Did You Know...
...that a workman who left the soap mixing machine on too long was responsible for making Ivory Soap? He was so embarrassed by his mistake that he threw the mess in a stream. Imagine his dismay when the evidence of his error floated to the surface! Result: Ivory soap, the soap that floats.
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| Number | Title | Issue Date |
| 8076873 | Hybrid outdoor power equipment Hybrid power equipment comprising a user-selectable power selection switch for switching between DC or AC power, a boost and conserve feature for increasing speed of the working elements as necessary, and a motor or a plurality of motors for moving working elements.... | 12/13/2011 |
| 7345437 | Rechargeable vacuum with reduced AC voltage A motor is disclosed that operates on either AC outlet power or DC battery power with decreased power drop when switching between AC and DC power. The AC power to the motor may be stepped down by using a clipper circuit, while the DC power supplied to the motor may ... | 03/18/2008 |
| 7259530 | Power output apparatus, motor driving method and computer-readable recording medium having program recorded thereon for allowing computer to execute motor drive control A control CPU generates, in response to a signal STON from a start key, a signal SE at H level and outputs the generated signal to a relay to render system relays ON. Accordingly, a DC power supply is connected between respective neutral points of three-phase coils.... | 08/21/2007 |
| 7242105 | Electric engine start with two motors and single motor drive An electrical starter-generator system includes a first starter-generator and a second starter-generator. A single drive controls both the first starter-generator and the second starter-generator such that their electrical current and power inputs are minimized and ... | 07/10/2007 |
| 7116066 | Power supply circuit of a high speed electric motor A power control system (12) for an electric motor having at least one magnetic bearing includes a DC/DC converter (18) supplied from a DC link bus (179) connected to a main power supply (14), the bus (17) supplying power for the el... | 10/03/2006 |
| 7102304 | Control device for a reversible rotating electrical machine The invention relates to a control device for a reversible, multi-phased rotating electrical machine which can operate in alternator or motor mode. The inventive device comprises a main battery (4), an electric network (5) and a unit (3) for con... | 09/05/2006 |
| 6920718 | Independent backup power supply for a security barrier A system is disclosed for providing a backup power supply for a security gate system. In a preferred embodiment it includes a primary power supply, an AC motor and an auxiliary DC motor that share the same accessory devices including controller, movement mechanism, ... | 07/26/2005 |
| 6812657 | Motor control for two motors A load in an electrical apparatus is driven by two motors M1, M2. Switching means (R1, R2) switches the motors M1, M2 between: a series configuration, in which the motors M1, M2 are connected in series across a... | 11/02/2004 |
| 6404151 | Electric vehicle drive An electric vehicle drive has an electric machine which can be alternatively driven as a motor or as a generator and has a d.c. connection to which a supply voltage can be applied, from a first energy source and/or a second energy source. The first energy... | 06/11/2002 |
| 5886889 | Device and method for direct current power supply to a traction system by means of converters from different alternating current or direct current voltages A device and a method are disclosed for direct current voltage power supply to a traction system by means of converters from different alternating current or direct current voltages available on a power supply line. The power supply device is supplied wit... | 03/23/1999 |
| 5880537 | Uninterruptable power supply An uninterruptable power supply, operating normally under power supplied by a utility, has a main motor, a smaller induction motor, and a mechanical load such as a generator coaxially coupled together. A battery is connected to the smaller induction motor... | 03/09/1999 |
| 5852333 | Electric actuator return-to-normal using capacitor energy storage with regulated output An electric actuator return-to-normal failsafe system that utilizes a bank of storage capacitors to store electrical energy for returning an electrical actuator to a safe position in the event of a power failure. The failsafe system includes a regulator c... | 12/22/1998 |
| 5818194 | Direct replacement variable speed blower motor A blower motor unit having a variable speed motor and that is suitable for direct, drop-in replacement in a residential HVAC (heating, ventilation, and air conditioning) system that employs a PSC motor. The blower motor unit is provided with a neutral inp... | 10/06/1998 |
