US20070193794A1 - Vehicle for materials handling and other industrial uses - Google Patents

Vehicle for materials handling and other industrial uses Download PDF

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Publication number
US20070193794A1
US20070193794A1 US11682870 US68287007A US2007193794A1 US 20070193794 A1 US20070193794 A1 US 20070193794A1 US 11682870 US11682870 US 11682870 US 68287007 A US68287007 A US 68287007A US 2007193794 A1 US2007193794 A1 US 2007193794A1
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Prior art keywords
heavy
sr motor
vehicle
duty
motor
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Legal status (The legal status 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 status listed.)
Abandoned
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US11682870
Inventor
Ronald Johnston
Dwight Baker
Nelson Stoldt
Paul Schufeldt
Peter Bradley
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LeTourneau Technologies Inc
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LeTourneau Technologies Inc
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60KARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K6/00Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
    • B60K6/20Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
    • B60K6/22Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs
    • B60K6/26Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs characterised by the motors or the generators
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60KARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K17/00Arrangement or mounting of transmissions in vehicles
    • B60K17/34Arrangement or mounting of transmissions in vehicles for driving both front and rear wheels, e.g. four wheel drive vehicles
    • B60K17/356Arrangement or mounting of transmissions in vehicles for driving both front and rear wheels, e.g. four wheel drive vehicles having fluid or electric motor, for driving one or more wheels
    • BPERFORMING OPERATIONS; TRANSPORTING
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    • B60KARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K6/00Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
    • B60K6/20Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
    • B60K6/42Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by the architecture of the hybrid electric vehicle
    • B60K6/46Series type
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    • B60K7/00Disposition of motor in, or adjacent to, traction wheel
    • B60K7/0007Disposition of motor in, or adjacent to, traction wheel the motor being electric
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    • B60L1/00Supplying electric power to auxiliary equipment of vehicles
    • B60L1/003Supplying electric power to auxiliary equipment of vehicles to auxiliary motors, e.g. for pumps, compressors
    • BPERFORMING OPERATIONS; TRANSPORTING
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    • B60L11/00Electric propulsion with power supplied within the vehicle
    • B60L11/02Electric propulsion with power supplied within the vehicle using engine-driven generators
    • B60L11/06Electric propulsion with power supplied within the vehicle using engine-driven generators using ac generators and dc motors
    • BPERFORMING OPERATIONS; TRANSPORTING
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    • B60L15/00Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
    • B60L15/20Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
    • B60L15/2009Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed for braking
    • B60L15/2018Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed for braking for braking on a slope
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    • B60LELECTRIC EQUIPMENT OR PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES, IN GENERAL
    • B60L3/00Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration, power consumption
    • B60L3/0023Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
    • B60L3/0038Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to sensors
    • BPERFORMING OPERATIONS; TRANSPORTING
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    • B60L3/00Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration, power consumption
    • B60L3/0023Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
    • B60L3/0061Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electrical machines
    • BPERFORMING OPERATIONS; TRANSPORTING
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    • B60L3/00Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration, power consumption
    • B60L3/04Cutting off the power supply under fault conditions
    • BPERFORMING OPERATIONS; TRANSPORTING
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    • B60L7/00Electrodynamic brake systems for vehicles in general
    • B60L7/02Dynamic electric resistor braking
    • B60L7/06Dynamic electric resistor braking for vehicles propelled by ac motors
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00Conjoint control of vehicle sub-units of different type or different function
    • B60W10/04Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B60W10/08Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of electric propulsion units, e.g. motors or generators
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66CCRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C13/00Other constructional features or details
    • B66C13/18Control systems or devices
    • B66C13/22Control systems or devices for electric drives
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02FDREDGING; SOIL-SHIFTING
    • E02F3/00Dredgers; Soil-shifting machines
    • E02F3/04Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/34Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with bucket-arms, i.e. a pair of arms, e.g. manufacturing processes, form, geometry, material of bucket-arms directly pivoted on the frames of tractors or self-propelled machines
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02FDREDGING; SOIL-SHIFTING
    • E02F9/00Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20Drives; Control devices
    • E02F9/2058Electric or electro-mechanical or mechanical control devices of vehicle sub-units
    • E02F9/2062Control of propulsion units
    • E02F9/207Control of propulsion units of the type electric propulsion units, e.g. electric motors or generators
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02PCONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P25/00Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/02Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
    • H02P25/08Reluctance motors
    • H02P25/092Converters specially adapted for controlling reluctance motors
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    • B60K1/00Arrangement or mounting of electrical propulsion units
    • B60K1/02Arrangement or mounting of electrical propulsion units comprising more than one electric motor
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    • B60K17/00Arrangement or mounting of transmissions in vehicles
    • B60K17/04Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing
    • B60K17/043Transmission unit disposed in on near the vehicle wheel, or between the differential gear unit and the wheel
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    • B60K2007/0092Disposition of motor in, or adjacent to, traction wheel the motor axle being coaxial to the wheel axle
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    • YGENERAL 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
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    • YGENERAL 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
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    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/64Electric machine technologies for applications in electromobilty
    • Y02T10/641Electric machine technologies for applications in electromobilty characterised by aspects of the electric machine
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/64Electric machine technologies for applications in electromobilty
    • Y02T10/642Control strategies of electric machines for automotive applications
    • Y02T10/644Control strategies for ac machines other than vector control
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/64Electric machine technologies for applications in electromobilty
    • Y02T10/642Control strategies of electric machines for automotive applications
    • Y02T10/645Control strategies for dc machines
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/70Energy storage for electromobility
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/70Energy storage for electromobility
    • Y02T10/7072Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • Y02T10/7077Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors on board the vehicle
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/72Electric energy management in electromobility
    • Y02T10/7208Electric power conversion within the vehicle
    • Y02T10/7241DC to AC or AC to DC power conversion
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/72Electric energy management in electromobility
    • Y02T10/7258Optimisation of vehicle performance
    • Y02T10/7275Desired performance achievement

Abstract

A heavy duty wheeled vehicle for an industrial environment is electrically driven by one or more switched reluctance motor traction drive system connected to the wheels. The switched reluctance motors are powered by an electrical generator that is driven by an engine, such as a diesel engine, which may run at a substantially constant RPM. A digital control system provides operator displays and controls power conversion from the generator, as well as providing maintenance and control functions for the switched reluctance motors. A heavy-duty hoisting apparatus electrically drives a hoisting mechanism using an SR motor, providing power for lifting a load. The heavy-duty hoisting apparatus may include an engine and generator or provide power to the SR motor from an external source.

Description

    BACKGROUND OF THE INVENTION
  • 1. Field of the Invention
  • The present invention relates to a system for electrically driving a heavy-duty materials handling apparatus, and in particular to a system for using a switched reluctance motor for electrically driving one or more wheels of a heavy-duty industrial materials handling vehicle, or a vehicle for other industrial applications.
  • 2. Description of the Related Art
  • Mining, earth-moving, forestry, construction, and transportation industries, among others, use large, heavy-duty equipment for handling various types of materials, in various forms ranging from loose material, such as dirt or rocks, to large heavy objects, such as containers. The materials handling equipment may be self-propelled mobile vehicles or stationary equipment. An example of a heavy-duty materials handling mobile vehicle is a loader, commonly used in the mining industry for scooping up loose material and transporting the material to a truck for transport. An example of a stationary material handler is a jib crane used for log stacking. Numerous other forms of heavy-duty materials handling equipment are known, such as wheel dozers, stackers, straddle hoist cranes, and side porters. The mobile vehicles are typically off-road rubber-tired vehicles, where “rubber” is the commonly used name for various elastomeric materials used for tires, without limiting those tires to ones that contain natural rubber. Other forms of heavy-duty industrial vehicles include locomotives.
  • Historically, such rubber-tired heavy-duty equipment used diesel engines, with mechanical drive systems or transmissions, and gearing to drive the wheels of the vehicles. However, approximately fifty years ago, Le Toumeau, Inc., the assignee of the present invention, introduced electric drive systems to replace the mechanical drive systems.
  • The advantages of an electric drive system over the conventional drive have been proven by years of successful service of log stackers, front-end loaders, haul trucks and other heavy-duty material and container handling equipment.
  • In conventional electric drive machines, the utilization of solid-state power conversion and control, coupled with digital management gives additional advantages, such as reliability and ease of maintenance.
  • Digital control and management modules of conventional electric drive machines keep track of all the machine systems, producing controls for the electrical and hydraulic systems, commands for the engine and traction systems, and feedback, history and status information for all the systems. A display screen and keypad control may allow automatic and requested information to be displayed for a vehicle operator.
  • However, conventional electric drive systems have their own disadvantages, frequently related to the complexity of manufacture, operation, and maintenance of the electric traction drive motors, which conventionally have been alternating current (AC) or direct current (DC) motors.
  • Switched reluctance (SR) motor technology is also well known. Switched Reluctance Drives Ltd. of Harrogate, United Kingdom has developed multiple designs of SR motors or drives for various applications, including a 400 HP SR motor for a conveyor belt in a mining operation. In so far as known, however, there has been no application of SR motors to wheel-driven technology for large industrial or off-road vehicles, which present special problems in acceleration and deceleration as well as over-all control because of the size and weight of such vehicles, or for large industrial hoisting equipment, which present special problems in hoisting control because of the weight of material being hoisted.
  • SUMMARY OF THE INVENTION
  • A heavy-duty vehicle adapted for use in an industrial environment comprises a heavy-duty vehicle frame; a plurality of wheels mounted with the vehicle frame, each of the wheels adapted for engagement with a surface such as land; an engine mounted with the vehicle frame; an electrical generator operatively engaged with and driven by the engine; a first switched reluctance (SR) motor operably engaging a first wheel of the plurality of wheels, the first SR motor powered by the electrical generator; and a digital control system coupled to the SR motor for controlling the SR motor individually, and for driving the vehicle. In one embodiment, a heavy-duty materials handling system is mounted with the vehicle frame. In one embodiment, a single SR motor may drive multiple wheels of the vehicle. In another embodiment, multiple SR motors may be used, each driving individual wheels of the vehicle.
