| 摘要 |
PROBLEM TO BE SOLVED: To provide a brushless DC motor using a linear Hall-effect sensor which can be applied to a motor-driven system with a narrow development space, by eliminating a speed sensor and thus ensuring a development space as well as to provide a realization method of a motor signal. SOLUTION: Disclosed is a realization method of a speed signal of a motor using a linear Hall-effect sensor characterized by comprising the steps of: by using a Hall signal in the form of a sine wave of a linear Hall-effect sensor, determining coordinate values on an x-y coordinate system of the position sensor; evaluating a summed coordinate value of the above coordinate values; calculating the angle(theta) formed by a summed coordinate value and the x axis; determining the quadrant of the resulted angle(theta); and determining a speed signal by dividing the final motor displacement value by the rate of time change. COPYRIGHT: (C)2009,JPO&INPIT
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