Direct starting is the starting system in which the motor receives full voltage at its terminals at the moment of starting. The cage rotor motor can break at full load and with the chain rising from four to eight times the rated current, depending on the type and number of poles. The conjugate in the match reaches about 1.5 times the nominal conjugate Gates A39 Hi-Power II Belts. This is the simplest starting method, where no special motor drive devices are used. Only contactors, circuit breakers or switch switches are used to allow the motor to be supplied with full voltage at the moment of starting. Motors can only start directly from the grid when we meet the following conditions:
– the rated capacity of the network is satisfactorily high, making the motor starting current irrelevant;
– the load to be moved requires slow and progressive drive;
– the motor starts without load, which reduces the duration of the starting current and, consequently, attenuates the effects on the power system.
– the power of the engine is higher than the maximum allowed by the local concessionaire, normally established at 7.5 bhp;
– The starting current of the motor is small because its power is low.