Non-contact magnetic exciter for complex modal testing of rotating machinery

摘要

PURPOSE: A non-contact type electromagnet exciting apparatus for a revolving body complex mode is provided to measure an accurate transmitting force using a bidirectional excitation and a hole sensor. CONSTITUTION: A hole sensor(140b) is installed in the center of one-side end of a core, and a displacement measuring unit(130) is installed in a penetrating hole of a protrusion of an upper fixing block. The hole sensor(140b) measures a flux density generated between an electromagnet(120) and a revolving body. The displacement measuring unit(130) measures a pore between the revolving body and the electromagnet(120). A hole sensor signal adjuster(141) is connected with the hole sensor(140b) for converting the flux density measured from the hole sensor(140b) into a force signal and measuring a transmitting force. The displacement signal measured in the displacement measuring unit(130) is amplified through a displacement sensor amplifier, and the amplified displacement signal and the bidirectional transmitting force outputted from the hole sensor signal adjuster(141) are inputted to a signal analyzer(150).