Increasing The Motor Output Torque Further In Low Speed Range - Toshiba TOSVERT VF-PS1 Instruction Manual

6.20

Increasing the motor output torque further in low speed range

: Exciting strengthening coefficient
: Stall prevention factor
The output torque of the motor can adjusted using the parameters described in 6.19 in most cases, but if a finer
adjustment is required, use these parameters.
[Parameter setting]
Title
Exciting strengthening coefficient
Stall prevention factor
If the torque needs to be increased in low speed range (10Hz or less as a guide)
Perform auto-tuning according to the instructions in 6.19, and if the torque needs to be increased further in low speed
range, first increase the slip frequency gain (
does not occur. Then, increase motor constant 1 (
needs to be increased even further, increase the exciting current factor (
a parameter that increases the magnetic flux of the motor at low speeds, so specifying a higher value for
increases the no-load current. If the no-load current exceeds the rated current, do not adjust this parameter.
If the motor stalls when operated at frequencies above the base frequency
Adjust (stall prevention factor).
If a heavy load is applied momentarily (transiently), the motor may stall before the load current reaches the stall
prevention level (
Function
~
) to a degree (80% or so as a guide) that hunting of the motor
). In such a case, a motor stall may be avoided by reducing the value of
F-39
Adjustment range
~ %
) by 1.1 times the current value as a guide. If the torque
) to a maximum of 130%.
E6581531
Default setting
is
gradually.
6