Ball-disk rotor gyroscope adaptive quick-start technique

Abstract

Rotating speed is a critical parameter affecting the performanceof rotor gyroscopes. Rotor gyroscopes must operate at the rated rotatingspeed. To shorten the start time of the ball-disk rotor gyroscope,this paper presents a new design of the drive system for a ball-diskrotor gyroscope. The drive system is monitored by a microcontroller.First, the microcontroller generates a sine pulse width modulationsignal to drive the permanent magnet rotor. Second, the position ofthe rotor is detected according to the back electromotive force inthe non-energized coil. Third, a piecewise closed-loop control algorithmis implemented to keep the angular acceleration of the rotor withinthe safe range automatically during the acceleration process and whenrunning at a constant speed. This control algorithm can avoid rotorstalling due to loss of steps. Experimental result shows that withthe help of adaptive quick-start technique, the start time of thedevice can be shortened by up to 36.6%.

Keywords

Rotor gyroscope / Magneticallydriven / Quick start / Piecewise algorithm / Closed-loop control

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