Electricity: motive power systems inventions 11/05

20050258785 - Device and method for controlling prime mover: When an angular acceleration α of a rotating shaft of a motor connected with a drive shaft exceeds a preset threshold value αslip, which suggests the occurrence of a skid, the torque control procedure sets a maximum torque Tmax by referring to a map, which gives a smaller maximum torque...

20050258786 - Brushless dc motors with remote hall sensing and methods of making the same: A brushless DC motor apparatus includes a housing and a stator assembly coupled to the housing. The apparatus further includes a magnetic rotor assembly rotatably coupled to the housing. The magnetic rotor assembly is configured to rotate within the housing in response to electric currents through windings of the stator...

20050258789 - Method and apparatus for driving a brushless dc motor: A drive circuit for a brushless DC motor includes a switch constructed and arranged to drive the motor with a pulse signal responsive to a control signal, and control circuitry coupled to the switch and constructed and arranged to generate the control signal responsive to rotor position information from the...

20050258788 - Motor driving apparatus: A Motor driving apparatus adjusts activation start timing of high-side activation control signals UU, VU, WU and the low-side activation control signals UL, VL, and WL with a state determination signal SJ in an activation controller 40, in the period from starting to the time when rotor rotating speed reaches...

20050258787 - Pulse generating method and pulse generator, and motor control system using the same: A method of generating pulses includes setting a cycle based on a frequency of reference clock, determining a total number of the pulses to be generated during the cycle, calculating the number of one or more first reference clocks used to determine a width of one or more first pulses,...

20050258790 - Drive regenerative control system: Provided is a drive regenerative control system of a drivee with a motor superior in torque and weight balance and suitable for miniaturization as the drive source. In a drive regenerative control system having a drive source with an electric motor, a drivee, a control circuit having a drive control...

20050258791 - Electric power steering apparatus and control method of the same: In an electric power steering apparatus in which a third motor target current is determined from a first motor target current determined on the basis of a detection torque from a steering torque detection means and a second motor target current determined using at least a detection value of the...

20050258792 - Electronic control unit, electric power-assisted steering device and transmission ratio-variable steering unit: An electronic control unit for producing a sufficiently boosted voltage even when a supply voltage becomes high includes an inverter that drives switching elements and converts a DC voltage into an AC voltage, and booster means which boosts a DC voltage that is input into a voltage to lie within...

20050258793 - Apparatus for controlling power factor compensation in inverter control circuit and method thereof: The present invention provides an apparatus for controlling power factor compensation and method thereof, in which a turn-on timing point of a power factor compensation switch is delayed by a prescribed time from a zero crossing timing point to enhance a power factor. The present invention includes periodically detecting a...

20050258794 - Automatic opening/closing trash bin lid for lavatory unit of aircraft: The invention provides a device for automatically opening and closing a lid of a trash bin in noncontact fashion disposed in a lavatory unit of an aircraft. On the upper portion of a trash bin100 disposed in a lavatory unit of an aircraft is attached a lid 50 that pivots...

20050258795 - Energy management apparatus and method for injection molding systems: An energy management control apparatus for a molding machine that includes a first electrically-driven prime mover configured to drive at least a first molding machine device, and a second electrically-driven prime mover configured to drive at least a second molding machine device, includes a common DC link configured to provide...

20050258796 - Method and system for detecting the disconnection of an auxiliary power suppply from a poly-phase motor: To a neutral point of a motor is connected a positive electrode of an auxiliary battery and an auxiliary load. Voltage on a power supply line to the auxiliary load, a neutral point voltage, is detected, and disconnection of the auxiliary battery is determined when an increase of ripples in...

20050253539 - Motor control apparatus and electric appliance using the same: A microprocessor of the motor control apparatus acquires a zero-cross detection signal from a zero-cross detection section and a load current from a current detection section at a prescribed sampling period. The processor obtains a load current instant value every sampling period and a corresponding sine-functional value from a sine-functional...

20050253540 - Electric drive control device, electric drive control method, and program of same: An electric drive control device is provided with an electric machine having an asymmetrical salient pole, a current detecting portion, a phase converting device that converts the detected current into an axis current, and a current controlling device which generates a voltage command value based on the axis current and...

20050253541 - Method for measuring the rotational speed of an ec motor: A method for measuring the rotational speed of an EC motor having a primary part including a winding, and a secondary part having magnet segments offset with respect to one another in the circumferential direction and magnetized in alternatingly opposite directions, the magnet segments having tolerances regarding their positioning and/or...

