Examples of installation & Application
Basic Design and Operation Structure Examples of installation & Application
How To Select :
Model selection in a basis of tension1-1 Three factors must be determinated, the formula is listed below:
a.Torque T= F*(D/2)…………………………………… (Nm)
b.Speed N=V /(π*D)……………………………… (r/min)
c.Kinetic Power P=0.105*T*Nr …………………………… (W)
F: tension(N) V: Linear Velocity(m/min) D: Roller Dia(m)
Nr: Slip Speed of clutch/brake (r/min) (Clutch: speed difference at clutch input and clutch output; Brake: speed at brake input)
1-2 The general instruction for selection of specification of clutch/brake：
Confirm the use condition (linear speed、tension、roller Dia.) → Calculate the Maximum kinetic power (watt) → Calculate the roller torque → Calculate the roller speed → Calculate the clutch/brake torque → Calculate the clutch/brake speed → Calculate the clutch/brake slipping speed → Clutch/brake model is selected
Notes for Selection2-1 Torque：The adjustable torque range of hysteresis clutch/brake is between drag torque and rated torque. Please do consider the clutch/brake torque (maximum and minimum) is within the adjustable torque range (as close to the rated torque as possible). The optimized use is within 3%~100% of the torque range.
2-2 Speed： The maximum clutch/brake speed must be lower than the allowable speed.
2-3 Kinetic Power：Continuous slip causes high heat on hysteresis clutch/brake. Please note that the kinetic power during operation must be less than the allowable kinetic power of selected clutch/brake model.
Example of Model SelectionTake the film roller as the output of hysteresis brake to explain how to select hysteresis brake.
Given:
Linear Velocity =200m/min consistent，Tension F=2.0N consistent
Roller Dia. D=500mm
Calculation:
a.Toqure (T)：Torque (at the beginning and the end of operation) at tension 100N
T=(D/2)*F=[(500*10^-3)/2]*2=0.5 Nm
b.Speed (N)：Brake speed (at the beginning and the end of operation) at linear velocity 200m/min
N=V/(π*D1)=200/(π*500*10^-3)=128 r/min
c.Kinetic Power (P)
P=0.105*T*Nr=0.0167*F*V=0.0167*2*200=6.68 W
d.Model Selection
Calculated torque is 0.5NM which is 50% of the rated torque of CHB010AA. Per calculated torque (T) and kinetic power, CHB010AA is selected.
Example 2:
Given (please refer to the diagram below)
Maximum Linear Velocity (Vmax)=350m/min,
Minimum Linear Velocity (Vmin)=250m/min
Maximum Roller Dia. (D1)=550mm, Minimum Roller Dia. (D2)=100mm
Tension F= 5N consistent, Reduction Ratio 2:1
Calculation：
a. Brake Torque (T) and Brake Speed (N) at the start
T=(5*550*10^-3)/2=1.38 Nm
a-1.Brake Torque (T) at increasing ratio 1: 2
T=1.38*(1/2)=0.69 Nm
N=350/(π*550*10^-3)=202.7 r/min
a-2.Brake Speed (N) at increasing ratio 1: 2
N=202.7*2=405.4 r/min
b. Brake Torque (T) and Brake Speed (N) at the end of operation
T=(5*100*10^-3)/2=0.25 Nm
b-1.Brake Torque (T) at increasing ratio 1: 2
T=0.25*(1/2)=0.125 Nm
N=350/(π*100*10^-3)=1115 r/min
b-2.Brake Speed (N) at increasing ratio 1: 2
N=1115*2=2230 r/min
c. Maximum and Minimum Speed
Nmax=350/(π*100*10^-3)*2=2230 r/min
Nmin=250/(π*550*10^-3)*2=290 r/min
d. Maximum and Minimum Brake Torque
Tmax=(5*550*10^-3)/2*(1/2) =0.69Nm
Tmin=(5*100*10^-3)/2*(1/2)=0.125 Nm
e. Maximum Kinetic Power
Pmax=0.0164*5*350=28.7 W
f. Model Selection
Calculated maximum kinetic power: 28.7W -> less than 38W
Calculated maximum brake torque: 0.69NM -> less than 1.0NM
CHB010AA is selected
Diagram 1
Operating Guidelines ShaftPlease do not knock the brake shaft. Refer tolerance to H7/h7 for install shaft, and do pay attention to the concentricity and perpendicularity between two shafts when they are connected.
Mounting screwsPlease use anti-loose washers or adhesives on mounting screws to prevent screws from loose when vibration.
Installation surfaceThe tolerance of perpendicularity and concentricity between mounting flange and shaft must be within 0.05mm T.I.R. to keep the rotor from rubbing the inner/outer poles.
Residual magnetismAfter the operation is stopped, due to residual magnetism torque will still remain at low-speed rotation. Please cut off the power and keep running brake at approx 100 rpm for 1 minute to eliminate the residual magnetism.
