Main Hoist Motor Power Calculations

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MAIN HOIST MOTOR POWER CALCULATIONS

type of crane

single girder indoor EOT crane

main hoist

150

class of duty

class-II M5

design standards

IS 3177

span bay length

tonnes IS 807

19

m

100

m

crane weight

50

crab weight

5

IS 800

tonnes

AS PER ANNEX-c CLAUSE - 'cl' OF IS :3177 Safe working load

swl

150

tons

weight of attachements

wt_att

0.5

tons

specified speed

V_hoist

Duty factor for specified class of duty

Cdf_hoist

number of pairs of gears

n

3

total number of rototaing sheaves passed over by each part of the moving rope attached to the drum

m

1

service factor for vertical motion depe nding on type motors

Cv

0.67

derating factor for ambinet temperature

Camb

combine efficiency of gears and sheaves

E

1

assumed

m/min

1.5

for M5 IS-3177 refer table-2, page no

for ac motors for 40 oC

1 0.946115

for hardened profile ground and oil s

motor power required

26.12205

KW

considering 10% as margin motor KW required is

28.73425

KW