MOTOR SIZES FOR GEARED ELEVATORS
Values given in table are maximum rated loads of elevators and are based on the assumption that counterbalance will be
provided to equal the cage plus 40% of rated load. In other words, net loads will be 60% of elevator ratings.
ELEVATOR CAR SPEED IN FEET PER MINUTE
Elevator
M-G
25
50
75
100
125
150
200
250
300
350
400
Hoisting
Set
ASSUMED OVERALL MECHANICAL EFFICIENCY - GEARLESS EFFICIENCY - 90%
Motor
If V. V.
40
46
48
51
53
53
55
58
59
60
61
HP
KW
MAXIMUM ELEVATOR CAPACITY - LB.
3
-
2640
1500
1050
840
700
580
450
-
-
-
-
5
-
4400
2500
1750
1400
1150
970
760
630
540
470
-
7.5
5
6600
3800
2650
2100
1750
1450
1150
950
810
700
625
10
7.5
8800
5000
3500
2800
2300
1950
1500
1250
1080
940
840
12.5
7.5
11000
6300
4400
3500
2900
2400
1900
1600
1350
1175
1050
15
10
13200
7600
5300
4200
3500
2900
2250
1900
1600
1400
1250
20
15
17600
10100
7000
5600
4650
3850
3050
2550
2150
1850
1675
25
15
22000
12600
8800
7000
5800
4850
3800
3200
2700
2350
2100
30
20
26400
15200
10500
8400
7000
5800
4550
3800
3250
2800
2500
40
25
35200
20200
14000
11200
9300
7750
6100
5100
4300
3750
3350
50
30
44000
25300
17600
14000
11600
9700
7600
6350
5400
4700
4200
60
40
53000
30300
21100
16800
14000
11600
9150
7650
6500
5650
5000
75
50
66000
38000
26400
21000
17500
14500
10600
8900
8100
7050
6300
100
60
88000
50600
35200
28000
23300
19400
15200
12750
10800
9400
8400
125
75
110000
63200
44000
35000
29100
24300
19000
16000
13500
11800
10500
150
100
132000
75900
52800
42000
35000
29000
22800
19000
16000
14150
12600
The efficiencies listed may be considered as normal for first class overhead installations; if they are not correct for
the equipment to be used, corrections to correspond to actual available efficiencies must be made in figures
tabulated above.
This page does not apply to basement type installations because of poorer mechanical efficiency.
KW ratings of M-G sets are given to be used for variable voltage, geared equipment, but sizes of motors listed may,
of course, be used for speeds and load ratings shown for other types of elevator equipment.
For sizes of motors to apply on elevators where ratings are not in the above table, use the following formula:
HP = Elev. Capac. (lb.) x F.P.M.
550 x % Eff.
KW Factor for Gearless: KW = K x T x H
T = Rated Cap. in Thousand
H = FPM in Hundred
K=
1.5 above 3700 Cap.
=
1.77 - 2500 - 3700
=
1.90 - 2000 - 2400
Running Time
Gearless
Geared
Start - Stop
3.6 sec.
4.4 sec.
Run:
FL x 60 sec. = Total R.T. in sec.
FPM
Example:
12.5 x 60 sec. = 1.5 sec.
12.5 x 60 sec. = 2.4 sec
500
350
S-S
3.6 sec.
S-S
4.4 sec.
Total R.T.
5.1 sec.
Total R. T.
6.8 sec.
Previous Page
