Motion Control of a Two-Degree-of-Freedom Linear Resonant Actuator without a Mechanical Spring

Kim, Gyunam; Hirata, Katsuhiro

doi:10.3390/s20071954

Cited by 6 publications

(4 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…LRAs can be classified into single-axis degrees of freedom and multi-axis degrees of freedom [34]. Many studies have discussed the applications and control methods of multi-axis degree of freedom LRAs [35,36].…”

Section: Characteristics Of the Lramentioning

confidence: 99%

Linear Resonator Actuator-Constructed Wearable Haptic System with the Application of Converting Remote Grinding Force to Vibratory Sensation

Liu,

Kao,

Feng

2023

Actuators

View full text Add to dashboard Cite

This study developed a three-axis vibrational haptic wearable device (RCWS) utilizing Linear Resonant Actuators (LRAs) to simulate grinding vibrations. The implementation of RCWS is described in detail. By recording the normal force during manual grinding with a load cell and converting it into a series of PWM commands, the LRA on the RCWS was controlled in open-loop mode using these PWM commands. Three methods were tested for force-to-PWM conversion, two of which showed a linear correlation (>0.7) with raw data. In the correlation between PWM commands and generated acceleration, all three methods exhibited a high linearity of at least 0.85. This wearable RCWS offers a promising approach for users to experience the machining force from the versatile and critical remote machining process with a finger vibratory sensation.

show abstract

Section: Characteristics Of the Lramentioning

confidence: 99%

Linear Resonator Actuator-Constructed Wearable Haptic System with the Application of Converting Remote Grinding Force to Vibratory Sensation

Liu,

Kao,

Feng

2023

Actuators

View full text Add to dashboard Cite

show abstract

“…The aforementioned haptic actuators can successfully provide localized tactile patterns. However, most of them fail to provide a salient haptic sensation due to the limitations of their working mechanisms, such as small stroke, small travel length or slow speed [15,16]. Multiple studies have come up with solutions to resolve the issues while providing multi-DOF tactile sensations and keeping the end-effector light.…”

Section: Introductionmentioning

confidence: 99%

A 2-DOF Impact Actuator for Haptic Application

2022

View full text Add to dashboard Cite

The demand for realistic haptic feedback actuators has increased as mobile devices have increased in popularity. However, most current haptic actuators provide limited 1-DOF tactile sensations, such as vibrations. This paper presents a 2-DOF haptic impact actuator that can provide planar directional (e.g., x and y directional) and magnitude tactile cues to a user. We built an impact actuator that was designed to be of such a size that a user can grasp it with one hand. Multiple electromagnets of the actuator drive a permanent magnet to hit the actuator housing, creating an impact. For the control of the impact direction, we assumed the direction of a magnetic field vector at the centre of the actuator would follow that of a reference vector formed by voltage heading into the electromagnet array. The results of magnetic field measurements support our assumption by showing that the trend of the magnetic field vector coincided with that of the reference voltage vector. Furthermore, the measurement of the impact acceleration showed the trend that the impact direction follows the reference voltage vector.

show abstract

“…In [ 6 ], a speed estimation of a linear ultrasonic motor is used to avoid speed/position sensors. In [ 7 ], a motion control of a linear resonant actuator with two degrees of freedom is implemented without a position sensor. Another sensorless strategy for speed control of a permanent magnet synchronous motor is explained in [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

DC Voltage Sensorless Predictive Control of a High-Efficiency PFC Single-Phase Rectifier Based on the Versatile Buck-Boost Converter

González-Castaño

Restrepo

Sanz

et al. 2021

Sensors

View full text Add to dashboard Cite

Many electronic power distribution systems have strong needs for highly efficient AC-DC conversion that can be satisfied by using a buck-boost converter at the core of the power factor correction (PFC) stage. These converters can regulate the input voltage in a wide range with reduced efforts compared to other solutions. As a result, buck-boost converters could potentially improve the efficiency in applications requiring DC voltages lower than the peak grid voltage. This paper compares SEPIC, noninverting, and versatile buck-boost converters as PFC single-phase rectifiers. The converters are designed for an output voltage of 200 V and an rms input voltage of 220 V at 3.2 kW. The PFC uses an inner discrete-time predictive current control loop with an output voltage regulator based on a sensorless strategy. A PLECS thermal simulation is performed to obtain the power conversion efficiency results for the buck-boost converters considered. Thermal simulations show that the versatile buck-boost (VBB) converter, currently unexplored for this application, can provide higher power conversion efficiency than SEPIC and non-inverting buck-boost converters. Finally, a hardware-in-the-loop (HIL) real-time simulation for the VBB converter is performed using a PLECS RT Box 1 device. At the same time, the proposed controller is built and then flashed to a low-cost digital signal controller (DSC), which corresponds to the Texas Instruments LAUNCHXL-F28069M evaluation board. The HIL real-time results verify the correctness of the theoretical analysis and the effectiveness of the proposed architecture to operate with high power conversion efficiency and to regulate the DC output voltage without sensing it while the sinusoidal input current is perfectly in-phase with the grid voltage.

show abstract

Motion Control of a Two-Degree-of-Freedom Linear Resonant Actuator without a Mechanical Spring

Cited by 6 publications

References 16 publications

Linear Resonator Actuator-Constructed Wearable Haptic System with the Application of Converting Remote Grinding Force to Vibratory Sensation

Linear Resonator Actuator-Constructed Wearable Haptic System with the Application of Converting Remote Grinding Force to Vibratory Sensation

A 2-DOF Impact Actuator for Haptic Application

DC Voltage Sensorless Predictive Control of a High-Efficiency PFC Single-Phase Rectifier Based on the Versatile Buck-Boost Converter

Contact Info

Product

Resources

About