20050253542 - Rotation control device of working machine: In a neutral range preset, there are set a zone for stopping and holding a rotating body only by a mechanical brake, a zone for holding the body only by performing position holding control, and a zone for simultaneously exerting both effects, i.e., the effect of the mechanical brake and...

20050253543 - Method, apparatus and article for vibration compensation in electric drivetrains: A torque current peak compensation value is subtracted from a torque current reference value, where the torque current peak compensation value is based at least in part on a determined peak of vibration. A torque current compensation value is subtracted from the results to produce an adjusted torque current reference...

20050253545 - Method of starting an electronically commutated motor: An electronically commutated motor (ECM) often employs a Hall sensor for reliable operation. Even when a Hall sensor is omitted from a motor structure, one can assure reliable startup, in a preferred rotation direction, if the motor (20) is designed with an auxiliary reluctance torque (Trel) which, when the motor...

20050253544 - System and method for controlling current in a movable barrier operator: A barrier operator comprises a current limit portion and a barrier operator portion. The current limit portion is coupled to a mains supply and the barrier operator position is coupled to the mains supply and the current limit portion. The barrier operator portion actuates a movable barrier. The current limit...

20050253546 - Method for sensorless operation of an electronically commutated motor and motor for carrying out such a method: An electronically commutated motor (ECM) often employs a Hall sensor for reliable operation. Even when a Hall sensor is omitted from a motor having a plurality of stator winding phases (24, 26) and a permanent-magnet rotor (22), one can reliably detect direction of rotation of the rotor by the steps...

20050253547 - Integrated system for controlling axes of industrial machinery: An integrated system for controlling the axes (A1, A2) of industrial machinery, in which said axes (A1, A2) are actuated by actuator means (AN, AZ, AZ1, AZ2), which apply a force so as to determine a displacement in space; at least one motor (M) and at least one transducer (T)...

20050253548 - Method of controlling a high-friction electro-mechanical servo-mechanism to minimize the power needed to hold a loaded output member: The invention provides a method for controlling an electromechanical servo-mechanism (20) for moving an output member relative to a variable load (38). The servomechanism includes: a motor (37) having at least one coil (32A, 32B or 32C) adapted to be supplied with current and having a rotor (33) with an...

20050253549 - Single-phase induction motor: A single-phase induction motor comprises a main winding, an auxiliary winding, and a capacitor, and further comprises a switch for controlling current flow in the motor to change the amount of current flowing through the motor, thereby changing the effective capacitance of the capacitor. This reduces the number of capacitors...

20050253550 - Leakage inductance saturation compensation for a slip control technique of a motor drive: An electronic drive for vector control of an induction motor controls slip and operating frequency in response to changes in stator voltage. The drive includes a torque control loop, a flux control loop and a frequency control loop. The control is based on a commanded stator current that is resolved...

20050253551 - System for powering mining equipment: Certain exemplary embodiments can include a static DC electric drive system for mining equipment. The drive system can include: an active front end adapted to receive an AC voltage and output a substantially constant DC voltage; and a DC chopper coupled to the active front end, the DC chopper adapted...

20050248301 - Reduced part count feedforward motor control: A system for controlling a motor comprising: a voltage source; a motor in operable communication with an inverter, the motor responsive to a command signal from the inverter, the inverter is in operable communication with the voltage source and a controller. The inverter includes a plurality of switching devices configured...

20050248302 - Powered remote release actuator for a seat assembly: A mechanism for a vehicle seat is includes a seat bottom supported by the vehicle and a seatback coupled to the seat bottom. The mechanism includes a first adjustment mechanism connected to the vehicle seat and operable between a locked position and an unlocked position and a first powered remote...

20050248303 - Power tool with remote stop: The present invention is directed to a power tool including a wireless remote stop for terminating the flow of electricity to an electric motor. The electric motor is configured for operating a working element assembly of a power tool, such as an arbor/circular saw blade included a table saw. In...

20050248304 - Numerical controller: A numerical controller capable of performing synchronous control of a master axis and a slave axis in different control systems at a desired ratio and with a desired relation in phase. A workpiece attached to a master axis of a first system is machined into a first gear by a...

