Piece of length l and width for b, d thickness of semiconductor chips, when it is placed in a magnetic induction intensity for magnetic field b, if in its opposite sides circulation control current I, and the orthogonal direction to that of the current magnetic field direction, the other sides in the semiconductor will produce a and control the current of electric potential and magnetic induction intensity b is directly proportional to the product I, UH, UH = KHIB, namely the KH for the sensitivity of hall element, the electric potential is called the hall voltage, the semiconductor wafer is hall element, its size and external magnetic field and electric current is proportional to the. Hall switch sensor due to its small volume, non-contact, good dynamic performance, long life and other characteristics, widely used in the measurement of rotating object rotation speed field. Here choose SPRAGUE wrote the company produces the hall speed sensor, it is a kind of silicon monolithic integrated circuit, its internal voltage regulation circuit, hall voltage generator, amplifier, schmidt triggers and open collector output circuit, with wide working voltage range, high reliability, simple external circuit, the output level can be compatible with all kinds of digital circuits, etc. Hall sensor signal amplifier will enlarge hole electric potential UH then through plastic, amplifier, the output of equal amplitude and frequency square wave signals, the hall voltage amplitude changes over the intensity of magnetic field. Speed measurement method has a lot of kinds, according to the pulse counting speed measurement methods mainly include M method (Frequency measurement method), T (The cycle method)And MPT method (Frequency cycle method)。 The system adopts the M method (Frequency measurement method)And hall sensor of speed measuring circuit. the main products: stepper motor, brushless motor, servo motor, stepping motor drive, brake motor, linear motor and other kinds of models of the stepper motor, welcome to inquire. Telephone:
