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三相异步电动机 PowerPoint PPT Presentation


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三相异步电动机. 1. 转动原理. 2. 极数与转速. 3. 电动机的构造. 4. 定子与转子电路. 5. 转矩与机械特性. 6. 电动机的起动. 7. 电动机的调速. 8. 电动机的制动. 9. 铭牌数据. 10. 电动机的选择. 由电动机驱动的优点:减轻繁重的体力劳动;提高生产率;可实现自动控制和远距离操纵。. 电动机 是将电能转换成机械能的装置。广泛应用于现代各种机械中作为驱动。. 他励电动机. 电动机的分类:. 同步电动机. 并励电动机. 直流电动机. 串励电动机. 异步电动机. 复励电动机. .

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三相异步电动机

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5609168

1.

2.

3.

4.

5.

6.

7.

8.

9.

10.


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(1)

(2)

(3)

(4)

(5)


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1.


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A

A

Y

A

Z

C

Y

Z

P=2

X

B

C

B

X

A

X

X

X

X

Y

B

Z

C

Z

C

B

B

A

Y

Z

C

Y

A

2.

120pp=1

()60p=2.

(t=0)


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f160f1

1

2

3

4

5

6

3000

1500

1000

750

600

500

p

(f1=50Hz) pn0


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n

1. n

2. n0

n0

n n0n0

3. s

s nn0

1~9%


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n=570r/min

(f1=50Hz)

n0 n0 p570r/min


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3.


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4.

() e2 e1

N1N2


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=msint

f1 e1


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R1X1=2f1L1


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e2i2T

1.

f2


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(n0n)

2. f2

s n

s=1(n =0) f2=f1 s1~9%f2= 0.5 ~ 4.5 Hz

E20 s = 1 (n=0)


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2

3.

KVL

X2f 2

X20s=1(n=0)


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X2

I2, cos2

I2

cos2

0

1

s

I2ss(n)E2I2

I2 E2 2

s()


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T

5.

I2


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Ts

1

T

Tmax

0

sm

s

n0

0

n

U1

T =T(s)s TssT s ()Tmax


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U1R2 T= f (s) n = f (T)

Tmax

sm

1

T

n

a

n0

nN

b

s

0

T

0

n

n0

0

TN

Tst

Tmax

T= f (s)

n = f (T)

90


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n

a

n0

nN

b

T

0

TN

Tst

Tmax

1. TN

TTC T2T0T0

P2 ( W ) T (Nm)n (r / min)


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n

a

n0

nN

b

T

0

TN

Tst

Tmax

P 2N =7.5kWnN =1440 r / min

ab ab


2 t max

n

a

n0

nN

b

T

0

TN

Tst

Tmax

2. Tmax

s m (dT/ds = 0 )

TmaxU12,R2 R2 sm


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6~7

1.8~2.2


3 t st

(n =0)

n

U1

T

0

U1

R2<R2

n

R2

U1

R2

U1 <U1

T

0

Tmax

R2

3. Tst

U12 R2R2 = X20 Tst = Tmaxsm =1


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6.

  • n=0,s=1

1Ist

5-7


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2 t st

1.0~2.2

2Tst


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1

2

1


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2

1Y-

380V380V220V


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Ily=Ipy

Il

Ip

|Z|

UL

UL


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1/31/3

1/3


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Y

Y

Y

Y

Y

Y


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2

73%64%55%


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45KW

1480r/min

380V

7.0

1.9

2.2

92.3%

0.88

3

Y225M-412SN3TNTmax;Tst


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14~100KW380V

2

3


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1510.2N.mU=UNU/=0.9 UN2Y-TN80%50%

1

Tst=551.8N.m510.2N.m

U/=0.9 UN

T/st=0.92551.8=447N.m 510.2N.m

2


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  • 80%

  • 50%


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64%


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7.

1f1

2p

3s


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A1

A2

A1

X1

X2

X1

A2

X2

A

X

A

X

p

p=2

p=1


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f1=50Hz

f

+

M

~

3

~

-

50Hz


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8.


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n0=0

+

F

-

n

R

M

3

~


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n0

n

M

3

~

F


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n0

nn0

F

n


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Y132M-4

Y132M-4

7.5KW

50Hz

380V

15.4A

1440r/min

B

9.

0.8587%


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Y 132 M - 4

1

S-M-L-


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Y

JJO

YR

JRJRO

YB

JBJBO

JQJQO

YQ


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U1

U1

W2

U2

W2

U2

W1

V2

W1

V1

V2

V1

W2

U2

V2

W2

U2

V2

U1

U1

V1

V1

W1

W1

2


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3

4

5


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6

  • cos

7

  • n0=1500r/min)

8

B

A

E

0C

120

105

130


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10.


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