Electricity: motive power systems inventions 07/08

20080180045 - Elimination of unintended velocity reversals in s-curve velocity profiles: A method is employed to eliminate undesired velocity reversal in a motion profile. A start speed, a start acceleration, a speed limit, an acceleration limit, a deceleration limit, an acceleration jerk limit, and a deceleration jerk limit are programmed for the motion profile. A critical jerk value needed to avoid... Agent: Rockwell Automation, Inc./fay

20080180046 - Method and device for estimating the angular position of the rotor of a brushless motor: A method is for estimating an angular position of a rotor of a motor having position sensors along the circumference of a stator and generating digital signals that switch each time the rotor crosses certain angular positions. The method includes storing rotor angular positions at every digital signal switching, and... Agent: Allen, Dyer, Doppelt, Milbrath & Gilchrist P.A.

20080180047 - Pair pole asymmetry compensation in back electromotive force zero cross detection: Disk drive spindle jitter is comprised of electrical noise, error due to pair pole asymmetry, and random disk speed variances. Error caused by pair pole asymmetry can be identified and compensated for by detecting over a single rotation of a rotor a plurality of zero cross signals. These signals can... Agent: Stmicroelectronics, Inc.

20080180048 - Bldc motor with a simulated tapped winding interface: A brushless direct current (BLDC) motor having a simulated tapped-winding input. The BLDC motor includes a stator/rotor assembly having a stator and a rotor. The BLDC motor has a common input and a plurality of power inputs. Each power input corresponds to an operating parameter. The BLDC motor receives an... Agent: Michael Best & Friedrich LLP

20080180049 - Low noise and energy saving air vacuum cleaner: A low noise and energy saving air vacuum cleaner by detecting the operation status of the cleaner to control the size of the electricity inputted to an air pump drive motor, or exercise the control of power delivery or power cut off; normal rated voltage being inputted when the cleaner... Agent: Bacon & Thomas

20080180050 - Movable barrier operator auto-force setting method and apparatus: A movable barrier operator having a motor controller (10) and motor (11) that control selective movement of a movable barrier (12) also has an obstacle detector (14) that utilizes an automatically determined excess force threshold value to permit reliable detection of an obstacle under a wide variety of operational circumstances,... Agent: Fitch Even Tabin And Flannery

20080180051 - Numerical controller and synchronous control method using numerical controller: A conveyer 1 for transporting a box and a conveyer 2 for transporting a bottle are driven along a follow-up target axis and a follow-up axis respectively. The follow-up axis is accelerated from a synchronization start position, and when the follow-up axis velocity catches up with the conveyer 1, the... Agent: Drinker Biddle & Reath (dc)

20080180052 - Control apparatus of servo motor: The control apparatus 10 of a servo motor of the present invention has a position control unit 11 controlling the position of a servo motor 33, a speed control unit 12 controlling a speed of the servo motor 33, a distributing unit 13 dividing the speed command output by the... Agent: Drinker Biddle & Reath (dc)

20080180053 - Positioning device having dynamically isolated frame, and lithographic device provided with such a positioning device: A positioning device includes an object table, a sub-system for processing an object to be placed on the object table, a drive unit for displacing the object table relative to the sub-system, and a measuring system for measuring a position of the object table relative to the sub-system. The drive... Agent: Oliff & Berridge, PLC

20080180054 - Control apparatus for ac rotary machine and method for measuring electrical constant of ac rotary machine using the control apparatus: A control apparatus for an AC rotary machine, including first voltage command calculation means for calculating first voltage commands from current commands, an angular frequency, and constant set values of the AC rotary machine, second voltage command calculation means for calculating second voltage commands on the basis of difference currents... Agent: Oblon, Spivak, Mcclelland Maier & Neustadt, P.C.

