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This paper analyzes how the switching noise generated in the power section of common three leg inverters used to drive BLDC motor gives rise to common mode conducted emissions. Besides the identification of the primary sources of switching noise and the parasitic elements that usually play a key role in the propagation of such disturbances, a new method based on a tight control of the power MOS commutation...
To reduce energy consumption, a novel motor system was proposed using two individual current control technologies involving (1) a multiphase inverter and (2) a single-phase inverter. The multiphase inverter technology comprised two sets of three-phase windings connecting two three-phase inverters. Each set of coils connecting the three-phase inverters formed a rotating field. The two windings allowed...
Load commutated inverters with multiple three-phase configurations are widely used in high-power synchronous motor drives due to its robustness and reliability. However, harmonic problems, poor starting performance and the limited upper frequency are the issues to be addressed. In this paper, a novel six-phase inverter system, consisting of two main three-phase inverters and an additional five-level...
In this paper, the speed control for two series-connected five-phase permanent magnet synchronous motors (PMSMs) is first proposed where both speeds of two five-phase PMSMs can be controlled independently without any position sensors. In first, the concept of the extended electromotive force (EEMF) developed for single motor is extended for two series-connected five-phase PMSMs. Some experimental...
Africa is the major world region in which populations are deeply affected by water and electricity supply shortages, in spite being blessed with the highest world water aquifer reserves as well as advantageous solar irradiance that encourages harvesting of electricity using photovoltaic cells. This paper deals with the design and performances analysis of a three phase Quasi Z Source Inverter (QZSI)...
With reference to light railways transportation systems, in the paper a comparison is carried out between vehicles equipped with Induction Motor (IM) drives and Permanent Magnet (PM) brushless motor drives. The attention is particularly focused on the deceleration phase of the speed diagram, which consists of an interval of “coasting” followed by a braking interval. The analyses carried out aim to...
An algorithm of electrical machine phase current curve approximation was designed for motors powered by autonomous voltage inverter. The algorithm realization results in virtual model are presented. The algorithm is destined for mechatronic systems using informative properties of autonomous inverter.
This paper presents an efficient, reliable and cost-reduced intelligent drive system. It is based on using general purpose and affordable microcontrollers forming a network to control the inverter drives of three parallel operating 3-phase induction motor-pump systems. A cost analysis was performed to compare between the capital and operating costs of both conventional and proposed systems. The latter...
In this paper, design of permanent magnetic synchronous motor drive with sinusoidal excitation is pursued with the aim of technical reliability increase and implementation cost decrease. In this regard, the constraints in the way toward motor manufacture are mentioned. Then, steps are taken to cope with these issues by appropriate designing of controller and drive. Cost-effectiveness and ease of implementation...
Exhilarating advancements in power electronic technology have resulted in energy efficient methods in electric drives. This has paved the way for induction motors to be adopted for numerous industry applications replacing DC motors. Advantages of induction motors over DC motor like simpler construction, smaller motor size, lower maintenance, and better reliability them suitable for several applications...
This paper presents a comparative analysis of maximum torque per ampere control (MTPA) and zero d-axis current control (ZDAC) in Interior permanent magnet synchronous motor drive. Interior PMSM is preferred due its extra reluctance torque production. Zero d axis current control is used in most of the industrial application due its control simplicity. Due to thermal or reliability constraints the maximum...
This paper presents a two-degree-of-freedom (2-DOF) direct drive motor to achieve flexible motion control. As one of the motion control methods, robust position control is significant in order to functionalize industrial robots, machine tools, medical robots, and so on. Furthermore, these requires multi-degree-of freedom motion. Then the authors have proposed 2-DOF direct drive motor, which realizes...
This paper proposes a power conversion system for a treadmill with auto-transferring modes between a motor and a generator. With the grid-connection function, the kinetic energy of the treadmill can be converted into electric power and fed into the grid. An infrared sensor is equipped in the control loop to detect the position of the user on the treadmill. Based on the position of the user, the reaction...
A potentially efficient topology for electric vehicle powertrains consists of a two-level inverter with a DC-DC converter, operated with variable DC voltage control. Previous studies show that variable DC voltage control can lower the amount of motor torque ripple and increase the efficiency of a drive system as a whole. In literature, the target Modulation Index (MI) is assumed to be kept at a high...
This paper aims to implement an independent speed control for dual-PMSM drives fed by a single Five-Leg Inverter (FLI). In general, dual-motor drives are designed to reduce size and cost with respect to single motor drives. However, dual-motor drives using a single three-leg inverter has its limitation in the case of operation at different operating conditions and independent speed control requirement...
If it were possible to control four sets of permanent magnet synchronous motor (PMSMs) in place of induction motors by using one inverter, we would be able to manufacture efficiently running trains. Therefore, we previously proposed a method for controlling two or more sets of PMSMs with one inverter. For this study, we conducted a parameter survey on the load changes through simulation and a mini...
This paper discusses both dc-voltage balancing and ac-voltage minimizing of all the floating capacitors in a modular multilevel cascade inverter (MMCI-DSCC) intended for medium-voltage high-power synchronous-motor drives. It presents theoretical and numerical design considerations on both amplitude and phase of three-phase motor currents. A three-phase DSCC inverter with phase-shifted-carrier pulsewidth...
Permanent Magnet Synchronous Motor (PMSM) with lower inductance values suffering from the narrow Constant Power Speed Range (CPSR). The traditional approaches for extending CPSR operation included adding an additional inductance or a thyristor controlled inductance in series with the motor. However, these approaches increase the cost, complexity, and derate the inverter of the drive system. In this...
In an AC-DC-AC motor drive system, a beat phenomenon of the motor current occurs, especially in the over-modulation range with DC-link voltage ripple and low frequency carrier. We analyze this beat phenomenon and propose two beatless control methods. One modifies the carrier frequency in accordance with the motor speed within a narrow range, and as a result, the beat frequency can be shifted to a...
This paper analyses the theory of dead time in Direct Predictive Control, and then proposes a novel dead-time compensation method which can optimize the process of selecting the Voltage Vector by the cost function. The simulation results show that the THD of phase current is decreased and the waveform is improved after using the proposed method, which verifies the analysis and confirms the performance...
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