ROTARY ELECTRIC MACHINE

• Main Authors: YOKOTA SHINJI, OSAWA TSUKASA, UCHIDA TOMOHIRO, IKEDA KAZUMASA, MIZUNO MASAKI
• Format: Patent
• Language: English; Japanese
• Published: 28.12.2016
• Subjects: CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; DYNAMO-ELECTRIC MACHINES; ELECTRICITY; GENERATION

PROBLEM TO BE SOLVED: To reduce noise due to resonance of an outer rotor of an outer rotor type rotary electric machine.SOLUTION: When a different-rigidity part B1 including a through hole 611a is formed at a yoke plate part 611 of an outer rotor 6, the outer rotor 6 has two toric m-order modes in which antinode and a node have their positions fixed and shift in position from each other in a rotary electric machine rotating direction, and the toric m-order modes appear at two resonance frequencies. Thus, the antinode and node have their position fixed and shift in position from each other in the rotary electric machine rotating direction, part of electromagnetic force is not converted into vibration at each resonance frequency, and noise due to resonance of the outer rotor 6 is reduced. Further, when the different-rigidity part B1 including a through hole 611a is provided to the yoke plate part 611, the amount of magnetic flux passing through a yoke cylinder part does not decrease and generated torque of an electric motor does not decrease either.SELECTED DRAWING: Figure 2 【課題】アウターロータ式回転電機におけるアウターロータの共振による騒音を低減する。【解決手段】アウターロータ６のヨーク板部６１１に、貫通孔６１１ａを含む異剛性部Ｂ１を形成した場合、アウターロータ６の共振モードは、腹と節の位置が固定され且つ互いに腹と節の位置が回転電機回転方向にずれた２つの円環ｍ次モードとなり、その円環ｍ次モードは２つの共振周波数において現れる。このように、腹と節の位置が固定され且つ互いに腹と節の位置が回転電機回転方向にずれることにより、各々の共振周波数において電磁力の一部は振動に変換されなくなり、アウターロータ６の共振による騒音が低減される。また、貫通孔６１１ａを含む異剛性部Ｂ１をヨーク板部６１１に設けた場合は、ヨーク円筒部を通る磁束量は減少せず、電動機の発生トルクも減少しない。【選択図】図２