Electricity: motor control systems – Open loop speed control system for dc motor with commutator – Analog armature control
Patent
1998-01-15
2000-02-01
Martin, David
Electricity: motor control systems
Open loop speed control system for dc motor with commutator
Analog armature control
388827, H02P 602, H02P 700
Patent
active
060212527
ABSTRACT:
An arrangement is disclosed for controlling fan motors in fan-powered terminal units which permit the air flow of the terminal units to be factory preset and reset using a voltmeter. The fan motor is responsive to the pulse width of pulses of a pulse width modulated signal to provide an air flow which is proportional to the pulse width. By adjusting the pulse width, the air flow may be set as desired. A pulse width modulated signal having pulses with a set amplitude and frequency is generated. The dc voltage of the pulse width modulated signal is measured using a voltmeter. As the pulses have a set amplitude and frequency, the pulse width of the pulses may be adjusted by controlling the dc voltage of the pulse width modulated signal. The fan motor is programmed to deliver the set air flow over a range of static pressures.
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Crowe Robert Clayton
Faris Eugene William Michael
Martin David
Nailor Industries of Texas Inc.
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