Coil-free permanent-magnet-excited linear magnetostrictive actuator

Abstract

The invention discloses a coil-free permanent-magnet-excited linear magnetostrictive actuator which comprises an actuating assembly, a pre-pressure assembly, an excitation magnetic field assembly, a rotating assembly, a first connecting assembly, a second connecting assembly, an inner magnetic conductive drum and an outer magnetic conductive drum. The first connecting assembly is placed between the outer magnetic conductive drum and the excitation magnetic field assembly, the second connecting assembly is placed between the excitation magnetic field assembly and the inner magnetic conductive drum, the actuating assembly is placed in the inner magnetic conductive drum, and the pre-pressure assembly is connected to the actuating assembly in a sleeved mode. Bias magnetic fields and excitation magnetic fields appear alternately at definite frequency, definite-frequency telescopic movement of magnetostrictive rods is achieved, and vibration output at corresponding frequency is obtained through an output rod. The magnetic conductive effectively converts circumferential mechanical movement into axial telescopic movement, the design of a magnetic circuit open in two states enables torque needed in a rotation process to be very small so that actuation can be facilitated, and the temperature rise problem existing in magnetostrictive actuators generally is solved.

Description

technical field [0001] The invention relates to a driver, more particularly, to a linear magnetostrictive driver without coil permanent magnet excitation. The linear magnetostrictive driver has high reliability, high energy utilization rate, low power consumption, extremely low heat generation rate, and can change input and output motion forms. Background technique [0002] Magnetostrictive materials, as a new type of high-efficiency electric (magnetic) energy-mechanical (acoustic) energy conversion materials, have great application potential in the fields of aerospace, electronic power, information and communication and other intelligent structures. [0003] The magnetostrictive driver requires a certain strength of the driving magnetic field. In order to better utilize the properties of the material to obtain a linear output and avoid frequency doubling, it is usually necessary to provide a certain bias magnetic field. The bias magnetic field can be provided by means of a...

AI Technical Summary

Problems solved by technology

Analysis shows that the device uses insulating liquid to flow directly through the electromagnetic coil to take away heat. The insulation requirements of the entire cooling system are very strict, and it is difficult to implement.

In addition, improving heat dissipation efficiency does not fundamentally solve the heating problem, and the additional heat dissipation device is not conducive to the miniaturization and simplification of the device, which is difficult to achieve under actual working conditions

From an energy point of view, in addition to the high power consumption of the drive itself, the cooling system also consumes a lot of energy

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