The More Electric Aircraft (MEA) emphasizes the utilization of electrical power to replace hydraulic power. And the electromechanical actuation is one of the key technologies for MEA. There are a lot of advantages when electromechanical actuators are used in civil aircraft, such as increasing the efficiency and reducing the take-off weight of aircraft. Furthermore, it also can shorten the production cycle and decrease operation and maintenance costs. So a great many of programs and researches are sponsored and proposed by governments, institutes and industries incessantly. The review in this paper focuses on the researches and application of electromechanical actuation systems using for aerospace and civil aircrafts.

Traditional methods for solving the inverse kinematics of a hyper-redundant manipulator (HRM) can only plan the path of the end-effector with a complicated solving process, where obstacle avoidance is also not considered. To solve the above problems, a novel method for solving inverse kinematics of HRM is proposed in this paper: the variable dimension scaling method (VDSM), which can solve complex inverse kinematics while avoiding obstacles. Through this method, the path of the end-effector is scaled under a certain proportion and is adjusted depending on the position of the obstacle, which has good universality. The number of link angles changed is as small as possible in the process of achieving the end-effector moving along the desired path. With the redundancy of HRM, obstacle avoidance can be implemented in any environment by the proposed method. Through simulation and experiments in different environments, the above advantages of VDSM are verified.

Outer rotor motor is more suitable for unmanned ground vehicle (UGV) driving system in which the outer rotor motor is used as in-wheel motor. However, the outer rotor more usually suffers severe thermal condition as the limits of geometry or assembly. This paper analyzed the thermal performance of the outer rotor model using lumped parameter method. In lumped parameter method, the thermal resistance of different parts of the motor was calculated and the mean temperature rising was evaluated. A layered slot liner model was adopted in lumped parameter method and the thermal distributions were calculated. At last the accuracy of the method has been verified by compared to test results.

In this paper, a novel and precise contouring control strategy is designed based on the model of linear motor direct drive for X-Y table. This control strategy consists of two key parts-a precise Newton-based contouring error estimation (NCEE) and a chattering-free discrete-time sliding mode contouring error control (CDSM-CEC), and the details of designing the control strategy are stated. Specifically, NCEE is obtained according to the Newton-based extremum seeking, which is a dynamic method having rather good performance even when highly-curved reference contouring occurs. As for CDSM-CEC, it is developed from equivalent-control based sliding mode control, to reduce the ubiquitous chattering phenomenon in discrete-time sliding mode control. Experiments to track a circular contouring are implemented with comparison to prove the precise performance of the proposed contouring control strategy.

This paper presented a design method of permanent magnet synchronous motor (PMSM) of low-speed and high-torque which is applied in unmanned ground vehicle (UGV) drive systems. This method was based on genetic algorithm (GA). Firstly, at the theoretic analysis and calculation stage, the structures of stator lamination, rotor lamination and stator windings were designed; the size of permanent magnet and the length of air gap were calculated and the affection of air gap to flux waveform was discussed. Secondly, at the finite element method (FEM) analysis stage, the magnet field of PMSM was calculated in FEM, and the characteristic of magnet was discussed. At last, at the GA calculation stage, the efficiency of PMSM was set as the objective function and the coefficient was set, the experimented results were reported in the paper.

Slide mode variable structure control method is used for designing a digital controller of BLDC electric actuator in this paper. Firstly, the mathematic model of electric actuator is built according to the selected BLDC motor. Secondly, two slide mode algorithms, proportion switching algorithm and velocity trending law algorithm, are designed for the electric actuation system. Thirdly, we design a DSP digital controller using the sliding mode variable structure control algorithms. Fourthly, the system simulation and experiment are carried out. Based on results, we get the rule about the influence on the system performance by selecting different parameters. Experiments are made in the sequence and could well validate the results of simulation. Finally, we discuss the characteristics of the two algorithms, and summarize the method to design a slide mode variable structure controller for BLDC electric actuator.