由于尼古拉特斯拉的AC电动机的发明已经超过100年。然而，毕竟，现代技术中最常见的困难之一是让电机和驱动尺寸正确。不可否认，部分难度在于，这是强力半导体的出现，这需要特殊考虑。电动机和功率半导体的关键方式不同，需要不同的方法来实现正确的方法。然而，基本面没有改变。这完全是关于负荷。
工业中的电动机消耗40-50％的美国所有电力。这使电机尺寸更加重要，更优先，以确保我们得到它。随着制造商寻求减少运营费用，大型能源用户可以直接从更好的电机尺寸实践中受益。根据能源部门，有很多错误的大小。大量应用程序效率的小变化可能导致电源要求的大变化。不仅需要总能量，而且还有功率因数，起始负载和峰值负载。
特别是马达和驱动器是不同的e primary way. Motors are mostly copper and steel and drives are mostly silicon. As conductors the two materials behave in profoundly different ways.
We can consider the stator by itself for the purpose of understanding the electrical behavior in a circuit. An AC motor is a giant inductor, copper wire wound around electrical steel. In spite of the fact that electrons move pretty quickly, they are very small, and it takes some time to fill up all the copper and magnetize the steel. So in one respect it behaves like a capacitor, it has a time constant in which it becomes charged. The copper exerts an electrostatic field on the steel and exerts work on the molecules of iron causing them to align and sustain a magnetic field, which also takes time.
所有这项工作都需要时间并产生热量。电机更大，时间越长，热量越多。AC电机可能需要3到7秒才能取决于负载。如果它们高度负载，则可能需要20-30秒或更长时间，具体取决于它们可以消散热量的程度。电机将拉动电流，直到负载移动或绕组发生故障，这可以达到600-700％的电流水平
The semiconductor on the other hand responds in microseconds and is much more sensitive to the rate at which current is applied and is limited generally to 200% of its rating. Therein lies the problem.
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