Magnetorheological damper with external electromagnet

Abstract

The invention discloses a magnetorheological damper with an external electromagnet. The magnetorheological damper consists of a working cylinder, a piston, a piston rod, an external sliding electromagnet, a bearing frame and a compensating air bag, wherein a shell of the external sliding electromagnet is cylindrical; at least two pieces of rectangular magnet steel are uniformly distributed and fixed on the inner circumference of the cylindrical shell; a pole shoe is fixed at the other end of each piece of rectangular magnet steel; an excitation coil and a magnetizing / demagnetizing coil are wound on each piece of rectangular magnet steel; the external sliding electromagnet is arranged on the outer circumference of the working cylinder; one end of the bearing frame is fixed with the external sliding electromagnet, and the other end of the bearing frame is fixed with the tail end of the piston rod; and when the piston rod drives the piston to move in the working cylinder, the external sliding electromagnet is driven to synchronously slide outside the working cylinder by the bearing frame, and the magnitude of exciting current entering the excitation coils of the rectangular magnet steel on the external sliding electromagnet is adjusted, so that the output damping force of the magnetorheological damper with the external electromagnet can be adjusted.

Description

technical field [0001] The invention belongs to a magnetorheological damper, in particular to an external electromagnet magnetorheological damper. Background technique [0002] The piston of ordinary single-rod magnetorheological damper usually adopts a dumbbell-shaped structure as a magnetic field generator, and the excitation coil is wound in the middle of the dumbbell-shaped piston. When this magnetorheological damper is working, the excitation coil in the working cylinder It will be adversely affected by the long-term repeated washing of the magnetorheological fluid on the excitation coil. The magnetic field strength in the gap between the cylinders is zero, and the viscosity of the magnetorheological fluid in the gap is the lowest and the damping force is small. The damping force of the magneto-rheological damper is small and it is difficult to ensure the normal operation of the system; although the ordinary permanent magnet magneto-rheological damper can generate a ce...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the fact that the excitation coil of the existing common single-rod magneto-rheological damper is easily affected by the erosion of the magneto-rheological fluid and the damping force is small when the excitation current is zero, and the damping of the existing permanent magnet-type magneto-rheological damper The lack of remote stepless adjustment of the force, the present invention proposes an external electromagnet magneto-rheological damper, the external sliding electromagnet of the external electromagnet magnetorheological damper can use the control power at any time through charging and demagnetization The coil is magnetized or demagnetized to make it reach a certain magnetic field strength. Therefore, the external sliding electromagnet can first reach the predetermined working magnetic field strength, and then adjust the control power output to the excitation coil on the external sliding electromagnet. The magnitude and direction of the current, that is, the direction and magnitude of the electromagnetic field generated by the excitation coil are consistent with or opposite to the magnetic field of the external sliding electromagnet, that is, by enhancing or weakening the magnetic field strength of the external sliding electromagnet to achieve the external electromagnet The purpose of controlling the output damping force of the magnetorheological damper, therefore, the external electromagnet magnetorheological damper has both the convenient control of the ordinary magnetorheological damper and the safety and energy saving of the permanent magnetorheological damper. advantage

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