从西门子的资料SINAMICS Engineering Manual 中看到下面一句话“With the factory set pulse frequency of 2.0 kHz or 1.25 kHz, the motor current is already close to sinusoidal. The
stray losses in the motor caused by harmonic currents are low, but not negligible. Commercially available standard
motors for 50 Hz or 60 Hz operation utilized according to temperature class 130 (B) in operation directly on line can
be utilized according to temperature class 155 (F) at the nominal working point up to rated torque when operated on
a converter. The winding temperature rise is then between 80 and 100 K.”也是印证了如果电机由变频器供电时，需要按照F级温升来考虑。所以我觉得如果客户坚持要求是按B级温升考虑时，电机必须要选大一些。以前大家之所以按1：1选型，肯定是能用，只不过没有完全按照客户要求选罢了，而且客户也没有太较真。 不知道我理解的对么？