  • A heavy-duty hoisting apparatus adapted for use in an industrial environment comprises a heavy-duty frame, a heavy-duty lifting apparatus, mounted with the frame, an SR motor operably engaging the heavy-duty lifting apparatus, and a digital control system coupled to the SR motor for controlling the SR motor individually, and for lifting objects with the heavy-duty lifting apparatus and for controlling the hoisting apparatus.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • A better understanding of the present invention can be obtained when the following detailed description of the disclosed embodiments is considered in conjunction with the following drawings, in which:
  • FIG. 1 is an end view illustrating an exemplary prior art switched reluctance (SR) motor;
  • FIG. 2 is a drawing of a rotor of an exemplary SR motor for a disclosed heavy-duty vehicle of an embodiment;
  • FIG. 3 is a view of a stator of the exemplary SR motor of FIG. 2;
  • FIGS. 4-10 are schematics illustrating energizing and deenergizing poles in an exemplary prior art SR motor, causing the rotor to rotate;
  • FIG. 11 is a block diagram of an exemplary SR motor system for a disclosed heavy-duty vehicle of an embodiment;
  • FIGS. 12 a-12 c are three views of a power converter module of an exemplary SR motor system of an embodiment;
  • FIG. 13 is a photograph of a power converter cabinet illustrating the power converter modules of FIG. 12 a-12 c as installed in an embodiment;
  • FIG. 14 is a photograph of an exemplary operator interface of a heavy-duty vehicle of an embodiment;
  • FIG. 15 is a view illustrating an exemplary SR motor traction drive system for an embodiment in a propelling mode;
  • FIG. 16 is a view illustrating the SR motor traction drive system of FIG. 15 in a braking mode;
  • FIG. 17 is an exploded view illustrating an SR motor for disclosed heavy-duty vehicle of an embodiment;
  • FIG. 18 is a block diagram illustrating a distributed control system for a heavy-duty materials handling system of an embodiment;
  • FIG. 19 is a photograph illustrating an electrical control cabinet for an embodiment of a heavy-duty materials handling system;
  • FIG. 20 is a block diagram illustrating SR power flow in an embodiment;
  • FIG. 21 is an end view exemplary SR motor and stator frame assembly of an embodiment;
  • FIG. 22 is an end view of the other end of the SR motor rotor and frame assembly of FIG. 21;
  • FIGS. 23 a-23 b are photographs of two views of a power converter assembly for an SR motor of an embodiment;
  • FIG. 24 a is a view of an exemplary winding coil wrapped for an SR motor of an embodiment;
  • FIG. 24 b is a view of the coil of FIG. 24 a prior to wrapping;
  • FIG. 24 c is a cross-section view of the coil of FIG. 24 a;
  • FIG. 25 is a schematic illustrating a power converter and motor according to an embodiment;
  • FIG. 26 is a block diagram illustrating basic logic and signal flow of an SR motor control system of an embodiment;
  • FIG. 27 a-27 c are views of a phase ring for providing electrical connections to the winding coils of an SR motor of an embodiment; and
  • FIG. 28 is a block diagram of an exemplary SR motor system for a heavy-duty hoisting apparatus.
  • DETAILED DESCRIPTION OF THE INVENTION
  • Turning now to FIG. 11, an SR motor system for driving a wheel of an embodiment of a heavy-duty vehicle adapted for an industrial environment is shown. As used herein, “industrial environments” includes applications of such a vehicle in the mining, earth-moving, forestry, construction, and transportation industries, but excludes consumer vehicles. Examples of such vehicles include loaders, wheel dozers, stackers, crash cranes, straddle hoist cranes, locomotives, and side porters. An SR motor system 1100 as shown in FIG. 11 includes an SR motor 1110, power electronics 1120, a DC link capacitor 1140, signal level controls 1130, as well as an interface 1190 to a control system. The SR motor 1110 may be a heavy duty three phase SR motor with 12 stator poles and eight rotor poles, as shown in FIGS. 2 and 3. The power electronics 1120 provides the switches and diodes 460 and 470 as described below to energize and deenergize the stator poles of the SR motor 1110, causing the rotor of the SR motor to rotate, driving the wheel of the heavy-duty vehicle. The use of the DC link capacitor is described below when describing the operation of a typical SR motor. Signal level controls 1130 provide circuitry for determining the rotational position of the rotor of the SR motor 1110 and generate appropriate gating signals to the power electronics 1120 switches. A sensorless technique for determining rotor rotational position may be used, avoiding the need for sensors for detecting such rotational position, which reduces maintenance issues caused by sensor failure. However, the SR motor 1110 may alternatively use sensors and/or an encoder 1135 (shown in dotted lines in FIG. 11) instead of a sensorless encoding technique. For electromechanical reasons, the power electronics 1120 may not switch full power to the stator poles immediately; thus, the signal level controls 1130 may time and control the signal levels such that stator pole windings of the SR motor 1110 receive a ramped power level, avoiding undesirable torqueing effects in the rotor of the SR motor 1110.
  • As shown in FIG. 11, the SR motor 1110 mechanically drives a wheel (not shown) of the heavy-duty vehicle through a mechanical brake 1170 and a gearbox 1180. The gearbox 1180 is typically a multiple-reduction type gear configured for the size and operating weight and speed characteristics of the heavy-duty vehicle, gearing down the output of the motor system 1100. In an exemplary embodiment, rotation of the SR motor 1110 is reversed to reverse the vehicle. In other embodiments, reversing may be accomplished by gearing or other mechanical linkage changes, without changing the rotation of the SR motor 1110. The mechanical brake 1170 is typically a disc brake.
  • A rectifier, typically a diode bridge rectifier, and soft start control 1150 rectifies AC voltage from a three phase AC generator supply 1155 to DC voltage for use with the SR motor 1110, creating a DC bus 1157. Although generally described herein using an AC generator, in some embodiments, other types of generators may be used, such as DC generators and SR generators. In embodiments in which generators are used that produce DC voltage, the rectifier 1150 may not be needed.
  • As shown in FIG. 11, a braking control 1160 allows shedding of excess energy of the SR motor during braking. When braking, the SR motor 1110 feeds back excess electrical energy, effectively becoming a generator. In one embodiment, this excess energy is converted to heat by a resistor grid 1167, dissipating the heat into the atmosphere.
  • A chopper circuit 1165 may turn on when an increase of DC bus 1157 voltage is detected. When the system goes into a braking mode, power may be regenerated to the DC bus 1157, causing an increase of DC bus 1157 voltage unless that energy is dumped. The chopper dumps that energy to the braking grids 1167, as shown in FIG. 11.
  • The machine control interface 1190 allows control of the SR motor system 1100 by a distributed control system, as described in more detail below.
  • The rectifier circuit 1150 and chopper circuit 1160 are described in more detail below.
  • FIG. 20 illustrates the power flow in an embodiment of a heavy-duty vehicle using an SR motor system similar to the SR motor system 1100 illustrated in FIG. 11. An engine 2001, typically a diesel engine, mechanically drives an AC generator 2002. In FIG. 20, solid lines denote power flow from the generator 2002, through a diode bridge 2003, creating a DC bus 2004, and through an SR converter assembly 2005 to traction wheel motors 1890, corresponding to the SR motor 1110 of FIG. 11. Dotted lines denote the reversal of power flow from the wheel motors 1890, back through the SR converter 2005 to the DC bus 2004, and through a chopper 2007 to the respective braking grids 2008 when the vehicle goes into braking, corresponding to the braking control 1160 of FIG. 11.
  • The diesel engine 2001 is the prime power source, and is typically mechanically coupled directly to the AC generator 2002. A battery bank 2009 is typically four 12-volt lead-acid batteries connected in series/parallel to provide a 24-volt source for engine starting, generator priming, lighting, etc. Other batteries may be used. A separate alternator 2010, driven from the engine 2001, maintains the charge on the batteries 2009, as in an automotive system.
  • In an exemplary embodiment, an engine select switch in a cab of the vehicle controls engine speed. A high throttle position brings the engine speed to a predetermined operating speed, typically chosen based on engine characteristics to provide maximum engine efficiency and minimize environmental pollution. For example, in an L1350 loader from LeTourneau, Inc., the engine is typically run at 1980 RPM. With high throttle activated, battery power is fed through the voltage regulator 2011 to prime the field 2012 of the AC generator 2002.
  • As the AC voltage rises, the voltage regulator (VR) 2011 begins functioning and takes over the generator field regulation, controlling current in the field 2012 so that the generator voltages are maintained within specified limits during normal operating conditions.
  • The AC generator 2002 is typically a three-phase alternator with wye connected output windings, producing a main voltage. A nominal output of the AC generator 2002 may be 500 VAC at 66 Hz. Other generator types and output ratings may be used, as desired.
  • The main voltage is fed to a transformer/detector card 1940 located near the AC fuse assembly 1950 as illustrated in FIG. 19. This card may divide the high voltage signal across each fuse to control signal levels that are used for blown fuse detection. This card may also contain a three-phase transformer that reduces the main voltage to VAC signals used to detect the timing relationships of the three-phase system. Some embodiments use 28 VAC signals. These reduced VAC signals are sent to the drive modules 1860. In an embodiment illustrated in FIG. 18, drive module number 4 (1860 d) is used to control the VR converter 1880, so these transformer signals are used there to set up the VR SCR firing. The voltage regulator 2011 regulates the generator field 2012 current to maintain a constant main voltage, regardless of the generator load.
  • The diode bridge 2003 puts power into the DC bus 2004 to establish a source for SR phase current. In motoring mode, power is taken from the bus 2004 to energize the respective phase stator poles to attract the rotor, and then to the next pole and so forth to provide a rotating attraction for the rotor to “chase,” as described below in FIGS. 4-10. In the braking mode, the “rotation” of the stator poles “chases” the rotor to retard its rotation. This puts energy on the bus 2004 from the motors 1890, causing each motor 1890 to act as a generator. This will cause the bus voltage to increase. As the bus voltage increases, the chopper control turns on the chopper 2007, dumping the excess energy to the braking grids 2008, as described in more detail below.
  • The power flow of FIG. 20 is controlled by a distributed control system, using the machine interface 1190 of FIG. 11, as described below with respect to FIGS. 18 and 26.
  • A switched reluctance (SR) motor is a third type of electric motor, in addition to AC and DC motors. The SR motor utilizes electromagnetic principles to produce torque on a rotor of the motor. As illustrated in FIG. 1, an SR motor 100 has a rotor 110 that has no magnets or windings of any kind and is effectively a stack of shaped, laminated iron pieces, creating an arrangement of poles 115. The SR motor 100 also has a stator 120, where the stator 120 has poles 125, each of which is magnetized by a coil or winding 130, similar to a field of a DC motor. As the stator pole winding 130 is energized, a magnetic force is generated and one of the rotor poles 115 will rotate into alignment with that stator pole 125.
  • In an SR motor, rotation is achieved with the sequential energizing of stator poles. This energizing creates magnetic field flux, which is a function of the current through the winding and the characteristics of the iron. The rotor will follow the sequencing, trying to align with energized stator pole. However, as alignment is almost achieved, that pole turns off as the next pole comes on. The SR motor makes rotation continuous by turning on the next pole before the previous one is turned off. This consecutive switching of the stator pole currents ensures the poles on the rotor are continually chasing the flux. The torque is achieved by creating flux, which is a function of the current through the winding and the characteristics of the iron. Although some SR motors use sensors to detect the position of the rotor, sensorless technology has been developed so the position of the rotor can be determined without external sensors, which can fail.
  • FIG. 2 is a drawing of a rotor 200 for an SR motor of an exemplary heavy-duty materials handling system. The middle section 210 of the rotor 200 is typically comprised of a stack of laminated cross-sections (“lams”) for minimize eddy current losses. The number of lams in the rotor 200 is determined by the desired operating parameters for the SR motor, such as the horsepower of the motor. As shown in FIG. 2, the rotor 200 has eight poles 220.
  • FIG. 3 is a photograph of an exemplary stator 300 for use with the rotor 200 of FIG. 2. As shown in FIG. 3, the stator 300 has 12 poles 310, creating a three-phase SR motor. Winding coils, which in an operational stator 300 would surround each of the stator poles 310 are not shown in FIG. 3.
  • One skilled in the art will recognize that various numbers of rotor and stator poles can be used, depending on desired operating characteristics. In addition, the size of the SR motor, number of lams, size of lams, and other motor design characteristics vary depending on desired operational characteristics. Various companies can provide SR motor designs based on supplied desired SR motor characteristics. One such company is Switched Reluctance Drives Ltd. (SRDL) of Harrogate, United Kingdom.
