Did You Know...
...that Thomas Edison's patent application on his phonograph was approved by the Patent Office in just seven weeks? In contrast, it took Gordon Gould, the inventor of the laser, 30 years to obtain his patent -- finally awarded in 1988!
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| Number | Title | Issue Date |
| 7372232 | Apparatus for drive control, power conversion, and start-up control in a PMBDCM or two-phase SRM drive system A power converter for a switched reluctance motor (SRM) or a permanent magnet brushless direct current (do) motor (PMBDCM) may include a front-end boost partial circuit for connecting with a first phase winding of the motor to form a front-end boost circuit and a ba... | 05/13/2008 |
| 7362065 | Regenerative breaking system for electric vehicle Several embodiments of electric vehicle control and control apparatus wherein the amount of regenerative braking of the vehicle and the type of braking is determined by current conditions to provide simpler and more effective control regardless of condition of the p... | 04/22/2008 |
| 7222684 | System, apparatus, and method for providing control of a toy vehicle A system, apparatus, and method for providing a soft-start for a toy vehicle configured to be operated by a person. The method includes receiving a throttle signal operable to induce motion via a motor operating as a drive mechanism of the toy vehicle. A transition ... | 05/29/2007 |
| 7190130 | Electric motor pole position sensing method, pole position sensing apparatus, and electric motor control apparatus using the same It is an object of the invention to provide a method which can detect a magnetic pole position easily and surely by using high-frequency currents such as harmonics of an inverter output and carrier frequency components. The invention provides a method of detecting a... | 03/13/2007 |
| 7124691 | Method for monitoring and controlling locomotives The present invention is directed to a locomotive comprising energy storage units, such as batteries, a prime energy source, such as a diesel engine, and an energy conversion device, such as a generator. The locomotive comprises one or more of the following features... | 10/24/2006 |
| 7015670 | Method of controlling a high-friction electro-mechanical servo-mechanism to minimize the power needed to hold a loaded output member The invention provides a method for controlling an electromechanical servomechanism (20) for moving an output member relative to a variable load (38). The servomechanism includes: a motor (37) having at least one coil (32A, 32B or ... | 03/21/2006 |
| 6087793 | Circuit for controlling a motor with a device for recognizing an overload A circuit arrangement for cycled control of a motor, includes an overload detection device which has a signal sensing stage. Reliable detection of a motor overload is achieved, substantially without losses in the electronic system and with an economical c... | 07/11/2000 |
| 6084368 | Arrangement for the contactless inductive transmission of electric measurement values and/or electric energy between a rotor and a stator The known arrangements have at least one rotor coil (RS) arranged on the rotor and at least one stator coil (SS) arranged on the stator. The rotor coil (RS) and the stator coil (SS) respectively have at least one winding (WI) and there is a magnetic coupl... | 07/04/2000 |
| 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 |
| 6005337 | Single-ended discharge lamp The invention relates to a single-ended discharge lamp comprising a discharge tube, inleads connected to the electrodes of the discharge tube and embedded in the sealed portions thereof, a connection member connected to the inleads directly or through an ... | 12/21/1999 |
| 5942875 | Method and device for operating an asynchronous machine A method and a device for operating an asynchronous machine include controlling the rotor and the stator of the machine during start-up with respective first and second direct converter units. After the start-up the second direct converter unit is isolate... | 08/24/1999 |
| 5929582 | Direct current electrical motor system and method of using same The DC electrical motor system includes a motor having an armature DC transducer coupled to an armature current controller by a sensor/detector arrangement to control the armature current. A field DC transducer coupled to a field current controller by ano... | 07/27/1999 |
| 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 |
| 5585706 | Speed regulation of DC motor using current sensing means A system for controlling a separately excited dc motor, where control is achieved through a microprocessor-based independent PWM control of a chopper (armature) and an H-bridge (field), and where mechanical speed sensors are not used. Connected to the arm... | 12/17/1996 |
| 5576613 | DC motor-generator control circuit The present invention relates to a DC control circuit for a main motor-generator set, in which a main motor includes an auxiliary shunt field winding. The control circuit includes a current follower motor that is driven by the armature current of the main... | 11/19/1996 |
| 5572100 | Semiconductive power unit for variable speed drive motor A semiconductive power unit for controlling drive motor speed by controlling the power applied to the motor through a variable or switchable semiconductive control element, such as a Darlington transistor. Electrical power is supplied from a power supply ... | 11/05/1996 |
| 5565760 | Electrical propulsion systems for a golf car A method and apparatus for preventing overspeed of an electrically powered golf car having a shunt wound direct current electric motor with an armature winding and a field winding serially connected to respective switching devices and to a source of on-bo... | 10/15/1996 |
| 5500579 | Electric motor control with integral battery charger An electric motor control with integral battery charger includes battery terminals (201) for connection to a battery (203). A boost converter circuit (111) is coupled to an armature winding (209) of the electric motor (117), and has an input (131) coupled... | 03/19/1996 |
| 5493186 | Sub-exiter control for the series winding of a series-type or compound DC motor or generator Sub-excitation of a series-type excitation magnetic field winding for a DC motor or generator is provided by an auxiliary power supply which, when the voltage in the main circuit is low, supplies voltage through a diode to the main series field winding in... | 02/20/1996 |
