| 摘要 |
This invention deals with a barrier operator system comprising a direct current (dc) motor coupled to a barrier, where the dc motor is driven by a string of voltage pulses. The system has a barrier operator that is programmed to determine various qualities including the speed of the motor from a generated voltage and a position of the barrier using the speed. Further, the barrier operator has the capability to adjust the speed of the motor based upon the determined position of the barrier using the speed.
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