Including A Dynamoelectric Machine Patents (Class 323/201)
-
Patent number: 9570978Abstract: In order to avoid the continuation of the abnormality control state by detecting the disconnection abnormality of the ground wiring line of a power supply control device provided between a DC power supply and a plurality of inductive loads, the power supply control device to which electric power is supplied through a power supply terminal includes a microprocessor that performs switching control of power switching elements, a constant voltage power supply, and commutation diodes connected in parallel to inductive loads, a power capacitor connected between the power supply terminal and a ground terminal is charged by the commutation current of the intermittently driven inductive loads when the ground terminal is disconnected and accordingly the voltage of the power capacitor rises, and the disconnection abnormality of the ground wiring line is detected when the voltage exceeds a predetermined threshold value and the power switching elements are simultaneously cut off.Type: GrantFiled: February 4, 2014Date of Patent: February 14, 2017Assignee: Mitsubishi Electric CorporationInventors: Shuichi Matsumoto, Masao Motonobu, Masahiko Sayama
-
Patent number: 8232755Abstract: A DC motor is provided. The DC motor prevents rush or overload of current in the DC motor during and/or after power input irregularities to the DC motor. A control circuit of the DC motor is configured to control current provided to the DC motor. When power irregularities in the power input to the DC motor are detected by the control circuit, the control circuit stops generating PWM (Pulse Width Modulated) signals and stops the current provided to the DC motor. After the stoppage of PWM signals, the control circuit can perform a soft-start of the PWM signals when the power irregularities are no longer detected. The soft starting of the PWM signals generates gradual increase in current to the DC motor, thus, preventing sudden rush of current that cause malfunction of the DC motor.Type: GrantFiled: April 2, 2009Date of Patent: July 31, 2012Inventor: Young-Chun Jeung
-
Patent number: 7671556Abstract: An image sensing apparatus, which has a constant-voltage driven stepping motor, comprises a PWM waveform generation part that generates pulse signals to be applied to switching devices; and a PWM waveform determination section that determines a PWM waveform to be generated by the PWM waveform generation section. The PWM waveform determination section determines, in accordance with the determined rotation speed value and output torque value of the stepping motor, a duty ratio range that is a range extending from the minimum to the maximum of the duty ratio of the pulse signals. It is designed that the higher the rotational speed value is, the wider the duty ratio width is.Type: GrantFiled: May 31, 2006Date of Patent: March 2, 2010Assignee: Rohm Co., Ltd.Inventor: Makoto Shimada
-
Patent number: 7566828Abstract: A power source device is provided which is capable of charging a secondary cell in a stable manner even in an environment in which power generated by a solar cell varies due to changes in sunlight intensity and/or ambient temperatures. By power generated by a solar cell module, an electric double-layer capacitor is charged and, by using a charging voltage of the electric double-layer capacitor, a booster-type DC-DC (Direct Current-Direct Current) converter is driven. A charge on/off controlling circuit detects the voltage of the electric double-layer capacitor and, when the voltage exceeds a high level threshold voltage, keeps a charge controlling signal (output signal from a terminal) in an active mode and performs a charge starting operation and, after that, when the voltage of the electric double-layer capacitor reaches a low level threshold value, holds the charge controlling signal in a non-active mode and performs a charge stopping operation.Type: GrantFiled: May 12, 2005Date of Patent: July 28, 2009Assignee: NEC Tokin CorporationInventor: Hiroshi Sasaki
-
Patent number: 7525318Abstract: A load abnormality detecting system and method for detecting the burnout and short circuit of a load are provided. A voltage generator (10) generates a specified voltage Vs in accordance with a load current IL. A judging device (4) compares a signal corresponding to this voltage (Vs) with a specified reference value (T1, T2) to judge whether a load (2) has any abnormality. A selector (6) causes the burnout reference value (T1) to be inputted to the judging device (4) and controls the voltage generator (10) to use a first resistance value when checking the burnout of the load (2) while causing the short-circuit reference value (T2) to be inputted to the judging device (4) and controlling the voltage generator (10) to use a second resistance value when checking the short circuit of the load (2).Type: GrantFiled: March 6, 2007Date of Patent: April 28, 2009Assignee: Sumitomo Wiring Systems, Ltd.Inventor: Takeshi Endoh
-
