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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 |
| 7348744 | Brushless DC motor drive apparatus A brushless DC motor drive apparatus for driving a rotor includes a drive circuit rotating the rotor, a current shutdown and auto-restart circuit coupled to the drive circuit, and a DC voltage comparison circuit coupled to the current shutdown and auto-restart circu... | 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 |
| 7253580 | Method and apparatus for adaptive motor speed control A different adaptive control method is used to control a motor during each of two or more phases of motor operation. Thus, in a first phase of motor operation the motor is controlled using a first adaptive control method, in a second phase of motor operation the mot... | 08/07/2007 |
| 7196491 | System and method for stall detection of a motor A motor starter system comprises solid state switches for connection between an AC line and motor terminals for controlling application of AC power to the motor. A voltage sensor senses AC line voltage and the motor terminal voltage. Current sensors sense motor curr... | 03/27/2007 |
| 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 |
| 7102309 | Apparatus for compensating for speed error of motor The present invention discloses an apparatus for compensating for a speed error of a motor which can reduce a speed ripple of the motor resulting from load characteristics, and which also can reduce vibrations and noises. The apparatus for compensating for the speed... | 09/05/2006 |
| 7091685 | Overload protection for DC motors A closed-loop system 10 is provided for controlling a DC motor. The system includes a DC motor 12, a controller 18 associated with the motor and constructed and arranged to control operation of the motor, a voltage sensor 14 constructed a... | 08/15/2006 |
| 7061194 | Method and apparatus for controlling constant linear velocity of spindle motor using mirror signal A method and an apparatus for precisely controlling the rotation speed of a spindle motor in an optical system according to a given condition are provided. The method involves counting in response to a clock signal widths of first and second logic states of an input... | 06/13/2006 |
| 6998812 | Method for determining the mass moment of inertia of an electric motor drive system A method for determining the mass moment of inertia of an electric motor drive system of a machine, having a drive motor and further drive elements arranged downstream of the drive motor. The method includes a) determining a compensation current, which compensates l... | 02/14/2006 |
| 6920027 | Fast, variable, and reliable power system controller design A power system controller design for controlling fault current or load flow current by applying a variable inductive impedance. The device comprising multiple stages of transformers connected such that their primary coils are in series and carry the primary power. T... | 07/19/2005 |
| 6915538 | Smooth start system for power chair An apparatus, method and program product gradually and automatically accelerates or decelerates chair motor speed to achieve a smooth, nearly imperceptable movement of the chair. To this end, voltage is apportioned to the motor according to an acceleration profile. | 07/12/2005 |
| 6836087 | Multiphase motor voltage control for phase windings of different wire gauges and winding turns A multiphase motor has a plurality of ferromagnetically isolated stator electromagnets distributed about an axis of rotation. Successive ranges of speed during which the motor can be expected to operate are defined. A specific subset of the electromagnets is associa... | 12/28/2004 |
| 6828747 | Electric actuator and method of controlling the same The stop positions of start and end points for a slider are set by positionally adjusting a stopper and/or a stopper. The distance that the slider has traveled is learned according to a command from a control console in response to a manipulation of a learning manip... | 12/07/2004 |
| 6822411 | Method and apparatus for controlling motors Control of a motor in a device in which a mechanism is driven using the motor as the power source is achieved by providing velocity servo-control means for outputting first command information regarding the motor based upon a preset velocity profile and information ... | 11/23/2004 |
| 6696804 | Electronically commutatable motor comprising an electronic control unit An electronically commutatable motor is disclosed, whose field windings are controllable via electronic control unit using PWM control signals via semiconductor output stages, a setpoint being selectable for the control unit and the control unit outputtin... | 02/24/2004 |
| 6538412 | Method for controlling a power drive system To minimize the energy required for operation of a rail vehicle, in a drive system that has an intermediate circuit converter 1 and a three-phase motor 7 fed by it, the intermediate circuit voltage in the intermediate circuit 12 and/or the magnetic flux i... | 03/25/2003 |
| 6275348 | Magnetic tape apparatus and method A magnetic tape recording/playback apparatus, and a method of operating the apparatus, which minimises or eliminates the tape damage which is caused by the tape-driving capstan spinning and skidding across the tape at start-up. Initial acceleration of the... | 08/14/2001 |
| 6232737 | Method of detecting, diagnosing and automatically correcting abnormalities in servo control system According to the present invention, in a first acceleration after power is turned ON, currents flowing through U-phase and V-phase of a servo motor output terminal are detected, and misconnection of the motor output terminal is detected by monitoring a pa... | 05/15/2001 |
| 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 |
| 5825150 | Method of detecting, diagnosing and automatically correcting abnormalities in servo control system According to the present invention, in a first acceleration after power is turned ON, currents flowing through U-phase and V-phase of a servo motor output terminal are detected, and misconnection of the motor output terminal is detected by monitoring a pa... | 10/20/1998 |
