ISCAD — Design, control and car integration of a 48 volt high performance drive

Abstract

Through its new technology the ISCAD system provides up to 300 kW with a safe-to-touch 48 Volt battery. This results in a high-performance drive that is intrinsically electrically safe. The novel machine design requires new concepts for power electronics, control systems, and integration strategies. Further degrees of freedom yield to challenges and even more important to possibilities for all kinds of applications. The innovation of the design will be explained and adjustments for power electronics and control will be worked out. The focus of this paper is the 3 rd generation of Intelligent Stator Cage Drive (ISCAD) prototypes. This first integrated and compact prototype has been used to re-equip a Geely Emgrand EV. The entire system and the mentioned process are described in detail. In addition, the in-house designed 48 V battery is highlighted. Simulations and measurements give an overall demonstration of the potential and the current status of the drive.

Enhancement of Sensorless Control for Non-Sinusoidal Multiphase Drives-Part I: Operation in Medium and High-Speed Range

“…In machines for traction, this double polarity gives a two-speed gearbox functionality, which is interesting when the flux-weakening controls are not satisfying, with only one polarity. This concept of multi-polarity with gearbox functionality can also be found in [41,42] in the ISCAD concept for low-voltage multiphase induction machines. This is mentioned in order to highlight the sensorless control when the principal amount of torque is not produced only by the fundamental (1st harmonic) of current and back EMF, as it is by the non-sinusoidal seven-phase PMSM studied above.…”

FEM-based Parameter Estimation for a Variable Phase-Pole Induction Machine

“…θ r = π. Ultimately, the complete inductance matrix L sr (θ r ) is given in (5). Because inductances are reciprocal, it holds that L sr (θ r ) = L rs T (θ r ).…”

“…The socalled intelligent stator cage drive (ISCAD) introduces a design in which the stator consists of aluminum conductor bars in each stator slot, short-circuited at one axial end. The resulting machine operates from a 48 V DC-bus and can be considered multiphase and multipole [5]. Nevertheless, a lower voltage implies higher currents on the stator side to reach the same power, approximately 15 kA in the presented case [6].…”

Pole-Transition Control of Variable-Pole Machines Using Harmonic-Plane Decomposition

“…Thereby, the machine functions as an electric gearbox, and the electrical operating point can be switched to minimize losses or maximize the torque per ampere in normal operation [12]. In [14], the necessity of an adapted current control for such machine types is emphasized.…”