Advanced Materials Research Vols. 694-697

Abstract: In permanent magnet spherical motor control system, in order to obtain control current of the stator winding, it is required to solve the generalized inverse of the torque matrix of high dimension, which increases the computational burden of the control system. To solve this problem, the torque-sharing strategy of double-pole structure of PMSM was discussed. The target torque was decomposed into the rotation torque and the tilting torque through comparing the torque component of different stator windings. The set of control winding is divided. Further, according to the torque characteristics of a collection of internal stator winding and rotor position, an energizing strategy of the windings was developed, and the rotation and tilt torque control matrix were obtained, and two dimensional reduction matrixes reduced the computational burden. On this basis, the dynamics model and electrical model of PMSM were established, and the control system consisted of position loop and current loop. Control torque was obtained by the calculation of the torque method, and control current was obtained by torque-sharing strategy. Simulation results show that the system is able to achieve independent control of rotation and tilt and track the desired trajectory.

Abstract: Nonlinearity of return spring and friction makes the response characteristics of electronic throttle valve difficult to be promoted. In mainly consideration of calls for response rate and dynamic error, we designed the controller which adopting feed-forward control (FFC) and self-tuning fuzzy-PID as feed-back control (FBC) , a simplified electronic throttle model is also used to decrease computation time. As test for the controller, off-line simulation and Rapid Control Prototyping (RCP) technique are both taken. Via substantial measurements and continuous modulation the designment demonstrated excellent behavior.

Abstract: The multi-phase inverter modulation and control method is a hotspot of multiphase systems. There is no general space vector modulation available due to the inherent difficulty in synthesizing more than one independent space vector simultaneously in different d-p planes. This paper established the distribution model of five-phase inverter space vector from a novel perspective of magnetic motive force (MMF) equivalence. And then a multi-dimensional SVPMW method applicable to the non-sinusoidal voltage output was proposed based on the obtained space vector distribution laws. The proposed multi-dimensional SVPWM method effectively improves the fundamental modulation range and is suitable for five-phase inverter non-sinusoidal modulation.

Abstract: This paper first to the excavator bucket rod of hydraulic circuit based on the establishment of basic hydraulic components of the mathematical model, using the Simulink simulation software to build the overall hydraulic circuit simulation model; according to the actual situation of module parameters to the appropriate value, the complex and changeable load is simplified into four different operating conditions, by inputting different signals to simulate different operating condition simulation, finally through the study of the parameters on the dynamic characteristics of hydraulic system of excavator working device effects, the results of the simulation analysis, put forward the corresponding improvement measure.

Abstract: The winding inductance is an important parameter to analyze the characters of the slotless PM motor. In this paper an analytical energy method is introduced. By the method, the conductor inductance in the slotless motor can be figured out. Furthermore, an analysis method of the end winding inductance is presented in this paper. The calculation results are identical with the results of FEM and the actual measured value. It proves the calculation method of winding inductance in slotless motor is valid.

Abstract: The emission testing equipment fixed on ground stationary vehicle can’t be used in moving vehicle, the question is that the radial size of the eddy current retarder is too big, so raising the detection table-board will cause that the detection vehicle can’t be in and out of the test bench. And the other question is how to protect the testing instrument and how to transport the instrument. By reducing the radial size and increasing axial size of the eddy current retarder (Keep the absorption power unchanged) reaches to reduce the height and the center of gravity of the detection table-board. By a box installed testing instrument, both sides of the panel can be open to the fold station as a lead plate in order to solve the problem that the detection vehicle can't pass in and out of test bench. The switch-type ceiling can open up when testing and pack up when transporting in order to be back from the rain. It reaches the goal that the whole testing equipment can be moved by using ordinary vehicle.

Abstract: A control strategy for pneumatic ABS(Anti-lock Braking System) of commercial vehicle has been developed and validated by combining with Trucksim simulation software and by using hardware-in-the-loop test bench for hysteresis characteristics compensation. The test results show that the ABS control strategy satisfies the control requirements for system hysteresis characteristics, and improve the performance of pneumatic ABS system for commercial vehicle effectively, thus vehicle active safety is increased.

Abstract: Aiming at the badly needed goal of energy saving, the retrofit is implemented by adopting the stepless speed regulation of motor driving by the high-voltage inverter to regulate the air quantity. The inverter is taken its character of easy manipulation, small maintenance, high control precision as the advantage to replace the traditional device like air door operated and wind deflector operated methods. Furthermore, the feasibility analysis for the energy-saving effect after retrofit will be conducted. It has been concluded that there are obvious improvements both in energy saving and operational stability after the frequency conversion retrofit on the machine.

Abstract: In this paper, we designed an electrostatic driving MEMS torsional micromirror. The operation principle of the torsional micromirror is analyzed. Based on the analysis, a set of optimized design parameters of the micromirror is suggested. The design optimization of the micromirror is also performed with MathCAD software. At last an ANSYS simulation is achieved in the paper, which proves that the micromirror can provide a maximum workable torsional angle rotation of ±0.55º with corresponding driving voltage of 17.5V.

Abstract: In this paper, appropriate experiments were performed to explore the hysteresis in piezoceramic actuators under different excitations, and the experimental data were analyzed to describe the relations between frequency, amplitude and waveform of excitations, actuators temperature and hysteresis loops of piezoceramic actuators, based on maximum hysteresis error (MHE), peak-to-peak output amplitude (PPOA) and the ratio of MHE to PPOA (ROMP) of the curves. Finally, we proposed several advices on the use and research of piezoceramic actuators.