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.

The Hall-effect rotary position sensor is suitable for a wide range of demanding applications in the transportation and industrial sectors and is cost effective.

Transportation industry application

Pedal position detection

In some heavy or other types of vehicles, Hall effect rotary position sensors can be used in place of 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.

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Suspension displacement / tilt 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.

Accurate 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 the Hall effect rotary position sensor to detect the height of the trailer car to optimize the inbound process.

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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.

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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.

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Valve position detection

This series of sensors can be widely used for valve control in industrial production processes. Oilfields, nuclear power plants, food processing plants, and beverage manufacturers all need to detect valve positions. Hall-effect rotary position sensors can be used for position detection on a variety of large and small valves to help workers confirm valve status and opening range. .

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HVAC baffle control

Heating, ventilation and air conditioning systems use a rotary position sensor to help control the baffle. The open baffle can both send outdoor cold air into the room, or it can send heating/cold air to the room with indoor window opening, both of which reduce system efficiency and increase heating/cooling costs. . The combination of a rotary position sensor and a temperature sensor helps building managers better control the HVAC system and reduce operating costs.

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What advantages should design engineers consider when choosing a Hall-effect rotary position sensor?

Reliability and long life: Sensor ICs include conditioning circuits, protection circuits and permanent magnets in a rugged package with IP67 protection. This is indispensable for equipment used in harsh environments.
Proven long life: Honeywell's RTY series of Hall-effect rotary position sensors have a design life of 15 million cycles thanks to its good bearing design and associated IC components. Honeywell has proven that the product has a lifetime of 15 million cycles, eliminating the need for customers to test themselves.

Integrated connectors: The importance of integrated connectors is reflected in two aspects: 1) smaller size: integrated connection sensors are smaller than the overall package size of sensors that rely on lead connections, so developers can design smaller overall sizes System package style; 2) Longer life: The lead may be overstretched, worn, bitten or curled. The integrated connector sensor eliminates the need for leads and is therefore more durable.

Anti-electromagnetic interference / electromagnetic compatibility: Radio waves of different frequencies may interfere with electronic devices. Honeywell's products use automotive-grade EMI/EMC protection to effectively protect the sensor from electromagnetic interference during use.

Integrated reverse polarity protection: Honeywell's RTY series integrates reverse polarity protection to prevent damage from installation errors such as reverse polarity of the positive and negative terminals that may cause a short circuit.

Standardized Input/Output (IO): Industry standard AMP connectors, 32mm mounting pitch, universal pin style, and compact package simplify the insertion and replacement process because the mounting pitch, profile, and pin style are compatible with existing equipment.
Multiple working ranges: Multiple measuring ranges provide design engineers with the range resolution required for typical applications and can withstand certain over-range measurements.

Flexibility: With low voltage and high voltage models, covering an input voltage range of 4.5 Vdc to 30 Vdc, the flexibility is practical.