Abstract: A new kind of axial piston hydraulic motor pump is conceived, its structure and working principle is introduced briefly. ANSYS/Emag module is applied to computing the electro-magnetic field of the stator models with three different kinds of cooling channels. With further calculating and analyzing based on the numerical results, the electro-magnetic distribution and magnetic induction in oil clearance are obtained, and the comparison between them is also carried out. The research indicates that the stator with 12 rectangular cross section cooling channels has the strongest magnetic induction, the stator with 24 circular cross section cooling channels has the smallest magnetic induction, and the magnetic induction of the stator with 8 rectangular cross section cooling channels is between those of the above-mentioned two stators. The investigation provides the foundation for the structure design and optimization of the new kind of axial piston hydraulic motor pump.

Key words: ANSYS/Emag, Cooling channel, Electro-magnetic field, Hydraulic motor pump, Numerical calculation