| 摘要 |
PROBLEM TO BE SOLVED: To provide a DC brushless motor system capable of rationally stably operating even against a change in a switching spike pulse or a rotor load. SOLUTION: The DC brushless motor system drives an inverter by position detection signals Sv2, Su1,... for detecting rotary positions of a rotor to operate a motor. When a chopping pulse h3 has a switching spike pulse j3, the signal Su1 detects a false intersection Pz to become a false position detection signal Su1. When a time t1 is shorter than a reference time value Ts obtained based on plural times of the time t1 between the respective position detection signals Sv1, Su1,... and the chopping period tp, a signal detected after a period tp or a predetermined time Δts is used as a normal position detection signal Su1. When a rotor load has a change, it is detected by comparing with a reference time Tss shorter by a predetermined time Δtr than the time Ts. When the residue of the chopping pulse h4 from the signal Su1 is a pulse width of 1/4 or more, it is used as the normal position detection signal Su1. |
