Method of constant RPM control for a ventilation system
OwnerYoung-Chun Jeunginventor
Life of this patent
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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.
Claims17
A method of operating an electric motor in a ventilation system, the method comprising:
- providing a blower comprising a motor and a fan coupled to the motor, the blower being configured to generate an airflow in a ventilation duct;
- monitoring a rotational speed of the motor;
- monitoring an electric current applied to a motor;
- comparing the electric current against a reference value;
- and
- controlling the motor's operation such that the rotational speed is substantially maintained within proximity of a target rotational speed when the electric current is smaller than the reference value, and
- controlling the motor's operation such that the rotational speed stays generally inversely proportional to the electric current when the electric current is greater than the reference value.
A method of operating an electric motor in a ventilation system, the method comprising:
- providing a blower comprising a motor and a fan coupled to the motor, the blower being configured to generate an airflow in a ventilation duct;
- detecting an electric current applied to the motor;
- detecting a rotational speed of the motor;
- and
- controlling the motor's operation so as to generate the airflow with a substantially constant airflow even if a static pressure within the duct substantially changes, wherein controlling the motor's operation does not use an input of an airflow rate generated by the blower,
- controlling the motor's operation such that the rotational speed is substantially maintained within proximity of a target rotational speed when the electric current is smaller than the reference value, and
- controlling the motor's operation such that the rotational speed stays generally inversely proportional to the electric current when the electric current is greater than the reference value.
Dependencies are inferred from the claim text.