Howard C. Lovatt

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A PEC is a Pattern Enforcing Compiler, which is like a conventional compiler only extended to include the extra checks needed to enforce design patterns. PECs are currently a research project and the PEC written is targeted at the Java programming language. This paper: ƒ Describes the PEC ƒ Describes how to use the PEC ƒ Demonstrates how the PEC combines(More)
The introduction of rare-earth permanent magnets based on samarium-cobalt in about 1970, and neodymium-iron-boron magnets in the mid-nineteen eighties, has ushered in a new era in hard magnetic materials. This has resulted in a dramatic improvement in permanent magnet performance, with neodymium-iron-boron (Nd 2 Fe 14 B) magnets having a magnetic energy(More)
The rugged low-cost construction and constant power profile of a switched reluctance motor (SRM) make it suitable for hybrid electric vehicles (HEVs). This paper describes the development of a voltage-based control strategy for a SRM. The controller design is influenced by project constraints and goals as well as the use of a new power topology. A prototype(More)
Hybrid electric vehicles (HEVs) powered by electric machines and an internal combustion engine (ICE) are a promising means of reducing emissions and fuel consumption without compromising vehicle functionality and driving performance. Reducing emissions is important because pollution in cities is almost entirely due to transport and is linked to the illness(More)
1. Towards sustainable road transportation Worldwide , major automotive manufacturers are showing considerable interest in the development of hybrid electric vehicles (HEVs). These vehicles may be heat-engine−battery hybrids, or all-electric designs with a fuel cell to provide range and a high-power battery to boost acceleration. To date, the Toyota Prius(More)
The switched reluctance motor (SRM) is a low cost motor option. However it has lower power factor than competing motors and this has led to the incorrect perception that the power electronics are expensive. This paper shows that using the inverse of power factor as a proxy for converter rating and hence cost is incorrect; in particular device utilization(More)
This paper describes a coniputer program which models in detail singly-salient and doubly-salient. open-loop and closed-loop. reluctance motor drives. The program is integrated into a larger suite of general modelling and design programs. Saturation. load-dynamics and the limitations of transducers are all included In the program. Validity of the program is(More)
Traditionally iron loss in motor stators is measured using loss separation, where overall loss is measured and then other losses like windage, bearings, copper, and rotor losses subtracted. This technique is unsatisfactory because the stator iron loss is typically smaller than the other losses subtracted and therefore a small error percentage wise in one of(More)
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