Method for calibrating constant torque of electronically commutated motor

A method for calibrating constant torque of an electronically commutated motor (ECM), the method being applied to replacing a legacy motor with a new motor, both the new motor and the legacy motor being constant torque-controlled ECMs, and the method for calibrating constant torque of the new motor comprising:

• a) selecting m torque reference points based on torque values of the legacy motor to form a desired torque value array LUT_X[m], where m≥3, LUT_X[1] is a minimum torque value of the legacy motor, LUT_X[max(m)] is a maximum torque value of the legacy motor, m is an integer, and max(m) is a maximum value of m;
• b) based on an actual torque of the new motor, identifying m torque adjustment points, wherein torque values of the torque adjustment points have a one-to-one correspondence with torque values of the torque reference points, to form a new target torque value array LUT_Y[m];
• and
• c) receiving an externally input target torque T0, invoking a linear interpolation module function associated with the desired torque value array LUT_X[m] and the new target torque value array LUT_Y[m] to obtain a corresponding new torque target value T1, and allowing the new motor to operate under constant torque control using the new torque target value T1.