X20 system modules • Motor controllers • X20MM4456
X20 system User's Manual 3.10
1973
4.25.5.15.5.1 Current control
As its name suggests, mixed decay mode is a mix of "slow decay" and "fast decay". This occurs as follows:
A check is made at the beginning of each PWM cycle to determine if the actual current for the phases is below the
current setpoint. If this is the case, PWM is enabled (On) until the current setpoint is reached. If the current setpoint
has already been exceeded at the beginning of the PWM cycle (generator operation), the system immediately
switches to fast decay mode until the current setpoint is exceeded. The rest of the PWM cycle always takes place
in slow decay mode.
This also permits generator operation as long as the valid range for the supply voltage has not been exceeded
due to the regeneration into the DC circuit.
Current control in Mixed Decay mode
Fast decay
On
Slow decay
Slow
Decay
On
Slow decay
On
Slow decay
PWM
Frequency
Actual current
Current setpoint
Current control in Slow Decay mode
On
Slow decay
On
Slow decay
PWM
Frequency
Actual current
Current setpoint
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