  • FIGS. 4-10 illustrate the way in which successive energizing and deenergizing of the poles of an SR motor 400, such as the SR motors 1110 of FIG. 11, cause rotation of a rotor 420 of the SR motor 400. The schematics of FIGS. 4-10 are simplified for clarity of the drawing, and do not show, for example, control circuitry either for turning off and on switches 460 a-460 f, which in disclosed embodiments is provided by the distributed control system. As shown for clarity of the drawing in FIGS. 4-10, the SR motor 400, shown in cross section, has a stator 410, with six stator poles 440 a-440 f, and a rotor 420 with four rotor poles 430 a-430 d. Circuitry 450 provides electrical voltage to the windings (not shown) to energize the stator poles 440 a-440 f. The winding or coils for the stator poles 440 are wound in parallel such that two north and two south poles are created for each phase. Magnetic flux travels between poles, creating torque to align a stator 410 and rotor poles. Since the rotor poles have one section less than the stator 410, as one set lines up, another is in a position to be pulled toward the next energized stator pole coil.
  • As shown in FIG. 4-10, the power circuits for each phase of the three-phase SR motor comprise two switches 460 and two diodes 470, one for each pair of stator poles 440 a-440 f, plus a capacitor 480, corresponding to the DC link capacitor 1140 of FIG. 11. Such circuits are well known in the art.
  • Turning to FIG. 4, one phase of the SR motor 400 begins by switching on switches 460 a and 460 b, allowing voltage to energize stator poles 440 e and 440 b. The other stator poles 440 a, 440 c, 440 d, and 440 f are deenergized. This causes the rotor 420 to rotate so that rotor poles 430 b and 430 d come into alignment with stator poles 440 e and 440 b. Then, as shown in FIG. 5, once rotor poles 430 b and 430 d align with stator poles 440 b and 440 e, the switches 460 a and 460 b are turned off, allowing energy to freewheel through the diodes 470 a and 470 b. The capacitor 480 can then store some of the electrical energy from the coils for later use. Use of the capacitor 480 serves as a storage and power factor correction device, decreasing the reactive power required from and thus the size of the AC generator 2002 needed for the heavy-duty vehicle, as compared to DC motor systems. Switches 460 c and 460 d are also turned on, energizing poles 440 a and 440 d, for a second phase of the SR motor 400.
  • As illustrated in FIG. 6, the rotor 420 therefore rotates further, as rotor poles 430 a and 430 c begin to align with stator poles 440 a and 440 d. Then, as illustrated in FIG. 7, phase 2 finishes by switching off switches 460 c and 460 d when rotor poles 430 a and 430 c align with stator poles 440 a and 440 d, allowing coil energy to freewheel through diodes 470 c and 470 d. Stator poles 440 c and 440 f are also energized by switching current through switches 460 e and 460 f, beginning the third phase, causing the rotor 420 to rotate further, as rotor poles 430 d and 430 b are attracted to stator poles 440 c and 440 f, as shown in FIG. 8.
  • When rotor poles 430 d and 430 b align with stator poles 440, switches 460 e and 460 f turn off in FIG. 9, allowing coil energy to freewheel through diodes 470 e and 470 f, finishing phase three. Phase one then repeats in FIG. 10, switching on switches 460 a and 460 b, energizing stator poles 440 b and 440 e, this time causing rotor 420 to further rotate by attracting rotor poles 430 a and 430 c.
  • Although FIGS. 4-10 illustrate a 6 stator pole, 4 rotor pole, three-phase SR motor 400, one skilled in the art will recognize that other phase and pole numbers can be used. One disclosed embodiment uses a 12×8 arrangement, indicating twelve stator poles and eight rotor poles. The switches 460 of FIGS. 4-10 may be insulated gate bipolar transistors (IGBTs), gate turnoff transistors (GTOs), or other forms of switches known in the art. High current, high voltage IGBTs allow high speed switching with a small gate signal in a relatively small space, with desirable heating characteristics.
  • The use of switched reluctance technology in heavy-duty materials handling equipment, such as illustrated in FIGS. 11 and 20, has been made possible by today's high-power semiconductor switches and modern control techniques. One type of transistor switch that may be used to energize the stator coils is called the IGBT. IGBTs are now available in the current and voltage ratings needed for high horsepower applications such as heavy-duty materials handling equipment. The availability of these devices also paved the way for today's proliferation of AC drives. However, unlike AC drives, an SR drive has a stator pole coil in line with each IGBT. This system impedance gives more capability to control any type of system fault. Therefore, the “shoot-through” fault possible in AC systems is unlikely to occur, resulting in a much more robust drive. In addition, the generally lower switching frequencies in a SR motor system may result in a more efficient drive for heavy-duty materials handling equipment.
  • FIGS. 12 a-12 c illustrate three views of a physical layout of power converter module 1200 for one SR motor of an exemplary heavy-duty vehicle, corresponding to the power electronics 1120, rectifier 1150, and chopper 1160 of FIG. 11. FIGS. 23 a-23 b are photographs showing two additional views of the power converter module 1200, illustrating some of the wiring connections. The module 1200 includes three sections of the capacitor bank 480 and two IGBT and diode components 460 a, 460 b, 470 a, 470 b as indicated in FIG. 4, corresponding to each of the three phases of the SR motor, plus a similar section that has one IGBT for chopping and one diode bridge for rectification. In FIG. 12 a, a top view of the module 1200 shows the DC bus 1210, corresponding to the DC bus 1157 of FIG. 11. Seven IGBTs 1220 are mounted as shown (six for the three phases of the SR motor, and one for chopping), as well as the diode bridge circuit 1230. A pair of interface boards 1240 provides connectivity to drive remote modules of a digital control system, as described below. The entire assembly may be mounted in a rack or tray 1250 for installation in the vehicle. Mounting the power converter module 1200 in a package on a tray, such as shown in FIGS. 23 a-23 b, simplifies manufacturing, installation, and maintenance of the converter electronics, which are typically very heavy.
  • FIG. 12 b is a front view of the module 1200 of FIG. 12 a. FIG. 12 c is a side view of the module 1200 of FIG. 12 a, viewing the module 1200 from a point of view of the left side of FIG. 12 a. In this view, the banks of capacitors 1260, previously hidden by the DC bus bars 1210, can be seen.
  • FIG. 13 illustrates a disclosed embodiment of a converter cabinet 1300 containing power converter modules 1200 for four motors of an exemplary heavy-duty vehicle, in this case a loader. Other configurations and layouts of the power converter modules can be used as convenient.
  • The operator of a heavy-duty vehicle typically uses an operator interface to control the vehicle. In an exemplary embodiment shown in FIG. 14, an operator's cab 1400 provides an operator chair 1410.
  • The illustrated embodiment of FIG. 14 is for a loader. Two joysticks 1420 a and 1420 b provide controls for signaling the vehicle to go forward, backward, etc., as well as control for movement of the bucket of the loader. Other operator controls may be used, such as levers, switches, foot pedals, steering wheels, etc. Operator displays 1430 provide visual feedback of vehicle operations to the operator. Panel 1435 displays normal gauge devices, such as a speedometer. The operator displays 1430 may also display maintenance information as desired. Multiple types of graphical, textual, and analog displays may be used as convenient. In addition, a control panel 1440 may provide a security key 1450 and a keypad 1460 for entering data, as well as indicator lights and audible alarms.
  • Turning to FIG. 15, an illustration shows the use of four SR motor and drive assemblies in a loader 1500. Although shown in a loader, similar configurations may be used for other forms of heavy-duty mobile vehicles, such as wheel dozers, stackers, crash cranes, straddle hoist cranes, and side porters. As shown in FIG. 15, four SR motors/drivers 1510 a-1510 d separately drive wheels 1515 a-1515 d. However, a single SR motor assembly may be used to drive multiple wheels, as convenient. In such a multi-wheel, single motor configuration, a differential or other conventional technique for mechanically driving multiple wheels from a common drive source may be used. In some embodiments, some of the wheels may not be driven, e.g., two wheels may be driven and two wheels may be undriven. The power converter cabinet 1300, as shown in FIG. 13, provides the power conversion electronics 1120. A master control module 1540 (corresponding to the master control module 1810 of FIG. 18) controls the operator interface 1530, such as the operator interface 1400 of FIG. 14, as well as controlling the power converters 1300 and other electronics for the motors 1510 a-1510 d. As shown in FIG. 15, each wheel 1515 a-1515 d of the vehicle 1500 uses a rubber tire for traction with a surface, such as land, as with conventional heavy-duty vehicles.
  • FIG. 15 further illustrates the use of a materials handling system 1540, such as the bucket or scoop of the loader 1500. In some embodiments, the scoop is a hydraulically manipulated materials handling system, where hydraulic pressure is manipulated by mechanical linkages from the engine of the loader 1500. In other embodiments, the materials handling system hydraulics may be driven by another SR motor, similar to the SR motors 1510. In such embodiments, the digital control system described below may provide operational control of the materials handling system.
  • FIG. 16 illustrates power flow in the system 1500 when in braking mode, routing voltage to the generator 1520 and the braking grid 1610, as described above. Although typically the braking grid 1610 is an array of resistors, converting electrical energy into heat, other techniques may be used, as described below.
  • Propulsion power is typically required when the vehicle is operating on level or upwardly sloping surfaces. When operated on downwardly sloping surfaces, no propulsion power may be needed. Instead, the vehicle typically retards the downward progress of the vehicle. Friction brakes may not be suitable for this purpose, because they tend to wear out quickly due to the very large mass of the vehicle, especially when loaded. While friction or similar braking systems may provide the primary stopping system for such heavy-duty vehicles, many such vehicles employing DC wheel motors have used those motors to provide continuous retarding torque for traveling on a downward slope. By reversing the conventional DC motor field or armature current, a conventional DC motor may reverse torque direction and act as a DC generator, powered through the gearboxes of the vehicle wheels. Braking grids may be used to create a load, so that current generated by the DC motors is consumed by the resistors and dissipated as heat into the atmosphere. The amount of current consumed creates a corresponding load on the DC wheel motors, which is transmitted through the gearboxes to the drive wheels as retarding torque. However, an SR motor drive system 1100 does not depend on reversing a motor field or armature current, as in a conventional DC motor. The SR motor system embodiments disclosed herein use the braking control circuitry 1160 of FIG. 11 for such retarding purposes, as described below in more detail.
  • FIG. 17 is an exploded view of an SR motor assembly 1700 of an exemplary embodiment, such as used in the embodiment illustrated in FIGS. 15-16. As shown, rotor 1713 is supported by and rotates on bearings that are connected to a first end piece, commonly known as an end bell, 1711, and a second end bell 1723. A brake disc 1705 is connected to the rotor 1713 for mechanical braking of the motor assembly 1700. Although electrical braking by the SR motor drive system 1100 typically provides the primary braking, the disc brake 1705 may be used for backup or stationary braking purposes. The rotor 1713 is placed in the stator assembly 1718, and connected to a shell pinion 1727, for driving a conventional gearbox (not shown) on the wheel driven by the motor assembly 1700. The end bells 1711 and 1723 are bolted to the stator assembly 1718. In one embodiment, a labyrinth seal 1721 provides an oil seal for lubrication, preventing lubrication from contaminating the interior of the motor assembly 1700. Other types of seals may be used. FIGS. 21 and 22 illustrate the rotor 1713 assembled with the stator 1718 from each end. Unlike FIG. 3, where the stator was shown without the coil windings, FIGS. 21 and 22 show the poles of the stator 1718 surrounded by the coil windings. FIG. 21 further shows a phase ring 2110, as describe in detail below.
