WO1993019458A1 - Suppression electronique du bruit d'un moteur a courant continu - Google Patents

Suppression electronique du bruit d'un moteur a courant continu Download PDF

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Publication number
WO1993019458A1
WO1993019458A1 PCT/US1992/002073 US9202073W WO9319458A1 WO 1993019458 A1 WO1993019458 A1 WO 1993019458A1 US 9202073 W US9202073 W US 9202073W WO 9319458 A1 WO9319458 A1 WO 9319458A1
Authority
WO
WIPO (PCT)
Prior art keywords
motor
slot
armature
vibration
field
Prior art date
Application number
PCT/US1992/002073
Other languages
English (en)
Inventor
Dexter Smith
Joseph Schwartz
Eldon W. Ziegler, Jr.
Original Assignee
Noise Cancellation Technologies, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Noise Cancellation Technologies, Inc. filed Critical Noise Cancellation Technologies, Inc.
Priority to EP92915176A priority Critical patent/EP0631685A4/fr
Priority to PCT/US1992/002073 priority patent/WO1993019458A1/fr
Publication of WO1993019458A1 publication Critical patent/WO1993019458A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/24—Casings; Enclosures; Supports specially adapted for suppression or reduction of noise or vibrations
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
    • G10H1/00—Details of electrophonic musical instruments
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K23/00—DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors
    • H02K23/66—Structural association with auxiliary electric devices influencing the characteristic of, or controlling, the machine, e.g. with impedances or switches
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
    • H02P7/06—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current
    • H02P7/18—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power
    • H02P7/24—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices
    • H02P7/28—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices
    • H02P7/298—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature and field supplies
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/10—Applications
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/10—Applications
    • G10K2210/121—Rotating machines, e.g. engines, turbines, motors; Periodic or quasi-periodic signals in general
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/10—Applications
    • G10K2210/123—Synchrophasors or other applications where multiple noise sources are driven with a particular phase relationship
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/30—Means
    • G10K2210/301—Computational
    • G10K2210/3013—Analogue, i.e. using analogue computers or circuits
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/30—Means
    • G10K2210/301—Computational
    • G10K2210/3045—Multiple acoustic inputs, single acoustic output
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/30—Means
    • G10K2210/321—Physical
    • G10K2210/3212—Actuator details, e.g. composition or microstructure
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/50—Miscellaneous
    • G10K2210/501—Acceleration, e.g. for accelerometers

