Electricity: motive power systems – Battery-fed motor systems
Patent
1978-08-07
1979-06-12
Smith, Jr., David
Electricity: motive power systems
Battery-fed motor systems
318342, H02P 706
Patent
active
041581580
ABSTRACT:
A D.C. series motor for mining and other equipment is powered by batteries which are connected in parallel for low voltage acceleration and in series for high voltage normal running speed. The motor controller includes a relay switch for connecting the batteries in series circuit without opening the parallel battery connections, and uni-directional conductors which prevent short circuiting in the parallel battery circuit legs when the series connection is completed. Forward and reverse circuits for reversing current flow through the motor armature each include normally open relay contacts on opposite sides of the armature. The motor is energized by actuation of a foot controlled sequential switch which first energizes a normally neutral position directional switch and directs current to either a forward direction relay or to a reverse direction relay depending upon the selection of the operator. Energization of the forward or reverse relays closes the relay contacts in the forward or reverse motor circuit respectively. The motor is then energized by the batteries connected in parallel. Further depression of the foot switch energizes a time delay circuit including a relay which is energized after a time delay to connect the batteries in series and thus to supply high voltage to the motor for normal running speed. The time delay circuit includes a pair of parallel connected time delay switches, each having its energizing element in a different one of the forward and reverse relay circuits. One of the time delay switches thus begins timing as soon as one of the forward and reverse relay circuits is energized.
REFERENCES:
patent: 3219137 (1965-11-01), Appleton
patent: 3809978 (1974-05-01), Zubris
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