  • Although not shown in detail in FIG. 17 for clarity of the drawing, coils winding around the various stator poles of the stator 1718 must be connected to the DC bus 1157 and power electronics 1120 as shown in FIG. 11. A phase ring, such as shown in an exploded view in FIGS. 27 a-27 c may be used to route wiring from the power electronics 1120 to the coil windings, which otherwise is difficult to do, because of the large size of the wires necessary for such large electrical motors. In some embodiments, stator 1718 provides sufficient room for direct wiring of the coil windings to the power electronics.
  • In one embodiment, the SR motor system 1100 is integrated with a distributed control system such as the LINCS™ network from LeTourneau, Inc., which provides a complete machine control and monitoring system. The distributed control system, such as the system 1800 of FIG. 18, may manage all loader systems including hydraulics, electrics, drive system, and engine. As described below, the distributed control system 1800 features multiple microprocessor-based modules distributed throughout the machine that communicate over a Controller Area Network (CAN) network. However, one skilled in the art will recognize that other network protocols may be used. A master module 1810 directs the entire system and is located in the cab of the loader. Remote modules 1820 are located throughout the machine, each placed near the systems they control, monitor and manage. A translator module 1840 provides an interface to the engine 2001 and is able to “talk” to all intelligent engines, sending engine speed commands and receiving engine data. In one embodiment, the translator module may contain J1587, J1939, RS422, and R5232 communication ports. The translator module 1840 translates all engine input and output data to make it compatible with protocol used by the remainder of the distributed control system. The drive modules control the SR converters and VR converter.
  • FIG. 18 is a block diagram illustrating basic logic of a distributed control system 1800 for controlling a heavy-duty vehicle. Distributed control systems are known in the art, and have been used on vehicles for some time. One example of a digital distributed system is the LINCS™ system of LeTourneau, Inc., the assignee of the present invention. Other industrial manufacturers, such as Caterpillar, Inc, provide alternate distributed control systems.
  • In an embodiment such as shown in FIG. 18, a master module 1810 is connected to a collection of remote modules 1820 via a CAN bus 1805 as defined by international standard ISO 11898, a copy of which international standard is incorporated in its entirety herein for all purposes. The CAN standard was pioneered in the automotive industry and is used in industrial equipment markets. A CAN network provides the flexibility to handle large quantities of input/output (I/O), using multiple micro-controllers throughout a machine containing a CAN network. CAN is based on a so-called broadcast communication mechanism, using a message-oriented transmission protocol, where messages are identified by a message identifier, unique within the network, but not defining stations and station addresses. Hence, CAN networks can perform distributed process synchronization transmitting data via the network without the need for receiving stations to know the producer of the data. Although CAN message frames are defined by the ISO 11898 standard, the content of the data of those messages is not, and can be defined by the implementor. In one embodiment, the messages sent via the CAN network can be encrypted.
  • The master module 1810 may combine a microprocessor, such as a Pentium-class microprocessor with other industrial hardware, providing I/O capability for controlling multiple remote modules 1820. In one embodiment, up to 36 remote modules may be controlled from a master module 1810. Other embodiments may control differing numbers of remote modules 1820. The master module 1810 typically contains storage for software used by the master module 1810, as well as storage for software that is downloaded across the CAN bus 1805 to the remote modules 1820 and drive modules 1840. A real-time operating system (RTOS) typically controls the operation of the microprocessor of the master module. One skilled in the art will recognize that the master module 1810 can be constructed in numerous ways. For the industrial environment, the master module is typically ruggedized and protected from environmental contamination by an industrial housing.
  • The remote modules 1820 may contain a microcontroller or microprocessor, such as a 32-bit microcontroller, and numerous I/O points. Software for execution by the remote module 1820 may be downloaded from the master module 1810, providing a distributed processing system. The remote modules 1820 typically have ruggedized industrial housings for placing near the devices to be controlled. The master module 1810 and remote modules 1820 and software provide the machine interface 1190 shown in FIG. 11.
  • The remote modules 1820 can be used to control various components 1825, such as sensors, solenoids, thermostats, valves, lights, switches, transducers, frequency measurement units, and sending units. Other remote modules 1820 can control cab and operator controls 1830, such as shown in FIG. 14. For example, a fuel gauge in the cab may be controlled by one remote module 1820, with a sending unit in the diesel fuel tank generating fuel level data to a second remote module 1820, with no direct wiring between the fuel gauge and the fuel tank. A translator module 1850 can be used to translate between the messages used routinely by the distributed control system 1800 and another message format used by other units, such as an engine interface 1850 for an intelligent engine 1855 manufactured by another vendor. While remote modules 1820 are generally fungible, specialized remote modules, indicated as drive modules 1860 in FIG. 18, may provide additional functionality for controlling drive converter logics 1870 that control the motors 1890 that drive the wheels of the heavy-duty vehicle. One drive module 1860 may also control a voltage regulator 1880 coupled to the generator field 1895 of an AC generator. Other distributed control systems may be used. Although as described above, the distributed control system is a digital system, an analog control system may be used.
  • FIG. 19 shows one embodiment of a solid-state conversion system. The electrical control cabinet 1300 of FIG. 13 is shown in greater detail in FIG. 19, showing an exemplary physical layout of drive modules 1860, drive converter modules 1200, a voltage regulator silicon controlled rectifier (SCR) assembly 1910, and interface cards 1240. One skilled in the art will recognize that other physical layouts may be used.
  • FIG. 24 illustrates a coil or winding 2400 used in the stator of an SR motor according to an exemplary embodiment. In FIG. 24 a, the coil 2400 is shown with tape wrapped around the coil for insulation. The coil 2400 is typically made with insulated magnet wire, which has a generally square cross-section, as shown in the cross-section view of FIG. 24 c. In an exemplary embodiment, the coil 2400 is four layers of nine turns of wire with a crossover on lead ends 2410 of the wire. Mica mats may be used to level off the lead ends 2410. Mica mats and glass coil tape may also be used for taping the wound coil of FIG. 24 b to produce the fully taped coil 2450 of FIG. 24 a. A varnishing sleeve 2420 may be placed to protect the lead ends, as shown in FIGS. 24 a and 24 b. The wound coils 2450 are then installed around the stator poles in the stator assembly as shown in FIGS. 21-22. Once the wound coils 2450 are assembled into the stator assembly as shown in FIGS. 21-22, the entire stator assembly 1718 is then typically further insulated using a vacuum pressure impregnation (VPI) process, in which the stator assembly is flooded with epoxy resin under a vacuum, then the epoxy resin is pressurized to attempt to fill voids in the assembly 1718, finally baking the assembly to cure the epoxy. Use of such a VPI process helps eliminate destructive corona effects in voids, which are filled with the epoxy. In addition, the VPI process helps the coils 2450 adhere to the stator poles and provides a path for heat rejection.
  • FIG. 25 is a schematic illustrating a combined rectifier circuit 2500, corresponding to the diode bridge 2003 of FIG. 20, chopper circuit 2510, corresponding to the chopper 2007 of FIG. 20, and SR converter and motor 2520, corresponding to the SR converter assembly 2005 and motor 1890 of FIG. 20. The rectifier circuit 2500 uses a diode bridge rectifier 2505 to rectify three-phase AC power 2507 to DC, creating the DC bus 2004 of FIG. 20. One skilled in the art will recognize that other rectification circuits may be used. As described above, the chopper circuit 2510 dumps braking energy into the braking grids 2008.
  • In an exemplary embodiment, an active front end allows using the excess energy through the generator 2002 of FIG. 20 to overdrive the diesel engine 2001 that drives the AC generator 2002, reducing load on the diesel engine 2001. In another embodiment, a connection to a power grid may allow the vehicle to return excess energy to the power grid. Another embodiment may store electrical power on board the vehicle 1500, using batteries or other electrical storage techniques.
  • The SR Converter itself is shown in block 2520 of FIG. 25. It consists of a high side and low side switch on each phase, connected to the DC bus 2004. When a phase is energized, current flows from the positive side of the bus 2004, through the high side switch 2521, through the coil 2522, through the low side switch 2523 to the negative side of the bus 2004. In a power or motoring mode, the phases are energized just ahead of the rotor position so that the rotor is constantly “chasing” the energized stator pole. This requires that the control knows what the rotor position is. This is achieved without sensors using a sensorless calculating method. If the motor is turning slow enough, the “off” phase may be given fixed diagnostic pulses. The amplitude of the pulses may vary with the change in inductance as the rotor turns, giving position information. As speed increases, there may not be enough time to generate diagnostic pulses. In this case, the calculations may change and the rate of rise of current may be used to determine position. With position information, speed can also be measured, giving both position and speed data for proper gating of the IGBT switches 2521 and 2523. In the braking mode, the stator energizing sequence actually “chases” the rotor, trying to draw it back, thus creating the braking force. In both motoring and braking, the current through the IGBT switches 2521 and 2523 and the coil 2522 is in the same direction unlike a conventional DC motor. The timing of the turn on/off with respect to the rotor position creates motoring and braking.
  • An SR motor can be used for stationary braking of a heavy-duty vehicle. By energizing and maintaining the energy in one coil of the SR motor, instead of turning on/off the coil as described above, the rotor will be rotated to align poles of the rotor with the stator poles energized by the coils 2522, then will stay in that position, holding the rotor stationary without creating mechanical wear, such as in a disc brake system.
  • Some of the benefits of SR technology include: (a) the motor is more robust than an AC or DC motor, since there are no coils on any of the moving parts of the motor; (b) the rotor inertia is much lower than in a DC armature or an AC rotor, giving benefits to gearing life, especially if there is frequent stopping and starting; (c) no commutator maintenance—there are no brushes or brush rigging; (d) stators are very similar to DC motor field poles; (e) smaller than DC motors with comparable horsepower; (f) simple and robust electronic controls compared to variable frequency AC; (g) high level of fault tolerance; (h) high speeds can be achieved, limited only by bearing and electromagnetic timing constraints; (i) can operate at low speed providing full-rated torque down to zero speed; (j) maintains high efficiency over wide speed and load ranges; (k) system is inherently 4-quadrant and can run forward or backward as either a motor or generator; and (l) temperature sensitive components are stationary and therefore, easier to monitor. Other advantages may be found.
  • In one embodiment, such as shown above in FIG. 15, four SR traction motors 1510, one directly driving each wheel 1515, provide propulsion power for the vehicle 1500. By controlling the timing and magnitude of SR pole currents, the vehicle 1500 achieves an efficient and responsive tractive effort. Power for the traction system comes from a diesel driven AC generator 2002, as shown in FIG. 20. The diesel engine 2001 may run at a substantially constant predetermined speed, chosen for engine efficiency, and the AC generator provides a power input for the four SR converters and the generator field excitation VR converter as described in more detail below. Although a diesel engine is shown in FIG. 20, other types of engines may be used to drive the AC generator.
