-
Y2系列三相异步电动机
-
Y2系列三相异步电动机
- 型号Y2系列
- 品牌九洲
- 价格
九洲风机，普惠风机
概述：
Y2系列电动机是Y系列电机的更新换代产品，是一般用途的全封闭自扇冷式鼠笼型三相异步电动机。
它是我国九十年代最新产品，其整体水平已达到国外同类产品九十年代初的水平。该产品应用于国民经济各个领域，如机床、水泵、风机、压缩机，也可适用于运输、搅拌、印刷、农机、食品等各类不含易燃、易爆或腐蚀性气体的场合。
参数：
基本参数
|
额定电压
|
伏
|
220
|
||||||||
|---|---|---|---|---|---|---|---|---|---|---|
|
额定频率
|
赫兹
|
50/60
|
||||||||
|
输入功率
|
瓦
|
≤28
|
||||||||
|
输入电流
|
毫安
|
≤80
|
||||||||
|
绝缘等级
|
E
|
|||||||||
|
输出转速
|
50Hz
|
转/分
|
5
|
10
|
15
|
18
|
24
|
30
|
50
|
|
|
输出力矩
|
公斤/厘米
|
60
|
60
|
50
|
41
|
31
|
25
|
15
|
||
技术参数
|
型 号
|
额定功率
|
电流 （安培）
|
转速 (转/分）
|
效率 (%)
|
功率 因数
|
最大转矩
|
堵转转矩
|
堵转电流
|
噪声 限值
|
振动 限值
|
重量 （千克）
|
|
|
千瓦
|
马力
|
额定转矩
|
额定转矩
|
额定电流
|
||||||||
|
Type
|
Rated Output
|
Current
(A) at 380V
|
Speed
(r/min)
|
Eff
(%)
|
Power
Factor (cosφ)
|
Max Torque
|
Locked Torque
|
Locked Current
|
Noise
Limit dB(A)
|
Vibraticn
Limit
(mm/s)
|
Weight
(kg)
|
|
|
kW
|
HP
|
Rated Torque
|
Rated Torque
|
Rated Current
|
||||||||
|
Y2—63M1—2
|
O.18
|
O.25
|
O.53
|
2720
|
65.0
|
0.80
|
2.2
|
2.2
|
5.5
|
61
|
1.8
|
9
|
|
Y2—63M2—2
|
O.25
|
O.33
|
O.69
|
2720
|
68.0
|
O.81
|
2.2
|
2.2
|
5.5
|
61
|
1.8
|
1O
|
|
Y2—71M1—2
|
O.37
|
O.50
|
O.99
|
2740
|
70.O
|
O.81
|
2.2
|
2.2
|
6.1
|
64
|
1.8
|
14
|
|
Y2—71M2—2
|
O.55
|
0.75
|
1.40
|
2740
|
73.O
|
O.82
|
2.3
|
2.2
|
6.1
|
64
|
1.8
|
15
|
|
Y2—80M1—2
|
O.75
|
1.O
|
1.83
|
2840
|
75.O
|
O.83
|
2.3
|
2.2
|
6.1
|
67
|
1.8
|
18
|
|
Y2—80M2—2
|
1.1
|
1.5
|
2.58
|
2840
|
77.O
|
O.84
|
2.3
|
2.2
|
7.O
|
67
|
1.8
|
19
|
|
Y2—90S一2
|
1.5
|
2.O
|
3.43
|
2840
|
79.O
|
O.84
|
2.3
|
2.2
|
7.O
|
72
|
1.8
|
22
|
|
Y2—90L一2
|
2.2
|
3.O
|
4.85
|
2840
|
81.O
|
O.85
|
2.3
|
2.2
|
7.0
|
72
|
1.8
|
25
|
|
Y2—100L一2
|
3
|
4.O
|
6.31
|
2860
|
83.0
|
0.87
|
2.3
|
2.2
|
7.5
|
76
|
1.8
|
33
|
|
Y2—112M一2
|
4
|
5.5
|
8.1
|
2880
|
85.O
|
O.88
|
2.3
|
2.2
|
7.5
|
77
|
1.8
|
42
|
|
Y2—132S1—2
|
5.5
|
7.5
|
11.O
|
2900
|
86.0
|
O.88
|
2.3
|
2.2
|
7.5
|
80
|
1.8
|
60
|
|
Y2—132S2—2
|
7.5
|
1O
|
14.9
|
2900
