JPH065394U - Drive device using giant magnetostrictive rod - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] A giant magnetostrictive material is a material that can expand and contract by applying a magnetic field and a bias magnetic field. The purpose of this invention is to provide a high-performance drive device with a simple structure at low cost by utilizing this giant magnetostrictive material to transmit expansion and contraction to a leaf spring that constitutes a tuning fork to amplify the expansion. [Structure] A cylindrical permanent magnet 3 fixed to a central piece, a coil 2 arranged on the inner circumference of the permanent magnet 3, and expandable by applying a magnetic field and a bias magnetic field to the inner circumference of the coil 2. A giant magnetostrictive rod 1 and a leaf spring 6 that is in contact with both ends of the giant magnetostrictive rod 1 and is fixed to a central piece 7. The giant magnetostrictive rod 1 repeatedly expands and contracts by applying an alternating current to the coil, This is a drive device using the giant magnetostrictive rod 1 characterized by vibrating the spring 6.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention transmits a vibration due to expansion and contraction caused by applying a magnetic field and a bias magnetic field to a giant magnetostrictive rod to a leaf spring that constitutes a tuning fork, amplifies this vibration by the resonance action of the tuning fork, and a drive device using this. Is.

[0002]

[Prior art]

 As a conventional driving device using vibration, there is a driving device using a permanent magnet 104, a center pole 102, a yoke 103, a magnetic circuit composed of the above three points, and a coil 100 as shown in FIG. It used the repulsive force that occurs when an alternating current is applied to the.

[0003]

[Problems to be solved by the device]

 However, in the case of the combination of the magnetic circuit and the coil, one drive device is required for each leaf spring in order to transmit the vibration to the leaf spring 105. In other words, two sets of magnetic circuit and coil are required, and since the coil is wound, the coil base 101 and the necessary coil base 101 are included, and the number of components is high, resulting in high cost.

In addition, since the gap between the center pole 102 and the yoke 103 is narrowed by improving the magnetic flux density in the magnetic circuit in order to improve the efficiency of the driving device, it is necessary to pay attention to the interference with the coil. Since the finish of this coil affects interference, the defective rate of the coil also rises, the precision required for the parts becomes strict, and it took time to assemble.

Further, since two coils having different finishes and weights are used, a slight difference in natural frequency occurs between the left and right plate panels. If there is a difference in natural frequency, the tuning fork structure will not be utilized and it will be inefficient as a drive unit, so adjustment work was required to match the natural frequencies of the left and right plate panels.

Therefore, an object of the present invention is to provide a low-cost drive device by using a giant magnetostrictive rod to reduce the number of constituent parts, simplify assembly, and eliminate adjustment work. Is.

[0007]

[Means for solving the problem]

 In order to achieve the above object, the present invention provides a cylindrical permanent magnet fixed to a central piece, a coil arranged on the inner circumference of the permanent magnet, and a magnetic field and bias on the inner circumference of the coil. It consists of a giant magnetostrictive rod that can be expanded and contracted by applying a magnetic field, and a leaf spring that is in contact with both ends of this giant magnetostrictive rod and is fixed to the center piece. The drive device is characterized in that the leaf spring is vibrated repeatedly by repeating expansion and contraction.

[0008]

[Action]

 By applying a magnetic field and a bias magnetic field from the outside, the vibration of the expandable and contractible giant magnetostrictive rod is transmitted to the left and right by contacting both ends of the giant magnetostrictive rod to the leaf spring that constitutes the tuning fork fixed to the center piece. The same vibration can be applied to the leaf spring of. This reduces the number of components and eliminates the need to adjust the natural frequency.

[0009]

【Example】

 An embodiment in which the driving device of the present invention is used in a pump will be described below with reference to FIGS. 1 and 2. FIG. 1 shows a main part of a drive device according to the present invention, and diaphragm pumps driven by vibration, which are well-known in the related art and are shown by P in the figure, are arranged at both upper and left ends of a leaf spring.

A tubular permanent magnet 3 is laterally fixed to the lower portion of the upright central piece 7 that constitutes the pump. The coil 2 is arranged on the inner circumference of the permanent magnet 3. The giant magnetostrictive rod 1 is inserted in the inner circumference of the coil in a state of being movable in the axial direction. Both ends of the giant magnetostrictive rod 1 are in contact with the pressers 5A and 5B. The pressers 5A and 5B are screwed on both sides of a leaf spring 6A fixed from the lower part of the central piece 7. Further, the leaf spring is provided with tuning fork portions 6A and 6B rising from the thin portions 4A and 4B to form a tuning fork.

A magnetic field is applied from the permanent magnet 3 to the giant magnetostrictive rod 1, and a bias magnetic field is applied to the coil 2 by applying an alternating current to the coil 2, so that the giant magnetostrictive rod 1 repeatedly vibrates and expands. This vibration is transmitted to the leaf spring by the pressers 5A and 5B that are in contact with both ends of the giant magnetostrictive rod 1. Then, this vibration is amplified by the resonance action of the tuning fork formed by the tuning fork portions 6A and 6B of the leaf spring 6, and the amplified vibration is generated by the diaphragm pump of the related art which is driven by the vibration indicated by P in the figure. It is transmitted.

In the above embodiment, the permanent magnet 3 is used to give a magnetic field, but instead of this, a coil may be arranged and a direct current may be flowed to obtain the same effect.

[0013]

[Effect of device]

 According to the present invention, by applying a magnetic field and a bias magnetic field from the outside, the vibration of an expandable and contractible giant magnetostrictive rod is brought into contact with both ends of the giant magnetostrictive rod, and a leaf spring constituting a tuning fork fixed to the central piece. The same vibration can be applied to the left and right leaf springs by one giant magnetostrictive rod. Therefore, the structure is simple, the number of components is small, and the adjustment work for adjusting the inherent frequency is not required, so that a high-performance drive device can be provided at low cost.

[Brief description of drawings]

FIG. 1 is a partially sectional front view showing an embodiment of the present invention.

FIG. 2 is a partially cutaway perspective view of a main part of the present invention.

FIG. 3 is a front view, partly in cross section, showing a drive device of the related art.

[Explanation of symbols]

 1 giant magnetostrictive rod 2 coil 3 permanent magnet 6 leaf spring 7 center piece

Claims (1)

[Scope of utility model registration request] 1. A cylindrical permanent magnet fixed to a central piece,
A coil disposed on the inner circumference of the permanent magnet; a giant magnetostrictive rod in which the amount of change in the magnetic field is proportional to the amount of change in dimension by applying a magnetic field and a bias magnetic field to the inner circumference of the coil; It consists of a leaf spring that is in contact with both ends of the magnetostrictive rod and is fixed to the center piece.By applying an alternating current to the coil, a bias magnetic field is applied, and the giant magnetostrictive rod repeatedly expands and contracts, giving vibration to the leaf spring. Drive device using the characteristic giant magnetostrictive rod.