Did You Know...
...that in the early 1940s GE engineer James Wright was charged with a task of utmost importance to the war effort: develop a cheap substitute for rubber that could be used to produce tires, gas masks and a whole host of military gear. Wright tackled the task diligently -- and wound up inventing Silly Putty.
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| Number | Title | Issue Date |
| 7671550 | Motor control apparatus providing exercise resistance and auto-rewinding functions A motor control apparatus providing an exercise resistance and an auto-rewinding function mainly employs a microprocessor to operate with a current detection feedback loop and a motor rotation speed detection loop for precisely controlling a quick random operation o... | 03/02/2010 |
| 7339335 | Brake system and method for a DC brush motor without a hall sensor A brake system and method for a direct current brushed motor without a Hall sensor are provided. After the system is activated, the motor is pre-braked in order to detect and record the stationary armature current while the motor is in a stationary state. As the mot... | 03/04/2008 |
| 7323842 | Rotating electrical machine A rotating electrical machine has a housing with a shaft mounted rotatably in it. A rotor is fixed to the shaft and has a plurality of magnetic poles. A stator is positioned about the rotor and has a winding. A switch is mounted within the housing and has a first po... | 01/29/2008 |
| 7194348 | High acceleration time shift control apparatus and control method for vehicle A high acceleration time shift control apparatus and method for a vehicle is provided. The high acceleration time shift control apparatus includes a transmission which achieves plural shift speeds whose gear ratios are different from each other; and a high accelerat... | 03/20/2007 |
| 7053570 | Control circuit for a dual directional direct current motor employing a single alternating current power source A control circuit operates a dual directional DC motor from an AC power source. A controller has first and second position indication inputs adapted to receive respective first and second position indications. The controller also has first and second direction outpu... | 05/30/2006 |
| 6922032 | Electric motor control device In the driving operation of a sensorless three-phase motor to be used in a rotation at a comparatively low speed (approximately 2000 RPM or less) and to be bipolar driven, the number of rotations and a rotating position are accurately detected from an induced voltag... | 07/26/2005 |
| 6484633 | Side wall for an ink fountain of a printing machine The side wall (5) for an ink fountain of a printing machine has two plates (11, 14) fixed some distance apart and an intermediate plate (13) having a front edge (13a) in the shape of an arc of a circle. This intermediate plate (3) is mounted between the p... | 11/26/2002 |
| 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 |
| 6097126 | Three-phrase reluctance motor A three-phase reluctance motor includes, a stator having a plurality of magnetic poles around which coils corresponding to three phases are wound, a rotatable rotor having a plurality of convex poles opposed to the magnetic poles of the stator, a magnet p... | 08/01/2000 |
| 5956249 | Method for electromechanical control of the operational parameters of a door in conjunction with a mechanical door control mechanism A method is disclosed for selective alteration and control of door movement modes utilizing an apparatus that is primarily non-hydraulic and incorporated with a known mechanism which is functional independently from the apparatus in one mode of operation ... | 09/21/1999 |
| 5859509 | Adjustable speed control for children's ride-on vehicle An adjustable speed control for use on a children's ride-on vehicle, where the speed control includes a switch assembly interposed between the battery and the motor of the vehicle. The switch assembly is selectively operable to connect the battery to the ... | 01/12/1999 |
| 5828194 | Control circuit for control of a direct-current motor normally excited in series including structure for separate excitation during braking A control circuit provides, for connecting a motor to a d.c. voltage source (1), two half bridge (3, 7, 5, 9) each with a respective switch (3, 5) with controlled opening and closing; the first of the half bridge connects a pole of the excitation winding ... | 10/27/1998 |
| 5581165 | Device for controlling rotational direction of a direct current motor and applying brake thereto This invention relates to a mechanism for controlling rotational direction of a direct current motor and a applying brake thereto and in particular to one including a cathode connected to a negative pole of a battery, an anode connected to a positive pole... | 12/03/1996 |
| 5528115 | Inductive load drive circuit for eliminating back electromotive force caused by a load An inductive load drive circuit for driving an inductive load, such as a motor, and for preventing charging of a power source by the back electromotive force of an inductive load. The inductive load drive circuit uses a battery as the power source for sup... | 06/18/1996 |
| 5311107 | Method and apparatus for stopping DC motor by brake power corresponding to rotation frequency of motor and disk storage unit having such apparatus A motor stopping apparatus detects a rotation frequency of a motor to which a load is attached, and applies break power in accordance with the rotation frequency to the motor until the motor is approximately stopped. The apparatus may be provided in a dis... | 05/10/1994 |
| 5139156 | Variable speed electric hoist A variable speed electric hoist includes an invertor unit for frequency-controlling the speed of rotation of a lifting motor, a brake on/off section for turning off a brake according to a command produced from the invertor unit while the invertor unit is ... | 08/18/1992 |
| 4933609 | Dynamic control system for braking DC motors A system for controlling a pulse-driven dc motor includes a pulsed grounding switch, an inductor connected between the pulsed grounding switch and the armature of the dc motor, and a tracking circuit connected across the inductor. The control system furth... | 06/12/1990 |
| 4914362 | Electric circuit with limit switches for limiting rotatable range of electric drive unit An electric circuit with limit-switch for limiting rotatable range of an output shaft of an electric drive unit disposed between an electric motor and a control device for supplying a drive current thereto, comprising a first snap action limit switch disp... | 04/03/1990 |
| 4767970 | Dynamic brake control for a tape drive system In a tape drive system, a dynamic brake control circuit provides dynamic braking for slowing and stopping an associated tape reel and motor system in the event of a power failure. Upon sensing a power failure, the electrical energy stored in a capacitor s... | 08/30/1988 |
