IPM Machine Drive Design and Tests for an Integrated Starter–Alternator Application
ABSTRACT This paper deals with an integrated starter-alternator (ISA) drive which exhibits a high torque for the engine start, a wide constant-power speed range for the engine speedup, and a high-speed generator mode operation for electric energy generation. Peculiarities of this ISA drive are thus its flux-weakening capability and the possibility to large torque overload at low speed. The focus on the design, analysis, and test of an interior permanent-magnet motor and drive for a prototype of ISA is given in this paper. In details, this paper reports on the design of stator and rotor geometries, the results of finite-element computations, the description of control system, and the experimental results of prototype tests.
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ABSTRACT: Low weight and volume are the principal requirements for electric components in hybrid motorcycles, and the energy storage system (ESS) is the most important part that contributes to this issues. This paper deals with the choice of the best ESS and with the optimization of the hybrid power train in two-wheeled vehicles. A methodology of investigation is given in order to recognize all the data necessary to find the best technology and size for the ESS. The techniques adopted for the design of the electrical machine (EM) are also reported. Furthermore, simulations with finite elements (FE) and mathematical software, in order to predict the EM and the drive performances, are presented. Efficiency maps from FE simulations are also given. Different kind of ESSs are compared with the goal to choose the best solution balancing cost, volume and weight for a reference motorcycle. The whole power train has been practically realized and the new hybrid vehicle has been tested first in appositely test bench and also in a small private racetrack. The measured experimental results are presented.Electric Machines & Drives Conference (IEMDC), 2013 IEEE International; 01/2013
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ABSTRACT: We investigated the torque characteristics and the motor efficiency of interior permanent magnet synchronous motors (IPMSM), in which a rotor core consists of high-strength nonoriented electrical steel, as-cold-rolled nonoriented electrical steel, and conventional nonoriented electrical steel with various bridge widths. Furthermore, we analyzed deformation behavior of the rotor core during operation by finite element method. The motor of the high-strength nonoriented electrical steel generated greater magnet torque than that of the conventional nonoriented electrical steel. Although the high-strength nonoriented electrical steel had much higher iron loss than the conventional nonoriented electrical steel, the motor efficiency decreased only slightly. A reduction in the bridge width of the rotor core significantly enhanced the torque characteristics and the motor efficiency of IPMSM. The high-strength nonoriented electrical steel effectively suppressed the deformation of the rotor core with its excellent mechanical properties, and the suppression enabled us to reduce the bridge width sufficiently. Accordingly, a magnetically optimum rotor core design will be realized with the high-strength nonoriented electrical steel, and the performance of IPMSM will be significantly enhanced, particularly in traction motors for electric vehicles and hybrid electric vehicles and compressor motors for energy-efficient air conditioners.IEEE Transactions on Magnetics 06/2013; 49(6):2997-3001. · 1.42 Impact Factor
Conference Paper: Machine selection and initial design of an aerospace starter/generator[Show abstract] [Hide abstract]
ABSTRACT: A starter/generator combines the electrical starting and generating functions, necessary for combustion engines, into one machine. This requires both low-speed high-torque and highspeed constant-power operation, which are conflicting requirements. Aerospace gas-turbines require starting times in the order of 10-30 s and to avoid overheating, the starting performance of the electrical machine becomes as important as the generator performance. In addition, safety requirements dictate a failsafe machine. In the case of PM machine this requires a high inductance to limit fault current, further constraining the design. This paper qualitatively compares various machines types for use as a S/G and then selects and optimizes a number of PM machines, highlighting the trade-offs to be made between the different operating modes and how this affects the weight of the machine.IEEE International Electric Machines & Drives Conference (IEMDC); 05/2013