Search

Your search keyword '"Tomita, Mutuwo"' showing total 85 results
Start Over Author "Tomita, Mutuwo"
85 results on '"Tomita, Mutuwo"'

5. Sensorless control of permanent-magnet synchronous motors using online parameter identification based on system identification theory

Author

Ichikawa, Shinji, Tomita, Mutuwo, Doki, Shinji, and Okuma, Shigeru

Subjects
Parameter estimation -- Analysis, Business, Computers, Electronics, Electronics and electrical industries
Abstract

An online parameter identification method and sensorless control using identified parameters were realized in surface and interior permanent-magnet synchronous motors (SPMSMs and IPMSMs, respectively). As this method does not use rotor position or velocity to identify motor parameters, the identified parameters are not affected by position estimation error under sensorless control. The proposed method can be applied to all kinds of synchronous motors. The effectiveness of the proposed method was verified by experiments in both SPMSMs and IPMSMs. Index Terms--Extended electromotive force (EEMF), online parameter identification, permanent-magnet synchronous motor (PMSM), sensorless control.

Published
2006

6. An extended electromotive force model for sensorless control of interior permanent-magnet synchronous motors

Author

Chen, Zhiqian, Tomita, Mutuwo, Doki, Shinji, and Okuma, Shigeru

Subjects
Magnets, Permanent, Business, Computers, Electronics, Electronics and electrical industries
Abstract

During the last decade, many sensorless control methods have been proposed for surface permanent-magnet synchronous motors (SPMSMs) based on estimation of electromotive force (EMF) in which the motor's position information is contained. However, these methods cannot he applied to interior PMSMs (IPMSMs) directly, because the position information is contained in not only the EMF, but also the inductance of stators. In this paper, a new mathematical model for IPMSMs is proposed and an extended EMF is defined, which includes both position information from the EMF and the stator inductance. By using the newly proposed model, sensorless controls proposed for SPMSMs can easily be applied to IPMSMs. As an example, a disturbance observer is studied and the experimental results show that the proposed method on the proposed model is very effective. Index Terms--Disturbance observer, electromotive force (EMF), permanent-magnet synchronous motor (PMSM), sensorless control.

Published
2003

9. New sensorless control for brushless dc motors using disturbance observers and adaptive velocity estimations

Author

Tomita, Mutuwo, Senjyu, Tomonobu, Doki, Shinji, and Okuma, Shigeru

Subjects
Electric motors -- Research, Business, Computers, Electronics, Electronics and electrical industries
Abstract

A brushless dc motor has been represented by a nonlinear equation. Therefore, it has been difficult to apply the linear control theory to brushless dc motor systems. In this paper, to apply the linear control theory to brushless dc motor systems, we propose considering the nonlinear term of the equation as a disturbance and to realize a sensorless control of the brushless dc motor using both the disturbance observer and the adaptive velocity estimation. With proper pole locations of the disturbance observer, stability of the position estimation is guaranteed, and stability of the adaptive velocity estimation is also guaranteed by Popov's hyperstability theory. The experimental results show that the proposed method is very useful. Index Terms - Adaptive control, brushless rotating machines, disturbance observers, sensorless.

Published
1998

19. New Adaptive Sliding Observers for Position- and Velocity-Sensorless Controls of Brushless DC Motors

Author

Chen, Zhiqian, Tomita, Mutuwo, Doki, Shinji, and Okuma, Shigeru

Subjects
Power (Mechanics) -- Equipment and supplies, Motors -- Design and construction, Industrial electronics -- Equipment and supplies, Business, Computers, Electronics, Electronics and electrical industries
Abstract

A new adaptive sliding observer is proposed for position-and velocity-sensorless controls of a cylindrical brushless dc motor. Stability of the proposed observer is guaranteed easily, because it is based on a linear model of the motor. Sliding mode is applied for the current estimation. Under the sliding mode, the order of the observer's error equation is reduced. This makes the stability analysis easier, so that robust position and velocity estimations might be achieved by the pole assignment. Experimental results show that the proposed method is very effective. Index Terms--Adaptive sliding observer, brushless dc motor, sensorless control.

Published
2000

Catalog

Books, media, physical & digital resources
See catalog results