Acceleration estimator for speed rate control
AssigneeDRS Power & Control Technologies, Inc.
InventorDavid J. Gritter
Life of this patent
Estimating the term…
Abstract
Embodiments of the present invention are directed to a controller that is configured to limit the rate of change of speed of a motor (e.g., the acceleration or deceleration) regardless of the operating mode of the motor (e.g., speed, torque, or power control mode). The controller can include an acceleration estimator which monitors the output speed of a motor and provides an acceleration-limited speed set point. The output of the acceleration estimator may be limited to a range of acceptable acceleration values that correspond to the required limits of acceleration and deceleration. The acceleration estimator can be configured such that it causes the speed regulator to override the torque and/or power regulators when the acceleration range is exceeded.
Claims20
A method, comprising:
- measuring, by a speed sensor, an output speed of a motor;
- receiving, by an acceleration estimator, the output speed;
- determining, by the acceleration estimator, an acceleration estimate based on the output speed;
- determining, by the acceleration estimator, that the acceleration estimate is outside a preset range;
- calculating, by the acceleration estimator, a speed estimate based on a maximum acceleration value from the preset range;
- and
- generating a speed set point based on the speed estimate.
A system comprising:
- an electric motor;
- a controller operable to receive a plurality of reference signals and a plurality of output signals from the electric motor, and further operable to output a control signal to the electric motor, wherein the controller comprises a plurality of regulators and an acceleration estimator;
- the acceleration estimator configured to
- receive an output speed signal from the electric motor;
- determine an acceleration estimate based on the output speed signal;
- determine that the acceleration estimate is outside a preset range;
- and
- calculate a speed set point based on a maximum acceleration value from the preset range.
An acceleration estimator, comprising:
- a first regulator, configured to output values in a preset range, wherein the first regulator
- receives an error signal representing the difference between an output speed of an electric motor and a speed set point;
- and
- outputs the acceleration estimate, wherein the acceleration estimate is limited to the preset range;
- a second regulator, configured to output an override signal;
- and
- an integrator that receives the acceleration estimate from the first limiting regulator and outputs the speed set point.
Dependencies are inferred from the claim text.