New Energy Vehicle Drive Motor Bearings
The bearing of the drive motor for new energy vehicles is a core component of the motor system. With the development of the industry, the rotational speed of the drive motor is getting higher and higher, and the dmn value has reached 1,200,000 mm.r /min. The bearing supports the rotor to rotate at high speed while bearing radial and axial loads. The performance of bearings directly affects the efficiency, NVH (noise, vibration, acoustic roughness) performance and reliability of the motor.
Types
FLT new energy drive motor bearings can provide various structural bearings, including but not limited to:
- Sealed deep groove ball bearing
- Unsealed deep groove ball bearing
- Ceramic rolling element hybrid bearing
Details
New energy drive motors are divided into two structures: water-cooled motors and oil-cooled motors. The lubrication of water-cooled drive motor bearings mainly relies on the lubricating grease inside the bearings. The heat generated by the motor itself and the frictional heat generated during high-speed rotation cause the internal heat of the bearings to reach a high temperature of 150℃, which puts forward higher requirements for the bearing grease. With the development of new energy vehicles towards multi-in-one drive, oil-cooled motors have become mainstream. As a result, the requirements for the processing accuracy, cleanliness and noise of bearings are getting higher and higher. The development of fast charging technology has enabled motor voltages to reach over 800 to 1000v, generating large currents that cause current corrosion to the bearings, thereby affecting their noise and service life.
The bearings of the drive motor must meet the requirements of high-temperature resistance ranging from -40℃ to +150℃, high-speed dmn value ≥ 1,200,000 mm.r /min, durability of 8 years or 300,000 kilometers, and rapid acceleration of over 4,000 RPM /S.
Features
Sealed deep groove ball bearing
The sealed deep groove ball bearing adopts a non-contact structure, with the groove curvature further optimized. The cage is made of high-strength and high-temperature resistant PA46+GF30 material or PEEK cage material. It is lubricated with wide-temperature grease, and features special heat treatment processes and high-precision parts processing techniques. The vibration and noise of the bearing reach V3/Z3 or above. This meets the high-performance requirements of the drive motor for the bearings.
Unsealed deep groove ball bearing
Unsealed deep groove ball bearing do not have sealing rings and grease. The groove curvature is further optimized. The cage is made of high-strength and high-temperature resistant PA46+GF30 material or PEEK cage material. The lubrication is done with gear oil. Special heat treatment processes and high-precision parts processing techniques have further improved the roundness, waviness, roughness and cleanliness of the bearing parts. The vibration noise of the bearing reaches V3/Z3 or above, meeting the requirements of new energy vehicles.
Ceramic rolling element hybrid bearing
The structure of the ceramic rolling element hybrid bearing is comparable to that of the standard deep groove ball bearing. The rolling elements are ceramic balls made of high-density silicon nitride Si3N4 material. These ceramic balls not only have the function of blocking current but also take into account the high-speed characteristics, and their performance is particularly outstanding in ultra-high-speed motors. It reduces the collision between the ball and the cage, and also meets the performance requirements of insulation to prevent electrical corrosion.
Applications
New energy vehicles include pure electric passenger vehicles, hybrid passenger vehicles, pure electric buses, pure electric logistics vehicles, pure electric commercial vehicles and electric forklifts, etc.
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