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| Number | Title | Issue Date |
| 7514896 | Method of estimating magnetic pole position in synchronous motor In a method of estimating a magnetic pole position in a synchronous motor, an alternating current voltage having α- and β-axes components in an αβ coordinates system representing a two-phase alternating current coordinates system is applied to the motor, and α-... | 04/07/2009 |
| 7440261 | Power regulator with a bypass and splice capability A power regulator with a bypass and splice capacity includes at least one phase member and a driver. Each one of the at least one phase member includes two cooling fins, two SCR thyristors, a conductive resilient tab and a conductive rigid tab. The cooling fins are ... | 10/21/2008 |
| 7342378 | System and method for driving synchronous motor A driving apparatus of a synchronous motor fixes all the switching devices of an inverter at OFF in accordance with a value of an all-OFF control pulse signal outputted by a pulse generator. A motor current keeps flowing through free wheel diodes for a predetermined... | 03/11/2008 |
| 7329960 | System and method for propelling a large land-based vehicle using a dual function brushless dynamoelectric machine A propulsion system for a relatively large land-based vehicle, such as a locomotive or off-highway vehicle, is provided. The system may include a brushless dynamoelectric machine made up of a main alternator having a main rotor and a main stator, and an auxiliary al... | 02/12/2008 |
| 7312594 | Control system for synchronous machine A control system for a synchronous machine including a converter for converting DC voltage to AC voltage or AC voltage to DC voltage. The synchronous machine is driven by the converter. The control system further includes a magnetic pole position presuming device fo... | 12/25/2007 |
| 7301311 | Brushless starter-generator with independently controllable exciter field A starter-generator system supplies a controllable torque to a gas turbine engine, to thereby assist in starting the gas turbine engine, by independently controlling excitation frequency and/or voltage magnitude. The starter-generator includes a multi-phase exciter ... | 11/27/2007 |
| 7271565 | Apparatus for controlling speed of fan motor of air-conditioner An apparatus for controlling a speed of a fan motor (HIM (Hybrid Induction Motor)) of an air-conditioner extends a speed control range of a fan motor of an air-conditioner by controlling revolutions per minute (RPM) of the fan motor. In order to extend the speed con... | 09/18/2007 |
| 7235947 | Synchronous motor control method and synchronous motor control system A desired q-axis current is determined based on a desired torque, and a desired d-axis current is determined based on the rotating speed of a synchronous motor when the terminal voltage of the synchronous motor coincides with a predetermined maximum permissible volt... | 06/26/2007 |
| 7199549 | Feedback parameter estimation for electric machines A method and system for estimating a parameter of an electric machine, including a controller and a switching device, the controller executes a parameter estimation process, which is responsive to at least one of: a current value and a torque command and the resulta... | 04/03/2007 |
| 7188701 | Velocity compensation control for electric steering systems Disclosed herein is a method as well as a system for controlling an electric power steering system. The method includes: receiving a torque signal from a torque sensor responsive to a torque applied to a handwheel; obtaining a motor velocity signal, the motor veloci... | 03/13/2007 |
| 7157878 | Transient compensation voltage estimation for feedforward sinusoidal brushless motor control A method for controlling a voltage mode controlled electric machine comprising: receiving a torque value representative of a desired torque; obtaining a speed value indicative of a rotational velocity of the electric machine; acquiring a phase advance value indicati... | 01/02/2007 |
| 7122994 | Control apparatus for a starter/generator system A control apparatus (202) for a starter/generator (110) of an aircraft electrical power system is provided. During a start mode of operation, AC power is provided by the control apparatus (202) to an exciter stator (114) of the starter/ge... | 10/17/2006 |
| 7116073 | Methods and apparatus for controlling a motor/generator Methods and apparatus provide for: commutating windings of a polyphase machine such that electromagnetic fields of stator and rotor phases of the polyphase machine produce at least one of motoring and generating torque; providing a first rotor excitation voltage hav... | 10/03/2006 |
