How to select conductive slip ring material

Learn from the practitioners in the motor manufacturing industry , We know that the material of the conductive slip ring has a great influence on the key level of the motor . High quality and suitable slip ring material is one of the key factors to ensure the long-term stable operation of the motor . therefore , Usually , When selecting the appropriate conductive slip ring material , We need to fully consider many factors , The details can be summarized as follows ：

In general , When selecting conductive slip ring material , Current and voltage should be considered first , Especially for the principle of switching power supply , Consider or exceed the voltage and current level in the occurrence stage . in addition , For the conductive slip ring of high-level data signal , Power circuit is another factor that must be considered , Because the key influence of high-level power circuit is noise . The working voltage instability and other undesirable characteristics of electronic signals are called electrical equipment noise . The cause of the short circuit comes from the internal noise or magnetic induction noise of the conductive slip ring power supply circuit .

at present , The reason of magnetic induction noise in mofuron technology conductive slip ring power supply circuit is the principle of switching power supply and data signal power supply circuit , Such as frequency converter 、 Servo controller is too close ; The main cause of the internal noise is the change of the characteristic impedance of the conductive slip ring and the motor carbon brush surface . Because different materials have different conductivity , The surface will have different characteristic impedance , Therefore, the low-cost slip ring has high original characteristic impedance . When the conductive slip ring is rotating , Its characteristic impedance will change slightly . The amount of current causes the switching operating voltage according to the characteristic impedance of the transition , The data signal-to-noise ratio is determined by the change of the operating voltage . In addition to data signal characteristics , When selecting conductive slip ring material , Also consider environmental factors . for example , In extreme natural environment , Such as high and low temperature 、 High corrosion , It is necessary to use advanced materials to reduce the impact of the environment on the brush surface of the conductive slip ring motor .