The motor energy efficiency rating is an indicator to measure the energy efficiency of the motor. It reflects the energy consumption level of the motor when it is running under rated conditions. This indicator is not only an important parameter to measure the comprehensive performance of the motor, but also an energy-saving evaluation indicator. The classification of motor energy efficiency ratings is conducive to making full use of the energy of the motor and allows users to choose motors with high efficiency according to their performance and usage.
Low-efficiency motors
1. Low-efficiency motors have low efficiency and are lower than the basic performance requirements specified in the current national energy efficiency standards. They are generally general-purpose motors, mainly used for equipment and general industry.
2. Low-efficiency motors have small capacity and low efficiency. The low efficiency of this type of motor is mainly due to excessive slip and mechanical friction losses. In addition, due to the local high impedance of the rotor, the magnetic flux density and magnetic induction intensity cannot be effectively utilized.
3. Low-efficiency motors are large in size, heavy in weight, generate a lot of heat, and make a lot of noise. This type of motor is mainly used in mechanical equipment that consumes a lot of electricity during production and use, such as fans, water pumps, compressors, etc. This type of motor is mainly due to insufficient material strength or unreasonable manufacturing process, which makes its mechanical strength and rigidity insufficient, and vibrates too much during operation.
Medium energy efficiency motor
Medium energy efficiency means that when the motor is running under rated load conditions, the average working efficiency obtained is not lower than the corresponding industry standard "JB/T4730-2005 Asynchronous Motor Energy Efficiency Limit Value and Energy Efficiency Grade".
The efficiency of the motor specified in the medium energy efficiency standard refers to the efficiency of the motor output mechanical work under rated load, rated power and speed, usually referred to as efficiency. The medium energy efficiency standard stipulates that when the motor is running under rated load, its efficiency is the average value of rated power and rated speed, and stipulates the relationship between the average working efficiency obtained by the medium energy efficiency motor and the motor of the same model, specification and capacity under the same operating conditions.
The medium energy efficiency standard classifies motors into 5 levels, with level 1 being the highest and level 5 being the lowest. The medium energy efficiency standard maximizes the working efficiency of the motor while ensuring the safe and economical operation of the motor.
High-efficiency motor
High-efficiency motor refers to a motor that uses high-efficiency motor technology. High-efficiency motor refers to a motor that has a higher efficiency than ordinary motors under the same working conditions. High-efficiency motors have significant energy-saving effects and have broad development prospects.
High-efficiency motors are divided into three-phase asynchronous motors and single-phase asynchronous motors.
Three-phase asynchronous motors are more efficient than single-phase asynchronous motors, reaching 85%~95%, but the efficiency of general motors is only about 65%. Although single-phase asynchronous motors have high efficiency, they have low power factors at start-up, and they are noisy and unstable during operation.
High-efficiency motors are products that use advanced technology to achieve a higher performance level of the motor, so they have the advantages of small size, light weight, energy saving, and good starting performance. However, due to the use of advanced technology, the cost is increased accordingly, so the price is much higher than that of ordinary motors.
Ultra-high efficiency motor
Ultra-high efficiency motor has reached a new height in motor design and manufacturing technology. Its efficiency is 10%~20% higher than the current national standard, that is, it has reached the ultra-high efficiency standard stipulated by the state.
In China, the energy efficiency levels of motors are classified from low to high as Level 1, Level 2, Level 3, and Level 4. Currently, the vast majority of motors sold in the domestic market belong to the Level 3 energy efficiency category.
General Electric Ac Motor, General Electric Electric Motors, General Electric Synchronous Motor
