Patent ID: 11929700
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G  H | IPC H

Claim 0:
1. An electric motor control device comprising:
processing circuitry to
receive a position detection signal from a position detector that detects a rotational position of an electric motor and outputs the position detection signal, the position detection signal including a periodic error determined according to the rotational position,
receive a position change time signal from a time detector that outputs the position change time signal obtained by detecting a time period in which the position detection signal output from the position detector changes, and
calculate and output a rotating speed of the electric motor based on the position detection signal and the position change time signal, the processing circuitry being further configured to correct the rotating speed with a speed correction value calculated by a speed correction model for correcting a periodic speed error determined according to the rotational position included in the rotating speed of the electric motor based on the position detection signal, the speed correction model compensating for an error in the position detection signal and a delay in calculating the rotating speed based on the position change time signal.