1,721,013 research outputs found
Analytic Modeling of Inverter-Fed Induction Machines-A Practical Approach for Matching Measurement and Simulation Data
No full textElectrical engineers rely on analytical models to design industrial induction motors for different customer-driven applications. These models are fundamental and do not normally consider additional core losses due to stamping or welding or the impact of being inverter fed. To overcome the resulting gap between analytical results and measured data, these equivalent circuit models are traditionally adapted by correction factors. This paper presents a methodology allowing the parameterization of such an analytical model based on inverter-fed load and no-load measurements carried out for several frequencies. The results show a fair agreement over a wide range of operating points, which is acceptable for daily regular industrial applications
Finite Elements Model Co-Simulation of an Induction Motor Drive for Traction Application
No full textThis paper presents the results obtained by the finite elements model co-simulation technique in the transient analysis of an electric drive for advanced traction applications. The case study refers to a 200kW induction motor drive designed for a premium electric vehicle in the frame of the Horizon 2020 “ReFreeDrive” project (Rare earth Free e-Drives featuring low cost manufacturing). The transient performance and the operating limits are evaluated when a field-oriented control strategy based on the lumped parameters model of the machine is used. The co-simulation involves the ANSYS/Simplorer and MATLAB/Simulink environments. The finite element motor model developed in ANSYS is controlled by the rotor flux-oriented controller with axes decoupling built in Simulink. A lumped parameters motor model is also derived to design the control parameters and implemented in Simulink for comparison respect to the co-simulation approach. The results highlight the influence of the controller detuning for the correct prediction of the voltage limit operation at steady state
Performance Evaluation of an Induction Motor Drive for Traction Application
No full textThis paper concerns the design of an induction motor drive for traction application in the framework of the EU H2020 “Smart, Green and Integrated Transport” challenge. The target vehicle reflects the specification of a high-class electric vehicle, and it led to design a traction induction motor capable to provide 200 kW in the range from 6000 to 20000 rpm. The paper focuses on the performance evaluation of the motor design accounting for the drive control strategy. Design features and data are provided. Maximum performance both in the constant torque and the flux weakening zones are outlined by finite element method steady-state analyses, providing the thermal and supply limits. Then, the drive control is taken into account by dynamic simulations. The performance are evaluated over the whole torque-speed region considering the actual control strategy and driving modes of modern smart vehicles. Operating examples are provided
Cage Losses in Induction Motors Considering Harmonics: A New Finite Element Procedure and Comparison With the Time-Domain Approach
No full textThe cage losses in induction machines due to spatial or time harmonics in the air-gap field are a crucial parameter for a precise estimation of the machine efficiency. Using finite element, the common approach to consider the overall cage losses, by performing complete time-domain analyses. Alternatively, a rough estimation is achieved introducing equivalent parameters in the circuital model. In this article, a methodology for cage losses computation due to air-gap spatial field harmonics is described. The proposed finite element procedure is faster than the time-domain analysis since it is based on magneto-static and linear time-harmonic simulations to carefully consider the iron saturation and compute the induced currents in a specific working point. In the article, a detailed procedure description and comparison with respect to the time-domain approach is reported
Electromagnetic performance with and without considering the impact of rotation on convective cooling
Get PDFStator Winding Thermal Conductivity Evaluation: an Industrial Production Assessment
No full textThe thermal conductivity between winding and lamination is one of the most critical parameters in electrical machine thermal analysis. Its value depends on the insulation material and on the manufacturing process of the winding system and for this reason cannot be computed using analytical equations. In this paper a practical investigation of equivalent thermal conductivity of electrical machines stator winding is presented and discussed. The fully experimental approach is based on a fast transient thermal test to evaluate the winding equivalent thermal conductivity. The test campaign is carried out on two sets of Total Enclosed Fan Cooled ‘TEFC' industrial induction motors produced by two different manufacturers; the rated power of the devices under test ranges from 1.5 kW up to 55 kW
Modern Heat Extraction Systems for Power Traction Machines - A Review
No full textThis paper presents a review of modern cooling system employed for the thermal management of power traction machines. Various solutions for heat extractions are described: high thermal conductivity insulation materials, spray cooling, high thermal conductivity fluids, combined liquid and air forced convection, and loss mitigation techniques. Index Terms—AC losses, cooling system, conduction, convection, core losses, high thermal conductivity, magnet losses, radiation, spray cooling, thermal analysis, thermal management
- …
