Electricity: motor control systems – Open loop speed control system for dc motor with commutator – Analog armature control
Patent
1988-03-23
1989-08-08
Ro, Bentsu
Electricity: motor control systems
Open loop speed control system for dc motor with commutator
Analog armature control
388934, 318599, H02P 729
Patent
active
048560782
ABSTRACT:
A simple pulse width modulator speed control for a brushless DC "pancake" type fan motor utilizes a type 555 timer for driving a transistor switch, connected in series between the DC voltage supply and the fan motor, at about a 10 Hz rate. The duty cycle of the pulsed output of the timer is controllable by a variable resistor, which in the preferred embodiment comprises a thermistor for controlling the fan speed as a function of temperature. The fan motor is restarted on each cycle of full voltage amplitude pulses and consequently will start under all operating conditions.
REFERENCES:
patent: 3260912 (1966-07-01), Gregory
patent: 4015182 (1977-03-01), Erdman
patent: 4105938 (1978-08-01), Mathews
patent: 4129808 (1978-12-01), Bregeault et al.
patent: 4216418 (1980-08-01), Wagensonner et al.
patent: 4291259 (1981-09-01), Marumoto et al.
patent: 4325011 (1982-04-01), Peterson
patent: 4347468 (1982-08-01), Wilke
patent: 4356438 (1982-10-01), Iwasaki
patent: 4458183 (1984-07-01), Neilson
patent: 4459087 (1984-07-01), Barge
patent: 4506199 (1985-03-01), Asche
patent: 4553075 (1985-11-01), Brown et al.
patent: 4618806 (1986-10-01), Grouse
patent: 4638223 (1987-01-01), Tajima et al.
patent: 4656553 (1987-04-01), Brown
patent: 4659290 (1987-04-01), Kundert
patent: 4700116 (1987-10-01), Inoue et al.
patent: 4722669 (1988-02-01), Kundert
"Self-Contained Speed Controller Allows DC Fans to Idle at One-Half Rated Speed", Control Resources Inc., Smart Fan Div, Box 315, Harvard, MA 01451, phone (617)456-8763.
Ro Bentsu
Zenith Electronics Corporation
LandOfFree
DC fan speed control does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with DC fan speed control, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and DC fan speed control will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-912209