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US 4,233,548 AGranted
Variable speed electronic motor
AssigneeMassachusetts Institute of Technology
InventorJames L. Kirtley, Jr.
Life of this patent
Estimating the term…
Abstract
A variable speed electronic motor which may be powered by an ac or dc source and wherein both the speed of the motor and the input power thereto are controlled and related to one another.
Claims23
A variable speed electronic motor for connection to a power source that comprises, in combination:
- a rotor;
- an armature winding;
- semiconductor switching means to connect between the power source and the armature winding, the semiconductor switching means comprising semiconductor switches connected in pairs in which one semiconductor switch of each pair is operable to carry current to the winding and the other semiconductor switch of each pair is operable to carry current from the winding;
- position control module means to provide a position control signal;
- voltage control module means to provide a voltage control signal;
- and control means connected to control the semiconductor switching means, said control means comprising an electrical gating module connected to control each semiconductor switch of each pair, each gating module including a logic gate and signal transfer means connected to transfer control information to the associated semiconductor switch from the logic gate, the logic gate being connected to receive the position control signal and the voltage control signal and being operable to combine the two signals to form a composite signal output that is fed as a control signal to said associated semiconductor switch to control the speed of the motor and the amount of electric energy transferred thereto said logic gate being a gate that provides said composite signal output only when both the position control signal and the voltage control signal are present as inputs to the logic gate.
3 more elements
A variable speed electronic motor for connection to a power source that comprises, in combination:
- a rotor;
- an armature winding;
- semiconductor switching means for connection between the power source and the armature winding, the semiconductor switching means comprising semiconductor switches connected in pairs in which one semiconductor switch of each pair is operable to carry current to the winding and the other semiconductor switch of each pair is operable to carry current from the winding;
- position control module means to provide a position control signal;
- voltage control module means to provide a voltage control signal;
- and control means connected to control the semiconductor switching means, said control means comprising an electrically operated gating module connected to control each semiconductor switch of each pair and including logic gate means connected to transfer control information to the associated semiconductor switch, said logic gate means being connected to receive the position control signal and the voltage control signal and being operable to combine the two signals to form a composite signal output that is fed as a control signal to said associated semiconductor switch to control the speed of the motor and the amount of electric energy transferred thereto, said logic gate means being operable to provide said composite signal output only when both the position control signal and the voltage control signal are present as inputs to the logic gate means.
3 more elements
Dependencies are inferred from the claim text.