GB2340678A - Drive system for battery powered vehicles - Google Patents

Drive system for battery powered vehicles Download PDF

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Publication number
GB2340678A
GB2340678A GB9914097A GB9914097A GB2340678A GB 2340678 A GB2340678 A GB 2340678A GB 9914097 A GB9914097 A GB 9914097A GB 9914097 A GB9914097 A GB 9914097A GB 2340678 A GB2340678 A GB 2340678A
Authority
GB
United Kingdom
Prior art keywords
battery
drive system
motor
boost circuit
battery powered
Prior art date
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.)
Granted
Application number
GB9914097A
Other versions
GB2340678B (en
GB9914097D0 (en
Inventor
Geoffrey William Purdy
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Oldham Crompton Batteries Ltd
Original Assignee
Oldham Crompton Batteries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Oldham Crompton Batteries Ltd filed Critical Oldham Crompton Batteries Ltd
Publication of GB9914097D0 publication Critical patent/GB9914097D0/en
Publication of GB2340678A publication Critical patent/GB2340678A/en
Application granted granted Critical
Publication of GB2340678B publication Critical patent/GB2340678B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075—Constructional features or details
    • B66F9/20—Means for actuating or controlling masts, platforms, or forks
    • B66F9/24—Electrical devices or systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L15/00—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
    • B60L15/20—Methods, 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/20—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by converters located in the vehicle
    • B60L53/22—Constructional details or arrangements of charging converters specially adapted for charging electric vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2200/00—Type of vehicles
    • B60L2200/40—Working vehicles
    • B60L2200/42—Fork lift trucks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2210/00—Converter types
    • B60L2210/10—DC to DC converters
    • B60L2210/14—Boost converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J2207/20—Charging or discharging characterised by the power electronics converter
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/72—Electric energy management in electromobility
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/14—Plug-in electric vehicles

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

A drive system for a battery powered vehicle comprising an AC or DC motor comprises a rechargeable battery 35 and a voltage boost circuit for enabling the motor to be provided with power at a voltage greater than that of the battery and for enabling the speed of the motor to be controlled, the boost circuit comprising contactors 30-32 simultaneously movable to lie either at a first position when the battery is discharging to the motor, or at a second position when the battery is being recharged. The boost circuit includes an inductor T1 that has a second winding providing a rectified output for charging the battery 35. May be used in the battery powered vehicle such as a fork lift truck.

Description

2340678 DRIVE SYSTEM FOR BATTERY POWERED VEHICLES This invention relates
to a drive system for a battery powered vehicle such as, for example, a fork lift truck, and has for its object to provide such a system in a simple and convenient form.
One proposal for a system for a battery powered vehicle has been described and claimed in our pending UK Patent Application No. 9809802.3. Appendix A (5 pages of text, 2 pages of drawings) hereto sets forth a copy of the description, claims, and drawings of the specification of said application, and the details of said specification are thereby incorporated into this application.
By the present invention it is taught that the voltage boost facility of the aforedescribed type of system can be adapted to permit recharge of the battery. Th.is is achieved by the provision of three contactors in the boost circuit. An example of an embodiment of this aspect of the invention is shown by the Figure 5 drawing of appendix B, wherein the drive system 40 comprises three simultaneously operated contactors 30,31, 32 are closed when the battery is on discharge, and opened when a three phase supply is connected across the points A and B. As further illustrated in appendix B, a boost inductor T1 has a second winding 33 which in discharge is not used. When the three phase supply 34 is connected to recharge the battery 35, the contactors 30,31,32 open and the secondary of the inductor acts as a secondary of a transformer such that the output is then rectified for charging the battery.
In use of the drive systems to which reference has hereinbefore been made, and as applied to the control of a DC type motor, the speed of the motor may be varied in known manner by varying the magnitude of the increase of DC voltage. There thereby results a cost effective means of providing DC motors for small electric vehicles. In particular, by employing a DC boost converter to raise the voltage supply from a battery, it is possible to use conventional higher voltage DC motors that can readily be made at relatively low cost with windings formed on conventional automated equipment.
Typically the boost converter may be employed to vary the speed of the motor by varying the "on" time of the boost circuit. An example is that of an 80 2 volt battery which can be employed to feed a 500 volt DC motor with a variable voltage ranging between 80 and 500 volts. This enables the motor to start from rest and increase in speed as the vehicle or ddve motor accelerates.
In another example, a single stage boost may be employed to operate a 100 volt motor from a 12 cell battery with a 4:1 range to provide speed control. That is, the supply voltage to the motor can range from 24 to 100 volts, this being generally sufficient for the motor to start from rest and slowly speed up to full output.
If a two stage boost is employed, a voltage range of 80 to 500 volts (e g a ratio of 6:1 or 8:1) typically may be achieved and is particularly potentially suitable for the drive system of a road type electric vehicle.
3

Claims (11)

