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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...
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 a new current controller with modified decoupling and anti-windup schemes for a permanent magnet synchronous motor (PMSM) drive. In designing the controller, an improved voltage model, which is different from existing models in that it reflects all the nonlinear characteristics of the motor, is considered. In an actual PMSM, unintentional distortion occurs in inductance and flux...
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...
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...
For the widely-adopted inverter-fed drives, the stator winding insulation is more prone to various stresses compared to the line-start machines, i.e. the high rates of voltage change due to inverter switching (dv/dt), which will result in higher chances of insulation breakdown. To better illustrate the dynamic behaviors of the IPM machines under the stator turn fault, this paper presents a transient...
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...
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...
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,...
In this paper, a capacitive rotary encoder for contactless angle measurement is presented. The encoder includes a rotor and a stator. The rotor is composed by a coupling electrode and a sensitive electrode and the stator is mainly composed by an excitation electrode and four collection electrodes. A high frequency sinusoidal voltage is acted on stator's excitation electrode to offer a carry voltage...
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...
1Simple adaptations of the latest design ideas in [2] suggest the existence of a new observer to be used for sensorless speed control of (nonsalient-pole surface) permanent magnets synchronous machines. The rotor speed measurement-assumed to be measured in [2] by a low-resolution transducer providing a single pulse per revolution — is here replaced by the output of a PLL (Phase Locked Loop) block...
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,...
The paper presents a novel rotor design with U-shape flux barriers concept for a hybrid excited synchronous machine with flux magnetic bridges. Based on 3D finite element analysis the influence of axial flux bridges on the field-weakening characteristics of the machine is estimated and compared with experimental results. Moreover, harmonics spectrum of the air-gap flux density, no-load magnetic flux...
This paper proposes a sensorless self-commissioning technique for PM-assisted synchronous reluctance motors. The identification of the machine's flux maps is performed at standstill without any position transducer and with no need of rotor locking. The machine is first excited with alternated high voltage pulses, injected in the estimated d and q directions of the rotor to determine its saturation...
The magnetic bearing using the high temperature bulk superconductor (HTS) has been developed. In this system, the ring shaped permanent magnet is installed in the rotor. It has two poles. This configuration realizes increment of the linkage flux of the surface of the HTS on the stator. Pinning force of the HTS is used to support the rotor weight and keep the rotor stability. Pinning force depends...
Induction machines for traction applications are operated at working points of high ferromagnetic saturation. Depending on the working point, a broad spectrum of harmonic frequencies appears in the magnetic flux density of induction machines. Detailed loss analysis therefore requires local and temporal highly resolved nonlinear field computation. This loss analysis could be performed in the post processing...
Mechatronic modules with field regulated reluctance machine have improved mass-size parameters and can be used to drive the actuator valve of metallurgical production. The article shows the stages of synthesis of a mechatronic module elements': the selection of the parameters of the electric drive's power elements (the main dimensions of electromechanical converter), the control system (speed control...
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