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An aircraft having vertical takeoff and landing capability provided with at least first and second laterally extending paddle wheels rotatable on a central axis perpendicular to the longitudinal axis of the aircraft fuselage and between its nose and tail.
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| Number | Title | Issue Date |
| 8148934 | Voltage step-up/down converter A motor control apparatus includes a step-up/down converter and an inverter. The converter includes a coil, MOSFETs, capacitors and a control circuit. The control circuit turns on the MOSFET in the high potential side, while tuning off the MOSFET in the low potentia... | 04/03/2012 |
| 8115442 | Electric motor drive system and electric motor control method An electric motor drive system having current detecting sections for detecting the currents flowing into electric motors, speed variation calculating sections for calculating the speed variation estimating values for the electric motors in accordance with the motor ... | 02/14/2012 |
| 8115441 | On-line measurement of an induction machine's rotor time constant by small signal d-axis current injection A controller continually updates rotor time constant estimation of an induction machine by interrogating the induction machine with a small signal oscillation and monitoring the response. The small signal oscillation is injected onto the d-axis current command signa... | 02/14/2012 |
| 8102140 | Method and apparatus for estimating induction motor electrical parameters A method and apparatus to provide estimates of electrical parameters for line-connected induction motors during either steady-state or dynamic motor operations. The electrical parameters are calculated from the motor nameplate data and voltage and current measuremen... | 01/24/2012 |
| 8035325 | Single-phase brushless motor The single-phase brushless motor according to one aspect of the present invention includes a coil array having a plurality of magnetic coils 11-14; a magnet array having a plurality of permanent magnets 31-34; a magnetic sensor 40 ... | 10/11/2011 |
| 7948201 | Induction motor control device An induction motor control device includes an inverter circuit for driving an induction motor by outputting a command voltage, a current detector for detecting an output current, a magnetic flux estimation observer for generating an estimated magnetic flux, an estim... | 05/24/2011 |
| 7936145 | Electronically commutated asynchronous motor An electronically commutated asynchronous motor (12) features a stator (202), a short-circuit rotor (204), a controller (FOR 20) for field-oriented regulation of the motor (12), a sensor magnet (274) in thermally conductive ... | 05/03/2011 |
| 7932691 | Permanent magnet motor start-up Methods and apparatus are provided for startup of a permanent magnet alternating current (AC) motor. The method comprises the steps of detecting startup of the permanent magnet AC motor; detecting a mechanical oscillation of the permanent magnet AC motor when startu... | 04/26/2011 |
| 7932685 | Control apparatus for power conversion apparatus and power conversion system The control apparatus for a power conversion apparatus having chopper circuits and a capacitor, each of which includes a switching circuit and a coil, the switching circuit being on/off-controlled in accordance with specific timings determined in accordance with a c... | 04/26/2011 |
| 7839114 | Phase detection method, phase detecting apparatus, synchronous-motor control method, and synchronous motor controller It is determined which of six continuous sections having different magnitude correlation of signal amplitude of each phase of an input three-phase signal a section is. Predetermined subtraction is performed between respective phases in the section, to obtain a norma... | 11/23/2010 |
| 7816876 | Motor control device and motor drive system Let an axis parallel to a magnetic flux produced by a permanent magnet provided on a rotor of a motor be called a d-axis, let an axis leading the d-axis by an electrical angle of 90 degrees be called a q-axis, and let control axes corresponding to the d-axis and the... | 10/19/2010 |
| 7791294 | Starting control apparatus and method for motor An exciting coil of a motor is formed to be controlled by using an analog timer, to thus control an excitation control circuit of a motor control apparatus, whereby an excitation control circuit which excites the exciting coil of a motor control apparatus can be sim... | 09/07/2010 |
| 7772789 | Motor controller The motor controller drives an electric motor including a rotor as a field magnet and stator coils of U-phase, V-phase and W-phase. The motor controller includes an exploration voltage application unit for applying an exploration voltage to the stator coils of U-pha... | 08/10/2010 |
