Sensorless Vector Control; Sensorless Vector Control Parameter Settings - Omron M1 Series User Manual

7 Vector Control and Applied Functions
7-3

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.
7-3-1

Sensorless Vector Control Parameter Settings

• Set the 1st Drive Control Selection (3004Hex-2BHex)/2nd Drive Control Selection (3009Hex-0FHex)
to "5: IM Vector control without speed sensor."
• Set 1st Motor Capacity (3007Hex-03Hex)/2nd Motor Capacity (3009Hex-11Hex), 1st Motor Pole
Number (3007Hex-02Hex)/2nd Manual Torque Boost Voltage (3009Hex-06Hex), 1st Motor Rated
Current (3007Hex-04Hex)/2nd Motor Rated Current (3009Hex-12Hex) according to the motor in
use.
• When rotation tuning is not possible, set 1st Motor Armature Resistance (3007Hex-07Hex)/2nd Mo-
tor Armature Resistance (3009Hex-15Hex) by the formula below. When rotation tuning is possible,
setting is not required.
(3007Hex-04Hex)
• Set the rated frequency of the motor to 1st Base Frequency (3004Hex-05Hex)/2nd Base Frequency
(3009Hex-03Hex), and set the motor rated voltage to 1st Rated Voltage at Base Frequency
(3004Hex-06Hex)/2nd Rated Voltage at Base Frequency (3009Hex-04Hex). If the motor synchro-
nous speed can be confirmed, set the value calculated by the formula below to 3004Hex-05Hex/
3009Hex-03Hex.
Synchronous speed
120
• To use this function, set the motor constants of the motor in use according to 7-8-1 Motor Off-line
Auto-tuning on page 7-65 and 7-3-2 Motor Parameter Settings on page 7-17.
• Motor magnetic flux is controlled according to the instructed torque by setting "1: Enable" in Magnet-
ic Flux Weakening Control Function Selection (3014Hex-53Hex). When the instructed torque is
small, motor magnetic flux is weakened and stability of control is improved with Magnetic Flux
Weakening Lower Limit (3014Hex-54Hex) as the lower limit.
• Set the magnetic flux weakening lower limit value in % units in Magnetic Flux Weakening Lower
Limit (3014Hex-54Hex). 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.
7-16
2 2
-(3007Hex-38Hex)
× Number of poles
M1 Series EtherCAT Type User's Manual (I670)