Did You Know...
...that the Slinky toy was the result of a failed attempt by engineer Richard James to produce an antivibration device for ship instruments? His goal was to develop a spring that would instantaneously counterbalance the wave motion that rocks a ship at sea. Instead, he developed the Slinky.
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| Number | Title | Issue Date |
| 7675259 | Controller for DC motor A first determining section determines whether a recording medium is conveyed in a first direction. A setting section sets a first current value as a current initially outputted to a DC motor each time the first determining section determines that the recording medi... | 03/09/2010 |
| 7317264 | Method and apparatus to independently control contactors in a multiple contactor configuration A method and apparatus to independently control the closing or making of contactors in a modular contactor assembly is disclosed. The apparatus includes a contactor assembly having multiple contactors such that each contactor is separately controlled such that one c... | 01/08/2008 |
| 7283887 | Method for determining a change in direction of rotation of a motor A method for determining a change in direction of rotation of a motor includes the steps of establishing steady state operating parameters of the motor, triggering a command interrupting the rotation of the motor, estimating the speed of the motor after triggering t... | 10/16/2007 |
| 7202627 | Load and speed sensitive motor starting circuit and method A circuit and method measures main motor winding voltage and detects points in the electromagnetic wave cycle where this voltage “crosses” zero. It also measures auxiliary motor winding voltage. Phase shifts measured in the auxiliary winding are compared as a me... | 04/10/2007 |
| 7098554 | Steering shaft locking device A steering shaft locking device capable of performing a locking operation in an optimum manner. The steering shaft locking device includes a motor to which voltage is applied to generate a drive force. A locking bar is moved by the drive force of an actuator so as t... | 08/29/2006 |
| 6731092 | Apparatus and method for initializing stepper motor A stepper motor is initialized so that the exciting signal is applied to coils with the step shifted by half of one electric cycle from the rebounding step being synchronized with the timing when the stopper piece is brought into contact with a fixed stopper. The re... | 05/04/2004 |
| 6304046 | Driving control circuit of a hood motor A driving control circuit of a hood motor, including: a hood motor section rotatably driven for ventilating the inner portion of a system; a rectifier circuit section for supplying direct current power to the hood motor by rectifying alternating current p... | 10/16/2001 |
| 5936375 | Method for energy storage for load hoisting machinery A method for energy storage and recovery for load hoisting equipment driven by an inverter controlled first induction motor and having a second inverter controlling a second induction motor which drives a flywheel whereby, utilizing rest power such as rev... | 08/10/1999 |
| 5504965 | Electrically heated wiper blade utilizing spiral coiled resister wire A heated windshield wiper blade unit suitable for incorporating into existing or new windshield wiper assembly. The blade comprises a spiral coiled heating element of resistance wire, such as Nichrome, disposed in the blade substantially along its entire ... | 04/09/1996 |
| 5404088 | Circuit for increasing motor output to compensate for increased load A circuit for boosting the power output of a motor in which a sensor stage, preferably a voltage divider, is coupled to comparator stage, preferably a reverse biased to a diode, which in turn is coupled to a power boost stage, preferably a relay and switc... | 04/04/1995 |
| 5289099 | Direct current motor A three-phase Y-connection direct current motor, which is not only capable of operating at a high efficiency and at high speeds but also small-sized and inexpensive. A position detection device includes three Hall elements for detecting the rotational pos... | 02/22/1994 |
| 5252904 | Auto reverse circuit A control circuit for connection to a split capacitor motor automatically switches to reverse operation when the motor is caused to stop or slow unacceptably by a heavy load. During operation, a voltage is maintained across a relay winding which is suffic... | 10/12/1993 |
| 5103152 | Drive control circuit for sensorless type three-phase half-wave motor A level detector outputs signals every time voltages induced by the U-phase, V-phase and W-phase motor coils exceed a predetermined level. When the signals are output in a predetermined order from the level detector, U-phase, V-phase and W-phase commutati... | 04/07/1992 |
| 5086492 | Switching current regulator for motor control An improved motor control circuit is disclosed in which energy stored in the motor is transferred back to the power supply rather than being passively dissipated. The sense of a feedback signal is reversed at a summation node by combining the signal with ... | 02/04/1992 |
| 4962976 | A.C. motor drive method and apparatus for precision positional control A polyphase induction motor is driven from an inverter having a set of switches activated in prescribed on-off patterns to provide forward and reverse voltage vectors and a zero vector for controllably energizing the motor. Memories are provided on which ... | 10/16/1990 |
| 4881020 | Apparatus for controlling attitude of vehicle mounted device An imaginary limit position is determined on the basis of a position where an overload condition is detected, and such imaginary limit position is stored. Subsequent to the storage, an extent of movement is limited to that defined by the limit position. A... | 11/14/1989 |
| 4851747 | Non-precise heat control operation periodic positive & reverse circulating fan A manually controlled positive and reverse circulating fan is used in room, usually, when in summer to blow air is downward so that the cool air at the lower level can be spread into every corner of the room. In winter, the fan is operated reversely and t... | 07/25/1989 |
