An AC motor switched directly on to the mains power supply will struggle to reach ist nominal speed as quickly as possible.  This draws maximum current from the power supply and accelerates the application with its maximum torque. Depending on the application, this can cause different problems.

Applications like pumps, conveyers, centrifuges and bandsaws must be started slowly, and sometimes stopped slowly, to prevent mechanical shocks such as water hammer, and strains on brands, couplings and shafts.

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