| 1. | Study on harmonics and influence on the electro - magnetic torque of svpwm
谐波分析及其对电机转矩的影响 |
| 2. | According to the direction and damping characteristic of magnetic torque and the theory of linearity , the scheme of satellite attitude control just using magnetic torque is presented
根据地磁力矩定向阻尼特性和线性叠加理论，提出仅用磁力矩器实现对地指向卫星三轴姿态稳定的控制规律。 |
| 3. | The structural vibrational equations for the former are also depicted . the disturbance torques imparted by space environment are analyzed , which include gravity gradient torque , solar pressure torque , aerodynamic torque and magnetic torque
对作用在卫星上的各种空间环境力矩进行了分析,包括重力梯度力矩、太阳光压力矩、气动力矩、剩磁力矩等。 |
| 4. | The motor ' s magnetic field is analyzed with finite element method ( fem ) by ansys software . the emf and electro - magnetic torque are calculated with path method base on the air gap magnetic flux density ( b )
运用有限元分析软件ansys对电机内部磁场进行仿真分析,得出电机内部磁场磁密及磁场强度分布情况,在此基础上运用路径法对电枢反电动势、电磁转矩等电磁参数进行了分析计算。 |
| 5. | Therefore the output magnetic torque of torque motor can be increased . in this paper , mathematical model of hydraulic flapper - nozzle servo - valve is introduced . the mathematical model of magnetic fluid is built according to the reference introduction
本文给出了喷嘴挡板伺服阀的数学模型,对作用于伺服阀力矩马达的磁流体数学模型进行了推导,给出了添加磁流体的喷嘴挡板伺服阀的数学模型。 |
| 6. | This paper discussed two - pole permanent magnetic spherical motor , in which two poles of rotor are permanent magnets . the electro - magnetic relationship is analyzed and the electro - magnetic model has been developed , which includes voltage equations , flux linkage equations , and electro - magnetic torque expressions
本文研究了双极永磁型球形电动机的电磁关系，将不对称绕组折算为对称绕组，建立了电机的电磁模型：电压方程式、磁链方程式和电磁转矩方程式。 |
| 7. | The contributions done are as follows : according to the mathematical model of doubly fed motor and the theory of vector control , a unit power factor of rotor control scheme is proposed . in the doubly fed adjustment system , in order to control magnetic torque of motor this scheme is designed by controlling the reverse direction between rotor voltage and current to keep the vertical direction between rotor current and flux . it is known from theoretical analysis that for partly decoupling this scheme is only effective under sub - synchronization speed , but not control the system and obtain steady state since speed adjustment system ca n ' t adjust the magnitude of rotor flux under sup - synchronization
而传统的无速度传感器双馈调速矢量控制系统，由于采用磁链定向方法，在同步速附近存在较大的工作死区，针对上述问题，本文做了如下的研究工作：本文从双馈电机的数学模型出发，根据矢量控制的基本原理，提出了一种转子侧功率因数为1的双馈电机矢量控制方案的设想，即在双馈调速时采用转子电流定向的方法，并控制外加转子电压与转子电流始终反相，以保持了转子电流与转子磁链矢量垂直，通过控制转子电流的大小来达到控制电机电磁转矩的要求。 |
| 8. | Using quaternion as attitude representation , the attitude kinematics function is established . 2 . several kinds of disturbance torques affecting the satellite attitude are directly computed through the models described in the paper , forming a closed loop stabilization system dumped by magnetic torques and provided with initial torques through flywheels , but other simulations only estimate it by experience
( 2 )很多仿真是根据经验估算卫星所受的干扰力矩，本文以某对地观测小卫星为背景，利用所建力学模型对卫星所受数种干扰力矩进行计算，形成了一个以飞轮作为主动力矩、通过磁力矩卸载的闭环而且稳定的姿态控制系统。 |
| 9. | On the basis of the principle of direct torque control , a control strategy of the grade of errors for induction motor has been proposed to improve the performance of powertrain system of hybrid vehicle in this thesis . the stator flux error , electric magnetic torque error and flux position angle are considered as control variables , and the switching states are determined by the control rules of the direct torque control
本文在直接转矩控制系统的基础上提出了一种基于误差等级的直接转矩控制dtc策略，它以电机定子磁链误差、电机电磁转矩误差及磁链位置角作为控制变量，然后根据直接转矩控制原理制定控制规则来选择开关状态，进而提高系统瞬态时的转矩响应。 |
