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    • 97. 发明专利
    • EXCITING METHOD OF ELECTROMAGNETIC ACTUATOR
    • JP2001217123A
    • 2001-08-10
    • JP2000341792
    • 2000-11-09
    • BAYERISCHE MOTOREN WERKE AG
    • REIF KONRAD
    • F01L9/04H01F7/18H02K33/04
    • PROBLEM TO BE SOLVED: To provide an exciting method of an electromagnetic actuator, which shortens the exciting time of exciting current pulses and reduces the request output to the actuator by the shortening of the exciting time. SOLUTION: An armature 4d which acts on the change-over element resists the forces of return springs 2a and 2b, by making to flow alternately a current to two electromagnetic coils 4a and 4b to make a vibration motion between the coils 4a and 4b, the change-over element forms a vibration spring-mass system, together with the armature and the return springs and the coils 4a and 4b apply a prescribed frequency of an AC voltage to the spring-mass system for exciting this spring-mass system starting from the static state of the system, whereby the spring, the mass and the system are excited alternately. An almost sine-shaped AC voltage or an AC voltage similar to the AC voltage is applied to the coils 4a and 4b instead of the form of almost square curve of change for an AC voltage U with respect to time (t), which is hetherto general, and moreover the AC voltage is applied in the form of a changeable continuous voltage change curve or in the form of a changeable voltage change curve which is modulated in pulse width.