Comparison|What is the difference in the production of high-efficiency electric motors and ordinary motors? What is expensive?
Ordinary motor
Electric Motor is a device that converts electric energy into mechanical energy.
70%-95% of the electric energy absorbed by the electric motor is converted into mechanical energy, which is often said to be the efficiency value of the motor.
It is an important technical index of the motor, the remaining 30%-5% is consumed by the motor itself due to heat and mechanical loss, so this part of the electric energy is wasted.
High efficiency motor
The motor with higher electric energy utilization is called high efficiency motor, referred to as "high efficiency motor".
For ordinary motors, it is not easy to increase the motor efficiency by 1 percentage point, and the material will be increased a lot, and when the motor efficiency reaches a certain value, no matter how much material is increased, it cannot be improved.
Most of the high-efficiency electric motors on the market now are the newer products of three-phase asynchronous motors.
That is to say, the basic working principle has not changed.
High efficiency electric motors mainly improve the energy efficiency of electric motors by the following ways.
1、Increase the material: increase the outer diameter of iron core, increase the length of iron core, increase the size of stator slot, increase the weight of copper wire to achieve the purpose of energy efficient motors, such as: Y2-8024 electric motor will increase the outer diameter from the current Φ120 to Φ130, some foreign countries increase Φ145, and increase the length from 70 to 90. 3Kg of iron per motor and 0.9Kg of copper wire.
2、Using silicon steel sheet with good magnetic conductivity, the hot rolled sheet with high iron loss in the past, but now using high quality cold rolled sheet with low loss, such as DW470, or even lower DW270.
3, improve processing accuracy, reduce mechanical losses replace small fans to reduce fan losses using high-efficiency bearings.
4, the electrical performance parameters of the efficient motors to optimize the design, by changing the slot shape and other parameters of optimization.
5, the use of cast copper rotor (complex process, high cost).
So to make a real premium efficiency motors, in the design, raw materials, processing are much higher costs, in order to make the maximum conversion of electricity into mechanical electrical energy.
Energy-saving measures for high-efficiency motors
Energy saving of motor manufacturers is a system engineering, involving the whole life cycle of ac motors, from operating motors design, manufacturing to ac motors selection, operation, regulation, maintenance and scrapping.
The effect of its energy saving measures should be considered from the whole life cycle of AC motors, and the improvement of efficiency is mainly considered from the following aspects at home and abroad in this regard.
The design of energy-saving motor refers to the use of optimization design technology, new material technology, control technology, integration technology, test and inspection technology and other modern design means to reduce the power loss of the motor, improve the efficiency of the motor, and design a high-efficiency motor.
While converting electric energy into mechanical energy, the motor itself also loses some energy.
Typical AC motor loss can be generally 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 not related to the load, including core loss and mechanical loss.
Iron loss is composed of hysteresis loss and eddy current loss, proportional to the square of the voltage, where the hysteresis loss is also inversely proportional to the premium frequency.
Other stray losses are mechanical losses and other losses, including friction losses of bearings and fans, rotors and other wind resistance losses caused by rotation.
The characteristics of high-efficiency motor
1、Save energy consumption, reduce long-term operating costs, very suitable for textile, fans, pumps, compressors, by power saving a year to recover the purchase cost of the motor.
2, direct start, or speed control with a frequency converter, can fully replace the asynchronous motor.
3, rare earth permanent magnet energy efficient motor itself can save more than 15 ℅ of electricity than ordinary motors.
4, motor power factor close to 1, improve the quality of the grid factor, no need to add power factor compensator.
5, Most motors current are small, saving transmission and distribution capacity, extending the overall operating life of the system.
6, power saving budget: 55 kilowatt motor, for example, high-efficiency motor than the general motor power saving 15%, electricity cost per degree by 0.5 yuan, the use of energy-saving motor within a year by power saving can recover the cost of replacing the motor.
The advantages of high-efficiency motors
1, direct start, can fully replace the asynchronous motor.
2, rare earth permanent magnet high efficiency energy-saving motor itself can save more than 3% of electricity than ordinary motors.
3, motor power factor is generally higher than 0.90, improve the quality factor of the grid, no need to add power factor compensator.
4, the motor current is small, saving transmission and distribution capacity, extending the overall operating life of the system.
5, plus the drive can achieve soft start, soft stop, stepless speed regulation, power saving effect further improved.
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please contact with Dongchun motor China
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