Rotation detection or speed pickup device for miniature d-c...

Details Rotation detection or speed pickup device for miniature d-c... Rotation detection or speed pickup device for miniature d-c...

H - Electricity

02

K

73/68

H02K 23/66 (2006.01) G01P 3/488 (2006.01) H02K 7/20 (2006.01) H02K 11/00 (2006.01)

Patent

CA 1324899

ABSTRACT OF THE INVENTION In order to pick up in a simple manner which is reliable, and under rough operating conditions, a rotation of the rotor in a miniature motor excited by permanent magnets with magnet segments (12, 13) at a tangential distance with magnet segments (12, 13) distributed at the bore circumference of the stator, it is proposed to arrange in at least one pole gap between the magnet segment (12, 13) a measuring coil (4). A signal is induced by the pulsation of the stray field due to rotation of the rotor The measuring coil is advantageously arranged in a non-magnetic, preferably plastic support body held between the individual poles or the magnet segments (12, 13) respectively.

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