The dust shield is a standard configuration of some wound motors and motors with relatively low protection levels. Its main purpose is to prevent dust, especially conductive objects, from entering the inner cavity of the motor, resulting in unsafe electrical performance of the motor. In the naming, the tendency words of dust-proof or dust-proof are used.
However, from the analysis of the actual operation results of the motor, in addition to the dust-proof function, the air guide is also a very important function of the component, which has a great impact on the noise and temperature rise of the motor.
During the installation and application of the dust baffle, it is a basic requirement and principle not to interfere mechanically with related parts. Under the condition of meeting this requirement, how to adjust the matching clearance between it and the associated parts will have a great impact on the performance of the motor. The impact is still relatively large.
On the one hand in the radial basic dimension, on the other hand in the size of the axial gap. During the actual test process of the IP23 motor, it was found that when the motor dust shield (for the cage motor, it is called the wind deflector in many places) does not meet the requirements, it can be clearly felt that the air passage is not smooth or the air pressure is insufficient during the operation of the motor. The most immediate consequences are poorer temperature rise and noise levels of the motor.
For wound rotor motors, the main function of the dust shield is to prevent the dust from the collector ring running system from entering the motor winding, so it will involve two parts, the stator and the rotor dust shield. The stator dust shield is generally fixed with the end cover , is the static part, while the rotor dust-shield is the moving part, which rotates with the rotor; according to the actual functional requirements of the dust-shield, more dust-shields are made of insulating materials, but when the specifications are particularly large, considering the operation process In terms of the strength of the components, the stator or the rotor dust baffle will be made of metal, but the stator and the rotor dust baffle must not interfere with each other. Here, it must be specially explained that the size and uniformity of the gap between the two have a great influence on the temperature of the motor. The liter and noise level are also greatly affected, which is also the key to the control of the manufacturing and maintenance process.
To sum up, we can find that the mechanical performance, electrical compliance and reliability of the motor are directly related. It is the basis and basis to ensure that the quality and performance of the motor meet the requirements and improve the quality of the motor. ensure.
Post time: May-18-2023