Patent number: 7176650Abstract: An electrical machine is controlled without using a physical rotor position detector. Rotor position is estimated by an algorithm which receives feedback from a parameter which represents the behavior of a phase of the machine. Before the algorithm estimates position, it checks the value of the parameter to ensure that the phase is healthy. In the event of the parameter indicating that the phase is faulty, the algorithm does not attempt to estimate position from that phase, thereby avoiding the generation of faulty position data. Operation of the machine may be continued using only the healthy phases.Type: GrantFiled: October 24, 2005Date of Patent: February 13, 2007Assignee: Switched Reluctance Drives LimitedInventor: Peter Richard Mayes
-
Publication number: 20040189262Abstract: A circuit device for providing energy to at least one electrical component, such as a light emitting diode (LED). The circuit device comprises a positive contact, an inductor, a diode and a negative contact in series. A first component contact for electrical connection to a cathode end of an electrical component, a second component contact for electrical connection to an anode end of an electrical component, a switch and a control device are also included. The first component contact is electrically connected to a junction between the positive contact and one end of the inductor; and the second component contact is electrically connected to a cathode end of the diode. There are also provided a circuit device further including an LED, an assembly including a circuit device and a bulb base, a flashlight including an assembly, and a method of directly replacing a flashlight bulb.Type: ApplicationFiled: March 1, 2004Publication date: September 30, 2004Applicant: LEDdynamicsInventor: William R. McGrath
-
Patent number: 6765305Abstract: A device is described for generating an electric voltage by which a body of a capacitive and/or inductive sensor capable of vibration, such as a capacitive micromechanical rotational rate sensor in particular, is induced to vibrate. In order to reduce the manufacturing cost of the sensor, a voltage generating device is provided which induces a constant mechanical deflection of the body capable of vibration, this deflection being independent of the manufacturing tolerances of the sensor.Type: GrantFiled: January 29, 2003Date of Patent: July 20, 2004Assignee: Robert Bosch GmbHInventors: Jens Mohaupt, Johannes Artzner, Wolfram Bauer
-
Publication number: 20040100229Abstract: The present invention provides an improved arrangement for supplying emergency power to a wind power installation. In the event of a power failure, sufficient emergency power may be supplied to reposition the rotor blades of the wind power installation and avoid damage to the overall system. This is done through the use of one or more capacitors. The capacitors may be charged with energy during the normal operation of the wind power installation and, in the event of a system failure, the energy stored within the capacitors may be used to provide emergency functions. In addition to repositioning the rotor blades, the stored energy may be used, for example, to rotate the wind power installation pod away from the wind and power emergency or auxiliary lighting systems.Type: ApplicationFiled: July 11, 2003Publication date: May 27, 2004Inventor: Aloys Wobben
-
Publication number: 20040075421Abstract: The invention relates to a voltage regulating circuit arrangement (1, 101) for converting a first voltage (VEXT) applied to an input of said voltage regulating circuit arrangement (1, 101) into a second voltage (VBLH) that may be tapped at an output (10, 110) of said voltage regulating circuit arrangement (1, 101), wherein, when said first voltage (VEXT) falls below a threshold value (VEXT_THRESHOLD), the first voltage (VEXT) applied to the input of said voltage regulating circuit arrangement (1, 101) is connected through to said output (10, 110) of said voltage regulating circuit arrangement (1, 101).Type: ApplicationFiled: June 18, 2003Publication date: April 22, 2004Inventors: Jens Egerer, Thomas Borst
-
Publication number: 20030151394Abstract: A device (100, 200) is described for generating an electric voltage by which a body of a capacitive and/or inductive sensor capable of vibration, such as a capacitive micromechanical rotational rate sensor in particular, is induced to vibrate.Type: ApplicationFiled: January 29, 2003Publication date: August 14, 2003Inventors: Jens Mohaupt, Johannes Artzner, Wolfram Bauer
-
Publication number: 20030057927Abstract: A drive system, includes a motor having a neutral terminal, a converter, which has a voltage intermediate circuit and is electrically connected to the motor, a switching device, and a holding brake, which is mechanically connected to the motor. The holding brake has a first terminal, which is connected to the neutral terminal of the motor, and a second terminal, which is connected with a negative busbar of the voltage intermediate circuit via the switching device.Type: ApplicationFiled: September 18, 2002Publication date: March 27, 2003Applicant: SIEMENS AKTIENGESELLSCHAFTInventor: Albrecht Donat
-
