Abstract:The magnetization and demagnetization process of electrohydraulic servo valve with permanent magnet torque motor is the last manufacturing process of electrohydraulic servo valve before its service, which has a significant effect on the output characteristics and magnetic stability of both torque motor and electrohydraulic servo valve. However, the previous studies mainly focus on the static state of the magnetic circuit instead of the changes of the magnetic steel’s states while operating magnetization and de… Show more
“…Its braking principle is that the adjustable power supply provides a certain voltage to the torque motor, and the high speed and low torque motion is converted into low speed and high torque rotation motion through the deceleration and torsional device of the transmission mechanism. 18 Then the motion conversion device is driven to convert the rotating motion into translational motion, and finally, the brake force is stored through the disc spring compression so that the brake shoe reserves a certain gap with the brake disc for braking. When braking is needed in the process of braking rotation, the motor control system sends out control signals to give the torque motor power off instruction, and the compression force reserved in the disc spring is randomly converted into braking force to push the brake shoe to fit the brake disc to realize braking.…”
The brake disc spindle of the electromechanical braking system will be accompanied by vibration unbalanced fault during the rotation operation, which will affect the braking performance of the brake system. In view of this phenomenon, based on the ensemble empirical mode decomposition algorithm and related energy operation theory, an offline purification program for the unbalanced axial trajectory of the spindle of electromechanical braking system are designed. Meanwhile, an online braking control feedback procedure for the axial trajectory are designed based on Cspace controller. Based on the designed program and braking theory, an experimental bench of the electro-mechanical braking system was set up, and experiments were conducted on the purification of the axial trajectory and the braking of the fault feedback respectively. The results show that the EEMD algorithm and the related energy operation theory can purify the unbalanced axial trajectory of the brake discs of the braking system and draw an ideal axial trajectory fault map; meanwhile, the experimental data of the fault feedback braking shows that the time required from the unbalanced fault monitoring to the completion of the braking process of the braking system is 1.278 s, which can effectively achieve the purpose of emergency braking in case of sudden failure. Through research, a new idea is provided for the development of electro-mechanical braking system fault detection and feedback.
“…Its braking principle is that the adjustable power supply provides a certain voltage to the torque motor, and the high speed and low torque motion is converted into low speed and high torque rotation motion through the deceleration and torsional device of the transmission mechanism. 18 Then the motion conversion device is driven to convert the rotating motion into translational motion, and finally, the brake force is stored through the disc spring compression so that the brake shoe reserves a certain gap with the brake disc for braking. When braking is needed in the process of braking rotation, the motor control system sends out control signals to give the torque motor power off instruction, and the compression force reserved in the disc spring is randomly converted into braking force to push the brake shoe to fit the brake disc to realize braking.…”
The brake disc spindle of the electromechanical braking system will be accompanied by vibration unbalanced fault during the rotation operation, which will affect the braking performance of the brake system. In view of this phenomenon, based on the ensemble empirical mode decomposition algorithm and related energy operation theory, an offline purification program for the unbalanced axial trajectory of the spindle of electromechanical braking system are designed. Meanwhile, an online braking control feedback procedure for the axial trajectory are designed based on Cspace controller. Based on the designed program and braking theory, an experimental bench of the electro-mechanical braking system was set up, and experiments were conducted on the purification of the axial trajectory and the braking of the fault feedback respectively. The results show that the EEMD algorithm and the related energy operation theory can purify the unbalanced axial trajectory of the brake discs of the braking system and draw an ideal axial trajectory fault map; meanwhile, the experimental data of the fault feedback braking shows that the time required from the unbalanced fault monitoring to the completion of the braking process of the braking system is 1.278 s, which can effectively achieve the purpose of emergency braking in case of sudden failure. Through research, a new idea is provided for the development of electro-mechanical braking system fault detection and feedback.
“…The other detailed simulation settings on the torque motor are presented in Table 2. 20,22 Figure 9.Meshing of the torque motor.…”
Section: Numerical Simulation Of the Torque Motormentioning
confidence: 99%
“…Jeong 21 derived a new torque motor model by considering the influence of permanent magnets’ leakage flux and demagnetization. Tai 22 analyzed the changes of permanent magnet’s state when the torque motor is magnetized and demagnetized, and proposed a set of theoretical models to describe the entire process of the torque motor’s magnetization and demagnetization properly. Zhang 23 changed the arrangement of permanent magnet, and analyzed the influence of some parameters including magnetic utilization, coil turns, and air-gaps’ thickness on the torque motor.…”
In the current research of the magnetic circuit model of the servo valve torque motor, the magnetic flux leaking from working air-gaps is regarded as constant. However, the working air-gaps leakage flux varies with the armature rotation angle, which affects the accuracy of the existing mathematical model of the torque motor. To solve this problem, a new mathematical model of the torque motor with two working air-gaps is built. First, different from the previous model, the variation of the working air-gaps leakage flux is considered in the magnetic circuit model. A more detailed mathematical model of the torque motor is established based on the magnetic circuit model. Second, the finite element method is used to reveal that there is a linear relationship between working air-gaps leakage flux and armature rotation angle in a certain range of rotation angles. Then, the new model is validated by numerical calculation, which indicates that the theoretical results calculated by this new model show better agreement with the simulation results compared to the previous model when the armature rotation angle increases. Further, the theoretical results of the electromagnetic torque constant and magnetic spring stiffness acquired by the new model and the previous model are compared. The comparison shows that the variation of the working air-gaps leakage flux has the greatest influence on the magnetic spring stiffness. Finally, the experiments on the torque motor are conducted to verify the accuracy of the new model. The theoretical results obtained by this new model are better consistent with the experimental results than that obtained by the previous model. This study shows that considering the variation of working air-gaps leakage flux is valuable to improve the accuracy of the magnetic circuit model of the torque motor, which provides an effective guidance for the structural optimization and performance prediction of the torque motor.
“…With the development of permanent magnet (PM) materials and power electronic technologies [1][2][3] , interior permanent magnet synchronous motors (IPMSMs) have been widely used as driving machines for electric vehicles due to their compact structures and excellent electromagnetic performances. [4][5][6] As a significant evaluation index, the vibration and noise characteristics of IPMSMs caused by variable electromagnetic (EM) excitation sources are completely different from those of internal combustion engines.…”
The accurate prediction and analysis of electromagnetic excitation source is the pre-condition for the investigation of electromagnetic vibration and noise. In this work, an analytical model for electromagnetic (EM) force calculation of interior permanent magnet synchronous motors (IPMSMs) is proposed by coupling the 2-D model in polar coordinates and the Maxwell stress tensor method (MSTM). In the modeling, the boundary conditions for solving the air-gap magnetic field are firstly simplified based on the equivalent conversion of permanent magnets (PMs). Then, the magnetic field is acquired by solving the governing equation based on the simplified boundary conditions. Finally, the EM force is obtained according to the MSTM. The effectiveness is fully verified by finite element (FE) analysis that the analytical model can be applied not only for the calculation of radial EM force of IPMSMs with/without load but also for the calculation of tangential EM force. Besides, the tangential EM force is further analyzed by 2-D Fourier decomposition, and the relationship between tangential EM force and torque fluctuation is also clarified. The results show that the radial EM force harmonics and the tangential EM force harmonics have the same spatiotemporal characteristics no matter under no-load or load. Moreover, the high-frequency components of tangential EM force harmonics with low spatial orders, which have the highest contribution to vibration and noise, are comparable to those of radial EM force harmonics. Meanwhile, the torque fluctuation of IPMSMs with/without load only comes from the zero-order tangential EM force harmonics in space.
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