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Patent Searching and Data


Title:
ファン装置
Document Type and Number:
Japanese Patent JP6814736
Kind Code:
B2
Abstract:
[Summary] A fan apparatus has a drive circuit for an electrically-driven rotor, and includes a drive signal generating circuit portion for the electrically-driven rotor; an output stage including an upper MOSFET and a lower MOSFET; and a motor portion to be driven by the output stage. One of the upper MOSFET and the lower MOSFET is a braking MOSFET, while another of the upper MOSFET and the lower MOSFET is a non-braking MOSFET. The fan apparatus further includes a back-electromotive force supply portion arranged to supply, to the braking MOSFET, power by a back-electromotive force caused by rotation of the motor portion while a power supply voltage for the electrically-driven rotor is not being supplied; and an electromagnetic brake portion arranged to electromagnetically brake the motor portion by causing the braking MOSFET to enter an ON state through the power supplied by the back-electromotive force supply portion.

Inventors:
Motoi Otsuka
Application Number:
JP2017537782A
Publication Date:
January 20, 2021
Filing Date:
August 24, 2016
Export Citation:
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Assignee:
Nippon Densan Servo Co., Ltd.
International Classes:
F04D27/00; H02P3/22
Domestic Patent References:
JP2009213234A
Attorney, Agent or Firm:
Kozo Aoyama
Nidec Corporation
Toshihiro Ishizuka