US 12,407,291 B2
Motor control device, motor device, wiper device, and motor control method
Ryo Ohori, Gunma (JP); Toshiyuki Amagasa, Gunma (JP); Masahiro Yamada, Gunma (JP); Atsushi Mochida, Gunma (JP); and Tamotsu Iwazaki, Gunma (JP)
Assigned to MITSUBA Corporation, Gunma (JP)
Filed by MITSUBA Corporation, Gunma (JP)
Filed on Jun. 18, 2023, as Appl. No. 18/337,035.
Claims priority of application No. 2022-153220 (JP), filed on Sep. 27, 2022.
Prior Publication US 2024/0106377 A1, Mar. 28, 2024
Int. Cl. H02P 27/08 (2006.01); B60S 1/08 (2006.01); H02P 25/03 (2016.01)
CPC H02P 27/085 (2013.01) [B60S 1/0896 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A motor control device which controls a motor having an output shaft, the motor control device comprising:
a processor configured to:
detect a vehicle speed, which is a traveling speed of a vehicle mounted with the motor;
based on the vehicle speed detected perform control of switching between a first driving mode which drives the motor, and a second driving mode in which a number of revolutions of the output shaft and an output of the motor are higher than in the first driving mode;
switch from the first driving mode to the second driving mode in a case where the vehicle speed becomes equal to or greater than a predetermined first threshold; and
switch from the second driving mode to the first driving mode in a case where the vehicle speed becomes equal to or less than a second threshold lower than the first threshold;
wherein the second driving mode is a driving mode of a rectangular wave driving method,
the first driving mode is a driving mode of a non-free driving method that outputs a driving signal of an intermediate power by pulse width modulation control for an open period of a non-energized phase among driving signal lines of a plurality of phases driving the motor,
the processor is configured to switch from the driving mode of the non-free driving method to the driving mode of the rectangular wave driving method in a case where the vehicle speed becomes equal to or greater than the first threshold, and
the processor is configured to switch from the driving mode of the rectangular wave driving method to the driving mode of the non-free driving method in a case where the vehicle speed becomes equal to or less than the second threshold.