What is the difference between high efficiency motor and ordinary motor production?

Ordinary motor: the motor is to convert electrical energy into mechanical energy device, the electric energy absorbed by the motor is 70%-95% into mechanical energy, which is often said that the efficiency of the motor value, it is an important technical indicator of the motor, the remaining 30%-5% part of the motor itself due to heat, mechanical loss and other consumption, so this part of the electric energy is wasted.

High efficiency motor: The motor with high energy utilization rate is called high efficiency motor, referred to as "high efficiency motor".

For ordinary motors, every 1 percent increase in efficiency is not easy, the material will increase a lot, and when the motor efficiency reaches a certain value, no matter how much material can not be improved. Most of the high-efficiency motors on the market now are the replacement products of three-phase asynchronous motors, that is to say, the basic working principle has not changed.

High efficiency motor mainly through the following ways to improve the efficiency of motor.

1. increase the material: increase the outer diameter of the core, increase the length of the core, increase the size of the stator slot, increase the weight of the copper wire to achieve the purpose of improving efficiency, such as: Y2-8024 motor will increase the outer diameter from the current Φ120 to Φ130, some foreign countries increase Φ145, while the length from 70 to 90. The amount of iron used in each motor is increased by 3Kg. The copper wire is increased by 0.9kg.

2. The use of silicon steel sheet with good magnetic permeability, hot rolled sheet with large iron loss in the past, now use high-quality cold rolled sheet with low loss, such as DW470. Even lower DW270.

3, improve processing accuracy, reduce mechanical loss replace small fan to reduce fan loss using efficient bearings.

4. Optimize the electrical performance parameters of the motor, and optimize the parameters by changing the groove shape.

5. The use of cast copper rotor (complex process, high cost).

Therefore, to make a truly efficient motor, the cost of design, raw materials and processing is much higher, so that the power can be converted into mechanical energy to the greatest extent.

Energy-saving measures of high efficiency motor

Motor energy saving is a system engineering, involving the whole life cycle of the motor, from the design and manufacture of the motor to the selection of the motor, operation, regulation, maintenance, scrap, to consider the effect of its energy-saving measures from the whole life cycle of the motor, at home and abroad in this regard mainly consider from the following aspects to improve efficiency.

The design of energy-saving motor refers to the use of optimization design technology, new material technology, control technology, integration technology, test and detection technology and other modern design means to reduce the power loss of the motor, improve the efficiency of the motor, and design an efficient motor.

When the motor converts electrical energy into mechanical energy, it also loses some energy itself, and the typical AC motor loss can be generally divided into three parts: fixed loss, variable loss and stray loss. Variable loss varies with load, including stator resistance loss (copper loss), rotor resistance loss and brush resistance loss; Fixed losses are load independent and include core losses and mechanical losses.

The iron loss is also composed of hysteresis loss and eddy current loss, which is proportional to the square of voltage, and the hysteresis loss is inversely proportional to the frequency. Other stray losses are mechanical losses and other losses, including the friction loss of bearings and the wind resistance loss caused by rotation of fans, rotors, etc.

Characteristics of high efficiency motor

1, save energy, reduce long-term operating costs, very suitable for textile, fan, pump, compressor use, by saving electricity one year can recover the motor acquisition cost;

2, direct start, or use frequency converter speed regulation, can be fully replaced asynchronous motor;

3. The rare earth permanent magnet energy-saving motor itself can save more than 15 percent of the electric energy than ordinary motors;

4, the motor power factor is close to 1, improve the power grid quality factor, no need to add power factor compensator;

5, the motor current is small, save power transmission and distribution capacity, extend the overall operating life of the system;

6, power saving budget: Take 55 kilowatt motor as an example, efficient motor than the general motor energy saving 15%, electricity per degree calculated by 0.5 yuan, the use of energy-saving motor within a year by saving electricity can recover the cost of replacing the motor.

Advantages of efficient motors

Direct start, can be fully replaced asynchronous motor.

The rare earth permanent magnet energy-saving motor itself can save more than 3% of electric energy than ordinary motors.

The power factor of the motor is generally higher than 0.90, which improves the quality factor of the power grid without adding a power factor compensator.

The motor current is small, saving power transmission and distribution capacity, extending the overall operating life of the system.

The driver can realize soft start, soft stop and stepless speed regulation, and the power saving effect is further improved.