公开(公告)号：US11101766B2

公开(公告)日：2021-08-24

申请号：US16642381

申请日：2018-07-25

Applicant: MITSUBA Corporation

Inventor： Takashi Tai ,  Hisashi Azami

IPC: H02P29/66 ,  H02P6/15 ,  B60S1/08

Abstract: A wiper device is provided. A boost control unit, if a duty ratio has reached an upper limit value determined in advance, and if the rotational speed of a motor is less than a target rotational speed, varies an advance angle and an energization angle associated with the energization of the motor in accordance with the target rotational speed. An overtemperature protection unit monitors a load state of the motor, and, upon detecting a high-load state, performs a first protection control for decreasing the rotational speed of the motor. A demagnetization protection unit, upon receipt of an operating signal from a wiper switch when the temperature detected by means of a temperature sensor exceeds a first threshold and the first protection control is being performed, performs a second protection control for fixing the advance angle and energization angle of the motor by prohibiting the operation of the boost control unit.