Date: October 16th, 2018


09:00 - 9:30 Welcome Coffee and Registration

9:30 - 10:00

Powersys Introduction

10:00 - 10:30

Development planning of JMAGTakashi Yamada, Jsol Corporation.

JMAG is constantly being worked on to achieve highly accurate and high-speed simulation. JSOL would like to share our progress from the past year including parallel solvers to accelerate speed as well as GUI improvements aiming for increased productivity of analysis workflow. Analysis technologies we are currently focusing on and our plans for incorporation will also be covered in this presentation. Design exploration is an important topic this year. This presentation will discuss the present and future of JMAG.

10:30 - 11:00

Coffee break

11:00 - 11:30

Identifying and solving demagnetization problems in an IPM compressor motor using JMAGJames Nicholls, Technelec.

This presentation will describe the use of JMAG to assess the demagnetisation risk of a 10 pole permanent magnet motor. JMAG was used with a new post processing analysis to predict the performance of rare earth magnets at a range of currents and to characterise different designs in terms of their risk of demagnetisation.  The 10 pole motor design did not offer sufficient operating margin against demagnetisation.
Using the new analysis, a new design with a different pole number was selected that has a much lower demagnetisation risk, and its performance was compared with the original design.  Additional demagnetisation analysis was performed using 3D analysis in JMAG to ensure there is a low risk at the ends of the machine.
Test results from a prototype of the new design are compared with simulation.

11:30 - 12:00

Electromagnetic Analysis of a high speed Induction Motor in an EV application using JMAG, Milind Paradkar, AVL.

The design of a high-speed induction motor poses several challenges as it to has consider electromagnetic, thermal, mechanical and acoustic effects. Theoretically, several combinations of stator slot and rotor bar numbers are possible for selection. Electromagnetic analysis of a high speed induction motor is detailed here and the influence of slot-bar combination on the motor performance is analyzed using JMAG.

12:00 - 13:30

Buffet lunch

13:30 - 14:00

Halbach Arrays for In-Wheel traction motors using JMAG, Iago Martinez, Newcastle University.

Comparison of Halbach array against surface mounted permanent magnet arrangement for in-wheel traction motor. It will be consider demagnetisation, physical-airgap and torque capability at continuous and overload operation. It will cover one and three transition Halbach arrays as well as introducing a novel trapezoidal Halbach array to reduce demagnetisation.

14:00 - 14:30

Influence of the proximity effect on ac losses in the end-winding region of high power density traction motors, David Philipp Morisco, Robert Bosch GmbH

The main requirements for a rotating electric machine for traction applications are the torque/power density and the energy efficiency. Nowadays, an impressive effort is done to precisely calculate the influence of parasitic effects on the ac losses. With increasing availability of high performance computing (HPC) and the acute interest for precise loss calculations [1], the simple empirical approaches [2] to estimate additional losses may have come to their limits. Especially in the field of losses in the end-winding region of high power density electrical machines this tendency has been further aggravated by changing the winding technology from pull-in winding to bar wound winding [3]. Therefore, in this paper the end-winding stray field is analyzed and the additional ac losses in the end-windings are presented and assessed. Furthermore a reduced order modelling approach is introduced to increase the speed of analysis. The approach is illustrated on a 100kW traction motor machine where the influence of the additional losses is depicted for the full efficiency map calculation.

14:30 - 15:00

An Approach to Axial Flux PM Machine Design with Soft Magnetic Composite Materials, Steven Jordan, Hoganas

The automotive sector demands high performance, low cost motors for fulfilling a number of applications. Höganäs AB helps its customers develop solutions utilising a powder metallurgy process, where grains of iron can be compacted and heat treated to provide a net shape product. This approach has a number of benefits but must be carefully considered in order to provide a successful product in a highly competitive market. Single sided permanent magnet axial flux machines can benefit greatly from the use of soft magnetic composites (SMC), where traditional design methods prove difficult in mechanical aspects of their construction. Höganäs AB takes a modular approach to the design, yielding a high performance, low cost, and small volumetric product. Design aspects and considerations in the design are discussed along with Höganäs AB materials readily available in JMAG’s material database.

15:00 - 15:30 Coffee break
15:30 - 16:00

Magnetic Clutches in Hoist Applications, Dimitri Delkov, Heilbronn University of Applied Sciences

Magnetic clutches are used in applications where the minimum torque must be transmitted independently from the slip. Unlike the synchronous and eddy current clutches, the hysteresis clutches can operate with synchronous - and asynchronous speed and transfer the minimum torque safety. In this work new functionalities of different magnetic clutches will be introduced, especially the properties of permanently excited hysteresis clutches, the most important influencing factors for dimensioning, as well as the special advantages of using it in hoists.

16:00 - 16:30

Vibration Analysis of PMSMs Modeling techniques and comparison, Yves Thiolière, Powersys

The vibration due to EM force is the one of the critical issues for NVH of the EV powertrain. The electromagnetic force acting on the motor resonates with the eigenmode of the motor, causing vibration and noise. In order to accurately evaluate this phenomenon, it is necessary to ascertain each frequency and spatial mode in detail regarding the electromagnetic force and eigenmode of the motor. In this presentation, the approach using the correlation analysis with the measured eigen modes is introduced to identify the system stiffness accurately. Also, accurate EM forces can be obtained by detailed EM FEA and 1D control/circuit simulation with the fidelity plant models. Finally, a comparison with the measured acoustic noise proved the simulation captures the vibration due to EM force.

16:30 - 17:30

Open discussion

Questions from users & one-to-one meetings