Micromechatronics, Inc. (MMech)

Your development partner in electro-mechanical systems

BA Series Insulated Bimoprhs

Piezoelectric Insulated Bending Actuators

BA Series Bimorph

BA4902_smBA6020_sm

Specifications:

Part Number BA3502 BA4902 BA4010 BA5010 BA6020
Dimensions 35 x 2.5 mm 49 x 2.1 mm 40 x 10 mm 50 x 10 mm 60 x 20 mm
Thickness 0.80 mm 0.80 mm 0.80 mm 0.80 mm 0.80 mm
Free Length 28 mm 42 mm 33 mm 43 mm 53 mm
Deflection +/- 0.35 mm +/- 0.65 mm +/- 0.55 mm +/- 0.75 mm +/- 1.3 mm
Force 0.08 N 0.07 N 0.18 N 0.3 N 0.3 N
DC Voltage 0 to 150 V 0 to 150 V 0 to 150 V 0 to 150 V 0 to 150 V
AC Voltage +/- 37 V +/- 37 V +/- 37 V +/- 37 V +/- 37 V
Capacitance 18 nF 20 nF 110 nF 140 nF 320 nF
Stiffness 220 N/m 100 N/m 327 N/m 400 N/m 230 N/m
Reson Freq 230 Hz 140 Hz 250 Hz 200 Hz 60 Hz
Mass 0.3 g 0.4 g 1.7 g 2.1 g 5.0 g

NOTE: All of bimorps thicknesses are 0.8mm. The piezo layers are 0.3mm thick each with a 0.16um carbon fiber shim. The rest of the thickness is metalization and insulation. The maximum DC voltages for all the bimorph of the BA series is 150V.

Features

The three wire configuration requires a +150V amplifier with a +150V bias supply. In the two-wire (AC) configuration, the maximum deflection and force is reduced by 30%.

3 wire Bender Example lg

Electrical Connections

The recommended driver is a BD150 Module. The +150V bias voltage is achieved by configuring channel 2 in inverting mode and grounding the input. A 0V to +3V input is applied to input 1 to control the bender.

A zero volt input results in +150V across the top piezo layer and maximum upward deflection. A +3V input results in +150V across the bottom piezo layer and maximum downward deflection. The deflection δ can be represented by

Bender Deflection Formula

where is the peak-to-peak displacement of the bender, and has the range 0V to 3V.

Wires can be attached using conductive epoxy (Circuitworks CW2400) or standard solder and Rosin flux. After flux application, a one second contact with a 300C iron is recommended. The positive terminal is indicated by a red stripe.

Mounting Considerations

Bimorph actuators can be mounted with a soft clamp or bonded to a base using an adhesive such as Araldite. The longest life time is achieved when soft materials such as rubber are used at the clamping surface. The recommended clamping length is 2mm for for the BA3502 and 5mm for other sizes.

Lifetime

The expected lifetime for a 10% failure rate is 500,000 cycles with full-range deflection. The load force and deflection must be kept within specifications.

Electrical Current Requirements

The required current is I=C dV/dt, where I is the current, C is the effective capacitance, and dV/dt is the voltage rate-of-change. For a sine-wave, the required peak current is equal to:

Current formula sm

Where Vp-p is the peak-to-peak voltage. For a triangle wave, the required peak current is:

BA4510-eq2

Recommended Drivers

The recommended drivers and connection diagrams are listed below.

Amplifier Applications Configuration Voltage
BD150 General Purpose Three or Two Wire +150V
PD32-V0,140 Multi-channel Two or Three Wire +140V
PDu100b General Purpose Two Wire up to +/-100V
PDu100 Miniature Two Wire Up to +/-100V

Options/OEM Customization

    • Custom range and dimensions
    • Custom wiring arrangement/connectors

BA4902_wires_smaller

More Information

101 Innovation Blvd. Suite 308
State College, PA 16803, USA
Ph: (814)-861-5688
Fax: (814)-861-1418
contact@mmech.com
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