The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 15, 1998
Filed:
Apr. 18, 1997
Yoshihiro Fujisaki, Matsubara, JP;
Kazuyuki Takada, Hirakata, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
To use a sinusoidal wave as a driving waveform, and reduce noise and vibration, in an inexpensive constitution, a driving apparatus for the brushless motor includes a first data latch 16 for holding the value of address Au at an output signal timing of a first edge detecting means 10, and issuing as address value Aus, and third frequency adjusting means 20, including it, for issuing the result of adding rotating frequency Fsen to the product of address error Aerr obtained by subtracting the address value Aus held by the first data latch 16 from the reference address value Aref, rotating frequency Fsen, and control gain Ka, to an address counter 9 as frequency command Fref.