IEC？60034-4-1:20 18适用于1？kVA额定值及更大，并描述了旨在用于具有带滑环和电刷的励磁绕组的机器的方法。具有无刷励磁的同步电机在某些测试中需要特别的努力。对于永磁励磁的机器，所述测试的适用性有限，应采取特殊预防措施防止不可逆退磁。

IEC？60034-4-1:2018 applies to three-phase synchronous machines of 1？kVA rating and larger and describes methods intended to be used for machines having an excitation winding with slip-rings and brushes for their supply. Synchronous machines with brushless excitation require special effort for some of the tests. For machines with permanent magnet excitation, there is a limited applicability of the described tests, and special precautions should be taken against irreversible demagnetization.