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电工题库
1、这里的感应电动势的公式，就是正宗的法拉第电磁感应定律；
它反映出来的知识变化率，rate
of
change
with
respect
to
time，
是对时间的瞬时变化率，这是最正规、最准确的公式，BLV
只是它的一个推导出来的结果。
.
2、这里的感应电动势，是自感电动势
self-induced
emf；
emf
=
感生电动势
=
electromotive
force，
emf
≠
电磁力
=
electromagnetic
force
，
这是国内教科书上经常出现的误导，都是根据
emf
胡乱猜测。
.
3、平时我们所学的感生电动势，对于非物理、非电机工程、电器
过程、电气工程、电力工程的人来说，所学的只是互感
mutual
induction，其实是教科书误导了他他们。
time的用法
time
[taim]
n.
时间, 时侯, 时机, 节拍, 期限, 次数, 时期, 比赛限时
vt.
安排...的时间, 记录...的时间, 计时, 定时
vi.
打拍子, (...)合拍
adj.
时间的, 记时的, 定时的, 定期的, 分期的
n.
DOS命令：显示并允许改变系统时间
time
time
AHD:[tºm]
D.J.[taim]
K.K.[ta!m]
n.（名词）
Abbr. t., T.
缩写 t.， T.
A nonspatial continuum in which events occur in apparently irreversible succession from the past through the present to the future.
时间：事件从过去到现在至未来以不可逆转的顺序发生的非空间性的延续
An interval separating two points on this continuum; a duration:
一段时间：在这种延续中相隔两点之间的间隔；持续时间：
a long time since the last war; passed the time reading.
上次战争后很长一段时间；以读书消磨时光
A number, as of years, days, or minutes, representing such an interval:
如年、日或分等代表这一段时间的数字：
ran the course in a time just under four minutes.
在不到四分钟的时间里跑完全程
A similar number representing a specific point on this continuum, reckoned in hours and minutes:
时刻：以小时和分来计算的代表该延续中特定点的类似数字：
checked her watch and recorded the time, 6:17 a.m.
她看了看表并记下了时间，上午 6:17
A system by which such intervals are measured or such numbers are reckoned:
度量持续时间和计算数字的系统：
solar time.
太阳时
Often times An interval, especially a span of years, marked by similar events, conditions, or phenomena; an era:
常作 times 时代：尤指许多年等以类似事件、状况或现象为标志的一段时间；时代：
hard times; a time of troubles.
艰难时期；动乱时代
times The present with respect to prevailing conditions and trends:
times 时势：反映流行状况和趋势的现今状况：
You must change with the times.
你必须随着时势的转变而改变
A suitable or opportune moment or season:
适当时机：合适或幸运的时机或季节：
a time for taking stock of one's life.
对一个人的一生作出评价的时候
Periods or a period designated for a given activity:
规定时间：指定进行特定活动的一段或多段时间：
harvest time; time for bed.
收获期；睡觉时间
Periods or a period necessary or available for a given activity:
活动所需的时间：特定活动的必要或可行的一个或多个阶段：
I have no time for golf.
我没时间打高尔夫球
A period at one's disposal:
可供自己支配的时间：
Do you have time for a chat?
你有时间聊一会儿吗?
An appointed or fated moment, especially of death or giving birth:
时限：一个指定或命中注定的时刻，尤指死亡或出生：
He died before his time. Her time is near.
他早逝了。她的临产期快到了
One of several instances:
多次之一：
knocked three times; addressed Congress for the last time before retirement.
敲了三下；退休前最后一次在议会演讲
times Used to indicate the number of instances by which something is multiplied or divided:
times 倍：用来表示某物被乘或除的次数：
This tree is three times taller than that one. My library is many times smaller than hers.
这棵树比那棵树高三倍。我的藏书比她的少好几倍
One's lifetime.
人的一生
One's period of greatest activity or engagement.
人一生中最活跃或好斗的时期
A person's experience during a specific period or on a certain occasion:
时光：一个人在某段时间或某个场合中的经历：
had a good time at the party.
晚会上玩得很好
A period of military service.
服兵役期
A period of apprenticeship.
学徒期
Informal A prison sentence.
【非正式用语】 刑期
The customary period of work:
日常工作时间：
hired for full time.
