Rapid Revolution Speed Control of the Brushless DC Motor for Automotive LIDAR Applications

Hironobu AKITA  Tsunenobu KIMOTO  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E103-C   No.6   pp.324-331
Publication Date: 2020/06/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.2019ECP5030
Type of Manuscript: PAPER
Category: Storage Technology
Keyword: 
pre-emphasis,  digital signal processing,  brushless DC motor,  vector control,  LIDAR,  

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Summary: 
A laser imaging detection and ranging (LIDAR) is one of the key sensors for autonomous driving. In order to improve its performance of the measurable distance, especially toward the front-side direction of the vehicle, this paper presents rapid revolution speed control of a brushless DC (BLDC) motor with a cyclostationary command signal. This enables the increase of the signal integration time for the designated direction, and thus improves the signal-to-noise ratio (SNR), while maintaining the averaged revolution speed. We propose the use of pre-emphasis circuits to accelerate and decelerate the revolution speed of the motor rapidly, by modifying the command signal so as to enhance the transition of the speed. The adaptive signal processing can adjust coefficients of the pre-emphasis filter automatically, so that it can compensate for the decayed response of the motor and its controller. Experiments with a 20-W BLDC motor prove that the proposed technique can achieve the actual revolution speed output to track the designated speed profile ranging from 600 to 1400 revolutions per minute (rpm) during one turn.