Self-bearing Motor Research Articles

Radial position active control of double stator axial gap self-bearing motor for pediatric VAD

Radial position active control of double stator axial gap self-bearing motor for pediatric VAD

IPM型5軸制御セルフベアリングモータの小型化とコギングトルク特性改善に関する研究

5-DOF self-bearing motor possesses the functions of a motor, two radial active magnetic bearings (AMBs), and an axial AMB. It is possible to downsize the AMB system while still maintaining a high level of support performance. In a 5-DOF self-bearing motor, the IPM rotor generates bias fluxes in not only the radial direction but also in the axial and tilt directions without any side surface permanent magnets. However, cogging torques are inherently generates by the magnetic flux flow in a IPM rotor. The proposed flux recovery-type permanent magnets configuration was analyzed using the 3-dimensional finite element method. The results show a significant reduction of the cogging torques and an improvement to motor efficiency.

504 コンシクエントポール型5軸制御セルフベアリングモータの基本特性解析(OS5-(1),OS5 オーガナイズドセッション≪ライフサポートにおける工学技術≫)

Magnetic bearings can support rotating shafts without any contact and have been used in harsh conditions such as in cryogenic and clean environments. In this paper, consequent-pole type self-bearing motor is proposed. It is possible to control the rotor radial positions without the rotational magnetic field of the rotor. Moreover, use of the thick permanent magnets in the consequent pole rotor slots can be avoidable for its demagnetization. The three-dimensional magnetic field analysis using the finite element method carried out. In the results of proposed model2, it is confirmed that the motor torques, radial control forces, and axial control forces accomplish the target value of an artificial heart pump.

薄小型磁気浮上補助人工心臓における浮上インペラの受動安定軸の変動計測

We have developed a small, thin, maglev ventricular assist device (VAD), which can be implanted under the thorax muscle layer like a pacemaker. Radial position of a levitated impeller and its rotation are actively controlled by radial type self-bearing motor. An Axial position and tilt motion, stabilized passively with self-restoring characteristics of permanent magnets, are measured by using the three laser displacement sensors to evaluate the performance of the passive stability. Irregular motion of axial position and tilt angle of the levitated impeller caused by irregular hydrodynamic force are observed in higher flow rate condition and shut off condition. The impeller posture aligned in horizontally with increasing rotational speed due to the gyroscopic effect.

B205 ダブルステータ型アキシャルセルフベアリングモータを用いたクローズドインペラ型磁気浮上ポンプ(OS7 磁気浮上・磁気軸受の制御2)

B205 ダブルステータ型アキシャルセルフベアリングモータを用いたクローズドインペラ型磁気浮上ポンプ(OS7 磁気浮上・磁気軸受の制御2)

503 IPM型5軸制御セルフベアリングモータに関する研究(OS5-(1),OS5 オーガナイズドセッション≪ライフサポートにおける工学技術≫)

503 IPM型5軸制御セルフベアリングモータに関する研究(OS5-(1),OS5 オーガナイズドセッション≪ライフサポートにおける工学技術≫)

Analysis and Design of a 300-W 500 000-r/min Slotless Self-Bearing Permanent-Magnet Motor

Active magnetic bearings enable contactless operation and can therefore be used for supporting rotors spinning at high speeds. However, the rotational speed in conventional reluctance-force-based magnetic bearing topologies is limited, which is mainly due to high rotor losses and limited force control bandwidths. In this paper, a prototype of a self-bearing motor is presented, which overcomes several limitations of state-of-the-art high-speed magnetically levitated electric drive systems. Due to the employed magnetic bearing, the motor can be operated in high-purity or vacuum environments. An analytical mechanical and electrical bearing model is introduced and verified by measurements. Furthermore, a bearing inverter system is designed, and its controller performance is shown. Measurements of spinning levitated rotors up to speeds of 505 000 r/min verify the functionality of the overall system. To the authors' knowledge, this is the highest speed achieved by magnetically levitated electrical drive systems so far.

Development of a high-speed motor at extremely low temperatures with an axial self-bearing motor and a superconducting magnetic bearing

Superconducting technology has been significantly improved since the superconductor Y-Ba-Cu-O was discovered. This technology has been applied to many medical image-processing applications such as magnetoencephalogram (MEG) and magnetic resonance imaging (MRI). Because the superconducting phenomenon occurs at extremely low temperatures, liquid helium or liquid hydrogen is essential to obtain a low-temperature environment. In addition, it is well known that the decom- pression of the liquid helium creates superfluid helium. This phenomenon improves the performance of the superconducting devices. For that reason, a vacuum pump, which can be used at a cryostat, is required. In this paper, we propose a motor that has a small size and simple structure for use in the cryostat. The proposed motor con- sists of an axial self-bearing motor, superconducting magnetic bearings, and permanent-magnet repulsive-type passive magnetic bearings. The design of the motor and control method is introduced. The experimental results show that the proposed motor has a high possibility for high-speed rotation at extremely low temperatures.

