Human–machine interaction (HMI) allows the transfer
of human
intent to the robot and the collection of feedback from the robot.
Human perception of the outside world is a direct response to human
brain training, but low-level perception movements of robots are more
complex than advanced reason. In the study, we designed a self-powered
electronic skin (SPES) based on a piezoelectric nanogenerator (PENG).
SPES shows a good piezoelectric effect and certain mechanical flexibility
and can realize gesture recognition and tracking by sensing external
pressure stimulation in HMI. Through the feedback control of the closed-loop
system, the equivalent behavior trigger of the real intelligent robotic
capacitive touch sensors (CATS) and SPES can be realized. SPES and
Robot Hall Rotary Position Sensor (HRPS) have small perceptual errors,
and remote signal feedback and behavior control of intelligent robots
are realized by wireless transmission equipment, which is a greater
advantage in a flexible environment. The proposed SPES tracking application
in the HMI has great potential in the future artificial intelligence
environment, the auxiliary equipment for people with disabilities,
and the human–machine cooperation in a flexible environment.
The harmonics of line to line voltage in two-stage matrix converter (TSMC) with fixed carrier frequency had discrete and high values and produced powerful electromagnetic interference (EMI). In this paper, chaotic carrier frequency modulation technique (CCFMT) was applied in TSMC for the first time to spread sideband range and suppress harmonic peak value. Although this technique could suppress EMI, it would increase the probability of narrow pulses. In order to improve reliability, the rectifier in the two-stage matrix converter uses PWM modulation with zero vector to extend the zero current commutation time, solves the narrow pulse problem, and simplifies the commutation process. At last, an experiment platform was designed and experimental results showed that harmonics of line to line voltage was efficiently suppressed.
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