XIX Sympozjum Srodowiskowe PTZE - materialy.pdf

XIX Sympozjum PTZE, Worliny 2009
TRANSVERSE FLUX MOTOR COUPLED
WITH VOLTAGE-SOURCE INVERTER
Janez Leskovec 1 , Mykhaylo Zagirnyak 2 , Franci Lahajnar 1 , Damijan Miljavec 3,4
1 Kolektor, Idrija, Slovenija,
2 Kremenchuk State Polytechnic University , Kremenchuk, Ukraine,
3 University of Ljubljana, Faculty of electrical engineering, Trzaska 25, Ljubljana, Slovenia,
4 Corresponding author: Tel.: +386 1 4768 281; E-mail: miljavec@fe.uni-lj.si
Abstract. The aim of this paper is to present the optimization of outer rotor permanent magnet transverse flux
motor (TFM) using design of experiments. The magneto-static finite-element analysis (FEA) is used to calculate
cogging torque regarding variation of TFM geometric parameters. Further, in 3-D time-stepping finite-element
analysis the TFM model is coupled with a voltage-source inverter. The main objectives of TFM geometry
optimization are minimization of cogging torque, maximization of mean electromagnetic torque and
minimization of permanent-magnet's volume. All three optimization targets are realized in one TFM design.
1. Introduction
The development of soft magnetic composite materials increase the interest in
electromagnetic structures with 3-D guided magnetic flux, such as transverse flux motor
shown in Fig. 1 [1, 2, 3, 4]. Developed and here presented TFM is composed of inner stator
pressed from soft magnetic composite powder, outer non-magnetic rotor joke with permanent
magnets and flux concentrators. The three phase coils are in form of ring and positioned in
stator slots. The stator poles of each phase are shifted for 120 0 electrical degrees
circumferentially regarding each phase.
This paper deals with the use of design of experiment (DOE) methodology to optimize TFM
performance. Used methodology is belonging to robust design and is based on orthogonal
array recommended by Taguchi [5]. TFM performance calculations needs the 3-D FEM
analyze and it is time consuming, so the use of Taguchi DOE methodology is an optimal
choice. The main purposes of TFM geometry optimization are minimization of cogging
torque Tcogg, maximization of mean value of nominal electromagnetic torque Tmean and
minimization of permanent-magnet's volume. All three optimization goals must be achieved
in one TFM design. So, to take into account all desired optimization goals the use of 3-D
magneto-static and 3-D time-stepping finite-element analysis is needed [6].
103