Compensation of motor control using current-RPM relation for a ventilation system
First Claim
1. A method of controlling an electric motor for use in a ventilation system, the method comprising:
- providing a ventilation system comprising a blower and a duct with at least one opening, the blower comprising a motor and a fan coupled to the motor, the blower being configured to generate an airflow through the at least one opening;
conducting a test operation of the blower for collecting data indicative of the motor'"'"'s operation in the ventilation system;
processing the data collected from the test operation to generate a correction coefficient; and
conducting a feedback control using a target value, which has been modified using the correction coefficient,wherein the feedback control comprises a constant I·
RPM control to maintain a product of an electric current (I) and a rotational speed (RPM) within proximity of the target value, wherein the feedback control uses the electric current and rotational speed collected during the feedback control.
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Accused Products
Abstract
A method of constant airflow control includes various controls to accomplish a substantially constant airflow rate over a significant change of the static pressure in a ventilation duct. One control is a constant I·RPM control, which is primarily used in a low static pressure range. Another control is a constant RPM control, which is primarily used in a high static pressure range. These controls requires neither a static pressure sensor nor an airflow rate sensor to accomplish substantially constant airflow rate while static pressure changes. Also, the method improves the accuracy of the control by correcting certain deviations that are caused by the motor'"'"'s current-RPM characteristics. To compensate the deviation, the method adopts a test operation in a minimum static pressure condition. Also disclosed is an apparatus for conducting these control methods.
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Citations
21 Claims
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1. A method of controlling an electric motor for use in a ventilation system, the method comprising:
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providing a ventilation system comprising a blower and a duct with at least one opening, the blower comprising a motor and a fan coupled to the motor, the blower being configured to generate an airflow through the at least one opening; conducting a test operation of the blower for collecting data indicative of the motor'"'"'s operation in the ventilation system; processing the data collected from the test operation to generate a correction coefficient; and conducting a feedback control using a target value, which has been modified using the correction coefficient, wherein the feedback control comprises a constant I·
RPM control to maintain a product of an electric current (I) and a rotational speed (RPM) within proximity of the target value, wherein the feedback control uses the electric current and rotational speed collected during the feedback control. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification