公开(公告)号：EP3435537B1

公开(公告)日：2020-11-04

申请号：EP18178858.9

申请日：2018-06-20

申请人： Sunonwealth Electric Machine Industry Co., Ltd.

发明人： HORNG, Alex ,  Chiu, Chih-Hsiang

IPC分类号： H02P7/29 ,  H02P6/08

公开(公告)号：EP3435537A1

公开(公告)日：2019-01-30

申请号：EP18178858.9

申请日：2018-06-20

申请人： Sunonwealth Electric Machine Industry Co., Ltd.

发明人： HORNG, Alex ,  Chiu, Chih-Hsiang

IPC分类号： H02P7/29 ,  H02P6/08

摘要： A method for controlling a rotational speed of a fan ( F ) includes using a control unit (1) to start a motor (2) according to an initial duty cycle value ( D ). In a first constant speed step ( S1 ), the duty cycle value ( D ) is changed to make a motor rotational speed ( R ) equal to a first target rotational speed ( R1 ). When the duty cycle value ( D ) and a first target duty cycle value ( D1 ) satisfy a first relational expression, the motor rotational speed ( R ) is compared with a second target rotational speed ( R2 ), and the duty cycle value ( D ) is changed to make the motor rotational speed ( R ) equal to the second target rotational speed ( R2 ). When the duty cycle value ( D ) and a second target duty cycle value ( D2 ) satisfy a second relational expression, the first constant speed step ( S1 ) is performed. A fan ( F ) is also disclosed.