专职工作
The period spent working.
工作时间
The hourly pay rate:
时薪：每小时付的钱：
earned double time on Sundays.
在星期日挣双份工资
The period during which a radio or television program or commercial is broadcast:
播出时间：广播或电视中节目或商业广告播出的时间：
“There's television time to buy”(Brad Goldstein)
“可以购买的电视播出时间”(布拉德·戈尔茨坦)
The rate of speed of a measured activity:
速率：有节奏行动的速率：
marching in double time.
以快两倍的速度行进
Music
【音乐】
The characteristic beat of musical rhythm:
拍子：音乐节奏特定的拍子：
three-quarter time.
四三拍
The rate of speed at which a piece of music is played; the tempo.
速度：演奏音乐作品的速率；速度
Chiefly British The hour at which a pub closes.
【多用于英国】 酒馆关门时间
Sports A time-out.
【体育运动】 暂停
adj.（形容词）
Of, relating to, or measuring time.
时间的：属于、有关或测定时间的
Constructed so as to operate at a particular moment:
定时的：设计以便在某一时刻运作的：
a time release.
定时发行
Payable on a future date or dates.
定期的：在未来的某个或某些时期偿还的
Of or relating to installment buying:
（有关）分期购买的：
time payments.
分期付款
v.tr.（及物动词）
timed， tim.ing， times
To set the time for (an event or occasion).
为（某事或某场合）确定时间
To adjust to keep accurate time.
拨准：调整以保持准确时间
To adjust so that a force is applied or an action occurs at the desired time:
安排…的速度：通过调节使在预想的时间施加力量或使某事发生：
timed his swing so as to hit the ball squarely.
计算好他的摇摆度以便正好击中球
To record the speed or duration of:
记录速度或时间长度：
time a runner.
给跑步者计时
To set or maintain the tempo, speed, or duration of:
设定或保持拍子、速度或时长：
time a manufacturing process.
保持制造过程的时间
against time
With a quickly approaching time limit:
争分夺秒地，尽快地：时限很快就要到了地：
worked against time to deliver the manuscript before the deadline.
争分夺秒地工作以便在最后期限到来前交出手搞
at one time
Simultaneously.
同时的
At a period or moment in the past.
曾经：在过去的某一时刻或某段时期
at the same time
However; nonetheless.
但是，然而
at times
On occasion; sometimes.
有时；间或
behind the times
Out-of-date; old-fashioned.
过时的；陈旧的
for the time being
Temporarily.
暂时的
from time to time
Once in a while; at intervals.
时时；间或
high time
Long overdue:
早已超过时间：
It's high time that you started working.
你早该开始工作了
in good time
In a reasonable length of time.
及时，迅速：在合适的一段时间内
When or before due.
及时：在到期时或在此之前
Quickly.
迅速地
in no time
Almost instantly; immediately.
几乎马上地；立刻
in time
Before a time limit expires.
及时：在时限到来之前
Within an indefinite time; eventually:
最后，终于：在不定的时间内；最终：
In time they came to accept the harsh facts.
他们最终承认了严酷的事实
Music In the proper tempo.
【音乐】 合拍
on time
According to schedule; punctual or punctually.
按时，准时：按时间表的；准时的（地）
By paying in installments.
以分期付款方式地
time after time
Again and again; repeatedly.
一次又一次地；重复地
time and again
Again and again; repeatedly.
一次又一次；重复地
time of (one's) life
A highly pleasurable experience:
非常愉快的经历：
We had the time of our lives at the beach.
我们在海滩上度过了最愉快的时刻
time on (one's) hands
An interval with nothing to do.
无事可做的间隙
time was
There was once a time:
曾有一个时候：
“Time was when [urban gangs] were part of a . . . subculture that inner-city adolescence outgrew” (George F. Will)
“曾经有个时候城内的青年人已成长大了，[都市群体] 不再属于亚文化群的一部分” (乔治F.威尔)
Middle English
中古英语
from Old English tºa * see d³-
源自 古英语 tºa *参见 d³-
time
[taIm]
n.
时间；时光，光阴
kill time
消磨时间
no time to watch television
没有闲功夫看电视
It's time for class.
