Simple brushless dc fan motor with reversing field

Details Simple brushless dc fan motor with reversing field Simple brushless dc fan motor with reversing field

H - Electricity

02

K

310/73, 318/96

H02K 29/08 (2006.01) F04D 25/06 (2006.01) H02K 7/14 (2006.01) H02K 29/00 (2006.01)

Patent

CA 1208272

ABSTRACT Simple brushless dc fan motor with reversing field A simplified fan and brushless DC motor (10) employs an an- nular permanent magnet (14) magnetized in segments about its circum- ference. Each segment is oppositely radially magnetized with respect to its adjacent segments. Fan blades (17) are located within the annular magnet (14). A coil comprising two electrically independent and bifilar wound windings (L1 and L2), connected to be oppositely energized, and an electromagnet structure defining two pole pieces (48 and 49) reside outside the permanent magnet annulus. A Hall effect device (Hl), alternately energizes the separate coil windings (L1 and L2) in response to passage of the segments of the rotor magnet (14) to alternately produce opposite magnetic fields in the pole pieces (48 and 49). Thus commutated, the double coil arrange- ment affects rotation of the rotor (11) and the fan blades (17).

445972

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