Electricity: motive power systems – Plural – diverse or diversely controlled electric motors – Mechanically coupled in fixed ratio of movement
Patent
1974-06-10
1976-04-20
Schaefer, Robert K.
Electricity: motive power systems
Plural, diverse or diversely controlled electric motors
Mechanically coupled in fixed ratio of movement
H02P 768
Patent
active
039522350
ABSTRACT:
There is disclosed an electric system for controlling the direction of rotation of two counter rotating motors operated from a source of A.C. line voltage, the system comprising a selecting circuit operated by a rectifier connected to the source and containing two junctions, a first of which is at a D.C. voltage V when the second is at zero voltage and vice versa. A reset switch operated mechanically by rotation of the motors puts the voltage V alternately at the first junction and the second junction. When the voltage V is at the first junction it produces a pulse in a first control path which controls the first of the motors and when it is on the second junction it puts a pulse on the second path for operating the second motor. Each control path comprises a latch circuit operated by the pulse, a time delay circuit and a motor control circuit including a power switch operable at the end of the time period to torque the respective motor. The two motors are on a shaft having a windlass on which is wound a cable attached to a load so that when the first motor turns it tensions the cable, which tension is held for a period of time after which the second motor turns to relax the cable, the relaxation being held for a period of time. This cycling continues until the power is turned off.
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Duncanson Jr. W. E.
Mon Donald D.
Schaefer Robert K.
Tru-Eze Manufacturing Co., Inc.
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