Which High Efficiency Motor Is More Suitable For High Load Rate And Constant Torque Loads?

Selecting a more economical and reasonable system energy-saving solution to achieve optimal system energy utilization, through comprehensive analysis and evaluation of different equipment, operating conditions and motor load characteristics, is a motor energy-saving technology worthy of in-depth research.

Objectively speaking, the energy-saving performance of a single motor is of great importance, but the final system energy-saving effect may not be ideal if the driven equipment and operating conditions are ignored.

For working conditions with high motor load rate (over 0.5) and long running time under constant torque loads, ordinary power frequency high-efficiency motor is sufficient. This configuration not only features relatively low cost, but also ensures a favorable energy-saving effect.

Motor load rate refers to the ratio of the average load to the rated load. Motor energy conservation requires improvement in both operational efficiency and power factor. Considering the impacts of these two aspects, the optimal operating condition is achieved when the load rate is controlled within the range of 0.78–0.88. When the load rate drops below 0.45, the high efficiency motor's operational performance will deteriorate drastically, which is a typical case of "an oversized motor driving an underloaded device", referred to as the "light-load" state.

In accordance with China's energy efficiency control regulations for general squirrel-cage three-phase asynchronous motors, as specified in the energy efficiency limit requirements of GB18613, the IE3 energy efficiency class is currently the minimum limit for this type of motor, corresponding to the national Level 3 energy efficiency standard. Meanwhile, a small number of reputable motor manufacturers have developed and launched YE4 and YE5 motors onto the market. The YE4 motors meet the national Level 2 energy efficiency standard, while YE5 motors reach the national Level 1 energy efficiency standard. In particular, the energy efficiency of YE5 motors has attained the top level specified in the IEC standards.

Compared with other series of high-efficiency energy-saving motors, this motor series boasts a wide range of applications. Customers only need to make a relatively small overall investment in energy-saving retrofits, without compromising the final energy-saving effect.

It is important to note that when selecting such energy-saving High-Efficiency motor, customers must purchase products from regular brand-name motor manufacturers to prevent unexpected adverse consequences.