【摘要】 为了设计一种N相高精确度直线电机,对电机定子和动子磁场分布、电感与磁力特性进行研究。根据定子电流层和动子永磁层的周期性分布特点,运用傅里叶级数方法得到磁场二维解析式。在此基础上,计算磁场随N值、气隙高度、电流层高度的变化趋势。通过对定子分布绕组的磁场进行积分,从而获得电感解析式,并以样机为例分析各次谐波电感特性。提出永磁阵列虚拟电流概念,结合改进的磁共能法计算出各次磁力脉动值。仿真结果表明:当气隙大于1 mm时,定子与动子磁场基本呈正弦分布,高次谐波电感与磁力脉动可忽略,仿真结果与解析解的误差小于5%。更多还原

【Abstract】 To meet the motor design optimization and control requirements,a precise mathematical model of N-phase high-precision linear motor is established.According to the periodic distribution of the stator current layer and the rotor permanent magnet layer,the Fourier series method and the magnetic boundary value equations were used to solve the two-dimensional analytical formula of the magnetic field.Then the change trends of the magnetic field with the values of phase N,the height of air gap and current layer were analyzed.The analytic formulas of magnetic flux and magnetic linkage were derived from magnetic field integral of the stator distributed windings;thus the stator winding inductance and its characteristics were obtained,and then the harmonic inductances of a prototype linear motor were analyzed as an example.The virtual current that represented the permanent magnet was proposed and an improved co-energy method was used to calculate the magnetic force pulse.Simulation results indicate the magnetic field is almost sinusoidal,and the harmonic force pulse is approximately zero.The errors of simulation and analytical results are less than 5%,and thus lay the theoretical foundation for the design optimization and real-time control of this type of linear motor.更多还原