Power system analysis and optimization for BioApps RoMicP® foot prosthesis / Mohammad Bilal Goolfee
A critical component of a motor-powered prosthesis is the power system that generates the required torque at the joint by converting chemical energy stored in batteries into electrical energy and finally mechanical torque. Prior studies focus mainly on the control system of prostheses and barely...
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| Format: | Thesis |
| Published: |
2021
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| Subjects: | |
| Online Access: | http://studentsrepo.um.edu.my/13429/1/Mohammad_Bilal_Goolfee.jpg http://studentsrepo.um.edu.my/13429/8/bilal.pdf http://studentsrepo.um.edu.my/13429/ |
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| Summary: | A critical component of a motor-powered prosthesis is the power system that generates
the required torque at the joint by converting chemical energy stored in batteries into
electrical energy and finally mechanical torque. Prior studies focus mainly on the control
system of prostheses and barely cover the power component. In order to achieve high
power efficiency in the RoMicP® prosthesis, this study investigates the required battery
specifications through calculations, as well as the power consumption of the LMG5200
inverter system and the feasibility of a multilevel inverter configuration using the
simulation model and software (available online) from the manufacturer, Texas
Instrument. The results showed that to fulfil the design requirement of weighing below
2.5kg, the battery size required is 10Ah at 24V and can power the prosthesis for 5k steps
per day. Moreover, using the LMG5200, an efficiency of 99.72% was achieved through
PWM switching with harmonic distortion of 2.15% for a three-phase output. Furthermore,
the proposed multi-level inverter design achieved an efficiency of 59.46% with harmonic
distortion of 0.82% and could therefore not be recommended for use in this case, although
it demonstrated that a multi-level system could generate cleaner output. In summary, this
project successfully investigated the battery requirements, power consumption and
efficiency of the simulated system, as well as the feasibility of a multi-level inverter
topology. Future studies should focus on investigating other multi-level topologies, and
increasing the number of levels, as well as different advanced switching techniques such
as Space Vector Modulation. |
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