2015 Fiscal Year Final Research Report
Development of a High-Precision Milling Machine Using a Five-DOF Controlled Bearingless Motor
| Project/Area Number |
26630024
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Production engineering/Processing studies
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| Research Institution | Shizuoka University |
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Principal Investigator |
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| Project Period (FY) |
2014-04-01 – 2016-03-31
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| Keywords | ベアリングレスモータ / 磁気軸受 / 磁気浮上 / 永久磁石モータ / トルク脈動 |
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| Outline of Final Research Achievements |
We focus on a five-degrees-of-freedom controlled magnetically suspended motor that has high-precision positioning and high-speed operation for a micro-end milling machine application. The electromagnetic disturbance, however, induced by the motor drive has influence on the positioning accuracy of the magnetic suspension. As a first step of this study, torque ripple reduction of the motor is investigated. We propose the unique winding arrangement for a 2-pole/12-slot permanent magnet motor to minimize torque ripple. The proposed model has primary (a turns) and secondary (b turns) windings in one slot. We theoretically demonstrate that the primary 6th harmonic component of the torque ripple is minimized when the winding ratio is b/a=0.37. We built a test motor. The measured torque ripple of the 6th harmonic component is significantly decreased to 0.25 % of the average torque.
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| Free Research Field |
精密機械システム
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