1. S1 working mode: also known as continuous working mode, refers to the motor running under constant load until it reaches thermal stability.

2. S2 working mode: also known as short-time working mode, refers to the motor running for a certain period of time, and then the continuous working time needs to be indicated. For example, S2 60min.

3. S3 working mode: called intermittent cycle working mode, the motor runs according to a series of identical working cycles, each cycle includes constant load running time and shutdown and power-off time. For example, S3 25%.

The above three working modes are the basic classifications of motor operation, which define the operation mode and duration of the motor under different loads.

What does the motor working mode S1 S2 S3 S6 mean?

1. S1: Continuous working mode: The running time under constant load is sufficient to achieve thermal stability.

2. S2: Short-time working mode: Running for a given time under constant load, which is not enough to achieve thermal stability, and then the power is off and stopped for enough time to cool the motor again to within 2K of the difference with the cooling medium temperature.

3. S3: Intermittent cycle duty: It runs in a series of identical duty cycles, each cycle includes a period of constant load operation and a period of energy-off stop time. The starting current of each cycle in this duty system will not have a significant effect on the temperature rise.

4. S6: Continuous cycle duty: It runs in a series of identical duty cycles, each cycle includes a period of constant load operation and a period of no-load operation, but there is no energy-off stop time.

60min (S2) duty system refers to short-time duty system. Specifically:

1. Definition

Short-time duty system (S2) means that the motor runs for a given time (60 minutes in this case) under constant load. During this time, the temperature rise of the motor is not enough to reach the thermal stability state, and then it will stop and cut off the energy. The downtime time is enough for the motor to cool down to a temperature difference of less than 2K with the cooling medium.

2. Application background

This duty system is usually used in occasions where intermittent work is required, such as some mechanical equipment that needs to run at high speed for a short time during the processing process, and then stop to cool. Motors using the S2 working system can maintain stable performance and a long service life under such working conditions.

3. Precautions

‌Temperature rise control‌: Under the short-time working system, the temperature rise of the motor needs to be strictly controlled to avoid overheating damage.

‌Shutdown cooling‌: Shutdown cooling time is one of the key factors to ensure that the motor can continue to work stably.

‌Rated power selection‌: The rated power of the motor used for the short-time working system should be selected according to the output power when the actual maximum temperature rise achieved during the specified operating time is exactly equal to the allowable maximum temperature rise.

In summary, the 60min (S2) working system is a motor working system suitable for short-time, intermittent operation. By reasonably controlling the operating time and shutdown cooling time, the stable performance and long service life of the motor can be ensured.