High-efficiency energy-saving motors can actually save so much electricity!-Xinda Motor- electric motors and EV accessories supplier|INDEX--

High-efficiency energy-saving motors can actually save so much electricity!

Date：2024-05-28　　　Author：XINDA MOTOR

High-efficiency motors refer to motors with higher efficiency, and their efficiency values can reach the second level of GB18613-2012 standard. High-efficiency motors use new motor designs, new processes and new materials to improve output efficiency by reducing the loss of electromagnetic energy, thermal energy and mechanical energy. Compared with standard motors, their efficiency is increased by 4% on average.

In May 2020, China announced the latest motor energy efficiency standard "GB18613-2020 Electric Motor Energy Efficiency Limits and Energy Efficiency Grades" . The standard will be officially implemented on June 1, 2021. Energy efficiency motors below IE3 (international standard) will be forced to stop production , and the domestic motor industry will fully enter the IE3 high-efficiency era.

The new national standard also stipulates that from the date of implementation of the standard, IE3 efficiency will become China's lowest three-phase asynchronous motor energy efficiency limit value (three-level energy efficiency), and three-phase asynchronous motors (such as YE2 series motors, etc.) with energy efficiency limits lower than IE3 will not be allowed to be produced and sold, indicating that the efficiency level of China's small and medium-sized three-phase asynchronous motors has been raised to a higher level. The new national standard also lists IE4 efficiency as a second-level energy-saving evaluation value indicator.

The difference between motor energy efficiency labels after the implementation of the new national standard GB 18613-2020 is as follows:

As far as motor companies are concerned, from June 1, 2021, motors that do not meet the IE3 energy efficiency limit shall not be produced or sold, and users shall not purchase them . Therefore, motor companies must be fully prepared to produce and sell IE3 and above energy efficiency motors in terms of technology, equipment, process, materials and sales.

Compared with IE2, the cost of IE3 is about 20% higher; compared with IE3, the cost of IE4 is also significantly higher. Therefore, motor companies should tap the potential in design, process and other aspects to reduce costs, on the premise that their products meet the required energy efficiency indicators. Currently, many motor companies have begun to implement intelligent manufacturing, so that motor products can achieve a higher consistency. In addition, existing motor products can be better improved in terms of process (such as processing accuracy) and equipment.

Energy-saving measures for high-efficiency motors

Measures to improve the efficiency of electric motors. Energy saving of electric motors is a systematic project, involving the entire life cycle of electric motors, from the design and manufacture of electric motors to the selection, operation, adjustment, maintenance and scrapping of electric motors. The effect of energy saving measures should be considered from the entire life cycle of electric motors. In this regard, domestic and foreign countries mainly consider improving the efficiency of electric motors from the following aspects.

The design of energy-saving motors refers to the use of modern design methods such as optimization design technology, new material technology, control technology, integration technology, and test and detection technology to reduce the power loss of the motor, improve the efficiency of the motor, and design a high-efficiency motor.

While converting electrical energy into mechanical energy, the motor also loses some energy. Typical AC motor losses can generally be divided into three parts: fixed loss, variable loss, and stray loss. Variable loss changes with the load, including stator resistance loss (copper loss), rotor resistance loss, and brush resistance loss; fixed loss is independent of the load, including core loss and mechanical loss. Iron loss is composed of hysteresis loss and eddy current loss, which is proportional to the square of the voltage, and hysteresis loss is inversely proportional to the frequency; other stray losses are mechanical losses and other losses, including bearing friction loss and windage loss caused by the rotation of fans and rotors.

for example:

A company previously used ordinary 7.5KW Y series motors, with a total of 10 units operating simultaneously, running 8 hours a day, 300 days a year. This year, the company upgraded its equipment and replaced 10 YX3-132M-4P-7.5KW motors. The power is still the same, but it saves a lot of electricity.

For the same power of 7.5KW, the efficiency of ordinary Y motor is 87%, and the efficiency of high-efficiency energy-saving motor is 90.1%, so throughout the year:

◆ The power consumption of Y-132M-4P-7.5KW in one year is: (7.5/0.87)*8*300=20,689.6 kWh

◆ The power consumption of YX3-132M-4P-7.5KW for one year is:

(7.5/0.901)*8*300=19,977.8 degrees

◆ After using high-efficiency energy-saving motors, one unit can save electricity for the whole year: 20689.6-19977.8=711.8 degrees

The company uses 10 7.5KW high-efficiency energy-saving motors, which can save 7118 kWh of electricity per year!

High-efficiency energy-saving motors can actually save so much electricity!

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