Voice coil actuators (VCAs) are applied in a fast steering mirror (FSM), precision positioning platform, etc. These applications demand that the VCAs used are simple, inexpensive, reliable, and efficient. In this paper, we report a novel VCA with concentration flux-line structure. The VCA greatly reduces the magnet leakage and has less electromagnetic interference with other electronic devices. The output force sensitivity of the VCA is 4.17 N/A with a coil of 300 turns and the stroke is ±2.5 mm. Driven by this VCA, the mechanical scanning angle of the FSM can achieve ±4.9 deg when the scanning frequency is 100 Hz.
The laser scanning system of a lidar usually needs a laser scanner with characteristics such as fast linear scanning, small
size and small rotational inertia moment. Traditional laser scanners, such as galvanometer and rotating multi-faceted
mirror, are difficult to achieve fast linear scanning with low moment of inertia. In order to solve these problems, a
piezoelectric optical scanner based on novel piezoelectric actuator is designed in this paper. First of all, the scanner
system components based on self-learning feed-forward controller is introduced. Furthermore, the principle and method
of amending the scanner hysteresis loop are analyzed. Finally, one-dimensional linear scanning in a wide range of
frequencies using the control platform with the core of digital signal processor TMS320F2812 is achieved. The
experimental results show that the hysteresis characteristics have been restrained and scanning linear performance of the
piezoelectric optical scanner has been remarkably improved in low frequencies. In high frequencies, the nonlinearity of
triangle wave scanning is reduces by adding a notch filter circuit which restrained the structure resonance of the scanner.
The piezoelectric optical scanner also has other advantages such as large optical scanning angle, high first step
resonance frequency, small size and simple structure.
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