Control apparatus of DC motors
AssigneeAgency of Industrial Science and Technology
InventorsSusumu Tadakuma, Junpei Inagaki, Shigeru Tanaka
Life of this patent
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Abstract
In apparatus for controlling the speed of a DC motor by the ON-OFF control of a switching transistor, a pair of switching transistors are connected in series with the motor and the switching transistors controlled such that while one of them is rendered ON the other is rendered from ON to OFF and sequentially from OFF to ON.
Claims8
In control apparatus for a DC motor of the type wherein the power supplied to said motor from a direct current source of supply is controlled by the ON-OFF control of switch means, the improvement which comprises first and second switch means which are connected in series between said source and said motor, a first rectifier connected in parallel with a first series connection including said source and said first switch means, a second rectifier connected in parallel with a second series connection including said source and said second switch means, a smoothing reactor connected between said first switch means and said motor, and control means supplying said first and second switch means with control signals such that while one of said switch means is rendered ON the other switch means is rendered from ON to OFF and sequentially from OFF to ON.
In a control apparatus for a DC motor of the type wherein the power supplied to said motor from a direct current source is controlled by an ON-OFF switch control, the improvement which comprises first and second switch means which are connected in series between said source and said motor, and control means supplying said first and second switch means with control signals such that while one of said switch means is rendered ON the other switch means is rendered from ON to OFF and subsequently from OFF to ON, said control means comprising a source of a pulse of a predetermined frequency, a flip-flop circuit responsive to said pulse for producing output pulses of opposite phase, said output pulses having a frequency one half of said first mentioned pulse, and a plurality of OR gate circuits and AND gate circuits responsive to said first mentioned pulse and said output pulses for producing control signals for performing ON-OFF control of said switch means.
Dependencies are inferred from the claim text.