Magnetic-liquid double suspension bearing(MLDSB)is a new type of suspension bearing based on electromagnetic suspension and supplemented by hydrostatic supporting.Without affecting the electromagnetic suspension force...Magnetic-liquid double suspension bearing(MLDSB)is a new type of suspension bearing based on electromagnetic suspension and supplemented by hydrostatic supporting.Without affecting the electromagnetic suspension force,the hydrostatic supporting effect is increased,and the real-time coupling of magnetic and liquid supporting can be realized.However,due to the high rotation speed,the rotor part produces eddy current loss,resulting in a large temperature rise and large ther-mal deformation,which makes the oil film thickness deviate from the initial design.The support and bearing characteristics are seriously affected.Therefore,this paper intends to explore the internal effects of eddy current loss of the rotor on the temperature rise and thermal deformation of MLDSB.Firstly,the 2D magnetic flow coupling mathematical model of MLDSB is established,and the eddy current loss distribution characteristics of the rotor are numerically simulated by Maxwell software.Secondly,the internal influence of mapping relationship of structural operating parameters such as input current,coil turns and rotor speed on rotor eddy current loss is revealed,and the changing trend of rotor eddy current loss under different design parameters is explored.Thirdly,the eddy cur-rent loss is loaded into the heat transfer finite element calculation model as a heat source,and the temperature rise of the rotor and its thermal deformation are simulated and analyzed,and the influ-ence of eddy current loss on rotor temperature rise and thermal deformation is revealed.Finally,the pressure-flow curve and the distribution law of the internal flow field are tested by the particle image velocimetry(PIV)system.The results show that eddy current loss increases linearly with the in-crease of coil current,coil turns and rotor speed.The effect of rotational speed on eddy current loss is much higher than that of coil current and coil turns.The maximum temperature rise,minimum temperature rise and maximum thermal deformation of the rotor increase with the increase 展开更多
为了在钢管磁粉探伤过程中寻求一种性能良好,成本较低的标准试片对探伤设备进行灵敏度校准,对A_130/100与A_230/100标准试片使用后设备的磁化电流、磁粉消耗、钢管退磁、设备故障率等方面进行了比较分析。结果表明,使用A_130/100型试片...为了在钢管磁粉探伤过程中寻求一种性能良好,成本较低的标准试片对探伤设备进行灵敏度校准,对A_130/100与A_230/100标准试片使用后设备的磁化电流、磁粉消耗、钢管退磁、设备故障率等方面进行了比较分析。结果表明,使用A_130/100型试片校准设备灵敏度不仅能够符合标准规定、满足探伤要求,而且所需设备磁化电流小、每班节约电能约28.87 k Wh;检测过程中,设备与钢管之间不易产生打火,检测结束后钢管易退磁、剩磁小,触头消耗少,设备故障率低,使用效果良好。展开更多
基金the Natural Science Foundation of Hebei Province(No.E2020203052)the S&T Program of Hebei(No.236Z1901G).
文摘Magnetic-liquid double suspension bearing(MLDSB)is a new type of suspension bearing based on electromagnetic suspension and supplemented by hydrostatic supporting.Without affecting the electromagnetic suspension force,the hydrostatic supporting effect is increased,and the real-time coupling of magnetic and liquid supporting can be realized.However,due to the high rotation speed,the rotor part produces eddy current loss,resulting in a large temperature rise and large ther-mal deformation,which makes the oil film thickness deviate from the initial design.The support and bearing characteristics are seriously affected.Therefore,this paper intends to explore the internal effects of eddy current loss of the rotor on the temperature rise and thermal deformation of MLDSB.Firstly,the 2D magnetic flow coupling mathematical model of MLDSB is established,and the eddy current loss distribution characteristics of the rotor are numerically simulated by Maxwell software.Secondly,the internal influence of mapping relationship of structural operating parameters such as input current,coil turns and rotor speed on rotor eddy current loss is revealed,and the changing trend of rotor eddy current loss under different design parameters is explored.Thirdly,the eddy cur-rent loss is loaded into the heat transfer finite element calculation model as a heat source,and the temperature rise of the rotor and its thermal deformation are simulated and analyzed,and the influ-ence of eddy current loss on rotor temperature rise and thermal deformation is revealed.Finally,the pressure-flow curve and the distribution law of the internal flow field are tested by the particle image velocimetry(PIV)system.The results show that eddy current loss increases linearly with the in-crease of coil current,coil turns and rotor speed.The effect of rotational speed on eddy current loss is much higher than that of coil current and coil turns.The maximum temperature rise,minimum temperature rise and maximum thermal deformation of the rotor increase with the increase
文摘为了在钢管磁粉探伤过程中寻求一种性能良好,成本较低的标准试片对探伤设备进行灵敏度校准,对A_130/100与A_230/100标准试片使用后设备的磁化电流、磁粉消耗、钢管退磁、设备故障率等方面进行了比较分析。结果表明,使用A_130/100型试片校准设备灵敏度不仅能够符合标准规定、满足探伤要求,而且所需设备磁化电流小、每班节约电能约28.87 k Wh;检测过程中,设备与钢管之间不易产生打火,检测结束后钢管易退磁、剩磁小,触头消耗少,设备故障率低,使用效果良好。
