Sensor in motor control is used to sense current, position, velocity and direction of the rotating motor. In most
motor control applications

, several sensors are used to provide motor feedback information. This sensor is used in the control loop and improve reliability by detecting error conditions that can damage the motor.

The three most popular sensor current in motor control applications are: Shunt resistors, Hall effect sensors and current transformers. Shunt resistor sensor current popular because they provide an accurate measurement with low cost. Hall effect sensors are widely used today because they provide non-intrusive measurement and is available in a small IC package that combines sensors and signal conditioning circuit. Current-sensing transformers sensor technology is also popular, especially in high-current, or AC-line monitoring applications.