Patent ID: 6960847
Filing Date: 2005-11-01
Classification: H01F

Abstract:
1. An electromagnetic actuator, comprising: (A) a stationary assembly that includes (1) a hollow stator yoke composed of a soft magnetic material and (2) two coils disposed coaxially and separately in a traveling direction of the actuator inside the hollow stator yoke; and (B) a movable assembly disposed in a hollow space of the two coils to oppose thereto with a very small clearance that includes (1) a movable magnet unit and (2) a movable yoke unit, both units mounted on a single supporting shaft adjacently to each other in an axial direction of the supporting shaft, wherein the movable assembly travels in the axial direction by an electromagnetic force generated with the coils by the interaction between a magnetic field generated by the movable magnet unit and a current flowing in the coils, wherein said movable magnet unit is disposed on said single supporting shaft so as to oppose said coils radially, wherein the two coils are wound on respective separate bobbins made of a synthetic resin and having a substantially identical shape with each other, and the two bobbins with the respective coils wound thereon are disposed axially inside the stator yoke with a predetermined distance provided therebetween, wherein a pair of flanges are provided at both axial end surfaces of the respective bobbins, and at least one of the flanges has a terminal block integrally formed with the flange, and wherein an upper edge and a lower edge of the hollow stator yoke are provided with cuts for receiving the terminal block.