Integrated high-rotation-speed swash-plate-rotating motor pump

Abstract

The invention discloses an integrated high-rotation-speed swash-plate-rotating motor pump. The integrated high-rotation-speed swash-plate-rotating motor pump comprises a motor pump shell, a five-phase fault-tolerant permanent-magnet brushless direct current motor and a swash plate, wherein the five-phase fault-tolerant permanent-magnet brushless direct current motor and the swash plate are integrally installed in the motor pump shell. The motor pump shell is of a structure formed by connecting a large-end shell and a small-end shell; an end cover is installed on the end face of the large-end shell, sealing is carried out through a sealing ring, and a back pump body is installed on the end face of the small-end shell; a large-end cavity in the large-end shell and a small-end cavity in the small-end shell are communicated, the five-phase fault-tolerant permanent-magnet brushless direct current motor and a swash plate mechanism are installed in the large-end cavity and the small-end cavity respectively, the motor is coaxially connected with the swash plate mechanism, and the swash plate rotates to drive a flow distribution shaft with one end extending into the back pump body to synchronously rotate. According to the integrated high-rotation-speed swash-plate-rotating motor pump, a swash-plate-rotating axial plunger pump and the five-phase fault-tolerant permanent-magnet brushless direct current motor are axially connected in series and integrated into the same shell, the radial size is greatly reduced, rotational inertia is reduced, and the dynamic response speed is increased; reliability and fault-tolerant capability are high, power density is further increased, and the integrated high-rotation-speed swash-plate-rotating motor pump and a hydraulic cylinder can be easily integrated.

Description

technical field [0001] The invention relates to an integrated high-speed motor pump, in particular to an integrated high-speed swash plate rotary motor pump. Background technique [0002] The motor pump is a motor-driven pump, that is, the motor is directly connected to the hydraulic pump through a spline without a coupling. It is a widely used hydraulic power unit. Since the 1990s, due to the need to further reduce the size of the hydraulic power unit and increase the power density, an integrated motor pump that combines the motor and the pump has appeared. The integration is mainly reflected in the direct connection between the plunger pump and the motor shaft, sharing a housing, or further fuse the motor rotor and the hydraulic pump rotor (the hydraulic pump rotor is nested into the motor rotor). The integrated design not only greatly improves the power density of the hydraulic power unit, but also reduces the noise of the power source, reduces the possibility of oil lea...

AI Technical Summary

Problems solved by technology

[0003] The above-mentioned various schemes still have some deficiencies. Motor pumps using vane pumps or gear pumps (such as patent 200710305961.3 motor-embedded vane pumps) cannot be applied to high-pressure and high-speed working conditions, which limits the further improvement of power density; traditional forms Although the advanced axial piston pump can be applied to high-pressure and high-speed working conditions, due to the increase of oil absorption resistance and centrifugal force at high speeds, the possibility of overturning of moving parts such as cylinders and sliding shoes increases, and the rotor assembly Factors such as the large stirring loss of the oil in the stirring shell make the performance drop sharply at high speeds

[0004] The scheme of nesting the hydraulic pump rotor into the motor rotor has the characteristics of large radial size, large moment of inertia, and slow dynamic response. It is not suitable for integration with a hydraulic cylinder with a large axial size to form an electro-hydraulic actuator; asynchronous The induction motor is used as a motor pump drive motor, its power factor and power density are low, and its dynamic performance is poor; the ordinary permanent magnet synchronous motor has improved in power density and dynamic performance, but its fault tolerance performance is poor, and its reliability needs to be improved

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