Simple brushless dc fan motor

Details Simple brushless dc fan motor Simple brushless dc fan motor

H - Electricity

02

K

310/38, 318/96

H02K 29/00 (2006.01) F04D 13/06 (2006.01) F04D 25/06 (2006.01) H02K 7/14 (2006.01) H02K 29/08 (2006.01)

Patent

CA 1205115

ABSTRACT OF THE DISCLOSURE A simplified fan and brushless DC motor employs an annular permanent magnet magnetized in segments about its circumference. Each segment is oppositely radially mag- netized with respect to the preceding segment as one pro- cedes around the magnet. Fan blades are located within the annular magnet. A coil and electromagnet structure defining two pole pieces reside outside the permanent magnet annulus. A Hall effect device switches the coil off and on in response to passage of the segments of the rotor magnet. Thus com- mutated, the single coil affects rotation of the rotor and the fan blades. A permanent magnet supported on the stator structure serves to magnetically detent the permanent magnet of the rotor, bringing the rotor to rest correctly for restarting.

435800

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