Full Text Available
Note: Clicking the button above will open the full text document at the original institutional repository in a new window.
The development of a non-intrusive motor efficiency estimation technique
Thesis (PhD (Electrical Engineering))--University of Pretoria, 2016.
Saved in:
| Other Authors: | |
|---|---|
| Format: | Thesis |
| Language: | English |
| Published: |
2026
|
| Subjects: | |
| Tags: |
No Tags, Be the first to tag this record!
|
| _version_ | 1867613537095909376 |
|---|---|
| access_status_str | Open Access |
| author2 | Bansal, Ramesh C. |
| author_browse | Bansal, Ramesh C. |
| author_facet | Bansal, Ramesh C. |
| collection | Thesis |
| description | Thesis (PhD (Electrical Engineering))--University of Pretoria, 2016. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/110048 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:37:43.241Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2026 |
| publishDateRange | 2026 |
| publishDateSort | 2026 |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/110048 The development of a non-intrusive motor efficiency estimation technique Bansal, Ramesh C. dlamini.muzi@gmail.com Naidoo, R.M. Dlamini, Vusumuzi Induction motor efficiency estimation energy management online monitoring speed estimation vibration signature analysis motor management energy efficiency life-cycle costs supply power quality. Thesis (PhD (Electrical Engineering))--University of Pretoria, 2016. Knowing the efficiency of installed motor loads is essential for effective motor management. Efficiency data can be used in the identification of opportunities for improving energy efficiency by replacing inefficient motors with high-efficiency motors and making the motor-driven processes more efficient. Traditional methods for determining motor efficiency are inadequate, because they are highly intrusive and require costly plant downtime to implement. Existing techniques have no explicit way to identify and compensate for the effects of supply voltage-related power quality problems. In this work, a new technique for estimating the efficiency of in-service induction motors without process interruption is developed. The motor efficiency is estimated using an improved compensated slip method. Improvements are made to the slip torque relationship by adapting it to take into account errors introduced due to simplifying assumptions made in the classical induction motor model and limitations in the motor manufacturing process. The motor speed is accurately determined using a novel technique based on motor vibration signature analysis. The improved non-intrusive compensated slip motor efficiency estimation technique is further developed to allow for accurate performance under non-ideal supply voltage conditions. This technique is able to identify when there are prevailing supply voltage power quality problems and make the necessary adjustments to maintain an acceptable level of accuracy. The new technique is suitable for in-service motors, since the input data required can be measured at the motor terminals in a noninvasive manner with inexpensive transducers. The performance of the proposed technique was evaluated by carefully designed experiments. This allowed for the technique to be tested across all motor loading points from no load to full load. Four test motors were used to assess the accuracy and reliability of the new proposed technique as the motor size varied. Six of the less intrusive existing motor efficiency estimation techniques were also implemented to evaluate how the performance of the technique compares to that of existing techniques. The performance of the new efficiency estimation technique was found to be consistent across all motor loading points and did not vary considerably with a change in motor size. The proposed method of estimating motor efficiency is found to be accurate and practical to implement. A detailed analysis of the proposed technique’s sensitivity to variations in the supply voltage is presented. The performance of this technique was tested on motors under different load and supply voltage power quality conditions. The proposed motor efficiency estimation technique was found to produce accurate results, demonstrating its suitability as an effective tool for performing online energy audits for motors in practical power system supply voltage conditions. A comprehensive motor management strategy to reduce motor life-cycle costs, while increasing reliability, is presented. The strategy incorporates benefits that can be obtained from using the proposed in situ motor efficiency technique and a network of field sensors to provide real-time data on the condition and performance of motors in a plant. This allows for proactive decisions to be made to optimise plant energy consumption and improve availability. Electrical, Electronic and Computer Engineering PhD (Electrical Engineering) 2026-05-15T17:26:10Z 2026-05-15T17:26:10Z 16/07/25 2016 Thesis http://hdl.handle.net/2263/110048 en application/pdf |
| spellingShingle | Induction motor efficiency estimation energy management online monitoring speed estimation vibration signature analysis motor management energy efficiency life-cycle costs supply power quality. The development of a non-intrusive motor efficiency estimation technique |
| title | The development of a non-intrusive motor efficiency estimation technique |
| title_full | The development of a non-intrusive motor efficiency estimation technique |
| title_fullStr | The development of a non-intrusive motor efficiency estimation technique |
| title_full_unstemmed | The development of a non-intrusive motor efficiency estimation technique |
| title_short | The development of a non-intrusive motor efficiency estimation technique |
| title_sort | development of a non intrusive motor efficiency estimation technique |
| topic | Induction motor efficiency estimation energy management online monitoring speed estimation vibration signature analysis motor management energy efficiency life-cycle costs supply power quality. |
| url | http://hdl.handle.net/2263/110048 |