National Institute of Science & Technology Motor sensor control using feedback circuit Ajit kumar...

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Motor sensor control using feedback circuit

Ajit kumar subudhi EE200118307 [1]

MOTOR SENSOR CONTROL USING FEEDBACK CIRCUIT

AJIT KUMAR SUBUDHI EE200118307

Under the guidance of

Mr.Debasisha Jena

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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.

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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 control

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CURRENT SENSORS

• The three most popular current sensors in

motor control applications are:

• Shunt resistors

• Hall effect sensors

• Current transformers

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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.

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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.

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.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.

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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.

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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

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THANK U

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National Institute of Science & Technology Motor sensor control using feedback circuit Ajit kumar...

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