Status Quo and Energy Consumption Performance of Motor Energy Efficiency Grades

The energy saving of electric motors has been listed as one of the top ten energy-saving projects by the relevant national departments. As energy conservation has become a global focus, the energy efficiency of electric motors has also become a concern. In order to meet the challenge of energy efficiency, governments of various countries have successively issued various regulations to improve energy efficiency. Since the official implementation of the "Energy Efficiency Standard for Small and Medium-sized Three-Phase Asynchronous Motors (GB18613-2006)", my country's motor energy efficiency labeling work has made great progress.

Status Quo of Energy Efficiency Grades of Chinese-made Electric Motors

At present, the products of most three-phase asynchronous motor companies in the country are third-class, and only a few products are second-class. The Y series and Y2 series motors that are widely used in my country basically meet the energy efficiency of the national standard GB18613-2002. According to the requirements of the limit value, the efficiency level of the motor can reach the EFF2 level according to the EU standard.

In order to promote the realization of energy saving and emission reduction targets, in 2006 the state formulated the GB18613-2006 standard, which divided the energy efficiency grades of small and medium-sized three-phase asynchronous motors into 1, 2 and 3 energy consumption indicators. Among them, the energy consumption of level 1 is an ultra-high-efficiency motor, which is consistent with the NEMAE standard, with an average efficiency of 93.33%; the average efficiency of level 2 is 89.75%, which is consistent with the EU EFF1 standard, which is a high-efficiency motor; the average efficiency of level 3 is 86.35%, which is consistent with EU EFF2 The standard is consistent, which is the current motor efficiency standard. The implementation of national energy standards is to further promote the development of high-efficiency products. .

The energy consumption performance of the motor

First, the motor load is low. Due to the large amount of surplus, improper selection, changes in production processes, etc., the actual working load of the motor is far less than the rated load. The motor with an installed capacity of about 30 runs at a rated load of about 30, and the operating efficiency is too low.

Second, the power is too low or the power is asymmetrical. Due to the unbalanced single-phase load of the three-phase four-wire low-voltage power supply system, the motor and the motor produce ordered torque, the three-phase voltage is asymmetric, the loss of the ordered motor is increased, and the three-phase voltage of the ordered motor is increased. In addition, for a long time, the voltage of the power grid has been low, which makes the normal working motors and currents larger, resulting in increased power consumption. Therefore, the higher the three-phase voltage asymmetry, the lower the voltage will be.

Third, maintenance management is not in place. Some units do not maintain and maintain the motor and equipment as required, which makes the loss continue to increase.

Fourth, old (obsolete) motors are still in use. These motors use class E insulation, are bulky, have poor starting performance, and are inefficient. Despite the annual remediation, there are still many places in use.

At present, my country's small and medium-sized three-phase asynchronous motors account for about 17% of exports. If they follow the old ways and do not catch up, the gap in the energy efficiency of motors will become larger and larger, and it will be difficult to improve the international competitiveness and expand the international market. Under the good situation of vigorously urging all over the country and all small and medium-sized enterprises to accelerate technological innovation, the promotion of high-efficiency motors in my country is imperative.