Concept of cost-effective power-assist wheelchair's electrical subsystem

Vitols, Kristaps; Podgornovs, Andrejs

doi:10.1109/aieee.2017.8270563

Cited by 8 publications

(5 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…An example of human-machine-human interaction from the medical field is a smart wheelchair with an assisting function. The concept of such an assistingpowered wheelchair is described in [8][9][10]. An assisting-powered wheelchair consists of an electrical drive (which consists of electrical machine and battery and electrical machine interface converter), battery pack, battery charger, control system, sensors, wheelchair control interface and also some kind of feedback to the user (that can be represented as visual, audible signals and also as haptic signals).…”

Section: Human-machine and Machine-human Interactionmentioning

confidence: 99%

Further Improvement of Customized Vibration Generator for Machine–Human Feedbacks with the Help of Resonant Networks

2021

View full text Add to dashboard Cite

Modern industrial, household and other equipment include sophisticated power mechanisms and complicated control solutions and require tighter human–machine–human interaction, forming the structures known as cyber–physical–human systems. Their significant parts are human–machine command links and machine–human feedbacks. Such systems are found in medicine, for example, in orthopedics, where they are important for operation and functional abilities of orthopedic devices—smart wheelchairs, verticalizers, prosthesis, rehabilitation units, etc. The mentioned feedbacks may be implemented based on the haptic perceptions that require vibration actuators. In orthopedics, such actuators can also be used for diagnostic purposes. This research brings forward the idea of the use of resonant operation of the driver of vibration actuator. The corresponding driver has been built and experimentally tested. It has been found that (1) the point of maximal current is actually defined by the resonant frequency, (2) change of the capacitance allows shifting of the point of maximal current output and (3) damping factors make the above-described effect less obvious. Further development of the proposed idea requires a comprehensive comparison of four-quadrant and two-quadrant schemes in this application and development of a real-time programmable capacitor pack consisting of several binary weighted capacitors and a commutating circuit, which is installable to these schemes.

show abstract

Section: Human-machine and Machine-human Interactionmentioning

confidence: 99%

Further Improvement of Customized Vibration Generator for Machine–Human Feedbacks with the Help of Resonant Networks

2021

View full text Add to dashboard Cite

show abstract

“…Market analysis [5] shows that several 18 650 shape models are available at capacities of 3 Ah (C cell ) and more. Typical nominal voltage is 3.6 V (U cell ).…”

Section: Battery Energy Storage Systemmentioning

confidence: 99%

“…Battery is one of the key points of personal mobility as it determines the driving range and price if high-cost high-performance battery technologies are used. While market analysis [5] show that lead-acid batteries are still the main energy storage solution for powered wheelchairs, the research is focusing on products which use state-of-art lithium-ion batteries [6,7]. The use of small capacity (< 4 Ah) cells gives a degree of freedom when designing a battery pack.…”

Section: Introductionmentioning

confidence: 99%

Archives of Electrical Engineering

Vitols,

Podgornovs

2020

View full text Add to dashboard Cite

Cells of a prototype powered wheelchair can be designed in various connections to provide different supply voltages which has impact on the efficiency of other wheelchair drive elements. The impact of cell configuration and resulting battery voltage on overall efficiency of power elements have been studied to determine the optimal configuration and voltage of the pack. A brief description of a battery energy storage system was given, and main requirements and variables were introduced to reveal the flexibility of the battery design. The efficiency versus supply voltage plots of a drive converter and battery charger were presented and discussed to find the optimal battery voltage. The motor design was analyzed from the fill factor perspective. The calculated efficiency parameters of all drive power elements were used to discuss and select an optimal battery cell configuration.

show abstract

“…The main idea of the proposed concept is integration of the power electrical equipment (scalable electrical motor-generator, its electronic driver, battery, its balancing-management system and charger), control and measurement hardware (sensor networks, motion reference devices, machine-human feedbacks and decision-making unit), as well as information technologies in a single versatile and expandable hardware platform. The concept has been briefly described in [8], its control subsystem-in [9], electrical subsystem-in [10], but more details about its scalable motor-generator-in [11]. Below, this concept is described briefly in order to introduce the electrical/mechanical requirements of the charger.…”

Section: Concept Of a Cost-effective Adoptable Power-assist Wheelchairmentioning

confidence: 99%

Modular Self-Balancing Battery Charger Concept for Cost-Effective Power-Assist Wheelchairs

et al. 2019

View full text Add to dashboard Cite

The paper deals with a power charger capable of quick simultaneous charging of several unevenly discharged batteries. The charger is designed for use in conjunction with a recently developed power-assist wheelchair composed of two armrest modules associated with wheels—each with its own motor, driver and battery. Uneven discharge of the batteries is very possible in this application. Taking into account the charging power and energy comparable with the most powerful household electrical devices, the refreshing of these batteries and integration of the entire power supply chain into the household grid become a topical and challenging task. Solving of this task requires a special charger that has several channels and can unevenly apply charging power to these channels. At the same time, the charger must not generate current harmonics or reactive power, must operate with good efficiency and satisfy size constraints. In the given research, a configuration of several interleaved isolated single-ended primary-inductor converters is studied. The synthesized mathematical model of the proposed charger provides data about its static and dynamic characteristics while its experimental investigation focuses on operation details (power losses, control features etc.). The obtained results prove that the proposed concept complies with the above-mentioned requirements and can be applied in the discussed application.

show abstract

Concept of cost-effective power-assist wheelchair's electrical subsystem

Cited by 8 publications

References 15 publications

Further Improvement of Customized Vibration Generator for Machine–Human Feedbacks with the Help of Resonant Networks

Further Improvement of Customized Vibration Generator for Machine–Human Feedbacks with the Help of Resonant Networks

Archives of Electrical Engineering

Modular Self-Balancing Battery Charger Concept for Cost-Effective Power-Assist Wheelchairs

Contact Info

Product

Resources

About