Lenze DSD - Manual (Page 326)

11 Drive Dimensioning
11.3 Mechanical brake selection
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Lenze · Drive Solution Designer · Manual · DMS 4.2 EN · 12/2013 · TD23
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11.3 Mechanical brake selection
There are two types of brakes for Lenze motors:
• Spring-applied brakes for three-phase AC motors and servo motors.
• Permanent magnet holding brakes for servo motors.
According to their function, the brakes are distinguished as follows:
The diagram below shows the braking torques of spring-applied brakes (BFK) and permanent mag-
net holding brakes (PMB) as a function of the motor speed.
[11-8] BFK and PMB diagram: braking torque as a function of the motor speed
Function Braking
(standstill/operating speed)
Cyclically recurring braking
Holding brake n = 0 No
Holding brake with safety function
• Do not use permanent magnet holding brakes for
hoist drives!
n = n
max
No
Service brake
• Dimensioning not possible in DSD.
n = n
max
Yes
100
M [%]
[n] 1000
20
50
100
3000 5000

Œ
Description
 Spring-applied brake
 Permanent magnet holding brake
M Braking torque [%]
• The rated torque (100 % = M
rated
) is valid if n = 100 rpm
n Motor speed