The power rating is what mean

 I have a power supply,which rated 300 permanent magnet motor w,could you tell me the power supply is the maximum power of 300 w?Or just the general power supply is 300 w?I am afraid that the power of www.facebook.com/guohong.trading the computer after upgrade enough!Rated power refers to the power provided by the power supply can work stably for a long time,if the power supply in the long run under the rated power,the power supply itself will not cause any problems.If more than the diesel generators prices power,short running is not for the power supply is no problem,but if ac electric motor go down for a long time,can produce a certain amount of loss to the power supply.