Liiketoimintaprosessien mallinnuksen edellytykset suuressa tehdasyksikössä

In the theoretical part of this master’s thesis business process management and process modeling and the benefits and challenges related are discussed. The empirical part consists of two parts. The first one is a case study about process management and modeling and the second one presents the outcomes from a modeling project that was executed for the employer of this thesis. In the project the target mill unit’s business processes were identified, a process map was conducted and process architecture for further use was established. In the outcomes of the study challenges and possibilities of process management and modeling as well as possible reasons for these prejudices are discussed based on the case study and the modeling project. From the research of this thesis a framework for successful process modeling is established. The framework highlights four most important sectors that an organization should evaluate before and during the modeling project.

Evaluation of the Efficiency of Line-Start Permanent-Magnet Machines as a Function of the Operating Temperature

The standard squirrel-cage induction machine has nearly reached its maximum efficiency. In order to further increase the energy efficiency of electrical machines, the use of permanent magnets in combination with the robust design and the line start capability of the induction machine is extensively investigated. Many experimental designs have been suggested in literature, but recently, these line-start permanent-magnet machines (LSPMMs) have become off-the-shelf products available in a power range up to 7.5 kW. The permanent magnet flux density is a function of the operating temperature. Consequently, the temperature will affect almost every electrical quantity of the machine, including current, torque, and efficiency. In this paper, the efficiency of an off-the-shelf 4-kW three-phase LSPMM is evaluated as a function of the temperature by both finite-element modeling and by practical measurements. In order to obtain stator, rotor, and permanent magnet temperatures, lumped thermal modeling is used.