VHDL-AMS Modeling of an Electric Power Steering System in a .pdf

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VHDL-AMS Modeling of an Electric Power Steering System in a Multi-Physics Simulation Environment
VHDL-AMS Modeling of an Electric
Power Steering System in a Multi-
Physics Simulation Environment.
SEKISUE, Takayuki
Ansoft Japan K.K.
© 2008 Ansoft, LLC All rights reserved.
Ansoft, LLC Proprietary
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Presentation Goals
• Mechanical modeling in SIMPLORER
– About the mechanical system model’s description and the
usage.
– About the description of the motor drive part
• VHDL-AMS model
• System simulation with power unit
© 2008 Ansoft, LLC All rights reserved.
Ansoft, LLC Proprietary
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Introduction
• In the design of the electric equipment component, the
optimization of the equipment unit has been advanced.
• On the other hand, modeling a complex phenomenon
and detailed operation is requested by making to high
performance in the design of the system that controls
them.
• Cannot a new solution point be found by sharing the
simulation model as both cooperating?
– This presentation introduces the example of
simulating the subsystem as an example of EPS
control model and driving system.
Demand
definition
Accept total
system
Topology
layout
Subsystem
verification
– The example of simulating a necessary element
technology is referred to make it to high accuracy.
– And this introduces everything from each
simulation result to the power management as an
example of designing the total system.
Subsystem
design
Built-in
verification
Optimize of
elements
© 2008 Ansoft, LLC All rights reserved.
Ansoft, LLC Proprietary
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SIMPLORER OverView
• SIMPLORER can be applied not only for electrical circuits
but also Multi-domain system & circuit.
ePhysics
SIMPLORER
EQU
Celsius
RTH_Chip
K := 1.5
RTH_Case
K := 0.2
tra
TSF
TR1 ROT2
H1
RTH_Sink_Rad
H
K := 1.02
K := 4.2
VHDL-AMS
CTH_J
C_TH := 1m
CTH_Chip
C_TH := 10m
CTH_Case
C_TH := 0.1
RTH_Sink_Conv
Wheel_dynamics
Mechanical model design
THM1
THM2
THM3
Θ
Tambient
VALUE := 300
Q3D
Common mode- noise
PEL
A
OMEGA
Maxwell
B
3 ~
M
C
I1A
I1B
I1C
N
Thermal model design
Design of magnetic
components
© 2008 Ansoft, LLC All rights reserved.
Ansoft, LLC Proprietary
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Steering assist system.
Composition
1. Steering
2. Torsion bar
&
Column shaft
Deceleration
gear
3. Intermediate shaft
• Change of the assistant gain by vehicle speed
• The moment of self aligning
6.Assist motor
=> These have not been considered yet
4.Rack & Pinion gear
Diagram
+
Side force
Steering
Torque sensor
Rack & Pinion
+
Vehicle speed
Assist motor
Slip angle
ࣗಈं޻ֶೖ໳ ɿ໺࡚ത࿏ ஶɿࢁւಊ ISBN 4-381-08855-7
© 2008 Ansoft, LLC All rights reserved.
Ansoft, LLC Proprietary
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