Solenoid construction and method for making the same

H - Electricity – 01 – F

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26/119, 310/60

H01F 7/13 (2006.01) H01F 7/16 (2006.01)

Patent

CA 1223026

14 SOLENOID CONSTRUCTION AND METHOD FOR MAKING THE SAME ABSTRACT OF DISCLOSURE A proportional solenoid consisting of a stationary pole piece (39) of ferromagnetic material which has a radially externally facing frusto-conical section (54) surrounding a cylindrical recess (56) in the stationary pole piece (39). Both the stationary pole piece (39) and armature (45) are fitted into the bore of a guide tube (36). Thus, the bore of the guide tube provides the required concentricity between the movable armature and the stationary pole piece. The movable armature is provided with an integral reduced diameter cylindrical nose (62) that is complementary to the cylindrical recess (56) of the stationary pole piece.

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