| 7642737 | Anti-windup control for a current regulator of a pulse width modulation inverter A control architecture for an electrical inverter includes a command limiter that is realized as a circular voltage limiter. The command limiter includes a Cartesian-to-polar converter coupled to a command source such as a synchronous frame current regulator. The Ca... | 01/05/2010 |
| 7498761 | Motor control method and motor control apparatus A motor control apparatus 1 that controls a rotation speed of a motor driven according to a speed command includes an abnormal-rotation detector 21 which determines that the motor is in an abnormal-rotation state, such as a runaway, when a speed deviat... | 03/03/2009 |
| 7463005 | Method and device for sensorless vector control for AC motor A control method and a controller for an a.c. motor without using a speed sensor in which the speed estimated value or the magnetic flux estimated value of an all-dimensional magnetic flux speed observer can be made to correspond to that of an actual a.c. motor.... | 12/09/2008 |
| 7456600 | Pulse code width modulation motor drive system A detailed architectural and operational characteristic of a pulse code width modulation (PCWM) motor drive system is presented. The system can drive a three phase permanent magnet AC (PMAC) motor sinusoidally without sensing its rotor position. The system employs a... | 11/25/2008 |
| 7443116 | Electrically powered vehicle mounting electric motor and control method therefor A normal map determines a carrier frequency used for switching control of an inverter controlling driving of a motor generator, in accordance with the state of operation of the motor generator in a normal operation. In a stall state in which the driver is pressing b... | 10/28/2008 |
| 7443128 | Method and device for controlling motors An electronic device is provided for controlling a motor having three phases driven by a motor driver. In one implementation, the electronic device includes a detection means and a control circuit. The detection means includes three high-gain differential amplifiers... | 10/28/2008 |
| 7436144 | Inverter apparatus A CPU calculates, based on a frequency command value for driving a motor and on a state quantity of the motor, an output-voltage command value in which only the phase advances while amplitude is constant in each calculation period, without reducing the calculation p... | 10/14/2008 |
| 7423405 | Electromagnetic rotating machine In order to obtain an electromagnetic rotating machine of lightweight and high energy efficiency, which produces big torque for rotating a large-diameter fan, a coil A and coil B as excitation coils are disposed on an inner peripheral surface of a fan casing so as t... | 09/09/2008 |
| 7411363 | Conservation of electrical energy and electro-magnetic power in motor, generator, and product components A capacitor, inductor, and power line are arranged in a series parallel combination tank circuit that operates over four quarters of a complete cycle. During the first quarter cycle: power is applied to the tank circuit, current flows through the inductor to the cap... | 08/12/2008 |
| 7408322 | Device for determining constant of rotating machine A device for determining a constant of a rotating machine includes: a test number selector outputting a test number n, selected from 1 to N (N≧2), and outputting a phase signal q determined by a predetermined condition that is previously set based on the test numb... | 08/05/2008 |
| 7407137 | Dual voltage integrated power and attitude control system and method An integrated power and attitude control system and method for a vehicle efficiently supplies electrical power to both low voltage and high voltage loads, and does not rely on relatively heavy batteries to supply power during the vehicle initialization process. The ... | 08/05/2008 |
| 7402975 | Motor drive device and drive method A rise in the power supply voltage as a result of a sudden speed reducing command causing the motor current to flow to the power supply is prevented. The motor drive device has a drive signal generating unit for generating a drive signal by an energizing control uni... | 07/22/2008 |
| 7385371 | Vector controller for induction motor A vector controller of an induction motor capable of correcting the set value of mutual inductance so as to match it to an actual value by additional processing on software without adding any special device. The vector controller (1) of an induction motor com... | 06/10/2008 |
| 7378816 | System and method for confirming a detection of low voltage and shorted SCRs A motor controller system includes solid state switches for connection between an AC line and motor terminals for controlling application of AC power to a motor. Voltage sensors sense voltage across each of the solid state switches and AC line voltage. A control cir... | 05/27/2008 |
