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 NumberBA3502BA4902BA4010BA5010BA6020
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
Cap. [1] 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:

1. Capacitance of both sides in parallel. This value should be used for calculating the required current in the three-wire or parallel configuration. Tolerance is +/-30%

Features

The BA Series are piezoelectric bimorph actuators poled in the parallel configuration. An insulated resin coating is applied to the external surfaces to protect the actuator and to eliminate electrical faults. The actuators can be wired in a three-wire or two-wire configuration as illustrated below.

Electrical Connections

Elec Conn BD150 Inv Mode med2

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%.

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 δp-p is the peak-to-peak displacement of the bender, and Vin 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

keypad_sm Calculate Power Bandwidth

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.

AmplifierApplicationsConfigurationVoltage
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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