Did You Know...
...that when IBM conducted a market study of Chester Carlson's invention in 1959, the company concluded that it would take only 5000 units of his new product to saturate the market? IBM therefore declined to be part of the new product introduction. Too bad for IBM. Carlson's invention was the xerography process, and his new product was the beginning of the Xerox Corporation. It is estimated that every day, worldwide, 3,000,000,000 copies are made!!
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| Number | Title | Issue Date |
| 7400103 | Controller for a multi-phase brushless DC motor Control of rotational speed of a direct current multi-phase brushless motor is provided using an apparatus and method that works at low speed but does not depend upon Hall effect sensors. An apparatus for accelerating rotation of the motor shaft has a power stage ci... | 07/15/2008 |
| 7301295 | Stabilizer control device A stabilizer control device includes a stabilizer having torsion bars and a brushless motor having an exciting coil, a rotating direction switching device switching a rotating direction of the brushless motor, an excitation control device for controlling power suppl... | 11/27/2007 |
| 6150780 | AC motorized wheel control system Torque is distributed by calculating first and second torque commands using a requested torque and a ratio of speeds of first and second wheels and limiting them in accordance with respective torque command approved ranges and approved change rates; conve... | 11/21/2000 |
| 5831403 | Controller for an automatic door system An automatic door system includes a motor which drives a door to open and close. A CPU operating in accordance with a signal from an encoder operatively coupled to the motor detects the position of the door and prepares and applies a control signal based ... | 11/03/1998 |
| 5677609 | Intelligent servomechanism controller A servomechanism controller for controlling the movement and positioning of a servomechanism (such as that of an actuator assembly for the read/write heads of a hard disk drive assembly) in accordance with an improved "bang-bang" seek technique includes a... | 10/14/1997 |
| 5465035 | Band limited control of a flexible structure using piecewise trigonometric input signals A method and apparatus for moving a member provides parameters related to a given destination position of the member and corresponding to a switch time, a final time, an acceleration amplitude, and a deceleration amplitude. These parameters are used to sp... | 11/07/1995 |
| 5254915 | Motor control device including an improved braking control arrangement A motor control device is used for controlling a DC motor for secondary paper feeding in, for example, a copying machine. Secondary paper feeding of paper to a transfer drum is achieved by the dedicated DC motor. The DC motor is rotated at a high speed at... | 10/19/1993 |
| 5174212 | Method and apparatus for controlling train positioners using motor energy to determine the mass of the train and the mass of the train to determine maximum deceleration A method and apparatus for operating a train positioner for moving one or more railroad cars of a unit train are disclosed. The positioner is engaged with the train while the positioner is stopped at an initial location. The positioner is moved and the tr... | 12/29/1992 |
| 5014336 | Motor control In a shunt wound d.c. motor for driving centrifuges, an apparatus for obtaining smooth acceleration by regulating the bottom speed range in accordance to a preset slope current and then accelerating the armature current with full excitation. Smooth brakin... | 05/07/1991 |
| 4600865 | Transportation apparatus Transportation apparatus, such as escalators and moving walks, having controlled stopping characteristics. Deceleration is directly regulated via a deceleration servo loop which provides a current reference signal for an inner current loop. Brake current ... | 07/15/1986 |
| 4580083 | Chopper controller for a D.C. motor A chopper controller for a D.C. motor controls currents flowing in an armature winding and a field winding of the D.C. motor by controlling an armature chopper and a field chopper in accordance with a command from a command generator such as an accelerato... | 04/01/1986 |
| 4216417 | Transit vehicle motor operation control apparatus and method There is disclosed a programmed microprocessor control apparatus and method for a transit vehicle electric motor through operation of a chopper apparatus. The microprocessor program controls the motor braking effort in brake mode through operation of the ... | 08/05/1980 |
| 3976927 | Circuit for the energization of an electric motor with time delay An electric motor of the direct-current type, especially for automotive vehicles in which the motor is used for so-called motor braking in addition to normal drive, is energized through a time-delay network which ensures that excess voltage will not be ap... | 08/24/1976 |