|
87.0
|
O.88
|
2.3
|
2.2
|
7.5
|
80
|
1.8
|
65
|
|
Y2—160M1—2
|
11
|
15
|
21.3
|
2930
|
88.O
|
0.89
|
2.3
|
2.2
|
7.5
|
86
|
2.8
|
109
|
|
Y2—160M2—2
|
15
|
20
|
28.8
|
2930
|
89.O
|
O.89
|
2.3
|
2.2
|
7.5
|
86
|
2.8
|
118
|
|
Y2—160L一2
|
18.5
|
25
|
34.7
|
2930
|
90.O
|
0.90
|
2.3
|
2.2
|
7.5
|
86
|
2.8
|
141
|
|
Y2—180M一2
|
22
|
30
|
41.O
|
2940
|
90.5
|
O.90
|
2.3
|
2.O
|
7.5
|
89
|
2.8
|
170
|
|
Y2—200L1—2
|
30
|
40
|
55.5
|
2950
|
91.2
|
O.90
|
2.3
|
2.O
|
7.5
|
92
|
2.8
|
249
|
|
Y2—200L12一2
|
37
|
50
|
67.9
|
2950
|
92.O
|
0.90
|
2.3
|
2.0
|
7.5
|
92
|
2.8
|
255
|
|
Y2—225M一2
|
45
|
60
|
82.3
|
2960
|
92.3
|
0.90
|
2.3
|
2.O
|
7.5
|
92
|
2.8
|
306
|
|
Y2—250M一2
|
55
|
75
|
101
|
2965
|
92.5
|
0.90
|
2.3
|
2.0
|
7.5
|
93
|
3.5
|
403
|
|
Y2—280S一2
|
75
|
1OO
|
134
|
2970
|
93.2
|
O.91
|
2.3
|
2.0
|
7.5
|
94
|
3.5
|
544
|
|
Y2—280M一2
|
90
|
125
|
160
|
2970
|
93.8
|
O.91
|
2.3
|
2.O
|
7.5
|
94
|
3.5
|
620
|
|
Y2—315S一2
|
11O
|
150
|
195
|
2975
|
94.O
|
O.91
|
2.2
|
1.8
|
7.1
|
96
|
3.5
|
842
|
|
Y2—315M一2
|
132
|
175
|
233
|
2975
|
94.5
|
O.91
|
2.2
|
1.8
|
7.1
|
96
|
3.5
|
1010
|
|
Y2—315L1—2
|
160
|
220
|
279
|
2975
|
94.6
|
O.92
|
2.2
|
1.8
|
7.1
|
99
|
3.5
|
1110
|
|
Y2—315L2—2
|
200
|
270
|
348
|
2975
|
94.8
|
0.92
|
2.2
|
1.8
|
7.1
|
99
|
3.5
|
1200
|
|
Y2—355M一2
|
250
|
350
|
433
|
2980
|
95.3
|
O.92
|
2.2
|
1.6
|
7.1
|
103
|
3.5
|
2045
|
|
Y2—355L一2
|
315
|
425
|
544
|
2980
|
95.6
|
0.92
|
2.2
|
1.6
|
7.1
|
103
|
3.5
|
2578
|
|
Y2—63M1—4
|
O.12
|
0.17
|
0.44
|
1310
|
57.0
|
0.72
|
2.2
|
2.1
|
4.4
|
52
|
1.8
|
9
|
|
Y2—63M2—4
|
O.18
|
0.25
|
O.62
|
131O
|
60.0
|
O.73
|
2.2
|
2.1
|
4.4
|
52
|
1.8
|
1O
|
|
Y2—71M1—4
|
0.25
|
O.33
|
0.79
|
1330
|
65.O
|
0.74
|
2.2
|
2.1
|
5.2
|
55
|
1.8
|
13
|
|
Y2—71M2—4
|
O.37
|
O.50
|
1.12
|
1330
|
67.O
|
O.75
|
2.2
|
2.1
|
5.2
|
55
|
1.8
|
14
|
|
Y2—80M1—4
|
O.55
|
O.75
|
1.57
|
1390
|
71.0
|
O.75
|
2.3
|
2.4
|
5.2
|
58
|
1.8
|
17
|
|
Y2—80M2—4
|
O.75
|
1.O
|
2.03
