Higher Order Rotor Slot Harmonics for Rotor Speed & Position Estimation

2010-05-21
Keysan, Ozan
Ertan, Hulusi Bülent
Air-gap flux of all electrical machines contains harmonics. Some of these harmonics stem from rotor slotting of the machine. These harmonics can be utilized for control or diagnostic purposes. In the literature, rotor slot harmonics are mostly utilized for condition monitoring. There is also some research utilizing them for rotor speed estimation. However, it is observed that in the existing work spectral analysis techniques are employed which require long samples of data and in this from they are not suitable for vector control of induction motors. Accurate position information is vital for high performance vector control of induction motors. Furthermore using a sensor which requires some kind of modification on the motor is not desirable. A novel method has been proposed in this study that does not need any spectral estimation techniques. In this approach extracting the required information can be done within a typical control cycle of a vector controlled drive algorithm. Furthermore, any modification of the motor is not necessary. In this paper the proposed approach is presented. Experimental results illustrate that the position prediction accuracy of the approach is very high.

Suggestions

Real-Time Speed and Position Estimation Using Rotor Slot Harmonics
Keysan, Ozan; Ertan, Hulusi Bülent (2013-05-01)
It is well known that slotting harmonics exist in most of the electrical machines. So far, these harmonics are mainly identified using spectral estimation techniques. However, this approach requires long sampling and computation periods. In this study, a novel speed and position estimation method based on identification of rotor slot harmonics (RSH) that does not require any kind of spectral analysis is proposed. The required information is extracted by demodulating the information available in an external ...
Speed position estimation by demodulating rotor slot harmonics
Keysan, Ozan (2011-11-11)
It is well known that slotting harmonics exist in most of the electrical machines. These harmonics may supply valuable information for condition monitoring of bearings, windings or rotor bars. Utilization of these harmonics for rotor speed and position estimation is limited mainly due to long sampling periods required by spectral estimation techniques. In this study, a novel speed and position estimation method is proposed that does not need any kind of spectral estimation. In this approach extracting the r...
COMMUTATION ANGLE ANALYSIS OF A DOUBLE OUTPUT INDUCTION GENERATOR OPERATING IN SUB-SYNCHRONOUS AND SUPER-SYNCHRONOUS MODES
CADIRCI, I; ERMIS, M (1994-04-14)
A rigourous performance analysis of the double autpt indoction generator system with two controlled convaters hs been carried out including the effects of both the rotor side amvukr’s commutation an& and harmonics as well as the supply side converter’s harmonics. This is achieved by means of the hybrid induction machine model which allows for the changing states of conduction of the rotor side converter’s thyristors. The variations in overlapping angle of the rotor side convertex is obtained for a wide rang...
Axial flux permanent magnet machine with novel flat winding made of conductor sheet
Çakal, Gökhan; Keysan, Ozan; Department of Electrical and Electronics Engineering (2020-10-13)
This thesis proposes a novel winding topology, called flat winding, as an alternative to the conventional windings with stranded round wires for electric machines. It is made of a thin conductor sheet by industrial automation tools such as stamping press, laser, or water jet. Since these tools are widely used in the production of electric machines, the flat winding topology enjoys the advantage of the ease of manufacturing without significant modification on the production line. Superior current ratings, sh...
High Bandwidth Current Control via Nonlinear Compensation and GaN-based VSI
Yuruk, Huseyin; Keysan, Ozan; Ulutas, Bans (2019-01-01)
Nonlinearities in the voltage source inverter (VSI) such as dead time, switching time, delay time, voltage drops on the power switches, parasitic capacitances etc. are considered to be the main sources of the output voltage distortions. These distortions result in low order harmonics in the output current, which in turn increase core losses and create torque ripples. In particular, in the low speed and low torque applications the control performance and the stability of the system degrades substantially. Al...
Citation Formats
O. Keysan and H. B. Ertan, “Higher Order Rotor Slot Harmonics for Rotor Speed & Position Estimation,” 2010, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/30986.