An Aerospace High Power Density Integrated Electric Actuator

Abstract

The invention discloses a high-power-density integrated electric actuator, and the electric actuator comprises a motor case, an end cover, a front supporting lug, a rear supporting lug, a front bearing, a rear bearing, a rear end cover, a motor stator assembly, a motor rotor assembly, a positioning sleeve, a ball screw, a linear displacement sensor and a rear supporting lug cover. A motor is an 8-pole 24-slot brushless DC motor, and the motor directly drives the ball screw to complete linear operation. A speed reducer mechanism is cancelled, thereby simplifying the system structure, and remarkably improving the power density and the transmission efficiency of the system. Through the reasonable design of a ball screw nut structure, the motor rotor assembly and the front and rear bearings are directly assembled on the nut, so that the integration level and the power density of the system are improved; the linear displacement sensor is arranged in the hollow ball screw rod, so that the size and the weight of the actuator are further reduced; the front and rear bearings are angular contact bearings, and are respectively arranged in bearing chambers of the motor case and the end cover,thereby achieving the supporting in the radial direction and the axial direction of the ball screw nut. The actuator is more compact in structure, is higher in power density and integration level, caneffectively reduce the loss between system transmission mechanisms, improves the overall efficiency of the system, and can effectively meet the performance requirements for high power density, high transmission efficiency and high reliability of the aerospace electric servo actuators.

Description

technical field [0001] The invention belongs to the technical field of aerospace electric steering gear, and in particular relates to an integrated electric actuator with high power density. Background technique [0002] With the continuous development of multi-electric / all-electric technology, electric actuators have the advantages of simple structure, high task reliability, good maintainability, and easy control, and can greatly simplify the structure of the system's secondary energy. Pneumatic actuators and hydraulic actuators are widely used in servo actuation fields such as rudder surface control and thrust vector control of modern aircraft. [0003] The electric actuator is composed of a motor, a reducer and a ball screw. The electric energy is converted into mechanical energy in the form of rotation through the motor, and the rotating mechanical motion is converted into a linear motion through the reducer and the ball screw. Its performance is good or bad. directly a...

AI Technical Summary

Problems solved by technology

[0004] However, the integration of traditional electric actuators is not high. The motor, reducer and ball screw are independent of each other. Low, it is difficult to meet the needs of modern aircraft miniaturization and high power density

In addition, the transmission efficiency of traditional electric actuators is not high, which further affects the improvement of the power density of the entire actuation system

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