  • The SR converter 2520 utilizes IGBT switches 2521 and 2523 as its basic power switch. An IGBT switch is a transistor switch with tremendous power gain capabilities. A small amount of gate drive can turn on hundreds to thousands amperes of current, and when it is removed, current will turn off. Therefore, current through the motor coil 2522 can be precisely turned on and off, to provide optimum system performance. The current flows from the positive side of the bus 2004, through the high side switch 2521, through the stator coil 2522, through the low side switch 2523 to the negative side of the bus 2004. At the proper time, the “on” switches will turn off, and the subsequent phase switches will turn on, as shown above in FIGS. 4-10.
  • FIG. 26 illustrates an exemplary signal flow for the distributed control software of an exemplary embodiment. Remote modules 1820 located in the cab read the operator control elements 2620 (switches, accelerator potentiometer, direction select, park brake release, etc.). The appropriate remote modules 1820 located on the vehicle also read motor and generator temperature signals 2630. The remote modules 1820 convert data from these elements 2620 and signals 2630 converted into data that is given to the master module 1810 via the CAN bus 1805. The master 1810 then sends the various commands to the appropriate remote modules 1820 and drive modules 1830.
  • When the operator moves the engine select switch of the operator control elements 2620 to a high throttle position, the master module 1810 commands the engine 2001 to reach a predetermined operating speed. At the same time, 24 volts DC (battery voltage) is fed to the priming circuit, providing an initial current for the AC generator field 2012, and at the same time the VR SCR control 2011 turns on all the SCRs of an SCR bridge 2641 continuously.
  • As the AC generator 2002 voltage builds up to about 100 VAC, the VR converter 2011 begins controlled operation, ramping the generator voltage to its rated value. The ramping (typically about 3-4 seconds) provides a soft build up of bus voltage to limit the charging current of the bus capacitors. The priming function is then shut off and the VR 2011 has total regulation of the field excitation. As the load on the generator 2002 varies, the field 2012 current will adjust so that the proper voltage is maintained. The AC voltage may be limited as a function of the frequency of the generator 2002 so operation at lower engine rpm will maintain the generator at a proper volts/hertz level. This could occur if engine speed were slow to respond, or during shop mode and auxiliary power modes of operation. In an exemplary embodiment, the field excitation is regulated to maintain a voltage ratio of 8.6 volts per hertz below approximately 58 hertz. At 58 Hz, the voltage levels off at 500 VAC, which is maintained during the normal full power fluctuations of engine speed. Other embodiments may use different ramping, voltage ratios, frequencies, and VAC levels.
  • The distributed control system 1800 software operates on the basis of a “closed loop” system. In other words, a feedback is used to insure the response meets the command. When the operator depresses the accelerator pedal of the operator control element 2620, the vehicle is “commanded” to go a certain speed. This creates an overall speed command 2604 that will produce a common motor torque command 2608 to generate drive-specific torque commands 2609 to cause motor torque in the selected direction at the four traction wheel motors 1890. A small movement of the pedal initiates a small speed command 2604, resulting in a small change in torque command. A large movement will result in a high change in torque command. The common torque command 2608 actually is derived from the difference between the command speed and the actual speed. This difference is called an error 2606. As the vehicle approaches the commanded speed, the error 2606 decreases so the torque command 2608 will taper off. The actual speed achieved will be the commanded speed, less the error 2606 it takes to maintain the required torque. In an exemplary embodiment, the full pedal position represents 15 mph of vehicle speed. If the road surface is hard and level, almost 15 mph can be achieved because it takes only a small amount of torque to maintain it. If the vehicle is climbing a hill, is on under-footing having high rolling resistance, carrying heavy loads, or whatever condition may be present that requires higher torque, a lesser speed may be achieved. Other embodiments may have different full pedal speeds. The full pedal speed may be limited below actual vehicle capability for safety or other reasons.
  • The operator interface to the drive system is through sensors and switch inputs to remote modules 1820 and the data bus 2004. A direction select switch, accelerator pedal, park brake switch, engine select switch, etc. of operator controls 2620 are coupled to remote modules 1820 in the cab. In an exemplary embodiment, three cab remote modules 1820 are used. Data from the operator interface 2620 are passed as data to the master module 1810, and then, after performing the necessary calculation and control functions, the master module 1810 passes data to the drive modules 1860.
  • The master module 1810 creates all the control functions that allow the four drive modules 1860 and SR converters 1870 to work as an integrated system. As the operator works the accelerator pedal, the difference between the command speed 2604 and the actual speed creates a common torque command 2608 to all four drives, as described above. The four wheel speeds are averaged (2605) to obtain an overall vehicle speed which is used to null the common torque 2608 as commanded speed is reached. The common torque command 2608 is also modified to compensate for machine variables that require a reduction in torque. These may include programmed torque ramps and filters 2607, engine loading limits 2642, and temperature limits 2643 relating to the VR and generator. Other variables may be used. Individual limits relating to wheel slip and temperature constraints 2609 are directed to the individual drives.
  • When the machine is traveling at a given speed, and the accelerator is released, an error 2606 is created that says the machine is traveling faster than commanded. This error 2606 creates a braking torque to reduce the machine speed. With an SR motor system such as illustrated in FIG. 11, braking is substantially instantaneous because there are no currents to reduce or switch directions. Braking torque is achieved by simply changing the timing of the converter firing to following behind the rotor movement, “pulling it back” to reduce its speed. Conventional DC motor systems introduce a lag time because of the need to reduce or switch current directions.
  • The common torque command 2608 is then split into individual motor and drive torque commands 2609 for the four wheels. The individual commands 2609 take in system feedback parameters 2645 that relates to that particular drive. For instance, if one drive is indicating a motor or converter temperature that is climbing above safe values, that drive goes through a cutback, alarm and eventually a shutdown if the condition is not corrected.
  • The slip limit control 2610 is also fed to a particular offending drive. The four motor speeds are averaged in block 2605 and compared to each individual speed. If an individual speed goes beyond a prescribed limit, the command 2644 to that drive is reduced to prevent the wheel from going beyond that limit. This then controls the wheel slippage, enhancing tire life. The allowable limits are modified with steer angle and overall speed. The steer angle input 2646 gives the system information, so during a turn, the outside wheels are allowed to go faster than the inside. As the overall speed of the vehicle increases, slip control is relaxed to allow for wheel speed differences due to tire wear.
  • The local individual SR motor control logic 2612 is embedded in the drive module cards 1860. In one embodiment, this control 2612 relies on motor characteristics and limits that are programmed into the control code. These are originally done through a characterization of the motor 2613, where phase turn-on and turn-off time and angle are established for the full range of operating speeds and current levels. The sensor-less position information is also a part of the characterization process. With this information programmed into the drive module 1860, proper triggering of the IGBTs 2611 for the various speed and torque demands may be achieved.
  • The SR control logic 2612 also reads bus voltage to ensure it does not fluctuate beyond safe levels. As bus voltage rises, the chopper IGBT 2614 turns on to dump excess energy into the braking grids. In one embodiment, the chopper 2001 turns on when the bus voltage rises above 740 VDC, and off when it goes below 720 VDC. The length of the on versus off time determines the amount of energy dumped, and this is controlled directly as a function of bus voltage. In one embodiment, an over-voltage fault and a system shutdown occurs if bus voltage exceeds 800 VDC.
  • The SR control 2612 also monitors temperature and IGBT faults and reports them to the master 1810. Appropriate shutdowns are implemented for the various faults. One skilled in the art will recognize that other signal flows and control techniques may be used.
  • FIGS. 27 a-27 c are views of a phase ring 2700, corresponding to the phase ring 2110 of FIG. 21, for use in an embodiment of the stator 1718 to route wiring to the coil windings. As shown in FIGS. 27 a-27 c, a phase ring for a 12 stator pole, three phase stator 1718 is shown. Similar phase rings may be used for stators with different numbers of poles or phases, by changing the number of rings 2710 and tabs 2720 on the rings 2710.
  • FIG. 27 a provides a top view, a side view, and a section view around line A-A of an assembled phase ring 2700. Six phase ring sections 2710 a-2710 f each provide four tabs 2720 and a connector 2730. The tabs 2720 provide electrical connectivity with one lead 2410 of the four equally spaced stator coils 2450 for one of the three phases, while providing a single electrical external connector for a large wire to connect the SR motor to the power electronics. Rings 2710 a and 2710 b connect to the stator coils 2450 for a first phase, rings 2710 c and 2710 d connect to the stator coils 2450 for a second phase, and rings 2710 e and 2710 f connect to the stator coils 2450 for a third phase. In one embodiment, rings 2710 a, 2710 c, 2710 e are identical as manufactured, as are rings 2710 b, 2710 d, and 2710 f, each with three connectors 2730. During assembly, the appropriate two of the three connectors 2730 are removed from each ring 2710 to configure each ring 2710 for the desired phase of the SR motor.
  • For assembly, each ring 2710 is wrapped with insulation, such as an 80% lap mica mat tape, providing insulation between the rings 2710 when they are stacked as shown in FIG. 27 c, with ring separators 2740 providing additional separation and insulation between each ring 2710. The assembled phase ring assembly 2700 may then be again taped with insulation, such as a 60% lap glass tape, before placement into the stator to connect with the stator coils 2450.
  • FIG. 28 is a block diagram of an exemplary heavy-duty hoisting apparatus. Instead of a wheel, as in FIG. 11, the SR motor system of the apparatus 2800 of FIG. 28 drives a hoist 2810, such as a conventional winch, for lifting a load 2820. A distributed control system 1800 may be used to control the heavy-duty hoisting apparatus of FIG. 28. In some embodiments, an engine and generator such as described above may be used to power the SR motor system of FIG. 28. In other embodiments, the SR motor system may be connected to an external power source, such as a power grid.
  • The SR motor system of FIG. 28 may use the capability of stationary braking described above to avoid problems conventional hoisting apparatus have when lifting a load of an unknown weight. To avoid undesired vertical movement when moving a load 2820, the SR motor system may be locked in place by energizing less than all of the stator poles, then providing the correct torque to lift or lower the load 2820. In a conventional hoisting apparatus, unless sufficient torque is provided by the driving DC or AC motor, where the amount of torque needed may not be predeterminable because of an unknown weight of the load 2820, undesirable vertical movement may occur. Because the SR motor can be locked into a fixed rotational position as described above, this undesirable movement can be eliminated.
  • The foregoing disclosure and description of the invention are illustrative and explanatory thereof, and various changes in the details of the illustrated apparatus and construction and the method of operation may be made without departing from the spirit of the invention.

Claims (17)

  1. 1. A heavy-duty vehicle adapted for use in an industrial environment, comprising:
    a heavy-duty vehicle frame;
    a plurality of wheels mounted with the vehicle frame, each of the wheels adapted for engagement with a surface such as land;
    an engine mounted with the vehicle frame;
    an electrical generator operatively engaged with and driven by the engine;
    a first switched reluctance (SR) motor operably engaging a first wheel of the plurality of wheels, the first SR motor powered by the electrical generator;
    a digital control system coupled to the SR motor adapted to control the SR motor individually and to drive the vehicle,
    wherein the generator produces a DC voltage and the SR motor drives the first wheel concurrently.
  2. 2. The heavy-duty vehicle of claim 1, wherein the electrical generator is an alternating current (AC) generator.
  3. 3. The heavy-duty vehicle of claim 1, wherein the engine is a diesel engine.
