Quotables
"To place a man in a multi-stage rocket and project him into the controlling gravitational field of the moon where the passengers can make scientific observations, perhaps land alive, and then return to earth--all that constitutes a wild dream worthy of Jules Verne. I am bold enough to say that such a man-made voyage will never occur regardless of all future advances."
Lee deForest, American radio pioneer ; 1957
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| Number | Title | Issue Date |
| 7579796 | 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... | 08/25/2009 |
| 7545111 | Testing inverter driven electric motor shut-off path A method for testing electric motor shut-off including injecting current into an electric motor, applying at least one of a short or an open to the electric motor for a predetermined length of time, calculating the rate of decay of the current and comparing rate of ... | 06/09/2009 |
| 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 |
| 7385364 | System and method for detecting back electromotive force with automatic pole calibration A system and method for determining the rotational speed of a motor, such as a three-phase disk drive motor, detects back electromotive force voltage generated during operation of the motor with an automatic pole calibration to minimize or eliminating variations in ... | 06/10/2008 |
| 7382104 | Backpack style power-pack with flexible drive and quick connect power take-off for connection to a variety of powered tools The present invention relates to portable powered devices or tools for residential, commercial, or industrial applications, in which the power source may be carried on the back of the individual user, power is transferred via a flexible drive shaft, and the powered ... | 06/03/2008 |
| 7348741 | Method and device for controlling fan for cooling vehicle-mounted battery A vehicle which uses an internal combustion engine and a motor generator as drive sources is provided with a battery disposed under a seat and a fan for cooling the battery. Power is exchanged between the motor generator and battery via an inverter. An electronic co... | 03/25/2008 |
| 7332883 | Method and apparatus for initializing operation of a disk drive Disk drives such as hard (magnetic) disk drives take a certain amount of time to initialize and “spin up” to the operational rotational speed of the disk or disks, thereby creating a time lapse from power up to when data can first be read from or written to the ... | 02/19/2008 |
| 7227321 | System and method for detecting back electromotive force with automatic pole calibration A system and method for determining the rotational speed of a motor, such as a three-phase disk drive motor, detects back electromotive force voltage generated during operation of the motor with an automatic pole calibration to minimize or eliminating variations in ... | 06/05/2007 |
| 7170249 | Electrical phase compensation in BEMF spindle motor control A method and apparatus for compensating for the asymmetrical phases of a spindle motor in a disc drive are provided. With the apparatus and method, compensation values are learned by sampling speed data during a period of operation of the disc drive where the speed ... | 01/30/2007 |
| 7141946 | Method and apparatus for providing optimal acceleration feedback A method and apparatus for use with a motor controller that receives a command velocity and that applies voltages to drive a motor at the command velocity, the apparatus comprising a dual inertia lost motion assembly including a motor and a load couplable to the mot... | 11/28/2006 |
| 7109670 | Motor drive with velocity-second compensation An apparatus for use with a signal generator and a motor controller includes a velocity compensator, an adjustor, and a velocity regulator. The signal generator provides a reference velocity signal, and the motor controller receives an output signal and uses the out... | 09/19/2006 |
| 7026775 | Method and apparatus for controlling speed of moving body Method and apparatus for controlling a moving speed of a moving body, wherein at least one transient target speed value in addition to a final target speed value is used to control the moving speed in an accelerating period between a moment of initiation of a moveme... | 04/11/2006 |
| 7023155 | Spindle motor acceleration control Method and apparatus for accelerating a multi-phase motor having a rotatable rotor is disclosed. A first commutation state in which the rotor resides is identified, a first position of the rotor within the first commutation state is determined (preferably within one... | 04/04/2006 |
| 7012391 | Motor acceleration using continuous sequence of current limit values Method and apparatus for accelerating a motor to an operational velocity using a continuous sequence of current limit values derived from a plurality of discrete current limit values. Each discrete current limit value establishes a maximum current magnitude for the ... | 03/14/2006 |
| 6563287 | Method of controlling three phase motor starting sequence A motor starter. The motor starter comprises a motor; start, run, shorting and transition contactors operably associated with the motor; and run, start, shorting and transition auxiliary contactors. The transition auxiliary contactor operably controls the... | 05/13/2003 |
| 6552507 | MOTOR VELOCITY AND ACCELERATION DETERMINING METHOD, ACCELERATION/DECELERATION GENERATING METHOD, ACCELERATION/DECELERATION CONTROLLING METHOD, ACCELERATION/DECELERATION CONTROLLING APPARATUS AND MOTOR CONTROLLING APPARATUS Acceleration/deceleration control is performed on the basis of a designated jerk control such that a maximum absolute value Jmax of jerk value, which is differential value of acceleration, is made not larger than a predetermined value when a commanded qua... | 04/22/2003 |
| 6528962 | Control unit and method for controlling motor for use in printer, and storage medium storing control program A control unit suppresses fluctuation in speed of a motor in a printer. The control unit has a speed detecting part for detecting the speed of the motor in a predetermined period tv, and an average speed calculating part for calculating an aver... | 03/04/2003 |
| 6501244 | Method and apparatus for controlling a high-speed AC permanent magnet synchronous motor coupled to an industrial turbo engine A method and apparatus for controlling a permanent magnet synchronous motor (8) coupled to a turbo engine such that transient current and steady state current are minimized. The method comprises the steps of, for a given DC bus voltage, determining an acc... | 12/31/2002 |
| 6492789 | Method and apparatus for controlling a high-speed AC permanent magnet synchronous motor coupled to an industrial turbo engine A method and apparatus for controlling a permanent magnet synchronous motor (8) coupled to a turbo engine such that transient current and steady state current are minimized. The method comprises the steps of, for a given DC bus voltage, determining an acc... | 12/10/2002 |
| 6040666 | Machine tool control system and machine tool control method, and detection system and detection method therefor A machine tool has a spindle with a tooling body mounted thereon, a detector for detecting an acceleration time for the tooling body to reach from a rotation start to a predetermined rpm, a controller for controlling an rpm of the spindle under a lowered ... | 03/21/2000 |
| 5960376 | Moving object controller containing a differential of acceleration measurer In order to control a movable object such as an automobile, the differential of acceleration is derived and used as control information. In order to derive that differential, a value representing the acceleration may be differentiated, but preferably a se... | 09/28/1999 |
| 5877955 | Transducerless position determining system and method for the same A transducerless position determining system and method of using the same for determining the relative position of a mechanical member or component which is driven by an electric motor within an electromechanical system. The transducerless position determ... | 03/02/1999 |
| 5485065 | Position commanding method and apparatus A position command method and apparatus for shortening the acceleration and deceleration times of a servo controlled apparatus by effectively utilizing the torque of the controlled apparatus. A value of speed per unit time is developed on the basis of spe... | 01/16/1996 |
| 5323097 | Method for producing a speed reference signal for crane motor control A procedure for producing a speed reference signal for a crane motor control when the converter feeding the motor is controlled by means of at least one manually operated controller. To allow the speed reference signal to be changed, the controller has a ... | 06/21/1994 |
| 5207520 | Printer carriage acceleration control device A device for PWM control of the printer carriage motor (1) which has a circuit (65) for generating a first PWM pulses of 100% duty ratio, a circuit for computing second PWM pulses (31, 37, 39, 15, 17, 53, 57, 59) according to the PI control method based o... | 05/04/1993 |
| 4808895 | Acceleration control apparatus This invention provides an acceleration control apparatus suitable for use as various kinds of feed control. A comparator circuit compares a command value supplied from an acceleration commanding unit and an actual value of acceleration detected by a sign... | 02/28/1989 |
