Power to overcome bearings resistance

In summary, the conversation discusses estimating the power needed to overcome the resistance of NSK Super Precision Angular Contact Ball Bearings when spinning at a given speed. The speaker mentions a product catalog from NSK's website that contains technical data and a formula for calculating dynamic torque. They also bring up a concern about the dimensional analysis of the formula.
  • #1
Sunfire
221
4
Hello,

I have a pair of bearings (NSK Super Precision Angular Contact Ball Bearings) and was wondering whether I would be able to estimate the power it takes to overcome the bearings resistance when the shaft spins with some given rpm.

Are you aware if this is possible to estimate. Thanks!
 
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  • #2
Download the product catalog from the NSK website. That has the technical data to answer the question.
 
  • #3
Here is the catalog info...
 

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  • #4
Sunfire said:
Here is the catalog info...
... and the formula using the factor f_0 is in Part 5 Section 6.
 
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  • #5
Thank you :smile:

The dynamic torque is given by a load term and a speed term.
The speed term is:
##M_v = f_0 (v_0 n)^{2/3} d_m^3##, but its dimensional analysis has left me wondering.

##M_v## - dynamic torque, dimension [N.m]
##f_0## - some factor, dimensionless
##v_0## - kinematic viscosity, [##m^2##/s]
##n## - speed, [?]
##d_m## - pitch circle diameter of rolling element, [m]

Lhs requires a [kg] to appear somewhere in the Rhs. Probably something is amiss with the above expression. I cannot imagine [kg] has anything to do with the "speed" ##n##?
 

1. What is "Power to overcome bearings resistance"?

The term "Power to overcome bearings resistance" refers to the amount of force required to overcome the resistance and friction in a bearing system. This can include factors such as the weight of the object being moved, the type and quality of the bearing, and the environment in which the bearing is operating.

2. Why is it important to understand the power to overcome bearings resistance?

Understanding the power to overcome bearings resistance is important because it allows us to accurately calculate the amount of force needed to move an object and ensure that the bearing system is functioning properly. This knowledge can also help us identify and troubleshoot any issues or inefficiencies within the system.

3. How is the power to overcome bearings resistance calculated?

The power to overcome bearings resistance is typically calculated using the formula P = F x V, where P is power, F is the force needed to overcome resistance, and V is the velocity at which the bearing is moving. This formula takes into account both the force and speed of the bearing to determine the required power.

4. What factors can affect the power to overcome bearings resistance?

There are several factors that can affect the power to overcome bearings resistance, including the type and quality of the bearing, the weight and size of the object being moved, the speed at which the bearing is moving, and the environmental conditions such as temperature and humidity. It is important to consider all of these factors when calculating the power needed for a bearing system.

5. How can the power to overcome bearings resistance be reduced?

There are a few ways to reduce the power needed to overcome bearings resistance. One way is to use high-quality bearings that are designed for the specific application and can withstand higher loads and speeds. Proper lubrication and maintenance of the bearings can also help reduce friction and resistance. Additionally, reducing the weight of the object being moved or adjusting the speed of the bearing can also help reduce the power needed to overcome resistance.

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