三相感应电机是无刷电机。定子为铜绕组，转子是典型的铝质松鼠笼结构。典型的驱动器配置是一个三相桥（3个半桥），调制之后提供三路正弦波电压给定子。因为通常用于大功率应用，驱动部分可以由功率MOSFET或带有高压栅极驱动电路的IGBT组成，或者由集成了三个半桥和相关栅极驱动级的功率模块组成。磁场定向控制或标量（伏特/赫兹）控制算法是在控制逆变器的微控制器中实现的。
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我们提供全系列的功率半导体元件和集成电路，包括分立式IGBT和功率MOSFET、以及电源模块和智能电源模块（IPM）、高压栅极驱动器和功能强大的STM32微控制器，这些都是实现高效变频驱动（VFD）电机控制时所需要的。
为了帮助缩短和简化设计周期，我们提供完整的硬件生态系统 — 评估板和参考设计 — 以及各种固件和软件库。
三相感应电机的工作原理
在三相交流感应电机中，有三个定子绕组，每个绕组通常分为两半，而转子绕组则由端环短路。当电流经过定子相对两侧的线圈时，会建立一个两极电磁体，从而形成一个两极电机。依次对每个电磁体施加相位会产生足以使转子开始移动的旋转磁场。
更多绕组可以在电机中产生更多磁极，需要更复杂的控制，但转子定位的准确性更高。例如，四极电机被视为电动汽车电机驱动所需转矩和响应能力的最佳选择。但是，只有采用更复杂的控制方案，才能实现更高的极数。
典型驱动具有三个半桥，每个半桥向定子输送正弦波电压。采用具有高压栅极驱动器的功率MOSFET或IGBT，或是结合了三个半桥和相关栅极驱动的功率模块。这些可以使用标量算法来改变电压以确定相的频率或伏特/赫兹。矢量控制或磁场定向控制（FOC）等更复杂的算法用于控制高端电机中多相的频率，目前在三相感应电机范围内越来越流行。
多相电动机通常包括使用多极的三相电机。
直接转矩控制
三相感应电机的转子中产生的转矩与每个定子磁极产生的磁通量、转子电流和转子功率因数成正比。直接转矩控制（DTC）是变频驱动中使用的一种技术。来自于根据电机的电压和电流估算的磁通量。将其与参考值进行比较以控制转矩。
通过更改参考值，可以快速改变磁通量和转矩，使电机更高效，而且，由于只使用精确电流，因此可以减少功率损耗。同时也避免了转子过冲，从而可以更精确地控制电机。
故障诊断
Three-phase induction motors are a key part of almost every industrial process. 因此，有许多故障检测和诊断方法 可以确保电机保持生产线的运转。
然而，尽管这些电机具有很高的可靠性，但大多数方法都需要大量专业知识才能成功应用，包括电压、电流、振动或热特性。因此，需要更简单的方法，以便生产线操作员能够做出可靠的决策。电机制造商希望减少电机中传感器的数量，因为传感器可能会出现故障并导致可靠性问题。
转子故障在生产过程中属于小故障，可能由生产故障或电机运行时转子上的机械、环境、电磁或热压力引起。即使这些故障最初很小，但随着时间的推移，故障也会扩大，转子断裂或破裂可能导致邻近部件因电流增加和热活动而发生故障。
机械学习越来越多地被用来监测电机的性能，比较控制系统中使用的不同类型数据的模式，以预测任何潜在的故障。
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Solution
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100W High Voltage Motor Control Solution for 3-phase Inverters
SL-MCIMC00302V1
批量生产
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100W High Voltage Motor Control Solution for 3-phase Inverters
SL-MCIMC00302V1
批量生产