Self-cascaded Motor Windings Patents (Class 318/737)
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Patent number: 10760471Abstract: An auxiliary machine-driving device is provided for a vehicle. The auxiliary machine-driving device has a first roller, a second roller, a third roller, a fourth roller and a fifth roller. The first roller rotates integrally with a rotary shaft of an engine. The second roller rotates integrally with a rotary shaft of a motor/generator. The third roller rotates integrally with a rotary shaft of an auxiliary machine. The fourth roller is provided between the first roller and the second roller. The fifth roller that always contacts the second roller and the third roller. The actuator switches the fourth roller between a contact state with the first and second rollers and a separation state from the first and second rollers.Type: GrantFiled: June 22, 2015Date of Patent: September 1, 2020Assignee: Nissan Motor Co., Ltd.Inventors: Takeshi Yamamoto, Shin Hashimoto, Kenshi Ushijima
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Patent number: 9859776Abstract: A rotor of an induction motor includes a shaft, a ferromagnetic rotor core, first and second inductors axially bracketing the rotor core, and a rotor cage. The shaft extends along a stator axis, and the rotor core is disposed coaxially about the shaft. The rotor cage comprises first and second supports, and a plurality of cage bars. The supports are disposed axially between the rotor core and the first and second inductors, respectively. The cage bars surround the shaft, pass through the rotor core, are secured at the first and second supports, and are each electrically connected to both the first and second inductors.Type: GrantFiled: September 22, 2015Date of Patent: January 2, 2018Assignee: Hamilton Sundstrand CorporationInventor: Jacek F. Gieras
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Patent number: 9673749Abstract: Provided is a power equipment which obtains a power saving effect according to the operation of an electric motor by providing a harmonic suppression function on the side of a power trunk line for supplying power to the electric motor without changing the electric motor side. The power equipment includes an electric motor (14) which is supplied with power from a power trunk line (12) connected to a power source transformer (11) to be operated. A harmonic generation unit (13) is provided in the power trunk line (12) and generates a harmonic voltage having a phase opposed to but the same degree as that of a harmonic voltage of a degree acting as a braking force on a rotor (14-2) in a rotational magnetic flux of harmonics generated between a stator (14-1) and the rotor when the electric motor (14) is operated.Type: GrantFiled: November 27, 2014Date of Patent: June 6, 2017Assignee: SHIGA FUNCTIONAL WATER LABORATORY CORPORATIONInventor: Seiki Shiga
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Patent number: 9467081Abstract: Protection system for a power converter connected to a doubly fed induction generator having a rotor and a stator. The power converter includes a grid-side-converter, a machine-side-converter, a DC link between both converters, a chopper connected to the DC link, and a hardware protection system connected to the rotor of the generator. The protection system includes a first control unit for controlling the hardware protection system depending on the voltage in the DC link, a second control unit for controlling the chopper depending on the DC link voltage, and a third control unit for controlling both converters.Type: GrantFiled: September 29, 2014Date of Patent: October 11, 2016Assignee: INGETEAM POWER TECHNOLOGY, S.A.Inventors: Eduardo Sanz Ceballos, Nagore Azkarate Askasua, Jose Carlos Alonso Segade, Iker Esandi Uriz, Ainhoa Cárcar Mayor
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Patent number: 7106013Abstract: A motor drive apparatus includes a comparison circuit comparing voltages of 3-phase coil terminals and the voltage of a neutral point terminal of a 3-phase brushless motor to determine which voltage is higher/lower, a zero ampere current detection circuit detecting, based on the comparison result by the comparison circuit, that the coil current of a position detection phase becomes 0 A, a position detection circuit detecting a zero cross point of the voltage of the position detection phase based on the comparison result by the comparison circuit after the coil current becomes 0 A. Therefore, the zero cross point can be accurately detected without introducing a mask period.Type: GrantFiled: February 1, 2006Date of Patent: September 12, 2006Assignee: Renesas Technology Corp.Inventors: Satoshi Narumi, Hiroyuki Tamagawa
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Patent number: 7075265Abstract: A rotating induction machine, containing five or more different phases, having windings distributed according to a sinc function with a cutoff frequency allowing low-order spatial harmonics but preventing higher order spatial harmonics from flowing. In a preferred embodiment, the machine is connected to drive means capable of injecting third harmonic into the machine. In a further preferred embodiment, the windings are connected to the drive means with a mesh connection and the machine has five phases.Type: GrantFiled: April 3, 2003Date of Patent: July 11, 2006Assignee: Borealis Technical LimitedInventor: Jonathan Sidney Edelson
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Patent number: 6987375Abstract: A dual stage drive for a switched reluctance motor (SRM) is disclosed, the SRM having a plurality of phase coils associated therewith. In an exemplary embodiment, the dual stage drive includes at least one of the plurality of phase coils coupled to a first power bus, and at least another one of the plurality of phase coils coupled to a second power bus. Energy within the at least one phase coil coupled to said first power bus is dissipated through said second power bus.Type: GrantFiled: October 30, 2002Date of Patent: January 17, 2006Assignee: Delphi Technologies, Inc.Inventor: Shaotang Chen