Definitions

  • This invention relates to the active electronic cancellation of vibration emitted from operating DC motors, especially motor related tonal vibration.
  • the use of active noise control in DC motors allows for savings in space and weight by replacement of selected conventional noise and vibration absorption materials with active control.
  • Critical ways to eliminate this noise are by cancelling the drive motor slot noise or other motor related tonals such as SCR vibration.
  • DC motors come in various configurations but a typical configuration is a separately excited, DC motor where three phase 60 Hz power from an AC source E such as a diesel motor generator is full wave rectified with six SCR's per drive motor. The phase angle relative to line frequency during which the SCR's turn on is varied to control the speed of the unit be driven. Tonal noise appears at frequencies related to the passage of armature slots within the motors or to harmonics of line frequency if an SCR drive is used. If multiple motors are run at different speeds then slot tones appear, one for each of the motor rates.
  • Noise Cancellation Technologies, Inc. has devised controllers which, when coupled to the circuit described herein, can actively control the slot noise.
  • NCT has developed several adaptive active cancellation controllers such as the NCT 2000 & 2010 both commercially available that have been used successfully to cancel periodic noise which arises, typically, from rotating machinery or other repetitive sources. These controllers eliminate noise by adapting the coefficients of cosine and sine components of the frequencies to be cancelled to produce an 180 degree out of phase signal to cancel the tonal noise. This results in very selective cancellation of the tonals related to the actual rate at which the equipment is operating. Adaptation to changes in the noise is very rapid. Also, the need for a reference signal of the actual noise from each source is eliminated and only synchronizing speed signals from the sources are needed.
  • Adaptation speed is controlled by a parameter that determines the bandwidth of the cancelling signal. Increasing the speed of adaption increases the bandwidth of the cancelling signal. Selection of the parameter value is dependent upon finding an optimum trade off between the need to track time varying propagation characteristics and the desire to minimize the bandwidth of the cancelling signal.
  • This invention also makes use of the technique of using multiple sensors and actuators to generate the optimum control signal detailed in Patent 5,091,953 "Repetitive Phenomena Cancellation Arrangement with Multiple Sensors and Actuators" which is hereby incorporated herein by reference.
  • This technique can make use of multiple input signals and can generate multiple output signals that do not interfere with each other. That is, the controller will not try to cancel a signal from an actuator. It subtracts out these actuator signals from the control error minimization function by obtaining transfer functions between all sensors and actuators during calibration. Therefore, the algorithm knows what any particular actuator signal will look like at any sensor and subtracts it out of each sensor signal.
  • one or more accelerometers are used as the sensors and the field and/or armature currents are used as the extractors.
  • the transfer functions between field excitation and the sensors and between armature excitation and sensors are determined.
  • the sensor signals are minimized at the frequencies of interest. Note that this alogrithm is robust in that disconnecting one or more sensors and/or one actuator will not cause the system to become unstable; instead, the algorithm simply calculates new control signal(s) based on the remaining sensor information available to it.
  • slot noise results as torque impulses are induced from the rotor to the stator of the drive motors as the armature rotates. These torque impulses are induced as slots on the armature pass by the motor stator poles. Use of helical slots reduces but does not eliminate the torque impulses.
  • the electrical power to the drive motor is modulated thus producing counter forces within the motor itself which act to counter the slot related impulses.
  • transducers such as accelerometers, which can sense slot rate vibration are mounted either on the motor or its mounting bracket/foundation to provide a feedback signal to the active cancellation controller.
  • Another object of this invention is to provide a method of cancelling slot noise or other motor related harmonics in a DC motor. Another object of this invention is to use an active noise controller to cancel the slot noise or other harmonics in motors where rotational speed varies under load.
  • a further object of this invention is to provide a technology to quiet slot noise or other harmonics in a motor.
  • Fig. 1 shows a diagrammatic view of a typical DC motor/generator set and an alternative drive system.
  • Fig. 2 shows a typical circuit arrangement for typing an active noise controller into a slot noise cancellation circuit, and
  • Fig. 3 shows the specific circuit for a field circuit connected slot noise quieting arrangement
  • Fig. 4 shows the specific circuit for an armature circuit connected slot noise quieting arrangement
  • Fig. 5 shows a typical armature having longitudinal straight slots
  • Fig. 6 shows a partial diagrammatic view of the interrelationships of the armature slot and the motor field poles.
  • stator In any rotating machine, either motor or generator, there is a stationary frame called the stator and a moving shaft called the rotor that revolves within the stator at some mechanical angular frequency.
  • armature or working coil In a synchronous or non-synchronous AC machine the armature or "working coil" is on the stator whereas in a DC machine the armature coil is on the rotor.
  • stator and rotor In motors, both stator and rotor have associated with them magnetic fields that interact to cause the rotor to turn under a load at some angular frequency.
  • Rotors are usually constructed of cylindrical, laminated steel with a number of slots or "teeth" evenly spaced that run the length of the rotor. Coils of insulated wire are wound about these slots. The magnetic force between the stator and rotor has a small variation superimposed on it at a frequency equal to the number of rotor teeth passing by the stator poles per second. These alternating forces will cause vibration in the stator frame.
  • the stiffness of the frame can be changed to destroy any particular resonance.
  • other methods are necessary to cover the entire range of rotational speeds.
  • the frames may be relatively lightweight which may exacerbate the problem.
  • Direct Current (DC) motors are used primarily where rotational speed will be varied under load such as in propulsion motors for locomotives or ships.