|
1390
|
73.0
|
O.77
|
2.3
|
2.4
|
6.O
|
58
|
1.8
|
18
|
|
Y2—90S一4
|
1.1
|
1.5
|
2.89
|
1390
|
75.0
|
O.77
|
2.3
|
2.3
|
6.O
|
61
|
1.8
|
23
|
|
Y2—90L一4
|
1.5
|
2.O
|
3.7
|
1390
|
78.O
|
O.79
|
2.3
|
2.3
|
6.0
|
6.1
|
1.8
|
26
|
|
Y2—100L1—4
|
2.2
|
3.O
|
5.16
|
141O
|
80.O
|
O.81
|
2.3
|
2.3
|
7.0
|
64
|
1.8
|
33
|
|
Y2—100L2—4
|
3
|
4.O
|
6.78
|
141O
|
82.O
|
O.82
|
2.3
|
2.3
|
7.O
|
64
|
1.8
|
37
|
|
Y2—112M一4
|
4
|
5.5
|
8.8
|
1435
|
84.O
|
O.82
|
2.3
|
2.3
|
7.O
|
65
|
1.8
|
46
|
|
Y2—132S一4
|
5.5
|
7.5
|
11.8
|
1440
|
85.0
|
O.83
|
2.3
|
2.3
|
7.O
|
71
|
1.8
|
63
|
|
Y2—132M一4
|
7.5
|
1O
|
15.6
|
1440
|
87.O
|
0.84
|
2.3
|
2.3
|
7.O
|
71
|
1.8
|
76
|
|
Y2—160M一4
|
11
|
15
|
22.3
|
1460
|
88.0
|
O.85
|
2.3
|
2.2
|
7.O
|
75
|
2.8
|
116
|
|
Y2—160L一4
|
15
|
20
|
30.1
|
1460
|
89.0
|
O.85
|
2.3
|
2.2
|
7.5
|
75
|
2.8
|
135
|
|
Y2一180M一4
|
18.5
|
25
|
36.5
|
1470
|
90.5
|
O.85
|
2.3
|
2.2
|
7.5
|
76
|
2.8
|
175
|
|
Y2—1801-4
|
22
|
30
|
43.2
|
1470
|
91.O
|
0.85
|
2.3
|
2.2
|
7.5
|
76
|
2.8
|
185
|
|
Y2—200L一4
|
30
|
40
|
57.6
|
1470
|
92.0
|
O.86
|
2.3
|
2.2
|
7.2
|
79
|
2.8
|
250
|
|
Y2—225S一4
|
37
|
50
|
69.9
|
1475
|
92.5
|
O.87
|
2.3
|
2.2
|
7.2
|
81
|
2.8
|
306
|
|
Y2—225M一4
|
45
|
60
|
84.7
|
1475
|
92.8
|
O.87
|
2.3
|
2.2
|
7.2
|
81
|
2.8
|
342
|
|
Y2-250M-4
|
55
|
75
|
103
|
1480
|
93.O
|
O.87
|
2.3
|
2.2
|
7.2
|
83
|
3.5
|
420
|
|
Y2—280S一4
|
75
|
1OO
|
140
|
1480
|
93.8
|
O.87
|
2.3
|
2.2
|
7.2
|
86
|
3.5
|
562
|
|
Y2—280M一4
|
90
|
125
|
167
|
1480
|
94.2
|
O.87
|
2.3
|
2.2
|
7.2
|
86
|
3.5
|
667
|
|
Y2—315S一4
|
11O
|
150
|
201
|
1480
|
94.5
|
O.88
|
2.2
|
2.1
|
6.9
|
93
|
3.5
|
1O00
|
|
Y2—315M一4
|
132
|
175
|
240
|
1480
|
94.8
|
O.88
|
2.2
|
2.1
|
6.9
|
93
|
3.5
|
1100
|
|
Y2—315L1—4
|
160
|
220
|
287
|
1480
|
94.9
|
O.89
|
2.2
|
2.1
|
6.9
|
97
|
3.5
|
1160
|
|
Y2—315L2—4
|
200
|
270
|
359
|
1480
|
95.O
|
O.89
|
2.2
|
2.1
|
6.9
|
97
|
3.5
|
1200
|
|
Y2—355M一4
|
250
|
350
|
443
|
1490
|
95.3
|
