The brushless dc motor in the south of anhui after-sales service case 2: the new YX3 series brushless dc motor is original YX3 series brushless dc motor efficiency

Brushless dc motor in the south of anhui after-sales service case 2: a user reflect the new sample YX3 efficient brushless dc motor in efficiency value than the original YX3 efficiency value in a sample by a sharp decline, the new YX3 efficiency value and YP2 fairly, customer reference sample after think: high efficiency brushless dc motor and compared to ordinary YP2 brushless dc motor, the efficiency value is not much. Case analysis: the first: YP2 in line with the GB 18613 - series 2006 'small and medium sized three-phase asynchronous motor efficiency limit' three-stage efficiency ( 2006 version of the old standard level 3 efficiency) Equal to the difference between IEC60034, efficiency level 30 IE1 standards of efficiency, the standard now has been abolished, it is prohibited to use, this series brushless dc motor efficiency using the method of indirect loss ( E) , stray loss according to the input power of 0. 5% of fixed value calculation. Second: original YX3 accord with GB - 18613 2006 small and medium-sized three-phase asynchronous motor efficiency limit of the efficiency of the secondary ( 2006 version of the old standard secondary efficiency) , equal to the difference between IEC60034 efficiency 30 the efficient IE2 efficiency using the method of indirect loss ( E) , stray loss also press 0. 5% of fixed value calculation. Third: the new YX3 and YE2 efficiency in accordance with GB 18613 - 2012 'small and medium sized three-phase asynchronous motor efficiency limit' three-stage efficiency ( 2012 edition of the new standard level 3 energy efficiency) , equal to the difference between IEC60034 efficiency 30 efficient IE2, the measured input - efficiency The output power loss ( B) , stray loss according to the measured values is calculated. See from the above analysis, this problem is because countries in different periods of manufacturing standard method to test the efficiency change, 2006 edition standard E method is used to measure efficiency, 2012 edition of national standard efficiency by using B ( The measured stray loss) Determine the efficiency of brushless dc motor, according to experience, the measured stray loss, B) Than to calculate stray loss 0. 5% ( E) Big, so to develop the new GB18613 - 2012, in order to keep the efficiency level, the efficiency of the standard value than the original have varying degrees of decline, the following example: from the test data analysis, using the B method measured the stray loss of 1. 8%, E method is used to calculate a fixed value is 0. 5%, two methods of testing the efficiency value is 1. 3%, 11 kw if use the new 2012 version of the test method of the measured efficiency values, YX3 original for 91. 0% - 1. 3% = 89. 7%, YP2 for 88. 4% - 1. 3% = 87. 1%. 2: look from the standard value, although YX3 ( A new version) And the efficiency of YP2 standard numerical approach, but the measured efficiency YX3 than YP2 high efficiency 2. 7% ( 89. 8% - 87. 1%) 。 Three: currently, there are some samples on the market efficiency, but also USES the 2006 version of efficiency standard value belongs to the standard has been abolished, does not conform to the new national standard GB 18613 - 2012 'the allowable value of small and medium-sized three-phase asynchronous motor efficiency'.