The motor service factor (SF: Service Factor) indicates the maximum load rate that allows the motor to work continuously for a long time. It is a parameter used to measure the motor's continuous load working capacity. This value is to meet the overload rate of special applications or working conditions. The value is the ratio of the maximum output power allowed to the rated power. The working condition is the operating mode, and it should not be confused with the capacity factor.

For example: if it is a 50KW motor, if he coefficient service is 1.15, then its actual power is 50×1.15=57.5KW

Common motor working conditions include S1 continuous working condition, S2 short-time working condition, S3~S7 periodic working condition, and uncommon ones include S8 variable speed and variable load continuous periodic working condition and S9 load and speed non-periodic change working condition. When the operating mode does not match any of the standard modes S1~S9 working conditions, if the motor is required to run continuously with variable load, the motor performance can be constrained and characterized by a combination of "S1 continuous working condition + service factor". Although the combination of "duty system + service factor" is actually a duty system, it cannot be said that the service factor is the duty system.

The service factor is a comprehensive indicator, which is numerically equal to the maximum overload rate. According to the operating characteristics of three-phase asynchronous motors, the service factor is generally specified as 1.15-1.25. If a low

service factor is used, there will be no substantial application efficiency; if the service factor is high, the motor operation economy will also be unsatisfactory.

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