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Your search keyword '"Pyrhonen, Olli"' showing total 87 results
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87 results on '"Pyrhonen, Olli"'

4. Design and Manufacturing of a Modular Low-Voltage Multimegawatt High-Speed Solid-Rotor Induction Motor

Author

Kurvinen, Emil, primary, Di, Chong, additional, Petrov, Ilya, additional, Nerg, Janne, additional, Liukkonen, Olli, additional, Jastrzebski, Rafal Piotr, additional, Kepsu, Daria, additional, Jaatinen, Pekko, additional, Aarniovuori, Lassi, additional, Sikanen, Eerik, additional, Pyrhonen, Juha, additional, Sopanen, Jussi, additional, Pyrhonen, Olli, additional, Niemela, Markku, additional, and Kangasmaki, Toni, additional

Published
2021
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8. Limitation of the load angle in a direct-torque-controlled synchronous machine drive

Author

Luukko, Julius, Pyrhonen, Olli, Niemela, Markku, and Pyrhonen, Juha

Subjects
Torque -- Research, Business, Computers, Electronics, Electronics and electrical industries
Abstract

The basic direct torque control (DTC) principle is to rotate the flux linkage forward, if the torque must be increased, and reverse, if the forque must be decreased. The torque is, however, increased only up to a maximum torque of the machine, which corresponds to a load angle of about 90[degrees] in a synchronous machine. This paper presents a method to overcome the possible loss of synchronism when using DTC. This requires either that the rotor angle is measured or estimated. Both of these cases are considered. Simulation and laboratory results are presented to show the effectiveness of the presented method. Index Terms--Estimation, rotating machine stability, synchronous motor drives.

Published
2004

29. Influence of the drive and dc link generated disturbances on an AMB control system

Author

Jastrzebski, Rafal P., Hynynen, Katja, Alexey Smirnov, and Pyrhonen, Olli

Subjects
Active magnetic bearings, Rotating machines, Magnetic levitation, Drive train
Abstract

The work focuses on experimental and theoretical examination of the influence of the distortion signals generated by the inverter and the active magnetic bearing (AMB) dc link voltage on an AMB control system. These low-frequency disturbances may result in performance degradation or lead to an unstable system. The analysis and measurements are performed on an AMB system controlled by an H ∞ controller. The studied signals include positions and currents in 5DOF, AMB dc link voltage, drive currents, and acceleration of the stator frame.

Published
2012

45. Condition Monitoring of Wind Power Converters Using Heat Flux Sensor.

Author

Baygildina, Elvira, Smirnova, Liudmila, Juntunen, Raimo, Murashko, Kirill, Mityakov, Andrey V., Kuisma, Mikko, Pyrhonen, Olli, Peltoniemi, Pasi, Hynynen, Katja, Mityakov, Vladimir Y., and Sapozhnikov, Sergey Z.

Subjects
WIND power, POWER electronics, INSULATED gate bipolar transistors, HEAT flux, FAILURE analysis, FINITE element method
Abstract

The application of the gradient heat flux sensor as a failure and aging indicator of the power electronics was studied in this paper. Conducted experiments shown that the heat flux sensor attached to the insulated-gate bipolar transistor's (lGBT's) base plate can provide realtime heat flux monitoring. Condition monitoring (CM) model implemented in wind turbine based on online comparison of measured IGBT heat flux and expected power losses was proposed. The deviation of the measured heat flux from the expected power losses was detected during lGBT's package related failures. The maximum deviation of 30% was obtained from the module with broken bond wire. The lGBT's package related degradation mechanisms were modeled by the Finite Element Method (FEM) in order to validate experimental observations. The obtained results have shown that in order to accurately estimate the possible deviation of power losses of the degraded IGBT, the exact change in thermo-electric parameters of IGBT in different failure mechanisms, environmental conditions and operating temperatures should be taken into account. [ABSTRACT FROM AUTHOR]

Published
2016
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49. Magnetic Bearing Spindle Tool Tracking Through \mu -Synthesis Robust Control.

Author

Pesch, Alexander H., Smirnov, Alexander, Pyrhonen, Olli, and Sawicki, Jerzy T.

Abstract

A method is presented for tooltip tracking in active magnetic bearing (AMB) spindle applications. The proposed tool tracking approach uses control of the AMB air gap to achieve the desired tool position. A μ-synthesis-based controller is designed for the AMBs with the goal of robustly minimizing the difference between the tool reference and estimated tool position. In such a way, the model-based control approach concurrently addresses the tracking problem and the inability to directly measure real-time tool position in the presence of machining disturbances. To ensure the tractability of the control problem, a model of the desired tracking dynamics is included in the plant. The method is demonstrated on a high-speed AMB boring spindle. To confirm the tool tracking capability, characteristic part geometries are traced including stepped, tapered, and convex profiles. Tool tracking is demonstrated for the rotating AMB spindle in the range of 90 μm. Also, static and dynamic external loading is applied to the spindle tool location to confirm the disturbance rejection ability of the closed-loop system. [ABSTRACT FROM PUBLISHER]

Published
2015
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