# BA Series Bender Actuators

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.

### Specifications

 Order Code Deflection Force Dimensions Thickness Free Length Voltage AC Voltage Cap. Stiffness Res. Freq. Mass $AUD Buy Now BA3502 0.7 mm 0.08 N 35 x 2.5 mm 0.8 mm 28 mm +150V +/-37 V 18nF 220 N/m 230Hz 0.3 g$10 Buy Now BA4902 1.3 mm 0.07 N 49 x 2.1 mm 0.8 mm 42 mm +150 V +/-37 V 20nF 100 N/m 140Hz 0.4 g $10 Buy Now BA4010 1.1 mm 0.18 N 40 x 10 mm 0.8 mm 33 mm +150 V +/-37 V 110nF 327 N/m 250Hz 1.7 g$20 Buy Now BA5010 1.5 mm 0.3 N 50 x 10 mm 0.8 mm 43 mm +150 V +/-37 V 140nF 400 N/m 200Hz 2.1 g $26 Buy Now BA6020 2.6 mm 0.3 N 60 x 20 mm 0.8 mm 53 mm +150 V +/-37 V 320nF 230 N/m 60Hz 5 g$43 Buy Now

### Electrical Connection

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
$$\delta = \frac{V_{in} – 1.5}{3}\delta_{pp}$$

where $\delta_{pp}$ is the peak-to-peak displacement of the bender, and $V_{in}$ 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

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.

### Electrical Current Requirements

Power Bandwidth Calculator

The required current is $$I = C \frac{dV}{dt}$$ 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: $$I_p = 2 \pi f V_{p-p}$$ where $$V_{p-p}$$ is the peak-to-peak voltage. For a triangle wave, the required peak current is equal to: $$I_p = 2 C f V_{p-p}$$.

### Recommended Drivers

Other recommended drivers are listed below.

 Amplifier Application 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

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