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The influences of current amplitudes on four-phase 24/18-pole doubly salient electro-magnetic motor(DSEM) under fault-tolerant operation are studied in this paper. Taking average output torque, output torque ripple and stator copper losses into consideration, the optimal fault-tolerant current amplitude (FTCA) range is obtained. A four-phase full-bridge converter with two bilateral switches is applied...
Dual three-phase machines are attractive due to advantages such as inherent fault tolerance. During postfault situation, the same magneto-motive force as in healthy operation should be maintained. Furthermore, it is also important to minimize the copper losses. Several strategies have been proposed to improve the postfault performance under open-phase fault. The maximum-torque (MT) strategy obtains...
This research examines the vibration and thermal characteristics of double-sided flux concentrating Transverse Flux Machines (TFM), designed for direct drive application. Two TFM prototypes with different stator cores, one with Quasi U-Core and the other with E-Core, has been used for the study. 3D Finite Element Analysis (FEA) has been carried out to determine the no-load and with load performance...
Axial Flux Permanent Magnet (AFPM) motors of two types, coreless and conventional topologies, have been studied in order to identify their merits and drawbacks at different ratings, particularly for in-wheel electric transportation applications. The performance of the coreless with several slotpole combinations and number of disks is evaluated. Design of experiments (DOE) methodology is utilized to...
Common-mode voltage (CMV) by switching pattern of space vector pulse width modulation (SVPWM) excites parasitic capacitance coupling in interior permanent magnet synchronous motor (IPMSM), and it finally causes shaft voltage. Among all parasitic capacitances, winding-to-rotor parasitic capacitance has the greatest effect on the shaft-to-frame voltage. In the study, mitigation method of a shaft-to-frame...
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...
For evaluate the thermal behavior of a permanent magnet motor under different types of losses and various loss distributions, a simplified thermal circuit is proposed. The result shows that, the model presented in the companion paper is suitable to use in machine design with certain accuracy.
Surface permanent magnet vernier (SPMV) motors are gaining more and more attentions over recent years due to their high torque density. Generally, most researches focuses on their applications in low speed, high torque area, and the study on their high speed operation is rarely seen. In this paper, a SPMV motor with 12 slot, 20 rotor pole is evaluated for traction application. The optimal designed...
This paper investigates the effect of AC losses on the steady-state temperature rise distribution in concentrated windings of permanent magnet machines with parallel strands by combined electromagnetic and thermal finite-element analyses. The copper losses are decomposed into DC loss, strand-level AC loss and bundle-level AC loss. It shows that the AC losses can significantly increase the winding...
Induction motor is the most popular load in the transportation systems like Hybrid vehicle, Traction and Propeller. Now-a-days most of the researches are done on hybrid vehicle. It is very important to study about the cost effective, efficiency and quality on induction motor performance. For easy transportation purpose the weight of the motor is low and similarly for the performance of the motor the...
Asphalt stator bar insulation was first used in about 1915 and quickly became universal in the industry for large generators until about 1950. Numerous tape migration (“girth crack”) problems occurred beginning in about 1950 on large units, >40 MW. The problems were so great that the industry generally abandoned asphalt in favor of thermoset resins, e.g., Thermalastic, Micapal, Micadur. But asphalt...
This paper proposes a new variable field wind generator with soft magnetic composite material and the basic theories were presented. Basically, the overlapping of the two magnetic fields is applied to its machine operation. The fundamental theory of the new wind generator is the same as traditional generators. Its bias of magnetic fields and two stator partitions increase iron and copper losses. Soft...
With increased demand in electric drives applications for higher power density, higher efficiency and higher temperature operation, integrated motor drives are gaining greater interest in automotive, aerospace and other specialist applications. Integrated drives not only physically integrate the various components of the drive (power electronic devices, filter components etc.) they must also integrate...
As the common-mode voltage generated by the pulse width modulated inverter excites the parasitic capacitance coupling between the winding, stator, rotor, and bearing, shaft voltage occurs between the shaft and the grounded motor frame. Thus, this study proposes the shaft voltage suppression approach by applying a cylindrical copper shield surrounding the shaft in an interior permanent magnet synchronous...
The switched reluctance technology offers some distinct advantages compared to conventional electric machines, such as simple and cheap construction, robust design, fault tolerant operation and high-speed capabilities. In the last couple of decades, improvements to the conventional SRM have been suggested, though each suggestion is subject to its own weaknesses. This paper presents a novel double...
This paper deals with the results of an experimental induction machine with a new magnetic structure applied on die casting copper rotor, which is based on a non segmented lamination with grain oriented electrical steel sheets in order to reduce core losses and increase the interbar resistance thanks to the glass film. The same stator is used in order to change only the rotors.
Due to the advantages of high efficiency and high torque density, the Permanent Magnet Synchronous Machine (PMSM) has been widely used in direct-drive applications such as all-electric propulsion system. The loss and efficiency of PMSM are the main restriction for performance improvement. This paper focuses on analyzing the influence of structure parameters on the loss and efficiency of PMSM, including...
Discrete sub-system due to passive elements in motor drive require functional and structural integration to make efficient and power dense overall system. Such power dense system is the prerequisite in aerospace and marine applications. This paper presents the design optimization of integrated rotor-less inductors for high speed AC drive applications. Different slot-pole combinations are considered...
Grid compliance is a crucial feature for modern wind turbine systems in power generation. The generator is one of the key components in a WTS. However, in order to predict the response of a directly grid connected wind generator to grid code requirements, an optimisation-based design over a large design space is needed. In this research, an analytical design model is developed for a grid compliant...
Cast copper rotor is a new type of rotor which uses the excellent electrical conductivity of copper to reduce the rotor loss and improve the efficiency of motor, and this paper focuses on the structure design method of frequency conversion motor with cast copper rotor. Based on the particularity of frequency conversion motor with cast copper rotor, this paper analyzes the effect rules of stator slot...
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