Applications of the 3-phase asynchronous motor
Thanks to their robust and simple design and low-maintenance operation, 3- phase asynchronous motors are used in large numbers in commercial applications, trade and industry.
Problem
If switched on directly, the typical current and torque behavior of the 3-phase asynchronous motor may negatively influence the feeding supply network and the load machine during start-up.
Starting current
3-phase asynchronous motors have a high direct starting current I(starting).
Depending on the motor version, this current may be 3 times to 15 times the size of the rated operating current. A typical value is 7 to 8 times the size of the motor rated current.
Disadvantage
This results in the following disadvantage
• Higher load on the electrical supply network. This means that the supply network must be dimensioned for this higher output during motor start-up.
Start torque
The start torque and the stalling torque can usually be assumed to be between 2 and 4 times the rated torque. For the load machine, this means that the starting and acceleration forces in relation to rated operation result in increased mechanical load on the machine and the conveyed material.
Disadvantages
This results in the following disadvantages
• Higher load on mechanical parts of the machine
• Higher costs because of application wear and maintenance
The current and torque behavior during start-up can be optimally adapted to the requirement of the application using the SIRIUS 3RW44 electronic soft starter
Solution The current and torque behavior during start-up can be optimally adapted to the requirement of the application using the SIRIUS 3RW44 electronic soft starter.
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