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| Number | Title | Issue Date |
| 6600282 | Circuit and method for preventing erroneous opening and closing in an automatically/manually foldable portable radio phone Disclosed is a circuit and method for preventing erroneous opening and closing caused particularly, by use of a DC motor in an automatically/manually foldable portable radio terminal having a main body and a sub-body rotatable with respect to the main bod... | 07/29/2003 |
| 4284933 | Control circuit for reducing field voltage in D.C. motors A circuit arrangement is disclosed for reducing field voltage peaks in direct current motors which are energized by way of an electronic D.C. regulator, and which have an exciter winding connected with the armature and commutating pole windings by means o... | 08/18/1981 |
| 4035704 | Field weakening sensor circuit Apparatus is disclosed for controlling the speed of an electric motor by selectively connecting a field weakening resistor across the field winding of an electric motor. A first means is provided for comparing the field voltage to a fixed reference voltag... | 07/12/1977 |
| 4019106 | Motor speed control A switch for speed control of an electric motor driven vehicle employs a combination of resistance switching, field weakening and voltage switching. A mechanical switch assembly has a speed switch and a voltage switch that are interconnected so that the v... | 04/19/1977 |