| 4725764 | Switch arrangement In connection with a switch arrangement for circuit-making and circuit-breaking, as well as for controlling the speed of, electric machines it is proposed to provide a double-pole circuit-maker and circuit-breaker safety switch and to connect it in series... | 02/16/1988 |
| 4698622 | Brake apparatus for automatic door A brake apparatus for automatic doors including a speed pulse signal output device for providing speed pulse signals at a time interval inversely proportional to the door speed of an automatic door, a brake for slowing the door speed, a braking position d... | 10/06/1987 |
| 4687975 | Motor control with radio control device A motor control device for a radio control system is disclosed. The motor control device is mounted on an object to be controlled so as to adjust a control range in each of forward, braking and backing of the object. The motor control device is provided w... | 08/18/1987 |
| 4639646 | Two pedal, three-way control for child's riding toy A child's battery-powered riding toy includes a floorboard with two spring-biased switches that must be closed by the child operator to place the vehicle in self-powered motion and can only be reached simultaneously of the child operator is safely aboard.... | 01/27/1987 |
| 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 |
| 4568863 | Controller for electric brake motors A control circuit for regulating the application and release of brake force in an electric brake. A pulse width modulator presents an output signal of regulatable duty cycle to power drivers connected to the electric motors of the brake. A control circuit... | 02/04/1986 |
| 4556831 | Circuit arrangement for electrical tool with clutch In an electrical tool having a clutch for adjusting rotational torque of the driven shaft, a limit switch of double-throw type is used for detecting the state of the clutch, and a capacitor is arranged to be charged via the limit switch. In one embodiment... | 12/03/1985 |
| 4532462 | Electric actuators An electric actuator having an electric motor operable to control the output force generated by a spring system of the actuator on an output member of the actuator; measuring means responsive to a characteristic of the spring system which is indicative of... | 07/30/1985 |
| 4498033 | Automatic door actuator Disclosed is an automatic door actuator which comprises arithmetic unit for calculating a weight of a door, a distance of movement of the door and braking points of the door through learn control of door actuation which is effected once every time a power... | 02/05/1985 |
| 4422021 | Electric motor dynamic braking energy recuperating system To provide for high efficiency of recuperation of energy stored in the rotating and electromagnetic system of a dynamo electric machine, upon dynamic braking thereof, in which the dynamo electric machine is connected in a chopper-controlled series circuit... | 12/20/1983 |
| 4396877 | Reversible electric drive with bidirectional back-current brake and fed by a rectifier supplied from alternating current mains, preferably for motor arc furnace regulators A reversible electric drive with bidirectional back-current brakes fed by a rectifier supplied from a pair of A.C. power lines for a D.C. motor having two directions of rotation and two poles, comprises a control rectifier bridge for each direction of rot... | 08/02/1983 |
| 4386299 | Electronic control circuit for a separately excited DC machine An electronic circuit designed to control entirely by electronic means the change from traction mode to braking mode and vice-versa of a separately excited DC machine and the forward and reverse operation of the motor as well as rheostatic braking. The ch... | 05/31/1983 |
| 4359208 | Emergency brake control for hoists An emergency brake control system for hoists including means for generating a first electrical signal indicating the direction of travel of a conveyance, means for generating a second signal indicating the presence or absence of an emergency situation and... | 11/16/1982 |
| 4336482 | Rear window wiper motor control A windshield wiper system having an electric motor for driving windshield wipers through repeating wiper cycles by reversing the direction of rotation of the motor through a reversing switch comprising a pair of relays which control the polarity of curren... | 06/22/1982 |
| 4279490 | Electric driving device In the disclosed device, forward and reverse rotation of a motor is used to wind and rewind a camera. A first semi-conductor switching element becomes conductive during winding and a second semi-conductor switching element becomes conductive during rewind... | 07/21/1981 |
| 4225811 | Direct current motor with polyphase stator winding and electronic commutating device controlled by an angular position transmitter In a D.C. motor in which signals generated by an angular position transmitter control the commutation of the current flowing through the stator winding via a selection circuit containing Exclusive OR gates by means of which the polarity of the signals gen... | 09/30/1980 |
| 4079299 | Positioning control means for motor driven rotary tap changer A rotary tap changer or switch is rotated by a motor to a plurality of contactor positions by a control system having a cam that rotates to activate limit switches respectively corresponding to contactor positions. The activation of the limit switches cau... | 03/14/1978 |
| 4072404 | Control mechanism for positioning projection screen in closed position A projection screen apparatus includes an elongate roller, a flexible screen which is wound on the roller when it is in a closed position and unwound from the roller when it is in an exposed position, an electric drive motor connected to the roller for ro... | 02/07/1978 |
| 4049998 | Control circuit for an electrically driven vehicle A control circuit for an electrically driven vehicle which employs a separately excited motor. The armature is connected in series with a current control between two supply rails. The field winding is likewise connected between the rails, but has associat... | 09/20/1977 |
| 3978384 | Bidirectional motor drive using switched amplitude controlled current In the computer field tape handlers for magnetic tape are widely used. The magnetic tape is moved by a capstan driven by a high power low inertia motor since it is necessary to rapidly accelerate and decelerate the tape in both forward and reverse directi... | 08/31/1976 |
| 3967175 | Automatic sequencing scheme for reversing directions of electric traction motors In an electric propulsion control system for self-propelled traction vehicles having reversible, variable speed tractiOn motors, wherein the operation of a direction selector means overrides the normal speed controlling means and initiates a dynamic retar... | 06/29/1976 |
