This paper deals with the modeling and the control of a new high power 12V Integrated Starter Alternator (ISA). This system is used to bring micro-hybrid functions to standard Internal Combustion Engine (ICE) vehicles. The drive is composed of a seven-phase synchronous claw-pole machine with separate excitation, supplied with a seven-leg Voltage Source Inverter (VSI) designed for low voltage and high current. The system is modeled in a generalized Concordia frame and a graphical description is used to highlight energetic properties of such a complex system. A control scheme is then deduced from this graphical description. Two controls are achieved in generator mode and compared: one is using the VSI in a square-wave mode, the other in a Pulse Width Modulation (PWM) mode. Experimental results are provided.

The global supply of heavy rare earth magnets can become risky with the soaring demand of rare earth permanent magnet (PM) machines. One of the promising solutions is to reuse or recycle permanent magnets from end-of-Life electrical machines. This paper is an overview study of the state-of-the-art permanent magnet reuse and recycling research for electrical machines. Some methodologies for quantifying the recyclability of permanent magnet of electrical machines are also introduced.

This paper deals with the identification of a new high power starter-alternator system, using both: a Finite Element Method (FEM) modeling and an experimental vector control. The drive is composed of a synchronous 7-phase claw-pole machine supplied with a low voltage I high current Voltage Source Inverter (VSI). This structure needs specific approaches to plan its electrical and mechanical behaviors and to identify the parameters needed for control purpose. At f'U'st, a Finite Element Method (FEM) modeling of the machine is presented. It is used for the predetermination of the electromotive forces and of the torque. Experimental results are in good accordanee with numerical results. In a second part, resistive and inductive parameters of the drive are determined by an original experimental approach that takes into account each component of the drive: the battery, the VSI and the machine.

In the context of high power low-voltage and per leg is lower. So, it is possible to use only one or two applications as starter-generator for automotive, multi-phase power electronic devices per leg instead of a set of parallel drives present the attractive characteristic of reducing the connected devices [2]-[6]- [7]. The reliability is then higher current per phase and per leg. A 5-or 7-phase machine is also and the over-sizing unnecessary. more suitable for using concentrated windings, attractive for their short end-windings and subsequently for a higher Secondly the e multi-leg voffer anotherwayto expected torque-to-volume density. In this perspective, the 5-optimierthe useo DC-uslatageCmparedwitev3 and 7-leg Voltage Source Inverters (VSI) are compared with the phase nverter, a higher modulation idex m can be achieved 3-leg VSI. In the first part, for the same set of resistances and and the DC-bus current ripples are lower [8]. The 5-and 7-inductances coupled in different wye-coupling configurations, phase systems can make more profits of the voltage we examined the DC-bus currents and the power recovered by harmonics than the 3-phase ones: the torque can be increased the load for a square-wave VSI control: the 7-leg VSI is the by using the third and the other harmonics without the usual more efricient because it makes best use of the harmonics. In the drawbacks found for the three-phase machines such as torque second part, the torque ripples of 3-, 5-and 7-phase drives are ripples.compared: the 7-phase drive torque ripples are the lowest ones Multi-leg VSIs have been mainly studied in order to because of the less sensitivity to the harmonics of the currents.determine the switching times in the case of a PWM control In the last part, a Pulse Width Modulation control is studied, determme the moution inde is of a a 9t with almost the same voltage harmonics amount as this one [9]-[10]. In [11], the modulation index is studied for a 9-obtained with the square-wave mode control. Experimental phase system but only by injecting a ninth harmonic: by results are given for the 7-leg VSI either with a passive load or comparison with a 3-phase VSI with m = 0. 785 the increase with a 7-phase permanent magnet synchronous motor.of index is only of 1.5%. It appears that if the injection of a homopolar component in a 3-phase VSI has a great impact I. INTRODUCTION on the maximum modulation index (+15.5%), it is not the case with a 9-phase VSI (+ 1.5%). On the contrary, the In automotive industry, despite an increase of electrical injection of a third harmonic component has always an power, 42V system is not still a standard [1]- [2]. Economical impact. In [10], the effect of the third harmonic on the constraints make pressure to use as far as possible the modulation index is examined for a 5-phase VSI and a historical 14V system. It is the case for the StARS beltspecial Space Vector Pulse Width Modulation control: a driven starter generator developed by the automotive supplier maximum increase of 6.6% of the modulation inde...

-This paper presents the design and performance comparison of a conventional claw-pole machine with a permanent magnet based claw-pole machine for automotive application. The magnets are placed in the inter-claw region to decrease the leakage flux and to supply increased magnetic flux in the machine. It has been observed that with the addition of permanent magnets weighing only a few grams, there is a significant increment of more than 22% in output power of the machine. The geometric dimensions of magnets were also varied to verify their effects on performance and it has been observed that with the increase in magnet weight there is a non-linear increment in torque of the machine.