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Why does the output shaft rotation speed listed in the catalog differ from the output shaf

Q: Why does the output shaft rotation speed listed in the catalog differ from the output shaft rotation speed obtained by dividing the motor's rated rotation speed by the reduction ratio?

 

A: The output shaft rotation speed listed in the catalog is obtained by dividing the rotation speed N of the rotating magnetic field by the reduction ratio. For this reason, these numbers serve as the designated rotation speed and differ from the actual observed speed. Rotation speed data in the catalog is intended to serve as an aid in the selection of a reduction ratio.
手机app软件下载For more information, see below:

Motor (induction motor) rotation speed:n

手机app软件下载The rotation speed of an induction motor must be delayed somewhat relative to the rotating magnetic field created by the stator. This characteristic can be expressed as the following formula:

n =(1-S)×N

N : Rotation speed of rotating magnetic field
(Reference) For a 4-pole motor, 50Hz: N = 1,500 rpm; 60Hz: N = 1,800 rpm
S手机app软件下载 : Slip ratio (0<S<1)

The relationship of n and N手机app软件下载 in the above formula provides the reason for the difference in the output shaft rotation speeds.

Output shaft rotation speed listed in catalog = N/Reduction ratio
Output shaft rotation speed calculated from motor's rated rotation speed = n/Reduction ratio

*Motor rated rotation speed
The motor rated rotation speed indicates the rotation speed when the motor is operated at its rated output and voltage.

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