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Apr 20, 2022 View:

Difference between Ordinary motor and High-efficiency motor

Ordinary motor: The motor is a device that converts electrical energy into mechanical energy. 70%-95% of the electric energy absorbed by the motor is converted into mechanical energy. This is the efficiency value of the motor, which is an important technical indicator of the motor, and the remaining 30%- 5% of the motor is consumed by the motor itself due to heat, mechanical loss, etc., so this part of the energy is wasted.

High-efficiency motor: A motor with a high energy utilization rate is called a high-efficiency motor. For ordinary motors, every 1% 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 is added, it cannot be improved. Most of the high-efficiency motors on the market today are newer generations of three-phase asynchronous motors, which means that the basic working principle has not changed.

High-efficiency motors mainly improve the efficiency of the motor by the following means.
1. Adding materials: increase the outer diameter of the core, increase the length of the core, increase the size of the stator groove, and increase the weight of the copper wire to achieve the purpose of improving efficiency. For example, the Y2-8024 motor increases the outer diameter from the current Φ120 to Φ130. Some foreign countries increase Φ145 and increase 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. Silicon steel sheets with good magnetic permeability are used. In the past, hot-rolled sheets with large iron loss have been used, and high-quality cold-rolled sheets with low loss, such as DW470, are now used. Even lower DW270.
3. Improve processing accuracy.
4. Optimize the electrical performance parameters of the motor and optimize the parameters by changing the groove shape.
5. Using cast copper rotor (process is complex, high cost).

Therefore, there are many costs in design, raw materials, and processing when making a truly efficient motor.

High efficiency motor features
1. It saves energy and reduces long-term operating costs. It is very suitable for textiles, fans, pumps and compressors. It can recover the cost of motor purchase by one year of saving electricity;
2. Directly start, or use the frequency converter to adjust the speed, can completely replace the asynchronous motor;
3. Motor power factor is close to 1, improve the quality factor of the power grid, no need to add power factor compensator;
4. The motor current is small, saving transmission and distribution capacity and extending the overall operating life of the system;
5. Power-saving budget: Take 55Kw motor as an example, high-efficiency motor is 15% more energy-efficient than the general motor. The electricity cost is calculated at 0.5 Yuan per degree. The energy-saving motor can be used to recover the cost of replacing the motor within one year.

For Ace ROTARY LOBE PUMPS and HOMOGENIZER MIXERS, we suggest our customers use High efficiency motors. Though it has higher cost, it is undeniable that under the premise of energy saving and environmental protection and reducing long-term operating costs, high-efficiency motors will be more and more in the future, and ordinary motors will be gradually eliminated. At present, we have independently developed the fourth generation pump, which has made great progress in energy saving and high efficiency.