The service factor of an engine represents a power reserve that it has and can be used on a continuous basis, and this type of scheme is also called the S1 regime, in accordance with national and international standards. The power that can be achieved from the motor is thus the nominal power, which is indicated on the plate, multiplied by the service factor. A power motor of 5 kW and with a service factor of 1.15 can work continuously with 5 ⋅1.15 = 5.75 kW in continuous mode.
When a service factor is not shown, it means that the engine has no power reserve. When the power actually used corresponds to the rated power multiplied by the service factor, a temperature rise of 100º C should be allowed in addition to the temperature limit of the insulation class of the motor. According to the standards, when the service factor is used, they may also have changes in some of the characteristics of the engine, such as power factor and efficiency. However, the starting torque, the maximum torque and the starting current must not change. best prices for skf bearing