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WO2017177287A3 - Method for protecting an electric motor of a device with a motor driven consumer with a continuous capacity control system and choice of such a motor - Google Patents

Method for protecting an electric motor of a device with a motor driven consumer with a continuous capacity control system and choice of such a motor Download PDF

Info

Publication number
WO2017177287A3
WO2017177287A3 PCT/BE2017/000023 BE2017000023W WO2017177287A3 WO 2017177287 A3 WO2017177287 A3 WO 2017177287A3 BE 2017000023 W BE2017000023 W BE 2017000023W WO 2017177287 A3 WO2017177287 A3 WO 2017177287A3
Authority
WO
WIPO (PCT)
Prior art keywords
motor
protecting
choice
control system
capacity control
Prior art date
Application number
PCT/BE2017/000023
Other languages
French (fr)
Other versions
WO2017177287A2 (en
Inventor
Karel DE KEYSER
Original Assignee
Atlas Copco Airpower, Naamloze Vennootschap
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
Priority claimed from BE20165256A external-priority patent/BE1024061B9/en
Priority to EP17732017.3A priority Critical patent/EP3443630B1/en
Priority to BR112018071021-0A priority patent/BR112018071021B1/en
Priority to US16/091,343 priority patent/US10935016B2/en
Priority to CN201780023260.2A priority patent/CN109075563B/en
Priority to JP2018553998A priority patent/JP6940520B2/en
Application filed by Atlas Copco Airpower, Naamloze Vennootschap filed Critical Atlas Copco Airpower, Naamloze Vennootschap
Priority to RU2018139320A priority patent/RU2713457C1/en
Priority to EP22200593.6A priority patent/EP4138243A1/en
Priority to ES17732017T priority patent/ES2938438T3/en
Priority to KR1020187030459A priority patent/KR102297053B1/en
Publication of WO2017177287A2 publication Critical patent/WO2017177287A2/en
Publication of WO2017177287A3 publication Critical patent/WO2017177287A3/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity
    • 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
    • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
    • H02P29/60—Controlling or determining the temperature of the motor or of the drive
    • H02P29/64—Controlling or determining the temperature of the winding
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
    • F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/06—Cooling; Heating; Prevention of freezing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/20—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by changing the driving speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
    • F04B49/225—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves with throttling valves or valves varying the pump inlet opening or the outlet opening
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B51/00—Testing machines, pumps, or pumping installations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
    • F04D27/02—Surge control
    • F04D27/0261—Surge control by varying driving speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
    • F04D27/02—Surge control
    • F04D27/0292—Stop safety or alarm devices, e.g. stop-and-go control; Disposition of check-valves
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
    • H02H7/0852—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load directly responsive to abnormal temperature by using a temperature sensor
    • 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
    • H02K11/25—Devices for sensing temperature, or actuated thereby
    • 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
    • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
    • H02P29/02—Providing protection against overload without automatic interruption of supply
    • H02P29/032—Preventing damage to the motor, e.g. setting individual current limits for different drive conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2203/00—Motor parameters
    • F04B2203/02—Motor parameters of rotating electric motors
    • F04B2203/0201—Current
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2203/00—Motor parameters
    • F04B2203/02—Motor parameters of rotating electric motors
    • F04B2203/0202—Voltage
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2203/00—Motor parameters
    • F04B2203/02—Motor parameters of rotating electric motors
    • F04B2203/0205—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle
    • F25B1/04—Compression machines, plants or systems with non-reversible cycle with compressor of rotary type
    • F25B1/053—Compression machines, plants or systems with non-reversible cycle with compressor of rotary type of turbine type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/025—Compressor control by controlling speed
    • F25B2600/0253—Compressor control by controlling speed with variable speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2115—Temperatures of a compressor or the drive means therefor
    • F25B2700/21156—Temperatures of a compressor or the drive means therefor of the motor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/025—Motor control arrangements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/34—Testing dynamo-electric machines
    • G01R31/343—Testing dynamo-electric machines in operation
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B23/00—Testing or monitoring of control systems or parts thereof
    • G05B23/02—Electric testing or monitoring
    • G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
    • G05B23/0218—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterised by the fault detection method dealing with either existing or incipient faults
    • G05B23/0224—Process history based detection method, e.g. whereby history implies the availability of large amounts of data
    • G05B23/0227—Qualitative history assessment, whereby the type of data acted upon, e.g. waveforms, images or patterns, is not relevant, e.g. rule based assessment; if-then decisions
    • G05B23/0235—Qualitative history assessment, whereby the type of data acted upon, e.g. waveforms, images or patterns, is not relevant, e.g. rule based assessment; if-then decisions based on a comparison with predetermined threshold or range, e.g. "classical methods", carried out during normal operation; threshold adaptation or choice; when or how to compare with the threshold
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Control Of Direct Current Motors (AREA)
  • Control Of Electric Motors In General (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Abstract