CLAIMS:
1 A drive system for a battery powered vehicle comprising an AC or DC motor, said system comprising a rechargeable battery, a voltage boost circuit for enabling the motor to be provided with power at a voltage greater than that of the battery and for enabling the speed of the motor to be controlled, said boost circuit comprising contactors simultaneously movable to fie either at a first position when the battery is discharging to the motor, or at a second position when the battery is being recharged.
2 A drive system according to Claim 1 wherein the contactors are movable to said second position for allowing the battery to be recharged from an external power supply.
3 A drive system according to Claim 1 wherein said external supply is a three phase supply.
4 A drive system according to any one of the preceding Claims wherein the boost circuit comprise an inductor.
A drive system according to Claim 4 wherein said inductor comprises a secondary winding which is used only during recharge of the battery.
6 A drive system according to Claim 5 wherein movement of the contactors to said second position connects the secondary winding to facilitate rectification of an external AC power supply for charging the battery.
7 A drive system according to any one of the preceding Claims wherein the boost converter varies the speed of the motor by varying the on time of the boost circuit.
8 A drive system according to any one of the preceding Claims and comprising a single stage boost circuit.
9 A drive system according to any one of Claims 1-7 and comprising a multi stage boost circuit.
A drive system according to Claim 1 and substantially as hereinbefore described.
11 A battery powered vehicle comprising a drive system according to any one of the preceding Claims.
4 12 A battery powered vehicle according to Claim 11 wherein the battery supply is used to drive a motor for movement of the vehicle over a ground surface and to cause at least upward movement of support means for lifting loads.
GB9914097A 1998-06-17 1999-06-17 Drive system for battery powered vehicles Expired - Fee Related GB2340678B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GBGB9813043.8A GB9813043D0 (en) 1998-06-17 1998-06-17 Drive system for battery powered vehicles

Publications (3)

Publication Number Publication Date
GB9914097D0 GB9914097D0 (en) 1999-08-18
GB2340678A true GB2340678A (en) 2000-02-23
GB2340678B GB2340678B (en) 2001-04-18

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GBGB9813043.8A Ceased GB9813043D0 (en) 1998-06-17 1998-06-17 Drive system for battery powered vehicles
GB9914097A Expired - Fee Related GB2340678B (en) 1998-06-17 1999-06-17 Drive system for battery powered vehicles

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GBGB9813043.8A Ceased GB9813043D0 (en) 1998-06-17 1998-06-17 Drive system for battery powered vehicles

Country Status (1)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006132052A2 (en) * 2005-06-07 2006-12-14 Toyota Jidosha Kabushiki Kaisha Vehicular power supply system and vehicle
WO2009125063A1 (en) * 2008-04-09 2009-10-15 Rocla Oyj Electrical system for a forklift
US7649335B2 (en) 2005-06-07 2010-01-19 Toyota Jidosha Kabushiki Kaisha Vehicular power supply system and vehicle

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1527277A (en) * 1975-10-13 1978-10-04 Tokyo Shibaura Electric Co Electric power converting apparatus for use in battery cars
GB2018060A (en) * 1978-03-29 1979-10-10 Citroen Sa Circuit for simulating the operation of a battery in particular a traction battery for an electric vehicle
GB1599691A (en) * 1978-05-26 1981-10-07 Chloride Group Ltd Battery propelled vehicles
GB1604066A (en) * 1978-05-26 1981-12-02 Chloride Group Ltd Battery charges in variable reluctance electric motor systems
GB2093285A (en) * 1981-02-12 1982-08-25 Chloride Group Ltd Battery Charger/Controller
US5283513A (en) * 1991-05-08 1994-02-01 Honda Giken Kogyo Kabushiki Kaisha Battery charging device for electric vehicles

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1527277A (en) * 1975-10-13 1978-10-04 Tokyo Shibaura Electric Co Electric power converting apparatus for use in battery cars
GB2018060A (en) * 1978-03-29 1979-10-10 Citroen Sa Circuit for simulating the operation of a battery in particular a traction battery for an electric vehicle
GB1599691A (en) * 1978-05-26 1981-10-07 Chloride Group Ltd Battery propelled vehicles
GB1604066A (en) * 1978-05-26 1981-12-02 Chloride Group Ltd Battery charges in variable reluctance electric motor systems
GB2093285A (en) * 1981-02-12 1982-08-25 Chloride Group Ltd Battery Charger/Controller
US5283513A (en) * 1991-05-08 1994-02-01 Honda Giken Kogyo Kabushiki Kaisha Battery charging device for electric vehicles

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006132052A2 (en) * 2005-06-07 2006-12-14 Toyota Jidosha Kabushiki Kaisha Vehicular power supply system and vehicle
JP2006345606A (en) * 2005-06-07 2006-12-21 Toyota Motor Corp Power system for vehicle, and vehicle
WO2006132052A3 (en) * 2005-06-07 2007-04-26 Toyota Motor Co Ltd Vehicular power supply system and vehicle
US7649335B2 (en) 2005-06-07 2010-01-19 Toyota Jidosha Kabushiki Kaisha Vehicular power supply system and vehicle
JP4506571B2 (en) * 2005-06-07 2010-07-21 トヨタ自動車株式会社 Vehicle power supply system and vehicle
CN101194406B (en) * 2005-06-07 2012-06-27 丰田自动车株式会社 Vehicular power supply system and vehicle
WO2009125063A1 (en) * 2008-04-09 2009-10-15 Rocla Oyj Electrical system for a forklift

Also Published As

Publication number Publication date
GB9813043D0 (en) 1998-08-12
GB2340678B (en) 2001-04-18
GB9914097D0 (en) 1999-08-18

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20110617