Self-calibration of ECM motor and variable frequency drive inferred torque
OwnerWayne N. Kraft, Chuan Yaninventors
Life of this patent
Estimating the term…
Abstract
A method for calibrating a motor is provided. The method includes defining a reference speed for operating the motor; operating the motor until a first operating point at which the motor reaches the reference speed; measuring a first current of the motor and an angular acceleration associated with the first current at the first operating point; operating the motor until a second operating point at which the motor reaches the reference speed; measuring a second current of the motor at the second operating point; and estimating a calibration coefficient for calibrating the motor based at least on the first current, the second current, and the angular acceleration associated with the first current.
Claims14
A control system, comprising:
- a motor;
- and
- a control unit communicatively coupled to the motor, the control unit being configured to calibrate the motor by:
- defining a reference speed for operating the motor;
- during a first time period, accelerating or decelerating the motor through the reference speed;
- measuring a first current of the motor and an angular acceleration when the motor achieves the reference speed during the first time period;
- during a second time period, maintaining the motor in a steady state at the reference speed;
- measuring a second current of the motor when the motor is at the reference speed during the second time period;
- and
- estimating a calibration coefficient for calibrating the motor based at least on the first current, the second current, and the angular acceleration.
A method for calibrating a motor, the method comprising:
- defining a reference speed for operating the motor;
- during a first time period, accelerating or decelerating the motor through the reference speed;
- measuring a first current of the motor and an angular acceleration when the motor achieves the reference speed during the first time period;
- during a second time period, maintaining the motor in a steady state at the reference speed;
- measuring a second current of the motor when the motor is at the reference speed during the second time period;
- and
- estimating a calibration coefficient for calibrating the motor based at least on the first current, the second current, and the angular acceleration.
A non-transitory computer medium storing computer readable instructions executable by a processor to implement a method for calibrating a motor, the method comprising:
- defining a reference speed for operating the motor;
- during a first time period, accelerating or decelerating the motor through the reference speed;
- measuring a first current of the motor and an angular acceleration when the motor achieves the reference speed during the first time period;
- during a second time period, maintaining the motor in a steady state at the reference speed;
- measuring a second current of the motor when the motor is at the reference speed during the second time period;
- and
- estimating a calibration coefficient for calibrating the motor based at least on the first current, the second current, and the angular acceleration.
Dependencies are inferred from the claim text.