Patent ID: 11942890
Assignee: RENESAS ELECTRONICS CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 10:
11. A motor starting method comprising:
estimating a magnetic pole position of a rotor in a stop state at a time of starting a three-phase motor;
applying a drive voltage to any two phases of the three-phase motor based on the estimated magnetic pole position of the rotor in the stop state;
estimating a position of the rotor based on a difference voltage between i) an induced voltage generated in non-energized phase during a drive voltage applying period and ii) an induced voltage generated in non-energized phase during a regeneration period immediately after or immediately before the drive voltage applying period; and
switching the phase the drive voltage applying when an absolute value of the difference voltage is less than or equal to a first threshold.