| 4794288 | Series resonant capacitor motor A series resonant capacitor motor is operated from a source of single phase alternating current power, and the start and run windings are wound on the stator electrically angularly displaced from one another by 90°. The run winding is of heavy wire, and ... | 12/27/1988 |
| 4761578 | Method and means for operating brushless DC motor with reversible DC power A circuit for operating a brushless DC motor, the circuit receiving as inputs the positive/negative, or negative/positive DC power normally applied to reverse a brush-type DC motor, with the polarity of the input power determining direction of rotation of... | 08/02/1988 |
| 4745347 | Low cost instant reversing circuit In a single phase AC induction motor having a main winding (1) and an auxiliary winding (2) both connectable to an AC power source (4), and having a start switch (6, 74) for automatically connecting and disconnecting the auxiliary winding (2) to and from ... | 05/17/1988 |
| 4649330 | Controlling device of a drill for regular and reversed rotation in non-contact type A device for changing the rotation of a drill from a forward to a reverse direction which comprises a drill, an AC single-phase motor operatively connected to the drill for driving the same, a circular measuring plate connected to the drill, the circular ... | 03/10/1987 |
| 4527663 | Apparatus for controlling an AC power elevator An apparatus for controlling an AC powered elevator and for improving the safety of the operation of the elevator includes: a three-phase AC power source; a drive device connected to the three-phase AC power source for converting an AC signal into an AC p... | 07/09/1985 |
| 4463293 | Method and apparatus for shutting off a power screwdriver A power screwdriver that is equipped with a spring coupling between the motor drive and the tool spindle, a signal that indicates that a certain value of torque has been overstepped, at which the screwdriver must be sopped, first causes reversal of the mo... | 07/31/1984 |
| 4365188 | Circuit arrangement for monitoring and controlling closing and opening movements Closing and opening movements are effected by a reversible motor M. The motor M receives its power from a supply U via a feed circuit which includes switch contacts r1, r2 controlled by a relay R. The arrangement is such that a closi... | 12/21/1982 |
| 4335342 | Reciprocating drive system for a body such as a carriage supporting electrostatic means for spraying a pulverized material, the system including an asynchronous squirrel cage motor A reciprocating drive system moves a body of defined inertia, such as a carriage supporting electrostatic spraying means, at full speed between two points at which the direction of movement is reversed. The drive system includes an electric motor with pol... | 06/15/1982 |
| 4258969 | Reversing plug connector A pin-and-socket type reversing plug connector for three-phase alternating current motors has three phase pins and two internally connected ground pins in a motor-connected member and corresponding sockets in a line-connected member. The five pins and soc... | 03/31/1981 |
| 4243920 | Control device for monitoring machines driving revolving devices and method for operating the device Control device responding to current changes in a load circuit including a supervisory circuit carrying a current proportional to the current in the load circuit, a transformer coupling the supervisory circuit to the load circuit, and an overcurrent senso... | 01/06/1981 |
| 4234833 | Door operator system using counter circuit for determining limit positions The shaft driven by a reversible motor for opening and closing a door is provided with at least one reflective surface. An optical source/detector senses rotation of the shaft and generates a pulse each time one of the reflective surfaces passes. A progra... | 11/18/1980 |
| 4152634 | Power contactor and control circuit The power contactor for controlling the application of power to and the character of the current to a load includes a power relay having contacts connected between a source of power and the load, such as a motor or heater, with each of the contacts being ... | 05/01/1979 |
| 4101819 | Three phase controlling system In a three phase load controlling system two bilateral switching circuits control the current in the first and the third phases; the first phase is later than the third. The second phase is uncontrolled. The gating signals applied to the bilateral switchi... | 07/18/1978 |
| 4045682 | Phase reversal protection system A three-phase motor system is described incorporating a small fractional horsepower three-phase control motor that is connected to rotate in a predetermined direction when a three-phase drive motor is rotating in a predetermined direction. A plurality of ... | 08/30/1977 |
| 4045715 | Operator motor control Control system including radio receiver circuit for a power-driven operator for garage doors and the like comprising an operator control circuit having a regulated DC voltage source operating as a power supply for an electronic flip-flop device responsive... | 08/30/1977 |
| 4034725 | Electric governor An electric governor for an internal combustion engine comprises an engine speed sensor, a phase shifter, a twin-T type filter and a multiplier for multiplying outputs of the phase shifter and the twin-T type filter. The twin-T type filter is arranged to ... | 07/12/1977 |
| 4008421 | Methods and apparatus for speed-control of induction motors A method of energizing a single-, three-, or poly-phase A.C. motor for continuously-variable speed control from a fixed-frequency supply of corresponding phase. Each phase is modulated by a continuously-variable modulation wave of sub-supply frequency to ... | 02/15/1977 |
| 3997826 | Valve operator circuit with provision for presetting A valve operator circuit normally operates to compare the pulse rates of two trains of pulses and to step an associated valve open or closed depending on which of the two pulse rates is the higher. The circuit includes a manually-operated presetting arran... | 12/14/1976 |