| 7102319 | Synchronous motor and a rotation control method thereof, as well as, an inverter for use of the synchronous motor A rotation control method of a synchronous motor, the motor comprising: a stator having AC windings thereround; and a rotor, being mounted within said stator, rotatably, wherein on an each surface, opposing to the rotor, of poles building up the stator, are formed p... | 09/05/2006 |
| 7081735 | System and method for bypassing a motor drive A motor control system comprising a plurality of motor controllers and a power source adapted to drive an electric motor. The motor control system comprises a switch that is selectively operable between at least a first position and a second position. In the first p... | 07/25/2006 |
| 7071649 | Active temperature estimation for electric machines A method and system for estimating a temperature of an electric machine comprising obtaining a temperature value responsive to a temperature signal from a temperature sensor, the temperature sensor is operatively connected to and transmitting the temperature signal ... | 07/04/2006 |
| 7030583 | Method for the commutation of brushless direct current motor A method for the commutation of a brushless direct current motor having at least one motor winding in which the position of the rotor with respect to the stator is determined, a commutation signal is generated from the position, and the motor winding is energized by... | 04/18/2006 |
| 6940251 | Decoupling of cross coupling for floating reference frame controllers for sensorless control of synchronous machines A synchronous motor controller and method of controlling a synchronous motor without using rotor position sensors are provided. In a floating synchronous reference frame controller, phase currents are measured and a current Park vector is determined. The error betwe... | 09/06/2005 |
| 6933704 | Slip-inducing rotation starting exciter for turbine generator A dynamoelectric machine combining the functions of an exciter, a turning motor, and a starting motor for a turbine. The machine operates in a first mode where the slip between a first stator winding and a first armature winding is positive and thus the magnetic fie... | 08/23/2005 |
| 6900613 | Motor control apparatus A motor control apparatus includes a phase current detecting section for detecting phase currents to a motor, a current phase/current peak value calculating section for calculating a current phase based on the phase currents, a voltage phase setting section for addi... | 05/31/2005 |
| 6828919 | Exciter assembly telemetry An exciter assembly supplies current to a superconducting load. The exciter assembly includes a transformer for generating the current and an optical emitter and an optical receiver. The transformer includes a stationary winding portion having a stationary winding a... | 12/07/2004 |
| 6801011 | Magnetic pole position estimating method and control apparatus for synchronous motor The invention has an object to provide a magnetic pole position estimating method and a control apparatus for a synchronous motor which reliably detect the position of a magnetic pole of the synchronous motor to carry out stable control also when a high load is appl... | 10/05/2004 |
| 6401875 | Absolute position sensing method and apparatus for synchronous elevator machines by detection stator iron saturation A method and apparatus of determining the position of a rotor at standstill relative to a stator in a synchronous motor elevator machine includes injecting an AC current having a predetermined single frequency and a predetermined initial phase angle into ... | 06/11/2002 |
| 6310450 | Drive system of a brushless motor equipped with hall sensors self-discriminating the actual phasing of the installed sensors A method is for decoding three logic signals produced by three Hall effect sensors installed in an electronically-switched three-phase brushless motor according to a sequence of six driving phases to be switched synchronously with a rotor position. The me... | 10/30/2001 |
| 6114827 | Device for controlling a synchronous electric motor with a permanent magnet rotor A device for controlling a synchronous electric motor with a permanent magnet rotor. The device comprises a stator including a winding disposed around a stack of laminations and with which is associated a permanent magnet rotor. Controlled conductor devic... | 09/05/2000 |
| 5912542 | Variable load inductance compensation for motor drive circuits The apparatus includes a motor control circuit including an amplifier with an inductance compensation circuit responsive to a motor, such as a switched reluctance motor, having inductance variations. The inductance compensation circuit includes at least t... | 06/15/1999 |