20080180056 - Phase current detection method, inverter control method, motor control method and apparatus for carrying out these methods: Apparatus and methods for phase current detection used for driving a motor by supplying outputs from a pulse width modulation (PWM) converter to the motor. One method presented provides detecting a DC link current and a vector pattern, determining whether a voltage vector lengths exceeds a predetermined value, and adjusting... Agent: Birch Stewart Kolasch & Birch

20080180055 - Systems and methods for improved motor drive power factor control: Systems and methods are described for controlling power factor in motor drives having a switching rectifier providing a DC link current to an inverter in which the rectifier gain is increased to provide additional DC link current to correct the drive power factor based on current drawn by capacitors of... Agent: Rockwell Automation, Inc./fay

20080174255 - Common mode & differential mode filter for variable speed drive: Systems and methods for improved Variable Speed Drives having active inverters include an input filter for filtering common mode and differential mode currents. A three-phase inductor has three windings, each winding of the three-phase inductor having a center tap dividing each winding into a pair of inductor sections; and a... Agent: Mcnees Wallace & Nurick Llc

20080174256 - Reversing circuit for ice delivery system: The present invention comprises a gear motor assembly and control system for use with ice crushers and the other similar devices. The assembly utilizes a novel reversing circuit which allows the use of a bidirectional DC powered gear motor in existing refrigerator and freezer configurations, which heretofore used AC powered... Agent: Sonnenschein Nath & Rosenthal LLP

20080174257 - Variable speed drive with integral bypass contactor: Systems and methods for operating a variable speed drive to receive an input AC power at a fixed AC input voltage and frequency and provide an output AC power at a variable voltage and variable frequency. The variable speed drive includes a converter stage to convert the input AC voltage... Agent: Mcnees Wallace & Nurick Llc

20080174258 - System and method to extend synchronous operation of an active converter in a variable speed drive: Systems and methods for synchronous operation of variable speed drives having active converters include extending the synchronous operation of an active converter to the AC mains voltage during complete line dropout. A phase angle control circuit includes a squaring amplifier, a first phase-lock loop circuit associated and a second phase-lock... Agent: Mcnees Wallace & Nurick Llc

20080174259 - Device for generating analog current or voltage signal: In a device, such as measuring or control signal transmitter, generating an analog current or voltage output signal, absolute values of output variables are continuously measured and regulated to ensure the correctness of the signal. The actual current or voltage value of an analog output signal is measured and digitized... Agent: Buchanan, Ingersoll & Rooney Pc

20080174260 - Method and related device for estimating two currents flowing simultaneously through respective windings of a poly-phase electrical load driven in svm mode: A method for estimating values assumed at a certain instant of each period by currents flowing respectively in two distinct windings of a poly-phase load controlled in a space vector modulation (SVM) mode, using a same measuring device, may include coupling the measuring device to the first winding and measuring... Agent: Allen, Dyer, Doppelt, Milbrath & Gilchrist P.a.

20080174262 - Method of powering a single-phase electric motor and a power supply system for implementing such a method: The present invention relates to a method of powering a single-phase asynchronous electric motor, comprising first and second windings, in which method one of the windings is powered by AC mains while the other winding is powered by an inverter that receives a rectified voltage from the mains and that... Agent: Oliff & Berridge, Plc

20080174261 - Power capacitors for ac motors mounted diametrically on associated transmissions: Power capacitors for AC motors are mounted diametrically on associated transmissions. The power capacitors are in one embodiment annular and in another embodiment, arcuate. By having power capacitors mounted on transmission housings diametrically, cooling of the power capacitors is facilitated for both air and liquid cooling.... Agent: General Motors Corporation Legal Staff

20080169775 - Control apparatus for electric car: A control apparatus for an electric car, including a power converter which feeds AC power of variable voltage and variable frequency to a primary side member of a linear electromagnetic actuator, voltage command means for giving a command of a voltage which is fed to the linear electromagnetic actuator, current... Agent: Buchanan, Ingersoll & Rooney PC

20080169774 - Integrated linear motor: The present invention provides an integrated linear motor, which comprises a linear stage and a controller coupled to the linear stage, wherein the linear stage comprises a Hall sensor, an encoder, and a linear motor integrated thereon and the controller comprises a microprocessor, an amplifier, and a power supply integrated... Agent: Charles E. Baxley, Esq.

20080169776 - Power supply device for an electric motor method for operation of an electric motor: A power supply device for an electric motor, operated either in a normal operating mode and/or an emergency operating mode, in particular, for an actuator in a motor vehicle and a method for operation of an electric motor in a normal operating mode and/or an emergency operating mode, in particular,... Agent: Volpe And Koenig, P.C.

