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101

11 Drive Dimensioning

11.2 Motor selection

318

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

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11.2.6 Thermal utilisation

For the calculation of the thermal utilisation, the heating in the motor is simulated by a PT1 func-

tion.

Important quantities for the utilisation A

(t):

• Utilisation of the gearbox via a cycle.

• The utilisation results from the ratio of the instantaneous torque value M(n(t)) and the cor-

responding value M

(n(t)) from the continuous characteristic

• Thermal time constant of the motor.

[11-4] Calculation of the thermal utilisation of the motor via a cycle

[11-5] Diagram of motor: Thermal utilisation

t()

Mnt()()

nt()()

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





Description

 Instantaneous utilisation

 100 % utilisation

• If this limit is exceeded, the motor will be overheated.

 Max. value of the thermal utilisation

 Thermal utilisation

• Simulated value, calculated with the time constant of the motor.

 Performance features

• The performance features can also be found in the selection table. Selection table

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