| 5912543 | Circuit having a digital controller for operation of a synchronous T motor Electronic circuit having a digital controller operation of a synchronous motor. Precision motors for driving, for example, a video head drum in video recorders are normally designed as externally commutated synchronous motors. These motors are driven wit... | 06/15/1999 |
| 5793180 | Fully digital drive system for brushless motor with voltage or current profiles read from a digital memory Pre-defined driving profiles for the distinct phase-windings of an electronically controlled brushless motor are continuously reconstructed for each switching phase and forced in the form of a drive current or voltage on the respective windings, in synchr... | 08/11/1998 |
| 5740880 | Speed tracking of induced armature field in electric power assisted steering Electric motors having controllable induced armature fields, such as induction motors and synchronous reluctance motors, are used in power assisted steering systems for motor vehicles. Power is conserved by tailoring induced armature fields or rotor flux ... | 04/21/1998 |
| 5656911 | Circuit for driving permanent-magnet synchronous motor using proportional controller A driving device controls a permanent-magnet synchronous motor having a permanent magnet in its rotor using a voltage-type inverter supplying drive power for the synchronous motor, makes the torque of the synchronous motor and the d-axis current flowing i... | 08/12/1997 |
| 5565750 | Apparatus for applying field excitation to a synchronous electric motor The present invention provides a digital circuit for controlling application of DC excitation to the rotor field winding of a synchronous electric motor. The circuit detects the analog slip frequency of the motor and converts the analog signal to a digita... | 10/15/1996 |
| 5053689 | Method and apparatus for improving performance of AC machines A method and apparatus for improving the performance of polyphase AC machines. The polyphase AC machines are excited both with a fundamental frequency and with an odd harmonic of the fundamental frequency. The odd harmonic flux wave is phase controlled so... | 10/01/1991 |
| 4939441 | Excitation system for a brushless generator having separate AC and DC exciter field windings An excitation system for a brushless generator includes an exciter portion having a set of polyphase exciter field windings and an additional exciter field winding disposed in a stator of the generator, a source of polyphase, constant-frequency AC power a... | 07/03/1990 |
| 4825138 | Brushless synchronous motor with short-circuited protective winding for the field winding of the rotor In a brushless synchronous motor in which a short-circuited protective winding (9) is associated with the field winding (2) of the rotor the starting conditions are improved in that the protective winding (9) consists of two winding sections (10, 11), whi... | 04/25/1989 |
| 4704569 | Dynamoelectric machine excitation system with improved gate module An electronic sensing and triggering circuit including an integrated overvoltage protection circuit is used in conjunction with an energy storage capacitor as well as output transistors for providing a vigorous voltage pulse supplied through a current pul... | 11/03/1987 |
| 4659973 | Brushless exciter for controlling excitation of a synchronous machine A brushless exciter is provided for controlling excitation of a synchronous motor. The brushless exciter uses a center tapped rotating transformer, a discharge resistor, a field winding which has one end coupled to the ends of the rotating transformer and... | 04/21/1987 |
| 4656410 | Construction of single-phase electric rotating machine When a single-phase electric rotating machine has a stator provided with a main armature winding which is composed of, at least, four winding circuits in such a bridge circuit way as can be formed by connecting one set of series-connected two winding circ... | 04/07/1987 |
| 4591775 | Electric synchronous machine which is excited via rotating rectifiers An electric synchronous machine is excited via rotating rectifiers by an exciter machine. To this end, the three-phase winding of the exciter machine is connected to two Y-connected rectifiers having different current conduction directions. One end of the... | 05/27/1986 |
| 4422028 | Brushless excitation system with a holding current resistor A brushless excitation system for a synchronous motor with a holding current resistor connected across the motor field winding to insure turning on of a semiconductor excitation control switch due to a gating pulse of limited duration.... | 12/20/1983 |
| 4315202 | Synchronous motors A synchronization arrangement for delaying excitation of the field winding (5) of a brushless synchronous motor until the motor rotor has run up approximately to synchronous speed in which the appropriate moment for applying the field excitation is determ... | 02/09/1982 |
