This paper describes a new control algorithm which can enhance the dynamics of sensorless system and gives precise performance. Instead conventional sinusoidal-type voltage injection, square-wave-type injection incorporated with associated signal processing method is proposed in this paper. As result, error be calculated without low-pass filters time delays, position estimation performance enhanced. Using method, enhanced; bandwidth current controller was enhanced up to 250 Hz, that speed 50 Hz.

The aim of this study was to develop a new method operate an interior permanent magnet synchronous machine (IPMSM) on the maximum torque per ampere (MTPA) condition. characteristics MTPA condition were analyzed and derived based input electric power. proposed injects small current signal used for tracking operating point along with fundamental generation. This does not require any parameters or premade lookup table. frequency injected is several hundred hertz, performance almost free from...

This paper presents a carrier-based modulation method for matrix converter. By using the offset voltage and changing slope of carrier, it is possible to synthesize sinusoidal input currents with unity power factor desired output voltages. The proposed equivalent so called space vector pulsewidth method. uses new point view understand converter such as source inverter (VSI) Using method, this two-phase/three-phase dynamic/steady-state overmodulation These methods are well developed in study...

This paper presents a sensorless control for induction machines, using square-wave voltage injection. Multiple saliencies are considered, as well saliency orientation shift according to loading conditions. These two nonideal phenomena severely degrade the performance of controls machines. cause position error signal become distorted and make estimation rotor flux difficult. Saliency causes estimated drift from actual position, depending on torque speed. In this study, algorithm based...

This paper proposes an identification method for induction motor parameters at standstill using integral calculations. The rotor time constant and magnetizing inductance are identified. During the process, to be tested is consistently excited according a predetermined current reference. Using current, emulates rated flux slip condition, even standstill. based on calculation so that results robust measurement noise. Based these features, result of proposed quite accurate, shows excellent...

This article proposes a new architecture for the hybrid distribution transformer (HDT) with partially rated power converter connected in series existing transformer. The proposed single-phase system is constructed by adding three-legged to transformer's primary side. Here, way two taps provides following advantages: 1) It possible reduce converter's rating, and 2) An additional current loop, which gives degree of freedom, added. For better quality, synthesizes voltage vector compensate...

This paper suggests a single-phase and single-stage battery charger for light electric vehicle to improve the lifetime by removing high voltage electrolytic capacitors. The proposed is based on diode-clamped series resonant converter equipped with valley-fill circuit, which increases power factor dead zones in line current reduces switching loss of circuit. feasibility has been verified 1.7-kW prototype.

This article proposes a magnetic flux saturation model that well represents the cross of synchronous reluctance machines (SynRMs) and parameter estimation method proposed model. Existing models do not satisfy reciprocity condition or express well. The consists terms for self-saturation saturation, it expresses nonlinear relationship between current SynRMs, as satisfies condition. data are obtained at standstill using hysteresis voltage injection method. Using data, parameters estimated....

This paper describes a new control algorithm which can enhance the dynamics of sensorless system and gives precise performance. When high frequency injection methods with conventional manners (sinusoidal voltage injection) are used, Low pass filters (LPFs) should be used to get an error signal. However, these LPFs degrade performances due time delay themselves. To avoid this effect, proposed method uses square wave type instead sinusoidal injection. As result, signal calculated without any...

This paper presents a new maximum torque per ampere (MTPA) control method for Interior Permanent Magnet Synchronous Machine (IPMSM) drives. The proposed uses the conventional speed scheme, where loop produces magnitude of stator current reference. According to angle in rotor reference frame, ¿, is decomposed d-/q-axis references. To operate IPMSM MTPA mode, this tracking using signal injection. works based on inherent definition MTPA, which that variation due should be zero at specific...

A matrix converter interfaces with three-phase ac voltage source, which creates three different virtual dc-link voltages. In this paper, a new pulsewidth modulation (PWM) method for the is proposed to generally use these By using two higher line-to-line voltages as voltages, can create identical switching sequences those created by conventional space vector PWM (SVPWM) method. Moreover, able select appropriate voltage, according purpose and/or load condition. adjacent output reference are...

