无刷直线直流电机非换相期间推力分析  

Analysis of Non-Commutation Force of Brushless DC Linear Motor Based on Velocity

作　　者：王刚[1] 李小民[1] 李治源[1] 李会来[1] 

机构地区：[1]军械工程学院,河北石家庄050003

出　　处：《自动化技术与应用》2012年第9期59-63,共5页Techniques of Automation and Applications

摘　　要：在电磁弹射过程中,抑制推力波动具有很重要的意义,并且要保持推力恒定,而速度对推力具有很大的影响,因此在本文中重点分析速度对推力的影响。首先建立了非换相期间无刷直线直流电机(BLDCLM)的数学模型,对数学模型进行了求解,推导出电流、推力的解析式;详细分析了PWM调制占空比、速度、反电动势系数对推力的影响,其中反电动势系数的分析结果对电机的设计具有重要的参考意义。最后,通过采用直接搜索的方法获得最优的占空比,来补偿增大的速度引起的推力下降。During the electromagnetic launchers, it is important to suppress the force ripple and keep the force in a certain interval. The force is affected by the velocity, so the key analysis is the influence of velocity upon the force. The mathematical model is established during the non-commutation interval, common formula of the current and force are derived by solving the mathematical model; the influence on force is analyzed separately by the duty cycle, velocity and back-EMF, the result of analysis of back-EMF has a certain value to the design of BLCDLM. In the end, the direct search is used to find the optimal duty cycle to compensate the decrease of force caused by the increasing velocity.

关 键 词：无刷直线直流电机 非换相推力 反电动势系数 PWM调制 

分 类 号：TM33[电气工程—电机]