| 5789894 | Solid state motor speed control A solid state motor speed control is described that is capable of controlling a motor so that it operates quietly, eliminating annoying buzzing noises that would otherwise be generated by the motor's windings. The invention provides for motor speed contro... | 08/04/1998 |
| 5757148 | Method of and apparatus for stopping a motor having magnetic bearings A motor having windings normally energizable by electric power from an AC power supply is stopped in case of an emergency such as a failure of the AC power supply. The motor has a rotor rotatably supported by magnetic bearings out of contact therewith. Th... | 05/26/1998 |
| 5684376 | Solid state motor speed control A solid state motor speed control is described that is capable of controlling a motor so that it operates quietly, eliminating annoying buzzing noises that would otherwise be generated by the motor's windings. The invention provides for motor speed contro... | 11/04/1997 |
| 5629592 | Electric vehicle control device in both an alternating current section and a direct current section While an electric vehicle is traveling in a DC section, a ripple component detecting unit detects a ripple component appearing on a filter capacitor voltage and adds the ripple component onto an inverter frequency reference in such manner as to cancel an ... | 05/13/1997 |
| 5629591 | High-availability multicurrent power supply system for the traction unit of a railway locomotive A system for powering a multicurrent locomotive having 2N motors where N is greater than or equal to 2, the system comprising 2N pairs of voltage converters respectively associated with the 2N motors, each motor Mi being powered by means of an ... | 05/13/1997 |
| 5367600 | Motor control for a treadmill having improved power supply and improved speed regulation under intermittent loading A motor control for a treadmill has an improved, inexpensive, and simple set of power supplies, derived from the bus voltages of the DC busses with simple voltage dividers, to supply operational amplifiers connected to the positive DC voltage bus with a d... | 11/22/1994 |
| 5304900 | Spinning frame A flyer frame has a first AC motor for obtaining a general rotational movement of various parts of the frame and a second AC motor for obtaining only a variable component of the rotational movement of the bobbin. An inverter is provided for operating the ... | 04/19/1994 |
| 5148090 | Variable reluctance type AC servo motor This invention determines the configurations of a rotor (10) and a stator (12) and conductance periods and conductance phases of the conductance currents to obtain a smooth rotation of a variable reluctance motor as an AC servo motor. When the number of p... | 09/15/1992 |
| 5099186 | Integrated motor drive and recharge system A drive and recharge system is disclosed that includes a bidirectional dc power source, two voltage-fed inverters, two induction motors, and a control unit. In the drive mode, power is bidirectionally connected between the dc power source and the motors. ... | 03/24/1992 |
| 4649287 | Bidirectional control system for energy flow in solar powered flywheel An energy storage system for a spacecraft is provided which employs a solar powered flywheel arrangement including a motor-generator which, in different operating modes, drives the flywheel and is driven thereby. A control circuit, including a threshold c... | 03/10/1987 |
| 4423364 | Electric motor damper drive with backup power pack An electric damper motor drive with a backup power pack is disclosed comprising a reversible electric motor operable in first and second opposite directions in response to first and second distinct forms of electrical energization, respectively. A primary... | 12/27/1983 |
| 4341982 | Simultaneous independent control system for electric motors A system for simultaneously and independently controlling a plurality of electric motors from a number of dispersed stations. The system operates by transmission of duty cycle modulated selected frequencies superimposed on a DC track voltage on a common p... | 07/27/1982 |
| 4131827 | Power transfer apparatus A power transfer apparatus transfers electrical energy from a DC voltage source that may vary in potential, e.g., a solar cell array, to a load such as a DC motor connected to drive an AC motor-generator. A power transfer device couples the solar cells to... | 12/26/1978 |
| 3988655 | Apparatus to control the direction of movement of a mechanism Apparatus to control the direction of movement of a mechanism over a surface. The surface is provided with a plurality of substantially parallel strips of conductive material alternately connected to opposite terminals of a source of current supply. The m... | 10/26/1976 |
