Electricity: motive power systems – Braking – Automatic and/or with time-delay means
Patent
1984-10-03
1987-02-17
Shoop, Jr., William M.
Electricity: motive power systems
Braking
Automatic and/or with time-delay means
318434, 318427, 318473, 307 87, 307 64, 361 23, 361 24, H02P 300
Patent
active
046442383
ABSTRACT:
An apparatus for controlling an airflow to a boiler or the like and maintaining a desired quantity thereof. The apparatus comprises a controller for generating a control signal of a level corresponding to a required airflow, a variable-frequency power supply for producing an output of a frequency corresponding to the control signal level so as to drive a ventilation-actuating motor, and means for detecting any deviation of the control signal level from a predetermined range and retaining the frequency of the motor-driving output at a proper value, whereby the airflow is maintained at or above a preset value.
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Ip Shik Luen Paul
Mitsubishi Denki & Kabushiki Kaisha
Shoop Jr. William M.
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