Dalan Motor understands the relationship between vertical three-phase asynchronous motors and thrust bearings, do you fully understand?
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Deep groove ball bearings cannot bear heavy axial loads, so angular contact ball bearings (also known as thrust bearings) are mainly used as positioning bearings in vertical three-phase asynchronous motors. It requires high axial load carrying capacity and speed performance. Today, the editor of Dalan Motor takes everyone to know it.
1. Classification and application of angular contact ball bearings:
Angular contact ball bearings have 7000C type (∠= 15 °), 7000AC type (∠= 25 °) and 7000B (∠= 40 °). Generally, the inner and outer rings of this type of bearing cannot be separated, and they can withstand combined radial and axial loads and axial loads in one direction. The ability to withstand axial loads is determined by the contact angle. The greater the contact angle, the higher the ability to withstand axial loads. This type of bearing can limit the axial displacement of the shaft or housing in one direction.
Single row angular contact ball bearings are mainly used in machine tool spindles, high-frequency motors, gas turbines, centrifugal separators, small car front wheels, differential pinion shafts, booster pumps, drilling platforms, food machinery, indexing heads, repair welding Machines, low-noise cooling towers, electromechanical equipment, coating equipment, machine tool slot plates, arc welding machines and other equipment. The bearings commonly used in vertical motors are single-row angular contact ball bearings.
2. Single-row angular contact ball bearings for vertical motors:
The bearings installed by vertical motors are related to the power and center height of the motor itself. Vertical motors of H280 and below generally use deep groove ball bearings, and H315 and above motors use angular contact bearings. High-precision and high-speed bearings usually take a contact angle of 15 degrees. Under the action of axial force, the contact angle will increase.
When using angular contact ball bearings for vertical motors, angular contact ball bearings are generally installed at the non-shaft extension end to ensure that the shaft extension end bearing bears the radial force requirements. However, angular contact ball bearings are installed with strict directional requirements, to ensure that the bearing can withstand the axial force in the downward direction, which is consistent with the direction of the rotor's gravity.
Simply put, if the angular contact ball bearing is above, make sure that the bearing "hangs" the rotor; if the angular contact ball bearing is below, make sure that the bearing can "support" the rotor. However, under the premise of meeting the above functional requirements, the assembly processability of the end cover must also be considered, that is, the external force when the end cover is assembled is consistent with the axial force that the bearing can bear (the shaft that the inner ring and the outer ring of the angular contact ball bearing can withstand) The direction of the force is opposite), otherwise the bearing will be pushed away.
According to the above rules, when the vertical motor shaft is extended upward, the angular contact bearing is installed at the non-axial extension end, which satisfies the axial force, and also ensures the assembly process of the end cover; when the vertical motor shaft extends downward Also, the angular contact bearing is installed at the non-shaft extension end, but the end cover must be assembled with appropriate measures to ensure that the bearing is not damaged.
----- Responsible Editor: Dalan Oil Pump Motor 02-Procurement Consultant
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