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A laminated piezo-electric device comprising a pole-like laminate formed by alternately laminating piezo-electric layers and electrode layers in the direction of height, and a pair of outer electrode plates formed on the different side surfaces of said pole-like laminate, said two electrode layers n

A laminated piezo-electric device comprising a pole-like laminate formed by alternately laminating piezo-electric layers and electrode layers in the direction of height, and a pair of outer electrode plates formed on the different side surfaces of said pole-like laminate, said two electrode layers neighboring each other with said the piezo-electric layer sandwiched therebetween being electrically connected at their side surfaces to the outer electrode plates which are different from each other, wherein flexible protruded electrically conducting terminals are provided on the side surfaces of said pole-like laminate on where the outer electrodes are arranged, said flexible protruded electrically conducting terminals extending along the side surfaces of the electrode layers and are capable of following the stretching and contraction of said pole-like laminate in the direction of height thereof, and the electrode layers being joined to said outer electrode plates via said protruded electrically conducting terminals. In this laminated piezo-electric device, the protruded electrically conducting terminals absorb the stress produced by the stretching and contraction of the pole-like laminate, and features excellent durability without causing the wires to be broken between the outer electrodes and the inner electrodes even when the piezo-electric device is continuously driven at a high electric field under a high pressure for extended periods of time.

대표청구항 ▼

A laminated piezo-electric device comprising a pole-like laminate formed by alternately laminating piezo-electric layers and electrode layers in the direction of height, and a pair of outer electrode plates formed on the different side surfaces of said pole-like laminate, said two electrode layers n

A laminated piezo-electric device comprising a pole-like laminate formed by alternately laminating piezo-electric layers and electrode layers in the direction of height, and a pair of outer electrode plates formed on the different side surfaces of said pole-like laminate, said two electrode layers neighboring each other with said the piezo-electric layer sandwiched therebetween being electrically connected at their side surfaces to the outer electrode plates which are different from each other, wherein flexible protruded electrically conducting terminals are provided on the side surfaces of said pole-like laminate on where the outer electrodes are arranged, said flexible protruded electrically conducting terminals extending along the side surfaces of the electrode layers and are capable of following the stretching and contraction of said pole-like laminate in the direction of height thereof, and the electrode layers being joined to said outer electrode plates via said protruded electrically conducting terminals. In this laminated piezo-electric device, the protruded electrically conducting terminals absorb the stress produced by the stretching and contraction of the pole-like laminate, and features excellent durability without causing the wires to be broken between the outer electrodes and the inner electrodes even when the piezo-electric device is continuously driven at a high electric field under a high pressure for extended periods of time. assembly of claim 1 wherein the magnet retention element includes a radially outer surface extending between the first and second sets of laminated pole pieces and an inner surface directed towards the magnet. 5. The rotor assembly of claim 4 further comprising a shim positioned between the inner surface of the magnet retention element and the magnet for preventing radial movement of the magnet during rotation of the rotor. 6. The rotor assembly of claim 1 wherein each set of laminated pole pieces includes a plurality of first pole pieces having a first radial thickness and a plurality of second pole pieces having a second radial thickness. 7. The rotor assembly of claim 6 wherein the plurality of first pole pieces of a corresponding set of laminated pole pieces are positioned adjacent each other to form a first stack and wherein the plurality of second pole pieces of the corresponding set of laminated pole pieces are positioned adjacent each other to form a second stack. 8. The rotor assembly of claim 6 wherein the first radial thickness is greater than the second radial thickness. 9. The rotor assembly of claim 1, wherein said rotor has a terminal end, said first set of laminated pole pieces having a radial thickness T are adjacent said terminal end and said second set of laminated pole pieces have a radial thickness T' wherein T' is greater than T. 10. The rotor assembly of claim 9, wherein said first and said second sets of laminated pole pieces have an inner edge contiguous with an outer surface of said corresponding lobe. 11. The rotor assembly of claim 1, wherein said first and second sets of laminated pole pieces have a leading and a trailing edge and a recess is provided within each of said edges. 12. The rotor assembly of claim 1, wherein said magnet has a trapezoidal shape. 13. A rotor assembly for an electromechanical machine, comprising: a rotor connectable to a shaft for rotational movement therewith, the rotor extending along an axis and having a plurality of circumferentially spaced lobes projecting radially therefrom; a plurality of ring assemblies supported on the rotor, each ring assembly comprising a plurality of circumferentially spaced poles supported on corresponding lobes and a magnet retention ring having a radially outer edge and including a backing plate having a plurality of cutouts therein for receiving corresponding lobes therethrough; a plurality of magnets circumferentially spaced about the rotor and extending through the ring assemblies, each magnet being generally parallel to the axis of the rotor and being disposed between corresponding pairs of poles of each ring assembly; and a plurality of circumferentially spaced magnet retention elements projecting from a first side of the backing plate, each magnet retention element extending between corresponding pairs of poles, wherein said magnet retention ring prevents radial movement of said plurality of magnets. 14. The rotor assembly of claim 13 wherein each magnet retention element of each magnet retention ring has a retaining bar projecting from a corresponding terminal end thereof and wherein each backing plate includes a second side having a plurality of circumferentially spaced retaining bar receipt cavities formed therein, each retaining bar receipt cavity adapted for receiving a corresponding retaining bar of an adjacent magnet retention ring in a mating relationship. 15. The rotor assembly of claim 13 wherein each of the poles of each ring assembly includes a plurality of laminated pole pieces. 16. The rotor assembly of claim 15 wherein the rotor includes first and second ends and wherein one of the plurality of ring assemblies is positioned adjacent the first end of the rotor. 17. The rotor assembly of claim 16 wherein the laminated pole pieces of each of the poles of the one of the plurality of ring assemblies positioned adjacent the first end of the rotor includes a plurality of first pole pieces having a first radial thickness