... low noise, little vibration. Series Three-Phase Asynchronous Motors Y Specifications:1) Frame sizes: 250 2)Rated power: ... 8) EFF: EFF3, EFF2, EFF19) Poles: 2, 4, 6, 8,1010) Cooling method: IC411 (total-enclosed fan-cooled ... IMB3,IMB5,IMB35,IMB14,IMB3412) Operating mode: S113) Connection: "Y" type for 3kW and downwards, "D" type for 4kW ... customers' requirements Series three-phase asynchronous motor Y