Patent ID: 11859686
Assignee: HARBIN ENGINEERING UNIVERSITY
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F | IPC F

Claim 0:
1. A method of electromagnetic force control of a magnetic disk type negative stiffness electromagnetic actuator, comprising the following steps:
step 1: according to a static bearing capacity, selecting a mechanical spring for providing positive stiffness of a vibration isolation system, and determining positive stiffness of the spring;
step 2: establishing an electromagnetic force expression under magnetic unsaturation, and determining an electromagnetic attraction force of an electromagnet;
step 3: establishing an electromagnetic force-displacement expression according to a symmetrical structure of a negative stiffness electromagnetic actuator under a condition of magnetic unsaturation, wherein the negative stiffness electromagnetic actuator comprises a first electromagnet and a second electromagnet which are symmetrical up and down and have the same size;
step 4: analyzing the electromagnetic force-displacement expression, and determining an expression of currents passing through a first coil of the first electromagnet and a second coil of the second electromagnet 7 with respect to structural parameters, a displacement and a magnitude of ideal constant value negative stiffness when the negative stiffness electromagnetic actuator takes the currents as input control variables;
step 5: establishing a vibration isolation system dynamic formula, and determining a vibration response according to the electromagnetic force-displacement expression of the negative stiffness electromagnetic actuator under ideal conditions; and
step 6: according to the vibration response and based on the expression of the currents with respect to the structural parameters, the displacement and the magnitude of the ideal constant value negative stiffness, determining a control current required for the negative stiffness electromagnetic actuator to meet a linear electromagnetic force-displacement relationship.