  4. 4. The heavy-duty vehicle of claim 1, wherein the engine is adapted to run at a substantially constant predetermined RPM.
  5. 5. The heavy-duty vehicle of claim 1, further comprising:
    a heavy-duty materials handling system, mounted with the vehicle frame;
  6. 6. The heavy-duty vehicle of claim 5, wherein the digital control system is further adapted to control the materials handling system.
  7. 7. The heavy-duty vehicle of claim 5, the heavy-duty materials handling system comprising:
    a third SR motor, electrically coupled to the electrical generator; and
    a heavy-duty lifting apparatus, driven by the third SR motor.
  8. 8. The heavy-duty vehicle of claim 7, wherein the heavy-duty lifting apparatus is an apparatus for lifting a container.
  9. 9. The heavy-duty vehicle of claim 1, further comprising:
    an operator control system, adapted to provide a vehicle operator with operational control over the heavy-duty vehicle.
  10. 10. The heavy-duty vehicle of claim 1, the digital control system comprising:
    a master unit, adapted to receive commands from the operator control system;
    a drive remote unit, coupled to the first SR motor;
    a network, coupled to the master unit and the remote unit, adapted for message transmission between the master unit and the remote unit.
  11. 11. The heavy-duty vehicle of claim 10, further comprising:
    an AC to direct current (DC) power converter, coupled between the electrical generator and the first SR motor,
    wherein the drive remote unit is further coupled to the AC to DC power converter and to the network, and
    wherein the master unit is further adapted to control operating parameters of the AC to DC power converter via the drive remote unit.
  12. 12. The heavy-duty vehicle of claim 1, wherein the first SR motor is further adapted to control a second wheel of the plurality of wheels.
  13. 13. The heavy-duty vehicle of claim 1, further comprising:
    a second SR motor, operably engaging a second wheel of the plurality of wheels, the second SR motor powered by the electrical generator,
    wherein the digital control system is coupled to the first SR motor and the second SR motor for controlling operation of the first SR motor and the second SR motor individually, and for controlling operation of the first SR motor and the second SR motor together for driving the vehicle and for controlling the materials handling system.
  14. 14. The heavy-duty vehicle of claim 1, further comprising:
    a chopping system, adapted to dissipate excess DC voltage.
  15. 15. The heavy-duty vehicle of claim 1, further comprising:
    a power storage system, adapted to store excess DC voltage.
  16. 16. The heavy-duty vehicle of claim 1, further comprising:
    a power feedback system, adapted to drive the engine from excess electrical power fed back to the electrical generator.
  17. 17. The heavy-duty vehicle of claim 1, the first SR motor further adapted to provide braking for the first wheel.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090043460A1 (en) * 2007-08-09 2009-02-12 Caterpillar Inc. Wheel tractor scraper production optimization
WO2009128815A1 (en) 2008-04-14 2009-10-22 Deere & Company Traction control method and apparatus for a vehicle with independent drives
CN104846858A (en) * 2015-05-25 2015-08-19 安徽宏昌机电装备制造有限公司 Site-adaptive digger and loader

Families Citing this family (42)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7201244B2 (en) 2003-10-03 2007-04-10 Letourneau, Inc. Vehicle for materials handling and other industrial uses
US7398012B2 (en) * 2004-05-12 2008-07-08 Siemens Energy & Automation, Inc. Method for powering mining equipment
US7378808B2 (en) * 2004-05-25 2008-05-27 Caterpillar Inc. Electric drive system having DC bus voltage control
US7385372B2 (en) * 2004-05-27 2008-06-10 Siemens Energy & Automation, Inc. Auxiliary bus system
US20060019748A1 (en) * 2004-07-21 2006-01-26 Aruze Corp. Communication unit and sales management method of a gaming machine using the communication unit
US20060170389A1 (en) * 2005-01-31 2006-08-03 Caterpillar Inc Medium voltage switched reluctance motors used in traction applications
US7202625B2 (en) * 2005-02-25 2007-04-10 Caterpillar Inc Multi-motor switched reluctance traction system
DE102005037726A1 (en) * 2005-08-10 2007-02-15 Linde Ag Drive axle with an electric converter
US7945364B2 (en) * 2005-09-30 2011-05-17 Caterpillar Inc. Service for improving haulage efficiency
JP4736871B2 (en) * 2006-03-10 2011-07-27 株式会社日立製作所 Power converter system for a secondary excitation power system
DE102007020184A1 (en) * 2006-09-01 2008-03-13 Sew-Eurodrive Gmbh & Co. Kg Method and apparatus
US8244419B2 (en) * 2006-10-24 2012-08-14 Mi-Jack Canada, Inc. Marine power train system and method of storing energy in a marine vehicle
JP4755063B2 (en) * 2006-10-26 2011-08-24 三菱重工業株式会社 Electric vehicle, the slip control device and control method
DE102006062530B4 (en) * 2006-12-29 2016-06-23 Siegmund Kumeth Transport system for workpieces
US7600593B2 (en) * 2007-01-05 2009-10-13 Irobot Corporation Robotic vehicle with dynamic range actuators
US20090169007A1 (en) * 2007-12-31 2009-07-02 Clark Equipment Company Control Area Network Data Encryption System and Method
US7581341B1 (en) * 2008-05-23 2009-09-01 Reeves Jr James B Wheel loader
US8040113B2 (en) * 2009-01-27 2011-10-18 Astronics Advanced Electronic Systems Corp. Fault tolerant generator or starter/generator with low torque ripple
US8978801B2 (en) * 2009-07-27 2015-03-17 General Electric Company Hoist system and method
US8672069B2 (en) * 2009-08-25 2014-03-18 Deere & Company Hybrid vehicle with multiple electric drive systems
US8718881B2 (en) * 2009-09-11 2014-05-06 Tmeic Corporation Fuel efficient crane system
WO2011074045A1 (en) * 2009-12-18 2011-06-23 三菱電機株式会社 Electric vehicle drive control apparatus
US8525450B2 (en) * 2010-03-29 2013-09-03 Regal Beloit America, Inc. Power factor correction drive circuit topologies and control for switched reluctance machines
WO2012145635A3 (en) * 2011-04-20 2012-12-13 Johnson Kale R Hybrid sweeper-scrubber control method and system
US8773056B2 (en) * 2012-06-11 2014-07-08 Caterpillar Inc. FPDA closed loop electric drives controls
US8836256B2 (en) 2012-07-12 2014-09-16 Deere & Company Switched reluctance motor torque estimation
US9118225B2 (en) 2012-08-24 2015-08-25 Caterpillar Inc. Coil with twisted wires and stator assembly of a rotary electric machine
GB201219059D0 (en) * 2012-10-24 2012-12-05 Agco Int Gmbh Electric and hydraulic supply system for a vehicle
JP5902078B2 (en) * 2012-11-08 2016-04-13 本田技研工業株式会社 Electric vehicle
CN104442412B (en) * 2013-09-18 2018-01-19 通用电气公司 Device, a mobile transport equipment, electric tractors and electric forklifts and related methods
US9695896B2 (en) 2014-01-21 2017-07-04 Regal Beloit America, Inc. Drive and associated method
US10095646B2 (en) * 2014-04-29 2018-10-09 Harold Ray Bettencourt Device and method for allowing integration of incompatible devices into a vehicle bus network
US9382675B2 (en) * 2014-06-16 2016-07-05 Caterpillar Paving Products Inc. Electric powered systems for paving machines
US9780704B2 (en) * 2014-09-17 2017-10-03 Arm Limited Electrical motor system and method of operating the electrical motor system
US10056858B2 (en) 2014-09-17 2018-08-21 Arm Limited Motor driver and a method of operating thereof
US9419551B2 (en) 2014-09-17 2016-08-16 Arm Limited Motor driver and a method of operating thereof
JP2017225203A (en) * 2014-10-31 2017-12-21 Kaiseiモータ株式会社 Switched reluctance motor drive system
CN104787676B (en) * 2015-03-30 2017-03-08 樟树市至晟锻造有限公司 Lifting trolley
JP2017008741A (en) * 2015-06-17 2017-01-12 株式会社ミツバ Engine starter system
US9764633B1 (en) 2016-03-16 2017-09-19 Caterpillar Inc. Electric drivetrain system and method having a single speed ratio direct drive
RU2648660C1 (en) * 2017-01-30 2018-03-27 Общество с ограниченной ответственностью Научно-производственное предприятие "Резонанс" Self-propelled vehicle electromechanical transmission
RU2643903C1 (en) * 2017-04-05 2018-02-06 Общество с ограниченной ответственностью Научно-производственное предприятие "Резонанс" (ООО НПП "Резонанс") Self-propelled vehicle electromechanical transmission

Citations (57)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2726726A (en) * 1950-08-23 1955-12-13 Letourneau Inc Electric vehicle wheel
US2729298A (en) * 1950-09-11 1956-01-03 Letourneau Inc Wheel mounted motor and air-operated clutch with electrical control therefor
US2787331A (en) * 1949-08-22 1957-04-02 Robert G Letourneau Selectively reversible motor control for electrically driven tractor
US2913223A (en) * 1955-08-24 1959-11-17 Tourneau Robert G Le Electrically powered logging arch
US3093780A (en) * 1961-03-17 1963-06-11 Robert G Letourneau Electric motor control system
US3102219A (en) * 1962-01-22 1963-08-27 Robert G Letourneau Motor control system for electrically powered vehicles
US3417304A (en) * 1965-09-21 1968-12-17 Robert G. Letourneau Control system for electrically powered vehicles
US3953775A (en) * 1971-05-03 1976-04-27 R. G. Letourneau, Inc. Propulsion control system for electrically powered vehicles
US3967171A (en) * 1973-03-23 1976-06-29 R. G. Letourneau, Inc. Propulsion control system for electrically powered vehicles
US3974429A (en) * 1973-03-23 1976-08-10 R. G. Letourneau, Inc. Propulsion control system for electrically powered vehicles
US4348619A (en) * 1978-05-26 1982-09-07 Chloride Group Limited Variable reluctance electric motor systems
US4360770A (en) * 1978-05-26 1982-11-23 Chloride Group Public Limited Company Variable reluctance motor systems
US4387326A (en) * 1978-05-26 1983-06-07 Chloride Group Limited Variable reluctance motor systems
US4563619A (en) * 1981-09-08 1986-01-07 Chloride Group Public Limited Company Electric power converter circuit
US4698537A (en) * 1985-01-15 1987-10-06 Kollmorgen Technologies Corporation Electrical drive systems incorporating variable reluctance motors
US4943760A (en) * 1984-10-19 1990-07-24 Kollmorgen Corporation Control systems for variable reluctance electrical machines
US5043618A (en) * 1988-05-27 1991-08-27 Switched Reluctance Drives Ltd. Electric machines
US5072166A (en) * 1990-06-18 1991-12-10 The Texas A&M University System Position sensor elimination technique for the switched reluctance motor drive
US5103923A (en) * 1989-11-30 1992-04-14 Marathon Letourneau Company Method and apparatus for propelling and retarding off-road haulers
