6-3
Sensorless Vector Control
A characteristic of an induction motor is that its rotation speed drops when output torque increases.
When sensorless vector control is selected, the relationship between the output torque and rotation
speed of an induction motor can be improved and high torque can be output even at low speeds.
Sensorless vector control enables a high starting torque of 200% to be output at 0.5 Hz.
An auto-tuning function (rotation method, stop method) that automatically sets motor constants also is
mounted on the inverter.
6-3-1
Sensorless Vector Control Parameter Settings
• Set the 1st Drive Control Selection (F42)/2nd Drive Control Selection (A14) to “5: IM Vector control
without speed sensor.”
• Set 1st Motor Capacity (P02)/2nd Motor Capacity (A16), 1st Motor Pole Number (P01)/2nd Manual
Torque Boost Voltage (A05), 1st Motor Rated Current (P03)/2nd Motor Rated Current (A17) accord-
ing to the motor in use.
• When rotation tuning is not possible, set 1st Motor Armature Resistance (P06)/2nd Motor Armature
Resistance (A20) by the formula below. When rotation tuning is possible, setting is not required.
• Set the rated frequency of the motor to 1st Base Frequency (F04)/2nd Base Frequency (A02), and
set the motor rated voltage to 1st Rated Voltage at Base Frequency (F05)/2nd Rated Voltage at
Base Frequency (A03). If the motor synchronous speed can be confirmed, set the value calculated
by the formula below to F04/A02.
× Number of poles
Synchronous speed
120
• To use this function, set the motor constants of the motor in use according to 6-3-2 Motor Parameter
Settings on page 6-17.
• Motor magnetic flux is controlled according to the instructed torque by setting “1: Enable” in Magnet-
ic Flux W
eakening Control Function Selection (d82). When the instructed torque is small, motor
magnetic flux is weakened and stability of control is improved with Magnetic Flux Weakening Lower
Limit (d83) as the lower limit.
• Set the magnetic flux weakening lower limit value in % units in Magnetic Flux Weakening Lower
Limit (d83). If the lower limit value is set to too low, there is the risk of the problems of hunting and
speed delay.
Use the lower limit value at its factory default (40%) as far as feasibly possible.
6 Vector Control and Applied Functions
6-16
M1 Series Standard Type User's Manual (I669)
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