| 摘要 |
1,124,127. Electromagnetic hammers; stamping. G. M. BERGSTRAND, and P. A. TOVE. 20 May, 1966 [26 May, 1965], No. 22658/66. Headings B3H and B3Q. [Also in Divisions F2, G4, H1, H2 and H4] In a magnetostrictive reciprocating motor having adjacent magnetostrictive rods 6, 7 of materials which expand and contract in the presence of a magnetic field, arranged in rows, the rods at one end of a row rest on a support 16 and hook-shaped ends 8 of every other rod engage adjacent rods of the row so that the rod at the other end of each row transmits movement to a member 5. The rods may be arranged in a square or circular formation (Figs. 2 and 3, not shown). The motor is shown operating a spring-loaded valve 20 or may be used for stamping or embossing materials, e.g. metal. The coil 14 may be energized by A.C., D.C. or by a transistor oscillator (Fig. 5, not shown), in which case the parallel tuned circuit (29) forms the coil 14. This circuit may oscillate at the natural frequency of the mechanical system and if the motor is resiliently mounted this will increase the length of the stroke of the motor. The transistor may be fed from an A.C. supply via rectifiers. Magnetostrictive materials having an increase and decrease in length which may be used are an iron-cobalt alloy and cobalt ferrite. A friction reducing coating may be applied to the rods. |
