ROTOR

• Main Authors: NISHIHAMA KAZUO, MITSUISHI TAKEO, TAKEDA TAKAHIRO, ABE ATSUSHI
• Format: Patent
• Language: English; Japanese
• Published: 06.04.2022
• Subjects: CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; DYNAMO-ELECTRIC MACHINES; ELECTRICITY; GENERATION

To provide a rotor for a cage induction motor that can suppress the drop in torque that occurs during starting while keeping the dimensions of a rotor conductor constant at the dimensional ratio of the rotor conductor.SOLUTION: In a rotor 5 having a rotor conductor 8, the rotor conductor includes a first part where the circumferential width of the rotor conductor decreases toward the inner circumference of the rotor conductor, and a second part that is continuous with the inner peripheral side of the first part and in which the width in the circumferential direction of the rotor conductor increases toward the inner peripheral side of the rotor conductor, and when a distance from the outer peripheral end of the rotor conductor to the inner peripheral end of the rotor conductor is h0, a distance from the outer peripheral end of the rotor conductor to the outer peripheral end of the first part is h1, a distance from the outer peripheral end of the rotor conductor to the inner peripheral end of the second part is h2, and a constant N is a constant calculated on the basis of the depth of an eddy current penetrating the rotor conductor at the rotational speed at which the torque drops during startup, and the rotor conductor satisfies a relationship of h1/h0<N<h2/h0.SELECTED DRAWING: Figure 1 【課題】回転子導体の寸法を、回転子導体の寸法比を一定値としたまま、始動中に生じるトルクの落ち込みを抑制できる、かご形誘導電動機の回転子を提供する。【解決手段】回転子導体８を有する回転子５であって、回転子導体は、回転子導体の周方向の幅が回転子導体の内周側に向かって小さくなる第１の部位と、第１の部位の内周側と連なって回転子導体の周方向の幅が回転子導体の内周側に向かって大きくなる第２の部位とを有し、回転子導体の外周側の端から回転子導体の内周側の端までの距離をｈ０、回転子導体の外周側の端から第１の部位の外周側の端までの距離をｈ１、回転子導体の外周側の端から第２の部位の内周側の端までの距離をｈ２とし、定数Ｎは、起動中にトルクの落ち込みが生じる回転速度において回転子導体に浸透する渦電流の深さに基づいて算出される定数である場合において、回転子導体は、ｈ１／ｈ０＜Ｎ＜ｈ２／ｈ０の関係を満たす回転子。【選択図】図１