| 摘要 |
PURPOSE:To miniaturize and lighten the motor position detector by a method wherein an output from a Hall element for detecting positions is changed in a nonsteady manner, the output signals of the Hall element are processed, a stationary change section is erased, and signals from which a nonsteady change component is extracted are obtained. CONSTITUTION:A differential amplifier 100 outputs the differential signals of outputs alpha, beta from the two Hall elements, which are not shown and are arranged at symmetrical positions at 180 deg., and the signals are level-discriminated at a reference voltage - VS level in a - side level discriminator 200 while being level-discriminated at a reference voltage + VS level in a + side level discriminator 300. Negative pulses from the - side level discriminator 200 and positive pulses from the + side level discriminator 300 are added by an adding circuit 400, and the DC component is removed through a capacitor 43, thus obtaining the detecting signals of the position of revolution of the transistor motor. |