O.90
|
2.2
|
2.1
|
6.9
|
101
|
3.5
|
2050
|
|
Y2—355L一4
|
315
|
425
|
556
|
1490
|
95.6
|
O.90
|
2.2
|
2.1
|
6.9
|
101
|
3.5
|
2698
|
|
Y2—71M1—6
|
0.18
|
O.25
|
O.74
|
850
|
56.0
|
O.66
|
2.O
|
1.9
|
4.O
|
52
|
1.8
|
13
|
|
Y2—71M2—6
|
O.25
|
O.33
|
O.95
|
850
|
59.0
|
O.68
|
2.0
|
1.9
|
4.O
|
52
|
1.8
|
14
|
|
型号
|
额定 功率
|
电流 （安培）
|
转速 （转/分）
|
效率 (%)
|
功率 因数
|
最大转矩
|
堵转转矩
|
堵转电流
|
噪声 限值
|
振动 限值
|
重量 （千克）
|
|
|
千瓦
|
马力
|
额定转矩
|
额定转矩
|
额定电流
|
||||||||
|
Type
|
Rated Output
|
Current
(A)
at 380V
|
Speed
(r/min)
|
Eff
(%)
|
Power Factor (COSφ)
|
Max Torque
|
Locked Torque
|
Locked Current
|
Noise Limit dB(A)
|
vibraticn
Limit (mm/s)
|
Weight
(kg)
|
|
|
kW
|
HP
|
Rated Torque
|
Rated Torque
|
Rated Current
|
||||||||
|
Y2—80M1—6
|
0.37
|
O.50
|
1.3
|
885
|
62.0
|
0.70
|
2.O
|
1.9
|
4.7
|
54
|
1.8
|
19
|
|
Y2-80M2—6
|
O.55
|
O.75
|
1.79
|
885
|
65.O
|
0.72
|
2.1
|
1.9
|
4.7
|
54
|
1.8
|
20
|
|
Y2-90S-6
|
O.75
|
1.O
|
2.29
|
91O
|
69.O
|
0.72
|
2.1
|
2.O
|
5.5
|
57
|
1.8
|
22
|
|
Y2—90L一6
|
1.1
|
1.5
|
3.18
|
91O
|
72.O
|
0.73
|
2.1
|
2.O
|
5.5
|
57
|
1.8
|
24
|
|
Y2-100L一6
|
1.5
|
2.O
|
3.94
|
920
|
76.O
|
O.76
|
2.1
|
2.O
|
5.5
|
61
|
1.8
|
32
|
|
Y2-112M一6
|
2.2
|
3.O
|
5.6
|
935
|
79.O
|
O.76
|
2.1
|
2.1
|
6.5
|
65
|
1.8
|
42
|
|
Y2-132S一6
|
3
|
4.0
|
7.4
|
960
|
81.O
|
O.76
|
2.1
|
2.1
|
6.5
|
69
|
1.8
|
58
|
|
Y2—132M1—6
|
4
|
5.5
|
9.8
|
960
|
82.O
|
O.76
|
2.1
|
2.1
|
6.5
|
69
|
1.8
|
69
|
|
Y2—132M2—6
|
5.5
|
7.5
|
12.9
|
960
|
84.O
|
O.77
|
2.1
|
2.1
|
6.5
|
69
|
1.8
|
81
|
|
Y2-160M一6
|
7.5
|
1O
|
17.O
|
970
|
86.O
|
0.78
|
2.1
|
2.O
|
6.5
|
73
|
2.8
|
111
|
|
Y2-160L一6
|
11
|
15
|
24.2
|
970
|
87.5
|
O.79
|
2.1
|
2.O
|
6.5
|
73
|
2.8
|
139
|
|
Y2-180L一6
|
15
|
20
|
31.6
|
970
|
89.O
|
0.81
|
2.1
|
2.1
|
7.O
|
73
|
2.8
|
185
|
|
Y2-200L1—6
|
18.5
|
25
|
38.6
|
980
|
90.O
|
O.81
|
2.1
|
2.1
|
7.O
|
76
|
2.8
|
228
|
|
Y2—200L2—6
|
22
|
30
|
44.7
|
980
|
90.O
|
O.83
|
2.1
|
2.1
|
7.0
|
76
|
2.8
|
260
|
|
