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| Number | Title | Issue Date |
| 7471057 | Servo-control system for an unbalanced rotor vibrator The invention applies to a vibrator comprising two pairs (A, B) of unbalanced rotors (10 to 13) driven in synchronous rotation by a first motor, and a second motor arranged to drive a phase shifter mechanism so as to adjust a phase difference between t... | 12/30/2008 |
| 6803740 | Method and apparatus for determining phase current of switched reluctance electric machines A method for determining phase current for each of a plurality of individual phase coils of a switched reluctance machine (SRM) is disclosed. In an exemplary embodiment, the method includes determining the current passing through a first resistive element and a seco... | 10/12/2004 |
| 6596076 | Apparatus and method for altering the apparent effects of gravity There is disclosed an apparatus and method that appear to alter the effects of gravity by generating a magnetic field that causes an upward/downward magnetic force to act on a substance in a container. This offsets or adds to the downward force of gravity... | 07/22/2003 |
| 5783923 | Method and apparatus for multiple-input, multiple output feedback control of variable load systems In a feedback control system with multivariable inputs and outputs, a network of plant actuators, each controlled by self-adaptive feedback control loops with pole-tracking zeroes, is provided as a plant or output load for a network of generally-conventio... | 07/21/1998 |
| 4319172 | Numerical control system A numerical control system is provided for a table having a relatively stationary member, a relatively movable member and a position transducer, such as an inductosyn, operatively positioned between them. The numerical control system comprises a high freq... | 03/09/1982 |
| 4206485 | Digital phase servo system In a digital servo system suitable for controlling the rotational phase of a rotating body, such as, the rotary head drum of a video tape recorder (VTR), a binary output signal is provided, as a phase error signal, based upon the phase relation between a ... | 06/03/1980 |
