公开(公告)号：US12078183B2

公开(公告)日：2024-09-03

申请号：US17631961

申请日：2020-09-24

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Tatsuya Yamashita ,  Shigeo Itou ,  Hiroyuki Kuramochi

IPC: F04D25/08 ,  F04D25/06 ,  F04D27/00 ,  F04D29/34

CPC classification number: F04D25/088 ,  F04D25/06 ,  F04D27/008 ,  F04D29/34

Abstract: A fan blade includes a blade body blowing air and a root portion secured to a support part. A first end part of a fall prevention member is attached to a first mount portion provided in the support part, and a second end part of the fall prevention member is attached to a second mount portion provided in the blade body. A controller controls electric energization to a DC motor to cause the fan blade to stop rotating when the fan blade breaks, the blade body is retained by the fall prevention member, the blade body is tilted, and at least one of a current value or a rotation speed measured by a measurer changes from a predetermined value.