| 7375485 | Control systems and methods for starting permanent magnet rotating machines Systems and methods for controlling a rotating electromagnetic machine. The rotating machine, such as a permanent magnet motor or hybrid switched reluctance motor, includes a stator having a plurality of phase windings and a rotor that rotates relative to the stator... | 05/20/2008 |
| 7375489 | Apparatus for generating sine waves of electromotive force, rotary switch using the apparatus, and generators using the rotary switch An apparatus generates sine waves of electromotive force (i.e. alternating current) from a battery. The battery includes a given number of cells connected in series. A stator and commutator is formed by a multiple of segments. Each of the segments is connected in se... | 05/20/2008 |
| 7375934 | Power converter controlling apparatus and method applying a fault protection scheme in a motor drive system A method and apparatus control a power converter (20) of a motor drive system. The power converter (20) is controlled during a first operating mode by applying a current control scheme, which sets power converter commands to control active and reactive... | 05/20/2008 |
| 7368890 | Power converter with active discharging for improved auto-restart capability A method of operating a power converter in response to an interruption in an input power being provided to the power converter, as well as a power converter capable of performing such method and including a rectifier and an inverter coupled at least indirectly with ... | 05/06/2008 |
| 7366599 | Electric power steering apparatus An electric power steering apparatus that performs steering assist by transmitting a driving force produced by an electric motor to a steering mechanism. The apparatus is provided with a current detection circuit for detecting a current flowing through the electric ... | 04/29/2008 |
| RE40250 | Pulse width modulation circuit controlling output current of an inverter circuit for motor-driven blower or electric vacuum cleaner The present invention provides a PWM control device wherein a microprocessor detects the rotational position of rotor of a brushless motor with respect to the amount of each current supplied from an inverter circuit for driving the brushless motor to the brushless m... | 04/22/2008 |
| 7358699 | Rotating electric machine with built-in control device The invention is intended to obtain a rotating electric machine with a built-in control device in which the control device is kept from receiving heat from a main body of the rotating electric machine and the control device can be cooled in a desirable fashion. A he... | 04/15/2008 |
| 7358700 | Induction motor controller An induction motor controller that may include three phase paths leading from a power input to a power output, a solid-state switching device interposed between the power input and the power output on each of the three phase paths, a voltage sensor coupled to two of... | 04/15/2008 |
| 7358694 | Apparatus and method for determining normal start up of sensorless motor An apparatus and method determine a start-up of a sensorless motor. The apparatus includes an elapsed time determination unit, a motor velocity determination unit and an abnormal start-up determination unit. The elapsed time determination unit determines whether a p... | 04/15/2008 |
| 7355436 | Method for error detection in a drive mechanism A method for error detection in a drive mechanism, having a multiphase electric motor and a converter connected upstream thereof, wherein the converter controls voltages of individual phases of the electric motor, and individual phase currents in the individual phas... | 04/08/2008 |
| 7352188 | Electrically operated vehicle abnormality judging device An electrically operated vehicle abnormality judging device. The invention has an electrically operated machine, a driving signal generation processing section for generating a driving signal by receiving a command value, an inverter for receiving the driving signal... | 04/01/2008 |
| 7348751 | Apparatus for deciding position of traction A hauling unit hauls a subject to bend or rotate the subject. A control unit outputs a control signal that corresponds to a target value that is input by an operating unit. The control unit controls a variation amount of the control signal output in a predetermined ... | 03/25/2008 |
| 7348740 | Motor control circuit for forward/reverse rotation A motor control circuit for forward/reverse rotation comprises a driving circuit, a switching circuit and a motor coil winding. The driving circuit has a driving source, a Hall IC and a driving IC. The driving source provides a signal to enable the Hall IC to output... | 03/25/2008 |
