| 摘要 |
PROBLEM TO BE SOLVED: To supply a driving signal suitable for linear drive by suppressing a power consumption by a Hall bias circuit and removing harmonic signals.SOLUTION: A bias power supply 1 outputs an energization current to a Hall element 5 chopped by an oscillator 2, and a Hall amplifier 3 for amplifying an output signal of the Hall element 5 to output a phase signal depending on a rotor position of a DC brushless motor is subjected to phase compensation having a primary pole whose frequency is generally one tenth of an output signal of the oscillator 2, so that harmonic signals can be removed from a driving signal for the motor 50 output from a motor driving driver 4. |