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Patent number: 5189357Abstract: 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 fundamental flux wave and the harmonic flux wave will travel at synchronous speed in the air gap. This facilitates redistributing the flux densities in the machine and thereby increasing the total flux per pole in the machine.Type: GrantFiled: July 17, 1989Date of Patent: February 23, 1993Assignee: Board of Regents, The University of Texas SystemInventors: Herbert H. Woodson, John S. Hsu
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Patent number: 4736147Abstract: The present invention provides a method for starting motors by harmonics for synchronous motors, wound-rotor and cage-rotor asynchronous motors started thereby. During the starting period, according to the present invention, the connection of the stator winding is changed so as to create some very strong harmonic fields. The harmonic fields are associated with the rotor windings and are used to improve the starting performance of the motor. The three motors all have large starting torque, small starting current and can be started by direct-on-line. The wound-rotor asynchronous motor has no brushes or, slip rings on the rotor and there is no electric contact thereby increasing the reliablity of starting and running. The running efficiency is superior to the cage-rotor asynchronous motor.Type: GrantFiled: March 31, 1986Date of Patent: April 5, 1988Assignee: Huazhong Institute of TechnologyInventor: Xu Shizhang
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Patent number: 4634950Abstract: An electric machine which is adapted to function as a motor or generator without any major electrical or mechanical modifications and conforms to conventional electric machine manufacturing practices. This machine has associated therewith, microprocessor controls. There is provided two balanced phase synchronous electrical machines whose moving windings are attached to a common carrier and whose stationary windings are attached to a common body. One of the two balanced phase electric machines is electrically and mechanically designed to be a balanced phase synchronous power motor or power generator at the utility frequency while the other balanced phase electric machine is electrically and mechanically designed for a higher frequency. The high frequency electric machine is driven by a modulated high frequency signal whose modulation frequency is equal to the utility frequency.Type: GrantFiled: July 2, 1984Date of Patent: January 6, 1987Inventor: Frederick W. Klatt
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Patent number: 4476424Abstract: A variable speed induction motor drive system operating at a leading power factor. A prescribed reactive power is coupled to the motor's rotor, to permit line commutation of an inverter supplying the motor's stator, and to permit the inverter to be supplied by a substantially constant dc link voltage.Type: GrantFiled: May 3, 1982Date of Patent: October 9, 1984Assignee: The Garrett CorporationInventor: Gabor Kalman
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Patent number: 4459530Abstract: An electric rotating machine which is adapted to function as a motor or a generator without any major electrical or mechanical modifications. This machine has associated therewith, microprocessor controls. There is provided two balanced phase synchronous electrical rotating machines whose rotors are attached to a common axial. One of the two balanced phase electric rotating machines is electrically and mechanically designed to be a balanced phase synchronous power motor or power generator at the utility frequency while the other balanced phase electric rotating machine is electrically and mechanically designed for a higher frequency. Depending on the modulation type of signal, applied to the stator of the second machine, each of the electrical phase windings of the two rotors are either electrically wired together or electronically connected by a demodulator circuit.Type: GrantFiled: May 20, 1982Date of Patent: July 10, 1984Inventor: Frederick W. Klatt
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Patent number: 4459502Abstract: A self-cascaded reluctance motor is provided with an axially laminated rotor. The motor includes a stator winding having two sets of terminals and wound such that the number of poles between one set of terminals differs from the number of poles between the other set of terminals by more than two. The rotor includes a plurality of axially disposed conductive sheets and magnetic material laminations which are interleaved within each rotor segment to form groups of magnetic material laminations which lie between two of the conductive sheets. The number of conductive laminations is equal to one half of the total number of stator winding poles or an integral submultiple thereof, while the number of groups of magnetic material laminations is equal to one half of the total number of stator pole pairs or an integral submultiple thereof. Short-circuited coils can be substituted for the conductive sheets to provide better coupling between the two stator component windings and thus more output power.Type: GrantFiled: November 17, 1982Date of Patent: July 10, 1984Assignee: Westinghouse Electric Corp.Inventor: Ahmed M. El-Antably
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Patent number: 4445081Abstract: A variable-speed, leading power factor AC machine which may be supplied through a line-commutated inverter.Type: GrantFiled: December 15, 1981Date of Patent: April 24, 1984Assignee: The Garrett CorporationInventors: Gabor Kalman, Graham W. McLean