Celebrity Inventors
Glam girl Heddy Lamar may have used her good looks to good effect on the silver screen, but she put her smarts to better use as an inventor. During World War II, she co-patented a frequency-switching system for torpedo guidance that was considered years ahead of its time.
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| Number | Title | Issue Date |
| 7348754 | Motion control using electromagnetic forces An apparatus has (a) a first component having one or more electromagnetic elements and (b) a second component having one or more electromagnetic elements and movably coupled to the first component. The second component moves with respect to the first component in a ... | 03/25/2008 |
| 7262570 | Motor controller with enhanced noise immunity unbuffered hall sensors A method and apparatus of interfacing a Hall sensor to a commutation circuit comprises receiving output signals from the Hall sensor; detecting when the Hall sensor output signals are within a predetermined range; generating commutation output signals when the Hall ... | 08/28/2007 |
| 7132808 | Solid state series motor control A solid state series motor control includes first and second FORWARD DRIVE elements, first and second REVERSE DRIVE elements, first and second diodes, a current sensor, and a capacitance. The series motor control is conf... | 11/07/2006 |
| 7129657 | Single track brush-based position encoder for rotating shaft A position sensor generates a signal representative of the angular position and, if desired, angular velocity of a rotating object using only a single circular track and plural brushes that ride on the track when the object rotates. The single circular track can hav... | 10/31/2006 |
| 7126299 | Enhanced system and method for controlling discharge of electric energy from machines Certain exemplary embodiments can comprise a method comprising: receiving electrical energy from a braking system of a vehicle at a working coil, the vehicle comprising a first wheel drive comprising a first electric motor; and via the working coil, transferring the... | 10/24/2006 |
| 7106013 | Motor drive apparatus driving 3-phase brushless motor without using hall sensor A motor drive apparatus includes a comparison circuit comparing voltages of 3-phase coil terminals and the voltage of a neutral point terminal of a 3-phase brushless motor to determine which voltage is higher/lower, a zero ampere current detection circuit detecting,... | 09/12/2006 |
| 7106016 | Inductive heating system and method for controlling discharge of electric energy from machines Certain exemplary embodiments can comprise a method comprising: receiving electrical energy from a braking system of a vehicle at a working coil, the vehicle comprising a first wheel drive comprising a first electric motor; and via the working coil, transferring the... | 09/12/2006 |
| 7071645 | Braking device for an electric motor, electrical apparatus provided with the braking device, and a method of braking A braking device for an electric motor of a power tool has a short circuit switch for short circuiting an armature winding of the electric motor during a braking process, the short circuit switch for controlling its switch condition having a control input, a control... | 07/04/2006 |
| 7064509 | Apparatus for DC motor position detection with capacitive ripple current extraction An apparatus for determining angular positions of DC motor includes a capacitor connected in parallel with the DC motor. The current flowing through the capacitor, at any given time, is an AC ripple current responsive to a commutation event of the DC motor. The capa... | 06/20/2006 |
| 6943510 | Excitation circuit and control method for flux switching motor An excitation circuit for a flux switching motor. The circuit includes a low-value film capacitor across the DC side of a bridge rectifier. A plurality of electronic switches are arranged in an H-bridge configuration for switching current flow through an armature wi... | 09/13/2005 |
| 6741047 | Dual current-limiting circuit for DC brushless motor A dual current-limiting circuit for a dc brushless motor includes an over-current detective circuit, an operation detective circuit, and a current-limiting circuit. The over-current detective circuit produces a voltage signal used to determine whether an over-curren... | 05/25/2004 |
| 6690128 | Drive system for domestic appliances A drive system for a domestic appliance provides inner and outer coaxial drive outlets operative at different speeds and comprises an active limb, which incorporates an electric drive motor and a shaft driven by said motor and coupled to the inner drive o... | 02/10/2004 |
| 6664750 | D.C. motor bridge coil driver An H-type motor bridge coil driver circuit is implemented with an electronic switch in each leg segment of an H-shaped circuit, this bridge circuit having its side legs each connected between a power supply and ground, with the inductive load of a motor c... | 12/16/2003 |
| 6396228 | Motor operator for a circuit breaker In the three-terminal motor operator of the present invention, current flowing through half coil causes the rotor to rotate in a first direction, and current flowing through half coil causes the rotor to rotate in a second direction. Rotation of the rotor... | 05/28/2002 |
| 6353297 | Series motor A series motor with commutator is disclosed which is especially suited as universal motor for a braked power tool. The series motor comprises a switch for switching between a motor mode and a braking mode, wherein, in motor mode, at least one field windin... | 03/05/2002 |
| 6236173 | Series wound motor A series wound commutator motor is disclosed which is particularly suited for an inverse-speed electric tool. A switch is provided for switching between a motor operation mode and a braking operation mode, wherein in motor operation at least one field coi... | 05/22/2001 |
| 6121788 | Method and fixture for evaluating stator core quality in production A fixture to evaluate stator production quality is placed about a stator core so as to introduce a test winding about the stator without need for hand winding. The fixture includes an inner annulus and an outer annulus each with axial conductors thereon, ... | 09/19/2000 |
