Patent ID: 6674350
Filing Date: 2004-01-06
Classification: H01F,Y10T

Abstract:
An electromagnetic actuator comprising:a stationary member including a first core section carrying a first coil wound around a periphery thereof; a movable member including a second core section carrying a second coil wound around a periphery thereof, said stationary member and said movable member being arranged with a pair of gaps to form a closed magnetic circuit by way of said first core section, one of the pair of gaps, said second core section and the other of the pair of gaps; a support member including a spring displaceably supporting said movable member relative to said stationary member; and an electric current source for supplying electricity to said first coil and said second coil, wherein said first coil and said second coil are connected in series to said electric current source to generate a magnetic flux which runs through the closed magnetic circuit, a magnetic force being attractive or repulsive between said stationary member and said movable member according to the winding direction of said first coil or said second coil, and wherein a displacement of said electromagnetic actuator is obtained from a balanced relationship of a force generated by said spring and the magnetic force.