  • a DC motor armature is on the rotor and the stator consists of a fixed magnetic field.
  • the stator field may be from fixed magnets or a set of windings in parallel or series to the armature windings.
  • the speed of rotation of the armature is determined by the amount of current flowing in the armature coils.
  • a commutator arrangement consisting of carbon brushes in contact with two or more copper segments from each slot winding reverses the polarity of the rotor field (or turns on the next slot winding in multiple slot armatures) to keep the torque unidirectional.
  • Fig. 1 shows a typical motor/generator set up with diesel 1 driving a DC generator 2 whose output, in turn drives a DC motor 3.
  • the brushes can spark at the commutator due to the current in one slot not decaying to zero before the next slot is turned on. The balance of the current then jumps to zero as a spark.
  • interpoles consisting of small windings in series with the armature are added between the poles. The polarity of the interpoles is such that they are always the same as the pole behind them from the point of view of rotation of the armature.
  • FIG. 5 and 6 there is shown an armature 41 having longitudinal slots as at 42 which are not skewed but straight in this configuration.
  • FIG. 6 there are shown slots as at 42 with an air gap £ between the bottom of the slot and brushes as at 43, 44 and stator 45.
  • the rotational speed is determined by the amount of current in the armature coils and the field excitation.
  • the physical force between armature 41 and field pole 45 changes due to the changing of the length (£ ) of the air gap which pushes on the massive poles and is translated to the relatively thin frame mounts of the motor causing it to vibrate.
  • the reluctance (R) of the air gap is directly proportional to the length (£ ) of the air gap.
  • T is the constant torque which is dependent on the magnetic in the air gap flux.
  • the magnetic field between the armature and slots changes thereby causing an addition sinusoidal torque T component at the slot frequency.
  • the slot vibration which can be measured with an accelerometer, is as follows
  • Control of DC motors can be with direct DC waveforms or with SCR type switching waveforms.
  • Older systems called Ward-Leonard systems, consisted of diesel engines connected to DC generators which in turn were connected to the DC motor. Varying the speed of the diesel varied the speed of the motor. For smaller motors, it is also possible to drive them directly with solid state power transistors from a variable DC power supply.
  • Modern solid stale control of DC motors is with SCR controllers.
  • the SCR is a device mat delivers a RMS DC output from an AC input. The device turns on at different points in the AC cycle based on inputs to its gate. Note that this sudden turning on and off generates harmonics in the current drive to the motor and can excite vibration in the motor that can be transmitted through the mount to the surrounding structure.
  • Fig. 2 shows a typical circuit arrangement for controlling slot noise in a DC motor with power supply 10, DC motor 11, field winding 15, armature winding 14, controller 12 and accelerometer 13 and synch to determine fundamental noise value.
  • Many years ago it was determined that if the number of rotor teeth divided by the number of poles was an integer, a compressed and extended mode of vibration was excited. If there were n+1/2 teeth per pole, other modes were excited.
  • the solution was to skew the slots either by one full tooth pitch over the length of the rotor or over half the length of the armature (herringbone pattern). The idea is that pull between pole and rotor over half the armature is compensated by push over the other half. The practical drawback is the cost of these complicated rotor designs. In addition, straight skewing the slots does not reduce the slot noise significantly in many motors.
  • Fig. 3 shows a typical circuit 20 for a field coil connection with variable resistance 21 and transistor 22 such as a 2N3773 connected to produce an output at the field coil.
  • An NCT controller is capacitively coupled in on top of the bias 23. Current is injected through the field at the lot rate.
  • Fig. 4 shows the circuitry 30 for the armature coil connection with resistances 31, 32, capacitor 33 and transistors 34, 35 (such as 2N3773) and connection 36 to the controller.
  • the controller can be manual using an HP3314A Function Generator or equivalent to produce the correctly phased cancellation signal relative to tbe synch signal. The output is adjustd to cause the residual vibration signal to go to zero.
  • the controller can also be automatic, closed loop, interacting control such as the NCT 2010 running MIS ACT software.
  • the res ⁇ dual(s) are controlled, via mathematical algorithms, to zero continuously.
  • the control will track as RPM changes and one channel will cancel only the residual vibraiton not another channel's cancellation signal.
  • the sync used can be an optical sensor or magnetic pickup and the DC voltage used can be variable.
  • the motor used for the demonstration was a 1 hp, separately excited DC motor. It has 19 slots which are skewed but still produce significant slot vibration.
  • the slot frequency can be observed by optically encoding the shaft with the same number of slots or by placing a magnetic pickup coil at the edge of the field pole. This forms the synch signal.
  • the residual signal is obtained from an accelerometer placed on the motor case or on the base plate.
  • the control signal is synchronized to the sync signal and varies its output waveform, phase and amplitude to minimize the residual signal.
  • the field coil is attractive from an implementation because it is an order of magnitude less power compared to the armature coil and its construction and function is simple.
  • a successful demonstration of the technology was made using the armature coil.
  • the vibration at the motor base plate was reduced 12 db on the average on one side at a time using manual adaptive control.
  • the phase, amplitude, and symmetry of a sinusoidal output to the armature coil was varied to produce the reduction in vibration.
  • the solution tracked in frequency as the shaft speed was varied up and down from the nominal. Applying control produced no change in speed and therefore no change in torque.
  • the field control circuit was identical to the armature circuit showed previously only with two, not four final power transistors.
  • the field control showed a decrease of 3-5 db globally on the motor base plate (not only one side as in the armature control experiment). With control amplitude relatively small, no change in speed and therefore torque was observed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Control Of Direct Current Motors (AREA)
  • Control Of Electric Motors In General (AREA)

