齿槽转矩——诸自强
本帖最后由 ddf 于 2013-5-10 22:20 编辑我受益匪浅
本帖最后由 ddf 于 2013-5-10 22:20 编辑
光有降低齿槽转矩，转矩脉动降不下来也没有用。。。。。。。应该结合两者一起来吧？
能不能介绍一下摘要呀，我怕我有了。
引起转矩脉动原因很多，但是静态时，这个是主要的原因 诸自强是浙江大学，在英国留学多年前就搞永磁电机，我在东大听过诸教授的报告，受益匪浅！ 其实关键是看各参数的优化，优化合理了，齿槽转矩/额定转矩还是比较小的，可以各种措施综合利用，比如极弧系数，分数槽等措施。 Influence of Design Parameters on Cogging Torque
in Permanent Magnet Machines
Z. Q. Zhu, Member, IEEE and David Howe
Abstract—The influence of various design parameters on the
cogging torque developed by permanent magnet machines is investigated.
It is shown that the slot and pole number combination has a
significant effect on the cogging torque, and influences the optimal
value of both skew angle and magnet arc, as well as determining the
optimal number of auxiliary teeth/slots. A simple factor, which is
proportional to the slot number and the pole number and inversely
proportional to their smallest common multiple, has been introduced
to indicate the “goodness” of the slot and pole number combination.
In general, the higher the “goodness” factor the larger
the cogging torque.
Index Terms—Cogging torque, electrical machines, machine design,
permanent magnet machines, speed ripple, torque, torque
ripple.
I. INTRODUCTION
COGGING torque results from the interaction of permanent
magnet mmf harmonics and the airgap permeance
harmonics due to slotting. It manifests itself by the tendency
of a rotor to align in a number of stable positions even when the
machine is unexcited, and results in a pulsating torque, which
does not contribute to the net effective torque. However, since
it can cause speed ripples and induce vibrations, particularly at
light load and low speed, its reduction is usually a major design
goal –.
In the paper, the effect of the slot and pole number combination
on the cogging torque is investigated, and its relationship
with various other design parameters, such as the width of
the stator slot openings, the magnet arc and the skew angle, as
well as with design features such as auxiliary teeth and slots is
considered, with respect to machines in which the magnets are
mounted adjacent to the airgap.
II. ANALYSIS TECHNIQUES
III. CHOICE OF SLOT AND POLE NUMBER COMBINATION
IV. USE OF AUXILIARY TEETH AND SLOTS
V. OPTIMAL MAGNET POLE-ARC
VI. SKEWING
VII. STATOR SLOT OPENING
VIII. CONCLUSION
Certain design parameters can have a very significant effect
on the cogging torque, in particular the slot and pole number
combination. It also affects the choice of the optimal magnet
pole-arc to pole-pitch ratio, and the optimal skew.
A simple factor has been introduced to indicate
the “goodness” of a slot and pole number combination
from the view point of cogging torque. It can, therefore, beused to aid the selection of an appropriate number of auxiliary
teeth and slots. In general, the higher the value of the largerthe cogging torque. Hence, brushless motors with overlapping
stator windings will generally produce about twice the cogging
torque as equivalent motors with nonoverlapping windings. An
odd number of slots is preferred for 2-pole motors, since is
usually smaller than for an even number of slots.
It has been found that the larger the value of then the
greater is the number of possible optimal ratios of pole-arc to
pole-pitch, while the larger the value of the greater the
number of possible values of optimal skew. 一看齿槽转矩就头疼啊，这东西还是靠斜槽和分数槽结构来削弱比较实惠，不然的话还要综合考虑纹波转矩，很难搞的说。 东西很好，永磁电机也就算这个问题较难些，剩下的就是控制和电机结合的问题了。 对呀，吃草转矩就是一个大问题呀。计算很难计算准确，不计算又不行。而且方法也不好找呀。真不知道怎么办。 在论坛上呆了一段时间，发现大家的资料真实很缺乏。这是今天中国的一个很大的问题。没办法，国外的书太贵了，动则上百刀。国内的教授们还不用心写。各个论文资源网年费还超贵。。。。
可怜的中国科研人员。
结果，社会上还一片舆论说要废英文，废英文的结果就是中国科技不仅不能进步，还要倒退20年 谢谢 正需要呢 学习啦，谢谢分享 谢谢，救急了! 齿槽转矩的减小措施真的应该搞清楚，希望有用 谢谢楼主分享 谢谢楼主分享了！ 学习啦，谢谢分享 谢谢分享，十分感谢 很不错的资料，学习了！