What is a Hall effect position sensor?
What is a Hall effect position sensor?
A Hall effect sensor (or simply Hall sensor) is a type of sensor which detects the presence and magnitude of a magnetic field using the Hall effect. It is named for the American physicist Edwin Hall. Hall sensors are used for proximity sensing, positioning, speed detection, and current sensing applications.
How accurate are Hall effect sensors?
Regarding accuracy, currently available Hall effect sensors can achieve output error as low as 1%. A well-designed resistive current-sense circuit could surpass this, but 1% would generally be adequate in the high-current/high-voltage applications for which Hall effect devices are particularly suitable.
How does a Hall Effect sensor fail?
Various possible faults may happen in a Hall Effect sensor such as flaws in the core (corrosion, cracks, residual magnetic fields and core breakage), changes in the bias current, change in the magnetic properties of the ferrite core due to temperature variations, changes in the orientation of the induced magnetic field …
What is the range of a Hall Effect sensor?
When no magnet is present (B = 0), the output voltage is VQ (typically 1V). The presence of a magnetic field scales the output toward 2V or 0V. The usable range is between 0.2V and 1.8V, since the B-response becomes nonlinear close to the rails.
How is Hall effect used in position sensing?
With the extensive variety of solutions available for position sensing and level sensing, designers can select optimum technologies and packages to meet their commercial and engineering goals. Of these solutions, Hall-effect technology, with its application of contactless magnetic sensing, provides exceptional value and reliability.
What are the coefficients of a Hall sensor?
The Hall sensor exhibits two temperature coefficients: one for magnetic sensitivity (calibration), and the other as an offset (zero) change. The temperature effect on calibration is a percent of reading error and the zero effect is a fixed field value error depending on the temperature.
How are magnets measured with Hall effect sensors?
With a known magnetic field, its distance from the Hall plate can be determined. Using groups of sensors, the relative position of the magnet can be deduced. Hall Effect sensors are used for proximity switching, positioning, speed detection, and current sensing applications.
How is the Hall sensor connected to the motor?
Among them, the motor is connected to the seat position adjustment mechanism to form a power part; and the single chip microcomputer is connected to the motor control circuit and the Hall sensor to form an automatic control part.
What is a Hall effect position sensor? A Hall effect sensor (or simply Hall sensor) is a type of sensor which detects the presence and magnitude of a magnetic field using the Hall effect. It is named for the American physicist Edwin Hall. Hall sensors are used for proximity sensing, positioning, speed detection, and current…