Hall effect rotary position sensor application
The Hall effect rotary position sensor uses a magnetic field instead of a mechanical brush or dial and is dedicated to measuring the angular position of moving parts. This product uses a magnetically biased Hall-effect integrated circuit (IC) to detect the rotational motion of the actuator shaft within the operating range. The principle is that the rotation of the actuator shaft changes the position of the magnet relative to the IC and causes the flux density to change, which is ultimately converted to a linear output.
This series of sensors uses solid state Hall effect technology for non-contact operation. The internal magnetic field of the sensor replaces the mechanical brush or contact brush in the potentiometer, and the friction generated by the latter during operation tends to reduce the life of the device. As a result, the non-contact magnetic Hall effect technology used in this product line significantly reduces mechanical wear and actuator torque, extending equipment life.
Hall effect rotary position sensors are used in a wide range of demanding applications in the transportation and industrial sectors and are cost effective.
Transportation industry application
Pedal position detection
In some heavy or other types of vehicles, Hall effect rotary position sensors can be used to replace the throttle cable. For example, the Honeywell RTY Series Hall Effect Rotary Position Sensor can be mounted on the side of the pedal to measure the extent to which the pedal is depressed. As the driver's pedaling force increases, the pedal depression increases accordingly, and more air and fuel are delivered to the engine, and the vehicle accelerates. When the driver releases the pedal, the Hall effect rotary position sensor senses a change in pedal position and sends a signal to the engine to reduce air and gasoline flowing through the throttle, and the vehicle decelerates.
Cables can cause problems such as excessive stretching or rust, potentially increasing the burden of maintenance and recalibration. The use of sensors instead of cables will optimize the response of the engine control system, thereby reducing vehicle emissions, improving reliability, and preventing vehicle overweight. In general, electronic remote control systems are safer and more economical than older cable connection systems.
Figure 1: Pedal
Honeywell RTY Series Rotary Position Sensors for Pedal Position Sensing
Suspension displacement/turning position detection of passenger cars and trucks
The Hall effect rotary position sensor can be used in the height system of a passenger car or a heavy vehicle to sense the positional change of the suspension system. The passenger car's tilting system can lower the position of the upper structure and facilitate passengers to get on the bus. The Hall effect rotary position sensor can be used simultaneously on the operating and actuator ends of the system: a position sensor is used to detect the position of the joystick and a second sensor is deployed on the suspension arm or suspension arm connection to detect the vehicle height.
Precise position sensing ensures that the vehicle is at the height required by the application system, making it easier to get on and off the vehicle. Large-capacity trailers can also use Hall effect rotary position sensors to detect the height of the trailer car to optimize the inbound process.
Figure 2: Passenger car
Rotary position sensor for displacement sensing of passenger car suspension systems
Speedboat tilt / draught position detection
The Hall effect rotary position sensor can be used to detect the speed/difference of the speedboat. This series of sensors accurately reports the angular position of the propeller, helping the driver avoid danger and improve hull performance.
Figure 3: Speedboat thruster tilt / draught position
Hall effect rotary position sensor for speedboat thruster tilt/difference position sensing
Industrial application
Irrigation center control
The irrigation spray system used in large-scale agriculture is another novel application of the Hall effect rotary position sensor. This series of sensors can detect the angular extent of the sprinkler during irrigation operations to confirm whether the unit is being sprayed or 360 degrees. This can help farmers reduce water consumption and increase crop yields.
Figure 4: Irrigation center control
Hall effect rotary position sensor for detecting the steering angle of irrigation equipment
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