永辉超市生鲜定价策略.ppt

上海交通大学
硕士学位论文
永磁直线同步电机设计研究
姓名:聂永峰
申请学位级别:硕士
专业:电机与电器
指导教师:王建辉
20090101
上海交通大学硕士学位论文
II
供了广泛空间。
作为一种较为新颖的电机,目前国内仍缺乏系统化的永磁直线同步电
机设计方案,尤其是电枢绕组部分。常用的方法仍是基于传统的旋转电
机,例如使用双层叠绕组方案。通过对实际电机的软件模拟,我们发现
这样的设计思路的表现并不能令人满意,比如造成了动子线圈槽满率过
大,电机设计难以形成系列化等缺点,而电机本身输出推力的波动也较
大。
针对传统方案的一系列缺点,本文提出了一种新的永磁直线同步电
机设计方案。该方案基于“单元电机”的概念,使用单层同心式线圈。
当目标推力要求变化时,只需改变“单元电机”的数目和排列组合的方
式,就可以达到改变的目的。而每个单元中的绕组连接方式则不需要改
变,由此避免了繁琐而复杂的绕组设计,这就给电机的系列化设计带来
了便捷。同时,单层绕组的使用也更方便嵌线,也更有利于降低铜耗,
提高效率。
在完成单元电机设计任务的基础上,本文利用加拿大Infolytica公司
对电机的运行进行了模拟,并得到
了电机的额定输出推力曲线和反电动势曲线,输出推力曲线较之传统方
案也更平稳。体现了该设计方案的优越性。

关键词永磁直线同步电机,单元电机,有限元,
上海交通大学硕士学位论文
III
Abstract

In conventional linear driving applications, original force is generated from
rotary motor, so transmission devices is need, which causes large sum of
energy loss, friction noise and brings plicated maintenances.
The introduction of linear motor targets at these problems, being able to
directly convert electrical energy to linear moving, linear motor has gradually
replaced rotary motor in linear driving applications such as lathe driving and
integrated circuit assembly.
Since the introduction of concept in mid 19th century, undergone four
periods of breed, experiment, development and application, with virtue of
power electronics and maturing controlling techniques, linear motor has been
widely used in various fields such as production, transportation, etc.
Similar to rotary motor, linear motor can be divided into various types
according to working principles. Among these different types, linear stepping
motor, linear synchronous motor and linear induction motor receive most
focus, usually linear stepping motor is utilized in applications demand high
precision, such as semi-conductor industry, while the later two often go with
large and continuous thrust applications, such as lathe. Linear synchronous
motor, especially permanent ones, receive more favor for larger thrust
上海交通大学硕士学位论文
IV
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