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...When G.G. Hubbard learned of his future son-in-law's invention, he called it "only a toy." His daughter was engaged to a young man named Alexander Graham Bell.
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| Number | Title | Issue Date |
| 7365504 | Motor having multiple independent armature winding sets A motor is provided that includes multiple sets of independent stator windings that are not magnetically coupled, which allows the motor to be driven by multiple independent current drivers, and thereby increases the overall torque generated by the motor. In one emb... | 04/29/2008 |
| 7250702 | Rotary electric machine comprising a stator and two rotors The invention relates to an electric machine comprising a stator (10, 40) provided with a plurality of teeth (11, 41), each tooth supporting at lest one individual coil (13, 46, 47), an external rotor (30) which is radially arranged outsi... | 07/31/2007 |
| RE39205 | Power output apparatus and method of controlling the same While a ring gear shaft 126 linked with a drive shaft rotates, a power output apparatus 110 applies a torque to a first motor MG1 attached to a sun gear shaft 125, thereby abruptly increasing a revolving speed of an engine 150, to ... | 07/25/2006 |
| 6960897 | Apparatus and method for protecting starter for engine against overheating A method and an apparatus for protecting an engine starter of a motor vehicle against overheating with enhanced reliability by controlling turn-on/off of the starter in dependence on a conducting current of the starter, a starter temperature and an ambient temperatu... | 11/01/2005 |
| 6922885 | High temperature superconducting racetrack coil A racetrack shaped high temperature superconducting (HTS) coil is fabricated by layer winding HTS tape under tension on a precision coil form with a binder such as pre-preg filament-ply interlayer insulation. The coil form includes a racetrack shaped bobbin, two sid... | 08/02/2005 |
| 6888329 | Control method of dynamo-electric machine for vehicle A method of controlling an electric rotating machine for a vehicle includes an electric rotating machine (1) including a rotator having a field winding (5) and a stator having an armature winding (3), a field current controller (9) for co... | 05/03/2005 |
| 6879125 | Control apparatus and method for at least one electrical rotating machine using compound current In control apparatus and method for at least one electrical rotating machine, two rotors are disposed in the electrical rotating machine on the same axis of rotation and being driven independently of each other by means of a generated compound current and are associ... | 04/12/2005 |
| 6844699 | Current detection device A current detection device used for a plurality of rotating electric machines is provided. The rotating electric machines are supplied with a composite current containing a plurality of frequency components from an single inverter and the frequency is set in respons... | 01/18/2005 |
| 6774591 | Motor/generator A motor/generator comprises a stator (2) having plural coils (C1-C14), and plural rotors (3, 4) disposed coaxially with the above-mentioned stator and driven by a compound current. The phase difference between the currents (70, 71)... | 08/10/2004 |
| 6420842 | Exciter and electronic regulator for rotating machinery An exciter assembly for supplying power to a superconducting load, such as a superconducting field coil, disposed within a cryogenic region of a rotating machine. The exciter assembly provides an efficient and reliable approach for transferring the electr... | 07/16/2002 |
| 6081082 | Rotatable inverter Disclosed is a rotatable inverter. The rotatable inverter comprises a rotatable inverting means for inverting a DC power source to an AC power source by means of a rotational force, and a transformer which receives the AC power source inverted by the rota... | 06/27/2000 |
| 6043567 | Vehicle electrical system A new vehicle electrical system has a first lower voltage level and a second higher voltage level. The new vehicle electrical system comprises an ignition switch, a generator having an exciter circuit and a voltage controller, and a multi-chopper having s... | 03/28/2000 |
| 5994811 | Electric motor An electric motor comprising two separate and coaxially spaced armatures as well as a magnet-equipped rotor arranged between the two armatures. One armature is fixed to a motor housing being a static armature, while the other armature is free to rotate, h... | 11/30/1999 |
| 5929610 | Method and apparatus for shoot-through detection and accommodation in an electric power system including a synchronous generator power source A shoot-through protection system for an electric power generating system including a synchronous generator, a bridge rectifier coupled to an output of the generator for converting alternating current (AC) from the generator to direct current (DC) at a re... | 07/27/1999 |
| 5914575 | Power output apparatus and method of controlling the same While a ring gear shaft 126 linked with a drive shaft rotates, a power output apparatus 110 applies a torque to a first motor MG1 attached to a sun gear shaft 125, thereby abruptly increasing a revolving speed of an engine 150, to which a fuel injection i... | 06/22/1999 |
| 5814958 | Method and apparatus for the electronic control of electric motor driven golf car A system is provided for controlling a DC motor which is constructed to propel a golf car. The motor is a shunt wound motor having independently excited armature and field windings. The basic input to the armature of the motor is supplied through a pulse ... | 09/29/1998 |
| 5793175 | Performance event sensing for control of electric motor driven golf car A system is provided for controlling a D-C motor which is constructed to propel a golf car. The motor is controlled to provide performance according to a predetermined field current map which calls for a particular performance response to specified perfor... | 08/11/1998 |
| 5642023 | Method and apparatus for the electronic control of electric motor driven golf car A system is provided for controlling a DC motor which is constructed to propel a golf car. The motor is a shunt wound motor having independently excited armature and field windings. The basic input to the armature of the motor is supplied through a pulse ... | 06/24/1997 |
| 5642021 | Method and system for controlling an alternator to optimize direct current output A method and system for maximizing the output of an alternator in an automotive vehicle. An alternator is provided having a first rectifier connectable to a first output of the alternator to form a first winding configuration and a second rectifier connec... | 06/24/1997 |
| 4494050 | System for supression of underdamped oscillations in ac power drawn by synchronous motors driving Ward-Leonard generators A method and apparatus for reducing oscillations in input electrical power to a Ward-Leonard drive system which is subject to variations in mechanical loading, the technique utilizing a notch filter in the feedback path to the dc generator, the notch filt... | 01/15/1985 |
| 4348620 | Magnetic field presetting circuit for an exciter field winding in an electrical propulsion system for traction vehicles A traction vehicle propulsion system comprises a d-c motor and an excitation generator for separately exciting the motor field. Current in the field winding of the excitation generator is normally controlled by a control circuit which is arranged to preve... | 09/07/1982 |
| 4109743 | Propulsion unit for vehicles A mixed propulsion system comprising a turbine unit having two output shafts which drive two counter rotating flywheels and, via a reduction gearbox, two generators which generate electricity to drive two electric drive motors the output shafts of which a... | 08/29/1978 |
| 4061949 | Earth excavator including apparatus for stabilizing performance by compensating for changes in temperature An earth excavator including apparatus for stabilizing performance by compensating for changes in temperature. The apparatus includes a temperature compensating voltage regulator for regulating and controlling the output voltage of an exciting generator a... | 12/06/1977 |
| 4045716 | Magnetic field systems employing a superconducting D.C. field coil Method and equipment for transferring energy to or from a direct-current superconducting field coil to change the magnetic field generated by the coil in which a second direct-current superconducting coil is used as a storage coil, and energy transfer bet... | 08/30/1977 |
| 3965403 | Constant power control of a D.C. electric motor for handling cargoes A crane motor control is disclosed which includes a variable D.C. voltage supply in a Ward-Leonard set which is controlled by a load torque signal obtained by sensing the armature current of a motor, magnetic flux in the motor field winding and the rate o... | 06/22/1976 |
