National Institute of Science & Technology Motor sensor control using feedback circuit Ajit kumar subudhi EE [1] MOTOR SENSOR CONTROL USING FEEDBACK CIRCUIT AJIT KUMAR SUBUDHI EE Under the guidance of Mr.Debasisha Jena

National Institute of Science & Technology Motor sensor control using feedback circuit Ajit kumar subudhi EE [2] INTRODUCTION Sensors are a critical component in a motor control system. They are used to sense the current, position, speed and direction of the rotating motor Many sensors are now available that integrate the sensor and signal-conditioning circuitry into a single package.

National Institute of Science & Technology Motor sensor control using feedback circuit Ajit kumar subudhi EE [3] TYPES OF SENSOR USED IN FEEDBACK CIRCUIT Current sensors - Shunt resistor - Current-sensing transformer - Hall effect current sensor Speed/position sensors - Quadrature encoder - - Hall effect tachometer Back EMF/Sensor less contr ol

National Institute of Science & Technology Motor sensor control using feedback circuit Ajit kumar subudhi EE [4] CURRENT SENSORS The three most popular current sensors in motor control applications are: Shunt resistors Hall effect sensors Current transformers

National Institute of Science & Technology Motor sensor control using feedback circuit Ajit kumar subudhi EE [5] CURRENT SENSOR Shunt resistors are popular current sensors because they provide an accurate measurement at a low cost. Hall effect current sensors are widely used because they provide a non-intrusive measurement Current-sensing transformers are especially used in high-current or AC line-monitoring applications.

National Institute of Science & Technology Motor sensor control using feedback circuit Ajit kumar subudhi EE [6] COMPARATOR REFERENCE VOLTAGE In single supply comparators, a reference voltage must be created The circuits create VREF by using a resistor voltage divider. The offset voltage of VREF enables the circuit to function as a zero-crossing detector without requiring a dual voltage power supply.

National Institute of Science & Technology Motor sensor control using feedback circuit Ajit kumar subudhi EE [7]. QUADRATURE ENCODER A quadrature encoder can be used to provide the speed, direction and shaft position of a rotating motor. The typical quadrature encoder is packaged inside the motor assembly and provides three logic-level signals that can be directly connected to the micro controller. Motor speed is determined by the frequency of the Channel A and B signals.

National Institute of Science & Technology Motor sensor control using feedback circuit Ajit kumar subudhi EE [8]

National Institute of Science & Technology Motor sensor control using feedback circuit Ajit kumar subudhi EE [9] HALL EFFECT TACHOMETERS These sensors are based on using the Hall element to sense the change influx in the air gap between a magnet and a notch in a rotating shaft or a passing ferrous gear tooth The circuitry inside the sensor typically consists of a comparator or Schmitt trigger to provide a digital output signal that can be directly connected to the micro controller.

National Institute of Science & Technology Motor sensor control using feedback circuit Ajit kumar subudhi EE [10]

National Institute of Science & Technology Motor sensor control using feedback circuit Ajit kumar subudhi EE [11] CONCLUSION That may damage the motor. Feedback sensors serve a critical role in a motor control system. These sensors provide information on the current, position, speed and direction of a rotating motor. The sensors improve the reliability of the motor by detecting fault conditions

National Institute of Science & Technology Motor sensor control using feedback circuit Ajit kumar subudhi EE [12] THANK U

National Institute of Science & Technology Motor sensor control using feedback circuit Ajit kumar subudhi EE [13]