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UNIFREM v.3.41x
10 May 2017
Page 139 from 180
Typical current and frequency course when MCC takes up on a drive with a flywheel
Example:
Current limit (MCC) takes up on a real drive:
Maximal current at ramp-down,
regenerative mode
Maximal current at ramp-up, motoric mode
chod
8.5 Resonance damping
Motor resonance is a phenomenon, when motor fed by the converter is vibrating and periodically
moving between regenerative and motoric operating mode caused by the influence of
inhomogenity of air gap or load non-.
The period of these oscillations is usually only a few periods of the stator frequency. Resonance
results in a vibration of mechanical parts, increasing their stress and vibration in the DC link
voltage, motor current, and subsequent failures.
FREQUENCY
LIMITED MOTOR CURRENT
FREQUENCY
LIMITED MOTOR CURRENT
t [s]
START
F
SETPOINT
F [Hz]
STOP
Current MT
[A]
RAMP-DOWN
–
regenerative
mode
cos(
φ
) < 0
RAMP-UP
–
motoric
mode
cos(
φ
) > 0
Max.mot.current
PAR. ID = 5
Max.regen.current
PAR. ID = 549
Содержание Quatrofrem Series
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