Abstract

Système actif d'atténuation du bruit d'un moteur à courant continu (11) permettant d'obtenir une réduction globale des bruits produits par les encoches d'armature ou par d'autres parties du moteur au niveau de la plaque sur laquelle le moteur est monté, sans modifier la structure du moteur. Le système comprend un ou plusieurs capteur(s) de vibrations (13), un signal synchronisé sur la fréquence des bruits produits par les encoches d'armature ou par d'autres parties du moteur, une unité de commande électronique adaptive (12) et des moyens servant à injecter le signal de commande dans le courant de champ et/ou d'induit du moteur.
PCT/US1992/002073 1992-03-19 1992-03-19 Suppression electronique du bruit d'un moteur a courant continu WO1993019458A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP92915176A EP0631685A4 (fr) 1992-03-19 1992-03-19 Suppression electronique du bruit d'un moteur a courant continu.
PCT/US1992/002073 WO1993019458A1 (fr) 1992-03-19 1992-03-19 Suppression electronique du bruit d'un moteur a courant continu

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US1992/002073 WO1993019458A1 (fr) 1992-03-19 1992-03-19 Suppression electronique du bruit d'un moteur a courant continu

Publications (1)

Publication Number Publication Date
WO1993019458A1 true WO1993019458A1 (fr) 1993-09-30

Family

ID=22230885

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1992/002073 WO1993019458A1 (fr) 1992-03-19 1992-03-19 Suppression electronique du bruit d'un moteur a courant continu

Country Status (2)

Country Link
EP (1) EP0631685A4 (fr)
WO (1) WO1993019458A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998030813A1 (fr) 1997-01-07 1998-07-16 Gte Internetworking Incorporated Annulation active du bruit se produisant a des frequences d'engrenement d'engrenages dans des systemes d'engrenages soumis a une charge
EP0887915A2 (fr) * 1997-06-26 1998-12-30 Electric Boat Corporation Configuration multi-canal d'enroulements de moteur et commande à modulation de larguer d'impulsion
US6865466B2 (en) 2000-04-27 2005-03-08 American Axle & Manufacturing, Inc. Active vibration cancellation of gear mesh vibration
EP1357540A3 (fr) * 2002-04-22 2009-04-01 Siemens VDO Automotive Inc. Calibration d'un microphone pour un système actif de suppresion du bruit
WO2011067337A1 (fr) * 2009-12-03 2011-06-09 Conti Temic Microelectronic Gmbh Procédé et dispositif de mise en œuvre d'un moteur électrique