Y2-225M-6
|
30
|
40
|
59.3
|
980
|
91.5
|
O.84
|
2.1
|
2.O
|
7.O
|
76
|
2.8
|
292
|
|
Y2-250M-6
|
37
|
50
|
71
|
980
|
92.O
|
O.86
|
2.1
|
2.1
|
7.O
|
78
|
3.5
|
408
|
|
Y2-280S-6
|
45
|
60
|
86
|
980
|
92.5
|
0.86
|
2.O
|
2.1
|
7.O
|
80
|
3.5
|
536
|
|
Y2-280M-6
|
55
|
75
|
105
|
980
|
92.8
|
O.86
|
2.O
|
2.1
|
7.O
|
80
|
3.5
|
595
|
|
Y2-315S-6
|
75
|
1OO
|
141
|
985
|
98.5
|
O.86
|
2.0
|
2.O
|
7.O
|
85
|
3.5
|
930
|
|
Y2-315M-6
|
90
|
125
|
169
|
985
|
93.8
|
O.86
|
2.O
|
2.O
|
7.O
|
85
|
3.5
|
1030
|
|
Y2-315L1—6
|
110
|
150
|
206
|
985
|
94.O
|
0.86
|
2.O
|
2.O
|
6.7
|
85
|
3.5
|
1150
|
|
Y2-315L2—6
|
132
|
175
|
244
|
985
|
94.2
|
O.87
|
2.O
|
2.O
|
6.7
|
85
|
3.5
|
121O
|
|
Y2-355M1-6
|
160
|
220
|
292
|
990
|
94.5
|
O.88
|
2.O
|
1.9
|
6.7
|
92
|
3.5
|
1696
|
|
Y2-355M2—6
|
200
|
270
|
365
|
990
|
94.7
|
O.88
|
2.0
|
1.9
|
6.7
|
92
|
3.5
|
2020
|
|
Y2—355L一6
|
250
|
350
|
455
|
990
|
94.9
|
O.88
|
2.0
|
1.9
|
6.7
|
92
|
3.5
|
2865
|
|
Y2-80M1—8
|
O.18
|
0.25
|
O.88
|
645
|
51.O
|
O.61
|
1.9
|
1.8
|
3.3
|
52
|
1.8
|
17
|
|
Y2-80M2—8
|
O.25
|
0.33
|
1.15
|
645
|
54.O
|
O.61
|
1.9
|
1.8
|
3.3
|
52
|
1.8
|
18
|
|
V2—90S一8
|
O.37
|
O.50
|
1.49
|
670
|
62.O
|
O.61
|
1.9
|
1.8
|
4.O
|
56
|
1.8
|
22
|
|
Y2—90L一8
|
O.55
|
O.75
|
2.17
|
670
|
63.O
|
O.61
|
2.O
|
1.8
|
4.O
|
56
|
1.8
|
24
|
|
Y2—100L1—8
|
0.75
|
1.0
|
2.39
|
680
|
71.O
|
O.67
|
2.O
|
1.8
|
4.O
|
59
|
1.8
|
28
|
|
Y2—100L2—8
|
1.1
|
1.5
|
3.37
|
680
|
73.O
|
O.69
|
2.O
|
1.8
|
5.O
|
59
|
1.8
|
30
|
|
Y2—112M一8
|
1.5
|
2.O
|
4.5
|
690
|
75.O
|
O.69
|
2.O
|
1.8
|
5.O
|
61
|
1.8
|
37
|
|
Y2—132S一8
|
2.2
|
3.0
|
6.O
|
705
|
78.O
|
O.71
|
2.0
|
1.8
|
6.O
|
64
|
1.8
|
58
|
|
Y2—132M一8
|
3
|
4.O
|
7.9
|
705
|
79.O
|
O.73
|
2.O
|
1.8
|
6.O
|
64
|
1.8
|
74
|
|
Y2-160M1—8
|
4
|
5.5
|
1O.3
|
720
|
81.O
|
O.73
|
2.O
|
1.9
|
6.O
|
68
|
2.8
|
11O
|
|
Y2—160M2—8
|
5.5
|
7.5
|
13.6
|
720
|
83.0
|
O.74
|
2.O
|
2.O
|
6.O
|
68
|
2.8
|
111
|
|
Y2—160L一8
|
7.5
|
10
|
17.8
