Upon Failure To Resynchronize Patents (Class 318/707)
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Patent number: 9459320Abstract: A method for detecting a fault in an exciter circuit, suitable for use in a brushless generator, the exciter circuit including (a) an exciter armature winding, having a plurality of armatures, arranged to generate a multiphase AC signal, each armature of the plurality of armatures providing a respective sub-signal component of the multiphase AC signal, and (b) a rectifier circuit for receiving the sub-signals via the respective armatures, the rectifier circuit comprising a plurality of components arranged to rectify the sub-signals to provide a rectified output signal, wherein the method includes the steps of: acquiring a respective operational sub-value for a first characteristic of each of at least two of the respective sub-signals; deriving an operational value indicative of a relationship between the acquired respective operational sub-values; determining whether a fault has occurred in the exciter circuit on the basis of the derived operational value.Type: GrantFiled: December 17, 2014Date of Patent: October 4, 2016Assignee: ROLLS-ROYCE plcInventors: Vaiyapuri Viswanathan, Chandana Gajanayake, Amit Gupta, Sivakumar Nadarajan
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Publication number: 20090102412Abstract: The present invention relates a motor controller and a motor control method of controlling a motor having a stator coil and a rotator.Type: ApplicationFiled: October 16, 2008Publication date: April 23, 2009Applicant: LG ELECTRONICS INC.Inventors: Sun Ho Hwang, Han Su Jung, Chung Hun Lee
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Patent number: 7211984Abstract: A method of starting a permanent magnet machine. A machine stator voltage in a stationary reference frame is sensed. An initial speed of a rotor of the machine is estimated based on the sensed voltage, and state variables of control algorithms are initialized based on the estimated initial speed. This method can provide smooth startup and/or restart at any speed.Type: GrantFiled: November 9, 2004Date of Patent: May 1, 2007Assignee: General Motors CorporationInventors: Nitinkumar R. Patel, Steven E. Schulz, Thomas P. O'Meara
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Patent number: 7145310Abstract: A system for controlling a permanent magnet synchronous motor calculates fundamental a d-axis (or q-axis) voltage command based on a difference between a d-axis (or q-axis) current command and a d-axis (or q-axis) current feedback signal, calculates a harmonic suppression d-axis (or q-axis) voltage command used to suppress at least one higher-order harmonic current component included in a harmonic current component which is calculated based on the differences between the current feedback signals and the current commands, and calculates a d-axis (or q-axis) voltage command by adding the fundamental d-axis (or q-axis) voltage command and the harmonic suppression d-axis (or q-axis) voltage command. The d-axis and q-axis voltage commands are transformed into three-phase voltage commands, which are converted into a drive voltage for driving the permanent magnet synchronous motor. As a result, the harmonic current components are significantly suppressed and the motor's overall performance is improved.Type: GrantFiled: December 12, 2005Date of Patent: December 5, 2006Assignee: Hyundai Motor CompanyInventors: Hyung-Bin Ihm, Gu-Bae Kang
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Patent number: 6992451Abstract: In a motor feedback control, the current supply phase is set on the basis of the encoder count of an encoder and the current supply phase is also set on the basis of the encoder count by time-synchronous processing. In the feedback control, a maximum value or a minimum value of encoder counts is stored with updating. The rotation reversing is determined by comparing the present encoder count with the maximum value or the minimum value. If reversing is detected, the reverse rotation is stopped by fixing the current supply phase. If a disconnection is detected in windings of one phase in starting a motor feedback control, one of the other two phases for which no disconnection is detected is set to the first current supply phase.Type: GrantFiled: October 1, 2003Date of Patent: January 31, 2006Assignee: DENSO CorporationInventors: Shigeru Kamio, Yasuhiro Nakai
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Patent number: 6177777Abstract: The method and the corresponding device allow to start a synchronous motor with the chosen rotation direction, with a very high static torque, without requiring any modification of the structure of the synchronous motors currently in use, by means of an adapted electronic circuit managed by a microprocessor.Type: GrantFiled: February 1, 1999Date of Patent: January 23, 2001Assignees: SICCE S.p.A., Tait S.r.l.Inventor: Giovanni Piazzalunga
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Patent number: 6150790Abstract: A method for the starting and steady-state supply of a permanent-magnet synchronous motor, particularly for driving a centrifugal hydraulic pump. The method comprises three successive steps: a first learning step, a second starting step, and a third steady-state step. During the first step, the rotor is turned through two angles of 180 mechanical degrees in the same direction, storing the parameters of the rotor and particularly determining the initial current and the mechanical zero point of the rotor. During the second step, by generating with a power supply (inverter) a practically sinusoidal current waveform, the rotor is started with a higher current than the stating current and with a low frequency which gradually increases, waiting for the rotor at its transit through 80, 100, 260 and 280 mechanical degrees. Once the intended steady-state speed has been reached, a practically sinusoidal current is applied and the rotor is waited for at transit through the zero points.Type: GrantFiled: March 31, 2000Date of Patent: November 21, 2000Assignees: Sicce S.p.A., Tait S.r.l.Inventors: Giovanni Piazzalunga, Roberto Faccin