General motor: The motor is a device that converts electromagnetic energy into mechanical kinetic energy. 70%-95% of the electromagnetic energy digested and absorbed by the motor is converted into mechanical kinetic energy. This is often said to be the high efficiency value of the motor. It is a key performance index of the motor. The other 30%-5% is partly consumed by the motor itself due to burning, mechanical equipment wear, etc., so the electromagnetic energy is consumed.

High-efficiency motor: The motor with high electromagnetic energy utilization rate is called high-efficiency motor, commonly known as "high-efficiency motor".

For general motors, it is not very easy to improve the high efficiency by one point. The raw materials may be improved a lot, and when the high efficiency of the motor reaches a certain standard value, no matter how many raw materials are improved, they cannot be improved. The vast majority of high-efficiency motors on the market today are upgraded products of three-phase asynchronous motors, in other words, the basic principles have not changed.

High efficiency motor key according to the following ways to improve the high efficiency of the motor.

1. Lifting raw materials: Increase the diameter of the iron core, increase the length of the iron core, expand the slot specification of the stator of the motor, and increase the net weight of the copper core wire to achieve the purpose of improving work efficiency. For example, the diameter of the Y2-8024 motor will be increased from φ 120 to φ 130, some overseas will be increased from φ 145, and the length will be increased from 70 to 90. Each motor uses 3Kg of iron. Copper core wire lifting 0.9Kg.

2. Ferrite cores with good magnetic energy are selected. In the past, hot-rolled sheets with large iron loss were used, but now high quality cold-rolled sheets with low iron loss, such as DW470. Even lower DW270.

3. Improve the processing accuracy, reduce the loss of mechanical equipment, disassemble and replace small electric fans, reduce the loss of cooling fans, and select high-efficiency rolling bearings.

4. Carry out reliability design for the electrical technical parameters of the motor, and carry out the improvement of the main parameters according to the change of the groove shape.

5, the selection of copper cast motor rotor (processing technology complicated, cost increase).

Therefore, to make a real high-efficiency motor, in the design, raw materials, production and processing levels are higher than many costs, can make the power engineering larger level of conversion into mechanical kinetic energy.

Environmental Protection and Energy Saving Countermeasures of High Efficiency Motor

Motor environmental protection and energy saving is an automatic control, which involves the service life cycle time of the motor. From the design scheme, production and manufacturing of the motor to the model selection, operation, adjustment, maintenance and damage of the motor, the actual effect of its environmental protection and energy saving countermeasures should be considered from the whole service life cycle time of the motor. In these aspects, all countries in the world should take into account the improvement from the following aspects to improve the work efficiency.

The design scheme of environmental protection and energy saving motor refers to the application of reliability design technology, new decoration material technology, control system, integrated technology, material detection technology and other modern design methods to reduce the output power loss of the motor, improve the high efficiency of the motor, and design the high efficiency motor.

In addition to converting electromagnetic energy into mechanical kinetic energy, the motor also consumes a part of its own kinetic energy. Typical AC motor losses can generally be divided into three parts: fixed loss, variable loss and stray loss. Variable loss is changed with the load, including motor stator resistance loss (copper loss), motor rotor resistance loss and carbon brush resistance loss.

Iron loss is composed of hysteresis loss and eddy current loss, which is positively correlated with the square meter of working voltage, in which hysteresis loss is also inversely proportional to frequency. Other stray losses are mechanical equipment losses and other losses, including friction losses of rolling bearings and air resistance losses caused by rotation of cooling fans and motor rotors.

Characteristics of high-efficiency motors

1, save resources, reduce long-term operating costs, especially suitable for textiles, centrifugal fans, centrifugal pumps, refrigeration compressor applications, by saving electricity a year can recover the cost of motor purchase;

2, immediately start, or use the frequency converter speed change, can be a full range of three-phase asynchronous motor;

3. The high-efficiency and high-efficiency permanent magnet material motor itself saves electromagnetic energy by 15% compared with ordinary motors;

4, the motor power factor close to 1, improve the quality factor of the power network, without adding power factor pipeline compensator;

5, the motor current is small, save the transmission volume, increase the overall operation of the system software service life;

6. Cost-saving budget: Take 55KW motor as an example. High-efficiency motor saves 15% more electricity than ordinary motor. Water and electricity charges are calculated by 0.5 yuan per degree. The cost of replacing motor can be recovered by saving electricity within one year.

Advantages of efficient motors

1. Starting immediately, three-phase asynchronous motor can be replaced in all directions.

2. The high-efficiency and high-efficiency permanent magnet material motor itself saves more than 15% of electromagnetic energy compared with ordinary motors.

3, the motor power factor is generally higher than the 0.90, to improve the quality factor of the power network, without adding the power factor pipeline compensator.

4, the motor current is small, save power transmission volume, increase the overall operation of the system software service life.

5. The controller can complete soft start, soft stop and stepless speed change, and the actual effect of power saving is further improved.