上课时间到了。
What's the time?
几点了？
How do you spend your time at home?
你在家里怎么打发时间？
I hadn't time to finish my homework.
我没有时间完成家庭作业。
Time failed me to finish all the multiple-choice questions.
我想把多选题全部做完,但时间不够了。
We have had a good time.
我们玩得很快乐。
时代，时期
in ancient times
古代
ahead of one's time
思想超时代的
behind the times
落伍，跟不上时代
次；回
This time, the policeman lost his temper.
这次,警察发脾气了。
For the first time in his life, he became the proud owner of a bed which had springs and a mattress.
有生以来第一次有了一张带垫子的弹簧床,他为此很得意。
How many times have you read this book?
你把这本书读了几遍了？
每小时工资
double time for Sundays
星期天每小时的工资是平常的两倍
乘
Three times six is eighteen.
三乘六得十八。
(pl) 目前；现在
〈音〉拍子，节拍
all the time
始终；一直
bide one's time
等待良机
from time to time
有时；偶尔；时常
have no time for
没时间做（某事）
in no time (at all)
立刻；赶快；马上
keep time
（钟表）走得准
many a time
常常；多次
on time
准时；按时
The train arrived on time.
火车准时到达。
pass the time of day
寒喧，打招呼
time
vt.
timed, timing
安排时间；选择适宜的时间
记录…所花的时间
（击球或射球）正是时候
time
来自古英语tima
time
agechancedurationepocheragenerationintervalmeasuremeteroccasionopeningopportunityperiodrhythmspelltempotermspace
time
time
AHD:[tºm]
D.J.[taim]
K.K.[ta!m]
n.
Abbr. t., T.
A nonspatial continuum in which events occur in apparently irreversible succession from the past through the present to the future.
An interval separating two points on this continuum; a duration:
a long time since the last war; passed the time reading.
A number, as of years, days, or minutes, representing such an interval:
ran the course in a time just under four minutes.
A similar number representing a specific point on this continuum, reckoned in hours and minutes:
checked her watch and recorded the time, 6:17 a.m.
A system by which such intervals are measured or such numbers are reckoned:
solar time.
Often times An interval, especially a span of years, marked by similar events, conditions, or phenomena; an era:
hard times; a time of troubles.
times The present with respect to prevailing conditions and trends:
You must change with the times.
A suitable or opportune moment or season:
a time for taking stock of one's life.
Periods or a period designated for a given activity:
harvest time; time for bed.
Periods or a period necessary or available for a given activity:
I have no time for golf.
A period at one's disposal:
Do you have time for a chat?
An appointed or fated moment, especially of death or giving birth:
He died before his time. Her time is near.
One of several instances:
knocked three times; addressed Congress for the last time before retirement.
times Used to indicate the number of instances by which something is multiplied or divided:
This tree is three times taller than that one. My library is many times smaller than hers.
One's lifetime.
One's period of greatest activity or engagement.
A person's experience during a specific period or on a certain occasion:
had a good time at the party.
A period of military service.
A period of apprenticeship.
Informal A prison sentence.
The customary period of work:
hired for full time.
The period spent working.
The hourly pay rate:
earned double time on Sundays.
The period during which a radio or television program or commercial is broadcast:
“There's television time to buy”(Brad Goldstein)
The rate of speed of a measured activity:
marching in double time.
Music
The characteristic beat of musical rhythm:
three-quarter time.
The rate of speed at which a piece of music is played; the tempo.
Chiefly British The hour at which a pub closes.
Sports A time-out.
adj.
Of, relating to, or measuring time.
Constructed so as to operate at a particular moment:
a time release.
Payable on a future date or dates.
Of or relating to installment buying:
time payments.
v.tr.
timed, tim.ing, times
To set the time for (an event or occasion).
To adjust to keep accurate time.
To adjust so that a force is applied or an action occurs at the desired time:
timed his swing so as to hit the ball squarely.
To record the speed or duration of:
time a runner.
To set or maintain the tempo, speed, or duration of:
time a manufacturing process.
against time
With a quickly approaching time limit:
worked against time to deliver the manuscript before the deadline.
at one time
Simultaneously.
