Method and apparatus for electronically commutating an electric

Details Method and apparatus for electronically commutating an electric Method and apparatus for electronically commutating an electric

1999-05-13

2000-02-08

Ro, Bentsu

Electricity: motive power systems

Limitation of motor load, current, torque or force

318254, 318430, H02P 618, H02P 620

Patent

active

060231416

ABSTRACT:
In a method for operating a brushless motor with commutated stator excitation and permanent rotor field, the stator is initially energized partly. Depending on the polarity of the back electromagnetic force (EMF) in the non-energized stator coil at a predetermined time point (t(n)+T.sub.OFF) and on the occurrence of a EMF zero-crossing event in a following time frame (T.sub.MONITOR), the next stator commutation (t'(n+1)) is scheduled. Thereby, three cases (i)(ii)(iii) are distinguished and detected events (.tau.(n-1)) in previous commutation cycles (n-1) are taken into account.

REFERENCES:
patent: 4751447 (1988-06-01), Okachi
patent: 5017845 (1991-05-01), Carobolante et al.
patent: 5233275 (1993-08-01), Danino
patent: 5327053 (1994-07-01), Mann et al.
patent: 5534763 (1996-07-01), Williams et al.
patent: 5650699 (1997-07-01), Tang et al.
patent: 5663618 (1997-09-01), Adachi et al.
patent: 5672948 (1997-09-01), Cohen et al.
patent: 5751128 (1998-05-01), Chalupa et al.
"Sensorless Position and Speed Control of a Brushless DC Motor from Start-up to Nominal Speed", L. Cardoletti et al. From the Swiss Federal Institute of Technology, Lausanne, Switzerland (EPFL), EPE Journal, vol. 2, No. 1, Mar. 1992.

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