Abstract
In this paper, a variable-mode concept is proposed for the speed range extension of a stator-consequent-pole memory machine (SCPMM). An integrated permanent magnet (PM) and electrically excited control scheme is utilized to simplify the flux-weakening control instead of relatively complicated continuous PM magnetization control. Due to the nature of memory machine, the magnetization state of low coercive force (LCF) magnets can be easily changed by applying either a positive or negative current pulse. Therefore, the number of PM poles may be changed to satisfy the specific performance requirement under different speed ranges, i.e. the machine with all PM poles can offer high torque output while that with half PM poles provides wide constant power range. In addition, the SCPMM with non-magnetized PMs can be considered as a dual-three phase electrically excited reluctance machine, which can be fed by an open-winding based dual inverters that provide direct current (DC) bias excitation to further extend the speed range. The effectiveness of the proposed variable-mode operation for extending its operating region and improving the system reliability is verified by both finite element analysis (FEA) and experiments.
Highlights
Due to the urgent issues on environment preservation and energy conservation, electric vehicles (EVs) have experienced a significant growth in recent years
It is worth noting that when all the permanent magnet (PM) are fully demagnetized, the stator-consequent-pole memory machine (SCPMM) is similar to a variable flux reluctance machine (VFRM).[5,6]
The purpose of this paper is to realize the coordinated control for SCPMM when it works with all PM poles, half PM poles and zero PM pole, respectively
Summary
Due to the urgent issues on environment preservation and energy conservation, electric vehicles (EVs) have experienced a significant growth in recent years. Numerous novel topologies of MMs have emerged, and a novel stator-consequent-pole memory machine (SCPMM)[3] was proposed to combine the advantages of simple rotor and easy manufacturability in doubly salient reluctance machine as well as excellent energy-efficient flux adjusting capability in MM. The “pole-changing” concept[4] is applied to SCPMM. In this way, parts of PMs can be fully demagnetized to implement the flux-weakening control. It is worth noting that when all the PMs are fully demagnetized, the SCPMM is similar to a variable flux reluctance machine (VFRM).[5,6] it is practical to further utilize a dual-three phase inverter to generate the zerosequence current to achieve the electrically excited operation. Stator outer diameter (mm) Stator inner diameter (mm) Air-gap length (mm) Active stack length (mm)
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