1D13 Rotation Test of a Tilt-Controlling Axial Self-Bearing Motor with Superconducting Magnetic Bearing(The 12th International Conference on Motion and Vibration Control)

1D13 Rotation Test of a Tilt-Controlling Axial Self-Bearing Motor with Superconducting Magnetic Bearing(The 12th International Conference on Motion and Vibration Control)

5-DOF Control Miniaturized Self-bearing Motor for Paediatric Ventricular Assist Device

5-DOF Control Miniaturized Self-bearing Motor for Paediatric Ventricular Assist Device

Tilt control with axial self-bearing motor

Tilt control with axial self-bearing motor

Study on Outer Rotor Type 5-DOF Self-Bearing Motor

Study on Outer Rotor Type 5-DOF Self-Bearing Motor

Rotational angle estimation of Lorentz-type self-bearing motor using back-EMF

Rotational angle estimation of Lorentz-type self-bearing motor using back-EMF

12突極ラジアル型セルフベアリングモータの磁気支持特性の推定

12突極ラジアル型セルフベアリングモータの磁気支持特性の推定

연속적 역변환이 가능한 힘 모델을 이용한 환형권선 셀프베어링 BLDC 모터의 부상 제어기 구현

셀프베어링 모터는 하나의 자기 구동기(magnetic actuator)로 회전 구동과 자기부상을 동시에 구현한 전동기로 베어링리스모터 혹은 베어링 내장 모터로 불리기도 한다. 셀프베어링 모터에서 자기부상제어를 구현하기 위해 부상력과 제어전류 간의 모델을 역변환하여야 하는데, 힘-전류 간의 모델을 결정하는 변환행렬이 정방행렬이 아니며, 의사역행렬(pseudo-inverse) 또한 회전자의 각도에 따라 특이점을 가지게 된다. 본 논문에서는 힘-전류 모델에 제한조건을 추가하여 연속적 역변환이 가능한 새로운 방법을 제시하고, 역변환 행렬을 해석적으로 구하였다. 연속적 역변환을 이용한 부상제어기를 구현하여 안정적 부상제어가 이루어짐을 확인하였다. 힘-전류 모델에 추가한 제한조건으로 상전류의 총합이 0 을 유지하여 전류에 의한 고정자 자속밀도를 제거함으로써, 이전 연구에서의 자기포화 문제를 근본적으로 해결하였다.

B07 ホモポーラ型ハイブリッド5軸制御セルフベアリングモータのモータ基本特性(M-OS1-2:フライホイール・ベアリングレスモータ,M-OS1 磁気浮上・磁気軸受の制御,「海を越え,国を越え,世代を超えて!」)

An active magnetic bearing system can support a rotating shaft without any mechanical contact. Therefore it has been used such as an ultra-low temperature, a vacuum, and a clean environments. To realize the downsizing of the system and the high-speed rotation, 5-axis self-bearing motor has been proposed. In this paper, homopolar type hybrid 5-DOF self-bearing motor is proposed. The rotor consists of two rotors, two circular discs, and a permanent magnet. It possesses a motor, two radial magnetic bearings, and an axial magnetic bearing. Furthermore it is possible to control the rotor radial position without the information of the rotating angle. The analytical results show the feasibility of a compact and high reliable actuator for an artificial heart pump.

507 コンシクェントポール型セルフベアリングモータの基本特性解析(OS9 オーガナイズドセッション《ライフサポートによる光学技術》)

507 コンシクェントポール型セルフベアリングモータの基本特性解析(OS9 オーガナイズドセッション《ライフサポートによる光学技術》)

806 小型・高性能アウターロータ型5軸制御セルフベアリングモータの開発(OS5-2 オーガナイズドセッション《ライフサポートにおける工学技術》)

806 小型・高性能アウターロータ型5軸制御セルフベアリングモータの開発(OS5-2 オーガナイズドセッション《ライフサポートにおける工学技術》)

807 ホモポーラ型ハイブリッド5軸制御セルフベアリングモータの開発(OS5-2 オーガナイズドセッション《ライフサポートにおける工学技術》)

807 ホモポーラ型ハイブリッド5軸制御セルフベアリングモータの開発(OS5-2 オーガナイズドセッション《ライフサポートにおける工学技術》)

Study on Permanent Magnet Arrangement for IPM Type 5-DOF Self-Bearing Motor

The 5-DOF self-bearing motor possesses the functions of a motor, two radial AMBs, and an axial AMB. Therefore, it is possible to miniaturize the AMB system with maintaining high performance. In this paper, an interior permanent magnet (IPM) type 5-DOF self-bearing motor is proposed. The IPM rotor generates bias fluxes to not only the radial direction but also the overhanging stator direction without side surface permanent magnets. Optimum configuration of the permanent magnets is analyzed using 3 dimensional finite element method. The results show the feasibility of the more compact and highly-reliable 5-DOF self-bearing motor.