scholarly journals Evaluation of Position Controllability of Triaxial Active Control Magnetic Bearing Using Nonlinear Compensator

2021 ◽  
Vol 29 (1) ◽  
pp. 124-129
Author(s):  
Keigo NISHIDE ◽  
Akira HEYA ◽  
Katsuhiro HIRATA
Keyword(s):  
Active Control ◽  
Magnetic Bearing ◽  
Nonlinear Compensator

scholarly journals Dynamic characteristics of triaxial active control magnetic bearing with asymmetric structure

Open Physics ◽  
2018 ◽  
Vol 16 (1) ◽  
pp. 9-13 ◽  
Author(s):  
Atsushi Nakajima ◽  
Katsuhiro Hirata ◽  
Noboru Niguchi ◽  
Masayuki Kato
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Active Control ◽  
Dynamic Characteristics ◽  
Negative Pressure ◽  
Axial Direction ◽  
Magnetic Bearing ◽  
Magnetic Bearings ◽  
Asymmetric Structure ◽  
Element Analysis

Abstract Supporting forces of magnetic bearings are lower than those of mechanical bearings. In order to solve these problems, this paper proposes a new three-axis active control magnetic bearing (3-axis AMB) with an asymmetric structure where its rotor is attracted only in one axial direction due to a negative pressure of fluid. Our proposed 3-axis AMB can generate a large suspension force in one axial direction due to the asymmetric structure. The performances of our proposed 3-axis AMB are computed through 3-D finite element analysis.

The Dynamic Analysis of an Energy Storage Flywheel System With Hybrid Bearing Support

2009 ◽  
Vol 131 (5) ◽  
Author(s):  
Hongchang Wang ◽  
Shuyun Jiang ◽  
Zupei Shen
Keyword(s):  
Control System ◽  
Energy Storage ◽  
Active Control ◽  
High Speed ◽  
Magnetic Bearing ◽  
Magnetic Bearings ◽  
Squeeze Film ◽  
Transmitted Force ◽  
Hybrid Bearing ◽  
Active Control System

Active magnetic bearings and superconducting magnetic bearings were used on a high-speed flywheel energy storage system; however, their wide industrial acceptance is still a challenging task because of the complexity in designing the elaborate active control system and the difficulty in satisfying the cryogenic condition. A hybrid bearing consisting of a permanent magnetic bearing and a pivot jewel bearing is used as the support for the rotor of the energy storage flywheel system. It is simple and has a long working life without requiring maintenance or an active control system. The two squeeze film dampers are employed in the flywheel system to suppress the lateral vibration, to enhance the rotor leaning stability, and to reduce the transmitted forces. The dynamic equation of the flywheel with four degrees of complex freedom is built by means of the Lagrange equation. In order to improve accuracy, the finite element method is utilized to solve the Reynolds equation for the dynamic characteristics of the squeeze film damper. When the calculated unbalance responses are compared with the test responses, they indicate that the dynamics model is correct. Finally, the effect of the squeeze film gap on the transmitted force is analyzed, and the appropriate gap should be selected to cut the energy loss and to control vibration of the flywheel system.

Novel Structure of Three-Axis Active-Control-Type Magnetic Bearing for Reducing Rotor Iron Loss

2016 ◽  
Vol 52 (7) ◽  
pp. 1-4 ◽  
Author(s):  
Tatsuya Matsuzaki ◽  
Masatsugu Takemoto ◽  
Satoshi Ogasawara ◽  
Satoru Ota ◽  
Kazunobu Oi ◽  
...  
Keyword(s):  
Active Control ◽  
Magnetic Bearing ◽  
Iron Loss ◽  
Novel Structure

Towards fault-tolerant active control of rotor–magnetic bearing systems

2004 ◽  
Vol 12 (4) ◽  
pp. 491-501 ◽  
Author(s):  
Matthew O.T. Cole ◽  
Patrick S. Keogh ◽  
Mehmet N. Sahinkaya ◽  
Clifford R. Burrows
Keyword(s):  
Active Control ◽  
Fault Tolerant ◽  
Magnetic Bearing

Analysis and Control of a Flywheel Energy Storage System With a Hybrid Magnetic Bearing

1997 ◽  
Vol 119 (4) ◽  
pp. 650-656 ◽  
Author(s):  
J. D. Stienmier ◽  
S. C. Thielman ◽  
B. C. Fabien
Keyword(s):  
Energy Storage ◽  
Active Control ◽  
Permanent Magnets ◽  
Storage System ◽  
Equations Of Motion ◽  
Energy Storage System ◽  
Magnetic Bearing ◽  
Flywheel Energy Storage ◽  
Flywheel Energy Storage System ◽  
And Control

This article presents the design, dynamic analysis, and control of a flywheel energy storage system. At the heart of the system is a hybrid magnetic bearing. The bearing consists of ring and disk shaped permanent magnets, and a synthetic ruby sphere on a sapphire plate. The bearing is shown to be stable without active control. Equations of motion for the flywheel are derived in a sensor based coordinate system. The resulting equations are non-singular around the nominal operating condition and are feedback linearizable without the need for a coordinate transformation. A method of modeling rotor imbalance as a set of sinusoidal disturbances of magnitudes that do not depend on rotational speed is also presented. To reject large external disturbances active control is applied to the flywheel. Two nonlinear control laws are applied and are shown to improve the initial condition response of the inherently stable system.

Triaxial Active Control Magnetic Bearing with Asymmetric Structure

2021 ◽  
pp. 1-1
Author(s):  
Akira Heya ◽  
Katsuhiro Hirata ◽  
Noboru Niguchi ◽  
Atsushi Nakajima
Keyword(s):  
Active Control ◽  
Magnetic Bearing ◽  
Asymmetric Structure

Active Control of Gear Noise Using Magnetic Bearings for Actuation

2002 ◽  
Author(s):  
Marty Johnson ◽  
Mary Kasarda ◽  
Travis Bash
Keyword(s):  
Active Control ◽  
Magnetic Bearing ◽  
Magnetic Bearings ◽  
Rotating Shaft ◽  
Noise And Vibration ◽  
Gear Noise ◽  
Gear Mesh ◽  
Four Square ◽  
Control Forces ◽  
Substantial Control

This paper investigates experimentally the active control of gear noise and vibration using magnetic bearing actuators in a feedforward active control scheme. The dynamic forces caused by gear meshing can produce large noise and vibration signatures that can cause annoyance and also fatigue mechanical components. In this work active magnetic bearings were used as actuators to introduce control forces very close to the source of the disturbance i.e. directly onto the rotating shaft. The proximity of the actuators to the source ensures that substantial control can be achieved using a small number of actuators. A four-square gear rig was constructed in order to test the control methodology experimentally. A proximity sensor placed near the gear teeth was used as a reference sensor and used to drive the two magnetic bearing actuators through a time domain filtered X-LMS control system to minimize the outputs from both vibration and pressure error sensors. At one microphone over 20 dB of reduction in acoustic levels was achieved at the gear mesh frequency and an overall reduction of 6 dB was demonstrated at four microphones. It is also shown that gear mesh noise and sideband frequencies can be simultaneously controlled.

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