An apparatus includes a multi-phase inverter, a fault detector to indicate a detection of a fault, a sensor to provide a speed signal indicative of whether a speed of a pm motor is greater than a transition speed, and a controller. The controller is operable to apply either an open-circuit response or a short-circuit response to the multi-phase inverter. The open-circuit response is applied when the speed of the pm motor is greater less than the transition speed and a fault is detected. The short-circuit response is applied when the speed of the pm motor is less greater than the transition speed and the fault is detected. The transition speed is either a fixed predetermined speed or an adjusted predetermined speed.
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1. A method for controlling a multi-phase inverter of a pm motor comprising:
detecting a fault: ;
sensing whether a speed signal indicates that a speed of the pm motor is greater than a transition speed;
applying an open-circuit response when the speed of the pm motor is greater less than the transition speed when the fault is detected; and
applying a short-circuit response when the sped of the pm motor is less greater than the transition speed when the fault is detected,
wherein the transition speed is one of a fixed predetermined speed and an adjusted predetermined speed.
11. A machine-readable medium comprising sets of instructions operable in a controller to cause the controller to perform operations comprising:
applying an open-circuit response to a multi-phase inverter when a speed signal from a sensor indicates that a speed of a pm motor is greater less than a transition speed when a fault is detected; and
applying a short-circuit response to the multi-phase inverter when the speed signal indicates that the speed of the pm motor is less greater than the transition speed when the fault is detected,
wherein the transition speed is one of a fixed predetermined speed and an adjusted predetermined speed.
6. An apparatus comprising:
a multi-phase inverter;
a fault detector to indicate a detection of a fault;
a sensor to provide a speed signal indicative of whether a speed of a pm motor is greater than a transition speed; and
a controller operable to apply an open-circuit response to the multi-phase inverter when the speed of the pm motor is greater less than the transition speed and a fault is detected, and additionally operable to apply a short-circuit response to the multi-phase inverter when the speed of the pm motor is less greater than the transition speed and the fault is detected, wherein the transition speed is one of a fixed predetermined speed and an adjusted predetermined speed.
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12. A machine-readable medium according to
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15. A machine-readable medium according to
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The present invention relates to permanent magnetic motor drives. In particular, the invention relates to procedures in such drives for handling faults when detected.
Three-phase voltage inverters are commonly employed to the control the magnitude and frequency of the motor phase currents in hybrid vehicles (including electric and fuel cell powered). When the ac motor used is of the class of interior permanent magnet (IPM) type, the reaction of the system to various inverter based faults is of concern since the fault may cause an uncontrolled breaking torque in the motor.
Drive system faults can be classified as short-circuit type faults and open-circuit type faults. The behavior of various faults in permanent magnetic motor drives has been reported in the literature for many years. Modeling and system behavior of short-circuit type faults are described in B. A. Welchko, T. M. Jahns, W. L. Soong, and J. M. Nagashima, “IPM synchronous machine drive response to symmetrical and asymmetrical short circuit faults,” IEEE Trans. Energy Conversion, vol. 18, no. 2, pp. 291-298. June 2003.
For inverter driven IPM motors, an important class of open-circuit type faults results when the control gate signals to all of the six inverter switches are turned off, or disconnected. During this condition, the motor is connected to the dc source (e.g., battery, fuel cell, etc.) via the antiparallel diodes of the inverter switches. The antiparallel diodes create a potential path for current to flow which is dependant upon the motor operating condition and dc source voltage. The fault condition where the six gate signals have been turned off has been termed an uncontrolled generator mode (UCG mode) of operation since the motor would operate during the condition as a generator converting rotational power into electric currents. Modeling and system behavior during UCG mode operation is characterized in T. M. Jahns and V. Caliskan, “Uncontrolled Generator Operation of Interior PM Synchronous Machines Following High-Speed Inverter Shutdown,” IEEE Trans. Industry Applications, vol. 35, no. 6, pp. 1347-1357, Nov./Dec. 1999.
