H - Electricity – 02 – K
Patent
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
Deavers Clyde J.
Reffelt James
Gowling Lafleur Henderson Llp
Rotron Incorporated
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