Lenze DSD User Manual download pdf (Page 124)

100

101

7Applications

7.9 Hoist drive with counterweight

124

Lenze · Drive Solution Designer · Manual · DMS 4.2 EN · 12/2013 · TD23

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Stationary torque

The stationary torque is calculated from the difference of the masses assessed with the reeving.

[7-98] Equation 6: Stationary torque

 Tip!

The mass of the cables usually can be disregarded, since the force due to weight of the ca-

bles cancels itself out in the case of a pulley block.

For some applications the cable mass in the most unfavourable position of the hoist is quite

important (e. g. in the case of great lifting heights), so that it can be considered as the active

cable mass m

acv,Rop

For the drive the stationary torque, also on the pulley block, is only the mass of a simple ca-

ble, since the masses of the other cables cancel themselves out by the fixed cable rolls. The

cable mass for the counterweight can be deducted.

Ascertainment of the active cable mass

The active cable mass is ascertained by means of the mass calculator (field: cylinder) and is calculat-

ed with the following equation:

[7-99] Equation 7: Active cable mass for the stationary torque

sds

2000

-------------

add

-------







⋅

Cbn

-------------

Ctw

------------- -

– m

acv,Rop

++ +













⋅=

acv,Rop

Rop

Δh10π

Rop

200

-----------





⋅⋅⋅⋅=

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