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Bearing Electrocorrosion Solution - ProtectBearing Core™ Conductive Ring, a unique patented technology that utilizes hundreds of thousands of specially designed, highly conductive and extremely wear-resistant conductive fibers. One end of the ring connects to the motor housing, while the other end connects to the rotating shaft, forming a low-impedance grounding bypass to drain shaft current and effectively protect bearings from electrocorrosion damage.

Electrical Insulation Solution - GroupCore™ Series Unsaturated Polyester Imide Resin, impregnated with unique design to provide low gel temperature, high temperature resistance, low thermal weight loss, and environmental friendliness. Widely applicable in various applications such as new energy vehicle motors, special industrial motors, high-voltage inverters, and servo motors.

Patent Technology - We have obtained 3 invention patents, 1 PCT patent, and 18 utility model patents.

Professional Team - Our founding team comes from Fortune 500 companies and has been engaged in motor insulation research for the longest time. We are the most authoritative and knowledgeable team in motor drive and possess the strongest technical expertise in the industry.

Research and Development Strength - We have a range of test equipment, including the "Multi-functional dedicated high-speed (24000RPM) test bench" to complete test bench trials covering different working conditions involving oil cooling, water cooling/air cooling.

At What Voltage Does Bearing Electrocorrosion Not Occur - Axial voltage is an unavoidable technical issue in the development of new energy vehicles. We often receive questions from customers such as "What voltage is safe?" "At what voltage does bearing electrocorrosion not occur?" "At what voltage is protective measures necessary?" In response to these questions, we would like to share our views.

Whether or not axial voltage discharges depends on the comparison between the axial voltage value and the oil film breakdown voltage value. It is well known that the oil film condition is closely related to the mechanical operation of the motor (rotation speed, torque, bearing clearance, vibration, etc.). When the motor is stopped, the weight of the rotor presses on the bearings, causing direct contact between the ball and raceway, which prevents the formation of a continuous oil film. In low-speed and high-torque conditions, centrifugal force is not enough to overcome the weight of the motor rotor or the bearing is squeezed, resulting in direct contact between the ball and raceway. At this time, they cannot form an oil film, and the inner ring to outer ring of the bearing becomes a good low-impedance conductive path. In this case, the axial voltage is released through this low-impedance path in the form of resistive discharge, without producing spark attacks. It mainly affects the bearing in the form of current heating, which may accumulate over time and form abrasive traces. When it becomes severe, it can generate operational noise.

Resistive Discharge Waveform - Abrasive Traces

During medium-high speed and low torque, a continuous oil film is generally formed inside the motor bearing. The thickness of the oil film determines whether it can withstand the attack of axial voltage and whether oil film breakdown discharge occurs. If the oil film thickness is insufficient and cannot withstand the attack of axial voltage, capacitive breakdown discharge occurs. At the moment of breakdown, the current value or di/dt is very high, exerting a strong impact on the ball and raceway surfaces, causing metal melting splashes and forming pits. The subsequent rolling of the ball further splashes and compresses, resulting in the formation of stripe or washboard-like traces. This can lead to significant changes in NVH (noise, vibration, and harshness), with increased noise and vibration.

Capacitive Breakdown Discharge Waveform - Stripe or Washboard-like Traces

If the oil film quality is good and has a higher breakdown voltage, it can withstand the axial voltage without breakdown. At this time, a common mode voltage waveform is presented (specific morphology varies depending on different control strategies and operating frequencies), indicating no electrocorrosion in the bearings.

It should be noted that although the oil film does not experience through-hole discharge at this time, there is local discharge that gradually erodes the quality of the oil film, reducing its voltage withstand capacity. After a long period of accumulation, when the voltage withstand strength of the oil deteriorates to a certain extent, the previously withstandable axial voltage may no longer be tolerated, leading to breakdown discharge and bearing electrocorrosion problems.

Common Mode Voltage Waveform (No Discharge)

From the above description, we can understand that the oil film is constantly changing with motor operating conditions, ranging from zero thickness to good thickness. Therefore, its voltage withstand strength is also constantly changing. When the oil film is thin, a low voltage is sufficient to cause breakdown, while a good quality oil film requires a higher voltage to cause breakdown. Therefore, for a changing oil film state, it is not possible to provide a safe axial voltage.

Just as our bodies have different immune responses to virus invasions, weak immune systems can be overwhelmed by a small viral load, while strong immune systems can withstand more virus attacks. This is a dynamic comparative relationship. Therefore, it is not possible to simply use one factor, such as the voltage level, as a basis for determining safety.

In conclusion, there is no standard or safe axial voltage value. If you have any doubts about bearing electrocorrosion, please feel free to contact us at Hecheng Technology for further discussion