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...that a workman who left the soap mixing machine on too long was responsible for making Ivory Soap? He was so embarrassed by his mistake that he threw the mess in a stream. Imagine his dismay when the evidence of his error floated to the surface! Result: Ivory soap, the soap that floats.
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| Number | Title | Issue Date |
| 8183807 | Method of driving DC motor and related circuit for avoiding reverse current A motor driving method for driving a direct-current (DC) motor, designed for avoiding a reverse current induced by the Back Electromotive Force (BEMF), includes providing a driver circuit for driving the DC motor; comparing a signal level of a terminal of the DC mot... | 05/22/2012 |
| 8179065 | Position sensorless control of permanent magnet motor Systems and methods of controlling a permanent magnet motor without a mechanical position sensor are provided. In accordance with one embodiment, a motor control system includes an inverter configured to receive direct current (DC) power and output a power waveform ... | 05/15/2012 |
| 8174221 | Motor control apparatus and control apparatus for hybrid electric vehicles To provide a motor control apparatus that uses an inverter to drive an AC motor and hybrid automotive control apparatus adapted to drive an AC motor by use of an inverter while reducing torque pulsations during switching from PWM driving to rectangular-wave driving.... | 05/08/2012 |
| 8159166 | Motor drive circuit and electric power steering apparatus A motor drive circuit includes a transistor that is connected in parallel to a first voltage divider resistance that forms a voltage divider circuit between the source and the gate of a second interrupting MOSFET. If a reverse connection of the battery occurs, a com... | 04/17/2012 |
| 8159161 | Motor control device To estimate an initial magnetic pole position, estimated control axes corresponding to the d-axis and q-axis are set as the γ-axis and δ-axis, and a with high frequency rotation voltage or alternating voltage on the γδ coordinate system applied to the motor. A h... | 04/17/2012 |
| 8154231 | Motor controller and vehicular steering system using said motor controller A low speed region position estimating portion is designed to be suitable for when the motor is operating in a low speed region, and estimates a low speed estimated rotational position θ^L. A high speed region position estimating portion is designed to b... | 04/10/2012 |
| 8148926 | Permanent magnet synchronization motor vector control device A vector control device for a permanent magnet synchronous motor drive by an inverter. The vector control device includes: a current command generation unit for generating a d-axis current command id* and q-axis current command iq* from a given torque command T*; an... | 04/03/2012 |
| 8143826 | Drive control circuit for electric motor A drive control circuit includes: an original drive signal generator generating an original drive signal based on a positional signal indicating a relative position of a first member and a second member of an electric motor; an excitation ratio signal generator gene... | 03/27/2012 |
| 8138699 | Power control system for vehicle disk motor A brushless D.C. disk motor has one or more disk rotor assemblies and pairs of stator assemblies for each rotor assembly. Each disk rotor assembly has a disk and a plurality of permanent magnets distributed along two or more circular paths in the disk inboard of the... | 03/20/2012 |
| 8093847 | Motor drive circuit, method, and disc device using the same A back electromotive force detection circuit detects a zero-crossing point by comparing a back electromotive force Vu in at least one coil of a motor with a center tap voltage at a common node of the coils, and outputs a back electromotive force detection signal. A ... | 01/10/2012 |
| 8080954 | Inverter apparatus An inverter apparatus comprises an inverter circuit using pairs of switching elements. The pseudo AC voltage of each phase of this inverter circuit is controlled by pulse modulation using pulses generated by a PWM generator, and the pseudo AC voltages are applied to... | 12/20/2011 |
| 8080957 | Motor control device and motor-driven power steering system using the same An object of the present invention is to provide a motor control device capable of suppressing voltage composite vector fluctuation to increase the output of a brushless motor, and a motor-driven power steering system using this device. The present control device ca... | 12/20/2011 |
| 8054024 | Brushless motor A brushless motor driven by a sensorless driving circuit includes a rotating body capable of being rotated about a center axis; a rotor magnet arranged coaxially with the rotating body; a stator disposed opposite the rotor magnet; and at least one coil wound around ... | 11/08/2011 |
| 8049458 | Field winding type of synchronous rotary electric machine A speed-variable field winding type of synchronous rotary electric machine is provided, where a rotor with plural-phase windings faces a rotor with a field winding. A field current is limited to flow through the field winding in one direction thereof. A fundamental ... | 11/01/2011 |
| 8044621 | Motor controller A motor controller supplies power to a motor and drives the motor, the motor including a position detector. The motor controller includes a velocity control unit which generates a torque instruction by using a velocity instruction and a velocity signal; a correction... | 10/25/2011 |
| 8004221 | Inverter system for vehicle-mounted air conditioner The present invention has an object to provide an inverter system for a vehicle-mounted air conditioner that prevents noise from entering a control circuit and allows high speed communication. A motor control microcomputer 24 is isolated from a gate circuit | 08/23/2011 |
| 8004222 | Negative sequence carrier signal controller A negative sequence feedback circuit is connected to monitor and minimize unbalances in a high-frequency ac carrier signal provided to a motor/load for the purpose of detecting rotor position. The negative sequence feedback circuit detects unbalances in the high-fre... | 08/23/2011 |
| 7969106 | Vector controller for permanent-magnet synchronous electric motor A method of controlling a current command by comparing voltage with a set value needs to vary the set value depending on voltage fluctuation, which involves taking a complicated control. A vector controller for a permanent-magnet synchronous electric motor, accordin... | 06/28/2011 |
| 7960926 | Controller for AC rotary machine A controller for an AC rotary machine, by which a stable rotation angular-frequency estimate (AFE) value can be obtained even in an extremely low speed region of the AC rotary machine is disclosed, and consequently stable control can be performed. The controller inc... | 06/14/2011 |
