Käivitusmomenti

Käivitusmomenti, also known as starting torque or breakaway torque, refers to the maximum torque produced by an electric motor at the moment it begins to rotate from rest. This is a critical parameter for applications where a motor needs to overcome inertia or a static load to initiate movement. It is often higher than the motor's rated torque, which is the torque it can sustain during continuous operation.

The käivitusmomenti is influenced by several factors including the motor's design, its windings, the applied voltage, and the current flowing through the motor. For instance, DC motors generally exhibit high starting torque due to their design. AC motors, particularly induction motors, have their starting torque determined by their rotor resistance and reactance.

Understanding käivitusmomenti is essential for selecting the correct motor for a specific task. If a motor's käivitusmomenti is insufficient, it may fail to start under load, leading to stalled operation or even damage. Engineers consider this value when sizing motors for applications such as conveyors, pumps, cranes, and industrial machinery that require significant force to overcome initial resistance. Load inertia, friction, and any pre-existing mechanical loads all contribute to the total starting torque requirement.