20080169777 - System and method for adjusting a dead-time interval in a motor control circuit: A system and a method for adjusting a dead-time interval between de-activating a first transistor and activating a second transistor in a motor control circuit are provided. The method includes determining a plurality of commanded torque values associated with a motor based on a received signal over time. The method... Agent: Cantor Colburn, LLP

20080169778 - Axis-of-rotation position control device: When performing numerical control of a rotary table, the moment of inertia and the center of gravity of a control target change because of a placed object fixed onto the rotary table. A rotary table to which a placed object has been fixed serves as a target plant, the actual... Agent: Osha Liang L.L.P.

20080169779 - Modular trolling motor control system: A trolling motor control system includes plurality of modules that are connected to a communication bus to transmit and receive data used in controlling operation of a trolling motor. Based upon data transmitted over the bus, trolling motor speed, steering, and trim can be controlled. The modules can include motor... Agent: Kinney & Lange, P.A.

20080169780 - Method and device for determining the duty-cycles of pwm control signals of an inverter: A method for determining duty-cycles of respective pulse width modulated (PWM), space vector modulated (SVM) control signals of an inverter, may include storing values of the duty-cycles as a function of a position of the multi-phase electric load in a look-up table. The method also may include determining a phasor... Agent: Allen, Dyer, Doppelt, Milbrath & Gilchrist P.A.

20080169781 - Active damping device for a positioning stage: A damping apparatus is provided for a positioning stage that is operative to move and position an object along a motion axis. The damping apparatus comprises a motion transformation device operative to rotate the positioning stage about a rotary axis that is substantially perpendicular to the motion axis, in response... Agent: Ostrolenk Faber Gerb & Soffen

20080169782 - Method for sensorless estimation of rotor speed and position of a permanent magnet synchronous machine: A method for sensorless estimation of rotor speed and position of a permanent magnet synchronous machine, when the permanent magnet synchronous machine is fed with a frequency converter, the method comprising the steps of forming a stator voltage reference for the permanent magnet synchronous machine, injecting a high frequency signal... Agent: Buchanan, Ingersoll & Rooney PC

20080169783 - Induction motor controller: The present invention provides an induction motor controller which includes: a circuit for generating a d-axis current reference signal from a d-axis current command value and a periodically varying periodic signal; a d-axis current controller for controlling a d-axis motor current flowing through an induction motor to be controlled to... Agent: Antonelli, Terry, Stout & Kraus, LLP

20080164830 - Synchronous linear motor with non-contacting scanning of the toothed structure of the secondary part: The aim of the invention is the equipping of a synchronous linear motor with a non-permanently-magnetic secondary part with a simple positional measuring system. Said aim is achieved, whereby the tooth structure of the toothed rack-shaped non-permanently-magnetic secondary part (S) varies with position in the direction of movement (B). Furthermore,... Agent: Henry M Feiereisen, LLC

20080164831 - Modular soft starter: Modular soft starters are disclosed having a plurality of soft starter modules with stacked SCRs and heat sinks for accommodating a single phase of a three phase motor, where the modules may be connected serially for starting each phase of a higher voltage motor, and where the modules can be... Agent: Rockwell Automation, Inc./fay

20080164832 - Rotation control device and construction machine: To rotate a rotary body at a constant velocity, a swing control device 50 of an electric rotary excavator controls the rotation of the rotary body with a small first torque command value T1. Thus, when inertia moment of the rotary body is changed due to extension or retraction of... Agent: Frishauf, Holtz, Goodman & Chick, PC

20080164833 - Disc apparatus: A disc apparatus (1) includes a spindle motor (3) which rotates a disc (2), a differential operational amplifier (5) which detects a difference between voltages of a positive terminal and a negative terminal of the spindle motor (3) as a detecting voltage level, a failure judgment unit (10) which judges... Agent: Crowell & Moring LLP Intellectual Property Group

20080164834 - Device and method for controlling machine tool: A device for controlling a feed motion of a feed control axis and a rotary motion of a rotary control axis, both axes being provided in a machine tool so that the rotary control axis is fed along the feed control axis. The device includes an interference estimating section estimating... Agent: Drinker Biddle & Reath (dc)