Publication number: 20020158611Abstract: The present invention discloses a novel apparatus and method for stabilizing the frequency of a laser. To avoid the effect that a single-frequency absorption spectrum is easy to be affected by variations of laser power and the complexity to modulate a laser frequency, the present invention adopts at least two laser beams at different frequencies and obtains an error signal that is a difference in absorption spectrums of the laser beams. Since the error signal is a difference between two laser beams coming from an identical laser source, the variation of laser power could be eliminated. Furthermore, since the absorption spectrum is usually above hundreds of (MHz), the range of locked frequency of the present invention is large, and the laser frequency is not easily unlocked due to outside disturbance.Type: ApplicationFiled: December 4, 2001Publication date: October 31, 2002Applicant: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTEInventors: Jin-Long Peng, Mao-Sheng Huang, Antony Yao
-
Publication number: 20020097028Abstract: A capacitive high voltage generator comprising a first stage and a second stage respectively formed by a first basic block and a second basic block and a third basic block. Each basic block has a timing input, a first supply input, a second supply input and an output terminal and comprises: a buffer having a first terminal connected to the first supply input of the corresponding basic block, a second terminal connected to a ground terminal and an input terminal connected to the timing input of the corresponding basic block; a capacitor having a first terminal connected to an output terminal of the corresponding buffer and a second terminal connected, in a non-disconnectable way, to the output terminal of the corresponding basic block; a diode having a first terminal connected to the second supply input and a second terminal connected, in a non-disconnectable way, to the output terminal of the corresponding basic block.Type: ApplicationFiled: October 18, 2001Publication date: July 25, 2002Applicant: STMicroelectronics S.r.l.Inventor: Luca Fontanella
-
Publication number: 20020067153Abstract: A method for dynamically determining tap position in a step voltage regulator is disclosed. A present tap position is determined and the value of an applied voltage across a tap changing mechanism is measured. Based upon the value of the applied voltage, a directional change in the tap position is detected. A trigger signal is also generated which is responsive to a detected change in tap position. Finally, a new tap position is calculated based upon the present tap position and the directional change in the tap position, when the trigger signal indicates that a change in tap position has taken place.Type: ApplicationFiled: December 1, 2000Publication date: June 6, 2002Inventors: David Fletcher, Richard Dean Blackburn, Joseph Rao
-
Publication number: 20010001534Abstract: A method and apparatus for compensating, consistent with variations in cooling conditions, protection and limit functions of a generator. Limits of the capability curve of the generator, including the overexcited region, underexcited region and region limited by stator current heating, are modified in response to changes in coolant pressure or temperature depending on the type of generator being compensated. Feedback signals and setpoints being provided to fixed protection and limit functions are intercepted and modified in accordance with the relationship between generator rated values and generator performance in view of altered coolant conditions. Protection and limit functions are automatically coordinated. As a result, overall generator performance is improved.Type: ApplicationFiled: January 16, 2001Publication date: May 24, 2001Applicant: General Electric CompanyInventors: Rodney A. Lawson, William R. Pearson, James E. Curran
-
Patent number: 6153870Abstract: Disclosed is an AC/DC type microwave oven. The AC/DC type microwave oven comprises a rotatable inverter which inverts a DC power source to an AC power source by means of a rotational force, a high voltage transformer which receives a common power source or an AC power inverted by the rotatable inverter and outputs a higher voltage and a magnetron which is driven by the high voltage outputted from the high voltage transformer and radiates a microwave, and further comprises a control unit which controls the operation of the rotatable inverter so as to output a stable frequency. The rotatable inverter comprises a motor, a commutator driven by the motor and a plurality of brushes, which are respectively contacted with an outer surface of the commutator.Type: GrantFiled: January 7, 1999Date of Patent: November 28, 2000Assignee: Samsung Electronics Co., Ltd.Inventors: Chul Kim, Yong-woon Han, Seong-deog Jang, Han-jun Sung
-
Patent number: 6153869Abstract: An AC/DC type microwave oven has a function of managing an input power source. The AC/DC type microwave oven comprises a rotatable inverter which inverts a DC power source to an AC power source by a rotational force, a high voltage transformer which receives a common power source or an AC power inverted by the rotatable inverter and outputs a higher voltage, a magnetron which is driven by the high voltage outputted from the high voltage transformer and radiates a microwave and a power control unit for sensing a signal from a power selecting key and preventing the AC and DC power sources from being simultaneously inputted. Therefore, both of AC power and DC power are prevented from being simultaneously supplied to the microwave oven which could result in a malfunction, or an overload occurs in the electric components of the microwave oven. Therefore, only one input power of the common and DC power sources is selected and, the microwave oven is operated properly.Type: GrantFiled: January 7, 1999Date of Patent: November 28, 2000Assignee: Samsung Electronics Co., Ltd.Inventors: Chul Kim, Yong-woon Han, Seong-deog Jang, Han-jun Sung
