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This paper presents a performance comparison study between the space-vector and carrier-based PWM techniques used for neutral point clamped (NPC) 3-level inverter. A reduced switching loss based modulation technique is used for the SVPWM scheme and a third harmonic injected PWM technique is used for the carrier-based PWM scheme. A 110 kW surface-PMSM is used with the NPC inverter, as generally being...
The paper deals with a drive system of experimental fully electric airplane VUT 051 RAY with rated power 55 kW. The requirements on accumulator capacity and its weight were defined according to a precisely specified flight profile. The whole design process of traction inverter is presented. Drive train system of electric airplane was completely tested, before its final installation into fuselage of...
This paper proposes a method for independent drive of two permanent magnet synchronous motors (PMSMs) fed by a single five-leg inverter (5LI) based on reducing peak current of common leg. The advantages of 5LI are reduced size, volume, reduced number of devices, and increased efficiency due to total lower losses. The conventional method that has been used for controlling two PMSMs sends a large amount...
In this paper two operating modes available for permanent magnet synchronous machines (PMSM) are presented. This study aims to increase the efficiency of the motor-pump system. The PMSM is driven at variable speed and the inverter is controlled by space vector modulation theory. This study allows changing the component that produces magnetic flux (id), while the torque current component of PMSM (i...
The paper presents a comparative study between two operating modes for a permanent magnet synchronous motor (PMSM) at variable speed, in order to obtain a better efficiency. The aim is to find the best operating mode for a pumped storage system supplied by variable renewable energy sources (RES) energy based source. The study includes several PMSMs with rated speed of 1000 rpm, from power ranged between...
This paper addresses the method of detailing the motor system including the inverter and the boost converter of plug-in hybrid vehicles (PHVs). In the past, we had to use the actual measurement data such as efficiency map to calculate the loss of a motor system. However, by estimating the output current of the motor system, allows us to separate the one loss into losses caused by the inverter, the...
In this paper, a direct torque hysteresis controller (DTHC) driving a permanent magnet synchronous machine is discussed. A two-level, three-phase conventional inverter is used as means of power conversion. Advantages such as a low switching frequency as well as further opportunities of the DTHC are specified. The simulation results show a high degree of potential for the DTHC in future applications.
A new method for Flux Weakening (FW) of Surface Permanent Magnet (SPM) motors is proposed in this paper. This method is termed a dual inverter-fed drive system with winding switching which can significantly extend the field weakening speed range of SPM motors. As a particular design example, the proposed method can increase the maximum output power of a SPM motor by 73% without changing the battery...
This paper presents a novel DC-link voltage balancing algorithm for a 3-level DC/AC traction inverter drive. In this topology, two DC-link capacitor voltages and three-phase line currents are measured, to generate the control pulses for the traction inverter, based on space-vector pulse width modulation (SV-PWM) scheme. Depending on the states of the two DC-link capacitors, redundant voltage vector...
A modified DC-link voltage balancing scheme for a three-level neutral point clamped inverter (NPC) with an interior permanent magnet machine (IPMSM) is presented. It uses two DC-link voltage sensors to take care of the voltage differences, and keep it to a required tolerance level. Switching control strategy is developed using a space-vector pulse width modulation (SV-PWM) scheme. Number of switching...
A maximum efficiency control for a dual-motor drive system is presented in this paper. The torque sharing between two motors is optimized by using the perturbation and observation method. A fuzzy-logic controller is implemented for the perturbation and observation method. As a result, the step of perturbation can be adaptively modified to improve the performance. In addition, a simple calculation...
A modified DC-link voltage balancing scheme is proposed, which keeps the two DC-link capacitor voltage differences at a desired level for wider load variation and for low power factor. Moreover, the proposed control strategy uses a reduced number of switching sequences compared to conventional DC-link voltage balancing strategy, which helps to reduce the switching losses. Effects of low power factor...
Power electronics (PE) are an important technology for energy saving. However, PE apparatuses may emit electromagnetic interference (EMI) originated from the switching operation of power semiconductor devices. When EMI occurs in a system that includes many PE apparatuses, it is not easy to determine which one is the noise source. This paper applies high-speed sampling and signal-processing technologies...
An Open-Winding machine drive with a floating capacitor attached to one of the inverters has been demonstrated to be capable of extending the operating space of permanent magnet machines under a given power supply voltage limit. This paper applies this open-winding motor drive topology to electric vehicle application. The properties of this topology including sizing and efficiency are further investigated...
The variable frequency speed control of permanent magnet synchronous motor with its superior speed and the braking performance is increasingly used in industrial production and daily life. But also for the vibration of the permanent magnet motor adopts inverter power supply noise performance brought a lot of unfavorable factors. Vibration and noise is an important performance index of the permanent...
In this paper, the current characteristics of the mono inverter dual parallel (MIDP) surface mounted permanent magnet synchronous motor (SPMSM) drive system are analyzed and the control method for stable operation is proposed. While driving parallel connected two induction machines with a single inverter is not difficult thanks to the inherent slip, driving parallel connected synchronous machines...
A performance comparison study for two proposed DC-bus voltage balancing algorithms is carried out, with a three-level NPC based permanent magnet synchronous machine (PMSM) drive for the electric vehicle propulsion application. Both the control algorithms are able to keep the two DC-link capacitor voltage variation within a tolerance level with wider range of speed and torque variation of the load...
In this article, we propose a new online efficiency optimization method for interior permanent magnet (IPM) synchronous machine drive. In this new method, we apply a non-model-based optimization method - extremum seeking control method - to determine the optimal values of control variables such that system efficiency is optimized. Our method minimizes the power loss of both IPM motor and inverter...
This paper presents a method for reducing a motor torque ripple resulting from a motor phase current sensor offset error for motor drive applications such as a hybrid electric vehicle. The proposed method estimates the motor phase current sensor offset error on the basis of the direct voltage value included in the voltage source inverter output voltage reference value calculated by a discrete Fourier...
In this paper a detailed analysis on torque ripples of brushless dc drives in both commutation and conduction region is given. A neoteric method for the elimination of torque ripples in BLDC motor by employing PWM_ON_PWM scheme has been introduced by the addition of a buck converter in the entrance of the inverter. PWM_ON_PWM strategy is mainly applied to compensate the commutation torque ripples...
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