双分数槽潜油永磁电机磁热耦合分析

Magneto-thermal coupling analysis of double fractional slot submersible permanent magnet motor

针对潜油永磁电机温度过高导致定子绝缘层脱落和转子永磁体受热产生不可逆退磁问题,在定子外径不增大的情况下,提出一种特定空间角度的双分数槽集中绕组结构。首先,根据特殊的绕组结构利用有限元法对该电机模型不同时刻的磁势进行求解分析。其次,在二维瞬态场中分别得到电机空载和额定负载工况下的电磁特性。最后,利用电磁场和温度场结合的多场耦合法求解电机定子、转子、永磁体和线圈的温升。结果表明,在不改变定子外径的情况下双分数槽集中绕组结构能够有效降低电机整体温度,其中永磁体温升下降8.74%,线圈温升下降36.4%,证明了此结构设计的合理性。

This paper presents a problem of shedding of stator insulation layer and thermal demagnetization of rotor permanent magnet caused by high temperature of oil submersible permanent magnet motor,and a double fractional slot concentrated winding armature structure with a specific space angle is proposed under the stator dimeter is limited.First,the finite element method is used to solve and analyze the magnetic potential of the motor model at different times.Second,the electromagnetic characteristics under no-load and rated load conditions are obtained in the two-dimensional transient field.Finally,the temperature rise characteristics of the stator and rotor,permanent magnets and coils of the motor are solved by using the multi-field coupling method combining the electromagnetic field and the temperature field.The results show that the double fractional slot concentrated winding armature structure can effectively reduce the overall temperature of the motor,in which the temperature rise of the permanent magnet decreases by 8.74%,and the temperature rise of the coil decreases by 36.4%,which shows the rationality of this structure design.