Catalogue - Pi Type Ferrite Magnetostrictive Vibrators - TDK

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Magnetostriction Vibrators V2X Series

Conformity to RoHS Directive

Magnetostriction refers to changes in the dimension of a ferromagnetic material that occur in the direction of the magnetic field when it is magnetized. This phenomenon can be utilized to generate intense ultrasonic waves by giving a ferromagnetic material the appropriate shape and dimension.

TDK ferrite magnetostrictive vibrators, which are applications of this magnetostrictive phenomena and are based on ferrite material technologies, as well as machining technologies which TDK has accumulated over the years, deliver characteristics not found in metal magnetostrictive vibrators and have applications in a wide range of ultrasonic instruments.

FEATURES

• Due to high specific resistance, eddy current loss is very small.

• Electro-mechanical energy conversion efficiency is high(85 to 90%).

• As ferrite magnet is used, there is not necessary for DC bias.

• The magnet has excellent anticorrosive characteristics that permits to use in solvent such as acid, alkaline and others.

APPLICATIONS

Ultrasonic cleaning, sonar, ultrasonic machining.

PRODUCT IDENTIFICATION

V2 X n 28 (A)

W 72) W W 75T

(1) Material name

(2) Ferrite magnetostrication vibrator

(3) Type

(4) Resonant frequency(kHz)

(5) Shape's classified code

MATERIAL CHARACTERISTICS


Temperature dependence of resonant frequency*¹	Tk(1/°C)	17x 10^-5
Motional impedance*¹	Zmoo(£2)	180
Quality factor Q*¹	Qm	350
Electro-acoustic efficiency*¹	no(%)	90
Electro-mechanical coupling factor*¹	K(%)	18
Maximum input power(water load)*¹	W/cm²	10
Continuous input power(water load)*¹	W/cm²	3 to 5
Electrical resistivity*²	p(0 • cm)	1x 10³ min.
Density*²	d(g/m³)	5.1
Bending strength*²	rjd3(kg/mm²)	11 to 13
Thermal expansion coefficient*²	a	8x 10^-6/°C
Curie temperature*³	Tc(°C)	450

*¹ With 28kHz n type at 4AT *² With square pole specimen *³ With toroidal specimen

SHAPES AND DIMENSIONS

r—1/f


Part No.	Resonant	Dimensions(mm)							Weight
Part No.	frequency(kHz)	ab	c	de		f	^g	h	(g)
V2Xn20	19.5±0.4	18 114	132±3	26	51±1	25±0.5	14	13	555
V2Xn28(A)*	28.5±0.4	14 74	88±3	18	40±1	20±0.5	11	9	240
V2Xn40(A)	40.5±0.8	12 50	62±2	18	40±1	20±0.5	11	9	179
V2Xn50	50.5±0.8	12 37	49±2	18	40±1	20±0.5	11	9	146
V2Xn75(A)	75±1.6	6.5 26	32.5±2	12	27±1	13±0.5	7.7	6	40
V2Xn100	100±1.6	5 20	25±2	9	21±1	10±0.5	5.5	4.5	17

Appended to the product number is our control code.

denotes the ferrite magnet for DC bias.

Designed to be used by inserting the ferrite magnet between legs. RESONANT FREQUENCY DEVIATIONS

Unit:kHz


Frequency	Nominal resonant frequency
rank	20kHz	28kHz	40kHz	50kHz	75kHz	100kHz
1	19.10 to 19.20	28.10 to 28.20	39.70 to 39.90	49.70 to 49.90	73.40 to 73.80	98.40 to 98.80
2	19.20 to 19.30	28.20 to 28.30	39.90 to 40.10	49.90 to 50.10	73.80 to 74.20	98.80 to 99.20
3	19.30 to 19.40	28.30 to 28.40	40.10 to 40.30	50.10 to 50.30	74.20 to 74.60	99.20 to 99.60
4	19.40 to 19.50	28.40 to 28.50	40.30 to 40.50	50.30 to 50.50	74.60 to 75.00	99.60 to 100.00
5	19.50 to 19.60	28.50 to 28.60	40.50 to 40.70	50.50 to 50.70	75.00 to 75.40	100.00 to 100.40
6	19.60 to 19.70	28.60 to 28.70	40.70 to 40.90	50.70 to 50.90	75.40 to 75.80	100.40 to 100.80
7	19.70 to 19.80	28.70 to 28.80	40.90 to 41.10	50.90 to 51.10	75.80 to 76.20	100.80 to 101.20
8	19.80 to 19.90	28.80 to 28.90	41.10 to 41.30	51.10 to 51.30	76.20 to 76.60	101.20 to 101.60

• The resonant frequency deviation is color coded. When two or

• Please note that, unless stated otherwise, frequency ranks are

more units are used as a set, those having the same color should subject to change depending on production circumstances.

be combined.

Conformity to RoHS Directive: This means that, in conformity with EU Directive 2002/95/EC, lead, cadmium, mercury, hexavalent chromium, and specific bromine-based flame retardants, PBB and PBDE, have not been used, except for exempted applications.

• All specifications are subject to change without notice.

002-02 / 20080108 / e171

Pi Type Ferrite Magnetostrictive Vibrators - TDK - #1

Filter, Transformer, Ceramic filter, Ferrite magnet, Test chamber