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US 7,193,385 B2Granted
Digital control of motor drives
AssigneeIllinois Institute of Technology
InventorsAli Emadi, Fernando Rodriguez, Piyush C. Desai
Life of this patent
Estimating the term…
Abstract
A digital controller is easily implemented for variable speed or torque control of an electric motor or generator by using a comparator to determine a choice of control state outputs.
Claims19
A variable speed or torque controller for a variable speed or torque electric machine, comprising:
- an actual machine operating value input;
- a machine value set-point input;
- a comparator for determining if the actual machine operating value is less than or greater than the machine value set-point input;
- a binary pair of first and second active machine control states;
- the first machine control state having first predetermined parameters for running the machine at a first operating state value which drives operation of the electric machine in a first direction towards the machine value set-point, and the second machine control state having second predetermined parameters for running the machine at a second operating state value which drives operation of the electric machine in a second direction towards the machine value set-point;
- and
- instructions for selecting the first machine control state to implement the first predetermined parameters if the actual machine value is greater than the machine value set-point input, or selecting the second machine control state to implement the second predetermined parameters if the actual machine operating value is less than the machine value set-point input.
4 more elements
A variable speed or torque controller for a variable speed or torque electric machine, comprising:
- an actual machine operating value input;
- a machine value set-point input;
- a comparator for determining if the actual machine operating value is less than or greater than the machine value set-point input;
- a first active machine control state, the first machine control state having predetermined parameters for running the machine at a first operating state value comprising a predetermined low speed or torque value;
- a second active machine control state, the second machine control state having predetermined parameters for running the machine at a second operating state value comprising a predetermined high speed or torque value;
- and
- instructions to implement the first machine control state if the actual machine value is greater than the machine value set-point input, or to implement the second machine control state if the actual machine operating value is less than the machine value set-point input.
4 more elements
Dependencies are inferred from the claim text.