What is the significance of promoting energy efficiency in motors?

At present, many countries need to replace the traditional method of flow control, pressure control frequency control equipment, China is also active, efficient, energy-saving motors, boilers, encouraged by industrial enterprises, the use of furnaces, fans, pumps and other equipment.

The motor is a high energy-consuming device with wide coverage and wide application. According to statistics, China's motor energy consumption accounts for 60 to 70% of industrial electricity consumption. The actual application and foreign countries compared to the gap is large, the overall health of the motor, the unit efficiency of about 75%, about 10% lower than abroad, 30 to 40% lower than the international advanced level of 20 to 30%, the operating efficiency is low. Therefore, China's motor application has a great potential for energy saving, energy saving on the motor is critical.

First, the current situation of motor energy consumption

Reform and opening up over the past 20 years, China has achieved "double GDP, double energy consumption" results. However, compared with developed countries, China's power utilization efficiency is still low, especially in industrial appliances, consume a lot of energy and waste. Many industrial equipments such as fans, water pumping equipment, traditional industrial sewing machines, mechanical equipment, etc. are mainly driven by AC motors with constant speed, and the efficiency of AC motors is generally low.

Fans use close to the dampers to regulate the flow, pumps and equipment, this regulation method is simple, but at the cost of energy consumption, so in industrial sewing machines, processing equipment, often use the clutch to use, friction linings to regulate speed, resulting in a large number of standby losses and braking energy consumption.

1, fans, pumping equipment

In industrial production, processing and manufacturing products, control and regulation of furnace pressure, wind speed, air volume, temperature, etc., according to the production needs, such as drying, cooling, ventilation, etc., the main boiler combustion turbine system equipment to adapt to the process requirements and operating procedures. The most common control method for erosion conditions is to regulate the controlled object by adjusting the size of the damper and the opening of the baffle. As a result, the fan must run at maximum speed regardless of production requirements and cannot be adjusted for changes in operating conditions, wasting large amounts of energy. In the production process, there is not only control accuracy, but also limited manufacturing accuracy and increased manufacturing costs, resulting in equipment consumption, shortened equipment life, equipment maintenance and high maintenance costs.

The production of pump equipment also provides a wide range of applications, pumping stations, storage tank systems, sewage outlets, with industrial water (oil), circulation systems, heat transfer systems, centrifugal pumps, axial flow pumps, gear pumps, piston pumps and other equipment. Regulating valves, return valves, globe valves and other throttling devices are commonly used to control flow, pressure, water level and other signals, depending on various production requirements. This not only damages the quality of useless energy, piping, valves, etc. sealing capacity, affecting the quality of production, endangering the product, and serious damage to the pump chamber, valve wear and cavitation, equipment accelerated.

2, industrial sewing machines, machining equipment

Traditional industrial sewing machine motor is an AC motor clutch, the efficiency is only 40 to 50%, regardless of whether the motor is working, the thickness of the cloth sewing, always output full power, if the load motor is released by the clutch and continue to run, it is expected to be a standby machine. Large standby losses occur when running without a load.

In addition to often intermediate and low-processing machines, friction is utilized to generate a large amount of braking energy and reduce motor speeds for speed regulation purposes, adjusting the friction plate to a variable friction plate. Not only used to reduce the motor, accelerate the motor shaft wear life expectancy.

At present, in the consumer electronics industry gradually introduced frequency control technology to reduce energy consumption at the same time, many industrial control areas of speed regulation methods are limited to the traditional level of technology. The U.S. Department of Energy data show that industrial users can replace the old electrical equipment by using the latest high-efficiency electrical equipment and specialized frequency converters to save at least 18% of the energy on the existing standard.

At present, many countries need to replace the traditional methods of flow control, pressure control variable frequency speed control equipment, China is also active, high-efficiency, energy-saving motors, boilers, encouraged by industrial enterprises, the use of furnaces, fans, pumps and other equipment.

Second, the use of electronic information technology to change the traditional industry to achieve energy saving and consumption reduction

With the development of electronic technology and information technology, the application of electronic information technology in products is becoming more mature, the combination of traditional motor technology and electronic information technology, contributing to the development of "mechatronics". cts. mechatronics, also known as "mechatronics". The organic synthesis of "mechatronics" is the introduction of electronic technology in the general terminology of the main functional mechanisms, motor functions, information processing functions and control functions, mechanical equipment and other electronic equipment and software. System composition. Mechatronics "motor" and the traditional motor has a qualitatively different, "mechatronics" motor controller includes both the controller, including embedded software and drive the motor part, which combines the control of fuzzy intelligent system, that is, the use of software. This intelligent fuzzy control not only effectively improves the operating accuracy of the system, but also adjusts the output speed and output of the motor in real time according to the changes in the system load, in order to achieve the purpose of energy saving. Here are two examples of the use of "mechatronic" motors.

1、Energy-efficient servo control motors in the field of industrial sewing machine applications

The above traditional industrial sewing machine motor for the AC motor clutch, the efficiency is only 40 ~ 50%, regardless of whether the motor is running, the thickness of the cloth sewing always output full power, if the load is released by the clutch clutch MO, the standby machine. tor and operation in the absence of a load continues to carry out the situation, it is expected to be larger standby loss. Energy-saving brushless DC motor as a servo motor control and drive elements, including 70% to 80% efficiency, embedded software servo control system, the system always detects the thickness of the sewing fabric thickness of the built-in software real-time information as a standby of the machine, the system is EXP. when not working at the time of shutdown, the software always keeps the motor working in the most reasonable, energy-saving state, motor output speed and output power regulation. Energy-saving AC communication clutch motor used in the field of industrial sewing machines, servo motor control field of energy saving 50 to 60%, each machine can save 576 kWh / year, which is a sewing machine industry organizations, it is presumed that C. Currently in production of energy-efficient servo control motors, with more than 2 million industrial sewing machines, can save 1,150 million kWh / year.

Energy-saving motor servo control not only saves more than 30% of the general application of industrial machinery effect, but also replace the traditional AC motors, mechanical equipment and industrial dust collectors.

2, frequency conversion motor in the fan / pump device applications

As the pump fan in the device's power consumption in response to changes in operating conditions, it is not an equal-speed AC motor output, as large as the country's power consumption, but rather 1/4 years of self-regulation wasted a lot of power consumption. The rise of frequency conversion speed control technology, at the end of 1980, a new generation of high-speed electric drive technology, easy to operate, easy to communicate, small size, light weight, high torque, high precision, high functionality, high reliability, superior to the speed control (variable pole speed control). Voltage-adjusted speed regulation, sliding speed regulation, etc.). Variable frequency speed control operation is based on changes in load speed, changes in power supply current frequency and voltage adjustment to obtain suitable motor operating conditions. High operating efficiency is maintained at different speeds. In addition to being able to improve the application of frequency control technology, reduce power consumption and start-up performance, but also to protect the electric load equipment from the transient impact of the shock, to extend its service life, and the motor is more accurate.

Fans, pumps and other equipment using variable frequency speed control technology has attracted widespread attention from the government, energy-saving driving to achieve energy-saving technology priority as the focus of the "People's Republic of China Energy Conservation Law" to promote universal technology, go ahead. In fact, frequency conversion motor drive control of fans and pumps has a significant power saving effect, the general power saving rate of 30% to 50%.