Electricity: motive power systems – Positional servo systems – Digital or numerical systems
Patent
1993-02-04
1994-12-27
Shoop, Jr., William M.
Electricity: motive power systems
Positional servo systems
Digital or numerical systems
318799, 318779, 318254, H02P 116
Patent
active
053768701
ABSTRACT:
A brushless DC motor driving apparatus for a brushless DC motor which includes a rotor possessing a plurality of magnetic poles, a stator, and a stator winding with plural phases provided on the stator at a specific gap with respect to the rotor, the apparatus including: a sensor for generating sensor signals of plural phases showing a state of rotation of the rotor depending on the rotation of the rotor; a direction detector for detecting a rotating direction of the rotor from the sensor signals of plural phases and for outputting a direction signal; an initial phase detector for outputting a first phase signal depending on the direction signal and for producing an initial count value corresponding to a position of the rotor; a counter for setting an initial value corresponding to the initial count value, and for increasing or decreasing the count value depending on the direction signal and at least one of the sensor signals and for outputting a second phase signal; a waveform generator for generating a position signal of plural phases depending on the first phase signal or the second phase signal, and a power supply circuit for supplying electrical power to the stator winding depending on the position signal of plural phases.
REFERENCES:
patent: 4563625 (1986-01-01), Kornbrekke et al.
patent: 4641066 (1987-02-01), Nagata et al.
patent: 4831510 (1989-05-01), Dummermuth et al.
patent: 5013988 (1991-05-01), Sakano
patent: 5124625 (1992-06-01), Wakabayashi
patent: 5196775 (1993-03-01), Harris et al.
patent: 5216346 (1993-06-01), Murakami
Patent Abstracts of Japan, vol. 013, No. 081 (E-719) 23 Feb. 1989 & JP-A-63 262 088 (Sony Corp.) 28 Oct. 1988 * abstract *.
Inaji Toshio
Ueda Eiji
Matsushita Electric - Industrial Co., Ltd.
Shoop Jr. William M.
Sircus Brian
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