TY - GEN
T1 - Outer-rotor type permanent magnet reluctance generator with high power and low toque ripple
AU - Nakamura, Kenji
AU - Yoshida, Jun
AU - Ichinokura, Osamu
PY - 2010/12/1
Y1 - 2010/12/1
N2 - This paper presents an outer-rotor type permanent magnet reluctance generator (PMRG) for a small-scale wind-turbine and micro-hydroelectric power generation. First, this paper describes a PMRG using ferrite magnets. Residual magnetic flux density of the ferrite magnet is about three times lower than the rare-earth magnet, but the cost is about 10 times lower. It is demonstrated that the proposed PMRG with ferrite magnets has almost the same output power as that using rare-earth magnets by employing an outer-rotor structure. Next, a method for reducing torque ripple of the PMRG by stacking two rotors is proposed. One rotor is shifted by 180° in electrical angle from the other rotor. In addition, the rotor pole-tips are chamfered so that the toque waveform consists of only odd harmonics. In such a structure, the torque ripple can be almost cancelled. A trial two-stacked outer-rotor PMRG demonstrates that the maximum output power is 777 W, the efficiency at the point is 84.5%, and torque ripple is very low.
AB - This paper presents an outer-rotor type permanent magnet reluctance generator (PMRG) for a small-scale wind-turbine and micro-hydroelectric power generation. First, this paper describes a PMRG using ferrite magnets. Residual magnetic flux density of the ferrite magnet is about three times lower than the rare-earth magnet, but the cost is about 10 times lower. It is demonstrated that the proposed PMRG with ferrite magnets has almost the same output power as that using rare-earth magnets by employing an outer-rotor structure. Next, a method for reducing torque ripple of the PMRG by stacking two rotors is proposed. One rotor is shifted by 180° in electrical angle from the other rotor. In addition, the rotor pole-tips are chamfered so that the toque waveform consists of only odd harmonics. In such a structure, the torque ripple can be almost cancelled. A trial two-stacked outer-rotor PMRG demonstrates that the maximum output power is 777 W, the efficiency at the point is 84.5%, and torque ripple is very low.
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U2 - 10.1109/IECON.2010.5674933
DO - 10.1109/IECON.2010.5674933
M3 - Conference contribution
AN - SCOPUS:78751510132
SN - 9781424452262
T3 - IECON Proceedings (Industrial Electronics Conference)
SP - 2248
EP - 2251
BT - Proceedings - IECON 2010, 36th Annual Conference of the IEEE Industrial Electronics Society
T2 - 36th Annual Conference of the IEEE Industrial Electronics Society, IECON 2010
Y2 - 7 November 2010 through 10 November 2010
ER -