Electricity: motive power systems – Motor-reversing – Armature or primary circuit control
Reexamination Certificate
1999-05-28
2001-11-13
Dang, Khanh (Department: 2837)
Electricity: motive power systems
Motor-reversing
Armature or primary circuit control
C388S907200
Reexamination Certificate
active
06316892
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates generally to automatic door control systems for moveable doors and more particularly to the use of pulse width modulation for controlling the door motor.
Typical automatic door control systems require a means for sensing the position of the door. This position sensing is used for controlling the various stages of operation of the door and for monitoring the door for abnormal operation, such as an obstructed door. Position monitoring devices are used such as limit switches, which are useful for monitoring specific positions of the door, but do not monitor for non-movement indicating that the door is obstructed.
Some prior art automatic door control systems use multitap autotransformers (with multiple fixed speeds) for motor speed control. This can cause the door to jerk when changing speeds.
The foregoing illustrates limitations known to exist in present automatic door control systems. Thus, it is apparent that it would be advantageous to provide an alternative directed to overcoming one or more of the limitations set forth above. Accordingly, a suitable alternative is provided including features more fully disclosed hereinafter.
SUMMARY OF THE INVENTION
In one aspect of the present invention, this is accomplished by providing a automatic door control system for use with a moveable door system wherein at least one door is moved between closed and opened positions by means of the rotary drive of an electric motor, the automatic door control system comprising: a bi-directional multi-speed rotary drive motor operably connected to the at least one door; motor drive controller including: a microcontroller having a pulse width modulation capability; and four transistors in an H-Bridge configuration.
The foregoing and other aspects will become apparent from the following detailed description of the invention when considered in conjunction with the accompanying drawing figures.
REFERENCES:
patent: 4454454 (1984-06-01), Valentine
patent: 4563625 (1986-01-01), Kornbrekke et al.
patent: 4952080 (1990-08-01), Boiucaner et al.
patent: 4999551 (1991-03-01), Yoshida et al.
patent: 5218282 (1993-06-01), Duhame
patent: 5625266 (1997-04-01), Stark
Dang Khanh
Michael & Best & Friedrich LLP
NT Dor-O-Matic Inc.
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