms....

Three-phase current reconstruction technique using dc information in conventional two-level inverters can be used for the purpose of cost reduction and sensor fault tolerance. A novel phase scheme, with reduced immeasurable area common mode voltage, is proposed this paper. tristate pulse-width modulation has been employed, which three adjacent switching states are to construct reference voltage. The active arranged at edge center a PWM cycle. Fixed sampling simultaneous three-phase currents...

SiC mosfets allow a higher frequency, lighter weight inverter over their Si counterparts for electric vehicle (EV) applications. However, using SiC-based EV traction inverters is likely to increase the shaft voltage in an ac motor drive system, which significantly affects reliability of system. This paper investigates impact high-speed switching devices and high frequency on common-mode (CMV) voltage. It theoretically illustrated experimentally demonstrated that increases amplitude voltage,...

Dead time significantly affects the reliability, power quality, and efficiency of voltage-source converters. For silicon carbide (SiC) devices, considering high sensitivity turn-off to operating conditions (> 5× difference between light load full load) characteristics inductive loads 2× motor inductor), as well large additional energy loss induced by freewheeling diode conduction during superfluous dead (~15% switching loss), then traditional fixed setting becomes inappropriate. This paper...

The deadbeat control is one of the widely concerned methods for permanent-magnet synchronous motor (PMSM) due to its fast dynamic performance. However, performance relies heavily on accuracy PMSM model parameters, which may vary with operation cases. In this article, a novel online parameter identification algorithm proposed control. First, an established estimate errors from offsets control, in nonlinearity voltage source inverter fully concerned. Then, "parameter perturbation method"...

In this paper, a new two-phase pulse width modulation (PWM) technique is proposed, in which the reference voltage constructed by three space vectors. At any speed, peak-to-peak value of common-mode (CMV) one PWM cycle can be reduced to third DC bus voltage, even despite dead-time effect. And low region, not only CMV but also current ripple restrained effectively. entire range, linear region limited and switching loss because fewer actions. The validity proposed verified through simulation...

Dead-time in the voltage source converter significantly affects reliability, power quality and losses. For SiC devices, considering high sensitivity of turn-off time to operating conditions (> 5× difference between light load full load), as well large extra energy loss induced by reverse conduction during superfluous dead-time (~ 15% switching loss), traditional fixed setting becomes inappropriate. This paper introduces an approach achieve optimum for based converter. First, behaviors under...

For electric vehicles (EVs), it is necessary to improve endurance mileage by improving the efficiency. There exists a trend towards increasing system voltage and switching frequency, contributing charging speed power density. However, this poses significant challenges for high-voltage high-frequency motor controllers, which are plagued increased losses pronounced oscillations as consequences of hard switching. The deployment soft technology presents viable solution mitigate these issues....

Zero -voltage switching (ZVS) is of great importance for high-efficiency dc/dc converters. In the dual active bridge (DAB) converter with extended phase shift (EPS) control, however, due to junction capacitance switches, ZVS region splits into two separated parts according its load degree. It has been found that applying variable frequency modulation (VFM) simply EPS can move rather than fill gap between areas. this article, a partition VFM proposed, which increases at heavy loads and...

This paper described the inherent local minimum problem and oscillations in presence of obstacles or narrow passages traditional potential field methods for mobile robots planar static environment. Based on character a flow water, this proposes new method obstacle avoiding trajectory using grid method. The main benefits are quickness computation compensation drawbacks belonging to general. initial position robot is assumed as an artificial headstream, then stream flows from high low. When...

This paper presents a new solution, which can completely remove the DC offset and compensate steady-state error for voltage model flux estimation in an induction motor (IM) direct torque control (DTC) system. The estimator has been paid more attention its clear concept simple signal processing, however, integration drift associated with inherent initial value input, especially low speed region, not be eliminated by conventional low-pass-filter (LPF), addition, LPF also brings amplitude phase...

A novel polarization-independent and tunable comb filter that consists of only one glass slab sandwiched between two gold films has been demonstrated. The greater than 12 dB channel isolation, less 0.2 insertion loss, accurate 0.8 nm spacing.

This paper presents a novel open-loop gate control of the turn-ON transient for SiC MOSFETs in hard switching conditions. The could reduce voltage overshoot and di/dt dv/dt independently. Because high speed, bring serious electromagnetic interference (EMI) half-bridge topology. A conventional driver decreases EMI by increasing resistor, but clearly loss. To address this tradeoff optimize transition, drain current slope drain-source are controlled independently controlling gate-source profile...

