Out of total electrical motors 80% are three-phase squirrel-cage induction motors which are widely used in industrial and domestic applications because of the relatively low cost and high reliability. When oversized, most of these motors operate in low efficiency and poor power factor. Adjustable flux motors with multiple winding connections can be an energy efficient solution in variable and f...

In this paper we consider D-optimal and highly D-efficient chemical balance weighing designs. The errors are assumed to be equally non-negatively correlated and to have equal variances. Some necessary and sufficient conditions under which a design is D*-optimal design (regular D-optimal design) are proved. It is also shown that in many cases D*-optimal design does not exist. In many of those ca...

Cogging torque is the major limitation of axial flux permanent magnet motors. The reduction of cogging torque during the design process is highly desirable to enhance the overall performance of axial flux permanent magnet motors. This paper presents a double-layer magnet design technique for cogging torque reduction of axial flux permanent magnet motor. Initially, 250 W, 150 rpm axial flux brus...

This paper considers a moral hazard model with agent limited liability. Prior to interacting the principal, designs production technology, which is specification of his cost generating each output distribution. After observing principal offers payment scheme and then chooses distribution over outputs. We show that there an optimal design involving only binary distributions (i.e., any other proh...

An intense scholarly and public policy debate concerns the optimal design of political institutions for new democracies, particularly those facing deep ethnic or cultural cleavages. Drawing on a book-length study of political engineering in the AsiaPacific region, this paper surveys the differences between consociational and centripetal approaches to institutional design. After examining the ke...