Permanent magnet motor is a product with better energy saving effect. Many units have replaced three asynchronous motors with permanent magnet motors and replaced DC motors. We also frequently receive customer demand information and phone calls in this regard to inquire about the energy saving effects of permanent magnet motors.
Permanent magnet motors are different from other motors. They cannot achieve energy saving effects simply by replacing them. Generally speaking, the following aspects determine the energy saving effects of permanent magnet motors.
The first is that the permanent magnet motor is a one-stage energy-efficient motor, while the ordinary three-phase asynchronous motors and DC motors are three-stage energy-efficient. In theory, there is 5-10% energy saving space. In actual use, permanent magnet motors The speed of the motor is faster than the three asynchronous motors. In the same time, the production capacity of the permanent magnet motor will be high. Therefore, when calculating the energy saving effect, the energy saving effect cannot be simply calculated by time, but should be based on the time capacity ratio. Calculate energy savings.
The second is that the electric power consumption of permanent magnet motors is very low under no-load conditions. For example, in oil field pumping units, the motors are active when lifting, and the power consumption is relatively high. When the pumping units are lowered, they are not only under no-load conditions, but There is also falling inertia, so the power consumption is particularly low. Therefore, under different load conditions, the energy saving effect of permanent magnet motors is also different.
The third is that with the speed change of the permanent magnet motor, the power consumption is also different. The fast speed and high power consumption, otherwise the slow speed and low power consumption. In the case of the same model and specifications, the permanent magnet motor is equipped with an inverter. Speed can be adjusted, and its energy saving effect is good, and the energy saving effect of permanent magnet motors that cannot be adjusted since start-up is poor.
The fourth is the motor of the original equipment configuration. Due to the different working conditions, the power margin of the motor is also different during the design. So when the permanent magnet motor is energy-saving, the original motor has a large power margin and energy saving effect It ’s better. The power margin of the original motor is small, and the energy saving effect is worse.
In summary, when using permanent magnet motors for energy-saving retrofits, energy-saving effects cannot be achieved simply by replacing the motors. It is necessary to design energy-saving solutions according to different working conditions to achieve good energy-saving effects and provide permanent magnets. Energy-saving solutions for motors.