advances in motor torque control pdf

More than fifty percent of total electrical energy generated is converted into
mechanical energy with the help of electric motors. If the efficiency of these motors is
improved, a large amount of energy can be saved. With the advent of power
electronics it is now possible to control the torque and speed of electric motors
precisely as needed, resulting in saving of energy.

In this book various methods of control of electric motors are discussed. Sensorless
control of motors requires the estimation of speed without actually measuring it.
Similarly now the torque is controlled directly by the direct torque control method
described in the book. Reluctance motors are also finding applications in many
industries like consumer appliances, automobiles and defense. Special application of
motors in dentistry is also described. The effect of human reaction on motor
performance is also described.

Perhaps no instrument has more optimized in dentistry and the dentist over the past
century in the mind of the public than the dental headpiece. Prior to 1870 dentists had no
driven rotary tools. During the 1850-1870 periods various other instruments were advised to
rotate burs in cavities.
Early example of clock wise drill was patented in 1864, come into use by 1871, It was with
the advent of the foot engine that the first dental hand pieces came into being.