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Journal of Modelling and Simulation of Systems (Vol.1-2010/Iss.2)
Al-Edwan et al. / Torque Control for Brushless AC Motor using Finite Element … / pp. 90-97

Torque Control for Brushless AC Motor using
Finite Element Technique Simulation
Ibrahim Al-Edwan*. Omar O. Badran**, Georgios Pissanidis* Najah Ibrahim*
* Department of Electronic Engineering, University of Hertfordshire,
Herts, Al109AB, UK
** Department of Mechanical Engineering, Al-Balqa` Applied
University, Amman-Jordan
tel/fax: +962-6-5679773
e-mail: o_badran@yahoo.com
Submitted: 25/01/2010
Accepted: 10/03/2010
Appeared: 20/03/2010
©HyperSciences.Publisher

Abstract— In the present research a new method to measure and control the torque produced by Brushless AC
motor is introduced. In the proposed technique, anew Finite Element Analysis is used to model the Permanent
Magnet Synchronous Machines PMSM motor and its sensors. The vector field oriented control for a surface
mounted PMSM used for controlling the torque. The control loop could successfully control the torque produced by
the motor. Our new method showed persuading results of the good performance of the PMSM.

Keywords: Synchronous motors,Permanent magnet motors, Variable speed drive, Finite Element,
Electric machines.

The analysis and design of complex motor drive systems
such as (PMSM) drives is usually done utilizing modern
simulation software which can provide accurate predictions
of the system’s behavior in reality (Ong, 1998, Shahian and.
Hassul, 1993; Bimal and Bose; 2002, De Gersem et al., 2000;
Ho et al 2001;Jabbar et al., 2003, Pedro et al., 2003;
Petkovska and Cvetkovski 2006; Vas, 1998). Consequently,
computer modeling of such systems at a desired level of
accuracy becomes an essential part of the design process. A
satisfying system model usually serves as a prototype for the
system behavior simulations, as well as the small signal
analysis and control design.

1. INTRODUCTION
Permanentmagnet AC machines are synchronous motors
with permanent magnets mounted on the rotor and polyphase armature windings located on the stator. Since the field
is provided by the permanent magnets, the PM machine has
higher efficiency than other AC machines such as induction
and switched reluctance motors. It also draws better power
factor and has higher power density. The advantages of
PermanentMagnet Synchronous Machines (PMSM),
combined with the decreasing cost of permanent magnets and
the advancement in the area of modern power electronics has
allowed researchers a great deal of flexibility in
implementing complex control routines. Consequently, these
have led to a widespread use of PMSM in many variablespeed drives such as robotic actuators, computer disk drives,
domesticappliances, automotive applications, and heatingventilating-air conditioning (HVAC) equipment (Gieras and
Wing, 1989).

In this paper, the vector field oriented control for a surface
mounted PMSM will be introduced. And the implementation
of this model using the Matlab and Finite Element Analysis
(FEA) will be presented.
2. FINITE ELEMENT MODELING OF PMSM
The finite element method is a directnumerical
computational method which provides an approximated
solution to a large number of complicated engineering and
physical problems, which can be described by partial
differential equations.

Several control techniques have been introduced and
implemented to enhance the operation and the performance
of AC machine drives (Gieras and Wing, 1989). However,
with the advent of vectorcontrol techniques inverters, the
development of AC motor drives enters a new era. The
control of AC machine acquires every advantage of DC
machine control and frees itself from mechanical
commutation drawbacks. Therefore, PMSM are becoming
more and more popular in high-performance industrial AC
drive applications (Ong, 1998).

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