20080164835 - Stepping motor controller and stepping motor control program: A stepping motor controller for controlling a stepping motor which drives a load, including: a load drive state detection section which detects a driving state of the load; and a control section which controls the stepping motor, when a detection result of the load drive state detection section is beyond... Agent: Cantor Colburn, LLP

20080164836 - Static frequency converter with automatic function for optimizing magnetic flux and minimizing losses in electric induction motors: “STATIC FREQUENCY CONVERTER WITH AUTOMATIC FUNCTION FOR OPTIMIZING MAGNETIC FLUX AND MINIMIZING LOSSES IN ELECTRIC INDUCTION MOTORS”, having an automatic function for regulating and controlling magnetic flux in the motor in function of the motor's operating frequency, such that the motor operates with ideal magnetic flux and consequently with less... Agent: Cantor Colburn, LLP

20080157702 - Electric motor with a retractable shaft: An electric motor (100) for controlling the lateral displacement of a shaft (114) connected to a rotor (104) of the electric motor (100) is provided. The electric motor (100) includes one or more stator conductors (106) for carrying a current and one or more permanent magnets (108) to produce a... Agent: Motorola Inc

20080157703 - Synchronous reluctance machines: The present invention provides an electro-mechanical energy exchange system with a variable speed synchronous reluctance motor-generator having an all-metal rotor. A bi-directional AC-to-DC electric power converter interconnects the motor-generator with a DC bus. First and second hybrid controllers provide current regulation for the motor-generator and voltage regulation for the DC... Agent: Jackson, Demarco, Tidus & Packenpaugh

20080157704 - Raindrop detecting device and method of selecting wiping mode for vehicle: A raindrop detecting device for detecting a raindrop amount on a windshield of a vehicle and selecting a wiping mode of a wiper based on the detected raindrop amount includes a controller for lowering the wiping mode when the detected raindrop amount is kept to be smaller than a mode-keep... Agent: Nixon & Vanderhye, Pc

20080157705 - Magnetic absolute encoder: In the magnetic absolute encoder, an ordinary operating circuit and an ordinary/backup operating circuit are actuated during ordinary operation in which power is supplied from the ordinary operating power supply; the single-rotation absolute value (1) and single-rotation absolute value (2) detected by these circuits are compared by the abnormality diagnosis... Agent: Buchanan, Ingersoll & Rooney Pc

20080157706 - Method for controlling a heat engine vehicle driving assembly: The invention concerns a method for controlling a vehicle driving assembly which consists in applying to a variable reluctance machine (6) a conduction angle setpoint value (??p), in regulating said conduction angle setpoint value (?p) using an additional angle conduction (??p) determined on the basis of a torque control measurement... Agent: Oblon, Spivak, Mcclelland Maier & Neustadt, P.c.

20080157707 - Electric motor and method of controllling said motor: The invention relates to a sensorless electric motor and a method of controlling such an electric motor, which motor comprises a permanently magnetic rotor, a stator having at least one winding, and a power stage for influencing the current flowing through the winding. As a function of a predetermined commutation... Agent: Ware Fressola Van Der Sluys & Adolphson, LLP

20080157708 - Method and apparatus for determination of the rotor position of an electric motor: The invention relates to a method for determining the angular position (theta) of a rotor (2) pertaining to an electric motor (1) and comprising a number of pairs of poles. Said method consists of the following steps: a pulse pattern (PM1, PM2, PM3) with a pulse duration (T) flows through... Agent: Henry M Feiereisen, Llc

20080157710 - Beat-less controller for permanent magnet motor: In a driving system for an inverter that uses a diode rectifying circuit to convert a single-phase or three-phase AC voltage to a desired DC voltage and drives a permanent magnet motor, a DC-voltage pulsating frequency is estimated from a pulsating frequency setting calculated from the power supply frequency of... Agent: Antonelli, Terry, Stout & Kraus, LLP

20080157709 - Highly responsive permanent magent motor controller: Current command values are used instead of detected current values to estimate axis error by calculation. An axis error command value is generated according to a speed command value, and a difference between the generated axis error command value and the estimated axis error value is used to control an... Agent: Antonelli, Terry, Stout & Kraus, LLP