More Energy Efficient  When the motors of all household appliances are running, harmonic voltages and currents of different degrees are generated, which makes the motors run under non-sinusoidal voltages and currents.  High-order harmonics will cause the increase of stator copper loss, rotor copper loss, iron loss and additional loss, the most significant is the rotor copper loss. Because the ordinary AC asynchronous motor rotates at a synchronous speed close to the fundamental frequency, the high-order harmonic voltage cuts the rotor bar with a large slip, which will cause a large rotor loss. In addition, the additional copper loss due to the skin effect needs to be considered. These losses will cause the motor to generate additional heat, reduce efficiency, and reduce output power.  However, the energy consumption can be reduced by about 20%-30% if a variable frequency motor is used. Long Lifetime When the motor is running, the carrier frequency is about several thousand to more than ten kilohertz, which makes the stator windings of the motor bear a very high voltage rise rate, which is equivalent to applying a very steep impulse voltage to the motor, so that the inter-turn insulation of the motor bears a more severe test. And the variable frequency motor can work in the rectifier filter under the voltage, which can achieve the much stable performance and longer life. Low Noise /p> The vibration and noise caused by electromagnetic, mechanical, ventilation and other factors of ordinary asynchronous motors become more complicated. The time harmonics in the frequency conversion power supply interfere with the inherent space harmonics in the electromagnetic part of the motor to form various electromagnetic excitation forces. When the frequency of electromagnetic force wave is consistent with or close to the natural vibration frequency of the motor body, the resonance phenomenon will occur and the noise will be increased. Due to the wide working frequency range and wide speed variation range of the motor, the frequency of various electromagnetic waves is difficult to avoid the natural vibration frequency of each component of the motor. But variable frequency motor can effectively solve these problems.

In our country, the electrical machinery industry has gone through a century of history. At present, my country has become the largest country in the production, use and export of small and medium-sized motors. The domestic possession of small and medium-sized motors has reached 1.6 billion kilowatts. However, my country's high-efficiency and energy-saving motor technology has not yet reached the world's advanced level, and there are still some problems in the promotion of high-efficiency motors. . Therefore, motor companies should seize the historical opportunities of the country’s implementation of major strategies such as "One Belt and One Road", "Industry 4.0", and "Made in China 2025", and take innovation-driven, intelligent transformation, strengthening of the foundation, and green development as the guiding ideology, and work hard and determined. Enterprising, realize the electric machinery industry from big to strong as soon as possible. Electric machinery companies are seizing the national strategic opportunities and realizing that the industry grows from big to strong. At present, our country has become a major producer of motors, but it still faces some problems in the promotion and application of high-efficiency motors. Therefore, the electrical machinery industry should seize development opportunities, and take innovation-driven, intelligent transformation, strengthening of the foundation, and green development as the guiding ideology to realize the early realization of the electrical machinery industry from big to strong. Motors must be used wherever electrical energy is converted into mechanical energy or mechanical energy is converted into electrical energy. Therefore, the motor industry as a whole has a huge market capacity.