20050248305 - Method, system, and program product for feedback control of a target system utilizing imposition of a periodic modulating signal onto a command signal: Feedback control of a target system is provided which utilizes the imposition of a periodic modulating signal onto a command signal of a controller. The command signal with the period modulating signal imposed thereon is input to the target system to be controlled. A response of the target system to...

20050248306 - Permanent magnet synchronous motor and controller therefor: A low-cost sine-wave drive for a 3-phase permanent magnet synchronous AC machines (PMSM) in open-loop control is based on the measurements of two linear Hall sensors. The two Hall sensors are excited by a magnetic ring with the same pole number as the PMSM rotor magnet and sinusoidal flux distributions....

20050248307 - Method for controlling induction motor: In a method for controlling an induction motor 14, in which the speed of the induction motor 14 is controlled, by an inverter 21, to move and stop an actuator 22 at a predetermined position, a speed command 23 to be input to the inverter 21 is switched to an...

20050248308 - Apparatus and method for ride through for ac induction motors: A method and an apparatus for controlling ride through of an induction motor by detecting a power loss from a power supply connected to the induction motor, disconnecting the induction motor from the power supply, monitoring a line voltage of the power supply, monitoring a back emf voltage generated by...

20050242757 - Method, system and program product for controlling a single phase motor: A controller is provided for transitioning a drive signal to a single phase motor between a square wave and pulse width modulation modes, wherein the drive signal is in square wave mode at low motor frequencies and in pulse width modulation mode during normal operation. The transitioning includes using a...

20050242758 - Mesh connected brake array for electrical rotating machines: In the present invention, several polyphase devices are connected together: an inverter (420), and electrical rotating machine (440), and a resistive load or braking resistor (430). The purpose of the resistive load is to dissipate excess electrical power which may be produced when the inverter acts to slow down the...

20050242759 - Ac rotating electric machine control method and electrical power train system: Solving Means: A field coil current and a stator current are controlled by a controller. The stator current is controlled under vector control and is controlled so that the phase keeps an efficient motor zone. In a case of rated power generation, when the motor speed is low, the phase...

20050242760 - Motor temperature estimator and motor controller: A motor-current square value calculation section 45 calculates, as a motor-current square value, the sum of respective square values of two phase currents converted from three phase currents flowing through an electric motor. A temperature estimation calculation section 44 performs low-pass filtering for the motor-current square value, and calculates temperature...

20050242761 - Driving circuit for a dc brushless fan motor: The present invention is a driving circuit for a DC brushless fan motor, comprising a control unit, a motor, a Hall element, a signal output unit, a temperature control circuit, a reverse protection circuit and a counter-electromotive force (CEMF) removal circuit, as tied in with a plurality of resistors, capacitors,...

20050242762 - Method for operating a wiper system, and corresponding wiper system: The invention relates to a method for operating a wiper system, especially an opposed wiper system or a butterfly wiper system, and to a wiper system comprising at least two motor units which are coupled to wiper blades and can be independently driven, a control appliance for controlling the motor...

20050242763 - Method of operating a roller blind actuator and device for the implementation thereof: The method of operating an actuator comprising a motor and an electronic unit controlling the electrical power supply to the motor to provoke the movement of the actuator in a first direction or in a second direction, the actuator being linked to a control module acting on the electronic unit...

20050242764 - Positioning apparatus, exposure apparatus, and semiconductor device manufacturing method: A positioning apparatus includes an X stage, a linear motor (X-axis) which drives the X stage along the X-axis, a linear motor (Y-axis) which drives a Y stage along the Y-axis, a laser interferometer which detects position information of the stages along the X and Y directions, and a controller...

20050242765 - Motor drive apparatus and electric power steering apparatus: The present invention provides a motor drive apparatus capable of calculating an angular velocity and a rotation angle accurately in the entire rotation velocity range of a motor using a cheap Hall sensor having an inferior accuracy without using an expensive resolver having a high accuracy. The present invention includes...

20050242766 - Control apparatus for rotating machine: In a control apparatus for a rotating machine, an integration unit integrates a primary angular frequency based on an angular velocity command and computes phase, a power converting unit applies three-phase voltages to the rotating machine according to three-phase voltage commands, a current detecting unit detects three-phase currents flowing through...

20050242767 - System and method for elimination of dc offset feedback in ac drives: A DC offset compensation system and method significantly reduce a DC offset voltage in the voltage feedback loop of an AC motor drive control system. A control voltage error signal is demodulated and filtered and applied to the closed loop voltage feedback signals to compensate for DC offset voltages in...