Candidates of motor drives for 48V automotive applications

Abstract-In automotive systems, reliability and cost are paramount for the success of electrical drive systems. Considering the interior permanent magnet motor, the cost of the rareearth permanent magnet is becoming a big concern. In this paper, the switched reluctance motor, variable flux reluctance motor and synchronous reluctance motor are analyzed and compared as candidates for the 48V automotive applications. A recommendation is given for the selection of the motor drives

High-speed slotless permanent magnet machines:modelling and design frameworks

\u3cp\u3eThis paper presents a design framework for high-speed slotless permanent magnet machines based on extended harmonic modeling (HM) technique to predict various electromagnetic properties and torque distribution. The developed models for generic design framework are able to evaluate slotless PM machines' topologies with a wide range of 3D slotless windings, (including those with skewing), and can be also used for future design optimization routines.\u3c/p\u3

Surge control of the electrically driven centrifugal compressor

This paper presents a method of the energy efficiency and the operational performance improvement of the electrically driven air compression system. The key innovation of the proposed method-the active surge suppression of the centrifugal compressor by means of the speed control of the electrical drive has been experimentally validated. This method allows the load following operation of the compression system keeping the fast response on the application demands. The described control approach is considered to be applied to the Balance-of-Plant of a fuel-cell power syste

Usage of the inductive energy storage in the field winding for driving the variable reluctance motor

\u3cp\u3eIn automotive systems, reliability and cost are paramount for the success of electrical drive systems. Considering the switched reluctance motor (SRM), the power electronics cost dominates the total cost of the electrical drive. In this respect, especially the dc-link capacitor significantly contributes to the total bill of the material. This paper proposes the use of a dc-excited winding in an 8/6 SRM as a means of reducing the capacitor. The energy conversion of the motor is analyzed intensively. The control algorithm of the field winding is investigated and an active control algorithm is proposed to provide and absorb the energy in parallel with the dc-link capacitor. The effectiveness of this control method is confirmed by the cosimulation between the finite-element method and the Simulink.\u3c/p\u3

Field weakening capability of 12-stator/10-rotor-pole variable flux reluctance machines

Variable flux reluctance machines (VFRMs) are viable candidates for automotive applications. This paper investigates the field weakening capability of a 12/10 VFRM. Starting with voltage and toque equations, the paper reveals the relationship between torque-speed characteristics and the current arrangement (slot division) of both DC-field and armature windings. The method for expanding the working envelope by tuning DC or AC currents is discussed for different slot divisions. The results are validated by 2D finite element analysis

Torque ripple minimization of variable flux reluctance machines by rotor skewing

Variable flux reluctance machines (VFRM) are an interesting candidate to substitute permanent-magnet synchronous machines in many applications, mainly owing to the absence of rare-earth permanent magnets and improved field weakening capability

Force and torque calculation methods for airgap windings in permanent magnet machines

Methods for force and torque calculations in permanent magnet (PM) machines with airgap windings are studied. Both analytical and numerical methods are applied to calculate the Lorentz force. The presented methods are applicable to various winding types and allow evaluating the geometry quickly. For a comparison of the methods a rhombic winding has been selected as a test case

Design and optimization tools for high-efficiency three-phase induction motors

An Expert System (ES) for the analysis and design optimization of low-power, three-phase induction motors (IMs) is presented. The ES is based on analytical models, which are carefully selected from literature, and coupled together to calculate motor performance characteristics. These performance characteristics are computed within a few seconds. Also, validation of the ES calculation results against measurements on four test motors shows that the analysis results are reasonably accurate. Additionally, the ES is applied to redesign a case study motor and a prototype of the new design is realized. The theoretical design results are validated against measurement performed on the prototype. This validation shows that the design optimization works, though a more accurate description of the lamination material B(H) characteristic is desirable to improve the accuracy of the ES

Inductance calculation of high-speed slotless permanent magnet machines

Purpose – The purpose of this paper is to give a simple, fast and universal inductance calculation approach of slotless-winding machines and comparison of inductances of toroidal, concentrated and helical-winding machines, since these winding types are widely used among low-power PM machines. Design/methodology/approach – Harmonic modeling approach is applied to model the magnetic field of the windings in order to calculate the synchronous inductances. The method is based on distinction between electromagnetic properties of different regions in the machine where each region is represented by its own governing equation describing the magnetic field. The governing equations are obtained from Maxwell’s equations by introducing vector potential in order to simplify the calculations. Findings – Results of the inductances of toroidal, concentrated and helical-winding slotless PM machines, which have the same torque and dimensions, obtained by the proposed analytical method are in good agreement with 3D FEM, where the relative difference is smaller than 15 percent. However, the calculation time of the analytical method is significantly less than in 3D FEM: seconds vs hours. Additionally, from the results it is concluded that the toroidal-winding machine has the highest inductance and DC resistance values among considered machines. Helical-winding machine has lowest inductance and DC resistance values. Inductance of concentrated-winding machine is between inductance of helical and toroidal windings; however, DC resistance of the concentrated windings is comparable with resistance toroidal windings. Originality/value – In this paper the inductance calculation based on harmonic modeling approach is extended for toroidal and helical-winding machines which makes the method applicable for most of the slotless machine types