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US 4,789,815 AGranted
Linear motor
AssigneeOhi Seisakusho Co., Ltd.
InventorsFumio Kobayashi, Kunio Sakai, Jun Yamagashi
Life of this patent
Estimating the term…
Abstract
A linear motor comprises a rail; a runner moved along the rail; a plurality of permanent magnets disposed in the rail along the longitudinal direction of the rail so as to alternately arrange the opposite polarities of the permanent magnets; coils disposed in the runner and arranged to oppose the permanent magnets; Hall elements disposed in the coils; and a control unit disposed in the runner and controlling an electric current supplied to the coils based on signals output from the Hall elements.
Claims5
A linear motor comprising:
- a rail;
- runner means for moving along the rail;
- a plurality of permanent magnets disposed longitudinally in the rail so as to alternately arrange the opposite polarities of the permanent magnets;
- coil means disposed in the runner means and arranged for opposing said permanent magnets;
- Hall elements disposed in the runner means;
- control means disposed in the runner means and controlling an electric current supplied to the coil means based on signals output from the Hall elements;
- said coil means comprising a pair of coils, said Hall elements outputting signals for providing for the coils with polarities opposite the polarities of the permanent magnets adjacent the coils, and said control means comprising a control circuit for switching electric current supplied to the coils based on the signals from the Hall elements;
- and
- said control means further comprising exclusive NOR gates inputting the signals from the Hall elements and outputting signals for switching the electric current supplied to the coils to said control circuit.
6 more elements
A linear motor comprising:
- a rail;
- runner means for moving along the rail means;
- a plurality of permanent magnets disposed in the rail along the longitudinal direction of the rail so as to alternately arrange the opposite polarities of the permanent magnets;
- coil means disposed in the runner means and arranged for opposing said permanent magnets;
- Hall elements disposed in the runner means;
- terminal means disposed in the runner means for supplying an electric current to the coil means;
- and
- control means disposed in the runner means for controlling electric current supplied through the terminal means to the coil means based on signals output from the Hall elements.
5 more elements
Dependencies are inferred from the claim text.