NU217ECM/C3VL0241 85*150*28mm Insulated Insocoat bearings for Electric motors

NU217ECM/C3VL0241 85*150*28mm Insulated Insocoat bearings for Electric motors

Electric motors, generators and associated equipment are at risk when an electric current passes through their bearings. This can damage the contact surfaces of rolling elements and raceways in the bearings (electrical erosion) and rapidly degrade the grease. An additional risk in electric motors and generators comes from high frequency currents caused by the inherent stray capacitance.

The risk of damage increases where the application uses a frequency converter.

Insulated Insocoat bearings are designed to prevent electric current from passing through the bearing

have the external surfaces of either their inner or outer ring coated with an insulating aluminium oxide layer, by applying a sophisticated plasma-spray process for an outstanding quality finish

are a very cost-effective solution compared with other insulation methods.

Electrical pitting often occurs in the use of rolling bearings in high power electromotor, wind turbine generator and rail vehicles motor systems and cause sparks that damage the rolling contact surface, ultimately lead to bearing failure.

Electric insulated bearings therefore have been created and take the place of non-insulated bearings. we applies advanced surface modification process overlay a ceramic coating on the bearing ring, to insulate the electrical current flow into bearing substrate, so the electrical pitting is prevented and bearing's service life is extended.

It is significantly more cost-effective to provide for the use of electrically insulated bearings at the planning stage. As a result, customer benefit is increased through reduced maintenance costs and higher machine availability.

SAT series are the electrically insolated bearing products developed and marketed by us The insulation has a guaranteed breakdown resistance of at least 1000V AC or DC. We can also develop tailored modes for customer on types and precision levels, as well as higher electrical insulation.

Bearing features

Protection against electrical erosion

With insulating properties integrated into the bearing, INSOCOAT bearings can improve reliability and increase machine uptime by virtually eliminating the problem of electrical erosion.

High electrical resistance

The aluminium oxide coating provides a minimum electrical resistance of 200 MΩ and can withstand voltages up to 3 000 V DC.

Consistent electrical performance

Plasma-spray coatings are normally hygroscopic and, therefore, vulnerable to penetration caused by condensation. To protect against this effect, INSOCOAT bearings are treated with a unique sealant.

Application of Insulated Bearings in Electric motors

1. Causes and harm of motor shaft voltage and bearing current formation

In the operation of the motor, any imbalance in the phase currents in or around the rotor’s magnetic circuit can produce a rotating system flux linkage.

When the shaft rotates, these flux chains can generate a potential difference across the shaft. This potential difference is called the shaft voltage. The shaft voltage can excite a circulating current through a loop formed by the two ends of the bearing in the shaft and the casing (closed circuit), which is called the shaft current.

In addition, the rotor core has more remanence, For a wound rotor motor, shaft voltage and shaft current are generated if two or more windings are short-circuited to the rotor core or the shaft. the bearing current is related to the structure of the motor, the power of the motor, the magnitude of the drive voltage, the rise time of the pulse, the length of the cable, etc. The larger the power of the motor, the higher the driving voltage, the steeper the rising edge of the driving voltage, and the shorter the cable, the larger the bearing current.

2. How to block shaft current – use electrically insulated bearings

In order to avoid damage to the bearing caused by the shaft current, effective measures should be taken to isolate the shaft current. For large motors with independent bearing housings at both ends, spacers made of insulating material can be placed between the bearing housing and the metal base. For a motor in which an ordinary bearing and a casing are integrated, an Electrically insulated bearing is generally used at one end thereof (often arranged at the non-spindle end).

For high requirements, insulated bearings are installed at both ends. The insulating bearing used is generally a method of attaching (generally coating) an insulating layer to the outer ring. In some cases, the inner and outer rings are also provided with an insulating layer.

Electrically insulated bearings avoid damage caused by electrical corrosion, so they are more reliable in operation than in conventional bearings. And compared to other insulation methods, such as shaft or housing insulation, etc. More cost effective and reliable. Insulated bearings have the same dimensions and basic technical features as non-insulated bearings Suitable for motors, generators, especially variable frequency motors.

CoatMaster (China Bearing manufacturer), As the exprienced Electrically Insulated Bearing manufacturer of China, Not only produce insulated deep groove ball bearing, insulated cylindrical roller bearing, insulated tapered roller bearing, insulated angular contact ball bearing and the other type of insulated bearing, but also supply complete and expert solution for electric motor and the other applications where need insulated bearing. if you have problem make you distracted about the insulated bearing, just contact with our bearing technical team.

