6.2 Centrifuge
Illustration 6.2 Centrifuge with Brake Resistor
Braking of a centrifuge is a typical application of brake
resistors, shown in
The formula for energy dissipation (E
b
) to the brake resistor
is:
Eb
= 0.0055 ×
jc
×
n
22 + 0.0055 ×
jM
×
n
12 ×
η
M
Ws
where
m = weight of the centrifuge content [kg]
j
C
= centrifuge inertia [kgm
2
] = 0.5 x m (r
12
+ r
22
)
j
M
= gear motor inertia [kgm
2
]
η
M
= gear motor efficiency
n
1
= max. motor speed [rpm]
n
2
= max. centrifuge speed [rpm]
R
b
= brake resistor
6.3 Continuous Braking
To achieve continuous braking, select a brake resistor in
which the constant braking power does not exceed the
average power P
avg
of the brake resistor.
NOTICE
Contact the Danfoss distributor for further information.
Application Examples
Design Guide
MG90O202
Danfoss A/S © Rev. 05/2014 All rights reserved.
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Summary of Contents for VLT Brake Resistor MCE 101
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