Wednesday, April 1, 2009

AC Servo Motor Control Algorithm

A precise control of AC servo motor using neural
network PID controller
A new control technique based on a neural network, is proposed
here for control of AC servo motors. The PID control is widely
used in servo systems as it has simple structure, safety and
reliability. However, it has certain problems in a complex system,
resulting in imperfect action in the presence of uncertain
parameters. To solve these problems, a new hybrid control
algorithm of the PID controller is proposed, which could
prove the adequacy of the proposed control algorithm through
simulation and experiments after driving the AC
servo motor system using neural network PID controller.

Structure of PID controller using neural network control

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Position Control of an AC Servo Motor Using

In this paper, a new method of controlling position of
AC Servomotor using Field Programmable Gate Array (FPGA).
FPGA controller is used to generate direction and the number of
pulses required to rotate for a given angle. Pulses are sent as a square
wave, the number of pulses determines the angle of rotation and
frequency of square wave determines the speed of rotation. The
proposed control scheme has been realized using XILINX FPGA
SPARTAN XC3S400 and tested using MUMA012PIS model
Alternating Current (AC) servomotor. Experimental results show that
the position of the AC Servo motor can be controlled effectively.

A servo motor is an Electro-mechanical device in which the
electrical input determines the position of the armature of
a motor. The shaft of the servo motor can be positioned to a
specific angle by sending the coded signal. The AC servo
motors have been widely used in the industrial fields and
various approaches have been made to realize high
performance motion control. These can be effectively utilized
in many position control systems subjected to external
disturbances such as friction.
With successively improving reliability and performance of
digital controllers, the digital control techniques have
predominated over other analog counter parts. The advantages
of digital controllers are:

• Reconfigurability
• Power saving options
• Less external passive components
• Less sensitive to temperature variation
• High efficiency

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New Digital Hardware Control Method for High
Performance AC Servo Motor

Today’s motor drives widely use Digital Signal
Processor (DSP) or Microcontroller to
implement the digital control algorithm. Most
recently new requirements have arisen. These
include faster torque control update with flexible
design capability of motion peripherals for high
performance military servo drive applications.
A Complete digital hardware based AC servo
drive development system has been developed to
satisfy increasing demand for performance
enhancement. Based on the FPGA, the system is
configurable for either induction or permanent
magnet machine servo control. The detail design
of complete hardware based high performance
AC servo drive system is discussed.

Control Block Diagram

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FPGA Based Speed Control of AC Servomotor
Using Sinusoidal PWM

This paper presents a Xilinx Field Programmable Gate Array
(FPGA) based speed control of AC Servomotor using sinusoidal
PWM technique. Xilinx FPGA is a programmable logic device
developed by Xilinx which is considered as an efficient hardware
for rapid prototyping. It is used to generate 50 Hz sine wave, the
triangular wave and the sinusoidal PWM signals. The sinusoidal
pulse width controls the speed of Motor. The proposed control
scheme has been realized using Xilinx FPGA SPARTAN
XC3S400 and tested using SM115 model Alternating Current
(AC) servomotor. The result provides a controllable speed with
satisfactory dynamic and static performances.

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