In a method example of the invention, a method for controlling a multi-phase inverter of a PM motor includes detecting a fault, sensing whether a speed signal indicates that a speed of the PM motor is greater than a transition speed, and applying either an open-circuit or a short circuit response. The open-circuit response is applied when the speed of the PM motor is greater less than the transition speed when the fault is detected, and applying a short-circuit response is applied when the speed signal indicates that the speed of the PM motor is less greater than the transition speed when the fault is detected. The transition speed is either a fixed predetermined speed or an adjusted predetermined speed.
In a first variant of the method embodiment, the applying the open-circuit response includes controlling all switches in the multi-phase inverter drive to be open.
In a second variant of the method embodiment, the applying the short-circuit response includes controlling selected switches in the multi-phase inverter drive to connect all phases of the multi-phase inverter to a single bus and controlling all other switches in the multi-phase inverter drive to be open.
In a third variant of the method embodiment, the transition speed is the fixed predetermined speed and is defined based on parameters characteristic of the PM motor.
In a fourth variant of the method embodiment, the transition speed is the adjusted predetermined speed and is defined based on parameters characteristic of the PM motor adjusted according to either a temperature of the PM motor, or a voltage of a voltage source, or both.
In an embodiment of an apparatus, the apparatus includes am a multi-phase inverter, a fault detector to indicate a detection of a fault, a sensor to provide a speed signal indicative of whether a speed of a PM motor is greater than a transition speed, and a controller. The controller is operable to apply an open-circuit response to the multi-phase inverter when the speed signal indicates that the speed of the PM motor is greater less than the transition speed and a fault is detected. The controller is additionally operable to apply a short-circuit response to the multi-phase inverter when the speed signal indicates that the speed of the PM motor is less greater than the transition speed and the fault is detected. The transition speed is either a fixed predetermined speed or an adjusted predetermined speed.
In a first variant of the apparatus embodiment, the application of the open-circuit response by the controller controls all switches in the multi-phase inverter to be open.
In a second variant of the apparatus embodiment, the application of the short-circuit response by the controller controls selected switches in the multi-phase inverter to connect all phases of the multi-phase inverter to a single bus and controls all other switches in the multi-phase inverter to be open.
In a third variant of the apparatus embodiment, the transition speed is the fixed predetermined speed and is defined based on parameters characteristic of the PM motor.
In a fourth variant of the apparatus embodiment, the transition speed is the adjusted predetermined speed and is defined based on parameters characteristic of the PM motor adjusted according to at least one of a temperature of the PM motor and a voltage of a voltage source.
In an embodiment of a machine-readable medium, the machine-readable medium includes sets of instructions operable in a controller to cause the controller to perform operations. The sets of instructions are operable to cause the controller to apply an open-circuit response to a multi-phase inverter when a speed signal from a sensor indicates that a speed of a PM motor is greater less than a transition speed when the fault is detected. The sets of instructions are further operable to cause the controller to apply a short-circuit response to the multi-phase inverter when the speed signal indicates that the speed of the PM motor is less greater than the transition speed when the fault is detected. The transition speed is either a fixed predetermined speed or an adjusted predetermined speed.
In a first variant of the machine-readable medium, the operator of applying the open-circuit response includes controlling all switches in the multi-phase inverter drive to be open.
In a second variant of the machine-readable medium, the operation of applying the short-circuit response includes controlling selected switches in the multi-phase inverter drive to connect all phases of the multi-phase inverter to a single bus and controlling all other switches in the multi-phase inverter drive to be open.
In a third variant of the machine-readable medium, the transition speed is the fixed predetermined speed and is defined based on parameters characteristic of the PM motor.
In a fourth variant of the machine-readable medium, the transition speed is the adjusted predetermined speed and is defined based on parameters characteristic of the PM motor adjusted according to at least one of a temperature of the PM motor and a voltage of a voltage source.
Having described preferred embodiments of a novel method, apparatus and media for handling faults of inverter driven PM motor drives (which are intended to be illustrative and not limiting), it is noted that modifications and variations can be made by persons skilled in the art in light of the above teachings. It is therefore to be understood that changes may be made in the particular embodiments of the invention disclosed which are within the scope of the invention as defined by the appended claims.
