改进的圆图法是根据电动机的空载试验和堵转试验数据，利用圆图求取电动机额定功率时的效率、功率因数和转差率的一种方法。通过对起动电抗的修正，简单的冷态电阻测量、空载试验和额定频率下的短路试验，就可以得到，根据这些参数能较为准确的推算出电动机的转差率、效率、功率因数等指标。改进的圆图法可适用于不能进行负载试验的大、中型电动机。%The improved circle-diagram method is a method based on data of no-load and locked-rotor test of the motor, which obtains efficiency, power factor and slip of motor at rated power by circle diagram. By starting reactance correction, simple cooling resistance measure, no-load test and short-circuit test at rated frequency, the parameters data can be obtained. Based on these parameters, the indicators of motor such as slip, efficiency and power factor can be correctly derived. The improved circle-diagram method can be used in medium-and large-sized motor which is unable to carry out load test.
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