US5283507A (en) * 1990-12-20 1994-02-01 General Electric Company Regenerative braking protection for an electrically-propelled traction vehicle
US5291115A (en) * 1992-09-25 1994-03-01 The Texas A&M University System Method and apparatus for sensing the rotor position of a switched reluctance motor without a shaft position sensor
US5449993A (en) * 1994-06-07 1995-09-12 Switched Reluctance Drivers Limited Regenerative ac to dc converter
US5467025A (en) * 1992-06-03 1995-11-14 Switched Reluctance Drives Limited Sensorless rotor position measurement in electric machines
US5469039A (en) * 1991-09-25 1995-11-21 Switched Reluctance Drives Limited Control of switched reluctance machines
US5504410A (en) * 1993-01-14 1996-04-02 Switched Reluctance Drives Limited Switching circuit
US5530333A (en) * 1993-07-20 1996-06-25 Switched Reluctance Drives Limited Control of an inductive load
US5539293A (en) * 1993-06-07 1996-07-23 Switched Reluctance Drives Limited Rotor position encoder having features in decodable angular positions
US5545964A (en) * 1992-09-24 1996-08-13 Switched Reluctance Drives Ltd. Control of switched reluctance machines
US5548173A (en) * 1992-12-10 1996-08-20 Switched Reluctance Drives Limited Switched reluctance motors
US5563487A (en) * 1994-04-22 1996-10-08 Switched Reluctance Drives, Ltd. Control circuit for an inductive load
US5627445A (en) * 1995-05-10 1997-05-06 Switched Reluctance Drives, Ltd. Sensing phase current in switched reluctance machines
US5650682A (en) * 1995-03-29 1997-07-22 Switched Reluctance Drives, Ltd. Single-phase variable reluctance motor having permanent magnets embedded within a phase winding
US5650799A (en) * 1994-04-15 1997-07-22 Canon Kabushiki Kaisha Programmable function keys for a networked imaging computer system
US5652494A (en) * 1995-03-28 1997-07-29 Switched Reluctance Drives, Ltd. Angle controller for a switched reluctance drive utilizing a high frequency clock
US5654601A (en) * 1995-03-28 1997-08-05 Switched Reluctance Drives, Ltd. Switched reluctance machine
US5674008A (en) * 1995-03-22 1997-10-07 Switched Reluctance Drives, Ltd. Pulsed temperature monitoring circuit and method
US5703457A (en) * 1994-07-13 1997-12-30 Switched Reluctance Drives, Ltd. Power supply to a stator of a polyphase reluctance machine
US5705918A (en) * 1994-08-31 1998-01-06 Switched Reluctance Drives, Ltd. Switched reluctance generators
US5724477A (en) * 1995-04-20 1998-03-03 Switched Reluctance Drives, Ltd. Compensation for input voltage variation in an electric motor drive
US5723858A (en) * 1995-03-28 1998-03-03 Switched Reluctance Drives, Ltd. Position encoder with fault indicator
US5726516A (en) * 1995-04-07 1998-03-10 Switched Reluctance Drives, Ltd. Rotor for high speed switched reluctance machine
US5736828A (en) * 1994-07-12 1998-04-07 Switched Reluctance Drives, Ltd. Electric machine controller
US5739615A (en) * 1995-07-24 1998-04-14 Switched Reluctance Drives Limited Rotor for reluctance machine
US5739663A (en) * 1995-11-14 1998-04-14 Switched Reluctance Drives Limited Phase energization controller and method for controlling switched reluctance machines using simple angular position sensors with improved angle interpolation
US5747962A (en) * 1995-03-21 1998-05-05 Switched Reluctance Drives Limited Method and apparatus for increasing the starting torque of a two-phase switched reluctance motor
US5753984A (en) * 1995-03-29 1998-05-19 Switched Reluctance Drives Limited Apparatus and method for starting a single-phase variable reluctance motor
US6487998B1 (en) * 1995-08-31 2002-12-03 Isad Electronic Systems Gmbh & Co., Kg Drive system, particularly for a motor vehicle, and process for operating it
US6608396B2 (en) * 2001-12-06 2003-08-19 General Motors Corporation Electrical motor power management system
US6616569B2 (en) * 2001-06-04 2003-09-09 General Motors Corporation Torque control system for a hybrid vehicle with an automatic transmission
US6653817B2 (en) * 2001-06-26 2003-11-25 General Motors Corporation State-of-charge detection device for a battery
US6717281B1 (en) * 2000-10-26 2004-04-06 Dennis Brandon Electric generator and motor drive system
US7178618B2 (en) * 2001-11-29 2007-02-20 Toyota Jidosha Kabushiki Kaisha Vehicular control apparatus and method
US7195087B2 (en) * 2003-04-09 2007-03-27 Nissan Motor Co., Ltd. Drive apparatus for vehicle
US7202625B2 (en) * 2005-02-25 2007-04-10 Caterpillar Inc Multi-motor switched reluctance traction system
US7298102B2 (en) * 2004-05-25 2007-11-20 Caterpillar Inc Electric drive system having DC bus voltage control
US7324902B2 (en) * 2003-02-18 2008-01-29 General Motors Corporation Method and apparatus for generalized recursive least-squares process for battery state of charge and state of health
US7389837B2 (en) * 2003-10-20 2008-06-24 General Motors Corporation Electric power control system for a hybrid vehicle

Family Cites Families (58)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8919024D0 (en) 1989-08-21 1989-10-04 Switched Reluctance Drives Ltd Improvements in electric reluctance machines
EP0609800A1 (en) 1993-02-01 1994-08-10 Licentia Patent-Verwaltungs-GmbH Switched reluctance motor as traction motor for electric drive vehicle
GB9418710D0 (en) 1994-09-16 1994-11-02 Switched Reluctance Drives Ltd Stator for electric machine and lamination thereof
GB9506975D0 (en) 1995-04-04 1995-05-24 Switched Reluctance Drives Ltd Controller for a switched reluctance machine
GB9507391D0 (en) 1995-04-10 1995-05-31 Switched Reluctance Drives Ltd Method and apparatus for reducing winding failures in switched reluctance machines
GB2299899B (en) 1995-04-10 1999-11-24 Switched Reluctance Drives Ltd Method and apparatus for reducing voltage stress in switched reluctance machines
GB9507540D0 (en) 1995-04-11 1995-05-31 Switched Reluctance Drives Ltd Control circuit and system for a switched reluctance machine and method of operating
GB9513916D0 (en) 1995-07-07 1995-09-06 Switched Reluctance Drives Ltd Switching circuit for an inductive load
DE69610270T2 (en) 1995-07-25 2001-02-22 Switched Reluctance Drives Ltd Control of a switched reluctance machine
GB2305022B (en) 1995-09-05 2000-04-26 Switched Reluctance Drives Ltd Starting a single-phase reluctance motor
GB9518837D0 (en) 1995-09-14 1995-11-15 Switched Reluctance Drives Ltd Reduced noise controller for a switched reluctance machine
GB9518806D0 (en) 1995-09-14 1995-11-15 Switched Reluctance Drives Ltd Reduced noise controller for a switched reluctance machine using active noise cancellation
GB9524022D0 (en) 1995-11-23 1996-01-24 Barnes N M Method of operating an electronic circuit
GB9524893D0 (en) 1995-12-05 1996-02-07 Switched Reluctance Drives Ltd Method and apparatus for producing iron losses in a switched reluctance machine
GB9525408D0 (en) 1995-12-07 1996-02-14 Switched Reluctance Drives Ltd Rotor for a reluctance machine
GB9525952D0 (en) 1995-12-19 1996-02-21 Switched Reluctance Drives Ltd Sensorless rotor position monitoring in reluctance machines
GB9601753D0 (en) 1996-01-29 1996-03-27 Switched Reluctance Drives Ltd Dual mode position control systems with speed profiling
GB2310544B (en) 1996-02-21 2000-03-29 Switched Reluctance Drives Ltd Method of forming a rotor for a reluctance machine
GB2311170B (en) 1996-03-13 2000-07-12 Switched Reluctance Drives Ltd Winding retention on an electrical machine
GB2311423B (en) 1996-03-19 2000-05-10 Switched Reluctance Drives Ltd An electrical machine drive system including an optical position transducer circuit
GB9607229D0 (en) 1996-04-04 1996-06-12 Switched Reluctance Drives Ltd Analogue to digital converter
GB9607688D0 (en) 1996-04-12 1996-06-12 Switched Reluctance Drives Ltd Current shaping in reluctance machines
GB9608215D0 (en) 1996-04-19 1996-06-26 Switched Reluctance Drives Ltd Weaving apparatus
GB9608216D0 (en) 1996-04-19 1996-06-26 Switched Reluctance Drives Ltd Converter circuit for a polyphase switched inductive load
GB9608832D0 (en) 1996-04-30 1996-07-03 Switched Reluctance Drives Ltd Power factor correction circuit
GB9608819D0 (en) 1996-04-30 1996-07-03 Switched Reluctance Drives Ltd Demodulator for a pulse width modulated signal
GB9610846D0 (en) 1996-05-23 1996-07-31 Switched Reluctance Drives Ltd Output smoothing in a switched reluctance machine
GB9613538D0 (en) 1996-06-27 1996-08-28 Switched Reluctance Drives Ltd Matrix interpolation
GB9623865D0 (en) 1996-11-15 1997-01-08 Switched Reluctance Drives Ltd An electric machine
US5731649A (en) * 1996-12-27 1998-03-24 Caama+E,Otl N+Ee O; Ramon A. Electric motor or generator
US5982070A (en) * 1996-12-27 1999-11-09 Light Engineering Corporation Electric motor or generator having amorphous core pieces being individually accomodated in a dielectric housing
GB9711630D0 (en) 1997-06-05 1997-07-30 Switched Reluctance Drives Ltd Off-time current controller
US6148941A (en) * 1998-04-30 2000-11-21 Caterpillar Inc. Wheel assembly for a ground-driven work machine and method for assembling the same
US6445960B1 (en) * 1998-05-29 2002-09-03 Ronbotics Corporation Electric motion platform and a control system for controlling the same
US6731083B2 (en) * 1998-06-02 2004-05-04 Switched Reluctance Drives, Ltd. Flux feedback control system
DE19832876C1 (en) 1998-07-22 1999-10-21 Daimler Chrysler Ag Electrical reluctance machine control method e.g. for electric vehicle drive
US6331365B1 (en) 1998-11-12 2001-12-18 General Electric Company Traction motor drive system
JP2000245005A (en) 1999-02-18 2000-09-08 Toshiba Corp Drive controller for rolling stock
US6288460B1 (en) 1999-11-03 2001-09-11 Baldor Electric Company Fluid-cooled, high power switched reluctance motor
EP1158652B1 (en) 2000-05-24 2007-09-26 Matsushita Electric Industrial Co., Ltd. Motor, electric vehicle and hybrid electric vehicle
US6648483B1 (en) * 2000-07-07 2003-11-18 Umax Data Systems, Inc. Concave mirror optical system for scanner
JP2002171778A (en) * 2000-09-25 2002-06-14 Aisin Seiki Co Ltd Device for suppressing and controlling vibrations of electric motor and designing technique in suppression and control of the vibrations of the electric motor
US6757597B2 (en) 2001-01-31 2004-06-29 Oshkosh Truck A/C bus assembly for electronic traction vehicle
JP2002281784A (en) * 2001-03-19 2002-09-27 Aisin Seiki Co Ltd Motor driver and controller
US6588538B2 (en) * 2001-07-12 2003-07-08 Caterpillar Inc. Wheel and final drive assembly for a ground driven work machine
JP2003033065A (en) * 2001-07-19 2003-01-31 Aisin Seiki Co Ltd Controller for electric motor and its design method