Having thus described the invention with the details and particularity required by the patent laws, what is claimed and desired protected by Letters Patent is set forth in the appended claims.
Conlon, Brendan M., Cawthorne, William R., Stancu, Constantin C., Hiti, Silva, Tang, David, Welchko, Brian, Rahman, Khwaja M., Huse, Jonathan B.
Patent | Priority | Assignee | Title |
10164563, | Apr 15 2016 | GM Global Technology Operations LLC | Method and apparatus for controlling an electric machine |
10320183, | Aug 10 2015 | GOODRICH ACTUATION SYSTEMS LIMITED | Control strategy of a dual lane fault tolerant permanent magnet motor to reduce drag torque under fault condition |
8575879, | Aug 19 2011 | GM Global Technology Operations LLC | Methods, systems and apparatus for controlling a multi-phase inverter |
8664901, | Feb 15 2012 | GM Global Technology Operations LLC | Method and system for estimating electrical angular speed of a permanent magnet machine |
9673744, | Aug 18 2011 | Robert Bosch GmbH | Operating state circuit for inverter and method for setting operating states of an inverter |
Patent | Priority | Assignee | Title |
5612629, | Mar 16 1992 | Lockheed Martin Corporation | System and method for detecting fault conditions in a direct current motor |
5670856, | Nov 07 1994 | AlliedSignal Inc. | Fault tolerant controller arrangement for electric motor driven apparatus |
5687049, | Jan 26 1996 | International Rectifier Corporation | Method and circuit for protecting power circuits against short circuit and over current faults |
5757599, | Jan 16 1996 | Converteam UK Ltd | Protection arrangement for a switching device |
5963706, | Oct 23 1997 | KANG, KI CHEOL | Control system for multi-phase brushless DC motor |
6118238, | Aug 26 1998 | Perfect Galaxy International Limited | Motor starting apparatus for an engine driven generator |
6239996, | Jan 24 2000 | Massachusetts Institute of Technology | Dual output alternator system |
6392418, | Sep 16 1999 | Steering Solutions IP Holding Corporation | Torque current comparison for current reasonableness diagnostics in a permanent magnet electric machine |
6476996, | Feb 15 2000 | Western Digital Technologies, Inc. | Disk drive comprising an actuator driver circuit for retracting a head independent of a servo microprocessor when a spindle speed fault mode is detected |
6694287, | Aug 30 2001 | Steering Solutions IP Holding Corporation | Phase angle diagnostics for sinusoidal controlled electric machine |
6741060, | Apr 05 2001 | DELPHI TECHNOLOGIES IP LIMITED | Method and system for controlling a permanent magnet machine during fault conditions |
6960918, | Jan 28 2003 | Delphi Technologies, Inc. | Method and apparatus for control and fault detection of a remote electrical motor |
7274243, | Apr 26 2004 | OILFIELD-ELECTRIC-MARINE, INC | Adaptive gate drive for switching devices of inverter |
7279862, | Aug 04 2006 | GM Global Technology Operations LLC | Fault handling of inverter driven PM motor drives |
7339803, | Apr 09 2004 | EATON INTELLIGENT POWER LIMITED | Inverter bridge short-circuit protection scheme |
7345383, | Nov 09 2005 | Mitsubushi Denki Kabushiki Kaisha | Abnormality detection apparatus for a power feed circuit |
7463139, | Oct 18 2004 | STMICROELECTRONICS INTERNATIONAL N V | Method and system for driving a vehicle trailer tow connector |
7545111, | Dec 22 2006 | FCA US LLC | Testing inverter driven electric motor shut-off path |
20020145837, | |||
20020176266, | |||
20030046028, | |||
20040024937, | |||
20040085787, | |||
20040145838, | |||
20050253165, | |||
20060044025, | |||
20060061923, | |||
20060245222, | |||
20070103006, | |||
20080129238, | |||
20080304189, | |||
20090059446, |
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