Transcription of Motor Control Sensor Feedback Circuits
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Motor Control Sensor Feedback Circuits
2003 Microchip Technology 1 MAN894 INTRODUCTIONS ensors are a critical component in a Motor controlsystem. They are used to sense the current, position,speed and direction of the rotating Motor . Recentadvancements in Sensor technology have improvedthe accuracy and reliability of sensors, while reducingthe cost. Many sensors are now available that integratethe Sensor and signal-conditioning circuitry into a most Motor Control systems, several sensors areused to provide Feedback information on the sensors are used in the Control loop and toimprove the reliability by detecting fault conditions thatmay damage the Motor . As an example, Figure 1 pro-vides a block diagram of a DC Motor Control system toshow the Sensor Feedback provided for a typical list of the sensors that can be used to feedbackinformation to a microcontroller are listed below: Current sensors- Shunt resistor- Current-sensing transformer- Hall effect current Sensor Speed/position sensors- Quadrature encoder- Hall efect tachometer Back EMF/Sensorless Control methodFIGURE 1:Typical D
AN894 DS00894A-page 2 2003 Microchip Technology Inc. CURRENT SENSORS The three most popular current sensors in motor control applications are:
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