The brushless DC inverter motor is a new type of DC motor developed with the improvement of the performance of permanent magnet materials, the decline of manufacturing cost and the development of power electronics technology; and the motor has good speed regulation performance and flexible control method. Variable, high efficiency, large starting torque, strong overload capability, no commutation spark, no radio interference, no excitation loss and long operating life, etc., have a significant impact on the development of inverter appliances.
DC inverter motor: energy saving is better
According to the "heart" of the home appliance - the motor, the home appliance can be divided into fixed-frequency appliances and inverter appliances; and the inverter appliances can be subdivided into AC inverter appliances and DC inverter appliances.
The motor used in fixed-frequency home appliances is a single-phase asynchronous motor. This type of motor is often in a short-time frequent on/off state during operation, which has a series of disadvantages such as high noise, poor stability, high energy consumption and short life.
Compared with the AC variable frequency motor, the DC variable frequency motor uses a permanent magnet, which reduces the loss of the induced current and magnetic field of the motor rotor, and therefore has a higher energy saving potential. As a more energy-efficient product, DC inverter appliances are expected to become a brand-new bright spot in the home appliance industry; DC inverter technology will also become the most promising focus technology, and brushless DC inverter motors will certainly become the technology. The most popular frequency conversion device.
For the advantages of frequency conversion appliances, Lu Jianguo, the head of the inspection department of the National Household Appliances Quality Inspection Center, introduced the inverter washing machine as an example. On the one hand, when the dehydration starter of the fixed-frequency washing machine is started, the speed is directly increased from zero to a certain high speed. The speed span is large, which is easy to cause large vibration and high noise. The application of the frequency conversion speed control technology can make the washing machine soft start and the motor speed. It can be gradually increased from zero to the highest speed, so that the dewatering cylinder can rotate smoothly, and the vibration is extremely small, which effectively reduces the noise of the washing machine. On the other hand, the inverter washing machine can adjust how much water and how long it is washed, thereby achieving high efficiency in water saving and power saving. In general, the energy efficiency of the inverter washing machine can be increased by 1/3 compared with the ordinary product, the noise is reduced by 3-4 decibels, and the washing degree is also greatly improved.