The propulsion system of the electric-powered vertical take-off and landing aircraft requires a high level performances, including power density, efficiency, noise vibration harshness, fault tolerance. Among many types conventional electric motor, outer rotor surface-mounted permanent magnet synchronous motor (SPMSM) is widely used for its density low torque pulsation. However, these advantages are degraded when multiphase winding applied to secure fault-tolerance characteristics. To...

This paper presents an application of a disturbance observer for relative position control system. In this system, since the prefixed motion profile is not defined <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">ex ante</i> , acceleration state which generated based on also available. Therefore, feedforward controls cannot be used, and performance restricted solely by bandwidth controller. To enhance performance, observers can utilized actively....

This article proposes an offline compensation method for current scaling gains in the AC motor drive systems with three-phase sensors. Many articles have been presented about gain compensations of inverters. Most them can be adopted during rotations. Those were studied two-phase sensing. Applications, such as elevators and hoist cranes, generally measure currents directly using three sensors preparation a fault any one them. In this article, we present sensing system. analyzes effect errors...

This paper presents a new flux weakening algorithm for high saliency Interior Permanent Magnet Synchronous Machine. The proposed method modifies the current reference not by look-up tables, but controller in order to achieve weakening. modification is determined d-q axis and output voltage using gradient descent method. consists of two part, determination region modification. angle between constant torque direction decreasing direction, modified magnitude according region. Moreover, this can...

This paper presents the input power factor control method of carrier-based modulation for matrix converter. It is possible to synthesize sinusoidal currents with a desired and output voltages by changing slope carrier using offset voltages. In proposed method, are synthesized according current references considering factor. The converter under unbalanced conditions also suitable without any extra algorithm. feasibility has been verified computer simulations.

This article proposes a novel method to reduce rotor movement when estimating magnetic flux models for interior permanent magnet synchronous motors (IPMSMs) and reluctance (SynRMs). A rotation reduction technique that considers the saturation effect is proposed. hysteresis controller used inject voltages only into <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">q</i> -axis simultaneously xmlns:xlink="http://www.w3.org/1999/xlink">dq</i>...

This paper proposes a compensation method for inverter nonlinearity an accurate voltage synthesis. The is caused by dead-times, drops and switching delays parasitic output capacitance of semiconductor switches, propagation in the gate drive circuits. regards switches as dominant distortion factors. Analyzing those factors each leg, proposed compensates leg inverters. As result, voltages can be synthesized. Experimental results verify effectiveness method.

This article proposes an improved neutral-point voltage balancing control (NPVBC) with time delay compensation and antiwindup loop based on a dynamic change limit for three-level clamped (NPC) voltage-source inverter. NPVBC is essential NPC inverter since it has separate dc link. In the carrier-based pulsewidth modulation (CBPWM), (NP) regulated by synthesizing NP current. The conventional controller designed as proportional-integral controller; however, delays due to digital modulation,...

This article proposes a self-commissioning strategy to identify magnetic flux saturation characteristics of synchronous machines at standstill without rotor locking and the position sensor. The process is required machine's flux-linkage characteristics. An inverter feeds machine, where induced current data are gathered from multi-points. generates torque, including reluctance so that machine rotates. However, if moves, would be distorted since under assumption stands still. proposed method...

The conventional motion control system simply consists of a PID position controller and disturbance observer. estimated speed from the observer has been used to as feedback force, which is byproduct observer, reject disturbance. However, in this case rejection performance should be traded off with estimation performance. This paper explains trade-off using Bode analysis presents dual for application. proposed method uses two observers, where one dedicated other compensation. enhanced by...

This paper presents a new flux weakening algorithm for surface mounted permanent magnet synchronous machine. A current reference is modified by controller in order to achieve weakening. The modification determined the d-q currents and output voltage using gradient descent method. proposed method consists of two parts, determination region modification. angle between constant torque direction decreasing direction, magnitude according region. possible be applied infinite speed drive system as...