| 6078152 | Bidirectional E.C. motor and method of operating the motor In a method of starting a two-pulse electronically commutated dc motor, which is designed for operation in a preferred direction, for purposes of startup in a desired direction, the following steps are carried out: after start-up, the rotor of the motor i... | 06/20/2000 |
| 6064162 | Circuit for automatic operation of a series brake upon power loss during a regenerative braking period An anti-regeneration circuit for preventing a regenerated current produced by an overhauling DC motor from setting a series brake. The anti-regeneration circuit includes a current blocking device 90 which blocks the flow of regenerated current in the cran... | 05/16/2000 |
| 6013993 | Braking circuit for a universal motor A braking circuit for a universal motor is proposed, in which, during braking, the at least one field winding is connected in series with the armature by means of a semi-conductor switch, preferably a field effect transistor or a thyristor. Since the semi... | 01/11/2000 |
| 5994860 | Series wound motor with electrical brake In a series-wound motor with electric brake, which comprises an armature provided with an armature winding and at least two exciter coils mounted on pole shoes as well as switchgear which, in the operative phase of the motor, serially connect the exciter ... | 11/30/1999 |
| 5869938 | Current control apparatus in DC motor Current control apparatus of DC motor includes current amplifying means for detecting the current amount at the rear end of the motor and amplifying the current value; on-off control means for comparing the input current with the current supplied from the... | 02/09/1999 |
| 5811945 | Traveling gear with oscillation damping A travel drive for a trolley traveling gear of hoists has a drive train which has the properties of a freewheel as regards the direction of travel. Consequently load oscillation can be rapidly damped out because the speed of the traveling gear is not forc... | 09/22/1998 |
| 5708333 | Series-wound motor with a braking element A series-wound motor, wherein, for braking purposes, the polarity of the armature of the motor is reversed for the opposite direction of rotation. The current supply for the motor is maintained until the armature comes substantially to a standstill and su... | 01/13/1998 |
| 5577153 | High frequency control circuit for DC motors, particularly for washing machines A control circuit for a series type dc motor. The control circuit uses a switching cell to control motor speed. The switching cell and motor receive power from a filtered dc supply. A tachometer generator produces a voltage proportional to motor speed. Th... | 11/19/1996 |
| 5453673 | DC motor with auxiliary exciting power supply for switching-on series (or compound) start of shunt normal operation according to the load A motor control circuit includes a series motor made up of a series field winding serially connected with an armature or a compound motor having both a series field winding and a shunt field winding. The series field winding is parallel connected to an au... | 09/26/1995 |
| 5311108 | Control system for unidirectional motor having improved dynamic braking Motor control system for unidirectional series DC electric motor having improved dynamic braking performance for smoothly, rapidly and predictably stopping the motor armature so that any operated devices are similarly stopped at a predetermined location. ... | 05/10/1994 |
| 4730149 | Circuit arrangement for regulating the rpm of a series motor A circuit arrangement for regulating the rpm of an electric motor having series connected field and armature windings 1, 4 comprises a controllable rectifier 5 which is connected in series with the motor and is controlled by a phase control unit 30 as a f... | 03/08/1988 |
| 4639647 | Four quadrant control of series motors A method of controlling and a controller for controlling at least one series motor is provided. Rectifier means is connected in series with the motor so that current through a field winding of the motor is always in the same direction irrespective of the ... | 01/27/1987 |
| 4638226 | Speed control system with feedback and soft-start A motor (M) supplied by AC full-wave voltage is controlled by a triac (Q2) under the control of a double-time constant triggering circuit which has a speed setting branch (R3-C2) connected at the triac (Q2) side of the motor (M) and the other time constan... | 01/20/1987 |
| 4442385 | Variable frequency drive for a motor-generator/alternator set A variable frequency drive for a motor-generator/alternator set which is used to supply electrical power to computer or data processing equipment. Power failures in commercially supplied power results in aberrations and erroneous computations in computers... | 04/10/1984 |
| 4409528 | Motor speed control circuit providing armature current sensing and feedback action for each half cycle and control circuit reducing energy consumption of induction motors when running under no load and light loading A motor speed control circuit in which a source of alternating current (AC), a universal-type motor, a triac and a large capacitor are connected in series, with the armature current flowing through the large capacitor and with the control providing armatu... | 10/11/1983 |
| 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 |
| 4181876 | Speed control circuit for electric motors The speed control circuit comprises a full wave rectifier having its output connected to an adjustable D.C. voltage divider. A series circuit connected to an A.C. power source includes an electric motor and an anti-parallel connection of two thyristors. T... | 01/01/1980 |
| 4002961 | Electronic switch for controlling the speed of a motor An electronic switch for variably controlling the speed of an electric motor, comprising a stationary member, a trigger member, clip means for securing said trigger member slidably relative to said stationary member, a pair of electric cords extending fro... | 01/11/1977 |
| 3980936 | D.C. control circuits A d.c. control circuit includes a slew-rate limiting circuit interposed between a current sensing device which detects current in a load and a control circuit, for switching on and off a thyristor controlling current through the load. The circuit limits t... | 09/14/1976 |
