The structure and control strategy of a novel two-phase brushless main exciter (ME) are proposed in this paper to solve the excitation problem generator (MG) when aircraft wound-rotor synchronous starter/generator start up as motor. Two-phase symmetrical winding is adopted field ME supplied with ac by inverter starting mode dc traditional unit generation mode. In order make current MG remain constant during start-up process, method for proposed, which contains feedback currents speed...

This article presents a low-measurement effort and less storage space but an effective method to reduce the torque ripple. First, torque-balanced measurement is presented obtain flux-linkage characteristics at four positions. Then, four-order Fourier series model proposed describe entire characteristics. To space, polynomial-Fourier current from rotor position flux linkage. Based on model, novel predictive control (MPTC) implemented minimize ripple with flux-linkage-based estimation....

This paper proposes a hybrid sensorless control strategy for rail transit application employing interior permanent magnet synchronous machine (IPMSM), which works under low switching frequency. Due to long system time delay, the convergence rate of estimated position in dynamic region is reduced. As speed increases, dq axes currents coupling more severe, and deteriorates performance. In order solve these problems, analysis time-delay effect on IPMSM drives first derived. Then, using q-axis...

Accurate information about the field current of wound-rotor synchronous starter generator (WRSSG) is prerequisite for optimal start control research WRSSG in starting mode. However, as winding rotating parts and there no slip ring brush mounted shaft, measurement not possible. A estimation method from brushless exciter side was proposed this paper. In method, rotor currents voltages asynchronous were first estimated then used to calculate through parametric average-value model rectifier....

This study proposes a novel mathematical model based on excitation system output equations (ESOEs) to evaluate the steady‐state performance of three‐phase brushless asynchronous (BAES) wound‐field synchronous aircraft starter–generator system. The could be used field current capabilities BAES and provide reference for control schema BAES. However, has unknown multivariable non‐linear characteristics, which give rise difficulty in modelling performance. Meanwhile, without closed‐loop main...

An integrated starter/generator based on the wound-rotor synchronous machine is becoming increasingly popular in modern aircraft due to advantages of high safety and low cost maintenance. Constant field current for main generator (WRSSG) can simplify start control scheme distinctly starting mode. In order achieve constant generator, three detailed excitation methods two-phase brushless exciter WRSSG mode were proposed compared this paper. And these methods, feedback currents speed reference...

Wound-rotor synchronous starter/generator (WRSSG) has been widely adopted in the modern aircraft. The uncertainty of inductive saliency WRSSG (the may change, disappear, or reverse during starting process) makes it difficult to implement sensorless low speed region. This paper proposes a dual-machine injection method for control WRSSG, which is able eliminate dependency on machine rotor position estimation. Using multi-stage structure proposed method, high frequency (HF) voltage injected...

The rotating rectifier in the brushless synchronous starter/generator is more vulnerable than others. Therefore, fault detection of necessary. This article focuses on identification diode failures starter/generator. Traditional approaches based analysis from main exciter field current or machine output voltage may lose location information. To solve this problem, features rotor are analyzed. With a simple restructuring approach, magnitude ratio second harmonic to fundamental obtained by...

In this paper, the cross-coupling phenomenon in wound-rotor synchronous starter/generator system is studied. Due to armature reaction, excitation field dragged away from d-axis by magnetic and inductance L <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">dq</sub> exists. What more, also occurs field, it means not only mutual M xmlns:xlink="http://www.w3.org/1999/xlink">df</sub> between exists, but...

The changeable magnetic saliency of main machine (MM) in aviation three-stage stator/generator (ATSG) makes it difficult to implement the sensorless starting low speed region by saliency-based methods. To estimate rotor position ATSG (which is also MM), a novel estimation method based on harmonic currents exciter (ME) stator windings produced rotating rectifier proposed this article. sine and cosine functions without time delay are extracted from ME constant frequency signal sampling method....

The structure and control strategy of a novel two-phase brushless exciter were first proposed in this paper to solve the excitation problem main generator when three-stage synchronous starter/generator starts up. Two-phase symmetrical winding was adopted as field exciter, supplied with AC or DC by inverter. This new have advantages high efficiency easy compared traditional single-phase three-phase strategy. A prototype, based on an existing starter/generator, designed analyzed using FEA....

Persistent signal injection in traditional sensorless methods leads to loss, noise, reduction of the starting torque main generator (MG) brushless synchronous starter/generator (BSSG), and complicated demodulation methods. Moreover, reversible magnetic saliency MG multiple rectification modes rotating rectifier cause errors most existing solutions BSSG. To avoid these drawbacks, this paper proposes a novel method estimate rotor position for zero- low-speed operation. Since exciter (ME) are...