MONTON bearing a main manufacturers leader of high precision bearings in China was established in 2001 locate in Luoyang--“Ancient Imperial Capital and Peony Flower City”,we specialized in the bearing production research and development more than 20 years , focus on the development of "High-tech, High precision, Advancing, customized" bearings development .MONTON covers an area of of 35000 sq.m., building area of 20000 sq.m., including office area 3000 sq.m., research and development center of 500 sq.m., and international marketing & reception center 2000sq.m.Our mission is to provide customers with complete solution, including design and development, manufacturing, testing and evaluation, and excellent after-sales service.The factory is located in the Bearing Industry Park of Yiyang County, Luoyang City, Henan Province.

MONTON bearing mainly produce high precision angular contact ball bearing, ball screw support bearing,Low temperature bearing,High speed motor bearings, military thin section ball bearing,special high precision bearing, crossed roller bearing,harmonic drive bearing,thrust bearing stack,Tungsten Carbide Radial Bearing, military thin section ball bearing,tandem bearing,cylindrical roller bearing, customized bearing and bearings parts, The bearing accuracy at P5/P4/P2 level, rolling elements from φ1mm to 160mm, precision degree Ⅰ、Ⅱ.We Contributions to important scientific research projects of several well-known universities, including Henan University of Science and Technology, Dalian University of Technology, Harbin Institute of Technology, Beijing University of Science and Technology, Beijing traffic University, and China Petroleum etc.

We produce bearings and parts with inner diameter of 1.5mm to an outer diameter of 3000mm. Our products have been widely used in important industrial fields such as CNC machine tools, high-speed spindles, precision measurement instruments, oil drilling, petrochemicals,Cryogenic pump, FANUC/Siemens motors, mining metallurgy, port machinery, medical equipment, extruder gearbox, Cement roller press, vertical mill, rocker arm, textiles equipment, paper mill,robotics, harmonic drive, concrete mixer trucks, steel mills, rolling mills,Wind Power,Continuous casting mill, UAV, Air Compressor,Tension levelers,LIDAR systems,missile tracking camera ,aerospace, etc.

Our company have very good products quality guarantee equipment, key equipment and instrumentation are imported or design special equipment for special procedure by us. Main instrumentation is Japan ACCRETECH, TAYLOR,ZEISS Germany etc. Established precision bearing product testing laboratory, we can test bearing performance and life,Passed ISO9001 quality system certification, with an annual production capacity of 1 million sets of various precision bearings.

MONTON owns CNC lathes, machining centers, CNC grinding machines, and ultra precision equipment more than 160 sets. 10 CNC lathes, 65 CNC precision grinding machines, and 1set 4-axis machining center. 2 sets Ultrasonic cleaning line and equipment,2 sets tempering and stabilizing furnaces,1set heat treatment furnace，1sets low temperature stabilization equipment and vacuum equipment,8 production lines of automatic assembly.Inspection equipment include Mitotoyo Japan Contour,roundness measuring instrument,hardness tester,coordinate measuring instrument, length measuring instrument,vibration measuring instrument,contact angle goniometer,Bearing convexity value measuring instrument,hardness tester,Metallographic tissue measuring instrument,Clearance measuring instrument,height measuring instrument,Inner diameter outer diameter and rotation accuracy measuring instrument etc.

We have more than 140 employees, including 10 technical persons and 25 inspection persons. There are 5 persons with a master's degree, 25 persons with bachelor's degree, and 30 with vocational degree currently .

With advanced production equipment and perfect testing technology, MONTON can guarantee the quality and accuracy of the products we produced. Our technical department can efficiently complete the bearing design according to customer needs, and customers who need non-standard bearings can also enjoy customized services. Our quality system regularly monitors various production facilities and complies with strict quality requirements. All material certificates and certification reports are kept in files. Products are traceable and can be provided on request. Therefore, we are confident to provide the best solutions for global customers. Our company can design non-standard bearings and special application bearings for customer, as well as customized products with samples!

We are innovative, motivated and courageous to provide our customers with necessary solutions. Our management and employees are always ready to provide professional and personalized services to our customers. In the future, MONTON will adhere to the brand development strategy, strengthen the research and development of high-end products, strive to build a digital factory, and join hands with more partners to work together for a better future!

Company spirit: Honesty, Trustworthiness and Mutual benefit;

Company policy: Quality-oriented;

Company Business philosophy: Honesty,fulfill promise;

Company principle: Solve problems for customers and prioritize customer service at first.

We warmly welcome all friends come to visit us, study or business negotiation.