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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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Motor sensor control using feedback circuit
Ajit kumar subudhi EE200118307 [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.
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Motor sensor control using feedback circuit
Ajit kumar subudhi EE200118307 [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 control
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Motor sensor control using feedback circuit
Ajit kumar subudhi EE200118307 [4]
CURRENT SENSORS
• The three most popular current sensors in
motor control applications are:
• Shunt resistors
• Hall effect sensors
• Current transformers
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Motor sensor control using feedback circuit
Ajit kumar subudhi EE200118307 [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.
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Motor sensor control using feedback circuit
Ajit kumar subudhi EE200118307 [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.
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Motor sensor control using feedback circuit
Ajit kumar subudhi EE200118307 [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.
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Motor sensor control using feedback circuit
Ajit kumar subudhi EE200118307 [8]
Nati
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Motor sensor control using feedback circuit
Ajit kumar subudhi EE200118307 [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.
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Motor sensor control using feedback circuit
Ajit kumar subudhi EE200118307 [10]
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Motor sensor control using feedback circuit
Ajit kumar subudhi EE200118307 [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
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Motor sensor control using feedback circuit
Ajit kumar subudhi EE200118307 [12]
THANK U
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Motor sensor control using feedback circuit
Ajit kumar subudhi EE200118307 [13]