Calculation of number of turns for armature banding
To calculate the number of turns of INTAF Polyglass Tape for any particular application.
Determine the tangential force F which the banding will have to withstand by using the formula:
P x R x N2
F (kg) = ---------
5.6 x 106
P = weight of windings in kg exposed to the centrifugal force; normally is only end winding of the rotor/armature
R = maximum distance, in mm between windings and axis of rotation
N = number of revolutions per minute, at the maximum speed of rotation reached by motor
The number of turns of INTAF Polyglass Tape to be applied is obtained from the following:
F x Ks
N = ------
C x L
F = the force in kg determined above
Ks = the safety factor normally used (eg. Ks = 5)
C = tensile breaking stress of the tape, in kg/cm (180 kg/cm at operating temperature)
L = width, in cm. of the tape used for banding.
To compensate for some of the loss of tension it is normal to increase the calculated number of turns by a factor of 2 to 3.
Converting steel banding of Polyglass Tape
Wire band strength = Turns x Ultimate tensile strength
Now divide the wire band strength by the tensile strength of the selected banding tape material to determine the number of turns to use for an equivalent fiberglass band.
Wire Band Strength
------------------------------- = Turns (banding tape)
Tensile strength (banding tape)
The choice of glass banding tape should take into account the temperature and humidity of the application. High humidity banding material, for example, is manufactured using special moisture-resistant yarn. Other glass banding materials may be better suited for different environmental conditions or for higher or lower speed applications.
Click here to know "Why INTAF Polyglass Tape is better than Steel Banding ?"