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

Claim 2:
3. The motor drive control device according to claim 2, wherein
the current zero crossing point estimation unit determines whether an ON period of the drive voltage matches the ON period of the signal for turning on or off the high side switch, detects at least one of a timing for switching from a state of the ON period of the drive voltage matching the ON period of the signal for turning on or off the high side switch to a state of the ON period of the drive voltage not matching the ON period of the signal for turning on or off the high side switch and a timing for switching from the state of the ON period of the drive voltage not matching the ON period of the signal for turning on or off the high side switch to the state of the ON period of the drive voltage matching the ON period of the signal for turning on or off the high side switch, and estimates the detected timing as a zero crossing point of the coil current of the predetermined phase.