Reglering av siktesplattform med asynkronmotor
(1998) In MSc ThesesDepartment of Automatic Control
- Abstract
- The task of this masters thesis is to investigate the properties of Natural Field Orientation, NFO, a new patented method for controlling the asynchronous motor. The intention is to see whether NFO would make it possible to, in the future, replace the expensive hydraulic motors that are being used in CelsiusTech Electronics' radar directors today with inexpensive hydraulic motors that are being used in CelsiusTech Electronics' radar directors today with inexpensive and robust asynchronous motors. These motors have proved to be difficult to control when operated at low speed. NFO claims to have solved this problem. The demands on the control properties for this kind of application are very high. <br><br> The assignment was subdivided into a... (More)
- The task of this masters thesis is to investigate the properties of Natural Field Orientation, NFO, a new patented method for controlling the asynchronous motor. The intention is to see whether NFO would make it possible to, in the future, replace the expensive hydraulic motors that are being used in CelsiusTech Electronics' radar directors today with inexpensive hydraulic motors that are being used in CelsiusTech Electronics' radar directors today with inexpensive and robust asynchronous motors. These motors have proved to be difficult to control when operated at low speed. NFO claims to have solved this problem. The demands on the control properties for this kind of application are very high. <br><br> The assignment was subdivided into a few parts: <br>1. Design and implement a scaled model of the radar director. <br>2. Assemble and configure required purchased drive Electronics. <br>3. Implement a control system using graphical programming in LabVIEW. <br>4. Analyse the control system, design and implement a controller. <br>5. Perform tests on the system and evaluate these. <br><br> It was verified that the NFO controlled asynchronous motor could be modelled as a DC-motor drive with high accuracy. This implicates simple analysis of an NFO controlled drive system. High accuracy can be achieved using a relatively simple controller architecture. Moreover, good speed control was achieved at low angular velocities. Contrary to many earlier control schemes for asynchronous motors, NFO managed to reject the jerky motion of the motor at low speed. <br> It is nor a problem to deliver a torque larger than the nominal torque of the motor using NFO. In this case approximately 150% of the nominal torque was delivered at zero speed. If a current loop had been included in the control system is seems like it would be possible to push this even further. This is in accordance with the theory of NFO. There are problems with electromagnetic interference in any switched power application. This must be considered when designing the drive system. (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/student-papers/record/8848579
- author
- Gamstedt, Jonas
- supervisor
- organization
- year
- 1998
- type
- H3 - Professional qualifications (4 Years - )
- subject
- publication/series
- MSc Theses
- report number
- TFRT-5605
- ISSN
- 0280-5316
- language
- Swedish
- id
- 8848579
- date added to LUP
- 2016-03-24 17:27:59
- date last changed
- 2016-03-24 17:27:59
@misc{8848579,
abstract = {{The task of this masters thesis is to investigate the properties of Natural Field Orientation, NFO, a new patented method for controlling the asynchronous motor. The intention is to see whether NFO would make it possible to, in the future, replace the expensive hydraulic motors that are being used in CelsiusTech Electronics' radar directors today with inexpensive hydraulic motors that are being used in CelsiusTech Electronics' radar directors today with inexpensive and robust asynchronous motors. These motors have proved to be difficult to control when operated at low speed. NFO claims to have solved this problem. The demands on the control properties for this kind of application are very high. <br><br> The assignment was subdivided into a few parts: <br>1. Design and implement a scaled model of the radar director. <br>2. Assemble and configure required purchased drive Electronics. <br>3. Implement a control system using graphical programming in LabVIEW. <br>4. Analyse the control system, design and implement a controller. <br>5. Perform tests on the system and evaluate these. <br><br> It was verified that the NFO controlled asynchronous motor could be modelled as a DC-motor drive with high accuracy. This implicates simple analysis of an NFO controlled drive system. High accuracy can be achieved using a relatively simple controller architecture. Moreover, good speed control was achieved at low angular velocities. Contrary to many earlier control schemes for asynchronous motors, NFO managed to reject the jerky motion of the motor at low speed. <br> It is nor a problem to deliver a torque larger than the nominal torque of the motor using NFO. In this case approximately 150% of the nominal torque was delivered at zero speed. If a current loop had been included in the control system is seems like it would be possible to push this even further. This is in accordance with the theory of NFO. There are problems with electromagnetic interference in any switched power application. This must be considered when designing the drive system.}},
author = {{Gamstedt, Jonas}},
issn = {{0280-5316}},
language = {{swe}},
note = {{Student Paper}},
series = {{MSc Theses}},
title = {{Reglering av siktesplattform med asynkronmotor}},
year = {{1998}},
}