|First condition for choosing of the suitable
motor should be an analysis
of the estimated load:
Case 1: Continuous operation
|Case 2: Interval operation
In interval operation the value of the surface below the load graph of the motor is important.
The effective torque is calculated with the well known formula as follows:
For the effective current applies accordingly:
Momentary current and torque may reach twice the values of those during continuous operation. The effective values calculated with the formulas shown above must not exceed the values of the continuous current shown in the tables.
Case 3: Peak operation
Round table operation is a typical example for peak operation. Here acceleration and deceleration may increase up to triple continuous torque because between the peaks hardly any power is necessary. Also in this case the effective values must not exceed the values of the continuous operation.
Depending on motor temperature the permanent magnets come into danger of demagnetisation. Therefore similar applications and the choice of the suitable motor should be discussed with our engineers.
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