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This paper proposes the current reconstruction method in the single current-shunt inverter (SCSI) during the six-step modulation. Since the voltage vectors of the six-step operation are placed in the immeasurable areas of SCSI, the phase current cannot be reconstructed in the conventional researches. However, by changing the position of the sampling period, the current signal can be reconstructed...
The following work introduces the use of a nine-switch back-to-back topology, for its use with multiphase permanent magnet synchronous generator, based wind energy conversion systems (WECS). The converter topology consists of a nine-switch dual channel back-to-back three-phase voltage source converter capable of controlling two sets of three-phase variables without voltage limitations when operating...
This paper examines high speed performance of a permanent magnet (PM) machine with a reconfigurable winding (RW). First, the variations of machine parameters due to winding reconfiguration are presented and their impacts on drive system performance are investigated. To further understand system behavior, the reconfigurable ratio is set as a variable, and its effect on saliency ratio, flux weakening...
This paper presents design studies of an integrated electrical drive employing a wound field flux switching motor (WFFSM) coupled with a Z-source inverter (ZSI). The WFFSM has field excitation coils as dc field mmf sources locate at the stator body. On the other hand, the ZSI works as a three-phase inverter with voltage boost function by adding a switching device and an impedance-network. The impedance-network...
A reduced common mode voltage (CMV) based DC-link voltage balancing strategy is proposed for a neutral point clamped (NPC) three-level inverter with permanent magnet synchronous machine. Compared to the earlier proposed strategy, it completely eliminates the Vdc/2 corresponding CMV by eliminating the two zero voltage vectors (PPP, NNN) from the space vector switching sequences. Hence, it uses only...
A speed control scheme is proposed for a 3-phase induction motor that uses an open-ended stator winding fed by a dual inverter system with a floating bridge. The floating bridge has a voltage boosting function that extends the constant power high-speed range of the induction machine and operates the main inverter bridge at unity power factor. The proposed control scheme coordinates the two inverters...
In this paper, a comprehensive behavioral efficiency model of an electric motor drive system is proposed. The proposed model includes all possible motor drive losses without ignoring, approximating or assuming any of the inverter or machine losses, which are usually done for other efficiency models, hence the model is comprehensive. The input (DC electrical) and the output (mechanical) power of the...
This paper proposes the novel control method for mono inverter dual parallel (MIDP) interior permanent magnet synchronous machine (IPMSMs) drive system. It includes maximum torque per ampere (MTPA) control method to elevate drive efficiency and active damping control method to alleviate inherent stability problem of MIDP motor drive system. Due to the combination of reluctance and electromagnetic...
This paper proposes a new interior permanent magnet machine (IPMM) drive system with low cost and simple configuration. The proposed system consists of a two-phase IPMM, a single-phase H-bridge inverter, and dc link. Between two-phase stator windings, a main winding is supplied by the H-bridge inverter for adjustable speed drives while an auxiliary winding is short-circuited. This structure makes...
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 discusses various transient trajectories for increasing the magnetization state (MS) of variable flux permanent magnet synchronous machines (VF-PMSMs), a class of PMSM where the magnets are demagnetized and remagnetized using the drive inverter during drive cycle operation. To manipulate MS, a magnetizing current pulse can be used, which may drive a large amount of flux linkage in the machine...
This paper examines the performance benefits of four IPM drive system configurations for HEV/EV applications with the following features for controlling the machine voltage: 1) boosted inverter, 2) Y/Δ, 3) series/parallel (S/P) and 4) tapped reconfigurable windings. The four systems are modeled and their impact on drive system performance is investigated. Additionally, comparisons in terms of flux...
Analytical design and adaptation of voltage regulation loop for flux-weakening control of Interior Permanent Magnet Synchronous Motor drives are addressed in this paper. Theoretical analysis of the overall dynamics of the loop has been carried out in recent papers, also taking into account non-linear effects and discrete-time implementation issues. A proper gain adaptation technique was proposed to...
This research proposes a novel low-voltage inverter-fed motor drive with variable characteristics achieved through the individual winding current control for the automobile traction motor. The independent armature winding with low-voltage inverters can improve the total efficiency by reducing the converter losses. Furthermore, the motor can expand the operating range since the inverters are able to...
This paper studies the modeling, switching strategy and control scheme for NPC three-level (NPC-3L) inverter fed dual-three-phase permanent magnet synchronous motor (PMSM) drives. Firstly, the dynamic modeling of the system is described and analyzed. Then, the space vector modulation (SVM) strategy is designed for the drive system under double d-q frames. Not only the harmonic performance but also...
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