This paper proposed a dual half bridge (DHB) DC-DC converter used for ultra-capacitor power management in electric vehicles. Different from conventional DHB converters, PWM plus phase shift (PPS) control strategy is introduced here due to the variable voltage operation mandates of an ultra-capacitor. novel combination will be discussed following two aspects this paper. In theory level, minute principle analysis PPS based presented, and so ZVS. industry implementation firstly optimal rated...

Dual three-phase permanent magnet synchronous motors (DTPMSM) are used in the steer-by-wire system of electric vehicles that require high reliability. Multiple faults should be considered for steering system, such as open-circuit and speed sensor faults. However, current sensorless control methods dual motor mainly derived from promotion motor. They fail when an fault occurs, leading to failure fault-tolerant control. Researchers have noticed this problem proposed many methods, but they very...

In this paper, a segment phase-shifted carrier PWM method is proposed. According to the sector, modulation wave can be discontinuous with different zero sequence signal injected and are phase shifted, which from conventional SVPWM. Using technique, peak-to-peak value of common-mode voltage in one cycle reduced third DC bus at any speed, even despite dead-time effect. The good natural over characteristic performance high utility also researched. Furthermore, technique generalized obtain...

Deadbeat control calculates excitation by a differential equation model that takes measurements of state variables as initial values and instructions terminal values. Ideally, this can force to track in the succeeding interval. However, practical system, noises measured signals mislead system degrade its performance with increased ripples harmonics. Therefore, some filters are often used measurements, but their inherent delay lead inaccurate cause severe overshoots dynamic cases. In study,...

The common-mode voltage (CMV) in source inverter may seriously affect the motor drive system. It can be restrained with proper PWM method if only nonzero space vectors are used. In this paper, a vector technique (NZPWM) is proposed. Using method, three odd/even active low region, or adjacent high used to build reference vector. So entire modulation index range, peak-to-peak value of CMV reduced one third traditional SVPWM, which minimum theoretically. Some simulation and experimental results...

Based on the character of a flow water, this paper proposes new path planning method using potential grid method. The initial position robot is assumed as an artificial headstream, and then stream flows from high field to low. When target position, track forms feasible obstacle avoiding trajectory. Then, algorithm for constructing trajectory described. And has been simulation in long wall, recursive U-shaped, unstructured, cluttered, maze-like environment. results indicate that can overcome...

Voltage-Fed PWM inverters have problems of common-mode voltage. The effects over voltage are extremely problematic for everyday operations, such as damage to motor bearings, unexpected ground fault trips and premature insulation failure. There many modulation methods dual three-phase drive systems, the vector space decomposition method is one main methods. In order reduce system, this paper proposed a new based on TSPWM. compared with strategy, results simulation experiment presented prove effect.

Harmonics in back electromotive force (EMF) would greatly affect the accuracy of traditional sensorless control methods, and some them may even fail. Phase locked loop (PLL) is a useful tool for phase detection multiple-harmonic system, suitable system Interior Permanent Magnet Synchronous Motor (IPMSM) as it often filled with harmonics when motor not carefully designed. In this paper, Dual-PLL structure proposed to obtain fundamental harmonic quantities motor, which are used speed position...

High rate of variation common-mode voltage (CMV) brings problems to the pulse width modulation (PWM) inverter motor drive system. In this paper, a new two-stage CMV reduction PWM strategy is proposed. high region, peak-to-peak value reduced one third DC voltage, even despite dead-time effect. And in low both and current ripple are reduced. entire range, linear region not limited switching loss because fewer actions. Experimental results presented fully support above-mentioned claims.

The single current sensor operation (SCSO) is favorable for cost reduction and fault-tolerance purposes in three-phase inverter-driven systems. This paper addresses a SCSO method based on tri-state pulse-width modulation technique (TSPWM). It enables fixed sampling points with minimal hardware software requirements. Simultaneous three phase currents can be easily computed due to symmetrical sampling. No change TSPWM needed most working points, thus it maintains advantages common-mode voltage...

A method is proposed for reconstructing AC currents with a single DC side current sensor in three-phase motor drive system. The based on common-mode voltage (CMV) reduction PWM technique called LuPWM, which eliminates most of the invalid regions reconstruction both around zero and near active-vectors. It realizes fixed-point sampling favorable implementation. And prediction also easier than traditional methods. Furthermore, it remains good property LuPWM that peak-to-peak value CMV, leads to...