General Solution of Levitation Control of a Permanent Magnet (PM)-Type Rotating Motor

Okada, Yohji; Ohishi, Tetsuo; Dejima, Kazutada

doi:10.1299/jsmec1993.38.538

Cited by 9 publications

(4 citation statements)

References 1 publication

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“…Bichsel, a Swiss researcher, carried out similar research in his doctoral course at ETH and compiled his study results on bearingless permanent magnet synchronous motors in his doctoral thesis in 1990 (55) . Subsequently, Okada et al clarified the relationship between the number of poles and the levitation force for permanent magnet synchronous motors (56) . In the 1990s, theoretical systems for bearingless drives were established on the basis of vector control theories, to which Chiba et al greatly contributed (57) .…”

Section: Bearingless Drive (Or Self-bearing Motor)mentioning

confidence: 99%

Reviews of Magnetic Bearing Development in Japan

Takahashi

2013

JSDD

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In the 1980s, active magnetic bearings attracted attention because of their benefits that include contact-free support, no lubrication and low energy consumption, and their industrial applications were extensively studied. In the 1990s, the latest control theories were applied to magnetic bearings, and bearingless drive technologies were established. Magnetic bearings were increasingly applied to industrial machinery and started to find use in artificial hearts. The number of researchers engaged in research on magnetic bearings rapidly increased in Japan, and many achievements were reported. Currently, however, less research is being carried out. In this article, Japan's contribution to the research and development of magnetic bearings is reviewed, particularly key works in the early days of magnetic bearings, from various aspects such as control, rotordynamics, self-sensing, bearingless drives, bearing loss, touchdown bearings, industrial applications, and standardization.

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Section: Bearingless Drive (Or Self-bearing Motor)mentioning

confidence: 99%

Reviews of Magnetic Bearing Development in Japan

Takahashi

2013

JSDD

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“…The axial position and inclination of the rotor-impeller are passively suspended by the strong magnetic attractive force in the radial direction between the stator and the rotor. The plus minus two-pole algorithm (Okada, et al, 1995) is adopted to levitate and rotate the rotor. Rotation coils of 50 turns and levitation coils of 80 turns are separately constructed in the each tooth of the stator.…”

Section: Introductionmentioning

confidence: 99%

Development of a small magnetic levitated centrifugal blood pump using a radial type self-bearing motor and axial position change of rotor-impeller by rotational magnetic field

Onuma

Masuzawa

Murakami

2017

Mechanical Engineering Journal

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A small magnetic levitated centrifugal blood pump using a radial type self-bearing motor has been developed for use as an implantable artificial heart. In order to realize an implantable blood pump for a small adult patient, miniaturization and high efficiency of the device are necessary. In this study, a radial type self-bearing motor which is small-diameter and thin was developed, and the axial position change of the rotor-impeller by the rotational magnetic field was proposed. Magnetic suspension characteristics and motor performance were compared the center axial position of the rotor with the displaced axial position of the rotor. Additionally, a magnetic levitated centrifugal blood pump using the self-bearing motor was developed, and pump performance and levitation performance were measured. The magnetic suspension performance in the radial direction was enough ability to control the radial position of the rotor. The magnetic suspension force in the radial direction decreased by displacing the axial position of the rotor. The passive stability performance in the axial direction was enough ability to suspend the rotor. The restoring force was possible to be varied by the rotation magnetic field. The motor performance decreased by shifting the phase angle of the rotational magnetic field from 90 degrees and displacing the axial position of the rotor. At the operating condition with a flow rate of 5 L/min against a pressure of 100 mm Hg, the oscillation amplitude in x, y, z direction were 0.014 mm, 0.014 mm and 0.039 mm, respectively. And, the total power consumption was 7.1 W. The developed magnetic levitated centrifugal blood pump has demonstrated sufficient levitation performance and low total power consumption. The average displacement in z direction of the rotor-impeller was possible to change by changing the phase angle of the rotational magnetic field. By decreasing the phase angle from 90 degrees in range of from 60 degrees to 90 degrees, it is possible to improve the levitation performance with just a little increases the total power consumption.

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“…In order to down size a maglev motor and to simplify the control system, several types of bearing-less motors (B M) have been proposed and researched, such as a radial-B M (3) (4) and an axial-B M (5) (6) . To increase passive stability, the rotor shape should be a disk shape for radial-B M or a long cylindrical shape for axial-B M. Consequently, permanent magnet (PM) size and stator surface area will be decreased due to these rotor shapes.…”

Section: Introductionmentioning

confidence: 99%

Proposal of a Permanent Magnet Hybrid-type Axial Magnetically Levitated Motor

et al. 2015

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A permanent magnet hybrid-type axial magnetically levitated motor is proposed in this paper. The motor consists of a spherical permanent magnet and an axial type bearingless motor with a tilt control function. The rotor has two permanent magnets on one side, and the motor stator has eight poles, which include eight concentrated windings. The operating principle was investigated through numerical analysis. It was verified that the proposed motor can control the translational motion, inclinational motion, and rotational motion independently. A test rig was fabricated to investigate the control performance. The time responses of each controlled axes were quick. In addition, stable levitated rotation was observed in each actively controlled axes up to 2000 min −1 .

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General Solution of Levitation Control of a Permanent Magnet (PM)-Type Rotating Motor

Cited by 9 publications

References 1 publication

Reviews of Magnetic Bearing Development in Japan

Reviews of Magnetic Bearing Development in Japan

Development of a small magnetic levitated centrifugal blood pump using a radial type self-bearing motor and axial position change of rotor-impeller by rotational magnetic field

Proposal of a Permanent Magnet Hybrid-type Axial Magnetically Levitated Motor

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