Hybrid closed loop speed control using open look position for electrical machines controls
AssigneeCaterpillar Inc.
InventorsJackson Wai, Jesse Gerdes, James Michael Thorne
Life of this patent
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Abstract
A method of controlling speed of an electric machine having a rotor and a stator is provided. The method may comprise the steps of monitoring a desired speed and a measured speed of the rotor, generating a torque command based on the desired speed and the measured speed, and controlling phase current to the stator based on a hybrid closed loop analysis of the torque command, the measured speed and an estimated position of the rotor. The estimated rotor position may be derived at least partially from the desired speed.
Claims20
A method of controlling speed of an electric machine having a rotor and a stator, comprising the steps of:
- monitoring a speed command and a measured speed of the rotor;
- generating a torque command based on the speed command and the measured speed;
- and
- controlling, at a controller, phase current to the stator based on a hybrid closed loop means of analyzing the torque command, the measured speed and an estimated position of the rotor, the estimated rotor position being derived at least partially from the speed command.
A method of controlling speed of an electric machine having a rotor and a stator, comprising the steps of:
- monitoring a speed command and a measured speed of the rotor;
- generating a torque command based on the speed command and the measured speed;
- determining an estimated position of the rotor based at least partially on the speed command;
- and
- determining, at a controller, current control parameters for controlling a phase current to each phase of the stator based on a hybrid closed loop means of analyzing the torque command, the measured speed and the estimated position of the rotor.
A control system for controlling speed of an electric machine having a rotor and a stator, comprising:
- a converter circuit operatively coupled to the stator, the converter circuit including a plurality of switches selectively communicating current with each phase of the stator;
- and
- a controller in communication with each of the stator and the converter circuit, the controller being configured to generate a torque command based on a difference between a speed command and a measured speed, and control the switches based on a hybrid closed loop means of analyzing of the torque command, the measured speed and an estimated position of the rotor, the estimated rotor position being derived at least partially from the speed command.
Dependencies are inferred from the claim text.