Saturday, January 2, 2010


Electric motors account for as much as 50% of the total energy use. Because of the inefficient design and operation of the common fixed-speed motor, much of this energy is actually wasted. Equipped with controls to vary their speed and torque to match their workload, major energy savings would be achieved.

Use of Induction motor in heating, ventilation, and air conditioning (HVAC) systems has significantly reduced energy consumption and audible noise while improving comfort and air quality. However, most efforts have coupled new motors with digital controls, using complex, unit-specific system designs to make the motor and controls compatible. These custom digital solutions are not translatable for use with other motors and systems and are often far more costly than the units they displace.

A new approach, using the optically programmable control, offers a universal, simple, and low-cost solution for HVAC systems, including those with 3phase-induction motors.

Cost associated with that directly or indirectly measure the motor speed makes many existing control designs not production viable. In this project, we study the challenging task of controlling the speed of induction motor.In our project that voice will be recognize with in the frequency limit.


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