-
Patent number: 6023152Abstract: In order to provide a system for stabilizing a power supply system comprising a choke, which connects the power supply system to a mains power feed, a converter system connected to the power supply system and having a converter machine with a rotor and at least one three-phase winding, which is in a position to stabilize the voltage in the power supply system to a specific value it is suggested that the converter system comprise a flywheel storage means with a synchronous machine and a flywheel coupled thereto, that the converter system have a static converter system, with which the flywheel storage means can be coupled to the converter machine such that the flywheel storage means can draw power from the converter machine or supply power to it, and that a control be provided which detects the voltage of the power supply system and controls the static converter system such that the converter machine stabilizes the voltage of the power supply system to a predeterminable value by drawing or supplying power.Type: GrantFiled: April 13, 1998Date of Patent: February 8, 2000Assignee: Piller-GmbHInventors: Ralf Briest, Hilmar Darrelmann, Klaus Sachs, Uwe Schrader-Hausmann
-
Patent number: 5953225Abstract: An interconnection system (100) for transferring power between a first grid (22) operating at a first electrical frequency and a second grid (24) operating at a second electrical frequency includes a rotary transformer (102) and a power recovery system (103). The power recovery system (103) recovers and applies to the transferee grid a power differential attributable to mechanical power channeled to a rotatable shaft (113) of the rotary transformer (102).Type: GrantFiled: November 11, 1997Date of Patent: September 14, 1999Assignee: General Electric Co.Inventor: Einar Vaughn Larsen
-
Patent number: 5767591Abstract: An uninterruptible power supply provides improved reliability by supplying temporary standby power to a critical load and startup power to a backup power source from a single energy storage system. In the preferred embodiment, a flywheel energy storage device that produces three-phase AC voltage is used to provide temporary power to a critical load while a backup power supply, such as a diesel generator set (GENSET), is accelerated to full speed. The startup power for the GENSET is also provided from the flywheel energy storage device through a circuit that converts the AC voltage at one level to DC voltage at a lower level (e.g., 12 or 24 volts). Therefore, backup power will be provided from the GENSET unless a catastrophic failure occurs in the GENSET itself.Type: GrantFiled: September 9, 1996Date of Patent: June 16, 1998Assignee: Active Power, Inc.Inventor: Joseph F. Pinkerton
-
Patent number: 4517471Abstract: A rotary converter machine which includes a stator with three-phase primary, and secondary windings, and a rotor mounted within the stator which includes a damping winding. The primary and secondary stator windings are arranged on a common stator pack and located in continuous stator slots, both windings extending over the whole axial length of the common stator pack. The converter machine provides a direct transfer of the electrical energy by flux linkage between the two windings. The rotor is driven by the rotating magnetic field either asynchronously, if a drum rotor is provided, or synchronously, if a salient-pole rotor is provided.Type: GrantFiled: July 23, 1982Date of Patent: May 14, 1985Assignee: Anton Piller GmbH & Co. KGInventor: Klaus Sachs
-
Patent number: 4368418Abstract: Apparatus for controlling high voltage by absorption of capacitive vars, comprising a stator (10) having a core and a three phase winding (14) connected to the high voltage, and a rotor (12) having magnetic material (20) exhibiting a sharp magnetic saturation. The rotor (12) includes longitudinally extending damper bars (22) imbedded in grooves or slots (24) in a manner similar to the bars used in a squirrel cage rotor. The magnetic structure of the rotor can be of two types--a symmetrical structure for asynchronous operation, and a salient pole structure for synchronous operation. In the case of the symmetrical rotor construction, the stator (10) and rotor (12) constitute a rotating induction reactor (8) which operates in the same manner as a free running, unloaded induction motor. The induction reactor (8) exhibits characteristics similar to a saturable reactor with respect to var versus voltage absorption, but does not have the undesirable harmonics normally present in the saturable reactor.Type: GrantFiled: April 21, 1981Date of Patent: January 11, 1983Assignee: Power Technologies, Inc.Inventors: F. Paul DeMello, Robert J. Ringlee