Quotables
"To place a man in a multi-stage rocket and project him into the controlling gravitational field of the moon where the passengers can make scientific observations, perhaps land alive, and then return to earth--all that constitutes a wild dream worthy of Jules Verne. I am bold enough to say that such a man-made voyage will never occur regardless of all future advances."
Lee deForest, American radio pioneer ; 1957
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| Number | Title | Issue Date |
| 7683557 | Interlocking device for controlling clockwise and counterclockwise rotation of a motor An interlocking device for controlling clockwise and counterclockwise rotation of a motor is connected with a clockwise rotation module and a counterclockwise rotation module at both ends thereof to form a loop by cooperating with a power-supply terminal and an eart... | 03/23/2010 |
| 7358696 | Method and apparatus for PWM drive During PWM control in which an actuator (9) is connected between the output terminals of a bridge circuit made up of switching elements (121, 122, 221, 222) and power is applied to the actuator (9) with signals G1U, G1L, G2U... | 04/15/2008 |
| 6989643 | Electrical drive apparatus which can be operated via a full-bridge circuit, with a different load depending on the drive direction An electrical drive apparatus, in particular, a motor-driven motor vehicle window winder or motor vehicle belt roller, which can be operated via a full bridge circuit with at least four switching elements with a different load depending on the rotation direction, wh... | 01/24/2006 |
| 6417636 | Power window device In a power window device, a DOWN switch has first and second switches in a power window circuit located in a door for a window of a passenger's seat. A normally-closed contact of the first switch and a remote UP terminal of the power window circuit to whi... | 07/09/2002 |
| 5914576 | Locking devices and control circuitry for permanent magnet electric motors A positive locking device is provided in order to prevent a motor from rotating after power has been removed. The positive locking device has a plate mounted on the motor which engages a disk or hub on the shaft of the motor. In another aspect of the inve... | 06/22/1999 |
| 5717301 | Electric motor assembly An electric motor having a permanent magnet rotor and a stable with two poles and two windings and electronic switching for controlling commutation. To ensure that the motor starts under heavy load conditions, commutation is delayed during a predetermined... | 02/10/1998 |
| 5600216 | Bridge circuit for driving a brushless DC motor The invention pertains to a bridge circuit and a drive circuit for it, in particular for driving a brushless DC motor. The bridge circuit exclusively consists of n-channel field-effect transistors. An auxiliary potential generated by at least one potentia... | 02/04/1997 |
| 5574344 | Power steering apparatus for performing feedback control of motor-driving current A power steering apparatus for use in association with an electric motor, includes a switch circuit driven by a PWM wave signal which switches between one polarity and the other of the voltage developed across a motor-driving current detecting resistance ... | 11/12/1996 |
| 5574343 | Control of activators in motor vehicle doors A system for controlling actuating members in the doors of motor vehicles has at least one electromotive actuating drive and at least one actuating element (switch, button) in the door of the motor vehicle, as well as a control unit located in the vehicle... | 11/12/1996 |
| 5495155 | Device in a power delivery circuit An improved current sensing circuit is provided in, or for use with, a power delivery circuit having a current controlling device of the type which includes auxiliary current sensing terminals. The current sensing circuit is particularly useful in conjunc... | 02/27/1996 |
| 5389861 | Machine tool power speed changer A retrofit power accessory for a turret mill provides a motor drive for changing machine tool speed, replacing a handwheel. A frame is attached to the mill by a pair of adjustable brackets which accommodate various models of mills. The frame carries a spi... | 02/14/1995 |
| 5260632 | Position control system A positioning control for linearly displacing an object (31) has a direct current motor (1) and a gear (2,21) for converting rotary into linear motion, a current supply (4) of current pulses having given frequency, amplitude and duration; a pole reverser;... | 11/09/1993 |
| 5210475 | Current sensing circuit for use with a current controlling device in a power delivery circuit An improved current sensing circuit is provided in, or for use with, a power delivery circuit having a current controlling device of the type which includes auxiliary current sensing terminals. The current sensing circuit is particularly useful in conjunc... | 05/11/1993 |
| 5032774 | Current sensing circuit for use with a current controlling device in a power delivery circuit An improved current sensing circuit is provided in, or for use with, a power delivery circuit having a current controlling device of the type which includes auxiliary current sensing terminals. The current sensing circuit is particularly useful in conjunc... | 07/16/1991 |
| 4739229 | Apparatus for utilizing an a.c. power supply to bidirectionally drive a d.c. motor Apparatus for using an a.c. power supply to bidirectionally drive a d.c. motor includes a first silicon controlled rectifier (SCR) having a cathode connected to a terminal of the motor and an anode connected to a circuit common junction. A second SCR has ... | 04/19/1988 |
| 4654568 | MOSFET "H" switch with current sensing Current sensing of current through an "H" switch circuit is accomplished without the use of a dropping resistor. The current sensing is provided by using current sensing field effect transistors in conjunction with power field transistors.... | 03/31/1987 |
| 4649326 | High voltage MOS SCR and power MOSFET "H" switch circuit for a DC motor An MOS SCR and MOSFET "H" switch circuit for a DC motor is provided which allows for the use of a supply voltage of greater than 20 volts by clamping the gate-to-cathode voltage of the SCR's used therein to a predetermined value which is less than the gat... | 03/10/1987 |
| 4628232 | Anti-plug reversing module An anti-plug reversing circuit for use with a variable speed D.C. motor which provides safe and fast motor reversing with dynamic braking. The circuit, by sensing counter-EMF, prevents the premature application of a voltage of opposite (reversing) polarit... | 12/09/1986 |
| 4496888 | Control system for a d.c. motor A d.c. motor control system, intended primarily for use in battery powered vehicles, includes a control switch (RL2a, RL2b) for varying the connections of the motor field winding (24) to determine the mode of operation of the motor and speed interlock mea... | 01/29/1985 |
| 4490655 | Bi-directional driver system for electrical load A bi-directional driver system for an electrical load operable in response to two independent logic command signals provides a means for selecting the direction of current flow in the load when driven by the external command. A bridge circuit employs inpu... | 12/25/1984 |
| 4394605 | Load drive control system A load drive control system for use with an automobile one-touch window glass or sunroof opening and closing system or antenna vertical movement control system includes a signal holding switching circuit responsive to an instruction signal for driving a r... | 07/19/1983 |
| 4284935 | Vehicle power seat adjuster control system A vehicle power seat adjuster control system that provides for the pulsed reversal of rotation of the armature of the operating motor of a vehicle power seat adjuster mechanism each time the operating motor is deenergized at the conclusion of each seat ad... | 08/18/1981 |
| 4234834 | D.C. Motor directional control A D.C. motor directional control in which relays switch the polarity of the D.C. voltage applied to the motor armature in order to obtain forward or reverse operation of the D.C. motor. A SCR is connected in the armature circuit to control the current of ... | 11/18/1980 |