|
720
|
85.5
|
O.75
|
2.O
|
2.0
|
6.0
|
68
|
2.8
|
137
|
|
Y2-180L一8
|
11
|
15
|
25.1
|
730
|
87.5
|
O.76
|
2.O
|
2.O
|
6.6
|
70
|
2.8
|
174
|
|
Y2—200L一8
|
15
|
20
|
34.1
|
730
|
88.0
|
O.76
|
2.O
|
2.O
|
6.6
|
73
|
2.8
|
255
|
|
Y2—225S一8
|
18.5
|
25
|
41.1
|
730
|
90.O
|
O.76
|
2.O
|
1.9
|
6.6
|
73
|
2.8
|
261
|
|
Y2—225M一8
|
22
|
30
|
47.4
|
730
|
90.5
|
O.78
|
2.O
|
1.9
|
6.6
|
73
|
2.8
|
287
|
|
Y2—250M一8
|
30
|
40
|
64
|
735
|
91.O
|
O.79
|
2.O
|
1.9
|
6.6
|
75
|
3.5
|
405
|
|
Y2—280S一8
|
37
|
50
|
78
|
735
|
91.5
|
O.79
|
2.0
|
1.9
|
6.6
|
76
|
3.5
|
497
|
|
Y2—280M一8
|
45
|
60
|
94
|
735
|
92.O
|
O.79
|
2.O
|
1.8
|
6.6
|
76
|
3.5
|
556
|
|
Y2—315S一8
|
55
|
75
|
111
|
735
|
92.8
|
O.81
|
2.O
|
1.8
|
6.6
|
82
|
3.5
|
918
|
|
Y2—315M一8
|
75
|
1OO
|
151
|
735
|
93.0
|
O.81
|
2.O
|
1.8
|
6.6
|
82
|
3.5
|
1055
|
|
Y2—315L1—8
|
90
|
125
|
178
|
735
|
93.8
|
O.82
|
2.O
|
1.8
|
6.6
|
82
|
3.5
|
11OO
|
|
Y2—315L2—8
|
11O
|
150
|
217
|
735
|
94.O
|
O.82
|
2.O
|
1.8
|
6.4
|
82
|
3.5
|
1140
|
|
Y2—355M1—8
|
132
|
175
|
261
|
740
|
93.7
|
O.82
|
2.O
|
1.8
|
6.4
|
90
|
3.5
|
1689
|
|
Y2—355M2—8
|
160
|
220
|
315
|
740
|
94.2
|
O.82
|
2.O
|
1.8
|
6.4
|
90
|
3.5
|
2048
|
|
Y2—355L一8
|
200
|
270
|
388
|
740
|
94.5
|
O.83
|
2.O
|
1.8
|
6.4
|
90
|
3.5
|
2560
|
|
Y2—315S一10
|
45
|
60
|
100
|
590
|
91.5
|
O.75
|
2.O
|
1.5
|
6.2
|
82
|
3.5
|
990
|
|
Y2-315M一10
|
55
|
75
|
121
|
590
|
92.0
|
O.75
|
2.O
|
1.5
|
6.2
|
82
|
3.5
|
1150
|
|
Y2—315L1—10
|
75
|
1OO
|
162
|
590
|
92.5
|
O.76
|
2.O
|
1.5
|
6.2
|
82
|
3.5
|
1220
|
|
Y2—315L2—10
|
90
|
125
|
191
|
590
|
93.O
|
O.77
|
2.O
|
1.5
|
6.2
|
82
|
3.5
|
151O
|
|
Y2-355M1—1O
|
11O
|
150
|
230
|
590
|
93.2
|
0.78
|
2.O
|
1.3
|
6.O
|
90
|
3.5
|
1980
|
|
Y2—352M2一10
|
132
|
175
|
275
|
590
|
93.5
|
O.78
|
2.O
|
1.3
|
6.O
|
90
|
3.5
|
2376
|
|
Y2—355L一1O
|
160
|
220
|
334
|
590
|
93.5
|
O.78
|
2.O
|
1.3
|
6.O
|
90
|
3.5
|
261O
|
标签: Y2系列三相异步电动机
- 上一条九洲风机Y2-400系列电机
- 下一条YL系列双值单相异步电动机
