Power source for a solenoid controlled fluid pressure device Patent #: 4432033
ApplicationNo. 06/586030 filed on 03/05/1984
US Classes:361/152, Including particular drive circuit123/90.11, Electrical system361/210Plural coils
ExaminersPrimary: Moose, Harry E. Jr.
Attorney, Agent or Firm
International ClassesF01L 9/04 (20060101)
H01F 7/08 (20060101)
H01F 7/18 (20060101)
Foreign Application Priority Data1983-03-04 DE
AbstractA method of and an apparatus for activating an electromagnetic positioning means or actuator of the kind sometimes known as an electrical cam with relatively low currents, by alternately energizing, or energizing with currents of opposite polarity, two electromagnets to move an armature positioned therebetween between two terminal positions. The device is activated from an inactive or passive to an active state by energizing currents having at least initially a frequency greater than the resonant frequency of the positioning means. With increasing oscillations of the armature the frequency of the energizing current is reduced to zero as the device reaches its fully activated state, i.e. when the armature has oscillated in a step-like manner to one of its terminal positions. The device may be have utility for driving gas exchange valves of internal combustion engines.