D.C. brushless motor with an improved yoke

Claim 1

A D.C. brushless motor, comprising: (a) a rotor having a plurality of magnets; and (b) a stator having a generally cup-shaped metallic yoke, a drive coil, a drive circuit, a magnetoelectric transducer, terminals, and an insulating base plate attached to said yoke, said base plate having a recess and wall surrounding said recess for defining a circuit housing at a first side, both said base plate and said walls being made of a synthetic resin being integral with each other, said drive circuit being formed on a substrate on which said magnetoelectric transducer is also placed, said substrate carrying said drive circuit and said magnetoelectric transducer on a front surface thereof being received in said recess of said base plate side of said substrate is flush with a second side of said, said circuit housing being filled with a synthetic resing so as to hermetically seal said drive circuit and said magnetoelectric transducer, said drive coil being placed on said first side of said base plate at a place other than said circuit housing, at least one of said walls radially protruding from the periphery of said base plate, said terminals being embedded in said at least one wall and being connected to said drive circuit at one ends thereof and the other ends thereof being protruding from said first side of said base plate, said terminals extending in a direction normal to a plane of said base plate toward said rotor, said base plate being positioned on a substantially flat bottom of a center recess of said yoke such that said first side faces said magnets of said rotor with a second side of said base plate being substantially in close contact with said bottom of said center recess of said yoke, said substantially flat bottom of said center recess of said yoke substantially facing an entire one side surface of said rotor.