working system  

 1, the working system definition: that exposure to a range of motor load conditions, including starting, no load, parking and off to its duration and sequencing.  

 One no-load: means the electric power output in a zero spin state.  

 Full load: means the motor running in its fixed state.  

 Be able to stop and break: refers to neither electrical in movement, nor electricity or mechanical energy input state.  

 2, the working system of the type: working system can be divided into continuous, short-term, periodic or nonperiodic several types.  

 Periodic working system includes one or more of the provisions of the duration of constant load, and the electrical load during operation does not meet the thermal stability; aperiodic work system in the load and speed are usually allowed to run in the range.  

 Work system, code-named general use S1 ~ S10 to indicate the following a brief few, we compare the system of the type commonly used in the work.  

 3, S1 working system: continuous work system; to keep running at a constant load to the thermal stability.  

  4, S2 working system: short-term work system; at a constant load according to the given time to run the motor at the time, not enough to achieve thermal stability, with the attendant parking and off energy, their time enough to cool the motor again.  

 S2, after-work system should be marked with the duration should be given priority 10,30,60, or 90 minutes.  

 As shown above.  

 5, S3 working system: intermittent-cycle-work system; by a series of the same work cycle of operation, with each cycle including a constant-load running time and a period of time to stop and break, and the electrical load during operation failed to meet the thermal stability.  

   S3 should be marked with the load after the sustained rate of tP / (tP + tR).  

 2, fixed and ratings  

 1, fixed refers to a group rating and operating conditions.  

 Fixed categories are: the amount of continuous work to develop the work of the system corresponding to the S1  

 Short-time working to develop a corresponding amount of work in the S2 system  

 Cycle of work to develop the amount corresponding to S3 ~ S8 working system  

 The amount of non-periodic working to develop the work of the system corresponds to S9  

 Discrete constant-load work to develop a corresponding amount of work on the S10 system  

 2 rating means a motor running condition characterized by a variety of values, such as we have seen in the nameplate power, voltage, current, frequency, speed and so called rating. (Can be brief frequency, voltage, speed, etc. with the provisions and terms)  

 3, operating conditions  

   Field conditions: 

(1) not more than 1000m above sea level  

(2) Maximum ambient air temperature of not greater than 40 degrees  

(3) Minimum ambient air temperature is higher than 15 degrees below zero  

(4) Cooling medium temperature is greater than 5 degrees less than 25 degrees  

   Electrical conditions: 

(5) power supplies comply with standard requirements  

(6) The voltage and current waveforms required symmetry  

(7) changes during the operation voltage of <± 5%, frequency changes <± 1%.