Mitsubishi Electric SF-PR Series, Instruction Manual, Page: 12 / 36

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(2) Use an arm-type pulley that has a ventilation hole so that the pulley does not obstruct the ventilation cooling.
Provide as large a ventilation hole as possible if a flat plate type is to be used. (Refer to Fig. 5.)
(3) The V-Belt speed is as follows.
Standard V-belt max. 30m/s (Max. pulley diameter for 4-pole motor is 320.)
Narrow V-belt max. 40m/s (Max. pulley diameter for 4-pole motor is 425.)
(4) Select the gear-ratio so that the contact angle
φ
of the belt and pulley is 140° or higher. (Refer to Fig. 4.)
Table 4 Application of V-belt and V-pulley and the deflection force for standard motors (Contact angle 140°)
Rate
output
kW
No.
of
poles
Standard V-belt Narrow V-belt
Model
No.
of
belts
Pulley Deflection force Td (N/pcs)
Model
No.
of
belts
Pulley Deflection force Td (N/pcs)
Nominal
diameter
(min. value)
Width
(max.
value)
For new belt
For
retensioning
Nominal
diameter
(min. value)
Width
(max.
value)
For new belt
For
retensioning
0.75
1.5
2.2
3.7
5.5
7.5 2
2
2
2
2
2 A
A
A
A
A
A 1
2
2
3
3
3 80
80
90
90
112
132
20
35
35
50
50
50 6.9 to 7.8
7.8 to 8.8
9.8 to 11
9.8 to 12
13 to 15
15 to 18
5.4 to 6.9
5.9 to 7.8
7.8 to 9.8
7.8 to 9.8
9.8 to 13
12 to 15
3V
3V
3V
3V
3V
3V 1
1
1
2
3
4 71
75
75
75
75
80 17.4
17.4
17.4
27.7
38.0
48.3
6.9 to 7.8
13 to 15
18 to 21
16 to 18
16 to 18
15 to 18
5.9 to 6.9
9.8 to 13
14 to 18
13 to 16
13 to 16
12 to 15
0.75
1.5
2.2
3.7
5.5
7.5
11
15
18.5
22
30
37
45
55
4
4
4
4
4
4
4
4
4
4
4
4
4
4 A
A
A
A
B
B
B
B
B
B
C
C
C
C 1
2
2
3
3
3
4
5
5
5
5
6
6
7 80
90
100
112
125
150
160
170
200
224
224
224
265
265
20
35
35
50
63
63
82
101
101
101
136
161.5
161.5
187
11 to 13
11 to 12
14 to 16
14 to 16
19 to 22
22 to 25
23 to 25
24 to 26
25 to 28
27 to 31
39 to 45
40 to 46
44 to 51
46 to 53
8.8 to 11
7.8 to 11
11 to 14
11 to 14
15 to 19
17 to 22
18 to 23
18 to 24
20 to 25
22
to 27
30 to 39
31 to 40
34 to 44
36 to 46
3V
3V
3V
3V
3V
3V
3V
3V
3V
3V
5V
5V
5V
5V 1
2
2
2
3
3
4
6
6
6
4
4
4
5 71
75
75
100
100
125
125
125
140
160
180
200
224
224
17.4
27.7
27.7
27.7
38.0
38.0
48.3
68.9
68.9
68.9
77.9
77.9
77.9
95.4
13 to 15
13 to 15
18 to 21
23 to 25
22 to 25
24 to 27
26 to 30
24 to 27
26 to 30
27 to 31
52 to 60
58 to 67
63 to 73
62 to 71
9.8 to 13
9.8 to 13
14 to 18
18 to 23
17 to 22
19 to 24
21 to 26
19 to 24
21 to 26
22 to 27
41 to 52
45 to 58
49 to 63
48 to 62
0.75
1.5
2.2
3.7
5.5
7.5
11
15
18.5
22
30
37
45
6
6
6
6
6
6
6
6
6
6
6
6
6 A
A
A
B
B
B
B
B
C
C
C
C
C 2
2
3
3
3
4
5
5
4
5
5
6
7 80
100
100
125
150
150
170
224
224
224
265
265
280
35
35
50
63
63
82
101
101
110.5
136
136
161.5
187
8.8 to 9.8
14 to 16
13 to 15
18 to 21
23 to 25
23 to 25
24 to 27
25 to 29
39 to 45
38 to 43
44 to 51
45 to 52
45 to 52
6.9 to 8.8
11 to 14
11 to 13
14 to 18
18 to 23
18 to 23
19 to 24
20 to 25
30 to 39
29 to 38
34 to 44
35 to 45
35 to 45
3V
3V
3V
3V
3V
3V
3V
3V
5V
5V
5V
5V
5V 1
2
2
3
3
4
5
6
3
4
4
4
5 75
75
90
100
140
140
140
160
180
180
224
224
224
17.4
27.7
27.7
38.0
38.0
48.3
58.6
68.9
60.4
77.9
77.9
77.9
95.4
18 to 20
18 to 21
22 to 25
22 to 25
24 to 26
24 to 27
27 to 31
27 to 31
62 to 71
55 to 64
61 to 70
74 to 84
72 to 82
14 to 18
14 to 18
17 to 22
17 to 22
19 to 24
19 to 24
22 to 27
22 to 27
48 to 62
43 to 55
47 to 61
57 to 74
56 to 72