Methods for identifying at least one parameter of a permanent magnet motor of an elevator, elevator drive units, and elevators

A method for identifying at least one parameter, including a magnetization-axis and a torque-axis inductances, of a permanent magnet motor of an elevator, the method comprising:

• applying, by a brake controller, at least one hoisting machinery brake to prevent rotation of a rotor of the permanent magnet motor;
• determining, by a first method, a mean value of motor inductance, as well as the magnetization-axis inductance and the torque-axis inductance as relative inductance values based on the mean value;
• determining, by a second method, being different than the first method, a mean value of motor main inductances, the motor main inductances being inductances between a first pair of phases of the permanent magnet motor;
• and
• determining absolute values of the magnetization-axis and the torque-axis inductances based on the motor main inductance obtained by the second method and the relative inductance values obtained by the first method.