公开(公告)号：US10738790B2

公开(公告)日：2020-08-11

申请号：US15876446

申请日：2018-01-22

Applicant: Johnson Electric S.A.

Inventor： Chiping Sun ,  Shinghin Yeung ,  Haibo Jiang ,  Yunlong Jiang ,  Guodong Liu ,  Zhiwang Chen

IPC: G05B6/02 ,  F04D27/00 ,  F04D25/06

Abstract: A motor-driven fan device includes a motor, a processor, a storage with a lookup table stored therein, and a speed detection unit. The processor queries the lookup table or calculates to acquire the target driving voltage and a corresponding target rotating speed of the motor. When the rotating speed difference is not within the range of the preset rotating speed difference, the processor repeatedly adds a gain value to the target driving voltage to acquire a new target driving voltage, acquires the actual rotating speed and the target rotating speed, and determines whether the rotating speed difference is within the range of the preset rotating speed difference. The processor maintains the operation of the motor at the target rotating speed at that point by using the constant speed control method when the absolute value of rotating speed difference is within the range of the preset rotating speed difference.

公开(公告)号：US10230316B2

公开(公告)日：2019-03-12

申请号：US15817967

申请日：2017-11-20

Applicant: Johnson Electric S.A.

Inventor： Yue Li ,  Chiping Sun ,  Fei Xin ,  Shinghin Yeung ,  Xiuwen Yang ,  Shujuan Huang

IPC: H02P6/14 ,  H02P5/74 ,  H02P25/03

Abstract: A motor driving device for brushless direct current motors and an application apparatus thereof are provided. The motor driving device includes an inverter, a plurality of motor branches, and a microprocessor. The inverter includes a plurality of semiconductor switches to output an alternating current power via a first output terminal and a second output terminal. The plurality of motor branches are connected in parallel between the first output terminal and the second output terminal of the inverter, and each of the plurality of motor branches comprising a motor and a controllable bidirectional alternating current switch connected in series. The microprocessor controls a conduction manner of the semiconductor switches in the inverter, and whether to turn of the controllable bidirectional alternating current switch in each of the plurality of motor branches.