In rail transit application, the multimode pulsewidth modulation (PWM) is used to take full advantage of dc-bus voltage in wide speed range. To improve sensorless control performance interior permanent magnet synchronous motor (IPMSM) drives this condition, an overall system delay compensation method proposed for a hybrid position observer that combines simple square-wave injection with nonsingular terminal sliding mode observer. Due effect, currents and estimation are deteriorated, such as...

The brushless excitation structure characteristics of the aviation wound-rotor synchronous starter/generator (WRSSG) put forward requirement on exciter (BE) model that both stator and rotor windings can be interfaced with external circuit directly. In this paper, a double-side variable-parameter voltage-behind-reactance (DS-VP-VBR) BE considering magnetic saturation was established firstly to realize direct connection between circuits. Then, constant-parameter VBR (DS-CP-VBR) completely...

Signal injection degrades the starting performance of brushless synchronous starter/generator (BSSG), and reversible magnetic saliency main generator (MG) leads to failure for most traditional sensorless methods. A novel full-speed control method BSSG is proposed solve these problems. The exciter (ME), mechanically coupled MG, used as a position sensor MG at low speed. ME extracted from hexagonal trajectory rotor current space vector then converted into rotation angle MG. At standstill, fast...

In rail-transit application, the multimode synchronous pulsewidth modulation (PWM) strategy is widely used to achieve better control performance in middleor high-speed region, which brings challenges sensorless that can enhance system robustness. Within modulation, a regular 21-pulse space vector PWM and selective harmonic elimination are selected analysis influence of modes transition on an interior permanent magnet machine (IPMSM) drives. When carrier ratio less than 10, as occurs between...

Accurate and timely fault diagnosis of the rotating rectifier in wound-rotor synchronous starter-generator (WRSSG) plays an important role improving reliability WRSSG system. By analyzing geometric features rotor current trajectory main exciter (ME) under health different conditions rectifier, this article, a method for based on ME is proposed. In method, currents are estimated first, then center distance, angle, length-width ratio calculated used to detect occurrence, locate faulty diode,...

This article proposes a rotor position estimation method for brushless electrically excited synchronous starter/generator (BEESSG) at low speed region. Based on the multistage characteristics of BEESSG, two high frequency pulsating voltages with different frequencies are injected into phase <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$\alpha$</tex-math></inline-formula> and...

Due to the reliability problems of mechanical position sensors, rotor estimation technology is an alternative for starting control aircraft wound-field synchronous starters/generators. Reversible saliency and high-frequency attenuation characteristics main machine (MM) may lead failure existing signal-based methods. In this article, low-frequency signal (LFS) injection a novel extraction method are combined estimate position. First, LFS injected into MM's stator winding, response containing...

Wound‐rotor synchronous starter‐generator (WRSSG) has the advantages of less volume and weight, high safety low cost in maintenance, so it is becoming increasingly popular modern aircraft, especially for more‐electric aircraft. The main machine (MM) exciter (ME) aircraft WRSSG are electromechanically coupled seriously, which makes start control complex starting mode. In this study, a decoupling method based on field current estimation proposed to solve serious coupling problem improve...

This paper proposes a novel on-line rotor position estimation method for an aircraft wound-field synchronous starter/generator (WFSSG) in the low-speed region. The is based on fact that mutual inductance between stator and windings of main machine (MM) varies with position, so it independent magnetic saliency. High-frequency (HF) rotating voltage imposed MM, information extracted from HF response current signals exciter (ME) WFSSG. Theoretical expressions containing ME are derived. Then,...

Based on the differences between waveforms of asynchronous exciter three-phase armature currents with rotating rectifier under various working conditions (healthy and open-circuit conditions), a fault diagnosis method is proposed in this article. To describe these differences, conceptions ratio, residual, sum are defined, corresponding calculation functions created. Through analysis current five categories conditions, ratios residuals calculated by observing which type can be confirmed. Then...

During on-load starting process of an aviation wound-field synchronous starter/generator system, accurate rotor position information is required. Mechanical sensor susceptible to interference, increasing volume and weight, so online estimation more desirable. Harmonics main exciter (ME) caused by rotating rectifier are analyzed, the fifth harmonic used creatively estimate in this article. In method, performing coordinate transformation on stator current ME, increment extracted obtained...

In the inductive charging scenario of an electric vehicle (EV), charger should have capability to flexibly regulate output power regardless misalignment and EV battery voltage. This article proposes a hybrid voltage frequency tuning strategy for series-series (SS) transfer (IPT) system through 0 3.3 kW at any voltages conditions without using additional converters. A is used achieve full-power partly contribute reducing power. When input achieves lower limit, further decrease W, achieving...