US6684483B2 (en) 2001-09-14 2004-02-03 General Motors Corporation Method of fabricating a rotor for an electric traction motor
US6470696B1 (en) 2001-09-18 2002-10-29 Valerie Palfy Devices and methods for sensing condensation conditions and for removing condensation from surfaces
DE10156269A1 (en) 2001-11-16 2003-06-05 Siemens Ag Traction drive for electrical railway locomotives, has at least one synchronous reluctance motor; electrical railway locomotive is implemented as cargo locomotive
US6603237B1 (en) * 2002-01-30 2003-08-05 Ramon A. Caamano High frequency electric motor or generator including magnetic cores formed from thin film soft magnetic material
US6879080B2 (en) * 2002-01-30 2005-04-12 Ramon A. Caamano High frequency electric motor or generator including magnetic cores formed from thin film soft magnetic material
US6703746B2 (en) 2002-03-01 2004-03-09 General Motors Corporation Interior permanent magnet rotor
US6883959B2 (en) * 2002-12-23 2005-04-26 Premark Feg L.L.C. Power bowl lift, motor mount and tensioner for mixing machine
US6880654B2 (en) * 2003-03-28 2005-04-19 Paul J. Plishner Vehicle with a distributed motor
US7201244B2 (en) 2003-10-03 2007-04-10 Letourneau, Inc. Vehicle for materials handling and other industrial uses
US6864658B1 (en) * 2003-10-03 2005-03-08 Advanced Energy Conversion, Llc Closed loop control of excitation parameters for switch-reluctance motors
US6986727B2 (en) * 2003-12-23 2006-01-17 Caterpillar Inc. Retarding control for an electric drive machine
US20060170389A1 (en) 2005-01-31 2006-08-03 Caterpillar Inc Medium voltage switched reluctance motors used in traction applications

Patent Citations (64)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2787331A (en) * 1949-08-22 1957-04-02 Robert G Letourneau Selectively reversible motor control for electrically driven tractor
US2726726A (en) * 1950-08-23 1955-12-13 Letourneau Inc Electric vehicle wheel
US2729298A (en) * 1950-09-11 1956-01-03 Letourneau Inc Wheel mounted motor and air-operated clutch with electrical control therefor
US2913223A (en) * 1955-08-24 1959-11-17 Tourneau Robert G Le Electrically powered logging arch
US3093780A (en) * 1961-03-17 1963-06-11 Robert G Letourneau Electric motor control system
US3102219A (en) * 1962-01-22 1963-08-27 Robert G Letourneau Motor control system for electrically powered vehicles
US3417304A (en) * 1965-09-21 1968-12-17 Robert G. Letourneau Control system for electrically powered vehicles
US3953775A (en) * 1971-05-03 1976-04-27 R. G. Letourneau, Inc. Propulsion control system for electrically powered vehicles
US3974429A (en) * 1973-03-23 1976-08-10 R. G. Letourneau, Inc. Propulsion control system for electrically powered vehicles
US3967171A (en) * 1973-03-23 1976-06-29 R. G. Letourneau, Inc. Propulsion control system for electrically powered vehicles
US4387326A (en) * 1978-05-26 1983-06-07 Chloride Group Limited Variable reluctance motor systems
US4360770A (en) * 1978-05-26 1982-11-23 Chloride Group Public Limited Company Variable reluctance motor systems
US4348619A (en) * 1978-05-26 1982-09-07 Chloride Group Limited Variable reluctance electric motor systems
US4563619A (en) * 1981-09-08 1986-01-07 Chloride Group Public Limited Company Electric power converter circuit
US4943760A (en) * 1984-10-19 1990-07-24 Kollmorgen Corporation Control systems for variable reluctance electrical machines
US4698537A (en) * 1985-01-15 1987-10-06 Kollmorgen Technologies Corporation Electrical drive systems incorporating variable reluctance motors
US5043618A (en) * 1988-05-27 1991-08-27 Switched Reluctance Drives Ltd. Electric machines
US5103923A (en) * 1989-11-30 1992-04-14 Marathon Letourneau Company Method and apparatus for propelling and retarding off-road haulers
US5351775A (en) * 1989-11-30 1994-10-04 Marathon Letourneau Company Method for propelling and retarding off-road haulers
US5072166A (en) * 1990-06-18 1991-12-10 The Texas A&M University System Position sensor elimination technique for the switched reluctance motor drive
US5283507A (en) * 1990-12-20 1994-02-01 General Electric Company Regenerative braking protection for an electrically-propelled traction vehicle
US5469039A (en) * 1991-09-25 1995-11-21 Switched Reluctance Drives Limited Control of switched reluctance machines
US5467025A (en) * 1992-06-03 1995-11-14 Switched Reluctance Drives Limited Sensorless rotor position measurement in electric machines
US5545964A (en) * 1992-09-24 1996-08-13 Switched Reluctance Drives Ltd. Control of switched reluctance machines
US5563488A (en) * 1992-09-24 1996-10-08 Switched Reluctance Drives Limited Control of switched reluctance machines
US5291115A (en) * 1992-09-25 1994-03-01 The Texas A&M University System Method and apparatus for sensing the rotor position of a switched reluctance motor without a shaft position sensor
US5410235A (en) * 1992-09-25 1995-04-25 The Texas A&M University System Method and apparatus for sensing the rotor position of a switched reluctance motor
US5548173A (en) * 1992-12-10 1996-08-20 Switched Reluctance Drives Limited Switched reluctance motors
US5504410A (en) * 1993-01-14 1996-04-02 Switched Reluctance Drives Limited Switching circuit
US5539293A (en) * 1993-06-07 1996-07-23 Switched Reluctance Drives Limited Rotor position encoder having features in decodable angular positions
US5637972A (en) * 1993-06-07 1997-06-10 Switched Reluctance Drives, Ltd. Rotor position encoder having features in decodeable angular positions
US5530333A (en) * 1993-07-20 1996-06-25 Switched Reluctance Drives Limited Control of an inductive load
US5650799A (en) * 1994-04-15 1997-07-22 Canon Kabushiki Kaisha Programmable function keys for a networked imaging computer system
US5563487A (en) * 1994-04-22 1996-10-08 Switched Reluctance Drives, Ltd. Control circuit for an inductive load
US5449993A (en) * 1994-06-07 1995-09-12 Switched Reluctance Drivers Limited Regenerative ac to dc converter
US5736828A (en) * 1994-07-12 1998-04-07 Switched Reluctance Drives, Ltd. Electric machine controller
US5703457A (en) * 1994-07-13 1997-12-30 Switched Reluctance Drives, Ltd. Power supply to a stator of a polyphase reluctance machine
US5705918A (en) * 1994-08-31 1998-01-06 Switched Reluctance Drives, Ltd. Switched reluctance generators
US5747962A (en) * 1995-03-21 1998-05-05 Switched Reluctance Drives Limited Method and apparatus for increasing the starting torque of a two-phase switched reluctance motor
US5674008A (en) * 1995-03-22 1997-10-07 Switched Reluctance Drives, Ltd. Pulsed temperature monitoring circuit and method
US5652494A (en) * 1995-03-28 1997-07-29 Switched Reluctance Drives, Ltd. Angle controller for a switched reluctance drive utilizing a high frequency clock
US5654601A (en) * 1995-03-28 1997-08-05 Switched Reluctance Drives, Ltd. Switched reluctance machine
US5723858A (en) * 1995-03-28 1998-03-03 Switched Reluctance Drives, Ltd. Position encoder with fault indicator
US5753984A (en) * 1995-03-29 1998-05-19 Switched Reluctance Drives Limited Apparatus and method for starting a single-phase variable reluctance motor
US5650682A (en) * 1995-03-29 1997-07-22 Switched Reluctance Drives, Ltd. Single-phase variable reluctance motor having permanent magnets embedded within a phase winding
US5726516A (en) * 1995-04-07 1998-03-10 Switched Reluctance Drives, Ltd. Rotor for high speed switched reluctance machine
US5724477A (en) * 1995-04-20 1998-03-03 Switched Reluctance Drives, Ltd. Compensation for input voltage variation in an electric motor drive
US5627445A (en) * 1995-05-10 1997-05-06 Switched Reluctance Drives, Ltd. Sensing phase current in switched reluctance machines
US5739615A (en) * 1995-07-24 1998-04-14 Switched Reluctance Drives Limited Rotor for reluctance machine
US6487998B1 (en) * 1995-08-31 2002-12-03 Isad Electronic Systems Gmbh & Co., Kg Drive system, particularly for a motor vehicle, and process for operating it
US5739663A (en) * 1995-11-14 1998-04-14 Switched Reluctance Drives Limited Phase energization controller and method for controlling switched reluctance machines using simple angular position sensors with improved angle interpolation
US6717281B1 (en) * 2000-10-26 2004-04-06 Dennis Brandon Electric generator and motor drive system
US6856035B2 (en) * 2000-10-26 2005-02-15 Dennis Brandon Electric generator and motor drive system
US6616569B2 (en) * 2001-06-04 2003-09-09 General Motors Corporation Torque control system for a hybrid vehicle with an automatic transmission
US6653817B2 (en) * 2001-06-26 2003-11-25 General Motors Corporation State-of-charge detection device for a battery
US7178618B2 (en) * 2001-11-29 2007-02-20 Toyota Jidosha Kabushiki Kaisha Vehicular control apparatus and method
US6608396B2 (en) * 2001-12-06 2003-08-19 General Motors Corporation Electrical motor power management system
US7324902B2 (en) * 2003-02-18 2008-01-29 General Motors Corporation Method and apparatus for generalized recursive least-squares process for battery state of charge and state of health
US7373264B2 (en) * 2003-02-18 2008-05-13 General Motors Corporation Method and apparatus for generalized recursive least-squares process for battery state of charge and state of health
US7195087B2 (en) * 2003-04-09 2007-03-27 Nissan Motor Co., Ltd. Drive apparatus for vehicle
US7389837B2 (en) * 2003-10-20 2008-06-24 General Motors Corporation Electric power control system for a hybrid vehicle
US7298102B2 (en) * 2004-05-25 2007-11-20 Caterpillar Inc Electric drive system having DC bus voltage control
US7378808B2 (en) * 2004-05-25 2008-05-27 Caterpillar Inc. Electric drive system having DC bus voltage control
US7202625B2 (en) * 2005-02-25 2007-04-10 Caterpillar Inc Multi-motor switched reluctance traction system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090043460A1 (en) * 2007-08-09 2009-02-12 Caterpillar Inc. Wheel tractor scraper production optimization
US8229631B2 (en) * 2007-08-09 2012-07-24 Caterpillar Inc. Wheel tractor scraper production optimization
WO2009128815A1 (en) 2008-04-14 2009-10-22 Deere & Company Traction control method and apparatus for a vehicle with independent drives
CN104846858A (en) * 2015-05-25 2015-08-19 安徽宏昌机电装备制造有限公司 Site-adaptive digger and loader

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US20050072608A1 (en) 2005-04-07 application
US7318580B2 (en) 2008-01-15 grant
US7201244B2 (en) 2007-04-10 grant
US20070272904A1 (en) 2007-11-29 application

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