The direct start is basically in the starting system, where the motor receives at its terminals, full voltage at the exact moment of departure. The squirrel cage rotor motor can split at full load and with the chain having the capacity to be raised from 4 to 8 times the rated current, according to the type and number of poles.
Electric motors can start directly from the grid only if they meet certain conditions and some of them are:
– the rated capacity of the network must be sufficiently high, making the motor starting current;
– the starting current of the low-value motor due to its low power;
– The starting of the motor must be done without load, which reduces the duration of the starting current, thus reducing the effects on the power system. shaft collars boston
The torque at the start can reach on average 1.5 times the nominal torque and is considered as the simplest starting method in which no specific drive components of the motor are used. Only contactors, circuit breakers or switch switches are applied, which guarantee full voltage supply to the motor at the moment of starting.