High-efficiency motor

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The YX3 high-efficiency motor is the first high-efficiency motor in China to use cold-rolled silicon steel as the magnetic conductive material. It was designed and developed based on the Y3 motor. The Y3 motor is the first ordinary motor in China to be designed using cold-rolled silicon steel as its magnetic conductive material; it is a product that embodies the concept of “replacing heat treatment with cold processing”. The YX3 motor was designed in 2003 and passed the appraisal organized by the Machinery Federation in September 2005. It mainly meets the Class 2 energy efficiency standard of GB/T18613-2002 – that is, the energy-saving evaluation value. It also meets the EFF1 criteria in Europe. The energy-saving evaluation value of the later GB/T18613-2006 version can also be achieved. In its testing method, the stray losses of the motor are calculated as 0.5% of the input power, and electromagnetic data is also computed based on this value. Before 2008, when domestic motor manufacturers applied for Level 2 energy efficiency registration and energy-saving product certification, they all used YX3 motors, except for joint-venture brands. Therefore, as an efficient motor, the YX3 motor is widely known in China. In 2008, the IEC and NEMA in the United States reached an agreement through negotiations to standardize the specifications and testing methods for high-efficiency motors, establishing new energy efficiency standards and testing procedures. The biggest difference is that the performance index of the high-efficiency motor, namely the IE2 value, has decreased; however, a detection method with low uncertainty is used for testing the motor. The main distinction lies in the fact that the stray losses of the motor are determined through actual measurements. This differs from the design of YX3; it involves adjustments to the performance metrics, and there are no motors in China that meet the IE3 standards. As a result, in 2009, the Shanghai Electric Research Institute brought together dozens of motor manufacturers in the industry to jointly develop motors that met the IE2 and IE3 standards. The IE2 motor is developed by making adjustments to certain aspects of the design of the YX3 high-efficiency motor, in order to meet the requirements of the IE2 standards and testing methods; it is therefore named the YE2 series of high-efficiency motors. This series passed the evaluation organized by the Machinery Industry Federation in 2011. For motors that meet the IE3 standards, there were no existing reference models in China; only the NEMA ultra-high efficiency series was available, and a few manufacturers produced such motors. Based on this, motors that comply with the IE3 requirements were developed in China, and they were named the YE3 series of ultra-high efficiency motors. The later revised version GB/T18613-2012 sets the criteria for IE2 as the basic energy efficiency limit, corresponding to an energy efficiency level of 3, while the criteria for IE3 are used as the energy savings evaluation value, corresponding to an energy efficiency level of 2. That means that the YX3 series motors can achieve new Class 3 energy efficiency standards with slight adjustments, while the YE2 motors are already high-efficiency motors designed in accordance with IE2 requirements. Under the new standards, although the numerical value of the YX3 indicator is slightly higher than that of YE2 motors, the testing methods differ. In many specifications, its performance is comparable to that of YE2 motors; both fall under the new high-efficiency Level 3 energy efficiency category. Under the new **standards**, these two series of motors are classified as ordinary high-efficiency motors. Since motors of the Y, Y2, and Y3 series have been largely phased out in China, the YE3 ultra-high-efficiency energy-saving motors help save energy and reduce long-term operating costs; they are particularly suitable for use in textile machinery, fans, water pumps, and compressors. The cost of purchasing such motors can be recouped within a year through energy savings ； Direct startup or speed control using an inverter allows for the complete replacement of asynchronous motors ； Rare earth permanent magnet high-efficiency energy-saving motors can save more than 15% on electricity consumption compared to ordinary motors ； The motor’s power factor is close to 1, which improves the quality factor of the power grid; no power factor compensator is required ； The motor current is low, which saves transmission and distribution capacity and extends the overall operational life of the system.