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Design of switched reluctance motor (SRM) with emphases on torque ripple suppression and current reduction is researched in this paper. The motor is operated with direct torque control (DTC) to obtain a good torque control performance. Since motor design and motor control are two important aspects of the motor drive system, to achieve a better performance of the whole system, they should not be treated...
Energy consumption and efficiency of electrical drives became an increasingly important issue. This issue encourages many researchers to develop new control techniques to reduce the energy consumption in electrical drives. Some of those techniques are more effective than others; some of them could save energy but will affect the response of the drive. DB-DTFC control has the fastest possible response,...
This paper presents a new study on the comparison of dual-rotor single-stator (DRSS) and dual-stator single-rotor (DSSR) axial flux-switching permanent magnet (AxFSPM) machines. The DRSS and DSSR AxFSPM machines have the same dimensions except for stator and rotor yoke lengths. 3-D finite element analysis (FEA) and experimental verification are used for the comparison study. The comparison results...
For automotive applications, accurate torque production capability and high efficiency of the traction motor is very important. However, the performance of widely used interior permanent magnet (IPM) machine is influenced by temperature variation. In this paper, a control algorithm is proposed to compensate the performance variations in IPM machines due to temperature change utilizing current pulse...
This paper proposes an approach to estimate the ratio between shorted and total turns in interior permanent magnet synchronous machines (IPMSM). When an inter-turn short circuit (ISC) occurs, a particular disturbance affects the motor. The proposed method estimates this disturbance using an observer; this estimated signal is used to obtain the short circuit ratio. The observers are based on a dynamic...
Classical induction machine design generally focuses on achieving high steady state efficiency. In contrast, automotive applications consist of almost continuous transients, where the flux linkage is varied along the driving cycle to save energy. With conventional induction machines designed for high steady state efficiency, higher peak current and excessive machine losses can occur during the transient...
Vernier permanent magnet synchronous machine (VPMSM) is a promising candidate for low speed direct-drive applications. At the design stage of VPMSMs, one of the key issues is the selection of the slot/pole number combination. This paper will show that a proper selection of the slot/pole number combination can be achieved based on an index parameter of VPMSMs: the gear ratio. Firstly, the magnetic...
This paper proposes an enhanced approach to estimate the stator winding temperature based on active DC flux injection for induction machines with two representative direct torque control (DTC) schemes, the conventional hysteresis-based DTC and the deadbeat DTC. In this method, the stator resistance is regarded as the indicator of its temperature, and is estimated by applying offsets to the flux controllers...
This paper investigates a novel two-converters based operation of a Brushless Doubly Fed Reluctance Machine (BDFRM). The BDFRM has a ducted rotor, and the stator is wound with two distributed windings which are fed from two separate power converters. Operation theory with frequency sharing between the two windings is introduced and corresponding FEA simulations are analyzed. The proposed BDFRM design...
Hybrid excited flux-switching machine (HEFS) is a novel brushless synchronous motor. Compared to conventional permanent magnet synchronous machine (PMSM) and permanent magnet flux switching (PMFS) machine, it has additional excitation winding in its stator to modulate the air-gap magnet field. In this paper, the topology and operating principle of HEFS is analyzed. Its dynamic mathematical models...
This paper proposes a method based on signal injection to obtain the saturated current-flux relations of a PMSM from locked-rotor experiments. With respect to the classical method based on time integration, it has the main advantage of being completely independent of the stator resistance; moreover, it is less sensitive to voltage biases due to the power inverter, as the injected signal may be fairly...
The well-known maximum torque per ampere (MTPA) strategy is usually integrated the field oriented control (FOC) to improve the efficiency of interior permanent-magnet (IPM) synchronous motor drives. As an alternative to the FOC, direct torque control (DTC) has attracted extensive attention from both academia and industry in the last few decades, due to its distinctive advantages, e.g., fast dynamic...
High torque density at low speed is one of the main characteristics of applications such as wind turbines and traction systems. Permanent magnet transverse flux machines exhibit this features owing to their high-energy magnetic flux, which is normal to current and motion vector. The machine's specific geometry magnifies cogging torque that further increases torque ripple, noise, and mechanical vibrations...
This paper deals with the sensorless direct torque control (DTC) scheme for the permanent magnet synchronous motor (PMSM), where a new estimation algorithm is developed based on the polynomial chaos theory and the extended Kalman filter (EKF) for the sensorless obtaining of the rotor speed, stator flux and electromagnetic torque. The proposed estimator can effectively deal with parametric uncertainties...
Current control of IPMSM servo system is investigated in this paper. Under the field-weakening control framework, nonlinear couplings of the voltage equations are very strong. The current control performance may not be well until such nonlinear couplings are well dealed. In this case, a DOB-based model predictive control is proposed to improve the current control performance under field-weakening...
This paper deals with the improvement of autonomous underwater robot propulsion systems. These need upgrades to enhance robots capabilities demanded by complex tasks, such as marine current turbine maintenance. We propose a Radial design for the concept of Reconfigurable Magnetic Coupling Thruster (R-RMCT). This design is based on the usage of a radial magnetic coupling as the core of a magnetic joint...
This paper deals with the derivation of commutation angles for maximum torque for switched reluctance motors operated over their entire speed range. A linearised model of the motor was used for this purpose, and the definition of the rated speed was derived. It is shown that the switched reluctance motor provides constant power in the field-weakening mode in case of continuous current operation. Then,...
Due to the consideration of the atmospheric pollution, electric vehicles (EV) have become more and more popular. The permanent magnet synchronous motors (PMSM) have been widely used in EV because of its high efficiency, high torque density and ability of fault-tolerant operation. In this paper, firstly, a six-phase PMSM mathematical model was built using space vector decoupling theory. Based on this,...
On Multiple-Motor systems fed by Multiple-Converter systems a set of electric motor drives share the load through a common mechanical coupling. Such a coupling is exploited in this paper to realize a sensorless field oriented control, based on a quite common back-emf technique to estimate the rotor flux angular position and an original approach to correct the estimation errors. The technique is based...
Electrically Excited Synchronous Motor (EESM) serves as an option on hybrid vehicle applications. An EESM for mild hybrid application is designed in this study. Copper loss minimization and field current minimization are analyzed for current control strategies of EESM. Both of the current control strategies are applied and comparisons between the two are made thereafter. In both of the strategies,...
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