The wound rotor motor is more complicated than the cage rotor motor structure. In addition to the particularity of the rotor winding, the connection, fixing, extraction and electrical connection of the rotor lead are a systematic project. Some wound motor rotor leads are connected to the collector ring by means of external connection, and many motors, due to the actual needs of the structure, will drill deep holes in the shaft, and then the rotor leads are taken out from the deep holes of the shaft. And connected to the slip ring.

The structure in which the rotor leads are taken out from the deep holes is complicated. The first is the machining of the shaft. There must be special drilling equipment, and the position of the lead must be smooth enough to prevent the lead from being damaged due to machining defects, and electrical faults occur, especially for motors with large rotor currents. The lead diameter is relatively large, and the lead mounting process is relatively difficult; another problem of this structure is that the fixing problem from the lead winding portion to the deep hole portion is ensured that the lead wire is far away from the conductor as much as possible. On the one hand, we must try our best to reduce the centrifugal force during the rotation of the rotor. Therefore, this link is the key point of motor manufacturing and quality control. Different manufacturers have different processes, but reliability is the quality goal that everyone pursues together. .

The characteristics and uses of asynchronous motors

Asynchronous motors are mainly used as motors. It is the most widely used and most demanding motor in industrial and agricultural production and various sectors of the national economy. Metal cutting machine tools, rolling equipment, blowers, pulverizers, pumps, oil pumps, light industrial machinery, textile machinery, mining machinery, etc., most of them are driven by asynchronous motors. In people's daily life, the application of asynchronous motors is also increasingly widespread. For example, electric fans, washing machines, refrigerators, air conditioners and other household appliances use single-phase asynchronous motors. In electric power drag, the vast majority of the drag motor is an asynchronous motor, and its power consumption accounts for about 60% of the total load of the power grid.

The reason why the asynchronous motor is widely used is that it has the advantages of simple structure, convenient use, reliable operation, high efficiency, easy manufacture, and low cost.

The speed regulation performance of the asynchronous motor itself is poor. When a wide and smooth speed regulation range is required, a DC motor is generally used. In the past one or two decades, the asynchronous motor AC speed control system developed on the basis of power electronic devices and microcomputers has improved the speed regulation performance of asynchronous motors, and thus its use is more extensive.

When the asynchronous motor is running, reactive power must be absorbed from the grid, which will degrade the power factor of the grid. Since the power factor of the grid can be compensated for by other means, this does not hinder the widespread use of asynchronous motors.

Wound-type asynchronous motor features and uses

Wire wound asynchronous motors are a class of asynchronous motors. Asynchronous motors are available in the form of rotor windings, which are divided into wound and squirrel cages. The rotor of the motor of the wound-type motor is a coil wound by a copper wire, and the end of the coil is led to the starting control device through the slip ring. Therefore, the wound-type motor has the characteristics of small starting current, controllable, and large starting torque.

The reason why the wound-type asynchronous motor is widely used is that it has the advantages of simple structure, convenient use, reliable operation, high efficiency, easy manufacture, and low cost.

The speed regulation performance of the wound-type asynchronous motor itself is poor. When a wide and smooth speed regulation range is required, a DC motor is generally used. In the past decade or two, the AC-speed control system of the wound-type asynchronous motor developed on the basis of power electronic devices and microcomputers has improved the speed regulation performance of the wound-type asynchronous motor, and thus its use is more extensive.

When a wound-wound asynchronous motor is running, reactive power must be absorbed from the grid, which will degrade the power factor of the grid. Since the power factor of the grid can be compensated for by other means, this does not hinder the widespread use of wound-wound asynchronous motors.

Reprinted from the network