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Question

8.3.3 WOUND-ROTOR MOTORS
Wound rotor motors get their name from the fact that their rotors are made up of wire windings connected to a commutator ring and brushes much like a generator armature (Fig. 8.13). The commutator ring allows for external connection to specific windings in the rotor via the brushes. Depending on design, the brushes are connected to external resistances during starting or short-circuited. The brushes connect only selected windings on the rotor. These selected windings can be shifted with respect to the stator windings. The stator winding current induces a current in the shifted rotor windings. This produces a magnetic field in the rotor that is offset from the stator poles. The fields from the two currents oppose each other and thus produce a torque. These motors have excellent starting torque and low starting currents. Therefore, they are commonly used for frequent starting and stopping of heavy inertial loads. However, these motors are more expensive than split-phase or capacitor motors and also require more maintenance because of brush and commutator wear. Two types of wound-rotor motors used for agricultural applications are discussed in more detail in the following paragraphs.

Repulsion-start induction-run (RS-IR) motors start as repulsion motors but switch to operate as induction motors. At a predetermined speed, the commutator is lifted to eliminate wear and then all of the rotor windings are short-circuited via a centrifugal switch to give the equivalent of a squirrel cage winding. The repulsion-start induction-run motors are the most common type of wound-rotor motors.

Repulsion (R) motor is a term often used for all wound-rotor motors. However, a true repulsion motor is a type in which the brushes short-circuit only selected windings on the commutator in such a manner that the magnetic field axis of the rotor is shifted from the magnetic axis of the stator all of the time (Fig. 8.14). Unlike the RS-IR motor, a true repulsion motor starts and runs based on repulsion. The commutator is not removed and the rotor bars are not short-circuited. The speed of this type of motor is controlled by the load and position of the commutator brushes. This type of motor is sometimes referred to as a variable-speed motor. It is also reversible by changing the angle of the commutator with respect to the stator poles.

Answer 1

8.3.3 WOUND-ROTOR MOTORS
Wound rotor motors get their name from the fact that their rotors are made up of wire windings connected to a commutator ring and brushes much like a generator armature (Fig. 8.13). The commutator ring allows for external connection to specific windings in the rotor via the brushes. Depending on design, the brushes are connected to external resistances during starting or short-circuited. The brushes connect only selected windings on the rotor. These selected windings can be shifted with respect to the stator windings. The stator winding current induces a current in the shifted rotor windings. This produces a magnetic field in the rotor that is offset from the stator poles. The fields from the two currents oppose each other and thus produce a torque.

8.3.3绕线转子马达绕线转子电动机获得，他们的转轮是由连接，就像一台发电机电枢的换向器环，刷丝清盘的事实，他们的名字（图8.13）。该换向器环允许外部连接的转子绕组通过具体的刷子。根据设计，刷在开始连接或短期外部电阻短路。电刷连接到转子绕组唯一的选择。这些选择绕组可以转移方面的定子绕组。定子绕组电流诱导转移中的转子绕组电流。这将产生在转子磁场是由定子磁极偏移。从两个电流的领域互相反对，从而产生的扭矩。

These motors have excellent starting torque and low starting currents. Therefore, they are commonly used for frequent starting and stopping of heavy inertial loads. However, these motors are more expensive than split-phase or capacitor motors and also require more maintenance because of brush and commutator wear. Two types of wound-rotor motors used for agricultural applications are discussed in more detail in the following paragraphs.

这些电机具有良好的起动转矩，低起动电流。因此，他们通常用于频繁起动和重惯性负载停止。然而，这些发动机的价格比分相或电容电动机，也需要更多的是因为刷换向器磨损和维修。两种类型的伤口农业应用的电动机转子详细讨论以下各段。

Repulsion-start induction-run (RS-IR) motors start as repulsion motors but switch to operate as induction motors. At a predetermined speed, the commutator is lifted to eliminate wear and then all of the rotor windings are short-circuited via a centrifugal switch to give the equivalent of a squirrel cage winding. The repulsion-start induction-run motors are the most common type of wound-rotor motors.

斥力启动诱导运行（的RS - IR）的电机启动马达，但由于排斥开关运作，感应电动机。在预定的速度，换向器解除消除磨损，当时的转子绕组都是短期通过离心开关短路，令到一笼鼠笼绕组等效。在排斥启动诱导电动机运行的伤口是最常见的一种转子发动机。

Repulsion (R) motor is a term often used for all wound-rotor motors. However, a true repulsion motor is a type in which the brushes short-circuit only selected windings on the commutator in such a manner that the magnetic field axis of the rotor is shifted from the magnetic axis of the stator all of the time (Fig. 8.14). Unlike the RS-IR motor, a true repulsion motor starts and runs based on repulsion. The commutator is not removed and the rotor bars are not short-circuited. The speed of this type of motor is controlled by the load and position of the commutator brushes. This type of motor is sometimes referred to as a variable-speed motor. It is also reversible by changing the angle of the commutator with respect to the stator poles.

斥力（R）的汽车往往是所有伤口转子马达使用的术语。然而，一个真正的排斥电机是一种类型，其中刷短路只选择了以这种方式换向器，该转子磁场轴线是从所有时间定子（图磁轴转向绕组8.14）。不同的RS -红外电机，一个真正的排斥力电机启动和运行的基础上排斥。该换向器不会删除和转子栏不是短路。在这种类型发动机的转速控制负载及整流子电刷的位置。这种电机有时称为变速电机。这也是可逆的改变对定子极换向器的角度。