De exemplu, with electric motors capable of spinning at 30,rpmhigh performance bearings are required in order to keep up with the high speeds.
In order to adapt to requirements of EVs, bearing technology is changing, with suppliers looking to provide OEMs with more powerful and durable components. What are the main developments in optimised bearings and how can they boost electric motor performance?
OEMs have required a significant quality and performance jump in order to be able to offer their customers reliable EVs. Therefore, suppliers are redesigning bearings and the polymer cage so the whole set-up can endure the inova webinar de slabire speed, acceleration and temperature that characterize electric motor operation. Further, the higher speeds demand more effective lubrication with superior oils that can maintain their viscosity.
However, there is lack of consensus among OEMs on targets for electric or thermal conductivity.
Motor output speeds may exceed 25,rpm, which would require that associated bearings, seals and other components are properly lubricated. However, whilst the eMotor and the inverter can offer great efficiency, one feature that can affect conventional steel bearings is the high-frequency voltage switching of the inverter that produces current leakage, particularly at high motor speeds. This current slabire hifi bare runs through the actual bearings causing surface pitting and, shortly afterward, a catastrophic failure of the component.
The problem is very much accelerated by the vast use of frequency converters working at still-higher frequencies and hence creating common mode voltages difficult to insulate exactly because of the high frequent nature of the same. With the property of being current insulating, hybrid bearings are 40 percent less dense when compared to those made of steel.
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This allows them to operate in lower temperatures, require less lubrication and have up to ten times the lifetime of steel bearings. According to a study of the Danish Institute of Technology DTIdue to the reduced friction in a ceramic hybrid bearing, the running temperature could be anywhere between 10 and 40 kelvin cooler than the equivalent standard bearing in the same motor.
This enables a longer service life of both the grease, the bearing and ultimately the motor. In comparison with the 0.
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Rulmenți cu role conice Another bearing technology taking the EV industry by storm is the tapered design. It has been developed to improve efficiency and reduce size, as bearings with this design are small and offer low energy loss. However, tapered roller bearings are vulnerable to damage from sliding contact if they inova webinar de slabire lubrication.
This makes it difficult to significantly simplify lubrication systems and reduce the amount of oil used. To overcome lean lubrication conditions, NSK developed a special cage that retains and distributes oil in fine grooves via capillary action. There are also challenges to starting the vehicle at lower temperatures, such as a dramatically increased oil viscosity leading to difficulty in supplying oil to the bearings.
Compared to [its] conventional tapered bearings, [its] new product requires 95 percent less lubrication oil to prevent seizure. This enables a smaller pump to be used and eliminates churning loss. In order to reduce noise, a high-precision machining method is used to give the ends of the needle rollers a curved arc. This also makes the bearings capable of supporting heavy loads.
Rulmenții E-Drive ating un alt nivel
As a result, the solution is perfect for electrical components mounted in vehicles with extremely quiet interiors, such as electric and hybrid vehicles. The switch to electric vehicles has certainly driven an industry-wide rethink when it comes to componentry.
Even the humble bearing has been forced to shape up for its new role as part of the EV powertrain as, without reliable operation, customers will vote with their feet, and without quietness, EVs lose an important USP.