开槽盘式磁力耦合器电磁转矩理论分析

Theoretical Analysis of Electromagnetic Torque of the Slotted-type Magnetic Couplers

对于开槽盘式磁力耦合器输出转矩的求解,提出了一种能够考虑磁路中各支路差异性以及相互作用的等效磁路法。导体转子采用的开槽形式,使得磁路中永磁体对应的气隙、导体和齿槽组成的支路并不相同,各支路的具体形式和内外转子相对位置有关;所提方法考虑各永磁体块所对应不同支路对电磁转矩的影响,并把整个磁路作为一个整体进行求解,考虑了各支路间的相互作用,提高了开槽盘式磁力耦合器输出转矩的计算精度。最后,利用所提方法对磁力耦合器不同滑差率、不同极弧系数和不同开槽比下的输出转矩进行了预测,并通过三维有限元分析和实验进行理论验证。经验证,所提方法能够满足工程应用的准确性要求。

A magnetic equivalent circuit method that can consider differences and interactions of each branch magnetic circuit was proposed for the solution of the output torque of slotted-type equivalent couplers.Due to the slotted form of the conductor rotor,the branches composed of the air gap,conductor,and tooth slot corresponding to the permanent magnet in the magnetic circuit are not the same.The specific form of each branch is related to the relative position of the inner and outer rotors.Since the conductor rotor adopts the slotted-type form,the branch magnetic circuits consist of air gap,conductor and cogging under the permanent magnet are different.The specific form of the magnetic circuit is related to the relative position of the inner and outer rotors.The magnetic equivalent circuit method was used to consider the influence of different branch magnetic circuits on the electromagnetic torque and it was solved as a whole taking into account the interaction between the branches,so as to improve the calculation accuracy of the output torque of slotted-type equivalent couplers.Finally,the proposed method was used to predict the output torque of the magnetic couplers under different slip rates,pole-arc/pole-pitch ratios and slotting ratios,and the theoretical verification was carried out by 3D finite element analysis and experiments.It is verified that the proposed method can meet the accuracy requirements of engineering applications.