MOTOR CONTROLLER SYSTEM AND METHOD FOR MAXIMIZING ENERGY SAVINGS
First Claim
1. A system for controlling an AC induction motor to maximize energy savings compromising:
- a means for connecting a motor controller to an AC induction motor;
a means for placing a load on said AC induction motor;
a means for removing a load from said AC induction motor;
a means for sweeping a control space of the AC induction motor and taking measurements of operating parameters of the AC induction motor;
a means for establishing a control line from said measurements;
a means for storing said control line in said motor controller;
a means for controlling said operating parameters; and
a means for performing closed-loop control of said AC induction motor to keep the motor running in accordance with said control line.
2 Assignments
0 Petitions
Accused Products
Abstract
A motor controller (4) and method for maximizing the energy savings in an AC induction motor (3) at every load wherein the motor is calibrated at two or more load points to establish a control line (6), which is then programmed into a non-volatile memory (30) of the motor controller. A DSP-based closed-loop motor controller observes the motor parameters of the motor such as firing angle/duty cycles (23), voltage (37), current (9) and phase angles to arrive at a minimum voltage necessary to operate the motor at any load along the control line. The motor controller performs closed-loop control to keep the motor running at a computed target control point, such that maximum energy savings are realized by reducing voltage through pulse width modulation.
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Citations
43 Claims
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1. A system for controlling an AC induction motor to maximize energy savings compromising:
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a means for connecting a motor controller to an AC induction motor; a means for placing a load on said AC induction motor; a means for removing a load from said AC induction motor; a means for sweeping a control space of the AC induction motor and taking measurements of operating parameters of the AC induction motor; a means for establishing a control line from said measurements; a means for storing said control line in said motor controller; a means for controlling said operating parameters; and a means for performing closed-loop control of said AC induction motor to keep the motor running in accordance with said control line. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A method for controlling an AC induction motor to maximize energy savings comprising the steps of:
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a. connecting a motor controller to an AC induction motor; b. sweeping a control space of the AC induction motor and observing and measuring operating parameters of the AC induction motor throughout the control space; c. establishing a control line for said AC induction motor from said parameters; d. storing said control line in said motor controller; e. controlling the operating parameters along the control line; and f. performing closed-loop control of said AC induction motor to keep the motor running in accordance with said control line. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43)
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Specification