Electricity: motor control systems – Closed loop speed control system for dc motor with commutator – Armature control by digital or combined analog and digital...
Patent
1991-06-25
1994-08-23
Shoop, Jr., William M.
Electricity: motor control systems
Closed loop speed control system for dc motor with commutator
Armature control by digital or combined analog and digital...
3889281, 104300, 104DIG1, 318 4, H02P 500
Patent
active
053414535
ABSTRACT:
The specification describes a controller apparatus for a DC motor and a lamp having a filament electrically connected in parallel with the DC motor, comprising: (a) an output driver circuit for generating a DC power signal, where the DC power signal energizes the DC motor; (b) an AC signal generating circuit for generating an AC power signal; and a high frequency coupling transformer for so adding the AC power signal to the DC power signal that the AC power signal energizes the filament. Preferably, the controller also comprises: (a) a switching circuit for periodically preventing the DC power signal from controlling the DC motor; (b) a speed sensing circuit for determining a speed of the locomotive by measuring a back EMF signal generated by the DC motor during the time that the switching means prevents the DC power signal from controlling the DC motor; and (c) an error correcting circuit for correcting the DC power signal based on the speed of the locomotive.
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"Power Pack Roundup", Model Railroader, J. Hediger, Jan. 1991.
Tech and "Tech II 3" advertisement; Model Railroader, Jan. 1991.
Martin David
Shoop Jr. William M.
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