| 5489828 | Electric drive system in lift trucks An electric drive system in lift trucks has, for driving the lift truck driving wheels, at least one separate excitation electric motor provided with a stator and a rotor which are energized independently of each other by means of an electronic drive and ... | 02/06/1996 |
| 5483615 | Direct current electrical motor system and method of using same A direct current (DC) electrical motor system includes a DC electrical motor having energy conversion armature windings conducting a first electric current, and an electromagnetic field windings conducting a second electric current. The system also includ... | 01/09/1996 |
| 5453672 | Regulation system for decoupled efficiency optimized operation of DC traction motors A regulation system for controlling a dc motor having a separately excited armature and field includes microprocessor based pulse width (duty cycle) and frequency modulation control of an armature amplifier and a field amplifier. Motor operating efficienc... | 09/26/1995 |
| 5070283 | Traction motor controller for forklift vehicles A system for controlling separately excited shunt-wound dc motors, where control is achieved through microprocessor-based independent PWM control of a chopper (armature) and an H-bridge (field). Connected to the armature is an armature voltage amplifier f... | 12/03/1991 |
| 5039924 | Traction motor optimizing system for forklift vehicles A system for optimizing control of separately excited shunt-wound dc motors, where optimization is achieved through microprocessor-based independent PWM control of a chopper (armature) and an H-bridge (field). Connected to the armature is an armature volt... | 08/13/1991 |
| 4845413 | Device for controlling the field current of DC motors A device for controlling the field current of a DC motor supplied from an AC network and which is operated beyond the normal speed of the DC motor in the higher speed range obtainable by weakening of the field of the DC motor, there being provided for the... | 07/04/1989 |
| 4506200 | Method and apparatus for operating a d.c. motor Method and apparatus for the operation of a direct current (d.c.) motor requiring no start-up resistor and accompanying switches. Regenerative braking is obtained and the torque interference in the operation is carried over to the electrical input after b... | 03/19/1985 |
| 4484117 | Microprocessor-based control apparatus for a direct current machine drive system A microcomputer for use with a direct current machine drive system processes machine drive system currents and voltages to compute real time machine efficiency. From real time machine efficiency, the microcomputer determines optimum, that is to say, desir... | 11/20/1984 |
| 4475070 | Motor torque control with improved linearity A direct current motor control circuitry provides linearity between an input signal to the circuitry and torque developed in the motor energized by the circuitry. A signal divider algebraically divides a numerator signal by a denominator signal and provid... | 10/02/1984 |
| 4408147 | Method and apparatus for high efficiency operation of electromechanical energy conversion devices A method and apparatus are disclosed for controlling the conversion of electrical energy to mechanical energy as well as for controlling the conversion of mechanical energy to electrical energy. In a separately excited electromechanical energy conversion ... | 10/04/1983 |
| 4366420 | Electromobile control device A control device for an electromobile provided with a shunt motor includes a pattern generating means for storing, as patterns, armature and field currents capable of generating an output torque with a minimum loss in the driving system of the electromobi... | 12/28/1982 |
| 4322667 | DC Machine control circuit A control system for automatically controlling the coefficient of excitation of a DC machine comprises, in general, generator means for generating a pulse signal having a predetermined frequency and pulse width. Demand signal means are utilized for produc... | 03/30/1982 |
| 4284932 | System for driving DC motor A system for a DC motor associated with a field winding and driven by using a three-phase anti-parallel thyristor bridge circuit, comprising a first means for controlling an armature current Ia flowing through an armature of the DC motor, and; ... | 08/18/1981 |
| 4247807 | Method and apparatus for operating DC motors at high efficiency Operation of a separately excited DC motor at maximum efficiency is achieved by continuously varying armature and field current in accordance with an operator-commanded motor torque amplitude signal. Armature current is varied in accordance with its magni... | 01/27/1981 |
| 4246522 | Power converter with programmable commutation A power converter having improved efficiency and useful, for example, in the propulsion system of an electric vehicle. The power converter includes a dual chopper having an output level variable over a rather wide range for controlling the speed of the ve... | 01/20/1981 |
| 4240015 | Control system and method for operating a DC motor A system applicable for use in an electric vehicle, for example, for controlling a separately-excited DC motor, permits field current control over all operating speed ranges of the motor. Below base speed a current limiting resistor is placed in series wi... | 12/16/1980 |
| 4227130 | Torque compensation system A torque compensation system is disclosed for d.c. motor drives using field weakening for speed control. A diode switching matrix and a static divider are connected so that the divider receives signals which are functions of motor armature current and spe... | 10/07/1980 |
| 4218639 | Tape tension control for tape recording and/or reproducing system A purely electrical tension control system utilizing the characteristics of a shunt motor coupled with the supply reel. In a recording or reproducing mode, the reel drive motor is forced to rotate in a direction opposite to its normal direction of rotatio... | 08/19/1980 |
| 4196377 | Control circuits for electric traction motors for vehicles An electric vehicle traction motor control circuit includes separate armature and field current controls. The armature control includes a difference amplifier connected to compare a current demand signal with an actual current signal from a transducer and... | 04/01/1980 |
