Download PMSM with field strengthening ability for electric vehicle propulsion

master thesis work
ELTEKNIK@CHALMERS
PMSM with field strengthening ability for
electric vehicle propulsion
Goal:
To design and characterize a permanent magnet electrical
machine (PMSM) where the direct inductance is higher than
the quadrature and to determine the performance. Relate
this performance to an existing classical PMSM.
Background:
The majority of electrical vehicles are today driven by
PMSMs. A problem is that the way they are designed, then
have a very good performance at low speed and high
torque, but a very negative consequence is that the losses
become very high at high rotational speeds. Since vehicles
very seldom operate at the high torque values, a change in
the loss map could mean efficiency improvements. An idea
is to instead design the machine so that the high-speed
losses become lower through using weaker magnets, and
instead make it easier to magnetise the machine with the
stator winding, a so called field strengthening machine.
Arc
Plan:
Check the performance of an existing PMSM using the FEM
program ANSYS MAxwell. Redesign the rotor so that the
direct inductance become higher than the quadrature
inductance. Determine the performance of the machine and
its efficiency at various operating points. Quantify the impact
in some drive cycles, for instance the NEDC,
Number of Students:
1-2
Start time:
August 2016
Contact persons:
Torbjörn Thiringer, [email protected]