Lenze DSD - Manual (Page 98)

7 Applications
7.5 Rack drive
98
Lenze · Drive Solution Designer · Manual · DMS 4.2 EN · 12/2013 · TD23
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7.5.2.2 Rack and pinion mass
7.5.2.3 Angle of tilt
7.5.2.4 Efficiency, rack/pinion
7.5.2.5 Additional moment of inertia
7.5.2.6 Coefficient of friction of the guide rail
7.5.2.7 Velocity
Symbol Description
m
aux
Mass of rack and pinion (or vehicle weight)
• Incl. the carriage that is moved by the rack.
• The mass is used in the calculation for the moment of inertia
• The mass of the payload is entered separately when the profile is entered.
• By means of the mass calculator an alternative value can be calculated.
Mass calculator ( 405)
Symbol Description
β Angle of tilt (gradient)
• The value can be entered in degrees or as a percentage.
Symbol Description
η
Cog
Efficiency of the rack and pinion and the pinion
Symbol Description
J
add
The additional inertial moment can be, for instance, the pinion or another shaft.
• The proportion of inertia by the payload is calculated separately for a user-definable motion
profile.
• Value can be entered directly or calculated using the inertial calculator.
Inertial calculator ( 407)
Symbol Description
μ
Gdn
By entering the coefficient of friction μ
Gdn
, an increased requirement of the torque due to the
sliding friction in the guide rail is considered.
• With the coefficient of friction the force F
μ
that counteracts the actual direction of move-
ment is calculated.
• If the static friction is to be taken into account for the start-up, the static coefficient of friction
is to be used in this connection.
• Value can be entered directly or selected from the "Physical coefficients" table.
Coefficient of sliding friction
Symbol Description
v Speed (translatory)
• Value is entered in the Motion dimensioning step.