Patent ID: 11901851
Assignee: MINEBEA MITSUMI IN.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 1:
2. The motor drive control device according to claim 1, wherein
the current zero crossing point estimation unit compares a drive voltage of the coil of the predetermined phase to at least one of an ON period and an OFF period of a signal for turning on or off the high side switch corresponding to the predetermined phase in every cycle of the PWM signal and estimates the zero crossing point of the coil current of the predetermined phase based on the comparison result, and
the adjustment instruction signal generation unit is configured of a phase adjustment determination unit configured to determine whether the phase adjustment of the coil current is necessary based on the phase difference between the target point determined by the target point determination unit and the zero crossing point estimated by the current zero crossing point estimation unit.