simulateadcmotordrive翻译答题.doc

 PAGE \* MERGEFORMAT 23 Simulate a?DC?Motor Drive模拟直流电机驱动 Introduction介绍 in this section, you will learn how to use the DC drive models of the Electric Drives library. First, we will specify the types of motor, converters, and controllers used in the seven DC drive models of the library, designated DC1 to DC7.?These seven models are based on the?DC?brush motor in the Electric Drives library.As in any electric motor, the?DC?brush motor has two main parts, the stator (fixed) part and the rotor (movable) part.?The?DC?brush motor also has two types of windings, the excitation or field winding and the armature winding. As its name implies, the field winding is used to produce a magnetic excitation field in the motor whereas the armature coils carry the induced motor current.?Since the time constant (L/R) of the armature circuit is much smaller than that of the field winding, controlling speed by changing armature voltage is quicker than changing the field voltage. Therefore the excitation field is fed from a constant?DC?voltage source while the armature windings are fed by a variable?DC?source.The latter source is produced by a phase-controlled thyristor converter for the DC1 to DC4 models and by a transistor chopper for the DC5, DC6, and DC7 models. The thyristor converter is fed by a single-phase AC source in the cases of DC1 and DC2 and by a three-phase AC source in the cases of DC3 and DC4. Finally, the seven DC models can work in various sets of quadrants. All these possibilities are summarized in the following table. 在本节中，您将学习如何使用电动驱动器库的直流驱动模型。首先，我们将详述库中七个直流驱动模型的电机、转换器和控制器，这些模型即DC１到DC７。这７种模型都是基于电动驱动器库中的直流有刷电机。就像在任何电动机一样，直流有刷电机有两部分，即定子和转子。直流有刷电机有两种线圈，励磁绕组和电枢绕组。就像（直流有刷电机）的名字一样，励磁绕组是用来在电机中产生励磁磁场，而电枢线圈产生感应电机电流。由于电枢电路的时间常数（L／Ｒ，电感／电阻）远小于其在励磁绕组中，通过电枢电压控制速度远快于通过励磁电压来控制。所以励磁磁场由一个稳定不变的直流电压源供电，而电枢绕组由一个变化的直流电压源来供电。DC1 到 DC4中 电枢绕组供电的直流电压源由一个三相控制的晶闸管转换器供电，DC５ 到 DC７中则是由一个晶体管斩波器产生。DC1 、 DC２的晶闸管转换器由一个单相交流电流源供电，DC３和DC４则是通过此晶闸管转换器由三相交流源供电。最后，这７个模型工作在不同的模型下。所有可能的情况都在下表表示出了。 DC Mo