Siemens EK 726 Series Wartungshandbuch PDF herunterladen (Seite 23)

TECHNICAL DESCRIPTION

MICROMASTER

MICROMASTER Vector

MIDIMASTER Vector

SIEMENS DA 64 – 2002/2003

2/9 Version D

2.5 Diagrams of COMPOUND BRAKING

, DC current and regenerative braking

Regenerative braking

· Energy is dissipated in an external resistor

· Excellent braking torque

· Smooth

· Controlled

· Speed is reduced linearly and smoothly

DC injection braking

· Energy is dissipated in the motor

· Poor braking torque

· Smooth

· Ramp-down is not controlled

· 30 - 40 % of the effectiveness of regenerative braking

· There is no defined motor stop

COMPOUND BRAKING™

· Energy is dissipated in the motor

· Good braking torque

· Controlled

· 50 - 60 % of the effectiveness of regenerative braking

· Speed is linearly reduced

· Low speed fluctuations due to the oscillating torque –

depending on the load moment of inertia

Torque

Time

Speed

Time

Torque

Time until the motor flux

currents have decayed

Time

Speed

Rapid speed

decrease due to

peak braking torque at

low frequencies

Time

The motor direction of rotation

can be reversed

orque

Time

Speed

Time

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 119 120

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