Brushless motor

Details Brushless motor Brushless motor

1997-07-23

1999-02-16

Masih, Karen

Electricity: motive power systems

Induction motor systems

318254, 318138, 318439, H02P 124

Patent

active

058724427

ABSTRACT:
A brushless motor has a field part 20, three-phase coils 21, 22, and 23, a drive block 40 for supplying a power to the coils in accordance with output signals of a position detecting block 30, and a rotation detecting block 10 for producing a rotation signal and a direction signal by using output signals of the position detecting block 30. The rotation detecting block 10 has a shaped position signal producing circuit 11 for producing plural-phase shaped position signals, a rotation signal producing circuit 12 for producing the rotation signal synchronized with the shaped position signals, and a direction signal producing circuit 13 for producing the direction signal in correspondence with levels of the shaped position signals at a timing of a level change of the rotation signal.

REFERENCES:
patent: 4963808 (1990-10-01), Torisawa et al.
patent: 5006768 (1991-04-01), Rozman
patent: 5231338 (1993-07-01), Bulgarelli et al.
patent: 5376866 (1994-12-01), Erdman
patent: 5493188 (1996-02-01), Yoshikawa et al.
patent: 5660471 (1997-08-01), Yoshiike et al.

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