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The internal magnetic field of the sensor replaces the mechanical brush or the contact brush in the potentiometer, and the friction generated during the operation of the latter tends to reduce the service life of the device. Therefore, the non-contact magnetic Hall-effect technology used in this product family significantly reduces mechanical wear and actuator torque, thereby extending the life of the equipment. Hall-effect rotary position sensors are suitable for a wide range of demanding applications in the transportation and industrial fields and are extremely cost-effective.
Transportation Applications 1. Pedal position detection In some heavy-duty or other types of vehicles, Hall-effect rotary position sensors can be used in place of throttle cables. For example, Honeywell's RTY Series Hall-effect rotary position sensors can be mounted on the side of the pedal to measure how much the pedal is pressed down. As the driver's pedaling force increases, the amount of pressure on the pedal will increase accordingly, and more air and fuel will be delivered to the engine, and the vehicle will accelerate. When the driver releases the pedal, the Hall effect rotary position sensor senses the change in pedal position and sends a signal to the engine to reduce air and gasoline flowing through the throttle plate and the vehicle will slow down. Cables can cause problems such as over-stretching or rust, potentially increasing the burden of maintenance and recalibration. Using sensors instead of cables will optimize the response of the engine control system, thereby reducing vehicle emissions, increasing reliability, and preventing vehicles from becoming overweight. In general, the electronic remote control system is safer and more economical than the old cable connection system.
2. Suspension displacement/pitch position detection for passenger cars and trucks Hall effect rotary position sensors can be used in height systems of passenger cars or heavy vehicles to sense position changes of the suspension system. The tilting system of the passenger car can reduce the position of its superstructure and facilitate passengers to get on the train. Hall-effect rotary position sensors can be used on both the operating and executing 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 attachment to detect the height of the vehicle. Precise position sensing ensures that the vehicle is at the height required by the application, making it easier to get on and off the vehicle. Heavy duty trailers can also use Hall-effect rotary position sensors to detect the height of the trailer car to optimize the inbound flow.
3. Speedboat tilt / draught position detection Hall effect rotary position sensor can be used to detect the speedboat's tilt / draught condition. This series of sensors can accurately report the angular position of the propeller, helping the driver avoid the danger and improve the hull performance.
4. Application to Electric Bicycles Honeywell sensors are also widely used in the electric bicycle industry. For example:
1. Hall on the speed of the electric car to turn the speed change as the name suggests is the speed of electric vehicles, this is a linear speed control components, many styles but the working principle is the same. It is generally located on the right side of the electric vehicle, which is the direction of the right hand while riding, and the degree of rotation of the electric vehicle turning handle is between 0-30 degrees. Common linear Hall element models AH3503AH49EA3515A3518SS495 Such as: AH3503 linear Hall circuit consists of voltage regulator, Hall voltage generator, linear amplifier and emitter follower, its input is magnetic induction intensity, the output is proportional to the input voltage . The static output voltage (B=0GS) is about half of the supply voltage. S poles appear on the hall sensor marking surface and will drive the output above zero level; N poles will drive the output below zero level; instantaneous and proportional output voltage levels determine the flux density at the most sensitive surface of the device. Raising the supply voltage increases sensitivity.
Product features: Small size, high accuracy, high sensitivity, good linearity, good temperature stability, and high reliability. The output voltage of Hall-Turner depends on the magnetic field strength around the Hall element. Turning the handle changes the magnetic field around the Hall element, which in turn changes the output voltage of the Hall switch. There are the following signals from the Hall switch used in electric vehicles:
The type of transfer:
Output voltage: 5/5V power supply; 5V power supply.
Single Hall turn handles 1.1-4.2 (maximum) 4.2-1.1 (few);
Single Hall turn to 2.6-3.7 (rarely) 3.7-2.6;
Single Hall turns to 1-2.52.5.5-1;
Single Hall turn to 2.5-44-2.5;
Double Hall turn to 0-55-0;
Photoelectric transfer 0-5 (small) 5-0.
The vast majority of controllers currently on the market are products that identify 1-4.2V turn signals. Turn the output signal to reconstruct: to open the transfer, change the polarity of the magnet inside the switch handle, you can change the potential of the output of the switch. If there are two magnets in the turn, respectively, the two magnets are turned 180 °, and then installed; if there is only one magnet in the turn, take out the magnet, reverse 180 °, install the handle, In this way, the starting position of the working magnetic field of the Hall element in the turning handle is changed, thereby realizing the reconfiguration of the output signal of the turning handle.
2. Hall is the driving signal to the rotation of the electric vehicle motor. The brake signal is the braking signal that the motor stops rotating. The electric vehicle standard requires that when the electric vehicle brakes and brakes, the controller should be able to automatically cut off the power supply to the motor. Therefore, the electric brake lever should have a brake lever position sensing element. When the brake lever is pinched, the brake signal is transmitted to the controller. After the controller receives the brake signal, the power supply to the motor is stopped immediately. The position sensor elements of the electric brake lever include mechanical micro-switches (two kinds of mechanical normally open and mechanical normally closed) and switch-type Hall-effect sensing elements (two types of low brake and high brake). The mechanical switch type has two leads, one connected to the negative pole and the other to the disconnected wire, suitable for a low-level brake controller. For controllers that support high levels of braking, one +12V is connected and the other wire is disconnected. Hall-type three lead wires are: brake wire (fine blue +5V), negative electrode (fine black), and the remaining one is broken wire. Common unipolar switch Hall element models are: AH41/AH3144/A3144/A3282. Normally, the normally open brake signal of the machine is always high. When the brake is applied, the microswitch inside the brake is closed and its signal becomes low. Normally, the normally closed brake signal of the machine is normally low. When the brake is applied, the microswitch inside the brake switch is turned on, and the signal becomes high. The brake signal of the general electronic low-potential brake is a constant high potential. When the brake is applied, the signal of the Hall element within the brake turns over and the signal becomes low. The brake signal of the general electronic high-potential brake is normally low. When the brake is applied, the signal of the Hall element within the brake turns over and the signal becomes high. The change in the level of the brake signal is the controller's identification of whether the electric vehicle is in a braking state, thereby determining whether the controller powers the motor.
Honeywell's Application in Transportation Industry
Hall-effect rotary position sensors use magnetic fields instead of mechanical brushes or dials and are designed to measure the angular position of moving parts. This product uses a Hall-effect integrated circuit (IC) with magnetic bias to detect the rotary motion of the actuator shaft within the operating range. The principle is that the rotation of the actuator shaft causes the position of the magnet relative to the IC to change and cause the magnetic flux density to change. This change is eventually converted to a linear output.