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4490841A (en) * 1981-10-21 1984-12-25 Sound Attenuators Limited Method and apparatus for cancelling vibrations
US4878188A (en) * 1988-08-30 1989-10-31 Noise Cancellation Tech Selective active cancellation system for repetitive phenomena
US4912387A (en) * 1988-12-27 1990-03-27 Westinghouse Electric Corp. Adaptive noise cancelling for magnetic bearing auto-balancing
US4999534A (en) * 1990-01-19 1991-03-12 Contraves Goerz Corporation Active vibration reduction in apparatus with cross-coupling between control axes
US5091953A (en) * 1990-02-13 1992-02-25 University Of Maryland At College Park Repetitive phenomena cancellation arrangement with multiple sensors and actuators
US5109171A (en) * 1988-11-11 1992-04-28 Papst-Motoren Gmbh & Co. Kg Low-noise miniature electric motor

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Publication number Priority date Publication date Assignee Title
DE2338307C3 (de) * 1973-07-27 1981-04-02 M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 8000 München Elektromagnetische Einrichtung zum Antrieb und zur zentrierenden Lagerung von Drehkörpern
FR2613149B1 (fr) * 1987-03-26 1994-03-18 Etat Francais Delegue Armement Moyens de controle electromagnetique des vibrations dans les machines electriques
US4892273A (en) * 1988-12-30 1990-01-09 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Active damping of spacecraft structural appendage vibrations

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4490841A (en) * 1981-10-21 1984-12-25 Sound Attenuators Limited Method and apparatus for cancelling vibrations
US4878188A (en) * 1988-08-30 1989-10-31 Noise Cancellation Tech Selective active cancellation system for repetitive phenomena
US5109171A (en) * 1988-11-11 1992-04-28 Papst-Motoren Gmbh & Co. Kg Low-noise miniature electric motor
US4912387A (en) * 1988-12-27 1990-03-27 Westinghouse Electric Corp. Adaptive noise cancelling for magnetic bearing auto-balancing
US4999534A (en) * 1990-01-19 1991-03-12 Contraves Goerz Corporation Active vibration reduction in apparatus with cross-coupling between control axes
US5091953A (en) * 1990-02-13 1992-02-25 University Of Maryland At College Park Repetitive phenomena cancellation arrangement with multiple sensors and actuators

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP0631685A4 *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998030813A1 (fr) 1997-01-07 1998-07-16 Gte Internetworking Incorporated Annulation active du bruit se produisant a des frequences d'engrenement d'engrenages dans des systemes d'engrenages soumis a une charge
EP0951620A1 (fr) * 1997-01-07 1999-10-27 GTE Internetworking Incorporated Annulation active du bruit se produisant a des frequences d'engrenement d'engrenages dans des systemes d'engrenages soumis a une charge
EP0951620A4 (fr) * 1997-01-07 2003-05-14 Gte Service Corp Annulation active du bruit se produisant a des frequences d'engrenement d'engrenages dans des systemes d'engrenages soumis a une charge
EP0887915A2 (fr) * 1997-06-26 1998-12-30 Electric Boat Corporation Configuration multi-canal d'enroulements de moteur et commande à modulation de larguer d'impulsion
EP0887915A3 (fr) * 1997-06-26 1999-04-21 Electric Boat Corporation Configuration multi-canal d'enroulements de moteur et commande à modulation de larguer d'impulsion
US6232731B1 (en) 1997-06-26 2001-05-15 Electric Boat Corporation Multi-channel motor winding configuration and pulse width modulated controller
US6865466B2 (en) 2000-04-27 2005-03-08 American Axle & Manufacturing, Inc. Active vibration cancellation of gear mesh vibration
EP1357540A3 (fr) * 2002-04-22 2009-04-01 Siemens VDO Automotive Inc. Calibration d'un microphone pour un système actif de suppresion du bruit
WO2011067337A1 (fr) * 2009-12-03 2011-06-09 Conti Temic Microelectronic Gmbh Procédé et dispositif de mise en œuvre d'un moteur électrique
US9048772B2 (en) 2009-12-03 2015-06-02 Conti Temic Microelectronic Gmbh Method and device for operating an electric motor

Also Published As

Publication number Publication date
EP0631685A1 (fr) 1995-01-04
EP0631685A4 (fr) 1996-01-17

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