15T x 20m Span x 10.2 Lift
DG EOT Crane
Selection of Main Hoist Motor & Brake
Mechanical Rating Required in KW :
M x V x Cv x Cdf
6.12 x E
Where :
Rated load =
Weight of hook block =
Weight of wire rope =
M = Mass of the rated load plus weight of the hook block & wirerope:
15.0 T
0.50 T
0.46 T
15.96 T
8 m/min
V = Specified Hoisting Speed:
Cv = Service facor for vertical motion for ac motor:
0.67
Cdf = Duty Factor Of Hoisting Mechanism for Class M8 of Crane:
1.7
Camb = Derating Factor for the required ambient Temperature (50°C):
0.88
E = Combined Efficiency Of Gears & Sheaves:
( 0.95n) x ( 0.99 m )
=
0.83
where:
0.95 = Efficiency of Gear Pair per Stage
= 3
n
= No of Gear Pairs
m
= Total No. of Rotating Sheaves passed by each part of the
3
moving rope attached to the drum =
0.99 = Efficiency of Rotating Sheave
Mechanical Rating Required in KW
15.96 x
6.12 x
x
8
0.83
0.67 x 1.7
=
28.56 KW
Electrical power rating required in KW
= Mechanical rating
Camb
=
28.56
0.88
=
32.46 kW
Motor rating at 40°
Type: Squirrel Cage
Motor Kilo Watt =
Make:
37 KW
Siemens
Starts/ Hr: 300
Frame:
TEFC, 60% CDF, S4 Duty, IP55, 6 Pole, 1000rpm (SYN), CL-F, B3, Single Shaft Extension.
15T x 20m Span x 10.2 Lift
DG EOT Crane
Brake
Min. Braking Torque Required As Per IS
= 150 % of the Rated Torque Transmitted to the Brake Drum from the suspended
Maximum Safe Load and the Brake not being taken into consideration
Min. Braking Torque required =
Type: DCEM
Make:
BCH
Torque Capacity =
74.6 KGM
(1.5 x
28.56
x 716) =
(750 x 0.746)
Qty: 1
Shoe Type
Drum Diameter: Ø300
54.83 KGM
15T x 20m Span x 10.2M Lift
DG EOT Crane
Selection of Cross Travel Motor & Brake
Mechanical Rating Required in KW :
MVSCdf
(1100a)
x
F +
6117TCamb
981N
Where :
Rated load =
Weight of the Crab =
M = Mass of Moving Load (Weight of Crab+Weight of Rated Load)
15.0 T
3.0 T
18.0 T
20 m/min
V = Specified travel Speed in M/Min:
S = Service Factor For Providing Adequate Motor Heat Dissaption Capacity:
1.06
Cdf = Duty Factor for Horizontal Motion of Class M8 duty:
1.5
F = Overall Friction Factor for Wheels on Antifriction Brgs in KG./Tonnes:
8
a = Average Linear Acceleration Trolley in cm/s2:
10 cm/s2
N = Resultant Mechanical Efficiency of the Drive:
0.86
T = A Factor Taken For Average Torque By The Motor:
1.7
Camb = Derating Factor for the required ambient Temperature (50°C):
0.88
Mechanical Rating Required in KW
18
x
20
6117
x
x
=
1.06
1.7
x
1.5
x
8
+
1100
x 10
981 x 0.86
1.16 KW
Electrical power Rating Required in KW
= Mechanical rating
Camb
=
1.16
0.88
=
1.32 kW
Motor rating at 40°C:
Squirrel Cage
Type:
Motor Kilo Watt =
Make: Siemens
1.5 KW
Starts/Hr: 150
Frame:
TEFC, 60% CDF, S4 Duty, IP55, 6 Pole, 1000rpm (SYN), CL-F, B-3, Single Shaft Extension.
15T x 20m Span x 10.2M Lift
DG EOT Crane
Brake
Min. Braking Torque Required As Per IS
= 100 % of Motor Torque
Maximum Safe Load and the Brake not being taken into consideration
Min. Braking Torque required =
DCEM
Type:
Torque =
1.16
x 716) =
(1.0 x
(960.00 x 0.746)
Make: BCH
8 KGM
Shoe Type
Drum Diameter: Ø160
1.16 KGM
15T x 20m Span x 10.2M Lift
DG EOT Crane
Selection of Long Travel Motors & Brakes
Mechanical Rating Required in KW (for twin drive):
MVSCdf
(1100a)
x
F +
6117TCamb
981N
Where :
Rated load =
Weight of crane =
M = Mass of Moving Load (Weight of Crab+Weight of Rated Load)
15.0 T
7.0 T
22.0 T
V = Specified travel Speed in M/Min:
50 m/min
S = Service Factor For Providing Adequate Motor Heat Dissaption Capacity:
1
Cdf = Duty Factor for Horizontal Motion of Class M8 duty:
1.5
F = Overall Friction Factor for Wheels on Antifriction Brgs in KG./Tonnes:
8
a = Average Linear Acceleration Trolley in cm/s2:
25 cm/s2
N = Resultant Mechanical Efficiency of the Drive:
0.86
T = A Factor Taken For Average Torque By The Motor:
1.7
Camb = Derating Factor for the required ambient Temperature (50°C):
0.88
Mechanical Rating Required in KW
22
x
50
6117
x
x
=
1
1.7
x
1.5
x
8
+
1100
x 25
981 x 0.86
4.25 KW
Electrical power Rating Required in KW
= Mechanical rating
Camb
=
4.25
=
4.83 kW
0.88
Motor rating at 40°C:
Squirrel Cage
Type:
Motor Kilo Watt =
Make: Siemens
5.5 KW
Starts/Hr: 150
Frame:
Qty:
2Nos.
TEFC, 60% CDF, S4 Duty, IP55, 6 Pole, 1000rpm (SYN), CL-F, B-3, Single Shaft Extension.
x 0.66
15T x 20m Span x 10.2M Lift
DG EOT Crane
Brakes
Min. Braking Torque Required As Per IS
= 100 % of Motor Torque
Maximum Safe Load and the Brake not being taken into consideration
Min. Braking Torque required =
DCEM
Type:
Torque =
4.25
x 716) =
(1.0 x
( 960.00 x 0.746)
Make: BCH
8 KGM
Shoe Type
Drum Diameter: Ø160
4.25 KGM
Qty: 2Nos.
0