At a period or moment in the past.
at the same time
However; nonetheless.
at times
On occasion; sometimes.
behind the times
Out-of-date; old-fashioned.
for the time being
Temporarily.
from time to time
Once in a while; at intervals.
high time
Long overdue:
It's high time that you started working.
in good time
In a reasonable length of time.
When or before due.
Quickly.
in no time
Almost instantly; immediately.
in time
Before a time limit expires.
Within an indefinite time; eventually:
In time they came to accept the harsh facts.
Music In the proper tempo.
on time
According to schedule; punctual or punctually.
By paying in installments.
time after time
Again and again; repeatedly.
time and again
Again and again; repeatedly.
time of (one's) life
A highly pleasurable experience:
We had the time of our lives at the beach.
time on (one's) hands
An interval with nothing to do.
time was
There was once a time:
“Time was when [urban gangs] were part of a . . . subculture that inner-city adolescence outgrew” (George F. Will)
Middle English
from Old English tºa * see d³-
晚上九点半放学英文
1.follow one's advice 听从某人建议
2.in surprise 吃惊
3.have an effect on 对什么东西有影响
4.tell A from B 分辨出A和B，区别AB
5.以……开始 start from
6.习惯于…… get used to
7.鼓励某人做某事 encourage sb to do sth
8.在某个方面 in this repect
9.对……毫不在意 indeferent to sth
10.使人吃惊的是 to one's surprise
11.轮流做某事 do sth in turn
12.欢迎来到…… welcome to...
单句改错
1.In a total ,there are sixty workers --------- in total
2.The students as well as the teacher likes watching football games---- like
3.We were playing in the garden while it to rain ------- it starts to rain
4.The flight was complete success-- was a complete
5.Sanya is the most beautiful city--- 加上in china
6.I don't believe in what she said －－ 去掉in
7.This is the second time that they come to Hainan－－ 没有错
8.The film is too interesting that all the children like it －－ 把too 改成 so
9.stand on the fifth floor or you will have a good view of it －－－把or改成and
10.You had better ask your teacher for advices －－ advice
英文文献阅读翻译神器
首先要注意的过程一小步一小步是最大限度地利用现有的扭矩是最小值当转子后从一步转向下一步。决定了这个最低的运行扭矩,最大的扭矩电机可以驾驶它慢慢向前步骤。对普通的two-winding永磁电动机和理想的正弦扭矩与位置曲线和控股扭矩h的时候,这个意愿
是氢/(7)。如果电机驱动了两个绕组的,这对理想的运行扭矩two-winding永磁电机将一样的single-winding控股扭矩。值得注意的是,在较高的步进速度
操作扭矩有时可定义为撤军扭矩。由此产生的轨迹类似于一个显示在图5。
谐振频率的电机转子取决于幅值的振荡;而作为振幅减少,谐振频率上升到
一个定义明确的方法的频率。正式,就可以计算共振方法如下。首先,回忆牛顿定律为角加速度:
μA T =
在应用于转子,T扭矩μ惯性矩的转子和负载和角加速度、按弧度/每秒。我们假定对小振幅,
转矩对转子近似为一个线性功能的平衡位置偏移。因此,虎克定律运用:
kΘ−T =
在k的“弹簧的不变的”系统,扭矩单元每弧度,Θ角位置的转子,按弧度。
我们可以把两公式的扭矩μA =−得到:kΘ。注意,加速二阶微分的位置相对于时间:d2Θ/ dt2),因此我们可以重写这上述在微分方程形式:d2Θ/ dt2 =−(k /μ)Θ。为了解决这个问题,回忆,对于:女(t)=赎罪bt.他衍生品是:
注意到,在这个讨论中,我们假设转子共鸣。因此,它有一个的运动方程类似:
罪(=Θ2πft)
是角振幅的共振;如果共振频率。这是一个允许上述微分方程的解,如果我们同意:
在实践中,这振动问题会造成重大的步进率接近一个固有的谐振频率系统;结果频发、无法控制的随机运动。模糊逻辑控制器提供了一种运算,
它把语言控制,基于专家知识成自动控制策略[13]。因此,模糊逻辑算法是近多了
精神上的人类思维的逻辑系统比传统[5,14]。主要的问题与模糊控制器产生相关的选择
调节器参数
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