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Application Examples
6.2 Centrifuge
Illustration 6.2 Centrifuge with Brake Resistor
Braking of a centrifuge is a typical application of brake
resistors, shown in Illustration 6.2.
The formula for energy dissipation (E
is:
2
2
Eb = 0 . 0055 × j c × n 2
j M × n 1
+ 0 . 0055 ×
where
m = weight of the centrifuge content [kg]
j
= centrifuge inertia [kgm
C
j
= gear motor inertia [kgm
M
η
= gear motor efficiency
M
n
= max. motor speed [rpm]
1
n
= max. centrifuge speed [rpm]
2
R
= brake resistor
b
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
of the brake resistor.
avg
NOTICE
Contact the Danfoss distributor for further information.
MG90O202
Design Guide
) to the brake resistor
b
η
M Ws
×
2
] = 0.5 x m (r
2
+ r
2
)
1
2
2
]
Danfoss A/S © Rev. 05/2014 All rights reserved.
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