| 5824975 | Speed control apparatus for compensating vibration of elevator A speed control apparatus for operating a cage of an elevator at a speed suitable for a required operation condition is capable of reducing a mechanical vibration generated from the cage by obtaining a torque of the winding machine from a speed-controlled... | 10/20/1998 |
| 5808429 | Method of and apparatus for controlling motor A method of controlling operation of a DC motor including the steps of detecting the level of acceleration caused by the rotation of the output shaft of the DC motor; determining the square root of the detected level of acceleration; and supplying the DC ... | 09/15/1998 |
| 5808431 | Motor rotational speed control apparatus A motor rotational speed control apparatus is constructed by a control unit for performing an instruction to accelerate a rotational speed of a motor, an instruction to decelerate, or an instruction to maintain a rotational speed, a driving unit for drivi... | 09/15/1998 |
| 5761376 | System and method of motor control A method and system are provided for controlling a motor to rapidly accelerate and synchronize with an external synchronization pulse. First, the motor is accelerated to only half of the desired speed. At this point, the phase error with the sync pulse is... | 06/02/1998 |
| 5726544 | Speed control apparatus and method for electric car A speed control apparatus and method for an electric car serving to aid driving and producing alarm signal if one of variable resistors, which are installed in an accelerator pedal, is out of order. The speed control apparatus for an electric car comprise... | 03/10/1998 |
| 5587635 | Robot control apparatus for monitoring load on robot A robot control apparatus in which a load exerted on a driving system of a robot is detected to make it easy to judge a time for preventive maintenance or overhaul, and life of the robot driving system. A driving torque Ta outputted to the driving system ... | 12/24/1996 |
| 5559408 | Apparatus for controlling a motor using piezoelectric resistance A method of controlling operation of a DC motor including the steps of detecting the level of acceleration caused by the rotation of the output shaft of the DC motor; determining the square root of the detected level of acceleration; and supplying the DC ... | 09/24/1996 |
| 5510683 | Motor speed control device A motor speed control device, preferably for use in a camera, controls a motor to rotate at a constant speed in accordance with a pulsed signal output from a motor speed detector, such as a photointerrupter. To overcome the control problems that occur whe... | 04/23/1996 |
| 4746846 | Direct current motor control, and uses to measure force, and with a physical exercise device A control device for a direct current electric motor (1) including: an external control loop, namely, a "speed loop", by means of which the speed of rotation (N) of the motor is fed back to the input of the device, as a voltage at the terminals of a tachometer... | 05/24/1988 |
| 4673852 | Device for the electric low-voltage driving of a rotatable mass having high inertia and a motor which is part of said device An electric device for driving a rotatable mass having a high inertia, said device comprising an electric motor supplied with power by a low-voltage dc source through an electronic energy converter supplying power to the armature (11) of the motor; the fi... | 06/16/1987 |
| 4656403 | Digital speed control circuit for a DC motor A speed control circuit provides control acceleration or deceleration with respect to a rate of speed or to standstill and is effected for a DC motor by way of a processor system which is provided with a speed signal proportional to the speed of the DC mo... | 04/07/1987 |
| 4648473 | Speed control for an electric golf car A speed control for an electric golf car providing sequential changing between a plurality of speeds such that the golf car must accelerate through fixed speeds for predetermined times prior to reaching a full speed. A foot pedal actuable by the operator ... | 03/10/1987 |
| 4649328 | Method for automatic speed loop tune-up in a machine drive Motor-load inertia of a drive system is determined from motor friction current and the time required to accelerate and decelerate to a predetermined speed in response to a current command. A desired response time provided by the operator is checked to det... | 03/10/1987 |
| 4549121 | Motor minimum speed start-up circuit for electric motors A minimum speed start-up circuit and method for an electric powered vehicle which ensures a minimum torque output from the motor at low vehicle speeds. The circuit includes a speed determining means for providing a signal indicative of the present speed o... | 10/22/1985 |
| 4494056 | Motor driving circuit A motor driving circuit in which the opposite ends of the motor driving coils of a video tape recorder (VTR) capstan motor are shorted by a group of switching elements when a control input voltage generated from a rotation detection/oscillator is in a pre... | 01/15/1985 |
| 4493398 | Drive control for a transportation system, especially an elevator In this drive control the regulating circuits for the rotational speed of a drive motor and of an eddy current brake are matched in their static and in their dynamic behavior so that a common regulator may be used for both regulating circuits. The matchin... | 01/15/1985 |
| 4449082 | Motor speed control system In a system for controlling within a very tight tolerance the speed of a DC motor, a first servo loop servos the motor to a speed which is close to ideal but not perfect. A second servo loop, operating in concert with the first servo loop, acts as a verni... | 05/15/1984 |
| 4430605 | Motor control system utilizing switched controller A motor control system utilizes a low cost switched controller for provding operator initiated control signals. The controller has therein a pair of switches which together define four possible modes of operation, depending upon operator manipulation of t... | 02/07/1984 |
| 4332208 | Sewing machine speed control circuit A sewing machine control circuit is disclosed in which acceleration or deceleration of the machine is effected by the operator in such a way as to gradually increase or decrease motor speed during periods of operator intervention and to maintain whatever ... | 06/01/1982 |
