The invention provides a direct-current brushless shaftless
frequency conversion wave making pump. The direct-current brushless shaftless
frequency conversion wave making pump comprises a hollow front end cover, a hollow back sand separating cover and a motor arranged between the front end cover and the back sand separating cover; the motor comprises a motor shell and an
impeller permanent magnet rotor, the motor shell is provided with a motor shell inner wall through hole in the axial direction, the
impeller permanent magnet rotor is rotationally arranged in the motor shell inner wall through hole, the
impeller permanent magnet rotor is provided with a rotor inner wall through hole in the axial direction, a water way for
water flow to pass through is formed by hollow cavities of the front end cover and the back sand separating cover and the rotor inner wall through hole, and blades for driving flowing of the
water flow are arranged in the rotor inner wall through hole in the circumferential direction; under driving of the blades, water in a
fish tank continuously passes through the water way formed by the hollow cavity of the back sand separating cover, the rotor inner wall through hole and the hollow cavity of the front end cover, and therefore water in the
fish tank sufficiently flows; and in addition, as a motor center shaft is not adopted in the structure, in the working process, vibration is small, the service life is long, generated
noise is small, and the pump is silent relatively.