| 7928675 | Feedback control method and apparatus for electric motor A feedback control method and apparatus for detecting phase currents of three or more phases on fixed coordinates of a polyphase electric motor with current sensors so as to be transformed into detection currents on rotating coordinates by fixed/rotating coordinate ... | 04/19/2011 |
| 7906931 | Control of a switched reluctance machine The windings of a switched reluctance machine are supplied from a converter which is capable of providing bipolar energization. The energization pattern supplied to the windings is dependent on the number of stator and rotor poles in the machine and is selected to p... | 03/15/2011 |
| 7902778 | Programmable constant voltage retract of disk drive actuator A disk drive system including retract logic for control of the voice coil motor in a retract operation, in which the voice coil motor positions the read/write head actuator arm in a safe place in a loss-of-power event, is disclosed. The retract logic includes circui... | 03/08/2011 |
| 7902777 | Method and system for motor oscillatory state detection Method and system for motor oscillatory state detection. According to various embodiments, the present invention presents a method for determining whether a motor is in an oscillatory state. The method includes powering up a motor for a period of time and then monit... | 03/08/2011 |
| 7872438 | Initial pole position estimating apparatus and method for AC synchronous motor The present invention provides an initial pole position estimating apparatus and method for an AC synchronous motor without using magnetic pole detector. The initial pole position estimating apparatus includes a thrust force or torque pattern generating portion for ... | 01/18/2011 |
| 7868571 | Motor system with reduced common-mode noise A motor system with reduced common-mode noise includes an AC power, a first transformer unit electrically connected to the AC power and providing a first DC power, and a second transformer unit electrically connected to the AC power and providing a second DC power. ... | 01/11/2011 |
| 7852025 | Electronic commutator circuits The present invention provides an electronic commutator circuit for use with a stator winding of an electrical machine. The stator winding of the electrical machine includes a number of coils linked by the same number of points of common coupling. The electronic com... | 12/14/2010 |
| 7843155 | Direct flux regulated permanent magnet brushless motor utilizing sensorless control A permanent magnet rotor for use in a flux regulated permanent magnet brushless machine is constructed such that the inductance along the direct and quadrature axes is markedly different to provide sensorless position feedback for the rotor. ... | 11/30/2010 |
| 7808200 | Motor controller with hall sensor misalignment compensation A technique can recover from motor stalls caused by misalignment of motor position sensors such as Hall-effect sensors. In a normal operating mode, a motor controller provides motor drive current to the motor windings based on the sensor signals according to a norma... | 10/05/2010 |
| 7800325 | Brushless DC motor using linear hall-effect sensor and realization method of speed signal thereof Disclosed is a realization method of a speed signal of a motor using a linear Hall-effect sensor that may include the steps of: determining coordinate values on a x-y coordinate system using a Hall signal in the form of a sine wave of a linear Hall-effect sensor, ev... | 09/21/2010 |
| 7800336 | Control system for synchronous electric motor A control system for a synchronous electric motor controls the synchronous motor so that the phase of a current determined based on a magnetic pole position of a moving element of the motor may shift to a phase where maximum torque may be obtained. A magnetic pole p... | 09/21/2010 |
| 7795836 | Motor control device, motor control method, and program A motor control device includes: an operation amount setting unit that sets an operation amount of a motor for driving a driving target according to a predetermined driving signal; and a control unit that generates the driving signal. The control unit generates an i... | 09/14/2010 |
| 7791293 | Motor controller and electric power steering system A current sensor of a motor controller detects the current applied to a motor drive circuit and thus a phase where a failure cannot be detected would occur without taking any measures. However, an abnormal current monitor section contained in a microcomputer receive... | 09/07/2010 |
| 7786692 | Signal transmission apparatus of a DC brushless motor for a ceiling fan A signal transmission apparatus of a DC brushless motor for a ceiling fan is provided. The signal transmission apparatus comprises a transmitting line. The transmitting line is configured to transmit processed output signals of a plurality of electromagnetic sensors... | 08/31/2010 |
| 7777436 | Sensorless drive for unipolar three phase brushless DC motors A system for controlling a trapezoidally (square wave) driven DC motor includes a unipolar commutation circuit coupled between a DC power supply and a brushless DC motor. The motor has three phases formed by respective stator windings coupled at respective proximal ... | 08/17/2010 |
| 7768226 | Motor drive device and motor drive method Problems with accuracy reading position detection signal peaks and minute phase differences in the detection current make motor drive control easily susceptible to differences in motor characteristics. The rotor position is determined based on whether or not a termi... | 08/03/2010 |
| 7764030 | Control device for three-phase brushless motor A control apparatus for a three-phase brushless motor, in which a control circuit includes time interval calculation means (133 in FIG. 4). The time interval calculation means (133) is endowed with at least one time interval calculation mode. In... | 07/27/2010 |
| 7759884 | Method and arrangement for commutating an electronically commutated motor An electronically commutated motor has a permanent-magnet rotor (124) having: at least two rotor poles (183, 186, 188, 189); at least one phase (126); a power stage (122); and a rotor position sensor (140). Associated therewith is ... | 07/20/2010 |
| 7759897 | 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 p... | 07/20/2010 |
| 7746023 | Position detecting device and synchronous motor driving device using the same A position detecting device which can increase accuracy in detecting the pole position of a motor used to perform quick acceleration and deceleration over the range from a zero speed to a high rotation speed, and a synchronous motor driving device using the position... | 06/29/2010 |
| 7741799 | Brushless direct current motor driving circuit A brushless DC motor drive circuit includes a drive unit and a transient current suppression circuit. The drive unit comprises a Hall component, a drive component, a first transistor and a second transistor. The Hall component detects the position of a rotor of the ... | 06/22/2010 |
