01-10-2012, 10:52 AM
Modeling of BLDC Motor with Ideal Back- EMF for Automotive Applications
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Abstract
Automotive Industry is targeting sustainable
transportation in near future. Therefore hybrid and electric
vehicles are going to be popular due to their sustainability,
energy saving and zero emission. Electric motors play
significant role in EV’s. In-wheel motor technology is being
used in modern electric vehicles to improve efficiency, safety
and controllability of vehicle nowadays. BLDC motor have
been demanding as in-wheel motor in electric vehicles because
of high efficiency, desired torque versus speed characteristics,
high power density and low maintenance cost. In this paper
BLDC motor with ideal back-EMF is modeled and simulated
in MATLAB / SIMULINK. Simulation model of the controller
and BLDC drive are also presented. In order to validate the
model various simulation models are studied. Simulations
results depict from developed model are satisfactory and show
correct performance of model.
INTRODUCTION
LDC have been used in different applications such as
industrial automation, automotive, aerospace,
instrumentation and appliances since 1970’s. BLDC motor
is a novel type of DC motor which commutation is done
electronically instead of using brushes. Therefore it needs
less maintenance. Also its noise susceptibility is less,
looking forward to have integral motor. Electronic
commutation technique and permanent magnet rotor cause
BLDC to have immediate advantages over brushed DC
motor and induction motor in electric vehicle application
[1]. In-wheel technology is using a separate motor mounted
inside tire for each wheel instead of one central drive train
propelling two or all four wheels in conventional electric
vehicles. It increases controllability of vehicle and decreases
chassis weight. With using in-wheel and by-wire
technologies instead of mechanical, hydraulic and
pneumatic control systems; idea of an Intelligent Fully
Electronically Controlled Vehicle (IFECV) approaches to
reality. Two wheel drive train system of a commercial
IFECV is shown in Fig. 1 [1].
SIMULATION RESULTS
Simulation results of BLDC motor under no load and load
conditions are shown. As it can be seen in Fig. 6, dynamic
response of BLDC due to its permanent magnet (low inertia)
rotor is high. Pulsating torque of BLDC is shown in Fig. 7.
Figure 8 shows back-EMF produced in phase A of motor.
Hall Effect signals of all three phase are shown in Fig. 9
according to table I. Table II shows BLDC motor
specification to investigate performance of advanced model.
CONCLUSION
Sustainable transportation is a need in near future due to
reduce energy consumption and greenhouse gases emission
in the world for solving global warming issue. Hybrid and
electrical vehicles are the good solution in this case.
Increase of safety, efficiency and controllability of a vehicle
has been always one of the most important challenges in
automotive industry. Design of intelligent fully
electronically controlled vehicle (IFCEV) can be the
solution for many of challenges in this field.
In this paper it is shown that BLDC motor is a good
choice in automotive industry due to higher efficiency,
higher power density and higher speed ranges compare to
other motor types. BLDC motor model with ideal back-EMF
is presented in this paper. The proposed model is simulated
in MATLAB / SIMULINK. Simulation results under no
load and load conditions are showing proper performance of
model. Output characteristics and simplicity of model make
it effectively useful in design of BLDC motor drives with
different control algorithms in different applications.