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TGM60-50-10L Datasheet(PDF) 6 Page - NEC |
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TGM60-50-10L Datasheet(HTML) 6 Page - NEC |
6 / 31 page 2010.03.19 9307PIEVOL04E ●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data. ●Please request for a specification sheet for detailed product data prior to the purchase. ●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog. 6 Piezoelectric Ceramics Vol.04 3) Relative When the ele electric field under a cons dielectric con defined by D ε0. This relat εT33/ε0when t electric field εT11/ε0 when t Calculation o Eq. 11. Stati using an all-p ( εT11/ε0 is als Where ε0 : Relat (8.854 t : Dista S : Electr C : Static E Where Kr : Electro vibrat K31: Electro length K33: Electro longit Kt : Electro ness v K15: Electro vibrati fr : Reson fa : Antires εε 33 0 T / = K Kt K = ⎛⎝ = ⎛⎝ = ⎛⎝ 2 2 2 33 15 π π π fr N Hz = [] 3 l fr N Hz = [] 2 l b) Lengthwise vibration The direction of vibration is perpendicular to the polarization direction; it is a simple vibration in one plane only. The coefficient of electromechanical coupling is known as K31. c) Longitudinal vibration The directions of polarization and vibration are the same, vibration is simple vibration. The electro- mechanical coupling coefficient is known as K33. Fig. 1-5 >3(a,b,D) D a b d) Thickness vibration Here, thickness is small compared with the area of the radiation plane; the effect of vibration is the same as that of longitudinal vibration. Generally, vibration is in two directions, and discrimination can be made between the two. The electromechanical coupling coefficient for this type of vibration is called Kt. e) Shear vibration The direction of vibration is the same as the polarization direction. Orientation of the drive field direction is perpendicular to it. A drive electrode is located perpendicular to the direction of polarization. The electromechanical coupling coefficient is expressed by K15. Where N1: Frequency constant of radial vibration (Hz-m) N2: Frequency constant of lengthwise vibration (Hz-m) N3 : Frequency constant of longitudinal vibration (Hz-m) N4 : Frequency constant of thickness vibration (Hz-m) N5 : Frequency constant shear vibration (Hz-m) D : Diameter of disc or column (m) : Length of plate, column, or cylinder (m) a,b: Width of square plate or column (Hz-m) t : Thickness of disc, square plate, or cylinder (m) D t t b Fig. 1-6 t 3(a,b,D) t Fig. 1-7 fr N t Hz = [] 4 fr N t Hz = [] 5 · · · · · · · · · · (3) · · · · · · · · · · (4) · · · · · · · · · · (5) t >4a a>t Fig. 1-4 · · · · · · · · · · (2) 2) Coefficient of electromechanical coupling The coefficient of electromechanical coupling repre- sents the mechanical energy accumulated in a ceramic or crystal; it is related to the total electrical input. This coefficient k can be calculated for each individual vibration mode by using the resonant (fr or fm) and antiresonant frequencies (fa or fn) and the applicable formula shown here: · · · · · · · · · · · · · · · · · · · · · (6) · · · · · · · · · · · · · · · · · · · · · · · · · (7) Kr fa fr fr K r rr r fa fr = − ⎛ ⎝ ⎞ ⎠ = − =⋅ 251 2 31 . tan π |
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