效率是三相异步电机的重要考核指标，尤其是国家节能减排政策发布实施后。
效率的测定已成为各电机制造商特别关注的话题。为了规范和统一，电机工业研究所还组织了一些相关的培训，从测试标准化的角度促进了测试数据的客观性。
For different motors, the methods used are not the same, but also with the motor manufacturers equipped with test equipment has a greater relationship. Today we will determine the efficiency of the method of generalized run through, a little open the background of energy-saving emission reduction policy of the hottest words "efficiency" of the veil of mystery.
效率测定方法的分类
● 直接测定法。这种方法直观、简单、相对准确，但不利于对电机性能进行具体分析和针对性改进。
● 间接测定法，又称损耗分析法。该方法测试项目较多，费时费力，计算量较多，综合精度较差，但可以显示决定电机效率的主要部件的具体情况，从而方便设计对电机的工艺和制造问题进行有针对性的分析，并通过改进使电机的性能满足要求或进一步提高。
● 经过简单试验后使用理论计算的方法。该方法在测试设备配置不足时使用，精度最差。
目前，大多数电机技术条件中规定的效率限值要求采用损耗分析方法进行效率测定。
测试方法分类
GB/T 1032参考了IEC和NEMA的相关标准，对三相异步电动机效率的测定方法进行了分类，并用代号表示。
方法 A - 输入输出方法。通常仅限于额定功率≤1kW或效率指数≤80%的电机。
方法B——输入-输出损耗分析法，实际测量杂散损耗。对测量仪器仪表的精度要求较高（一般要求不低于0.2级）。
C法——损耗分析间接法（反馈法）测量杂散损耗。
E法——损耗分析法和实测杂散损耗。
E1法——推荐杂散损耗的损耗分析方法。
F 法 - 等效电路法并测量杂散损耗。
F1 方法 - 等效电路方法和推荐的杂散损耗。
G 方法 - 降低电压负载方法并测量杂散损耗。
G1 method - reduced voltage load method and recommended spurious loss.
H法-圆图计算法
常用测试方法简述
Method A - Input-Output Method
A method is called "direct determination of efficiency", often referred to as "input - output method", because the test can be directly obtained to obtain the efficiency of the two data - input electric power and output mechanical power, so called. It is also known as the "Input-Output Method" because the test can directly obtain two data for efficiency - input electric power and output mechanical power.
Method B - Input-Output Loss Analysis Method
B method is called "input-output loss analysis method", is the efficiency of the motor for efficiency certification (mainly assess the efficiency of high-efficiency motors), requires the use of a kind of efficiency test method. GB18613 on the efficiency of the test to make specific requirements.
B method to find the efficiency of the rated voltage and rated frequency under direct load test and no-load test to obtain a number of groups of input current, output power, output power (or torque), speed, and core loss and mechanical loss values, and then the relevant test values of the relevant corrections (mainly for the temperature correction of the thermal losses and the correction of the output torque) and find the corrected input power and output power, and finally Finally, the output power compared with the input power to find out the efficiency of the test points, and draw the efficiency and output power of the relationship between the curve, in the curve to check the rated output power when the efficiency value, that is, the "full load efficiency".
C法-双机拖动反馈法
C method test, with a same specification or different specifications but synchronous speed and the same motor being tested, the power is not less than the motor being tested other three-phase asynchronous motor (customarily referred to as "accompanying motor") and the motor being tested with a coupling connection. The motor under test is connected to a power supply of rated frequency; the test motor is connected to a power supply of variable frequency (whose frequency is adjustable within the range of at least 90%-110% of its rated value).
In the test, there is always a motor running as an asynchronous generator, the output of which is fed back to the grid or to another motor via a variable frequency power supply (unit or electronic). This is referred to as the "feedback method".
E-确定效率的方法-损耗分析法
该方法需要确定被测电机的输入功率，从该功率中减去损耗以获得输出功率，然后使用两者的比值来获得效率。各loss的获取方法如下：
(1) 铁芯损耗和机械损耗是通过电机空载试验获得的。
(2)在规定温度固定下，转子铜损测定方法同C法。
(3)负载杂散损耗测定方法按下列规定：E法，应进行测量； E1方法，应采用推荐值。
F法--等效电路法
等效电路计算法，是根据电机空载和插拔测试部分的数据，利用电机等效电路中相关参数之间的关系来间接获得电机效率和其他部分的特性数据，是间接获取三相异步电动机效率的方法之一。
该方法适用于被测电机容量较大而试验设备容量不足的情况，也可在需要提供某些参数（如变频电源的控制参数设置）时借用。用于电机控制系统。
G法——降压负载法
This measurement method is the "reduced voltage load method" and is one of the indirect methods for measuring efficiency. It is used when the power supply or load capacity does not allow full voltage and full load testing.
方法H——循环计算法
该方法根据绕组电阻、空载电流、空载输入功率、闭锁电流和闭锁输入功率的数据计算满载效率和功率因数。
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