Method for protecting an electric motor of a motor driven consumer equipped with a controller for controlling the capacity or the power of the consumer, characterised in that the method comprises the following steps: - the determination of the thermal condition of the motor by direct measurement on the motor; and - the limitation of the maximum capacity or the maximum power of the consumer as a function of the aforementioned determined thermal condition.
PCT/BE2017/000023 2016-04-12 2017-04-05 Method for protecting an electric motor of a device with a motor driven consumer with a continuous capacity control system and choice of such a motor WO2017177287A2 (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
KR1020187030459A KR102297053B1 (en) 2016-04-12 2017-04-05 Method for protecting an electric motor of a device with a motor driven consumer having a continuous capacity control system and selection of such a motor
BR112018071021-0A BR112018071021B1 (en) 2016-04-12 2017-04-05 METHOD AND DEVICE FOR PROTECTING AN ELECTRIC MOTOR AND METHOD FOR CHOOSING AN ELECTRIC MOTOR DURING DEVICE DESIGN
US16/091,343 US10935016B2 (en) 2016-04-12 2017-04-05 Method for protecting an electric motor of a device with a motor driven consumer with a continuous capacity control system and choice of such a motor
CN201780023260.2A CN109075563B (en) 2016-04-12 2017-04-05 Method for protecting an electric motor of an electric machine for driving the electric machine, and selection of an electric motor
JP2018553998A JP6940520B2 (en) 2016-04-12 2017-04-05 How to protect the motor of a device with a motor driven consumer with a continuous capacity control system and the choice of that motor
EP17732017.3A EP3443630B1 (en) 2016-04-12 2017-04-05 Method for protecting an electric motor of a device with a motor driven consumer with a continuous capacity control system and choice of such a motor
RU2018139320A RU2713457C1 (en) 2016-04-12 2017-04-05 Method for protection of electric motor of device with consumer having drive from engine, with system for continuous control of efficiency and selection of such engine
EP22200593.6A EP4138243A1 (en) 2016-04-12 2017-04-05 Method for protecting an electric motor of a device with a motor driven consumer with a continuous capacity control system and choice of such a motor
ES17732017T ES2938438T3 (en) 2016-04-12 2017-04-05 Procedure for protecting an electric motor of a device with a motor-driven consumer with a continuous capacity control system, and choice of such a motor

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
BE20165256A BE1024061B9 (en) 2016-04-12 2016-04-12 Method for protecting electric motors from compressors with a continuous capacity control system.
BE2016/5256 2016-04-12
BE2016/5824 2016-11-04
BE20165824A BE1024101B9 (en) 2016-04-12 2016-11-04 Method for protecting an electric motor of a device with a motor-driven consumer with a continuous capacity control system and selection of a motor for this.

Publications (2)

Publication Number Publication Date
WO2017177287A2 WO2017177287A2 (en) 2017-10-19
WO2017177287A3 true WO2017177287A3 (en) 2018-06-07

Family

ID=59101231

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/BE2017/000023 WO2017177287A2 (en) 2016-04-12 2017-04-05 Method for protecting an electric motor of a device with a motor driven consumer with a continuous capacity control system and choice of such a motor

Country Status (1)

Country Link
WO (1) WO2017177287A2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6406039B2 (en) * 2015-01-30 2018-10-17 株式会社デンソー Air conditioner
DE102018117262A1 (en) * 2018-07-17 2020-01-23 Ebm-Papst Mulfingen Gmbh & Co. Kg motor identification
DE102019131921A1 (en) * 2019-11-26 2021-05-27 Knorr-Bremse Systeme für Schienenfahrzeuge GmbH Compressor system for a rail vehicle and method for controlling a cooling device of a compressor system

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3585451A (en) * 1969-12-24 1971-06-15 Borg Warner Solid state motor overload protection system
DE4122002C1 (en) * 1991-07-03 1992-08-13 Voith Turbo Gmbh & Co Kg, 7180 Crailsheim, De
WO2000016464A2 (en) * 1998-07-15 2000-03-23 Lucas Aerospace Power Transmission Control system with integrated actuation package
DE29913196U1 (en) * 1999-07-28 2000-12-07 ebm Werke GmbH & Co., 74673 Mulfingen Electric motor with self-protection against overheating
WO2007008940A2 (en) * 2005-07-11 2007-01-18 Brooks Automation, Inc. Intelligent condition-monitoring and dault diagnostic system
WO2011040845A1 (en) * 2009-09-29 2011-04-07 Husqvarna Ab Electric motor and method for controlling the same
US20120101768A1 (en) * 2010-10-26 2012-04-26 General Electric Company Diagnosis of stator thermal anomalies in an electrical machine

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1172563B1 (en) 2000-06-23 2008-01-23 Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel Ltd.) Screw compressor for refrigerating apparatus
US7615951B2 (en) 2006-09-08 2009-11-10 Gm Global Technology Operations, Inc. Method and system for limiting the operating temperature of an electric motor
GB2452287B (en) 2007-08-29 2012-03-07 Gardner Denver Gmbh Improvements in compressors control
GB2478361B (en) 2010-03-05 2012-07-18 Protean Electric Ltd Method and apparatus for electric motor control

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3585451A (en) * 1969-12-24 1971-06-15 Borg Warner Solid state motor overload protection system
DE4122002C1 (en) * 1991-07-03 1992-08-13 Voith Turbo Gmbh & Co Kg, 7180 Crailsheim, De
WO2000016464A2 (en) * 1998-07-15 2000-03-23 Lucas Aerospace Power Transmission Control system with integrated actuation package
DE29913196U1 (en) * 1999-07-28 2000-12-07 ebm Werke GmbH & Co., 74673 Mulfingen Electric motor with self-protection against overheating
WO2007008940A2 (en) * 2005-07-11 2007-01-18 Brooks Automation, Inc. Intelligent condition-monitoring and dault diagnostic system
WO2011040845A1 (en) * 2009-09-29 2011-04-07 Husqvarna Ab Electric motor and method for controlling the same
US20120101768A1 (en) * 2010-10-26 2012-04-26 General Electric Company Diagnosis of stator thermal anomalies in an electrical machine

Also Published As

Publication number Publication date
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