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The Hall element is a magnetic sensor based on the Hall effect. They can be used to detect the magnetic field and its changes, and can be used in various applications related to the magnetic field. Hall elements have many advantages. They are firm in structure, small in size, light in weight, long in life, easy to install, low in power consumption, high in frequency (up to 1MHZ), resistant to vibration, and not afraid of dust, oil, water vapor, salt spray, etc.
Hall Effect Sensor
According to the function of the Hall element, they can be divided into: Hall linear device and Hall switch device. The former outputs analog quantities, and the latter outputs digital quantities.
According to the nature of the detected objects, their applications can be divided into direct applications and indirect applications. The former is to directly detect the magnetic field or magnetic characteristics of the object to be inspected, and the latter is to detect the artificial magnetic field on the object to be inspected. This magnetic field is used as the carrier of the detected information. Through it, many non-electric and non-magnetic The physical quantities such as force, torque, pressure, stress, position, displacement, speed, acceleration, angle, angular velocity, number of revolutions, rotation speed, and the time when the working state changes, etc., are converted into electricity for detection and control.
According to the induction method of Hall switches, they can be divided into: unipolar Hall switches, bipolar Hall switches, and omnipolar Hall switches. The induction method of the unipolar Hall switch: a magnetic pole of the magnetic field is close to it, and a low potential voltage (low level) or off signal is output, and the magnetic pole of the magnetic field leaves it and a high potential voltage (high level) or on signal is output, but It should be noted that the unipolar Hall switch will specify a certain magnetic pole for induction to be effective, generally the front side induces the S pole of the magnetic field and the reverse side induces the N pole. The induction method of the bipolar Hall switch: because the magnetic field has two magnetic poles N and S (positive or negative magnetic), the two magnetic poles control the on and off (high and low level) of the bipolar Hall switch respectively. Generally, it has a locking effect, that is, when the magnetic pole leaves, the Hall output signal does not change until another magnetic pole is induced. In addition, the initial state of the bipolar Hall switch is a random output, which may be high or low. The induction method of the omnipolar hall switch: the induction method of the omnipolar hall switch is similar to that of the unipolar hall switch, the difference is that the unipolar hall switch will specify the magnetic pole, and the omnipolar hall switch The switch will not specify the magnetic pole, any magnetic pole close to the output low-level signal, and away from the output high-level signal.
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