| 摘要 |
PURPOSE: Measurement device of rotating speed and direction of a rotor is provided to detect speed and direction although a Hall sensor capable of signal detection is only one due to failure in a high-speed rotor and to stable control of a motor in a high-speed rotor more than a specific speed. CONSTITUTION: Measurement device of rotating speed and direction of a rotor includes a ring magnet (110), Hall sensors (H1,H2), a two-times multiplication signal generation unit (120), a four-times multiplication signal generation unit (130) a speed measurement unit (140) and a rotational direction judgment unit (150). The ring magnet makes N-pole and S-pole be alternatingly arranged and engaged with a rotary shaft of a rotor. The Hall sensor generate a pulse signal according to variation of a magnetic field of the ring magnet according to rotation of the rotary shaft. The two-times multiplication signal generation unit outputs an orthogonal two-times multiplication signal using the pulse signal generated in one Hall sensor. The four-times multiplication signal generation unit outputs a four-times multiplication pulse signal generated by logically performing XOR from the two-times multiplication pulse signal. The speed measurement unit calculates a rotational speed of the rotor using the four-times multiplication pulse signal. The rotational direction judgment unit judges whether the rotation is forward or reverse using the two-times multiplication pulse signal. [Reference numerals] (120) Two-times multiplication signal generation unit; (130) Four-times multiplication signal generation unit; (140) Speed measurement unit; (150) Rotational direction judgment unit; (160) Controlling unit |
