| 摘要 |
PURPOSE:To provide a control circuit for brushless motor which can prevent vibration and noise. CONSTITUTION:The sensor signal of a rotary angle detection sensor SA1 is supplied to a multiplication synchronization pulse generation circuit 38 and is supplied to a gate drive signal generation circuit 46 as a multiplication synchronization signal synchronized to a frequency which is three times larger than that of a rotor 10. The gate drive signal generation circuit 46 controls the drive of a motor drive circuit 22 based on the multiplication synchronization signal, thus supplying a coil winding current without any scattering of phase to motor coil windings 16U, 16V, and 16W, preventing torque ripple or the unneeded suction force for the rotor 10, and smoothly rotating the rotor 10 without any vibration and noise. |
