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قديم 09-06-2011, 05:09 AM   رقم المشاركة : [1]
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افتراضي What is the meaning of Duty in electrical drives?



IEC 60 034-1:

*S1 : Continuous running duty.The motor works at a constant load for enough time to reach temperature equilibrium.
S2 : Short-time duty.
Operation at constant load for durations of 10, 30, 60 and 90 min are recommended. After each operating period, the motor has to be de-energised for a sufficient duration until the windings are cooled to ambient temperature.
S3 : Intermittent periodic duty.
The starting current does not significantly affect the temperature rise.
Duty cycle is 10 min unless otherwise agreed.
Cyclic duration factor of 15%, 25%, 40% and 60% may be considered.
S4 : Intermittent periodic Duty with starting.
Starting has influence on temperature rise of windings.
Starting load-torque (N), number of starts per hour, cyclic duration factor and factor of inertia (Fl) have to be given.
S5 : Intermittent periodic duty with electric braking.
Starting and brakings have influence on temperature rise of windings.
Starting load-torque (N), number of starts per hour, cyclic duration factor and factor of inertia (Fl) have to be given.
S6 : Continuous-operation periodic duty.
There is no temperature rise when the motor is loaded at its rated output.
Duty cycle is 10 min unless otherwise agreed.
Cyclic duration factor of 15%, 25%, 40% and 60% may be considered.
S7 : Continuous-operation periodic duty with electric braking.
Brakings have influence on temperature rise of windings.
Load and factor of inertia (Fl) at the operating period have to be given.
S8 : Continuous-operation periodic duty with related load/speed changes.
Brakings have influence on temperature rise of windings.
Load, cyclic duration factor and factor of inertia (Fl) for each speed at the operating period have to be given.
S9 : Duty with non-periodic load and speed variations.
Brakings have influence on temperature rise of windings.
Load and factor of inertia (Fl) for each speed have to be given.



Cyclic duration factor is the ratio of the period of loading, including starting and electrical braking, to the duration of the duty cycle and is expressed as a percentage.


Factor of inertia (Fl) = JM =Jz
JM


JM : Moment of inertia of the motor (kgm2)
Jz Total moment of inertia of driven machine and parts as couplings etc... referred to motor shaft (kgm2)

The nature of braking, whether mechanical or electrical (D.C. or reversed current) has also to be stated.
The ratings and performance data given in this catalogue,are for continuous running at constant load for a sufficient duration to reach thermal equilibrium which correspond to duty type SI.
However, standard range motors may be operated at all the other duty types, provided that the limit of permissible temperature rise is not exceeded.




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What is the meaning of Duty in electrical drives?


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